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WO2006106676A1 - Appareil d'emission et appareil de reception - Google Patents

Appareil d'emission et appareil de reception Download PDF

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Publication number
WO2006106676A1
WO2006106676A1 PCT/JP2006/306302 JP2006306302W WO2006106676A1 WO 2006106676 A1 WO2006106676 A1 WO 2006106676A1 JP 2006306302 W JP2006306302 W JP 2006306302W WO 2006106676 A1 WO2006106676 A1 WO 2006106676A1
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WO
WIPO (PCT)
Prior art keywords
packet
signal
single carrier
unit
transmitted
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2006/306302
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English (en)
Japanese (ja)
Inventor
Mamoru Sawahashi
Kenichi Higuchi
Hiroyuki Atarashi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NTT Docomo Inc
Original Assignee
NTT Docomo Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NTT Docomo Inc filed Critical NTT Docomo Inc
Publication of WO2006106676A1 publication Critical patent/WO2006106676A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1887—Scheduling and prioritising arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0008—Modulated-carrier systems arrangements for allowing a transmitter or receiver to use more than one type of modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0016—Time-frequency-code
    • H04L5/0017—Time-frequency-code in which a distinct code is applied, as a temporal sequence, to each frequency
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0028—Variable division
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0078—Timing of allocation
    • H04L5/0087—Timing of allocation when data requirements change
    • H04L5/0089—Timing of allocation when data requirements change due to addition or removal of users or terminals

Definitions

  • the present invention relates to a technical field of wireless communication, and more particularly to a transmission device and a reception device that enable coexistence of a single carrier system and a multicarrier system.
  • IMT-2000 International Mobile Telecommunications-2000
  • IMT-2000 International Mobile Telecommunications-2000
  • W-CDMA Wideb and CDMA
  • HSDPA high speed downlink packet access
  • HSDP A employs an adaptive modulation and channel coding (AMC) method, an automatic repeat request (ARQ) method for packets in the MAC layer, and the like, thereby enabling a high transmission rate.
  • Nya is aiming for high quality.
  • OFCDM Orthogonal Frequency and Code Division Multiplexing
  • Patent Document 1 A publicly known example relating to a communication system in which single carrier terminals and multicarrier terminals can be mixed is described in Patent Document 1, for example.
  • Patent Document 1 2004-72455
  • the present invention has been made in view of the above problems, and the problem is that at least a part of the first communication system of the single carrier system and the second communication system of the multicarrier system are used.
  • the present invention provides a transmission device and a reception device that can coexist while sharing a frequency band.
  • a transmission apparatus that can be used in the first communication system of the single carrier scheme and the second communication system of the multicarrier scheme is used.
  • This apparatus transmits a single carrier packet on a downlink channel, and after the first retransmission waiting period has elapsed, a first retransmission means for resending the single carrier packet on demand, and a multicarrier packet on the downlink channel Transmit and after the second retransmission waiting period elapses Second retransmitting means for retransmitting the packet.
  • the second retransmission means transmits one or more multi-carrier packets during the first retransmission waiting period.
  • the first communication system of the single carrier system and the second communication system of the multi carrier system can share at least some frequency bands in the same region.
  • FIG. 1A is a diagram showing an example of a frequency band.
  • FIG. 1B is a diagram showing an example of a frequency band.
  • FIG. 2 shows an overall view of a transmitter according to an embodiment of the present invention.
  • FIG. 3 is a diagram showing details of first and second baseband processing units according to an embodiment of the present invention.
  • FIG. 4 is a diagram showing frequency spectra of signals used in the first and second communication systems.
  • FIG. 5 shows a conceptual diagram of a packet transmitted by the transmitter of FIGS.
  • FIG. 6 is a diagram showing another mode of transmitting a packet.
  • FIG. 7 is a diagram showing details of first and second baseband processing units according to an embodiment of the present invention.
  • FIG. 8 shows a conceptual diagram of a packet transmitted from the transmitter according to the present embodiment.
  • FIG. 9 is a diagram showing details of a baseband processing unit according to an embodiment of the present invention.
  • FIG. 10 shows a transmitter in which the processing elements are made more common than the baseband processing unit shown in FIG.
  • FIG. 11 is an overall view of a receiver according to an embodiment of the present invention.
  • FIG. 12 shows details of the first baseband processing unit in FIG. 11.
  • FIG. 13 shows details of the second baseband processing section in FIG. 11.
  • FIG. 14 shows a baseband processing unit of a receiver according to an embodiment of the present invention.
  • FIG. 15 A block diagram of a spreading unit used in a VSCRF—CDMA transmitter.
  • FIG. 16 shows a block diagram of a despreading unit used in a VSCRC-CDMA receiver.
