JP2006527952A - 自己回帰チャネルモデル化を用いて搬送周波数オフセットとフェージング・レートとを推定する方法および装置 - Google Patents
自己回帰チャネルモデル化を用いて搬送周波数オフセットとフェージング・レートとを推定する方法および装置 Download PDFInfo
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- 230000008569 process Effects 0.000 claims description 5
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0224—Channel estimation using sounding signals
- H04L25/0228—Channel estimation using sounding signals with direct estimation from sounding signals
- H04L25/023—Channel estimation using sounding signals with direct estimation from sounding signals with extension to other symbols
- H04L25/0236—Channel estimation using sounding signals with direct estimation from sounding signals with extension to other symbols using estimation of the other symbols
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- 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
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0026—Transmission of channel quality indication
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- 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
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0036—Systems modifying transmission characteristics according to link quality, e.g. power backoff arrangements specific to the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0212—Channel estimation of impulse response
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0222—Estimation of channel variability, e.g. coherence bandwidth, coherence time, fading frequency
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- 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
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
- H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
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- 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
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
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- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
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- Monitoring And Testing Of Transmission In General (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
Claims (13)
- 通信チャネル(22)の変動特性に対して適合化を行う際に利用する情報の出力時に、無線通信システムの受信機(23)が利用する方法であって、該通信チャネル(22)を介して該受信機(23)が1つの搬送周波数で信号を受信し、該搬送周波数の受信に適した周波数に最初に同調された局部周波数で発振を行う局部発振器を該受信機(23)が備えてなる方法において、
前記受信信号から抽出した受信信号サンプルに応じて、かつ、送信されたシンボルに対応して、前記通信チャネル(22)が、確率過程の結果として、時間経過と共にどのように変動するかという所定のパラメトリック・モデルに基づいて、前記変動する通信チャネル(22)を表わす自己回帰パラメータの推定値を出力するステップ(23b−1b、23b−2b)と、
前記自己回帰パラメータの前記推定値に応じて、チャネルインパルス応答の推定値と、少なくとも1つのマルチパス信号の周波数オフセットの推定値とを出力するステップ(23b−1c、23b−2c)とを特徴とする方法。 - 自己回帰パラメータの前記推定値が期待値の最大化推定値である請求項1に記載の方法。
- 前記チャネルインパルス応答の推定値と、少なくとも1つのマルチパス信号の周波数オフセットの推定値とを出力する前記ステップ(23b−1c、23b−2c)において、電力スペクトル密度の推定値も出力する請求項1に記載の方法。
- 前記チャネルインパルス応答の推定値と、少なくとも1つのマルチパス信号の周波数オフセットの推定値とを出力する前記ステップ(23b−1c、23b−2c)において、フェージング・レートの推定値も出力する請求項1に記載の方法。
- 前記チャネルインパルス応答の推定値と、少なくとも1つのマルチパス信号の周波数オフセットの推定値とを出力する前記ステップ(23b−1c、23b−2c)において、前記受信機(23)が、該チャネルインパルス応答の推定値を利用して、前記のオフセットか、前記フェージングレートかの少なくともいずれかを少なくとも1つのマルチパス信号に対して出力する請求項1に記載の方法。
- 前記所定のパラメトリック・モデルが、前記通信チャネル(22)の時間経過に伴う変動を記述する線形方程式を与える自己回帰モデルであり、該方程式のうちの少なくとも1つが、決定論的過程のみに基づいて、前記通信チャネルの次の状態を前回の状態から決定する際に用いる決定論的モデル行列を含み、さらに、前記オフセットか、前記フェージング・レートかの少なくともいずれかを該決定論的モデル行列から取得するステップをさらに特徴とする請求項1に記載の方法。
- 反復期待値最大化方法を用いて前記自己回帰パラメータを決定する請求項1に記載の方法。
- 再帰勾配に基づく方法を用いて前記自己回帰パラメータを決定する請求項1に記載の方法。
- 通信チャネル(22)の変動特性に対して適合化を行う際に利用する情報の出力手段を備えた無線通信システムの受信機(23)であり、該通信チャネル(22)を介して1つの搬送周波数で信号を受信する受信機(23)であって、該搬送周波数の受信に適した周波数に最初に同調された局部周波数で発振を行う局部発振器を有する受信機(23)において、
前記受信信号から抽出した受信信号サンプルに応じて、かつ、送信されたシンボルに対応して、前記通信チャネル(22)が、確率過程の結果として、時間経過と共にどのように変動するかという所定のパラメトリック・モデルに基づいて、前記変動する通信チャネル(22)を表わす自己回帰パラメータの推定値を出力する手段(23b−1b、23b−2b)と、
