TWI817733B - Self-interference estimation system and method thereof in-band full-duplex communication - Google Patents

Abstract

A self-interference estimation system and method thereof in-band full-duplex communication are provided, which is suitable for including a first node, a second node and a third node, a first transmitting end of the first node transmits a transmitting signal to the second node, while a first receiving end of the first node receives a receiving signal from the third node. The system includes, an orthogonal scrambling code generator is used to generate a first orthogonal scrambling code and a second orthogonal scrambling code. A reference sequence generator is used to generate the reference sequence. The first transmitting end transmit the reference signal which is generated according to the reference sequence and the first orthogonal scrambling code, the first receiving end receives the reference signal while receiving the receiving signal from the third node. A self-interference estimation module is used to restore the reference signal according to the second orthogonal scrambling code and estimate the self-interference of the first node according to the reference signal.

Description

In-band full-duplex communication self-interference estimation system and method

The present invention relates to a self-interference signal estimation system and method, and in particular to an in-band full-duplex communication self-interference estimation system and method.

Wireless communication networks currently use many technologies for the transmission of different signals (eg, downlink and uplink signals). For example, in frequency division duplex (FDD), different signals can be sent simultaneously using different radio frequency carriers. In time-division duplexing (TDD), different signals can be sent on the same radio frequency carrier but in different time slots. As shown in FIG. 1A , which is a schematic diagram of frequency division duplex, the reference signal 20 and the transmission signal 30 can be transmitted simultaneously using different radio frequency carriers using a common bandwidth. As shown in Figure 1B, it is a schematic diagram of time-division duplexing. It is performed during a period when the data transmission rate is not high. The reference signal 20 and the transmission signal 30 can be sent on the same radio frequency carrier but in different time slots.

If in-band full-duplex communication, interference can Can occur in signals sent using this in-band full-duplex communication (different signals can be sent on the same radio frequency carrier and in the same time slot).

Therefore, if the in-band full-duplex device adopts a solution that cannot handle this interference, the integrity of the signal at the receiving device may be compromised, and the industry will hope to solve the problem without adding additional bandwidth or other time periods. The self-interference problem occurs at the receiving end when a full-duplex device transmits and receives signals at the same time.

The present invention provides an in-band full-duplex communication self-interference estimation system and a method thereof, which can effectively improve the self-interference estimation problem of base stations or devices in a wireless communication system in the in-band full-duplex mode.

The in-band full-duplex communication self-interference estimation system of the present invention is suitable for at least including a first node, a second node and a third node. The first communication interface of the first node at least includes a first transmitting end and a first receiving end. Wherein, the first transmitting end of the first node transmits the transmitting signal to the second node, and at the same time, the first receiving end of the first node receives the receiving signal from the third node. The system includes: an orthogonal scrambling code generator for generating a first orthogonal scrambling code. Cross scrambling code and second orthogonal scrambling code. The reference sequence generator is used to generate reference sequences. The first transmitting end transmits a reference signal generated based on the reference sequence and the first orthogonal scrambling code, and the first receiving end receives the reference signal while receiving the received signal from the third node. The self-interference estimation module is used to restore the reference signal based on the second orthogonal scrambling code, and estimate the self-interference of the first node based on the reference signal.

In an embodiment of the present invention, the above-mentioned in-band full-duplex communication self-interference Estimation system, wherein the first orthogonal scrambling code and the second orthogonal scrambling code are selected from the set of orthogonal scrambling codes or generated using OVSF codes or Walsh codes, and the first orthogonal scrambling code and the second orthogonal scrambling code are substantially orthogonal pay.

In an embodiment of the present invention, in the above-mentioned in-band full-duplex communication self-interference estimation system, the operation of the first transmitting end transmitting the reference signal generated based on the reference sequence and the first orthogonal scrambling code further includes: a first The transmitting end transmits a reference signal generated by multiplying the reference sequence and the first orthogonal scrambling code.

In an embodiment of the present invention, in the above-mentioned in-band full-duplex communication self-interference estimation system, the frequencies of the transmission signal, the reception signal and the reference signal overlap.