  • FIG. 17 is an explanatory diagram relating to main operations in the VSCRF-CDMA system. Explanation of symbols
  • 201, 202 First and second baseband processing units; 204 multiplexing unit; 206 RF transmission unit; 2 10 digital-to-analog conversion unit; 212 quadrature modulator; 214 local oscillator; 216 band-pass filter; 218 mixer; 222 bandpass filter; 2 24 power amplifier;
  • 302 convolutional encoder 304 data modulation unit; 306, 308 spreading unit; 310 multiplexing unit; 312 band-limiting filter; 322 turbo encoder; 324 data modulator; 326 spreading unit; 330 multiplexing unit; 334 transmission TTI control unit; 34 2 turbo encoder; 344 data modulator; 345 interleaver; 347 serial-parallel conversion unit; 349 spreading unit; 350 fast inverse Fourier transform unit; 352 guard interval insertion unit; 354 transmission TTI control unit ;
  • 902 interleaver 904 fast Fourier transform unit; 906 band limiting filter;
  • 1102 RF receiver 1111, 1112 1st and 2nd base node processor; 1103 Low noise amplifier; 1104 Mixer; 1105 Local oscillator; 1106 Bandpass filter; 1 107 Automatic gain controller; 1108 Quadrature detector; 1109 Local Oscillator; 1110 Analog to digital converter;
  • 1402 Demultiplexer; 1403 Band-limiting filter; 1404 Fast inverse Fourier transform unit;
  • a single carrier packet is retransmitted in response to a request after the first retransmission waiting period has elapsed.
  • Multi-carrier packets are also retransmitted upon request after the second retransmission wait period.
  • One or more multicarrier packets are transmitted during the first retransmission wait period. Since single carrier packets and multicarrier packets are transmitted in different time slots, both signals are transmitted without interfering with each other. Coexistence of both systems can be realized by transmitting other system packets in addition to the same system packets within the first retransmission waiting period. Therefore, for example, even if there is no unallocated band as shown in Fig.
  • the OFCDM system can coexist in the same region using the existing W-CDMA band. wear.
  • the packet since the packet is not retransmitted later than the first retransmission waiting period for the first communication system, even if the new second communication system coexists, the old first communication
  • the system can be operated as before.
  • the transmission time interval of a single carrier packet is equal to the transmission time intervals of a plurality of multicarrier packets.
  • One single-carrier packet and multiple multi-carrier packets are sent alternately.
  • control channel power of the first communication system is shared by the first and second communication systems.
  • the control channel is transmitted continuously in time. Thereby, resources can be saved.
  • the first control channel for the first communication system and the second control channel for the second communication system are transmitted separately.
  • the first control channel is transmitted together with the single carrier packet
  • the second control channel is transmitted together with the multicarrier packet.
  • inter-system interference can be greatly reduced.
  • means for Fourier transforming a signal representing a single carrier packet filter means for band-limiting the signal after Fourier transformation, a signal after band limitation, and a multicarrier signal
  • the transmission apparatus further includes means for time-multiplexing a signal representing a packet and means for performing inverse Fourier transform on the time-multiplexed signal.
  • the transmission apparatus further includes an encoding unit that selects and encodes one of signals representing single carrier or multicarrier packets.
  • the encoding means can be shared by both systems.
  • a transmitter usable in a first communication system using a single carrier scheme and a second communication system using a multicarrier scheme performs Fourier transform on a signal representing a single carrier packet. Then, when the bandwidth is limited, time-multiplexed with a signal representing a multi-carrier packet, and the multiplexed signal is transmitted after inverse Fourier transform, the receiving device that receives the transmitted signal receives the received signal. Is then temporally separated into a signal representing a single carrier packet and a signal representing a multicarrier packet, and a signal representing a single carrier packet is inverse Fourier transformed.
  • FIG. 2 shows an overall view of a transmitter according to one embodiment of the present invention.
  • the transmitter is typically provided in a base station and transmits a downlink channel, but may be provided in a mobile station.
  • the transmitter transmits a W-CDMA packet and an OFCDM packet. More generally, the transmitter transmits a single carrier packet and a multicarrier packet. It is extensible.
  • the transmitter includes a first baseband processing unit 201, a second baseband processing unit 202, a multiplexing unit 204, and an RF transmission unit 206.
  • the RF transmitter 206 includes a digital-analog converter 210, a quadrature modulator 212, a local oscillator 214, a bandpass filter 216, a mixer 218, a local oscillator 220, a bandpass filter 222, and a power amplifier 224.
  • the first baseband processing unit 201 is based on the W-CDMA scheme.
  • a high-band signal processing unit that performs signal processing related to the HSDPA system. For example, necessary parameters are determined by AMC and ARQ. Also, mapping in the Internet Protocol (IP) and signal processing related to the MAC layer and physical layer are performed.
  • IP Internet Protocol
  • the second baseband processing unit 202 is a baseband signal processing unit related to the OFCDM system, as will be described later. In this signal processing unit, for example, determination of parameters necessary for AMC and ARQ, mapping in the Internet protocol, signal processing for the MAC layer and the physical layer, and the like are performed.
  • the multiplexing unit 204 selects and outputs one of the signals output from the first and second baseband processing units 201 and 202, thereby time-multiplexing those signals.
