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WO2004086642A1 - Apparatus for selecting cdma reverse link signal - Google Patents

Apparatus for selecting cdma reverse link signal Download PDF

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Publication number
WO2004086642A1
WO2004086642A1 PCT/KR2004/000651 KR2004000651W WO2004086642A1 WO 2004086642 A1 WO2004086642 A1 WO 2004086642A1 KR 2004000651 W KR2004000651 W KR 2004000651W WO 2004086642 A1 WO2004086642 A1 WO 2004086642A1
Authority
WO
WIPO (PCT)
Prior art keywords
signals
signal
conversion devices
cdma reverse
cdma
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/KR2004/000651
Other languages
French (fr)
Inventor
Woo Jae Lee
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.)
UTStarcom Korea Ltd
Original Assignee
UTStarcom Korea Ltd
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 UTStarcom Korea Ltd filed Critical UTStarcom Korea Ltd
Priority to EP04723091A priority Critical patent/EP1614228A1/en
Publication of WO2004086642A1 publication Critical patent/WO2004086642A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2628—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using code-division multiple access [CDMA] or spread spectrum multiple access [SSMA]
    • H04B7/2634—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using code-division multiple access [CDMA] or spread spectrum multiple access [SSMA] for channel frequency control
    • 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

Definitions

  • the present invention relates to an apparatus for selecting CDMA (Code Division Multiple Access) reverse signals by adjusting a level converter in enable/disable mode so that a desired FA (Frequency Assignment) can be applied to a modem chip.
  • the modem chip is capable of receiving signals of a desired FA and demodulating them, and thus the invention can improve various utilizations of a system and selection of a usable FA when establishing the system.
  • the level conversion devices are adjustable in enable/disable mode to activate the level conversion device of a desired FA and receive corresponding FA signals, where the reverse signals transmitted to an IF board are separated to each FA.
  • the object of the present invention is to provide an apparatus for selecting CDMA reverse signals by adjusting CDMA reverse signals transmitted to an IF board by means of a signal level converter having a plurality of level conversion devices, that is, by activating a level conversion device of only a desired FA and disabling the remaining conversion devices to receive signals of the corresponding FA and supply the signals to the modem chip.
  • the modem chip is capable of receiving the signals of the desired FA and demodulating the same, and subsequently the invention can improve various utilizations of a system and selection of a usable FA when establishing the system.
  • the apparatus of the present invention comprises: a modem for demodulating the CDMA reverse signals; a data line as a pathway for receiving the CDMA reverse signals; a signal level converter having a plurality of level conversion devices for changing levels of the received CDMA reverse signals; a signal line as a pathway which is used for controlling the signal level converter to select an FA (Frequency Assignment); and a PLD (Programmable Logic Device) for controlling the operation of the signal level converter through the signal line and generating signals to select the received signals.
  • FA Frequency Assignment
  • PLD Programmable Logic Device
  • one among the plurality of level conversion devices is activated and the other conversion devices are disabled in response to the control signal generated by the PLD, and thereafter, a corresponding FA signal is applied to the modem through the data line.
  • CDMA reverse signals transmitted to an IF board are adjustable by means of a signal level converter having a plurality of level conversion devices, that is, only a level conversion device of a desired FA is activated and other conversion devices are disabled to thereby receive signals of the corresponding FA and supply the signal to the modem chip.
  • the modem chip has the advantage of receiving the signals of the desired FA and demodulating the same.
  • the invention can improve various utilizations of a system, and also provide enhanced system performance by means of selecting a usable FA when establishing the system by correcting contents of the PLD.
  • FIG. 1 shows a block diagram of an apparatus for selecting CDMA reverse signals according to the present invention.
  • Fig. 1 shows a block diagram of the apparatus for selecting CDMA reverse signals according to the present invention.
  • the inventive apparatus comprises modem 100 for demodulating CDMA reverse signals, PLD 200 for generating signals to select receiving signals, data line 300 as a pathway for receiving the CDMA reverse signals, signal line 400 as a signal pathway for controlling a signal level converter to select a FA, and signal level converter 500 including a plurality of signal conversion devices for changing . levels of the received CDMA reverse signals.
  • modem 100 is a block for demodulating the CDMA reverse signals
  • PLD 200 is a block for generating signals to select the receiving signals
  • data line 300 is a pathway for receiving the CDMA reverse signals
  • signal line 400 is a signal pathway for controlling the signal level converter to select FA
  • signal level converter 500 changes the levels of the received CDMA reverse signals and comprises a plurality of level conversion devices.
  • signal line 400 is used to control signal level converter 500.
  • only one among three level conversion devices 510, 520 and 530 is activated, and the remaining ones are disabled in response to the signal generated by PLD 200, and subsequently, the corresponding FA signal is applied to modem 100 through data line 300 thereby achieving the advantage of FA selecting.
  • PLD 200 also includes a function capable of appropriately selecting FA depending on circumstances and conditions of the base station.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