In an embodiment of the present invention, in the above-mentioned in-band full-duplex communication self-interference estimation system, the first node is a full-duplex device, and the second node and the third node are full-duplex devices or half-duplex devices.

The in-band full-duplex communication self-interference estimation method of the present invention is suitable for at least including a first node, a second node and a third node. The first communication interface of the first node at least includes a first transmitting end and a first receiving end. Wherein, the first transmitting end of the first node transmits a transmitting signal to the second node, and at the same time, the first receiving end of the first node receives the receiving signal from the third node. The method includes: generating a reference sequence and generating a first orthogonal interference. code and the second orthogonal scrambling code; generate a reference signal according to the reference sequence and the first orthogonal scrambling code; transmit the reference signal by the first transmitting end; the first receiving end receives the reference signal while receiving the received signal from the third node ; And restore the reference signal based on the second orthogonal scrambling code, and estimate the self-interference of the first node based on the reference signal.

In an embodiment of the present invention, the above-mentioned in-band full-duplex communication self-interference Estimation method, wherein the first orthogonal scrambling code and the second orthogonal scrambling code are selected from an orthogonal scrambling code set or generated using an OVSF code or a Walsh code, and the first orthogonal scrambling code and the second orthogonal scrambling code are substantially orthogonal pay.

In an embodiment of the present invention, in the above-mentioned in-band full-duplex communication self-interference estimation method, the step of generating a reference signal based on the reference sequence and the first orthogonal scrambling code further includes: combining the reference sequence with the first orthogonal scrambling code. The scrambling codes are multiplied together to produce a reference signal.

In an embodiment of the present invention, in the above-mentioned self-interference estimation method for in-band full-duplex communication, the frequencies of the transmit signal, the received signal and the reference signal overlap.

In an embodiment of the present invention, in the above-mentioned self-interference estimation method for in-band full-duplex communication, the first node is a full-duplex device, and the second node and the third node are full-duplex devices or half-duplex devices.

Based on the above, the present invention provides an in-band full-duplex communication self-interference estimation system and a method thereof, which are used in the transmission of the first node as an in-band full-duplex device in response to different communication systems such as 5G, LTE, CDMA, Wifi, etc. The end or receiving end generates orthogonal scrambling codes and reference signals, so that the orthogonal scrambling codes are substantially orthogonal to each other, which can effectively improve the self-interference estimation problem of base stations or devices in wireless communication systems in in-band full-duplex mode. .

In order to make the above-mentioned features and advantages of the present invention more obvious and easy to understand, embodiments are given below and described in detail with reference to the accompanying drawings.

10: In-band full-duplex communication self-interference estimation system

101: first node

102: Second node

103: The third node

104: Reference sequence generator

105:Orthogonal scrambling code generator

106:Self-interference estimation module

1011: First transmission end

1012: First receiving end

S601, S602, S603, S604, S605: steps

Figure 1A is a schematic diagram of conventional frequency division duplexing.

FIG. 1B is a schematic diagram of conventional time-sharing duplexing.

Figure 2 is a schematic diagram of an in-band full-duplex communication self-interference estimation system according to an embodiment of the present invention.

Figure 3 is a schematic diagram of a first node according to a first embodiment of the present invention.

FIG. 4 is a schematic diagram of a first node and a second node according to a second embodiment of the present invention.

FIG. 5 is a schematic diagram of a first node and a second node according to a third embodiment of the present invention.

Figure 6 is a flow chart of a self-interference estimation method for in-band full-duplex communication according to an embodiment of the present invention.

Figure 2 is a schematic diagram of an in-band full-duplex communication self-interference estimation system according to an embodiment of the present invention.

Referring to Figure 2, the in-band full-duplex communication self-interference estimation system 10 may include a first node 101, a second node 102, a third node 103, a reference sequence generator 104, an orthogonal scrambling code generator 105 and a self-interference estimation system 10. Interference estimation module 106. The first node 101 is a full-duplex device, and the second node 102 and the third node 103 may be full-duplex devices or half-duplex devices. In this embodiment, the first node 101, the second node 102 and the third node 103 may include a storage unit, a processing unit and a communication interface. In another embodiment, the in-band full-duplex communication self-interference estimation system 10 may include more nodes. point. The present invention is not limited thereto.