  • the RF transmission unit 206 performs processing for transmitting a baseband signal to be transmitted as a radio signal.
  • the digital-analog converter (DZA) converts digital signals into analog signals.
  • the quadrature modulator 210 generates an in-phase component (I) and a quadrature component (Q) having an intermediate frequency from the signal input thereto.
  • the band pass filter 212 removes excess frequency components for the intermediate frequency band.
  • the mixer 218 uses the local oscillator 220 to convert (up-convert) the intermediate frequency signal into a high frequency signal.
  • the bandpass filter 222 removes excess frequency components.
  • the power amplifier 224 amplifies signal power in order to perform radio transmission from the antenna 226.
  • FIG. 3 shows details of the first and second baseband processing units 201 and 202 according to an embodiment of the present invention. In this example, it is also used for the control channel power OFCDM system for W-CDMA system (the first communication system).
  • the first baseband processing unit 201 includes a convolutional encoder 302, a data modulation unit 304, spreading units 306 and 308, a multiplexing unit 310, and a band limiting filter 312.
  • the first baseband processing unit 201 includes a turbo encoder 322, a data modulator 324, a spreading unit 326, a multiplexing unit 330, a band limiting filter 332, and a transmission TTI control unit 334.
  • the second baseband processing unit 202 includes a turbo encoder 342, a data modulator 344, an interleaver 345, a serial-parallel conversion unit 347, a spreading unit 349, a fast inverse Fourier transform unit 350, a guard interval It has an insertion unit 3 52 and a transmission TTI control unit 354.
  • the convolutional encoder 302 increases the error resilience of data transmitted on the control channel. Is encoded.
  • the data modulator 304 modulates the control channel using, for example, a QPSK modulation method. Any suitable modulation scheme may be adopted, but since the amount of information of the control channel is relatively small, in this embodiment, the QPSK modulation scheme with a small number of modulation multi-values is adopted.
  • the spreading unit 306 performs code spreading by multiplying the control channel by a predetermined spreading code.
  • spreading section 308 performs code spreading by multiplying a pilot channel by a predetermined spreading code.
  • Multiplexer 310 multiplexes the spread control channel and the spread pilot channel. Multiplexing may be performed using one or more of time multiplexing, frequency multiplexing, and code multiplexing.
  • the band limiting filter 312 is composed of, for example, a root Nyquist filter, and performs band limiting.
  • the turbo encoder 322 of the first baseband processing unit 201 performs code encoding for improving error resilience of data transmitted through the data channel.
  • the data modulator 324 modulates the transmission data with an appropriate modulation method.
  • the modulation scheme may be, for example, QPSK, 16QAM, 64 QAM, or any other suitable modulation scheme.
  • the spreading unit 326 code spreads the data channel.
  • Multiplexer 330 multiplexes the code-spread pilot channel and data channel as necessary. For example, when the transmission channels of the control channel and the data channel are different and the propagation paths of the two are significantly different, a pilot channel for the data channel may be transmitted in addition to the pilot channel for the control channel.
  • the band limiting filter 332 is also configured with a root Nyquist filter force, for example, and performs band limiting.
  • the transmission TTI control unit 334 gives the data channel to the multiplexing unit 204 on the basis of the transmission time interval (TTI: Transmission Time Interval) in the first W-CDMA system.
  • the TTI of the first communication system may be 2 ms, for example. Details of the operation of the transmission TTI control unit will be described later.
  • turbo encoder 342 of the second baseband processing unit improves error tolerance of data transmitted on the data channel of the OFCDM system (referred to as the second communication system).
  • the sign y for The data modulator 344 modulates the transmission data with an appropriate modulation method.
  • the modulation method may be any suitable modulation method such as QPSK, 16QAM, 64QAM, and the like.
  • Interleaver 345 determines the data channel to be transmitted. Change the order of signals to be displayed.
  • the serial-parallel converter (SZP) 347 converts a serial signal sequence (stream) into a plurality of parallel signal sequences.
  • the spreading unit 349 code spreads the data channel.
  • the fast inverse Fourier transform unit 350 performs fast inverse Fourier transform on the input signal and performs OFDM modulation.
  • the guard interval insertion unit 352 creates a symbol in the OFDM scheme by adding a guard interval to the signal to be transmitted. As is well known, the guard interval is obtained by duplicating the beginning or end of the symbol to be transmitted.
  • control channel input to first baseband processing section 201 is convolutionally encoded, QPSK modulated, code spread, and multiplexed by multiplexing section 310 together with the spread pilot channel.
  • the multiplexed signal is band-limited and provided to the multiplexing unit 204.
  • the data channel input to first baseband processing section 201 is encoded by turbo encoder 322, modulated, spread, band-limited, and input to transmission TTI control section 334.
  • the transmission TTI control unit 334 provides a data channel from various users to the multiplexing unit 204 for each packet, or provides a retransmission target packet to the multiplexing unit 204 in order to retransmit a transmitted packet in response to a request.