An apparatus selects CDMA (Code Division Multiple Access) reverse signals by adjusting CDMA reverse signals transmitted to an IF (Intermediate Frequency) board by means of a signal level converter having a plurality of level conversion devices, that is, by activating a level conversion device of a desired FA only and disabling other conversion devices to thereby receive signals of the corresponding FA and supply them to the modern chip. By doing so, the modern chip is capable of receiving the receiving signals of desired FA and demodulating them, and subsequently the apparatus can improve various utilizations of a System and selection in a usable FA when establishing the system.

Description

APPARATUS FOR SELECTING CDMA REVERSE LINK SIGNAL
TECHNICAL FIELD
The present invention relates to an apparatus for selecting CDMA (Code Division Multiple Access) reverse signals by adjusting a level converter in enable/disable mode so that a desired FA (Frequency Assignment) can be applied to a modem chip. In particular, an apparatus for selecting CDMA reverse signals by adjusting CDMA reverse signals transmitted to an LF (Intermediate Frequency) board by means of a signal level converter having a plurality of level conversion devices, i.e., by activating a level conversion device of only a desired FA and disabling the remaining level conversion devices to receive corresponding FA signals and supply the signal to the modem chip. By doing so, the modem chip is capable of receiving signals of a desired FA and demodulating them, and thus the invention can improve various utilizations of a system and selection of a usable FA when establishing the system.
BACKGROUND ART
In a general mobile communication system, it has been an essential function of a modem chip to select an FA in a base station, which adopts various FAs. However, the essential function has not been embodied in conventional systems.
Thus, in order to supply only a desired FA to a modem chip, it is essential that the level conversion devices are adjustable in enable/disable mode to activate the level conversion device of a desired FA and receive corresponding FA signals, where the reverse signals transmitted to an IF board are separated to each FA.
DISCLOSURE OF THE INVENTION
The object of the present invention is to provide an apparatus for selecting CDMA reverse signals by adjusting CDMA reverse signals transmitted to an IF board by means of a signal level converter having a plurality of level conversion devices, that is, by activating a level conversion device of only a desired FA and disabling the remaining conversion devices to receive signals of the corresponding FA and supply the signals to the modem chip. By doing so, the modem chip is capable of receiving the signals of the desired FA and demodulating the same, and subsequently the invention can improve various utilizations of a system and selection of a usable FA when establishing the system. To accomplish said object, the apparatus of the present invention comprises: a modem for demodulating the CDMA reverse signals; a data line as a pathway for receiving the CDMA reverse signals; a signal level converter having a plurality of level conversion devices for changing levels of the received CDMA reverse signals; a signal line as a pathway which is used for controlling the signal level converter to select an FA (Frequency Assignment); and a PLD (Programmable Logic Device) for controlling the operation of the signal level converter through the signal line and generating signals to select the received signals.
Further, to accomplish the object of the present invention, one among the plurality of level conversion devices is activated and the other conversion devices are disabled in response to the control signal generated by the PLD, and thereafter, a corresponding FA signal is applied to the modem through the data line.
According to the present invention, CDMA reverse signals transmitted to an IF board are adjustable by means of a signal level converter having a plurality of level conversion devices, that is, only a level conversion device of a desired FA is activated and other conversion devices are disabled to thereby receive signals of the corresponding FA and supply the signal to the modem chip. By doing so, the modem chip has the advantage of receiving the signals of the desired FA and demodulating the same. Further, the invention can improve various utilizations of a system, and also provide enhanced system performance by means of selecting a usable FA when establishing the system by correcting contents of the PLD.
BRIEF DESCRIPTION OF DRAWING Fig. 1 shows a block diagram of an apparatus for selecting CDMA reverse signals according to the present invention.
BEST MODE FOR CARRYING OUT THE INVENTION
The preferred embodiment of the present invention according to the above- mentioned technical features of the present invention is described below, together with drawings.
Fig. 1 shows a block diagram of the apparatus for selecting CDMA reverse signals according to the present invention.
As shown, the inventive apparatus comprises modem 100 for demodulating CDMA reverse signals, PLD 200 for generating signals to select receiving signals, data line 300 as a pathway for receiving the CDMA reverse signals, signal line 400 as a signal pathway for controlling a signal level converter to select a FA, and signal level converter 500 including a plurality of signal conversion devices for changing . levels of the received CDMA reverse signals.
In other words, modem 100 is a block for demodulating the CDMA reverse signals, PLD 200 is a block for generating signals to select the receiving signals, data line 300 is a pathway for receiving the CDMA reverse signals, signal line 400 is a signal pathway for controlling the signal level converter to select FA, and signal level converter 500 changes the levels of the received CDMA reverse signals and comprises a plurality of level conversion devices. In particular, as illustrated in Fig. 1, signal line 400 is used to control signal level converter 500. Further, only one among three level conversion devices 510, 520 and 530 is activated, and the remaining ones are disabled in response to the signal generated by PLD 200, and subsequently, the corresponding FA signal is applied to modem 100 through data line 300 thereby achieving the advantage of FA selecting.
Further, PLD 200 also includes a function capable of appropriately selecting FA depending on circumstances and conditions of the base station.
Since the present invention was described with respect to a particular embodiment of the apparatus of selecting CDMA reverse signal, it will be apparent - to those skilled in the art that many changes and modifications may be made without departing from the scope of the invention as defined in the appended claims and those equivalent thereto.

