JP4435737B2 - 送信重みを決定する方法 - Google Patents
送信重みを決定する方法 Download PDFInfo
- Publication number
- JP4435737B2 JP4435737B2 JP2005512359A JP2005512359A JP4435737B2 JP 4435737 B2 JP4435737 B2 JP 4435737B2 JP 2005512359 A JP2005512359 A JP 2005512359A JP 2005512359 A JP2005512359 A JP 2005512359A JP 4435737 B2 JP4435737 B2 JP 4435737B2
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- JP
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- Prior art keywords
- transmission
- weights
- weight
- pilot
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- Prior art date
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Classifications
-
- 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
- H04B7/0615—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 weighted versions of same signal
- H04B7/0619—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 weighted versions of same signal using feedback from receiving side
- H04B7/0621—Feedback content
- H04B7/0632—Channel quality parameters, e.g. channel quality indicator [CQI]
-
- 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
- H04B7/0615—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 weighted versions of same signal
- H04B7/0617—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 weighted versions of same signal for beam forming
-
- 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
- H04L1/0001—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
-
- 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
- H04L27/261—Details of reference signals
-
- 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
- H04L27/2626—Arrangements specific to the transmitter only
Description
ゲラク・ポールラジェ(Gerlach Paulraj)著、「フィードバックのあるアダプティブ送信アンテナアレイ(Adaptive Transmitting Antenna Arrays with Feedback)」、IEEE信号処理レター(IEEE Signal Processing Letters)、1994年10月、第1巻第10号、p.150−152 バニスタ・ザイドラー(Banister Zeidler)著、「フィードバックのある送信アンテナの重み適合のための簡便な勾配記号のアルゴリズム(A simple Gradient Sign Algorithm for Transmit Antenna Weight Adaptation with Feedback)」、信号処理についてのIEEEトランザクション (IEEE Transactions on Signal Processing)、2003年5月、第51巻第5号、p.1156−1171 バニスタ・ザイドラー(Banister Zeidler)著、「MIMOシステムのためのフィードバック・アシスト・送信サブ空間の追跡(Feedback Assisted Transmission Subspace Tracking for MIMO Systems)」、通信の選択分野におけるIEEEジャーナル(IEEE Journal on Selected Areas in Communications)、2003年4月、第21巻第3号、p.452−463
f(W,Q,w)
のように定義される。
wbest=argmaxw(f(W,q,w))
として見出される。
wnew=g(wbest)
として得ることができる。
Claims (7)
- マルチキャリアシステム(10)で、1つ以上のデータストリームをM個のアンテナ(13)のセットにより複数の移動体端末(12)に送信する送信器(11)における方法であって、
夫々が所定の時間と周波数資源と各アンテナの複素送信重みとに関係する複数のシンボルの規則正しいセットを有する数多くのパイロットシーケンスを送信する工程と、
前記パイロットシーケンスに関係した前記送信重みを適合させ、前記複数の移動体端末(12)が少なくとも1つのダウンリンクチャネル特性の測定から導出した品質指標のセットの目的関数の最適化を達成する工程と、
前記適合された送信重みで前記パイロットシーケンスを送信する工程と、
前記適合された送信重み1つ以上を用いて1つ以上の情報ストリームを送信する工程とを有し、
前記送信重みを適合させる工程では、
前記目的関数を最良の重みのセットを決定するための関数として用い、
前記最良の重みのセットを現在の送信重みと品質指標のセットとに基づいて決定し、前記最良の重みのセットに基づいて前記適合された送信重みのセットを取得することを特徴とする方法。 - 前記送信重みは、1つ以上の選択されたグループのユーザに共通の情報のマルチキャスト送信に適用可能であるよう適合されることを特徴とする請求項1に記載の方法。
- 前記送信重みのセットは、少なくとも重みのサブセットが選択された事象において選択されたユーザに情報を送信するのに適用可能であるために適合されることを特徴とする請求項1に記載の方法。
- 前記送信重みの第1のサブセットが請求項2に記載の方法に従って適合され、
前記送信重みの第2のサブセットが請求項3に記載の方法に従って適合されることを特徴とする請求項1に記載の方法。 - 前記手順が複数回実行されることを特徴とする請求項1乃至4のいずれかに記載の方法。
- 前記送信重みを適合させる工程は、
現在と以前の測定レポートと送信重みとを適用して、最良の重みのサブセットを導出し、
前記サブセットを用いて前記適合された送信重みを生成することを特徴とする請求項1乃至5のいずれかに記載の方法。 - 前記適合された送信重みは、ランダム摂動と組み合わせ、前記最良の重みの中の前記最良のサブセットの線形結合によって生成されることを特徴とする請求項6に記載の方法。
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/SE2003/002071 WO2005062496A1 (en) | 2003-12-22 | 2003-12-22 | A method for determining transmit weights |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2007521708A JP2007521708A (ja) | 2007-08-02 |
JP4435737B2 true JP4435737B2 (ja) | 2010-03-24 |
Family
ID=34709479
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2005512359A Expired - Fee Related JP4435737B2 (ja) | 2003-12-22 | 2003-12-22 | 送信重みを決定する方法 |
Country Status (9)
Country | Link |
---|---|
US (1) | US7406336B2 (ja) |
EP (1) | EP1700397B1 (ja) |
JP (1) | JP4435737B2 (ja) |
CN (1) | CN1886915B (ja) |
AT (1) | ATE491269T1 (ja) |
AU (1) | AU2003290487A1 (ja) |
DE (1) | DE60335305D1 (ja) |
TW (1) | TW200537835A (ja) |
WO (1) | WO2005062496A1 (ja) |
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2003
- 2003-12-22 AT AT03783024T patent/ATE491269T1/de not_active IP Right Cessation
- 2003-12-22 EP EP03783024A patent/EP1700397B1/en not_active Expired - Lifetime
- 2003-12-22 AU AU2003290487A patent/AU2003290487A1/en not_active Abandoned
- 2003-12-22 US US10/596,688 patent/US7406336B2/en not_active Expired - Fee Related
- 2003-12-22 WO PCT/SE2003/002071 patent/WO2005062496A1/en not_active Application Discontinuation
- 2003-12-22 CN CN2003801108723A patent/CN1886915B/zh not_active Expired - Fee Related
- 2003-12-22 DE DE60335305T patent/DE60335305D1/de not_active Expired - Lifetime
- 2003-12-22 JP JP2005512359A patent/JP4435737B2/ja not_active Expired - Fee Related
-
2004
- 2004-11-11 TW TW093134543A patent/TW200537835A/zh unknown
Also Published As
Publication number | Publication date |
---|---|
CN1886915A (zh) | 2006-12-27 |
CN1886915B (zh) | 2010-06-09 |
DE60335305D1 (de) | 2011-01-20 |
US20070099666A1 (en) | 2007-05-03 |
AU2003290487A1 (en) | 2005-07-14 |
JP2007521708A (ja) | 2007-08-02 |
TW200537835A (en) | 2005-11-16 |
EP1700397B1 (en) | 2010-12-08 |
ATE491269T1 (de) | 2010-12-15 |
WO2005062496A1 (en) | 2005-07-07 |
US7406336B2 (en) | 2008-07-29 |
EP1700397A1 (en) | 2006-09-13 |
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