  • the data channel input to second baseband processing section 202 is encoded by turbo encoder 342, modulated, rearranged by interleaver 345, parallelized by serial-parallel conversion section 347, and subcarriers. Diffused for each component.
  • the spread data channel is modulated by the fast inverse Fourier transform unit 350 using the OFDM method, and a guard interval is added to the modulated signal, which is input to the transmission TTI control unit 354.
  • the transmission TTI control unit 354 provides a data channel having various user capabilities to the multiplexing unit 204 for each packet, or supplies a retransmission target packet to the multiplexing unit 204 in order to retransmit the transmitted packet in response to a request. .
  • a data channel to be transmitted is a single carrier packet.
  • the data channel on which the second communication system is also transmitted is a multi-carrier packet. Therefore, the frequency spectrum waveforms of the input signal of the transmission TTI control unit 334 and the input signal of the transmission TTI control unit 354 are significantly different (FIG. 4). Therefore, if these signals are transmitted simultaneously in the same frequency band, it is expected that the interference between the systems will become very large.
  • a W-CDMA 3G communication system such as IMT2000
  • an automatic repeat request (ARQ) control method is adopted, and a certain packet is transmitted. If necessary, the same packet is retransmitted after a predetermined period.
  • This predetermined period or the time waiting for retransmission is defined by the standard to be a period of 5TT 1 (5 packets) (in other words, the DSCH round trip time (RTT) is 6 ⁇ ).
  • RTT DSCH round trip time
  • FIG. 5 shows a conceptual diagram of a packet transmitted by the transmitter of FIGS.
  • FIG. 5 shows a packet related to the control channel and a packet for the data channel used in the first and second communication systems.
  • the horizontal direction (left-right direction) represents the time direction.
  • the control channel is shared by both the first and second communication systems and is transmitted continuously in time.
  • Packets related to the data channel are time-multiplexed and transmitted between the first and second communication systems.
  • a state in which a packet (single carrier packet) of the first communication system and a packet (multicarrier packet) of the second communication system are alternately transmitted is shown.
  • single carrier packets are transmitted in the time slots indicated by Al, A2,..., And multicarrier packets are transmitted in the time slots indicated by Bl, B2,.
  • the TTI of a single carrier packet is 2 ms
  • the TTI of a multicarrier packet is 0.25 ms.
  • the specific value of the transmission time interval TTI for each communication system is just an example, and various other values may be adopted.
  • the first communication system can satisfactorily receive the control channel and the data channel.
  • the data channel of the second communication system is subject to some intersystem interference.
  • the amount of information in the control channel is small, such interference will be negligible in many cases.
  • a single carrier packet is retransmitted in the same single carrier packet after 5 TTIs have elapsed since the transmission.
  • a single carrier packet transmitted in time slot A1 is retransmitted in time slot A4. Therefore, the existing specifications regarding the first communication system need not be changed.
  • the multi-carrier packet is also retransmitted after 5 days (after the second communication system). In this case, as shown in the enlarged view of FIG. 5, the packet transmitted in B in time slot B2 immediately after time slot A2 is retransmitted in time slot B. Similarly, times
  • the packet sent in time slot B is sent to B in time slot B3 immediately after time slot A3.
  • Retransmission of packets transmitted in the base stations B to B is delayed by about 2 ms (8 packets).
  • FIG. 5 is a diagram showing another aspect of the transmission method.
  • any suitable transmission method may be used. More generally, one or more single carrier packets and one or more multicarrier packets may be transmitted during the retransmission waiting period for single carrier packets.
  • FIG. 7 shows the first and second baseband processing units 201 and 202 according to an embodiment of the present invention. Elements already described with respect to Figure 3 are given similar reference numerals and redundant description is omitted.
  • a control channel is prepared separately for each of the first and second communication systems, and these are transmitted while being time-multiplexed with the data channel.
  • the multiplexing units 310 and 330 in FIG. 3 are depicted integrally as the multiplexing unit 310 in FIG. Therefore, in FIG. 7, the convolutional encoder 362, the data modulator 364, the interleaver 365, the serial / parallel converter 367, the spreading unit 369, and the multiplexing unit 348 are related to the second control channel. Is drawn. Since these elements are the same as those already described, redundant description is omitted.
  • FIG. 8 shows a conceptual diagram of a packet transmitted from the transmitter according to the present embodiment.
  • the data channel is transmitted alternately between the first and second communication systems, as in FIG.
  • the control channel is also transmitted alternately according to the switching. That is, the single carrier packet and the control channel are multiplexed by the multiplexing unit 310, and transmission is started simultaneously and transmission is stopped simultaneously. Similarly, the multicarrier packet and the control channel are multiplexed by the multiplexing unit 348, and transmission is started simultaneously and transmission is stopped simultaneously.
  • inter-system interference caused by the control channel can be suppressed.
  • FIG. 9 shows details of a baseband processing unit according to an embodiment of the present invention.
  • Elements that have already been described are given similar reference numbers, and redundant descriptions are omitted. It should be noted that in Fig. 9, the elements related to the control channel are not drawn for simplicity.
