JP2007516638A - 局所供給レプリカを利用してサンプル直接シーケンス拡散スペクトル信号を補正する方法 - Google Patents
局所供給レプリカを利用してサンプル直接シーケンス拡散スペクトル信号を補正する方法 Download PDFInfo
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- JP2007516638A JP2007516638A JP2006520033A JP2006520033A JP2007516638A JP 2007516638 A JP2007516638 A JP 2007516638A JP 2006520033 A JP2006520033 A JP 2006520033A JP 2006520033 A JP2006520033 A JP 2006520033A JP 2007516638 A JP2007516638 A JP 2007516638A
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- 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
- H04B1/7073—Synchronisation aspects
- H04B1/7075—Synchronisation aspects with code phase acquisition
-
- 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
- H04B1/709—Correlator structure
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Position Fixing By Use Of Radio Waves (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
Abstract
Description
code = GenerateNextCodeBit()
carrier = GenerateNextCarrierPhase()
IFsample = GetNextIFsample()
Isum = Isum + IFsample XOR (code XOR cos(carrier))
Qsum = Qsum + IFsample XOR (code XOR sin(carrier))
もし複雑なGPS IF信号サンプルストリームが使用されるならば、より洗練された設計が使用され得るが、原理はおおよそ同一であるということに注意されたい。
for bit = 0 to 31 {
codeWord[bit] = GenerateCodeBit()
phase = GenerateCarrierPhase()
IcarrierWord[bit] = cos(phase)
QcarrierWord[bit] = sin(phase)
IFWord[bit] = GetNextIFsample()
}
IWord = IFWord XOR codeWord XOR IcarrierWord
QWord = IFWord XOR codeWord XOR QcarrierWord
Isum = Isum + CountBitsSet(IWord)
Qsum = Qsum + CountBitsSet(QWord)
このアプローチの変形が、ゲインはより小さくなり得るが、マルチビットサンプリングに使用され得ることは注目に値する。1.5ビットサンプリングの特殊な場合(即ち1、0、−1の値)については、符号及び大きさワードを分離しておき、当該符号ワードを1ビットの値として処理するが、大きさワードをビットカウント演算におけるマスクとして使用することにより、明確にサポートされ得る。
Claims (11)
- 拡散コードを包含している局所供給レプリカ信号を利用してサンプル直接シーケンス拡散スペクトル信号を補正する方法であって、
第1のワードを形成するように、受信信号の少なくとも2つの信号サンプルの1又は2以上のビットを結合するステップと、
レプリカ信号に対応した2以上のビットを包含している第2のワードを供給するステップと、
補正値を取得するために、前記第1及び第2のワードを処理するように1又は2以上のソフトウェアベースの指示を実行するステップとを備える方法。 - 前記第1及び第2のワードの前記処理は、ハードワイヤによる回路構成を使用して実施される請求項1に記載の方法。
- 前記第1及び第2のワードの前記処理は、ワードベースのXOR演算又はその反転及びその演算の結果の合計を包含する請求項1に記載の方法。
- ソフトウェアベースの指示が、前記第1のワードを形成するように実行される請求項1に記載の方法。
- 前記拡散スペクトル信号の各サンプルが、少なくとも1の大きさビット及び1の符号ビットを包含し、前記第1のワードが、少なくとも2つの信号サンプルの1又は2以上の前記大きさビットを結合することにより形成され、第3のワードが、少なくとも2つの信号サンプルの1の前記符号ビットを結合することにより形成され、1又は2以上のソフトウェアベースの指示が、補正値を取得するために、前記第1、第2、及び第3のワードを処理するように実行される請求項1に記載の方法。
- 第1のワードを形成するように、受信信号の少なくとも2つの信号サンプルの1又は2以上のビットを結合し、レプリカ信号に対応した2以上のビットを包含している第2のワードを供給し、補正値を取得するために、前記第1及び第2のワードを処理するように1又は2以上のソフトウェアベースの指示を実行することにより、
拡散コードを包含している局所供給レプリカ信号を利用してサンプル直接シーケンス拡散スペクトル信号を補正する、ように構成されている信号プロセッサ。 - 前記第1及び第2のワードの前記処理は、ハードワイヤによる回路構成を使用して実施される請求項6に記載の信号プロセッサ。
- 前記第1及び第2のワードの前記処理は、ワードベースのXOR演算又はその反転及びその演算の結果の合計を包含する請求項6に記載の信号プロセッサ。
- ソフトウェアベースの指示が、前記第1のワードを形成するように実行される請求項6に記載の信号プロセッサ。
- 前記拡散スペクトル信号の各サンプルが、少なくとも1の大きさビット及び1の符号ビットを包含し、前記第1のワードが、少なくとも2つの信号サンプルの1又は2以上の前記大きさビットを結合することにより形成され、第3のワードが、少なくとも2つの信号サンプルの1の前記符号ビットを結合することにより形成され、1又は2以上のソフトウェアベースの指示が、補正値を取得するために、前記第1、第2、及び第3のワードを処理するように実行される請求項6に記載の信号プロセッサ。
- 直接シーケンス拡散スペクトル信号の受信機であって、
拡散スペクトル信号を受信して、対応する信号サンプルを出力するためのアナログデジタル変換器、を包含するアンテナ及び無線周波数フロントエンドと、請求項6乃至10のいずれか1項に記載の信号プロセッサとを備える受信機。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GBGB0316608.9A GB0316608D0 (en) | 2003-07-16 | 2003-07-16 | A method of correlating a sampled direct sequence spread spectrum signal with a locally provided replica |
PCT/IB2004/002278 WO2005008909A1 (en) | 2003-07-16 | 2004-07-12 | A method of correlating a sampled direct sequence spread spectrum signal with a locally provided replica |
Publications (3)
Publication Number | Publication Date |
---|---|
JP2007516638A true JP2007516638A (ja) | 2007-06-21 |
JP2007516638A5 JP2007516638A5 (ja) | 2010-06-24 |
JP4642759B2 JP4642759B2 (ja) | 2011-03-02 |
Family
ID=27763903
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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JP2006520033A Expired - Fee Related JP4642759B2 (ja) | 2003-07-16 | 2004-07-12 | サンプル直接シーケンス拡散スペクトル信号と局所供給レプリカとの相関をとる方法 |