前記自己回帰パラメータの前記推定値に応じて、チャネルインパルス応答の推定値と、少なくとも1つのマルチパス信号の周波数オフセットの推定値とを出力する手段(23b−1c、23b−2c)とを特徴とする受信機。 - 基地送受信局とユーザ装置とを備えた通信システムであって、該基地送受信局とユーザ装置との双方が受信機(23)を備えた通信システムにおいて、双方の受信機(23)が請求項11に記載の受信機であり、したがって該受信機が、通信チャネル(22)の変動するパラメータに応じて調整する時の利用情報を出力することを特徴とする通信システム。
- 基地送受信局とユーザ装置とを備えた通信システムであって、該基地送受信局とユーザ装置との双方が受信機(23)を備えた通信システムにおいて、双方の受信機(23)が請求項11に記載の受信機であり、したがって該受信機が、通信チャネル(22)の変動するパラメータに応じて調整する時の利用情報を出力し、さらに、フェージング・レートの推定値を出力する手段(23b−1c、23b−2c)をさらに備え、前記基地送受信局と前記ユーザ装置との双方が、前記通信チャネル(22)の変動するパラメータに応じて調整する時の前記情報に応答する送信機(21)も備えることを特徴とする通信システム。
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US10/464,061 US6868276B2 (en) | 2003-06-17 | 2003-06-17 | Method and apparatus for estimating carrier frequency offset and fading rate using autoregressive channel modeling |
PCT/IB2004/001549 WO2004112295A2 (en) | 2003-06-17 | 2004-05-13 | Method and apparatus for estimating carrier frequency offset and fading rate using autoregressive channel modeling |
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JP2006527952A true JP2006527952A (ja) | 2006-12-07 |
JP4142715B2 JP4142715B2 (ja) | 2008-09-03 |
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JP2006516499A Expired - Fee Related JP4142715B2 (ja) | 2003-06-17 | 2004-05-13 | 自己回帰チャネルモデル化を用いて搬送周波数オフセットとフェージング・レートとを推定する方法および装置 |
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US (1) | US6868276B2 (ja) |
EP (1) | EP1639731A4 (ja) |
JP (1) | JP4142715B2 (ja) |
CN (1) | CN1809977A (ja) |
AR (1) | AR044663A1 (ja) |
MY (1) | MY135625A (ja) |
TW (1) | TWI252629B (ja) |
WO (1) | WO2004112295A2 (ja) |
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US20060072449A1 (en) * | 2004-10-06 | 2006-04-06 | Mark Kent | Method and system for channel equalization |
US7680218B2 (en) * | 2005-10-25 | 2010-03-16 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and apparatus for communication channel estimation |
US7409015B1 (en) * | 2005-11-29 | 2008-08-05 | The United States As Represented By The Secretary Of The Army | Adaptive modulation scheme based on cutoff rate with imperfect channel state information |
FI20055711A0 (fi) * | 2005-12-29 | 2005-12-29 | Nokia Corp | Häiriön poisto radiovastaanottimessa |
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US8009727B2 (en) * | 2007-02-20 | 2011-08-30 | Telefonaktiebolaget Lm Ericsson (Publ) | Equalizer for single carrier FDMA receiver |
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DE102007044671B4 (de) * | 2007-09-18 | 2013-02-21 | Deutsches Zentrum für Luft- und Raumfahrt e.V. | Verfahren zur Schätzung von Parametern eines in einer dynamischen Mehrwegeumgebung empfangenen GNSS-Navigationssignals |
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CN101937073B (zh) * | 2009-06-30 | 2012-11-28 | 凹凸电子(武汉)有限公司 | Gps卫星的载波频率检测方法和装置及gps接收机 |
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FR3034274B1 (fr) * | 2015-03-27 | 2017-03-24 | Stmicroelectronics Rousset | Procede de traitement d'un signal analogique issu d'un canal de transmission, en particulier un signal vehicule par courant porteur en ligne |
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US6868276B2 (en) | 2005-03-15 |
CN1809977A (zh) | 2006-07-26 |
JP4142715B2 (ja) | 2008-09-03 |
WO2004112295A3 (en) | 2005-03-31 |
AR044663A1 (es) | 2005-09-21 |
WO2004112295A2 (en) | 2004-12-23 |
EP1639731A4 (en) | 2012-01-25 |
EP1639731A2 (en) | 2006-03-29 |
TWI252629B (en) | 2006-04-01 |
US20040259514A1 (en) | 2004-12-23 |
MY135625A (en) | 2008-05-30 |
TW200509550A (en) | 2005-03-01 |
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