JP6195944B2 - 無線通信システムにおけるアンテナダイバーシティを与える方法および装置 - Google Patents
無線通信システムにおけるアンテナダイバーシティを与える方法および装置 Download PDFInfo
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- 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
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- H04L5/00—Arrangements affording multiple use of the transmission path
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- H—ELECTRICITY
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- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0667—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal
- H04B7/0671—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal using different delays between antennas
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
- H04B7/0691—Hybrid systems, i.e. switching and simultaneous transmission using subgroups of transmit antennas
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0697—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using spatial multiplexing
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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
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/20—Arrangements for detecting or preventing errors in the information received using signal quality detector
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/38—TPC being performed in particular situations
- H04W52/42—TPC being performed in particular situations in systems with time, space, frequency or polarisation diversity
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0602—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using antenna switching
- H04B7/0608—Antenna selection according to transmission parameters
- H04B7/061—Antenna selection according to transmission parameters using feedback from receiving side
-
- 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
- H04L27/2602—Signal structure
- H04L27/26035—Maintenance of orthogonality, e.g. for signals exchanged between cells or users, or by using covering codes or sequences
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Description
for Antenna Diversity in Multi−input Multi−Output Communication Systems」という名称の米国仮出願第60/710,408号、および2005年8月24日出願の「Method
and Apparatus for Antenna Diversity in Multi−input Multi−Output Communication Systems」という名称の米国仮出願第60/711,144号に対して優先権を主張し、いずれの仮出願も、本発明の譲受人に譲渡され、参照によって本明細書に取り入れられている。本出願はさらに、本出願と同日に出願され、参照によって本明細書に取り入れられている「Adaptive Sectorization in Cellular
Systems」という名称の、一緒に譲渡された番号未決定の米国特許出願に関連している。
空間多重化次数は、1つのシンボル周期において1つのサブキャリアで同時に送信するシンボルの数を決定し、空間ダイバーシティ次数は、送信されるシンボルによって観察される空間ダイバーシティの量を決定し、チャネル推定オーバヘッド次数は、パイロットのオーバヘッドの量を決定する。
なお、i=1,...,Tの場合、hi(k)は、サブキャリアkに対する送信アンテナiと単一の受信アンテナとの間の結合または複素チャネル利得を示す。
