JP5065425B2 - 多重伝送モードを有する多重入力、多重出力(mimo)システム - Google Patents
多重伝送モードを有する多重入力、多重出力(mimo)システム Download PDFInfo
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- H04B7/0842—Weighted combining
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Description
この明細書に記載されているデータ送信技術は、種々の多重チャンネル通信システムに対して使用されることができる。このような多重チャンネル通信システムには、多重入力多重出力(MIMO)通信システム、直交周波数分割多重化(OFDM)通信システム、OFDMを使用するMIMOシステム(すなわち、MIMO−OFDMシステム)およびその他が含まれる。多重チャンネル通信システムはまた符号分割多元アクセス(CDMA)、時分割多元アクセス(TDMA)、周波数分割多元アクセス(FDMA)、または別のある多元アクセス技術を実施する。簡明にするために、とくに多重アンテナ無線通信システムのようなMIMOシステムに関して、本発明のある特徴および実施形態を説明する。
Hは、MIMOチャンネルに対するチャンネル応答特性マトリックスである;
nは0の平均ベクトルおよびΛ n=σ2 Iの共分散マトリックスを有する加法的ホワイトガウス雑音(AWGN)であり、ここで、0はゼロのベクトルであり、Iは対角線に沿った1と他の全ての箇所における0を有する恒等行列であり、σ2は雑音の分散である;
[・]Tは[・]の転置を示す。
H=UDV H 式(3)
ここで、
UはNR×NRユニタリマトリックスである(すなわち、U H U=I);
DはNR×NTマトリックスである;
VはNT×NTユニタリマトリックスである;
“H”はあるマトリックスの複素数転置を示す。
x=Vs 式(4)
その後、このベクトルxはMIMOチャンネルによって受信機に送信される。
Ptot=NT・Pmax 式(6)
全送信パワーは、種々の方式に基づいてデータ流に割当てられることができる。
C=log2(1+γ) 式(7)
γi=(Pi・λi)/σ2 式(9)
ここで、全てのサブチャンネルに対して同じ雑音分散を仮定すると、λiはサブチャンネルi上のチャンネル利得であり、σ2はMIMOチャンネルに対する雑音分散である。したがって、NS個の空間サブチャンネルに対してウォーターフィリング送信方式によって達成される容量は、以下のように表されることができる:
ρi=log2(1+γi) 式(11)
システムの合計スペクトル効率は、式(11)に示されているようにそれぞれ決定されることのできる全ての固有モードのスペクトル効率の和である。
γop=1/σ2 式(16)
全CSI(たとえば、チャンネル応答特性マトリックス)の代りに量を減少されたCSI(たとえば、事後処理SNRおよび特異ベクトル)に依存する送信方式を使用することにより、受信機から送信機に報告されることが必要なチャンネル情報の量が大幅に減少されることができる。全CSIに依存する送信方式では、NR・NF個の複素数チャンネル利得プラス雑音分散、あるいは等価な情報が送信機に報告される必要がある。反対に、部分的CSI送信方式はNS個のSNR値があればよく、ここでNS≦min{NT,NR}である。各SNR値はマップされ、MIMOシステムによりサポートされている特定の“レート”で表されてもよい。このレートは、対応した送信アンテナでのデータ流に使用されるべき特定のデータレートならびに符号化および変調方式を示している。
ビットの数(Q) 2 3 4 5
SNRの劣化(dB) 6.12 2.7 1.25 0.6
表2に示されているように、低い4ビット/ディメンション(すなわち、Q=4)、あるいは8ビット/複素数チャンネル利得が特異ベクトルを符号化するために使用されてもよい。5ビット/ディメンション(すなわち、Q=5)、あるいは10ビット/複素数チャンネル利得値はさらに良好な性能を提供する。各複素数チャンネル利得を適切に表すために必要とされるビットの数はまた、MIMOシステムのディメンションの関数であってもよい。たとえば、3×3または2×2MIMOシステムは、複素数チャンネル利得の(実数または虚数)ディメンション当り4または5より少ないビットを必要とする。
図3は、この明細書に記載されている種々の特徴および実施形態を実施することのできる送信システム310および受信システム350の1実施形態のブロック図である。
Claims (28)
- 直交周波数分割多重(OFDM)無線通信システムにおいて複数の周波数サブチャンネルによりデータを送信する方法であって、
前記通信システムの動作状態を決定することと、
前記決定された動作状態に基づいて、複数の可能なパワー割当て送信方式の中から選択された特定のパワー割当て送信方式を識別することと、
