JP2003018046A5 - - Google Patents

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JP2003018046A5
JP2003018046A5 JP2001195685A JP2001195685A JP2003018046A5 JP 2003018046 A5 JP2003018046 A5 JP 2003018046A5 JP 2001195685 A JP2001195685 A JP 2001195685A JP 2001195685 A JP2001195685 A JP 2001195685A JP 2003018046 A5 JP2003018046 A5 JP 2003018046A5
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search
unit
coefficient
integration
shift register
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JP2001195685A
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JP2003018046A (en
JP3918467B2 (en
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CDMAによる下り回線のRF帯域の無線信号を受信するアンテナと、前記アンテナで受信されたRF帯域の無線信号をダウンコンバートおよび帯域制限して出力するRF部と、前記RF部の出力をA/Dコンバートして出力するA/D変換器と、前記A/D変換器の出力を用いてセルサーチおよびパスサーチを行うサーチ部と、該サーチ部のサーチ結果を利用して受信信号の復調を行う復調部とを有するCDMA受信装置であって、
前記サーチ部は、下り回線に含まれるセルサーチ用チャネルとパスサーチ用チャネルとで変調方式が異なるCDMAセルラシステムにおいて、セルサーチに用いるマッチドフィルタとパスサーチに用いるマッチドフィルタを時分割で共用するにあたり、セルサーチ時とパスサーチ時とでマッチドフィルタのタップ長を異ならせてサーチすることを特徴とするCDMA受装置
An antenna that receives a radio signal in the RF band of the downlink by CDMA, an RF unit that outputs a radio signal in the RF band that is received by the antenna by down-conversion and band limitation, and an output of the RF unit is A / D An A / D converter that converts and outputs, a search unit that performs cell search and path search using the output of the A / D converter, and a received signal is demodulated using the search result of the search unit A CDMA receiver having a demodulation unit,
In the CDMA cellular system in which the modulation method is different between the cell search channel and the path search channel included in the downlink , the search unit shares the matched filter used for the cell search and the matched filter used for the path search by time division. , CDM a receiving apparatus characterized by searching with different tap lengths of the matched filter at the time of cell search and path search time.
請求項1記載のCDMA受信装置であって、該CDMAセルラシステムは、基地局間非同期セルラシステムであることを特徴とするCDMA受装置 A CDMA receiving apparatus according to claim 1, said CDMA cellular system, CDM A receiving apparatus, characterized in that an asynchronous cellular system between base stations. 請求項1記載のCDMA受信装置であって、該CDMAセルラシステムは、セルサーチ用チャネルがBPSK変調方式、パスサーチ用チャネルがBPSK変調方式以外(例えばQPSK変調)で変調されており、セルサーチ時はパスサーチ時におけるタップ長の2倍の長さをもってサーチすることを特徴とするCDMA受装置2. The CDMA receiver according to claim 1 , wherein the cell search channel is modulated by a BPSK modulation method, and the path search channel is modulated by a method other than the BPSK modulation method (for example, QPSK modulation). CDM a receiving apparatus characterized by searching with the tap length twice the length of at path search. 請求項1記載のCDMA受信装置であって、前記サーチ部は、前記A/D変換器からの出力信号である受信データが入力されるシフトレジスタと、第1および第2の積算部とを有し、
前記セルサーチを行う場合には、前記シフトレジスタから、前記第1の積算部には該シフトレジスタに格納される受信データのうちの第1の部分データを入力し、前記第2の積算部には該シフトレジスタに格納される受信データのうちの第2の部分データを入力し、
前記第1の積算部は、セルサーチ用拡散符号のうち第1の部分系列を係数として該係数と前記第1の部分データとの積算結果を出力し、
前記第2の積算部は、セルサーチ用拡散符号のうち第2の部分系列を係数として該係数と前記第2の部分データとの積算結果を出力し、
前記第1および第2の積算部の出力の和を相関結果として出力し、
前記パスサーチを行う場合には、前記シフトレジスタから、前記第1および第2の積算部に該シフトレジスタに格納される受信データの一部である同じ部分データを入力し、
前記第1の積算部は、パスサーチ用拡散符号のうちのI成分の系列を係数として該係数と前記部分データとの積算結果をI成分の相関結果として出力し、
前記第2の積算部は、パスサーチ用拡散符号のうちのQ成分の系列を係数として該係数と前記部分データとの積算結果をQ成分の相関結果として出力することを特徴とするCDMA受信装置。
2. The CDMA receiver according to claim 1, wherein the search unit includes a shift register to which reception data that is an output signal from the A / D converter is input, and first and second integration units. And
When performing the cell search, the first partial data of the received data stored in the shift register is input from the shift register to the first integrating unit, and the second integrating unit is input to the second integrating unit. Inputs the second partial data of the received data stored in the shift register,
The first integration unit outputs an integration result of the coefficient and the first partial data using the first partial sequence of the cell search spreading code as a coefficient,
The second integration unit outputs the integration result of the coefficient and the second partial data using the second partial sequence of the cell search spreading code as a coefficient,
Outputting the sum of the outputs of the first and second integrating units as a correlation result;
When performing the path search, the same partial data that is a part of the received data stored in the shift register is input from the shift register to the first and second integration units,
The first integrating unit outputs an integration result of the coefficient and the partial data as a correlation result of the I component using a sequence of the I component of the spread code for path search as a coefficient,
The second integrating unit outputs a result of integrating the coefficient and the partial data as a Q component correlation result using a Q component sequence of the path search spreading code as a coefficient. .
JP2001195685A 2001-06-28 2001-06-28 CDMA baseband receiver circuit Expired - Fee Related JP3918467B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2001195685A JP3918467B2 (en) 2001-06-28 2001-06-28 CDMA baseband receiver circuit

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Application Number Priority Date Filing Date Title
JP2001195685A JP3918467B2 (en) 2001-06-28 2001-06-28 CDMA baseband receiver circuit

Publications (3)

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JP2003018046A JP2003018046A (en) 2003-01-17
JP2003018046A5 true JP2003018046A5 (en) 2005-06-23
JP3918467B2 JP3918467B2 (en) 2007-05-23

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JP2001195685A Expired - Fee Related JP3918467B2 (en) 2001-06-28 2001-06-28 CDMA baseband receiver circuit

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101651641A (en) * 2008-08-13 2010-02-17 中兴通讯股份有限公司 Circuit device and method for matched filtering in baseband processing system of terminal equipment

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