  • an interleaver 902, a fast Fourier transform unit 904, and a band limiting filter 906 are depicted on the first baseband processing unit 201 side.
  • Interleaver 902 changes the arrangement of data channel signals according to a predetermined pattern.
  • the fast Fourier transform unit 904 performs fast Fourier transform on the spread data channel.
  • the time domain input signal is converted into a frequency domain signal and output.
  • the band limiting filter 906 performs band limiting in the same manner as the band limiting filters 312 and 332 of FIGS. 3 and 7, but the band limiting filter 906 performs band limiting in the frequency domain. This is different from the band limiting filter 312 and the like shown in FIG.
  • the processing power relating to the multiplexing unit 204, the fast inverse Fourier transform unit 350, and the guard-inner insertion unit 352 is performed in common to the first and second baseband processing units 201 and 202. Therefore, it should be noted that the transmission TTI control units 334 and 354 are drawn on the input side.
  • the processing power after the multiplexing unit 204 is performed in common to the first and second baseband processing units 201 and 202, and a fast Fourier transform unit 904 is provided between the spreading unit 326 and the band limiting filter 906. ing.
  • the multi-carrier packet is the same as that already described, and therefore a redundant description is omitted.
  • the single carrier packet is processed by the fast Fourier transform unit 904 and the fast inverse Fourier transform unit 350, so that modulation by the OFDM method is not performed. In this way, a part of signal processing is shared, and the band limiting process of the single carrier packet is performed in the frequency domain by the band limiting filter 906. Special attention should be paid to the fact that the calculation load of the band limiting filter 906 is much lighter than that of the band limiting filter 312 in FIG. In the bandwidth limitation processing in the time domain, in order to obtain the value after bandwidth limitation at each time point, it is necessary to weight and add a plurality of samples before and after that time point.
  • FIG. 10 shows a transmitter in which elements are further shared as compared with the baseband processing unit shown in FIG. Duplicate explanations for already described elements are omitted.
  • a buffer 1002 and a separation unit 1004 are newly drawn.
  • Buffer 1002 receives and temporarily stores data channels for single carrier packets and multicarrier packets. These are selectively input to the turbo encoder in accordance with each transmission time interval TTI.
  • Separating section 1004 time-divides the data channel related to the single carrier packet and the data channel related to the multi-carrier packet in accordance with each time.
  • FIG. 11 shows an overall view of a receiver according to an embodiment of the present invention.
  • a receiver may be provided in a power base station typically provided in a mobile station.
  • the receiver according to the present embodiment receives signals transmitted from the transmitters of FIGS.
  • this receiver is provided in a mobile station, and antenna diversity using two antennas is performed in order to improve signal quality. Since signals received for each antenna are similarly processed by similar processing elements, the signal processing elements and functions related to one antenna will be described on behalf of them.
  • the mobile station includes an RF receiving unit 1102 connected to one of the antennas, a first baseband processing unit 1111, and a second baseband processing unit 1112.
  • the RF receiver 1102 includes a low noise amplifier (LNA) 1103, a mixer 1104, a local oscillator 1105, a band pass filter 1106, an automatic gain controller 1107, a quadrature detector 1108, a local oscillator 1109, an analog digital A conversion unit 1110.
  • LNA low noise amplifier
  • mixer 1104 a local oscillator 1105
  • band pass filter 1106 an automatic gain controller 1107
  • quadrature detector 1108 a local oscillator 1109
  • the RF receiver 1002 performs processing such as power amplification, frequency conversion, and band limitation on the high-frequency signal received by the antenna.
  • the low noise amplifier 1103 appropriately amplifies the signal received by the antenna.
  • the amplified signal is converted to an intermediate frequency by the mixer 1104 and the local oscillator 1105 (down-conversion).
  • the band pass filter 1106 removes unnecessary frequency components.
  • the automatic gain controller (AGC) 1107 ensures that the signal level is maintained properly. As such, the gain of the amplifier is controlled.
  • the quadrature detector 1108 uses the local oscillator 1109 to perform quadrature demodulation based on the in-phase component (I) and the quadrature component (Q) of the received signal.
  • the analog-digital converter (AZD) 1110 converts an analog signal into a digital signal.
  • the first baseband processing unit 1111 performs baseband processing of signals related to a single carrier communication system (for example, a W-CDMA system) which is the first communication system.
  • a single carrier communication system for example, a W-CDMA system
  • IP connection and protocol processing related to the MAC layer and physical layer are also performed.
  • Baseband processing includes, for example, determining necessary parameters using AMC and ARQ.
  • the second baseband processing unit 1112 performs baseband processing of signals related to a multicarrier communication system (for example, OFCDM system) that is the second communication system.
  • a multicarrier communication system for example, OFCDM system
  • IP connection and protocol processing related to the MAC layer and physical layer are also performed.
  • Baseband processing includes, for example, determining the parameters necessary for AMC and ARQ.
  • the mobile station may be a terminal dedicated to the first or second communication system, or may be a terminal that can be shared by both systems.