・空間ダイバーシティ次数(D)−送信される出力シンボルによって観察される空間ダイバーシティの量
・チャネル推定オーバヘッド次数(C)−各受信アンテナに対して受信機によって推定される仮想アンテナの数全体的に、M≦min{T,R}、D≦T、およびC≦Tである。空間ダイバーシティは、複数の送信アンテナの使用から生じる送信ダイバーシティを指し、複数の受信アンテナの使用から生じる受信ダイバーシティを含まない。
T個より少ない送信アンテナを送信に用いることは、通常、利用可能な全送信電力より少ない電力を送信に使用することになり、これは性能に影響を及ぼすことになる。
なお、s(k)は、1つのシンボル周期においてサブキャリアkで送信されるM個の出力シンボルを含むM×1ベクトルであり、
P(k)は、サブキャリアkに対するV×M置換行列であり、
U=〔u 1 u 2...u V〕は、T×V正規直交行列であり、
x(k)は、1つのシンボル周期においてサブキャリアkでT個の送信アンテナから送信されるT個の送信シンボルを含むT×1ベクトルである。
実施形態において、Uは、各行のV個のエントリの平方の大きさの和が一定値に等しいように定義される。この特性により、等しい送信電力がT個の送信アンテナのすべてに使用されることになる。Uは、特性U H・U=U・U H=Iによって特徴付けられるユニタリ行列であってもよい。正規直交行列およびユニタリ行列は、以下に述べるように形成されうる。UのV列を使用して、V個の仮想アンテナを形成し、V個の仮想アンテナは、1つのシンボル周期において1つのサブキャリアでV個以下の出力シンボルを送信するのに使用されうる。仮想アンテナは、有効アンテナとも、または何か別の用語によって呼ばれてもよい。
一般に、1つまたは複数の正規直交行列を使用して、データおよびパイロットが送信され、その結果、受信機は、パイロットに基づいてチャネル応答を推定し、チャネル応答推定値を使用して、受信機に送信されたデータを復元することができる。
=H(k)・U・P(k)・s(k)+n(k)
=H eff(k)・P(k)・s(k)+n(k)
=H used(k)・s(k)+n(k) 式(4)
なお、r(k)は、1つのシンボル周期においてサブキャリアkでR個の受信アンテナからのR個の受信されたシンボルを含むR×1ベクトルであり、
H eff(k)は、サブキャリアkに対するR×V有効チャネル応答行列であり、
H used(k)は、サブキャリアkに対するR×M使用チャネル応答行列であり、 n(k)は、サブキャリアkに対するR×1雑音ベクトルである。
=〔H(k)・u 1 H(k)・u 2...H(k)・u V〕 式(5)
H used(k)=H eff(k)・P(k)
=〔H(k)・u (1) H(k)・u (2)...H(k)・u (M)〕
式(6)
なお、{u (1) u (2)...u (M)}⊂{u 1 u 2...u V}である。
巡回遅延ダイバーシティは、時間領域または周波数領域のいずれで実現されうる。
X個のサンプルの巡回遅延は、K個の時間領域のサンプルのシーケンスにおける最後のX個のサンプルをシーケンスの前方に移動することによって実現されることができる。T個の送信アンテナに対する時間領域のサンプルは、異なる量を巡回的に遅延される。サイクリックプレフィックスは、K個の総サブキャリア間の直交性を確保するために、巡回遅延を適用した後に追加されうる。
2×2ウォルシュ行列W 2×2およびより大きなサイズのウォルシュ行列W 2N×2Nは、以下のように表現されることができる。
なお、Fは、T×Tフーリエ行列の最初のV行を含むT×V行列であり、
Λは、FのT行に対するTのスケーリング値を含むT×T対角行列である。
たとえば、送信機は、第1のサブキャリアセットにおいて第1の受信機にMIMO送信を送信し、第2のサブキャリアセットにおいて第2の受信機にSIMO送信を送信し、第3のサブキャリアセットにおいて第3の受信機にSISO送信を送信し、などであってもよい。
選択される仮想アンテナは、最後の仮想アンテナに達すると、仮想アンテナ1に折り返す。したがって、仮想アンテナ((k−1)mod V)+1ないし((k+M−2)mod V)+1が、割り当てられたサブキャリアkに使用され、なお、「mod S」は、モジュロS演算を表し、「−1」および「+1」は、割り当てられたサブキャリアのインデックスおよび仮想アンテナのインデックスが0ではなく、1から始まるためである。割り当てられた各サブキャリアkに対する置換行列P(k)のM列は、V×V恒等(identity)行列の((k−1,k,k+1,...,k+M−2)mod V)+1列である。たとえば、M=2およびV=3の場合には、置換行列は、以下のように定義されうる。
・仮想アンテナの数を容易に選択する柔軟性、
・任意の数の出力シンボルを利用可能な仮想アンテナ数以下で送信する柔軟性、および、
・送信される出力シンボルの数および利用可能な仮想アンテナの数に関係なく、T個の送信アンテナのすべてを送信に利用すること、を有する。
インターレースuは、第1のサブキャリアとしてサブキャリアuを含み、u∈{1,...,S}である。
ブロックホッピング方式の場合には、空間多重化次数は、仮想アンテナの数に等しく設定されてもよく、同期セクタを有するシステムの任意のセクタにおいて、任意の所与の時間−周波数ブロックに対して、一定の干渉が観察され得る。他のホッピング方式も、定義されうる。
Claims (20)
- データベクトルを受信し、
受信機からフィードバックを受信し、
前記フィードバックに基づいて、アンテナポートを表す複数の仮想アンテナを選択し、
選択された前記複数の仮想アンテナを示す置換行列を形成し、
出力シンボルを作り出すために前記データベクトルに前記置換行列を適用し、
前記アンテナポートに前記出力シンボルを提供する
ように構成された少なくとも1つのプロセッサと、
前記少なくとも1つのプロセッサに結合されたメモリと、を備える装置。 - 前記少なくとも1つのプロセッサは、前記複数の仮想アンテナを形成するために正規直交行列を使用するようにさらに構成される、請求項1に記載の装置。
