JP4099191B2 - チャネル推定装置およびチャネル推定方法 - Google Patents
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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
- H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
- H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
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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
- H04L25/0204—Channel estimation of multiple channels
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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
- H04L25/022—Channel estimation of frequency 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
- H04L25/0224—Channel estimation using sounding signals
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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
- H04L25/024—Channel estimation channel estimation algorithms
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
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Description
1.NT個の重ね合わせ信号の分離処理
2. Dt またはDfが1以上である場合の補間処理
3.相関H^lDt,^iDf (μ,ν)に基づく雑音N^lDt,^iDfの平均化処理
S. Weinstein and P. Ebert著、 "Data Transmission by Frequency Division Multiplexing Using the Discrete Fourier Transform", IEEE Transactions on Communication Technology, vol. COM-19, pp. 628-634, Oct. 1971 K. Fazel and L. Papke著, "On the Performance of Convolutionally-Coded CDMA/OFDM for Mobile Communication Systems", in Proc. IEEE Int. Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC'93), Yokohama, Japan, pp. 468-472, Sep. 1993 H. Atarashi and M. Sawahashi著, "Variable Spreading Factor Orthogonal Frequency and Code Division Multiplexing (VSF-OFCDM)", in 3rd International Workshop on Multi-Carrier Spread-Spectrum & Related Topics (MC-SS 2001), Oberpfaffenhofen, Germany, Sep. 2001 Y. Gong and K. Letaief著: "Low Rank Channel Estimation for Space-Time Coded Wideband OFDM Systems," in Proc. IEEE Vehicular Technology Conference (VTC'2001-Fall), Atlantic City, USA, pp. 722-776, 2001 I. Barhumiら著: " Optimal training sequences for channel estimation in MIMO OFDM systems immobile wireless channels", International Zurich Seminar on Broadband Communications (IZS02), February, 2002 Yi Gongら著: "Low Rank Channel Estimation for Space-Time Coded Wideband OFDM systems", IEEE Vehicular Technology Conference, VTC 2001- Fall, vol. 2, pp. 772-776, Sept. 2001 Y. Li著:"Simplified Channel Estimation for OFDM Systems with Multiple Transmit Antennas," IEEE Transactions on Wireless Communications, vol. 1, pp. 67-75, Jan. 2002
Claims (9)
- 空間的に離れた2以上の送信地点が存在し、前記2以上の送信地点の各々は複数のパイロット列のうちの対応する1のパイロット列と関連付けられ、前記複数のパイロット列は任意の2つのパイロット列の内積の絶対値が0以上0.2以下で定義される直交性範囲内で互いに直交する環境において、1の送信地点から1の受信地点に至るチャネルを推定する装置であって、
前記複数の送信地点から送信された複数の信号の重ね合わせを含む入力信号を提供する提供器(107)と、
前記複数の送信地点の数に等しい数だけ前記入力信号の複製を提供する乗算器(109)と、
