JP2008526137A - Mimo設計用の容量ベースのランク予測 - Google Patents
Mimo設計用の容量ベースのランク予測 Download PDFInfo
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Abstract
【選択図】なし
Description
一つの観点において、ランク予測の方法は、各トーンごとの層送信に対応するMIMOチャネル行列を算出することと、MIMOチャネル行列に基づいて各トーンごとの信号対ノイズ比(SNRs)を算出することと、各層送信ごとの実効SNRsを生成するために各トーンごとのSNRをマッピングすることと、実効SNRsに対応し、Cap 1、Cap 2、Cap 3、Cap 4と表記される付加的白色ガウスノイズ(additive white Gaussian noise)(AWGN)容量を算出することと、最高Capsのうちの絶対最高Capを選択することと、選択された絶対最高Capに基づいてランクを選択することとを具備する。
本発明の特徴と特性は、似通った参照記号が全体を通して対応して識別している図面と関連されると、以下に記載した詳細な説明からより明らかになる。
「例示的」ということばはここにおいて、「一例、例、あるいは実例として」という意味で使用される。ここにおいて「例示的」と記載されているいかなる実施例または設計も、必ずしも他の実施例または設計よりも好ましいあるいは有利であると解釈されるものではない。
図1は従来のSCW送信機100を図示している。ビット102はレート予測アルゴリズム112によって特定されるパケットフォーマット(PF)108、110次第で、ターボ符号化され(turbo-encoded)104、QAMマッピングされる106。符号化は単一入力単一出力(SISO)設計と同一である。符号化された記号はその後 MT の層116にデマルチプレクス(de-multiplex)され114、その後 MT のOFDM変調器120とアンテナ122とに空間的にマッピングされる118。各送信アンテナのOFDM処理はその後SISOと同一の方式で進み、その後信号はMIMO無線チャネルに送ら(launch)れる。レート予測アルゴリズムは5ミリ秒毎に受信機126からの4ビットCQIフィードバック124を用いる。CQIは受信機において測定された実効SNR/空間層の単位(measure)である。空間マッピングは、各層のSNRが類似であることを保証するように行われる。上記で説明した通り、この設計の性能は低ランクチャネルにおいて低下する。
実施例に従って、ランク予測を有する単一コードワード(SCW)設計が説明される。頑強なランク予測のためのアルゴリズムを以下に示す。SNR<15デシベル(ユーザの90パーセント)に関して、低複雑性MMSE受信機及びランク予測を有するSCW設計の性能は連続干渉除去(SIC)を有するマルチプルコードワード(MCW)設計と同様である。HARQがなければ、MCQはチャネル推定エラーに対してより敏感であるため、SCWはMCWよりすぐれている。これらのファクタは、MCWに比較して低い実施複雑性および少ないオーバーヘッドのために、MIMOに関してSCWを魅力的なものにする。
空間マッパ(プレコーダ(precoder))218は各OFDMトーンkごとに、MT のアンテナ上にMの記号をマッピングする MT ×M行列P(k)である。プレコーダについては様々な選択がありうる。MR ×MT のMIMOチャネルH(k)を考察する。プレコーダ行列は、同等なチャネル行列H(k)P(k)がH(k)と比較して改良された周波数選択性を有するように選択可能である。増加した周波数選択性は周波数ダイバーシチ利得を得るために復号器によって利用されることができる。
現在のSISO設計は、スペクトル効率[0.5、1、1.5、2.0、2.5、3.0、4.0]bps/Hzを有する7つのPFを使用する。1層送信を用いるSCW設計において、スペクトル効率(SE)におけるこの粒度(granularity)は十分でなければならない。しかし、全4つの層が送信用に使用されると、2〜4bps/Hz程度のSE粒度を有する[2、4、6、8、10、12、16]bps/Hzのスペクトル効率になる。これらのユーザは達成可能なSEよりもはるかに低いデータレートで送信するよう制約をされているので、この粗い粒度の結果はデータレートの損失である。各層中のレートは独立して調節されることができ、その結果、全体的なさらに細いスペクトル効率粒度になるので、SICを有するMCW設計にはこの粒度問題はない。
図5は1実施例による容量ベースのランク予測のブロック図を示している。k番目のトーンに関して、H(k)P4(k)502からH(k)P1(k)508はそれぞれMMSE512からMMSE518に入力される。MMSE512からMMSE518はそれぞれSNR4(k)522からSNR1(k)528を生成する。SNR4(k)522からSNR1(k)528はそれぞれキャップマッパ532からキャップマッパ538に入力される。キャップマッパ532からキャップマッパ538はEffSNR4542からEffSNR1548をそれぞれ生成すると共に、Cap4552からCap1558をそれぞれ生成する。Cap4552からCap1558は決定ユニット570に入力される。決定ユニット570はランク572を生成する。
1.各トーンにおいて、{1、2、3、4}層送信に相当する4×4、4×3、4×2及び4×1のMIMOチャネル行列H(k)P1(k)、H(k)P2(k)、H(k)P3(k)及びH(k)P4(k)が算出される。MMSE受信機を仮定すると、{1、2、3、4}層送信の後処理(post-processing)SNRs、すなわちSNR1(k)、SNR2(k)、SNR3(k)、SNR4(k)が以下のように各トーン毎に算出される:
Claims (20)
- 各トーンごとの層送信に対応するMIMOチャネル行列を算出することと;
前記MIMOチャネル行列に基づいて各トーンごとの信号対ノイズ比(SNRs)を算出することと;
各層送信ごとの実効SNRsを発生するために各トーンごとの前記SNRをマッピングすることと;
前記実効SNRsに対応し、Cap1、Cap2、Cap3、Cap4と表記される付加的白色ガウスノイズ(AWGN)容量を算出することと;
最高Capsのうちの絶対最高Capを選択することと;
前記選択した絶対最高Capに基づいてランクを選択することとを具備するランク予測の方法。 - 更に、前記選択したランクに基づいて品質インジケータを送信することを具備する、請求項1に記載の方法。
- 前記品質インジケータはキャリア品質対干渉(CQI)である、請求項2に記載の方法。
- 層送信の数は4つである、請求項1に記載の方法。
- 前記マッピングは容量に関して非制約である、請求項1に記載の方法。
- 各トーンごとの層送信に対応するMIMOチャネル行列を算出するための手段と;
