JP2009535936A - 無線通信システムにおいて基準信号を割り当てるための方法及び装置 - Google Patents
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- H04J—MULTIPLEX COMMUNICATION
- H04J13/00—Code division multiplex systems
- H04J13/0007—Code type
- H04J13/0055—ZCZ [zero correlation zone]
- H04J13/0059—CAZAC [constant-amplitude and zero auto-correlation]
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- H04L27/2601—Multicarrier modulation systems
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2627—Modulators
- H04L27/2628—Inverse Fourier transform modulators, e.g. inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators
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- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/22—TPC being performed according to specific parameters taking into account previous information or commands
- H04W52/223—TPC being performed according to specific parameters taking into account previous information or commands predicting future states of the transmission
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Abstract
【選択図】図5
Description
am(k)=exp[j2p(m/N)[k(k+1)/2+qk]] Nが奇数の場合
am(k)=exp[j2p(m/N)[k2/2+qk]] Nが偶数の場合
ZC定義の代替の規則では、上記の公式の「j」(単位複素数)が「−j」に置き換えられる。いずれの規則を採用することもできる。代表的なCAZACの例に関しては、2003年、John Wiley and Sons社のK.Fazel及びS.Keiser著「マルチキャリア及びスペクトラム拡散システム」の53頁から引用した(Fazel及びKeiser氏の著書は、その全体が本明細書に引用として組み入れられる)。上記の公式では、「m」及び「N」は、相対的に素数であり、「q」は、任意の固定小数点整数である(例えば、q=0の場合qk=0となり計算が簡単になるので、q=0は適切な選択である)。また、「N」は系列長であり、「k」は系列要素のインデックス(kは{0、1、...、N−1})であり、「m」は、ルートZC系列のインデックスである。「N」を素数にすると、最適な相互相関を有するルートZC系列の組が最大化される。したがって、「N」が素数の場合、「m」に関しては「(N−1)」個の選択が可能であり、この場合、個々の選択により異なるルートZC CAZAC系列が得られる。Zadoff−Chu、ZC、及びZC CAZACという語は、一般に同義的に使用される。CAZACという語は、ZC又はそれ以外のような任意のCAZAC系列を意味する。
m=f(t,x)
s=g(t,x)
Claims (11)
- 無線領域に割り当てられたパラメータに基づいて基準シーケンスを生成する基準信号生成器を備えた装置であって、
前記パラメータは、前記無線領域の第1の装置によって第1の時間中に送信される第1の基準シーケンスを指定し、前記第1の基準シーケンスは、前記第1の無線領域に隣接する第2の無線領域の第2の装置に割り当てられた第2の基準シーケンスとは異なり、前記基準シーケンス生成器は、
前記パラメータに基づいて前記第1の時間のための巡回シフトを選択するための巡回シフトセレクタと、
前記選択された巡回シフトに基づいて前記第1の基準信号を巡回シフトするための巡回シフタと、
前記巡回シフトされた第1の基準シーケンスを送信するための送信アダプタと、
を含む、
ことを特徴とする装置。 - 前記巡回シフトセレクタは、前記パラメータに基づいて第2の時間のための第2の巡回シフトを選択するようになっており、前記巡回シフタは、前記選択された第2の巡回シフトに基づいて前記第2の時間中に前記基準シーケンスを巡回シフトするようになっている、請求項1に記載の装置。
- 前記パラメータは、フレーム番号、サブフレームオフセット、スロットオフセット、送信シンボルオフセット、無線領域識別子、ノードB識別子、ユーザエンドポイント識別子、又はグループ識別子のうちの少なくとも1つを含む、請求項1又は請求項2に記載の装置。
- 前記巡回シフトセレクタは、一連のシフトリストから前記パラメータを取得するようになっている、請求項1又は請求項2に記載の装置。
- 前記基準信号生成器は、ランダムな基準シーケンスを生成するようになっている、請求項1又は請求項2に記載の装置。
- 前記基準信号生成器は、前記第1の無線領域に割り当てられた基準シーケンスの組から前記パラメータに基づいて前記基準シーケンスを選択するためのシーケンスセレクタをさらに備える、請求項1又は請求項2に記載の装置。
- 前記シーケンスセレクタは、一連の参照リストから前記パラメータを取得するようになっている、請求項1に記載の装置。
- 前記選択された基準シーケンスを変調するための変調器をさらに含み、該変調器は、
前記生成された基準シーケンスのフーリエ変換を行うためのフーリエ変換モジュールと、
逆フーリエ変換を行うための逆フーリエ変換モジュールと、
前記フーリエ変換の出力を、選択された前記逆フーリエ変換の入力にマッピングするためのインタフェースと、
を備える、請求項1又は請求項2に記載の装置。 - 無線領域に割り当てられたパラメータに基づいて基準信号のシーケンスを生成するステップを含む方法であって、
前記パラメータは、前記無線領域の第1の装置によって第1の時間中に送信される第1の基準シーケンスを指定し、前記第1の基準シーケンスは、前記第1の無線領域に隣接する第2の無線領域の第2の装置に割り当てられた第2の基準シーケンスとは異なり、前記基準シーケンスの生成は、
前記パラメータに基づいて前記第1の時間の巡回シフトを選択するステップと、
前記選択された巡回シフトに基づいて前記第1の基準信号を巡回シフトするステップと、
前記巡回シフトされた第1の基準シーケンスを送信するステップと、
を含む、
ことを特徴とする方法。 - 前記パラメータに基づいて第2の時間のための第2の巡回シフトを選択するステップをさらに含み、
前記巡回シフトするステップは、前記選択された第2の巡回シフトに基づいて前記第2の時間中に前記基準シーケンスを巡回シフトするステップを含む、請求項9に記載の方法。 - 前記選択された基準シーケンスを変調するステップをさらに含み、該変調は、
前記生成された基準シーケンスのフーリエ変換を行うステップと、
逆フーリエ変換を行うステップと、
前記フーリエ変換を行うステップから得られた出力を、前記逆フーリエ変換を行うための選択された入力にマッピングするステップと、
を含む、請求項9又は請求項10に記載の方法。
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PCT/US2007/067598 WO2007127902A2 (en) | 2006-04-27 | 2007-04-27 | Methods and apparatus to allocate reference signals in wireless communication systems |
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Also Published As
Publication number | Publication date |
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US9444650B2 (en) | 2016-09-13 |
KR20080110937A (ko) | 2008-12-19 |
EP2016683A2 (en) | 2009-01-21 |
JP5017736B2 (ja) | 2012-09-05 |
CN101479951B (zh) | 2013-10-30 |
WO2007127902A3 (en) | 2008-07-31 |
WO2007127902A2 (en) | 2007-11-08 |
EP2016683A4 (en) | 2014-07-16 |
CN103312486B (zh) | 2017-12-26 |
KR101035456B1 (ko) | 2011-05-18 |
US20070253465A1 (en) | 2007-11-01 |
CN103312486A (zh) | 2013-09-18 |
CN101479951A (zh) | 2009-07-08 |
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