選択された送信方式に基づいて、1以上の前記周波数サブチャネルにより送信されるべき1以上のデータ流を決定することと、および
前記選択された送信方式に基づいて、前記1以上のデータ流を処理することとを
具備する方法であって、前記動作状態は、信号対雑音情報(SNR)によって定量化さ
れ、前記複数の送信方式は、部分的チャネル状態情報(CSI)送信方式およびビーム形成送信方式を含んでおり、前記動作中のSNRがしきい値SNRより上である場合には前記部分的CSI送信方式が選択されて使用され、前記動作中のSNRが前記しきい値SNRより下である場合には前記ビーム形成送信方式が選択されて使用される、方法。 - 前記特定の送信方式は、前記複数の可能な送信方式のそれぞれの性能を評価することにより選択される、請求項1に記載の方法。
- 前記選択された送信方式は、動作中の信号対雑音(SNR)に基づいて選択される、請求項1に記載の方法。
- 前記1以上のデータ流は、チャンネル状態情報に基づいてさらに処理される、請求項1に記載の方法。
- 前記部分的CSI送信方式についての前記チャンネル状態情報は、信号対雑音比を具備する、請求項4に記載の方法。
- 単一の周波数サブチャンネルが選択されて前記ビーム形成送信方式に使用され、および前記単一の選択された周波数サブチャンネル上でのデータ送信のためにビーム形成が使用される、請求項4に記載の方法。
- 前記ビーム形成送信方式についての前記チャンネル状態情報は、信号対雑音比(SNR)と、単一の選択された周波数サブチャンネルについての特異ベクトルとを具備する、請求項4に記載の方法。
- 前記特異ベクトルの各要素は、ディメンション当り5以下のビットに量子化される、請求項7に記載の方法。
- 前記複数の送信方式は、ビーム操縦送信方式を含む、請求項4に記載の方法。
- 前記ビーム操縦送信方式についての前記チャンネル状態情報は、信号対雑音比(SNR)と、データ送信に使用される複数の送信アンテナについての位相値のベクトルとを具備する、請求項9に記載の方法。
- 前記位相値のベクトルは、主要固有モードについての特異ベクトルに基づいている、請求項10に記載の方法。
- 各データ流についてのレートを、そのデータ流に関して達成可能な信号対雑音比(SNR)に基づいて、選択することをさらに具備する、請求項1に記載の方法。
- すべての周波数帯域の使用のために1つの送信方式が選択され、および1つ以上のデータ流が、各周波数帯域上で送信されて、前記選択された送信方式に基づいて処理される、請求項1に記載の方法。
- 各周波数帯域の使用のために1つの送信方式が選択され、および1つ以上のデータ流が、各周波数帯域上で送信されて、その周波数帯域について選択された前記送信方式に基づいて処理される、請求項1に記載の方法。
- 前記複数の周波数帯域のそれぞれについて使用されるためにビーム形成送信方式が選択される、請求項1に記載の方法。
- 全送信パワーは、前記複数の周波数帯域上で送信される全てのデータ流について、共通の符号化および変調方式が使用されるように割り当てられる、請求項15に記載の方法。
- 前記複数の周波数帯域のそれぞれについて使用されるために部分的CSI送信方式が選択される、請求項1に記載の方法。
- 全送信パワーは、各周波数帯域上で送信される全てのデータ流について、共通の符号化および変調方式が使用されるように割り当てられる、請求項17に記載の方法。
- 全送信パワーは、各空間サブチャンネル上で送信される全てのデータ流について、共通の符号化および変調方式が使用されるように割り当てられる、請求項17に記載の方法。
- 直交周波数分割多重(OFDM)無線通信システムにおいて複数の周波数サブチャンネル上でデータを送信する方法であって、
前記OFDMシステムの動作中の信号対雑音比(SNR)を決定することと、
前記動作中のSNRに基づいて、複数の可能なパワー割当て送信方式の中から選択された特定のパワー割当て送信方式を識別することと、ここにおいて、前記複数の送信方式は、動作中のSNRのそれぞれの範囲のための使用のために指定される、
前記選択された送信方式に基づいて、1以上の前記周波数サブチャネルにより送信されるべき1以上のデータ流を決定することと、および
前記選択された送信方式に基づいて、前記1以上のデータ流を処理することとを
具備する方法であって、
前記複数の送信方式は、部分的CSI送信方式およびビーム形成送信方式を含んでおり、前記動作中のSNRがしきい値SNRより上である場合には前記部分的CSI送信方式が選択されて使用され、前記動作中のSNRが前記しきい値SNRより下である場合には前記ビーム形成送信方式が選択されて使用される、方法。 - 無線の直交周波数分割多重(OFDM)通信システムにおける装置であって、
前記OFDM通信システムの動作状態を決定するための手段であって、前記OFDM通信システムは、複数の周波数サブチャネルを具備する、手段と、
前記決定された動作状態に基づいて、複数の可能なパワー割当て送信方式の中から選択された特定のパワー割当て送信方式を識別するための手段と、