In this embodiment, the first communication interface of the first node 101 may include a first transmitting end 1011 and a first receiving end 1012, wherein the first transmitting end 1011 of the first node 101 transmits the transmission signal to the second node 102 , and at the same time, the first receiving end 1012 of the first node 101 receives the reception signal from the third node 103 .

The reference sequence generator 104 is used to generate a reference sequence. The orthogonal scrambling code generator 105 is used to generate a first orthogonal scrambling code and a second orthogonal scrambling code. The first transmitting end 1011 of the first node 101 transmits a reference signal generated by multiplying the reference sequence and the first orthogonal scrambling code. The first receiving end 1012 receives the reference signal while receiving the received signal, wherein the transmitting signal and the receiving signal Overlaps the frequency of the reference signal. The self-interference estimation module 106 is used to restore the reference signal based on the second orthogonal scrambling code, and estimate the self-interference (SI) of the first node 101 based on the reference signal.

The first orthogonal scrambling code and the second orthogonal scrambling code are selected from an orthogonal scrambling code set or generated using an OVSF code or a Walsh code, and the first orthogonal scrambling code and the second orthogonal scrambling code are substantially orthogonal.

Figure 3 is a schematic diagram of a first node according to a first embodiment of the present invention.

Specifically, in the in-band full-duplex communication self-interference estimation system 10 including the first node 101, the second node 102 and the third node 103 in the first to third embodiments, the first communication of the first node 101 The interface may include a first transmitting end 1011 and a first receiving end 1012. The first transmitting end 1011 of the first node 101 transmits a transmission signal to the second node 102, and at the same time, the first receiving end 1012 of the first node 101 receives a signal from the third node. 103 receiving signal.

Please refer to Figure 3. The first embodiment is mainly applicable to 5G or LTE communication systems. The orthogonal scrambling code generator 105 generates orthogonal scrambling codes, and the reference sequence generated by the reference sequence generator 104 is generated by orthogonal scrambling. The processor 105 then multiplies this orthogonal scrambling code to generate a reference signal. The first transmitting end 1011 of the first node 101 transmits the reference signal. The first receiving end 1012 of the first node 101 receives the received signal from the third node 103 Receive this reference signal at the same time, thereby restoring the reference sequence according to the orthogonal scrambling code and estimating the self-interference of the first node 101 through the reference sequence, where the average value of the orthogonal scrambling code is essentially zero, and the frequency used by the reference signal is equal to Received signals overlap.

FIG. 4 is a schematic diagram of a first node and a second node according to a second embodiment of the present invention.

Please refer to Figure 4. The second embodiment is mainly suitable for Wifi or Bluetooth communication. In this first node 101, the orthogonal scrambling code generator 105 generates a first orthogonal scrambling code, and the reference sequence generated by the reference sequence generator 104 is phased with the first orthogonal scrambling code through the orthogonal scrambling code generator 105. After multiplication, a reference signal is generated, and the reference signal is added to the original signal to be transmitted to the second node 102 as a transmission signal. Since the original signal can be regarded as a scrambling code of all 1s, it can be demodulated normally for the second node 102 . The receiving end 1012 of the first node 101 receives the reference signal while receiving the received signal of the third node 103. After multiplying the received signal by the second orthogonal scrambling code generated by the orthogonal scrambling code generator 105, the reference signal can be restored. signal, and then use the reference sequence to estimate the self-interference of the first node 101, where the frequencies of the transmitted signal, the reference signal, and the received signal overlap, and the average value of the first orthogonal scrambling code and the second orthogonal scrambling code is substantially zero.

Figure 5 shows the first node and the second node according to a third embodiment of the present invention. Point diagram.

Please refer to Figure 5. The third embodiment is mainly applicable to WCDMA or CDMA2000 communications.