- 前記少なくとも1つのプロセッサは、前記複数の仮想アンテナを形成するために、利用可能な複数の正規直交行列の中から前記正規直交行列を選択するようにさらに構成される、請求項2に記載の装置。
- 前記少なくとも1つのプロセッサは、前記複数の仮想アンテナを形成するために、利用可能な前記複数の正規直交行列の中から前記正規直交行列を、前記フィードバックに基づいて選択するようにさらに構成される、請求項3に記載の装置。
- 前記少なくとも1つのプロセッサが統合される基地局または端末のうちの少なくとも1つをさらに備える、請求項1に記載の装置。
- 前記複数の仮想アンテナに多数のV個の仮想送信アンテナがあり、複数の送信アンテナに多数のT個の送信アンテナがあり、前記少なくとも1つのプロセッサは、前記多数のV個の仮想送信アンテナを形成するために正規直交T×V行列を使用するようにさらに構成され、前記少なくとも1つのプロセッサは、前記正規直交T×V行列の各行のV個のエントリの平方の大きさの和が一定値に等しいように前記正規直交T×V行列を定義するようにさらに構成される、請求項1に記載の装置。
- 前記フィードバックは、すべての割り当てられたサブキャリアに使用するための前記複数の仮想アンテナにおける特定の仮想アンテナを指示する、請求項1に記載の装置。
- 前記フィードバックは、割り当てられた各サブキャリアに使用するための前記複数の仮想アンテナにおける特定の仮想アンテナを指示する、請求項1に記載の装置。
- 前記少なくとも1つのプロセッサは、
受信されたパイロットに基づいてアップリンクチャネル応答を推定し、
前記アップリンクチャネル応答推定に基づいてダウンリンクチャネル応答を推定し、
前記複数の仮想アンテナを選択するために前記ダウンリンクチャネル応答推定を使用するようにさらに構成される、請求項1に記載の装置。 - データベクトルを受信することと、
受信機からフィードバックを受信することと、
前記フィードバックに基づいて、アンテナポートを表す複数の仮想アンテナを選択することと、
選択された前記複数の仮想アンテナを示す置換行列を形成することと、
出力シンボルを作り出すために前記データベクトルに前記置換行列を適用することと、
前記アンテナポートに前記出力シンボルを提供することと、
を備える方法。 - 前記複数の仮想アンテナを形成するために、正規直交行列を使用することをさらに備える、請求項10に記載の方法。
- 前記複数の仮想アンテナを形成するために、利用可能な複数の正規直交行列の中から前記正規直交行列を選択することをさらに備える、請求項11に記載の方法。
- 前記複数の仮想アンテナを形成するために、利用可能な前記複数の正規直交行列の中から前記正規直交行列を、前記フィードバックに基づいて選択することをさらに備える、請求項12に記載の方法。
- データベクトルを受信するための手段と、
受信機からフィードバックを受信するための手段と、
前記フィードバックに基づいて、アンテナポートを表す複数の仮想アンテナを選択するための手段と、
選択された前記複数の仮想アンテナを示す置換行列を形成するための手段と、
出力シンボルを作り出すために前記データベクトルに前記置換行列を適用するための手段と、
前記アンテナポートに前記出力シンボルを提供するための手段とを備える装置。 - 前記複数の仮想アンテナを形成するために、正規直交行列を使用するための手段をさらに備える、請求項14に記載の装置。
- 前記複数の仮想アンテナを形成するために、利用可能な複数の正規直交行列の中から前記正規直交行列を選択するための手段をさらに備える、請求項15に記載の装置。
- 前記複数の仮想アンテナを形成するために、利用可能な前記複数の正規直交行列の中から前記正規直交行列を、前記フィードバックに基づいて選択するための手段をさらに備える、請求項16に記載の装置。
- 前記データベクトルを受信するための前記手段が統合される基地局または端末のうちの少なくとも1つをさらに備える、請求項14に記載の装置。
- コンピュータに対して、請求項10乃至13のうちのいずれか1つに記載の方法を実行させる、コンピュータプログラム。
- プログラムを記録したコンピュータ可読記録媒体であって、前記プログラムは、コンピュータに対して、請求項10乃至13のうちのいずれか1つに記載の方法を実行させる、コンピュータ可読記録媒体。
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US71040805P | 2005-08-22 | 2005-08-22 | |
US60/710,408 | 2005-08-22 | ||
US71114405P | 2005-08-24 | 2005-08-24 | |
US60/711,144 | 2005-08-24 | ||
US11/261,823 US20070041457A1 (en) | 2005-08-22 | 2005-10-27 | Method and apparatus for providing antenna diversity in a wireless communication system |
US11/261,823 | 2005-10-27 |
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JP2014212940A Division JP2015053704A (ja) | 2005-08-22 | 2014-10-17 | 無線通信システムにおけるアンテナダイバーシティを与える方法および装置 |
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JP2016129337A JP2016129337A (ja) | 2016-07-14 |
JP6195944B2 true JP6195944B2 (ja) | 2017-09-13 |
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