JP4851124B2 - 多重ーアンテナ通信システムにおける伝送方法、基地局及び多重ーアンテナ通信システムにおける装置 - Google Patents
多重ーアンテナ通信システムにおける伝送方法、基地局及び多重ーアンテナ通信システムにおける装置 Download PDFInfo
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Description
・複数のパイロット信号を生成する、
・該複数のパイロット信号を、伝搬チャネルを通して送信装置及び複数の受信装置の間で送信する、ここにおいて、該送信装置は、少なくとも一つの送信アンテナを具備し、該複数の受信装置のそれぞれは、少なくとも一つの受信アンテナを具備し、及び該伝搬チャネルは、該送信装置及び該複数の受信装置の間に複数のサブチャネルを具備する、
・該複数の受信装置のそれぞれで、該複数のパイロット信号のうちの少なくとも一つを受信する、
・該複数のサブチャネルのうちの少なくとも一つのための送信特性の組を決定する、ここにおいて、該送信特性の組を決定する該工程は、該複数の受信装置のそれぞれで受信した該複数のパイロット信号のうちの少なくとも一つを使用する、
該複数の受信装置のそれぞれから該送信装置へ情報信号を報告する、ここにおいて、情報信号は、該複数のサブチャネルのうちの少なくとも一つに関する該送信特性の組を伝える、及び、
・該情報信号に基づいて、送信装置で送信パラメータの組を最適化する。
・共通の要素をもたない複数の直交周波数分割多重化(OFDM)サブチャネルの組を生成する、ここにおいて、該共通の要素をもたない複数のOFDMサブチャネルの組は、共通の要素をもたない、実質的に直交周波数分割多重化サブチャネルの組を具備できる、及び、
・該共通の要素をもたない複数のOFDMサブチャネルの組の少なくとも一つで、該複数のパイロット信号の少なくとも一つを送信する。
・主要なリンクと関連する該共通の要素をもたない複数のOFDMサブチャネルの組のうちの少なくとも一つ、及び、干渉するリンクの組と関連する該共通の要素をもたない複数のOFDMサブチャネルの組のうちの少なくとも一つ。
・前記主要なリンクの送信特性の組を代表する多項式の関数を生成する;及び、
・前記多項式の関数と関連する係数の組を送信する。
・前記送信装置で複数のスケジューリングメッセージを生成する、及び、
・前記複数の受信装置のうちの少なくとも一つに、該複数のスケジューリングメッセージのうちの少なくとも一つを送信する、ここにおいて、該複数のスケジューリングメッセージのうちの前記少なくとも一つの受信で、前記複数の受信装置の前記少なくとも一つは、前記情報信号を報告する前記工程を予定する。
・複数のパイロット信号を生成するための手段、
・送信装置及び複数の受信装置間の伝搬チャネルを通して、該複数のパイロット信号を送信するための手段、ここにおいて、前記送信装置は、少なくとも一つの送信アンテナを具備する、前記複数の受信装置のそれぞれは、少なくとも一つの受信アンテナを具備する、及び前記伝搬チャネルは、前記送信装置及び前記複数の受信装置の間に複数のサブチャネルを具備する、
・前記受信装置において、前記複数のパイロット信号のうちの少なくとも一つを受信するための手段、
・前記複数のサブチャネルのうちの少なくとも一つのための送信特性の組を決定するための手段、ここにおいて、前記送信特性の組を決定する前記工程は、前記複数の受信装置のそれぞれで受信された前記複数のパイロット信号のうちの少なくとも一つを使用する、
・前記複数の受信装置のそれぞれから前記送信装置に情報信号を報告するための手段、ここにおいて、前記情報信号は、前記複数のサブチャネルのうちの少なくとも一つのための前記送信特性の組を伝える、及び、
・前記情報信号に基づいて、前記送信装置で送信パラメータの組を最適化するための手段。
・共通の要素をもたない複数のサブチャネルの組を複数の送信アンテナに割り当てる、
・複数の直交周波数分割多重化(OFDM)パイロット信号を送信装置から複数の受信装置へ送信する、ここにおいて、該複数OFDMパイロット信号の各々は、該共通の要素をもたない複数のサブチャネルの組のうちの少なくとも一つで送信される、
・前記複数のOFDMパイロット信号を復調する、