  • the dedicated terminal includes only one of the first and second baseband processing units.
  • a sharable terminal has both the first and second baseband processing units.
  • FIG. 12 shows details of the first baseband processing unit 1111 shown in FIG. In FIG. 12, a band limiting filter 1202, a no searcher 1204, a despreading unit 1206, a channel estimation unit 1208, a rake combining unit 1210, a combining unit 1212, and a turbo decoder 1214 are depicted.
  • the band limiting filter 1202 is also configured with a root Nyquist filter force, for example, and performs band limiting.
  • the path searcher 1204 searches for a path in the multipath propagation path. The path search is performed, for example, by examining a delay profile.
  • the despreading unit 1206 despreads the signal in accordance with the pass timing.
  • the channel estimation unit 1208 performs channel estimation using path timing. The channel estimator 1208 controls the amplitude and phase so as to compensate for fading generated in the propagation path according to the estimation result. Output control signal.
  • the rake combiner 1210 combines and outputs the despread signal while compensating for each path.
  • Combining section 1212 combines received signals obtained for each antenna. Any suitable synthesis method may be employed.
  • the synthesis method may include, for example, a selection method, an equal gain synthesis method, a maximum ratio synthesis method, and the like.
  • the turbo decoder 1214 decodes the received signal and demodulates the data.
  • a signal received by each antenna is processed for each antenna as described above.
  • the received signal is converted into a digital signal through processing such as amplification, frequency conversion and band limitation in the RF receiver.
  • the digital signal is band-limited for each subcarrier, despread, and rake-combined for each path.
  • a signal for each subcarrier after rake combining is obtained for each antenna, and they are combined and decoded by the combining unit 1212, and the transmitted signal is restored.
  • FIG. 13 shows details of the second baseband processing unit 1112 of FIG.
  • FIG. 13 shows a symbol timing detection unit 1302, a guard interval removal unit 1304, a fast Fourier transform unit 1306, a demultiplexer or separation unit 1308, a channel estimation unit 1310, a despreading unit 1312, and a parallel-serial conversion.
  • Portion (PZS) 1314, despreading unit 1316, combining units 1318 and 1319, Dintalino 1320, turbo encoder 1322 and Viterbi decoder 1324 are depicted.
  • the symbol timing detection unit 1302 detects the timing of symbols (symbol boundaries) based on the digital signal!
  • the guard inverter removing unit 1304 removes a portion of the received signal power corresponding to the guard interval.
  • the fast Fourier transform section 1306 performs fast Fourier transform on the input signal, and performs demodulation of the OFDM scheme. As a result, the received signal is converted into a signal in the frequency domain.
  • the demultiplexer 1308 separates the pilot channel, control channel, and data channel multiplexed in the received signal. This separation method is performed corresponding to multiplexing on the transmission side (contents of processing in the multiplexing unit 310 and the like in FIG. 3).
  • Channel estimation section 1310 estimates the state of the propagation path using the pilot channel, and A control signal for adjusting the amplitude and the phase is output so as to compensate for the channel fluctuation. This control signal is output for each subcarrier.
  • Receiveding section 1312 despreads the channel channel after channel compensation for each subcarrier.
  • the code multiplex number is assumed to be C.
  • Parallel-serial converter (P / S) 1314 converts a parallel signal sequence into a serial signal sequence.
  • Despreading section 1316 despreads the channel compensated control channel for each subcarrier.
  • the combining units 1318 and 1319 combine the signals processed for each antenna by an appropriate combining method such as a selection method, an equal gain combining method, or a maximum ratio combining method.
  • Dinthaler 1320 changes the order in which signals are arranged according to a predetermined pattern.
  • the predetermined pattern corresponds to the reverse pattern of reordering performed by the transmitting interleaver (eg 345 in Fig. 3).
  • the turbo encoder 1322 and the Viterbi decoder 1324 decode the traffic information data and the control information data, respectively.
  • the signal received by the antenna is converted into a digital signal through processing such as amplification, frequency conversion, band limitation, quadrature demodulation, and the like in the RF receiver.
  • the signal from which the guard interval is removed is demodulated by the OFDM method by the fast Fourier transform unit 1306.
  • the demodulated signal is separated into a pilot channel, a control channel, and a data channel by a separation unit 1308.
  • the pilot channel is input to the channel estimation unit, and a control signal that compensates for fluctuations in the transmission path is output for each subcarrier.
  • the data channel is compensated using the control signal, despread for each subcarrier, and converted to a serial signal.
  • the converted signal is rearranged in a dinary bar 1320 by a reverse pattern to the rearrangement performed by the interleaver, and decoded by the turbo decoder 1322.
  • channel fluctuation is compensated by the control signal, despread, and decoded by the Viterbi decoder 1324. Thereafter, signal processing using the restored data and the control channel is performed.
  • FIG. 14 shows a baseband processing unit of a receiver according to an embodiment of the present invention. Elements already described in Figs. 12, 13 are given the same reference numbers, and redundant explanations are omitted.
