JP5048116B2 - マルチ搬送波cdmaシステムにおける同期化 - Google Patents
マルチ搬送波cdmaシステムにおける同期化 Download PDFInfo
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Description
また、幾つかの実施形態において、少なくとも1つの受信アンテナが少なくとも2つ以上の受信アンテナを備えていた場合、微同期位置の使用は、少なくとも2つ以上の受信アンテナのそれぞれからの微同期位置を組み合わせることを含む。
幾つかの実施形態において、少なくとも1つの受信アンテナは、複数の受信アンテナを含む。そして、この方法は、さらに、複数の受信アンテナからの複数の微同期位置を全体的な微同期位置として組み合わせる。
幾つかの実施形態において、受信トレーニングシーケンスは、共通同期チャネル副搬送波上または専用パイロットチャネル副搬送波上で受信される。
幾つかの実施形態において、OFDMフレームプレアンブル中において他のトレーニングシーケンスが受信される。
マルチセルラー環境でのシステムアクセスは、同じ共通のパイロットシンボルを送信する多くの送信機があるため、セル選択という新たな問題を招く。本発明の他の実施形態においては、先に紹介した送信ヘッダが受信機によって使用されることにより、システムアクセスおよびセル選択が行なわれる。
OFDMシンボル
9 共通同期副搬送波
10 MIMO−OFDM送信機
11 データシンボル
12 パイロットチャネル副搬送波
21 第1送信アンテナ
23 第2送信アンテナ
24 第1のOFDM部
25 パイロットチャネル副搬送波
26 第2のOFDM部
27 共通同期副搬送波
30 データOFDMシンボル
205 TPS OFDMシンボル
207 トレーニングOFDMシンボル
300 プリアンブル
302 分散パイロット
304 トラフィックデータシンボル
400,402 フィンガー
404,406,700,702,704,706,708,710 副搬送波
500 OFDMスーパーフレーム
502 10msOFDMフレーム
504 TPSフレーム
506 スロット
508 プリアンブルOFDMシンボル
510 レギュラーデータシンボル
603,605,712,714 ヘッダOFDMシンボル
607 プレフィックス
734 第1受信アンテナ
735 第2受信アンテナ
736 RF受信機
737,741 粗同期装置
738,740,742 ブロック
739 RF受信機
744,746,748 FFT
745 第1の相関器ブロック
751 加算器
753 乗算器
755 相関器
Claims (19)
- 少なくとも1つの受信アンテナを備え、少なくとも1つの送信アンテナを備えた送信機との通信を行なう直交周波数分割多重化(OFDM)受信機において同期を行なう方法であって、
前記少なくとも1つの受信アンテナのそれぞれにおいて、受信信号をサンプリングして複数の時間領域サンプルの各セットを形成し、
少なくとも1つの粗同期位置を決定し、
前記少なくとも1つの受信アンテナのそれぞれにおいて、
a)前記少なくとも1つの粗同期位置のうちの1つに関する複数の微同期位置候補のそれぞれについて、
i)受信アンテナ毎に、当該微同期位置候補に対して高速フーリエ変換(FFT)ウインドウを位置決めするとともに、FFTにより、前記時間領域サンプルを複数の周波数領域成分の各セットに変換し、
ii)前記少なくとも1つの送信アンテナのそれぞれについて、前記複数の周波数領域成分のセットから、当該少なくとも1つの送信アンテナのそれぞれに対応する受信された各トレーニングシーケンスを抽出し、
iii)前記少なくとも1つの送信アンテナのそれぞれについて、受信された各トレーニングシーケンスと周知の各送信トレーニングシーケンスとの間の相関を計算して複数の相関を算出し、
iv)前記少なくとも1つの送信アンテナについての前記複数の相関を組み合わせて、同期位置候補のそれぞれについて全体の相関結果を形成し、
b)前記複数の相関結果から微同期位置を決定し、
前記少なくとも1つの受信アンテナのそれぞれからの前記微同期位置を、全体の微同期位置に使用する、方法。 - 粗同期位置は、受信アンテナのそれぞれについて決定されるとともに、各前記微同期位置を決定するために使用される、請求項1に記載の方法。
- 粗同期位置は受信アンテナのそれぞれについて決定され、当該複数の粗同期位置のうち、最も早い位置が使用されて、全ての受信アンテナについて微同期位置が決定される、請求項1に記載の方法。
- 前記粗同期位置は、2つのOFDMシンボル持続時間にわたって前記複数の時間領域サンプル間の相関ピークを探すことにより、少なくとも1つの受信アンテナについて時間領域において決定される、請求項2に記載の方法。
- 前記少なくとも1つの受信アンテナが少なくとも2つ以上の受信アンテナを備えていた場合、前記微同期位置の使用は、当該少なくとも2つ以上の受信アンテナのそれぞれからの微同期位置を組み合わせることを含む、請求項1に記載の方法。
- 前記微同期位置の組み合わせは、前記微同期位置のうち最も早い微同期位置を選択することを含む、請求項5に記載の方法。
- 前記時間領域サンプルの形成は、少なくとも3つのOFDMシンボル持続時間において行なわれ、
前記粗同期位置の決定は、
a)1つのOFDMシンボル持続時間を有する第1の期間中に受信した時間領域サンプルの第1のセットと、第1の期間の直ぐ次の第2の期間であってOFDMシンボル持続時間を有する第2の期間中に受信した時間領域サンプルの第2のセットとの間で計算された相関である複数の相関値のそれぞれを、前記第1の期間における複数の開始時間のそれぞれにおいて計算し、