前記入力信号の複製の位相シフトを時間遅延に変換するためにフーリエ変換に基づく変換アルゴリズムを適用する機能を有し、前記入力信号の複製の各々に対し、前記複製または当該複製から得られる信号を変換して変換後の信号を得る変換器(115、117;317、319)と、
対応する変換器(115、117;317、319)のみから提供された変換後の信号のみを受信する機能を有し、前記変換後の信号の各々に対し、前記変換後の信号からその一部分を抽出し、推定対象のチャネルの推定チャネルインパルス応答を取得する抽出器(119、121)と
を有し、
前記乗算器(109)と前記変換器(115、117;317、319)との間に、前記複製から抽出された信号を生成するための前置乗算器(201、207;301、303)が接続され、
前記前置乗算器は、前記変換器から出力された信号を用いて推定されるべきチャネルを規定している送信地点に対応したパイロット列の複素共役を、入力信号に乗じる
ことを特徴とするチャネル推定装置。 - 前記パイロット列は互いに位相がシフトしており、
前記抽出器(119、121)の各々について、対応する抽出器(119、121)にて抽出された前記一部に対し、他のパイロット列に関する情報を用いずに、演算処理を実行する演算手段(211、213)を更に有する
ことを特徴とする請求項1に記載のチャネル推定装置。 - 前記演算手段(211、213)は、所定のフィルタ係数を有する推定フィルタ(321、323)を備え、前記推定チャネルインパルス応答を出力する機能を有し、
前記フィルタ係数は、同一の前記抽出器(119、121)から抽出された部分に基づき複数の時刻において繰り返し変更される
ことを特徴とする請求項2に記載のチャネル推定装置。 - 前記演算手段(211、213)は、前記推定インパルス応答または前記拡張推定チャネルインパルス応答に対しゼロパディング処理を行って所定の長さにするゼロパディング器(325、327)を有する
ことを特徴とする請求項2または3に記載のチャネル推定装置。 - 前記演算手段(211、213)は、ゼロパディングされた推定チャネルインパルス応答またはゼロパディングされた拡張推定チャネルインパルス応答を変換し、前記推定対象のチャネルのチャネル伝達関数を出力する変換器(329、331)を更に有する
ことを特徴とする請求項4に記載のチャネル推定装置。 - 後段の変換におけるリーケージ効果を緩和するために、前記各複製または当該各複製から得られる信号に対し窓処理を行う周波数ドメインウィンドウ(313、315)と、
前記ゼロパディングされた、推定チャネルインパルス応答または拡張推定チャネルインパルス応答に対し、窓処理を行い、前記チャネル伝達関数における前記周波数ドメインウィンドウ(313、315)に起因した影響を緩和させるインバースウィンドウ(333、335)と、
を更に備えることを特徴とする請求項4に記載のチャネル推定装置。 - 前記抽出器(119、121)は、前記変換された信号のうちで所定の閾値以上の値を持つ信号から値を抽出する
ことを特徴とする請求項1ないし4のいずれかに記載のチャネル推定装置。 - 空間的に離れた2以上の送信地点が存在し、前記2以上の送信地点の各々は複数のパイロット列のうちの対応する1のパイロット列と関連付けられ、前記複数のパイロット列は任意の2つのパイロット列の内積の絶対値が0以上0.2以下で定義される直交性範囲内で互いに直交する環境において、1の送信地点から1の受信地点に至るチャネルを推定する方法であって、
前記複数の送信地点から送信された複数の信号の重ね合わせを含む入力信号を提供するステップと、
前記複数の送信地点の数に等しい数だけ前記入力信号の複製を提供する乗算ステップと、
前記入力信号の複製の各々に対し、前記入力信号の複製の位相シフトを時間遅延に変換するためにフーリエ変換に基づく変換アルゴリズムを適用することにより、前記複製または当該複製から得られる信号を変換して変換後の信号を得る変換ステップと、
前記変換後の信号の各々に対し、対応する変換後の信号のみを受信し、前記変換後の信号からその一部分を抽出して推定対象のチャネルの推定チャネルインパルス応答を取得するステップと
を有するチャネル推定方法であって、
前記乗算ステップにて出力された信号に基づき、前記複製から抽出された信号を生成する前置乗算ステップとを更に有し、
前記前置乗算ステップにおいては、前記変換ステップから出力された信号を用いて推定されるチャネルを規定している送信地点に対応したパイロット列の複素共役を、入力信号に乗じる
ことを特徴とするチャネル推定方法。 - コンピュータにて実行されると請求項8に記載のチャネル推定方法を実行するプログラムコードを有する
ことを特徴とするコンピュータプログラム。
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CN115694767B (zh) * | 2022-10-27 | 2023-07-14 | 南通大学 | 一种基于Transformer的联合导频设计、反馈和信道估计方法 |
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US6317411B1 (en) * | 1999-02-22 | 2001-11-13 | Motorola, Inc. | Method and system for transmitting and receiving signals transmitted from an antenna array with transmit diversity techniques |
US6850481B2 (en) * | 2000-09-01 | 2005-02-01 | Nortel Networks Limited | Channels estimation for multiple input—multiple output, orthogonal frequency division multiplexing (OFDM) system |
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JP2006506024A (ja) | 2006-02-16 |
CN1643867A (zh) | 2005-07-20 |
CN1643867B (zh) | 2010-06-23 |
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