  • the receiver according to the present embodiment receives signals from the transmitter shown in FIGS. Therefore, the signal transmitted from the transmitter and received by the receiver is a signal obtained by time-multiplexing a single carrier packet and a multicarrier packet and then inversely transforming the Fourier transform.
  • a demultiplexer 1402, a band limiting filter 1403, a high-speed inverse-field conversion unit 1404, and a dintariba 1406 are newly drawn. Elements related to the control channel are not drawn for the sake of simplicity.
  • the demultiplexer 1402 separates the pilot channel, the control channel, and the data channel that are multiplexed into the received signal! /. Further, the demultiplexer 1402 also temporally separates and outputs the single carrier packet that has been time multiplexed.
  • the band limiting filter 1403 performs band limiting processing on a signal (time-separated signal) input thereto in the frequency domain. Similar to the band limiting filter 906 in FIG. 9, the band limiting process performed here can be performed very easily.
  • Fast inverse Fourier transform section 1404 performs fast Fourier inverse transform on the signal related to the single carrier packet after the band limitation. As a result, the signal related to the single carrier packet is converted into a signal in the time domain.
  • the dintariba 1406 changes the order in which the signals are arranged according to a predetermined pattern.
  • the predetermined pattern corresponds to the reverse pattern of reordering performed by the transmitting interleaver (such as 902 in Fig. 9).
  • a signal received by the antenna is converted into a digital signal through processing such as amplification, frequency conversion, band limitation, orthogonal demodulation, and the like in the RF reception unit.
  • the fast Fourier transform unit 1306 converts the signal from which the guard interval has been removed into a frequency domain signal.
  • OFDM demodulation is performed.
  • the signal converted into the frequency domain signal is temporally separated into a multicarrier bucket (including pilot channel, control channel, and data channel) and a single carrier packet by a separation unit 1308.
  • Multi-carrier packets are described in Figure 13. Since the same processing is performed, redundant explanation is saved.
  • the separated single carrier packet is subjected to band limitation in the frequency domain by the band limiting filter 1202, and then subjected to inverse Fourier transform. By this conversion, the single carrier packet is converted into a time domain signal. The converted signal is despread, channel-compensated, deinterleaved and then decoded.
  • Embodiments 1 to 5 described above are intended for coexistence of a plurality of systems on the downlink.
  • the sixth embodiment described below typically aims at coexistence of multiple systems in the uplink.
  • the uplink apart from high-speed and high-quality channel, there is a strong demand for lower power consumption of mobile stations.
  • VSCRF-CDMA variable spreading factor chip repetition factor CDMA
  • the configuration and operation of the transmitter and receiver used for this uplink are almost the same as those of direct sequence CDMA (DS-CDMA) transmitters and receivers.
  • DS-CDMA direct sequence CDMA
  • FIG. 15 shows a block diagram of a spreading unit used in a VSCRF—CDMA transmitter. Accordingly, the operation of the spreading unit described below is typically performed at the mobile station.
  • the spreading unit includes a code multiplication unit 1602, an iterative synthesis unit 1604, and a phase shift unit 1606.
  • Code multiplication section 1602 multiplies the transmission signal by a spreading code.
  • a multiplier 1612 multiplies the transmission signal by a channelization code determined under a given code spreading factor SF.
  • a multiplier 1614 multiplies the transmission signal by a scramble code.
  • the code spreading factor SF in this embodiment is appropriately set according to the communication environment. More specifically, the code spreading factor SF may be set based on one or more of the propagation path state, cell configuration, traffic volume, and radio parameter. The code spreading factor SF may be set by the base station or the mobile station. However, when using information managed on the base station side such as traffic volume, it is preferable to determine the code spreading factor at the base station.
  • Iterative combining section 1604 compresses the spread transmission signal in terms of time and repeats it a predetermined number of times (CRF times).
  • Phase shift section 1606 shifts (shifts) the phase of the transmission signal by a predetermined frequency.
  • the phase amount to be shifted is set uniquely for each mobile station.
  • FIG. 16 shows a block diagram of a despreading unit used in a VSCRC-CDMA receiver.
  • This despreading unit typically operates in a base station.
  • the despreading unit includes a phase shift unit 1702, an iterative combining unit 1704, and a code despreading unit 1706.
  • Phase shift section 1702 multiplies the received signal by the phase amount set for each mobile station, and separates the received signal into a signal for each mobile station.
  • the iterative synthesis unit 1704 expands the repeated data in terms of time (uncompressed).
  • Code despreading section 1706 performs despreading by multiplying the received signal by the spreading code for each mobile station.
  • FIG. 17 is a diagram for explaining the main operation in the VSCRF-CDMA system.
  • one data group with a signal sequence after code spreading is represented by d 1, d 2, d 1
  • This group of signal sequences has a period corresponding to T X Q as a whole. This signal
  • a sequence 1802 corresponds to an input signal to the iterative synthesis unit 1604. This signal sequence is compressed to 1ZCRF over time, and the compressed signal is repeated over a period of T X Q.