The reference signal is transmitted by the first transmitting end 1011 of the first node 101 . The first receiving end 1012 of the first node 101 receives the reference signal while receiving the received signal from the third node 103 . The reference signal and the received signal use different first orthogonal scrambling codes and second orthogonal scrambling codes, the reference signal is restored based on the second orthogonal scrambling code, and the self-interference of the first node 101 is estimated based on the reference signal, and the first The orthogonal scrambling code and the second orthogonal scrambling code are substantially orthogonal, and the frequencies of the transmitted signal, the received signal and the reference signal overlap.

In this embodiment, since the first node 101 transmits and transmits signals with different scrambling codes, including (but not limited to) PSS/SSS/PDCCH in 5G and SCH/CPICH in WCDMA, it can be directly transmitted through The known transmitted signal is estimated to interfere with itself without the need to generate additional reference signals.

In the above first to third embodiments, if the first node 101 and the second node 102 belong to a 5G or LTE communication system, the orthogonal scrambling code generator 105 can obtain the physical downlink shared channel (PDSCH: The first orthogonal scrambling code and the second orthogonal scrambling code are concentratedly selected from the orthogonal scrambling code of Physical Downlink Shared CHannel), so that the original signal multiplied by the second orthogonal scrambling code and the first orthogonal scrambling code are multiplied to produce The reference signals are substantially orthogonal to each other, and their orthogonal scrambling code lengths or generation methods are the same as LTE or 5G communication systems. If the first node 101 and the second node 102 belong to the WCDMA or CDMA2000 system, the scrambling code generation method can be used as The OVSF code or Walsh code of WCDMA makes the scrambling code generation circuit compatible with the original circuit to reduce circuit complexity and ensure that the orthogonal scrambling codes are substantially orthogonal to each other. As for the manufacturing method of the scrambling code generation circuit, it is customary Those who know the craftsmanship will tell you what they know about the technology, so I won’t go into details here.

Figure 6 is a flow chart of a self-interference estimation method for in-band full-duplex communication according to an embodiment of the present invention.

Please refer to Figure 6. This in-band full-duplex communication self-interference estimation method is applicable to the in-band full-duplex communication including the first node 101, the second node 102 and the third node 103 in the first to third embodiments. In the industrial communication self-interference estimation system 10. Among them, the first communication interface of the first node 101 may include a first transmitting end 1011 and a first receiving end 1012. The first transmitting end 1011 of the first node 101 transmits the transmission signal to the second node 102, and at the same time, the first transmitting end 1011 of the first node 101 The first receiving end 1012 receives the received signal from the third node 103 .

In step S601, the reference sequence generator 104 generates a reference sequence, and the orthogonal scrambling code generator 105 generates a first orthogonal scrambling code and a second orthogonal scrambling code.

In step S602, the processing unit of the first node 101 can generate a reference signal based on the reference sequence and the first orthogonal scrambling code. More specifically, the reference signal is generated after multiplying the reference sequence and the first orthogonal scrambling code.

In step S603, the first transmitting end 1011 of the first node 101 transmits the reference signal.

In step S604, the first receiving end 1012 of the first node 101 receives the reference signal while receiving the received signal from the third node 103.

In step S605, the self-interference estimation module 106 restores the reference signal based on the second orthogonal scrambling code, and estimates the self-interference of the first node 101 based on the reference signal.

wherein the first orthogonal scrambling code and the second orthogonal scrambling code are selected from an orthogonal scrambling code set or generated using OVSF codes or Walsh codes, and the first orthogonal scrambling code and the second orthogonal scrambling code are substantially orthogonal, The frequencies of the transmit signal, receive signal and reference signal overlap.

Based on the above, the present invention provides an in-band full-duplex communication self-interference estimation system and a method thereof, which are used in the transmission of the first node as an in-band full-duplex device in response to different communication systems such as 5G, LTE, CDMA, Wifi, etc. The end or receiving end generates orthogonal scrambling codes and reference signals, so that the orthogonal scrambling codes are substantially orthogonal to each other, which can effectively improve the self-interference estimation problem of base stations or devices in wireless communication systems in in-band full-duplex mode. .