Country Status (9)
Country | Link |
---|---|
US (1) | US20060222057A1 (ja) |
EP (1) | EP1649607B1 (ja) |
JP (1) | JP4642759B2 (ja) |
KR (1) | KR101088536B1 (ja) |
CN (1) | CN100521564C (ja) |
AT (1) | ATE431013T1 (ja) |
DE (1) | DE602004020996D1 (ja) |
GB (1) | GB0316608D0 (ja) |
WO (1) | WO2005008909A1 (ja) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2781031B1 (en) * | 2011-11-16 | 2019-05-15 | NXP USA, Inc. | Direct sequence spread spectrum signal receiving device and method |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH0758669A (ja) * | 1993-08-11 | 1995-03-03 | Fujitsu Ltd | デジタルマッチドフィルタ |
JPH10173632A (ja) * | 1996-12-10 | 1998-06-26 | Matsushita Electric Ind Co Ltd | 受信装置 |
JP2001504655A (ja) * | 1996-11-14 | 2001-04-03 | エリクソン インコーポレイテッド | 直接シーケンススペクトル拡散通信信号の逆拡散 |
US20010048713A1 (en) * | 1999-12-30 | 2001-12-06 | Medlock Joel D. | Fast initial acquisition & search device for a spread spectrum communication system |
JP2002077103A (ja) * | 2000-09-05 | 2002-03-15 | Hitachi Kokusai Electric Inc | Cdma基地局装置 |
JP2002185361A (ja) * | 2000-12-14 | 2002-06-28 | Mitsubishi Cable Ind Ltd | 相関ピーク検出回路 |
JP2007525039A (ja) * | 2003-01-10 | 2007-08-30 | コーネル リサーチ ファンデーション インク. | リアルタイム・ソフトウェア・レシーバ |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5982811A (en) * | 1996-07-12 | 1999-11-09 | General Electric Company | Method for efficient sampling in a correlator |
US6657986B1 (en) * | 1998-07-10 | 2003-12-02 | Hyundai Electronics America | Variable clock rate correlation circuit and method of operation |
EP1387500B1 (en) * | 2002-08-02 | 2007-05-09 | STMicroelectronics Limited | Integrated circuit for GPS code acquisition |
DE10241691A1 (de) * | 2002-09-09 | 2004-03-25 | Infineon Technologies Ag | Einrichtung und Verfahren zur Durchführung von Korrelationen in einem Mobilfunksystem |
-
2003
- 2003-07-16 GB GBGB0316608.9A patent/GB0316608D0/en not_active Ceased
-
2004
- 2004-07-12 WO PCT/IB2004/002278 patent/WO2005008909A1/en active Application Filing
- 2004-07-12 JP JP2006520033A patent/JP4642759B2/ja not_active Expired - Fee Related
- 2004-07-12 DE DE602004020996T patent/DE602004020996D1/de active Active
- 2004-07-12 US US10/564,422 patent/US20060222057A1/en not_active Abandoned
- 2004-07-12 AT AT04743940T patent/ATE431013T1/de not_active IP Right Cessation
- 2004-07-12 CN CNB2004800202703A patent/CN100521564C/zh not_active Expired - Fee Related
- 2004-07-12 EP EP04743940A patent/EP1649607B1/en not_active Not-in-force
- 2004-07-12 KR KR1020067000807A patent/KR101088536B1/ko active IP Right Grant
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0758669A (ja) * | 1993-08-11 | 1995-03-03 | Fujitsu Ltd | デジタルマッチドフィルタ |
JP2001504655A (ja) * | 1996-11-14 | 2001-04-03 | エリクソン インコーポレイテッド | 直接シーケンススペクトル拡散通信信号の逆拡散 |
JPH10173632A (ja) * | 1996-12-10 | 1998-06-26 | Matsushita Electric Ind Co Ltd | 受信装置 |
US20010048713A1 (en) * | 1999-12-30 | 2001-12-06 | Medlock Joel D. | Fast initial acquisition & search device for a spread spectrum communication system |
JP2002077103A (ja) * | 2000-09-05 | 2002-03-15 | Hitachi Kokusai Electric Inc | Cdma基地局装置 |
JP2002185361A (ja) * | 2000-12-14 | 2002-06-28 | Mitsubishi Cable Ind Ltd | 相関ピーク検出回路 |
JP2007525039A (ja) * | 2003-01-10 | 2007-08-30 | コーネル リサーチ ファンデーション インク. | リアルタイム・ソフトウェア・レシーバ |
Also Published As
Publication number | Publication date |
---|---|
WO2005008909A1 (en) | 2005-01-27 |
KR101088536B1 (ko) | 2011-12-05 |
KR20060039902A (ko) | 2006-05-09 |
US20060222057A1 (en) | 2006-10-05 |
JP4642759B2 (ja) | 2011-03-02 |
DE602004020996D1 (de) | 2009-06-18 |
CN1823477A (zh) | 2006-08-23 |
EP1649607A1 (en) | 2006-04-26 |
ATE431013T1 (de) | 2009-05-15 |
GB0316608D0 (en) | 2003-08-20 |
CN100521564C (zh) | 2009-07-29 |
EP1649607B1 (en) | 2009-05-06 |
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