  • the converted signal sequence is represented by 1804 in FIG. Figure 17 also shows the guard interval period.
  • Temporal compression can be performed, for example, using a frequency that is CRF times higher than the clock frequency used for the input signal. As a result, the period of individual data d is compressed to T ZCRF (however, CR i S
  • the compressed and repeated signal sequence 1804 is output from the iterative combining unit 1604, input to the phase shifting unit 1606, shifted by a predetermined phase amount, and output.
  • the phase amount is set for each mobile station, and is set so that uplink signals for each mobile station are orthogonal to each other on the frequency axis. Thereby, in the received signal of the uplink or base station
  • the frequency spectrum generally looks like that shown at 1806 in FIG. In the figure, the band indicated as the spreading bandwidth indicates the band that will be occupied if the signal sequence 1802 after spreading is transmitted as it is.
  • the spectrum at the stage of time compression and repetition (the spectrum of the output signal of the repetition synthesis unit 1604) occupies a narrow band, but the band is common to all mobile stations.
  • these bands can be prevented from overlapping each other.
  • the frequency band related to each mobile station can be narrowed, and the frequency spectrum related to each mobile station can be arranged in a comb-like shape. Orthogonalization can be realized.
  • phase shifter 1702 On the receiving side, an operation opposite to that on the transmitting side is performed. That is, in accordance with the phase amount for each mobile station, the phase is added to the received signal by the phase shifter 1702 in FIG.
  • the input signal is uncompressed in terms of time, converted into a spread signal sequence, and output from the iterative synthesis unit 1704.
  • Despreading is performed by multiplying this signal by a predetermined spreading code by the despreading section 1706. Thereafter, further processing is performed by the elements already described.
  • the radio frequency waveform and chip rate of the signal transmitted by the VSCRF-CDMA system employed in the uplink are the same as those of the W-CDMA system. This is because the repeated processing performed in the VSCRF—CDMA system does not change the power chip rate that rearranges the data order. Therefore, for the uplink, the first and second communication systems can be easily coexisted by adopting the VSCRF-CDMA system for the second communication system.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
  • Radio Relay Systems (AREA)

Abstract

L'invention concerne un appareil d'émission qui peut être utilisé dans un premier système de communication de format à porteuse unique et dans un second système de communication de format à porteuses multiples. Cet appareil comprend un premier moyen de réémission qui émet un paquet à porteuse unique par l'intermédiaire d'un canal de liaison descendante et qui réémet le paquet à porteuse unique en réponse à une demande après l'écoulement d'un premier intervalle d'attente de réémission, ainsi qu'un second moyen de réémission qui émet un paquet à porteuses multiples par l'intermédiaire du canal de liaison descendante et qui réémet le paquet à porteuses multiples en réponse à une demande après l'écoulement d'un second intervalle d'attente de réémission. Le second moyen de réémission réémet au moins un paquet à porteuses multiples pendant le premier intervalle d'attente de réémission.
PCT/JP2006/306302 2005-04-01 2006-03-28 Appareil d'emission et appareil de reception Ceased WO2006106676A1 (fr)

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JP2009284140A (ja) * 2008-05-21 2009-12-03 Nippon Telegr & Teleph Corp <Ntt> 通信ネットワーク及びｉｐ多重化装置
JP2011517234A (ja) * 2008-04-07 2011-05-26 クゥアルコム・インコーポレイテッド 確保されたリソースブロックを使用して制御チャネルを定義するシステムおよび方法
US8675537B2 (en) 2008-04-07 2014-03-18 Qualcomm Incorporated Method and apparatus for using MBSFN subframes to send unicast information
US8761032B2 (en) 2007-11-16 2014-06-24 Qualcomm Incorporated Random reuse based control channels
US8798665B2 (en) 2007-11-15 2014-08-05 Qualcomm Incorporated Beacon-based control channels
US9009573B2 (en) 2008-02-01 2015-04-14 Qualcomm Incorporated Method and apparatus for facilitating concatenated codes for beacon channels
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US8798665B2 (en) 2007-11-15 2014-08-05 Qualcomm Incorporated Beacon-based control channels
US9326253B2 (en) 2007-11-15 2016-04-26 Qualcomm Incorporated Wireless communication channel blanking
US8761032B2 (en) 2007-11-16 2014-06-24 Qualcomm Incorporated Random reuse based control channels
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JP2011517234A (ja) * 2008-04-07 2011-05-26 クゥアルコム・インコーポレイテッド 確保されたリソースブロックを使用して制御チャネルを定義するシステムおよび方法
US8675537B2 (en) 2008-04-07 2014-03-18 Qualcomm Incorporated Method and apparatus for using MBSFN subframes to send unicast information
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WO2009142025A1 (fr) * 2008-05-23 2009-11-26 パナソニック株式会社 Dispositif de station mobile de communication sans fil et procédé de distribution et de placement pour des éléments de ressource

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JP2006287759A (ja) 2006-10-19

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