前記選択された送信方式に基づいて、1以上の前記周波数サブチャネル上で送信されるべき1以上のデータ流を決定するための手段と、および
前記選択された送信方式に基づいて、前記1以上のデータ流を処理するための手段と
を具備する装置であって、
前記特定の送信方式は、前記通信システムの動作中のSNRに基づいて選択され、および前記複数の送信方式は、動作中のSNRのそれぞれの範囲のための使用のために指定され、
前記複数の送信方式は、部分的CSI送信方式およびビーム形成送信方式を含んでおり、前記動作中のSNRがしきい値SNRより上である場合には前記部分的CSI送信方式が選択されて使用され、前記動作中のSNRが前記しきい値SNRより下である場合には前記ビーム形成送信方式が選択されて使用される、装置。 - 各データ流についてのレートを、そのデータ流によって達成可能な信号対雑音比(SNR)に基づいて選択するための手段をさらに具備する、請求項21に記載の装置。
- 無線の直交周波数分割多重(OFDM)通信システムにおける送信装置であって、前記OFDMシステムは、複数の周波数サブチャンネルを具備し、前記装置は、
前記OFDM通信システムの動作状態の表示を受信することと、
前記動作状態に基づいて、複数の可能なパワー割当て送信方式の中から選択された特定のパワー割当て送信方式を識別することと、
前記選択された送信方式に基づいて1以上の前記周波数サブチャンネルにより送信されるべき1以上のデータ流を決定することと、
各データ流についてのレートを、そのデータ流に割り当てられた送信パワーの量に部分的に基づいて、選択することと、および、
前記選択された送信方式に基づいて前記1以上のデータ流の処理を指令することと
によって、前記複数の周波数サブチャンネルによるデータ送信を指令するように動作する制御装置と、
各データ流を、前記選択されたレートに基づいて処理して各シンボル流を提供するように動作する送信(TX)データプロセッサと、および
1以上のシンボル流を処理して周波数サブチャンネルよる送信に適した1以上の変調された信号を提供するように動作する1以上の送信機と
を具備し、
ここで、前記複数の送信方式は、部分的CSI送信方式およびビーム形成送信方式を含んでおり、前記制御装置は、通信システムの動作中の信号対雑音および干渉比(SNR)がしきい値SNRより上である場合には前記部分的CSI送信方式を選択するように動作し、前記動作中のSNRが前記しきい値SNRより下である場合には前記ビーム形成送信方式を選択するように動作する、装置。 - 前記制御装置は、前記部分的CSI送信方式の場合、各データ流のためにピーク送信パワーを使用し、および前記ビーム形成送信方式の場合、単一のデータ流のために全送信パワーを割り当てるようにさらに動作する、請求項23に記載の送信装置。
- 請求項23に記載の送信装置を具備する基地局。
- 無線の直交周波数分割多重(OFDM)通信システムにおける受信装置であって、
特定の受信機処理方式にしたがって受信された複数のシンボル流を受信して処理し、少なくとも1つの再生されたシンボル流を提供するとともに、再生されたシンボル流のそれぞれについてのチャンネル状態情報(CSI)を導出するように動作する受信(RX)MIMOプロセッサと、
少なくとも1つの再生されたシンボル流を、少なくとも1つの復調および復号方式にしたがって処理して、復号されたデータを提供するように動作するRXデータプロセッサと、
前記CSIを処理して送信されたものを送信装置に返送するように動作するTXデータプロセッサと
を具備する受信装置であって、
特定のパワー割当て送信方式が、前記CSIに基づいて複数の可能なパワー割当て送信方式の中から選択され、前記選択されたパワー割当て送信方式に基づいて1以上のデータ流が前記受信装置に送信され、前記選択されたパワー割当て送信方式に基づいて利用可能な全送信パワーが前記1以上のデータ流に割り当てられ、前記複数の送信方式は、部分的CSI送信方式およびビーム形成送信方式を含んでおり、動作中の信号対雑音および干渉比(SNR)がしきい値SNRより上である場合には前記部分的CSI送信方式が選択され、前記動作中のSNRが前記しきい値SNRより下である場合には前記ビーム形成送信方式が選択される、受信装置。 - 前記ビーム形成送信方式の場合、前記RX MIMOプロセッサは、前記複数の受信されたシンボル流を特異ベクトルにより予備調整し、単一の再生されたシンボル流を提供するようにさらに動作する、請求項26記載の受信装置。
- 前記部分的CSI送信方式の場合、前記RX MIMOプロセッサは、前記複数の受信されたシンボル流を、連続消去をともなう最小2乗平均エラー(MMSE−SC)受信機処理技術に基づいて処理し、複数の再生されたシンボル流を提供するようにさらに動作する、請求項26に記載の受信装置。
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