・前記共通の要素をもたない複数のサブチャネルの組の前記CSIを決定する、ここにおいて、前記CSIを決定する前記工程は、前記復調された複数のOFDMパイロット信号を使用する、
・前記共通の要素をもたない複数のサブチャネルの組の前記CSIを、前記送信装置に送信する、及び、
・送信シンボルをあらかじめ調整する。
・前記CSIを減じられた行列に圧縮する、及び、
・前記減じられた行列の代表を前記送信装置に送信する。
・通信リンクが所定のしきい値より少ない数のマルチパス構成要素を有するかどうかを決定する、及び、
・前記マルチパス構成要素の数が、前記所定のしきい値より少ない場合、前記通信リンクのチャネル周波数応答の組で逆高速フーリエ変換(IFFT)操作を実行する、ここにおいて、前記IFFT操作の前記結果は、前記送信装置に送信されるチャネル状態情報である。
・共通の要素をもたない複数のサブチャネルの組を複数の送信アンテナに割り当てるための、複数のパイロット信号を生成するための、該複数のパイロット信号のそれぞれを該共通の要素をもたない複数のサブチャネルの組のうちの少なくとも一つに割り当てるための、及び送信データをあらかじめ調整するための、基地局におけるプロセッサ、
・前記複数のパイロット信号を受信するための、及び前記複数のパイロット信号を前記複数の割り当てられた共通の要素をもたないサブチャネルの組に変調するためのプロセッサに接続された変調器、ここにおいて、前記複数の割り当てられた共通の要素をもたないサブチャネルの組は、前記複数の送信アンテナにより送信される、
・前記共通の要素をもたない複数のサブチャネルの組で伝えらたデータを受信するための、複数の受信装置のそれぞれにおける復調器、及び、
・復調されたデータを分析するための、前記複数の受信装置のそれぞれにおける前記復調器に接続されたプロセッサ、ここにおいて、前記プロセッサは、変調されたデータからのCSIを決定する及び前記基地局に送信するためのCSIメッセージを生成する、ここにおいて、前記CSIメッセージは、前記基地局において、送信データをあらかじめ調整するための前記プロセッサによって使われる。
関連する分散的なチャネル効果を有し、多重送信アンテナ及び多重受信アンテナを使用するシステムの複雑性、を考慮すると、好適な変調技術はOFDMであり、それは、チャネルを一組の非干渉狭帯域チャネルまたはサブチャネルに効果的に分解する。適当なOFDM信号デザインによって、ひとつのサブチャネル上で送信された信号は、「平坦で、弱まっている」ように見える、すなわち、チャネル応答は、サブチャネルバンド幅以上で実際上一定である。チャネル状態情報またはCSIは、それぞれのサブチャネルのための送受信アンテナの全ての組の間の伝搬経路(即ち、振幅及び位相)の十分な特性描写を含む。CSIも、C/I情報として公知である、それぞれのサブチャネルの干渉及びノイズの相対的なレベルの情報を含む。CSIは下記のように、送信アンテナから受信アンテナへの送信経路の状態を記述している複合の利得値の一組の行列に表現されることができる。CSIについては、送信装置は受信装置に送信する前にデータをあらかじめ調整する。
E=は、送信アンテナから受信アンテナまでの送信損失に関する固有ベクトル行列である;及び、x1、x2...xNTは、あらかじめ調整された変調シンボルであり、
図3は、図1Aのシステム110のデータプロセッサ112と変調器114のブロック図である。システム110により送信される全てのデータを含む集積され、入力されたデータストリームは、データプロセッサ112の範囲内のデマルチプレクサ(DEMUX)310に提供される。デマルチプレクサ310は、入力されたデータストリームを多くの(K)チャネルデータストリームS1からSkに、非多重化する。それぞれのチャネルデータストリームは、例えば信号チャネル、ブロードキャストチャネル、音声通話またはトラフィックデータの送信に対応できる。それぞれのチャネルデータストリームは、特定の符号化方式を使用しているデータをコード化するそれぞれのエンコーダ312に提供される。
Claims (17)
- 下記工程を具備する、多重−アンテナ通信システムにおける伝送方法:
複数のアンテナの各々を複数のサブバンドの組の内の異なる1つで割り当てる、ここにおいて、複数の組の各々は複数のサブバンドの異なるサブセットを有しており、第一の組の複数のサブバンドは隣接していない;及び
複数のサブバンドの組を使用して、同時に複数のアンテナから伝送する、ここにおいて、各アンテナからの伝送は該アンテナに割り当てられたサブバンドの組上で生起する、
第一のパイロットシンボルはシフトされた最大長シフトレジスターシーケンス(m−シーケンス)およびシフトされた、添付のm−シーケンスを具備する、ここにおいて、該シフトされた、添付のm−シーケンスは、該m−シーケンスの反復された部分を含む。 - 該複数の組の各々は、同じ数のサブバンドを有している、請求項1に記載の方法。
- 該複数の組の各々におけるサブバンドは、該複数のサブバンドを横切って均一に振り分けられる、請求項1に記載の方法。
- さらに、第一のパイロットシンボルを直交符号化することを具備する、請求項1に記載の方法。
- 第一のパイロットシンボルは、ウォルッシュコードシーケンスで直交符号化される、請求項4に記載の方法。
- 多重−アンテナ通信システムは直交周波数分割多重化(OFDM)を利用する、請求項1に記載の方法。
- 複数の伝送アンテナ;
複数の伝送アンテナに複数のパイロットシンボルを割り当てるために、複数の伝送アンテナにサブーチャネルのサブセットを割り当てるために、伝送データを予め調整するために、複数のシフトされた最大長シフトレジスタシーケンス(m−シーケンス)を有する複数のパイロットシンボルを符号化するための第一のプロセッサ、ここにおいて、割り当てられたサブーチャネルのサブセットの各々は隣接せず、そして複数のサブーチャネルの異なるサブセットを含む、サブーチャネルを備え、該複数のパイロットシンボルのそれぞれは、シフトされた、添付のm−シーケンスを具備する、ここにおいて、該シフトされた、添付のm−シーケンスは、該m−シーケンスの反復された部分を含む;及び
複数の変調器、各変調器は、割り当てられた各サブーチャネルのサブセット上で割り当てられた複数のパイロットシンボルを変調するために、第一のプロセッサに及び複数の伝送アンテナの少なくとも1つに連結される;
ここにおいて、複数の伝送アンテナは、各割り当てられたサブーチャネルのサブセット上で割り当てられた複数のパイロットシンボルの各々を伝送する、
を具備する基地局。 - 複数のパイロットシンボルが、複数の直交パイロットシンボルを具備する、請求項7に記載の基地局。
- 複数のパイロットシンボルは複数の周期的OFDMシンボルを含む、請求項7に記載の基地局。
- 該複数の組の各々は、同じ数のサブバンドを有する、請求項7に記載の基地局。
- 該複数の組の各々は、複数のサブバンドを横切って均一に振り分けられる、請求項7に記載の基地局。
- 複数のアンテナの各々を、複数のサブバンドの組の異なる1つで割り当てるための手段、ここにおいて、該複数の組は複数のサブバンドの異なるサブセットを含み、第一の組の複数のサブバンドは隣接していない、及び
複数のサブバンドの組を使用して、同時に複数のアンテナから伝送するための手段、ここにおいて、各アンテナからの伝送は、該アンテナに割り当てられたサブバンドの組で生起する、
シフトされた最大長シフトレジスタシーケンス(m−シーケンス)に従って第1のパイロットシンボルを符号化するための手段、
を備え、該第1のパイロットシンボルは、シフトされた、添付のm−シーケンスを具備する、ここにおいて、該シフトされた、添付のm−シーケンスは、該m−シーケンスの反復された部分を含む、多重−アンテナ通信システムにおける装置。 - 複数の組の各々は、同じ数のサブバンドを含んでいる、請求項12の装置。
- 該複数の組の各々におけるサブバンドは、複数のサブバンドを横切って均一に振り分けられる、請求項12に記載の装置。
- さらに、第一のパイロットシンボルを直交符号化するための手段をさらに具備する、請求項12に記載の装置。
- さらに、ウォルッシュ符号シーケンスで第一のパイロットシンボルを直交符号化するための手段を具備する、請求項15に記載の装置。
- 多重−アンテナ通信システムは、直交周波数分割多重化(OFDM)を利用する、請求項12に記載の装置。
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