前記MIMOチャネル行列に基づいて各トーンごとの信号対ノイズ比(SNRs)を算出するための手段と;
各層送信ごとの実効SNRsを発生するために各トーンごとの前記SNRをマッピングするための手段と;
前記実効SNRsに対応し、Cap1、Cap2、Cap3、Cap4と表記される付加的白色ガウスノイズ(AWGN)容量を算出するための手段と;
最高Capsのうちの絶対最高Capを選択するための手段と;
前記選択した絶対最高Capに基づいてランクを選択するための手段とを具備する無線通信装置。 - 更に、前記選択したランクに基づいて品質インジケータを送信するための手段を具備する、請求項9に記載の無線通信装置。
- 層送信の数は少なくとも2つである、請求項9に記載の無線通信装置。
- 前記品質インジケータはキャリア品質対干渉である、請求項10に記載の無線通信装置。
- ランク予測の方法を実行するようにプログラムされたプロセッサ、前記方法は、
各トーンごとの層送信に対応するMIMOチャネル行列を算出することと;
前記MIMOチャネル行列に基づいて各トーンごとの信号対ノイズ比(SNRs)を算出することと;
層送信ごとの実効SNRsを発生するために各トーンごとの前記SNRをマッピングすることと;
前記実効SNRsに対応し、Cap1、Cap2、Cap3、Cap4と表記される付加的白色ガウスノイズ(AWGN)容量を算出することと;
最高Capsのうちの絶対最高Capを選択することと;
前記選択した絶対最高Capに基づいてランクを選択することとを具備する。 - 前記方法は更に、前記選択したランクに基づいて品質インジケータを送信することを具備する、請求項13に記載のプロセッサ。
- 層送信の数は少なくとも2つである、請求項13に記載のプロセッサ。
- 前記品質インジケータはキャリア品質対干渉である、請求項14に記載のプロセッサ。
- ランク予測の方法を実行するコンピュータ可読媒体、前記方法は、
各トーンごとの層送信に対応するMIMOチャネル行列を算出することと;
前記MIMOチャネル行列に基づいて各トーンごとの信号対ノイズ比(SNRs)を算出することと;
各層送信ごとの実効SNRsを発生するために各トーンごとの前記SNRをマッピングすることと;
前記実効SNRsに対応し、Cap1、Cap2、Cap3、Cap4と表記される付加的白色ガウスノイズ(AWGN)容量を算出することと;
最高Capsのうちの絶対最高Capを選択することと;
前記選択した絶対最高Capに基づいてランクを選択することとを具備するコンピュータ可読媒体。 - 前記方法は更に、前記選択したランクに基づいて品質インジケータを送信することを具備する、請求項17に記載のコンピュータ可読媒体。
- 層送信の数は少なくとも2つである、請求項17に記載のコンピュータ可読媒体。
- 前記品質インジケータはキャリア品質対干渉である、請求項18に記載のコンピュータ可読媒体。
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US11/022,347 US7567621B2 (en) | 2004-07-21 | 2004-12-22 | Capacity based rank prediction for MIMO design |
PCT/US2005/047643 WO2006069397A2 (en) | 2004-12-22 | 2005-12-22 | Capacity based rank prediction for mimo design |
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JP2008544653A (ja) * | 2005-06-16 | 2008-12-04 | クゥアルコム・インコーポレイテッド | Mimoシステムのロバストランク予測 |
WO2010104016A1 (ja) | 2009-03-09 | 2010-09-16 | 日本電気株式会社 | ランク推定装置、受信機、通信システム、ランク推定方法及びプログラム記録媒体 |
JP2010537512A (ja) * | 2007-08-15 | 2010-12-02 | クゥアルコム・インコーポレイテッド | アップリンク制御チャネル・フォーマット |
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US9148256B2 (en) | 2004-07-21 | 2015-09-29 | Qualcomm Incorporated | Performance based rank prediction for MIMO design |
US9137822B2 (en) | 2004-07-21 | 2015-09-15 | Qualcomm Incorporated | Efficient signaling over access channel |
US8023589B2 (en) * | 2004-08-09 | 2011-09-20 | Texas Instruments Incorporated | Wireless MIMO transmitter with antenna and tone precoding blocks |
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UA90495C2 (ru) | 2010-05-11 |
AU2005318993A1 (en) | 2006-06-29 |
ZA200705129B (en) | 2009-09-30 |
RU2007128046A (ru) | 2009-01-27 |
EP1832032A2 (en) | 2007-09-12 |
RU2378767C2 (ru) | 2010-01-10 |
BRPI0519539A2 (pt) | 2009-02-17 |
KR20070094006A (ko) | 2007-09-19 |
IL183999A0 (en) | 2007-10-31 |
CN101124759A (zh) | 2008-02-13 |
US7567621B2 (en) | 2009-07-28 |
MX2007007757A (es) | 2007-11-09 |
NZ556045A (en) | 2010-12-24 |
KR100940466B1 (ko) | 2010-02-04 |
NO20073178L (no) | 2007-09-18 |
US20060018397A1 (en) | 2006-01-26 |
WO2006069397A2 (en) | 2006-06-29 |
CA2591609A1 (en) | 2006-06-29 |
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