Claims

1. An apparatus for selecting CDMA (Code Division Multiple Access) reverse signals comprising: a modem for demodulating the CDMA reverse signals; a data line as a pathway for receiving the CDMA reverse signals; a signal level converter having a plurality of level conversion devices for changing levels of the received CDMA reverse signals; a signal line as a pathway which is used for controlling the signal level converter to select an FA (Frequency Assignment); and a PLD (Programmable Logic Device) for controlling the operation of the signal level converter through the signal line and generating signals to select the received signals.
2. The apparatus of Claim 1 , wherein one among the plurality of level conversion devices is activated and the other conversion devices are disabled in response to the control signal generated by the PLD, and thereafter, a corresponding FA signal is applied to the modem through the data line.
PCT/KR2004/000651 2003-03-25 2004-03-24 Apparatus for selecting cdma reverse link signal Ceased WO2004086642A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP04723091A EP1614228A1 (en) 2003-03-25 2004-03-24 Apparatus for selecting cdma reverse link signal

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020030018548A KR20040083863A (en) 2003-03-25 2003-03-25 Apparatus for selecting of CDMA reverse link signal
KR10-2003-0018548 2003-03-25

Publications (1)

Publication Number Publication Date
WO2004086642A1 true WO2004086642A1 (en) 2004-10-07

Family

ID=33095559

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2004/000651 Ceased WO2004086642A1 (en) 2003-03-25 2004-03-24 Apparatus for selecting cdma reverse link signal

Country Status (3)

Country Link
EP (1) EP1614228A1 (en)
KR (1) KR20040083863A (en)
WO (1) WO2004086642A1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5551064A (en) * 1994-07-27 1996-08-27 Motorola, Inc. Method and apparatus for communication unit frequency assignment
US5740534A (en) * 1996-02-22 1998-04-14 Motorola, Inc. Method for determining available frequencies in selective call receivers
US6002934A (en) * 1997-05-02 1999-12-14 Gte Laboratories Incorporated Methods and apparatus for assigning frequencies in a cellular network

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5551064A (en) * 1994-07-27 1996-08-27 Motorola, Inc. Method and apparatus for communication unit frequency assignment
US5740534A (en) * 1996-02-22 1998-04-14 Motorola, Inc. Method for determining available frequencies in selective call receivers
US6002934A (en) * 1997-05-02 1999-12-14 Gte Laboratories Incorporated Methods and apparatus for assigning frequencies in a cellular network

Also Published As

Publication number Publication date
EP1614228A1 (en) 2006-01-11
KR20040083863A (en) 2004-10-06

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