b)前記複数の相関値で最大となる粗同期位置を特定する、
ことにより、2つのOFDMシンボル持続時間にわたって受信した前記時間領域サンプル間の相関ピークを探し、前記時間領域で粗同期を行い、粗同期位置を特定することを含む、請求項1に記載の方法。 - 前記全体の相関結果の形成は、同期位置候補毎に前記少なくとも1つの送信アンテナについての前記複数の相関を一緒に乗算することを含む、請求項1に記載の方法。
- 送信アンテナが1つで且つ受信アンテナが1つのシステムに対して適用される、請求項1に記載の方法。
- 前記トレーニングシーケンスは、共通同期チャネル副搬送波上又は専用パイロットチャネル副搬送波上で受信される、請求項1に記載の方法。
- 前記トレーニングシーケンスは、OFDMフレームプリアンブル中に受信される、請求項10に記載の方法。
- 少なくとも1つの送信アンテナを備えた送信機との通信を行なう直交周波数分割多重化(OFDM)受信機であって、
少なくとも1つの受信アンテナと、
前記少なくとも1つの受信アンテナ毎に設けられ、受信信号をサンプリングして複数の時間領域サンプルの各セットを形成する受信回路と、
少なくとも1つの粗同期位置を決定する粗同期装置と、
少なくとも1つの高速フーリエ変換(FFT)変換器と、少なくとも1つの相関器と、少なくとも1つのコンバイナとを備える微同期装置であって、少なくとも1つの受信アンテナのそれぞれで、
a)前記少なくとも1つの粗同期位置のうちの1つに関する複数の微同期位置候補のそれぞれについて、
i)受信アンテナ毎に、当該微同期位置候補に対してFFTウインドウを位置決めするとともに、FFTにより、前記時間領域サンプルを複数の周波数領域成分の各セットに変換し、
ii)前記少なくとも1つの送信アンテナのそれぞれについて、前記複数の周波数領域成分のセットから、当該少なくとも1つの送信アンテナのそれぞれに対応する受信された各トレーニングシーケンスを抽出し、
iii)前記少なくとも1つの送信アンテナのそれぞれについて、受信された各トレーニングシーケンスと周知の各送信トレーニングシーケンスとの間の相関を計算して複数の相関を算出し、
iv)前記少なくとも1つの送信アンテナについての前記複数の相関を組み合わせて、同期位置候補のそれぞれについて全体の相関結果を形成し、
b)前記複数の相関結果から微同期位置を決定する、微同期装置と、
を備え、
前記少なくとも1つの受信アンテナからの前記微同期位置候補を組み合わせて全体の微同期位置とするようになっているOFDM受信機。 - 前記少なくとも1つの受信アンテナは、少なくとも2つの受信アンテナを有し、
前記OFDM受信機は、前記微同期位置のうちの最も早い位置を選択することにより、前記少なくとも2つの受信アンテナからの前記微同期位置を組み合わせて全体の微同期位置とする、請求項12に記載のOFDM受信機。 - 前記相関の組み合わせは、前記微同期位置候補毎に前記少なくとも1つの送信アンテナについての前記複数の相関を一緒に乗算することにより行なわれる請求項12に記載のOFDM受信機。
- 共通同期チャネル副搬送波上または専用パイロットチャネル副搬送波上で前記トレーニングシーケンスを受信するようになっている、請求項12に記載のOFDM受信機。
- 直交周波数分割多重化(OFDM)受信機において同期を行なう方法であって、
少なくとも1つの受信アンテナのそれぞれにおいて、受信トレーニングシーケンスを含む受信OFDM信号をサンプリングして複数の時間領域サンプルの各セットを形成するステップと、
前記受信トレーニングシーケンスと当該トレーニングシーケンスのローカルコピーとの間における複数の相関に基づいて同期を行なうステップと、を備え、
前記同期を行なうステップは、周波数領域において行なわれ、
前記受信トレーニングシーケンスは、前記受信OFDM信号の被選択副搬送波上にある周波数領域のトレーニングシーケンスであって、
前記OFDM受信機は、少なくとも1つの送信アンテナを有する送信機との通信を行ない、
前記同期を行なうステップは、前記少なくとも1つの受信アンテナのそれぞれにおいて、
a)複数の微同期位置候補のそれぞれについて、
i)当該微同期位置候補に対して高速フーリエ変換(FFT)ウインドウを位置決めすると共に、FFTにより、前記時間領域サンプルを複数の周波数領域の各セットに変換し、
ii)前記少なくとも1つの送信アンテナのそれぞれについて、前記複数の周波数成分のセットから、当該少なくとも1つの送信アンテナのそれぞれに対応する受信トレーニングシーケンスを抽出し、
iii)前記少なくとも1つの送信アンテナのそれぞれについて、各受信トレーニングシーケンスと周知の各送信トレーニングシーケンスとの間の相関を計算して複数の相関を算出し、
iv)前記少なくとも1つの送信アンテナについての前記複数の相関を組み合わせ、同期位置候補のそれぞれについて全体的な相関結果を形成し、
b)前記複数の全体的な相関結果から微同期位置を決定する、
ことを特徴とする方法。 - 前記少なくとも1つの受信アンテナは、複数の受信アンテナを含み、
前記方法は、さらに、前記複数の受信アンテナからの複数の微同期位置を全体的な微同期位置として組み合わせることを特徴とする請求項16に記載の方法。 - 前記受信トレーニングシーケンスは、共通同期チャネル副搬送波上または専用パイロットチャネル副搬送波上で受信されることを特徴とする請求項17に記載の方法。
- OFDMフレームプレアンブル中において他のトレーニングシーケンスが受信されることを特徴とする請求項18に記載の方法。
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