Although the disclosure has been disclosed above through embodiments, they are not intended to limit the disclosure. Anyone with ordinary knowledge in the technical field may make slight changes and modifications without departing from the spirit and scope of the disclosure. Therefore, The scope of protection of this disclosure shall be determined by the scope of the appended patent application.

10: In-band full-duplex communication self-interference estimation system

101: first node

102: Second node

103: The third node

104: Reference sequence generator

105:Orthogonal scrambling code generator

106:Self-interference estimation module

1011: First transmission end

1012: First receiving end

Claims (10)

An in-band full-duplex communication self-interference estimation system is suitable for including at least a first node, a second node and a third node. A first communication interface of the first node at least includes a first transmitter and a A first receiving end, wherein the first transmitting end of the first node transmits a transmission signal to the second node, and at the same time the first receiving end of the first node receives a receiving signal from the third node, the The system includes: an orthogonal scrambling code generator for generating a first orthogonal scrambling code and a second orthogonal scrambling code; a reference sequence generator for generating a reference sequence; wherein, the first transmitting end Transmitting a reference signal generated based on the reference sequence and the first orthogonal scrambling code, the first receiving end receives the reference signal while receiving the received signal from the third node; and a self-interference estimation module, for The reference signal is restored based on the second orthogonal scrambling code, and the self-interference of the first node is estimated based on the reference signal. The in-band full-duplex communication self-interference estimation system as claimed in claim 1, wherein the first orthogonal scrambling code and the second orthogonal scrambling code are selected from an orthogonal scrambling code set or generated using OVSF codes or Walsh codes. , and the first orthogonal scrambling code and the second orthogonal scrambling code are substantially orthogonal. The in-band full-duplex communication self-interference estimation system as claimed in claim 1, wherein the operation of the first transmitting end transmitting the reference signal generated based on the reference sequence and the first orthogonal scrambling code further includes: The first transmitting end transmits the reference signal generated by multiplying the reference sequence and the first orthogonal scrambling code. The in-band full-duplex communication self-interference estimation system as claimed in claim 1, wherein the frequencies of the transmission signal, the reception signal and the reference signal overlap. The in-band full-duplex communication self-interference estimation system as claimed in claim 1, wherein the first node is a full-duplex device, the second node and the third node are full-duplex devices or half-duplex devices. . An in-band full-duplex communication self-interference estimation method, suitable for at least one first node, a second node and a third node. A first communication interface of the first node at least includes a first transmitter and a A first receiving end, wherein the first transmitting end of the first node transmits a transmission signal to the second node, and at the same time the first receiving end of the first node receives a receiving signal from the third node, the The method includes: generating a reference sequence and generating a first orthogonal scrambling code and a second orthogonal scrambling code; generating a reference signal based on the reference sequence and the first orthogonal scrambling code; transmitting the first transmitting end a reference signal; the first receiving end receives the reference signal while receiving the received signal from the third node; and restores the reference signal based on the second orthogonal scrambling code, and estimates the first node based on the reference signal of self-interference. The self-interference estimation method for in-band full-duplex communication as described in claim 6, wherein the first orthogonal scrambling code and the second orthogonal scrambling code are selected from an orthogonal scrambling code set or generated using OVSF codes or Walsh codes. , and the first orthogonal scrambling code and the second orthogonal scrambling code are substantially orthogonal. The self-interference estimation method for in-band full-duplex communication as described in claim 6, wherein the step of generating the reference signal based on the reference sequence and the first orthogonal scrambling code further includes: combining the reference sequence with the first orthogonal scrambling code. The reference signal is generated by multiplying the orthogonal scrambling codes. The self-interference estimation method for in-band full-duplex communication as described in claim 6, wherein the frequencies of the transmission signal, the reception signal and the reference signal overlap. The in-band full-duplex communication self-interference estimation method as described in claim 6, wherein the first node is a full-duplex device, the second node and the third node are full-duplex devices or half-duplex devices. .

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