JP2013240102A - ソフトパイロットシンボルを用いる無線信号を処理するための受信機および方法 - Google Patents
ソフトパイロットシンボルを用いる無線信号を処理するための受信機および方法 Download PDFInfo
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- H04B1/69—Spread spectrum techniques
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- 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
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- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/345—Modifications of the signal space to allow the transmission of additional information
- H04L27/3455—Modifications of the signal space to allow the transmission of additional information in order to facilitate carrier recovery at the receiver end, e.g. by transmitting a pilot or by using additional signal points to allow the detection of rotations
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- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/38—Demodulator circuits; Receiver circuits
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- H04B2201/707—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
- H04B2201/70701—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation featuring pilot assisted reception
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Abstract
【解決手段】16QAM、64QAM等のより高次の変調法で上記系列内の残りのシンボルを変調する一方で、BPSKまたはQPSK等のより低次の変調法でソフトパイロットシンボルを変調することにより、ソフトパイロットシンボルのセットは、系列内の残りのシンボルよりもより高い信頼性で送信される。ソフトパイロットシンボルの変調方式および位置(時間/周波数/符号)は受信機にとって既知であり、受信機はソフトパイロットシンボルをまず復調し、既知のシンボルとして使用して、受信無線信号のパラメータを推定する。ソフトパイロットはさらにデータを搬送する。加えて、ソフトパイロットは、より高次の変調シンボルの復調に不可欠である振幅リファレンスを確立するのに特に有用である。
【選択図】図1
Description
この出願は、2008年6月17日に提出された米国の仮出願第61/073,264号の利益を主張し、当該仮出願の開示は、全体として参照によりここに取り入れられる。
ソフトパイロットの導入は、送信信号が搬送することができるチャネル符号化されたビットの数を減少させる。チャネル符号化されたビットの減少は、以下に説明される2つの異なるアプローチにより実装されることが可能である。
図8は、本発明の例示的な実施形態におけるE−DCHについてのソフトパイロット生成プロセスを説明するフロー図である。HS−DSCHと同様の信頼性の識別を達成するために、物理レイヤHARQ機能性およびチャネルインターリービングにおけるビット収集手続きは、もしあれば系統的なターボ符号化されたビットをできる限り4PAMの第1のビットラベルにマッピングするように設計される。好ましい実施形態によると、ソフトパイロットシンボルは、E−DCHチャネルインターリービングの後に生成される。
ソフトパイロットシンボルは、同一の符号上、単一の別々の符号上、MIMO(Multiple-Input-Multiple-Output)システムにおける別々のアンテナ上、等に組み込まれ得る。ソフトパイロットシンボルが別々の符号および/またはアンテナ上で同時に発生し、または同時に発生しないように、配置が調整され得る。
Claims (2)
- 送信されるシンボルの系列を含む受信無線信号を処理するためのG−Rake(generalized Rake)受信機における方法であって:
第1のパスにおける近似の合成重みのセットを算出するステップと;
前記系列内の残りのシンボルよりもより低次の変調法で変調される前記系列内のソフトパイロットシンボルのセットを識別するステップと;
前記近似の合成重みを利用して、前記ソフトパイロットシンボルに対応する逆拡散値をコヒーレントに合成し、シンボル推定値を生成するステップと;
送信について使用されるコンスタレーションを前提として、デコーダの関与なしに前記シンボル推定値についてのシンボルの硬判定を行うステップと;
前記シンボルの硬判定を復調パイロットとして利用し、障害共分散行列をノンパラメトリックに推定するステップと;
推定された前記障害共分散行列を利用して、第2のパスにおける精緻化された合成重みのセットを算出するステップと;
前記精緻化された合成重みを利用して、全てのトラフィックデータを合成するステップと;
を含む方法。 - 送信されるシンボルの系列を含む受信無線信号を処理するための2パスのG−Rake(generalized Rake)受信機であって:
第1のパスにおける近似の合成重みのセットを算出するための手段と;
前記系列内の残りのシンボルよりもより低次の変調法で変調される前記系列内のソフトパイロットシンボルのセットを識別するための手段と;
前記近似の合成重みを利用して、前記ソフトパイロットシンボルに対応する逆拡散値をコヒーレントに合成し、シンボル推定値を生成するための手段と;
送信について使用されるコンスタレーションを前提として、デコーダの関与なしに前記シンボル推定値についてのシンボルの硬判定を行うための手段と;
前記シンボルの硬判定を復調パイロットとして利用し、障害共分散行列をノンパラメトリックに推定するための手段と;
推定された前記障害共分散行列を利用して、第2のパスにおける精緻化された合成重みのセットを算出するための手段と;
前記精緻化された合成重みを利用して、全てのトラフィックデータを合成するための手段と;
を備えるG−Rake受信機。
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US7326408P | 2008-06-17 | 2008-06-17 | |
US61/073,264 | 2008-06-17 | ||
US12/239,918 US8149929B2 (en) | 2008-06-17 | 2008-09-29 | Receiver and method for processing radio signals using soft pilot symbols |
US12/239,918 | 2008-09-29 |
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JP2011514142A Pending JP2011526435A (ja) | 2008-06-17 | 2009-06-15 | ソフトパイロットシンボルを用いる無線信号を処理するための受信機および方法 |
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US9264097B2 (en) * | 2009-06-04 | 2016-02-16 | Qualcomm Incorporated | Interference mitigation for downlink in a wireless communication system |
US8699553B2 (en) * | 2010-02-19 | 2014-04-15 | Telefonaktiebolaget Lm Ericsson (Publ) | Data-aided SIR estimation |
US8897339B2 (en) | 2010-04-20 | 2014-11-25 | Telefonaktiebolaget L M Ericsson (Publ) | Method and arrangement of increasing impairment co-variance matrix estimation accuracy |
US8582624B2 (en) | 2010-10-01 | 2013-11-12 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and apparatus for enhancing the accuracy of the estimated covariance matrix in wideband-CDMA systems |
US8737247B1 (en) * | 2010-10-08 | 2014-05-27 | Marvell International Ltd. | Data channel noise estimation using pilot channel |
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