JP2012531876A - 組み合わせ無線信号を制御するシステムおよび方法 - Google Patents
組み合わせ無線信号を制御するシステムおよび方法 Download PDFInfo
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- 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
- H04L27/2614—Peak power aspects
- H04L27/2615—Reduction thereof using coding
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- H—ELECTRICITY
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
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- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
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- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
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Abstract
【解決手段】少なくとも2つの信号を定義する情報を受信し、それぞれ異なる組み合わせを定義し、少なくとも2つの異なる方法で、少なくとも2つの互換表示を用いた変換される情報を組み合わせ、同一情報の少なくとも2つの互換表示を有する少なくとも1つの信号として、直交周波数多重信号コンポーネントを有する表示の信号を定義する情報を変換し、少なくとも1つの基準として異なる組み合わせのそれぞれを解析し、解析に基づいて選択された少なくとも2つの信号のそれぞれから変換される情報の選択される組み合わせを表示する。
【選択図】図3
Description
domain multiplexing)またはOFDM、および直交周波数領域多重アクセス(orthogonal
frequency domain multiplexing access : OFDMA)のような密接に関わる方式である。OFDMチャネルで送信される信号のために、狭い隣接サブチャネルのバンドルによる周波数ドメイン、およびガード・インターバルΔT(図1参照)で分割され、それぞれ時間TであるOFDMシンボルの低速列に関するタイム・ドメインを特徴とする。それぞれのシンボルの前のガード・インターバルの中は、シンボル周期に同じ信号を含み、時間内に循環シフトするサイクリック・プレフィックス(cyclic prefix : CP)である。CPは、高層ビルや丘などのような地形の大きな障害物で無線信号が反射されて生じるマルチパスの中で正確な時間同期で受信される信号の感度を下げるように設計されている。非常に短い時間の遅れ(ΔTより短い)で信号が受信された場合、エラー無しで受信されることになる。OFDMのペイロードに関するデータ・シンボルに加えて、設定タイミングと他の基準の一般的なプリアンブル信号である。プリアンブルは、CP自身である場合があり、図1では省略している。
Symposium on Signal Processing and Information Technologyの821-827頁にHanna Boguckaによる技術解説記事として“Directions and Recent Advances in
PAPR Reduction Methods”があり、それを参照することにより援用する。PAPR抑圧法は、CF(clipping and filtering)法、符号化、TR(tone reservation)法、tone injection法、ACE(active constellation extension,)法、部分系列伝送(partial transmit sequence (PTS))、選択マッピング(selective mapping (SLM))およびインターリーブのような多重信号表示を含む。それらの技術はPAPR抑制を顕著におこなうことができるが、送信信号電力が増加し、ビットエラー率(BER)の増加、データ率ロス、複雑な計算の増加がある。さらに、それらの技術は、受信された信号を正確にデコードする目的で、信号自身と一緒に追加のサイド情報(信号の変換について)の伝送を求める。そのようなサイド情報は技術の汎用性を低下させ、とりわけの技術は種々のベースステーションの送信機からの信号を受信する単純なモバイル受信機である。互換性の範囲として、Boguckaの開示された技術および当該分野で公知の技術を以下に説明する手法と組み合わせて使用できる。
Clipping and Filtering on the Performance of OFDM", IEEE Commun. Lett.,
Vol. 2, No. 5, pp. 131-133, May, 1998参照)、部分系列伝送(PTS)法(たとえばL. J Cimini and N. R. Sollenberger, "Peak-to-Average
Power Ratio Reduction of an OFDM Signal Using Partial Transmit
Sequences",IEEE Commun. Lett., Vol. 4, No. 3, pp. 86-88, March, 2000参照)、およびcyclic shift sequence(CSS)法(たとえばG. Hill and M. Faulkner, "Cyclic Shifting
and Time Inversion of Partial Transmit Sequences to Reduce the Peak-to-Average
Ratio in OFDM", PIMRC 2000, Vol.2, pp. 1256-1259, Sep. 2000参照)がある。さらに、非線形送信アンプが使用されたときに、OFDM送信の受信特徴を改善するために、電力損失最小クリップ方式(MCPLS)を使用したPTS法が送信アンプ(たとえば、Xia Lei, Youxi Tang, Shaoqian Li, "A
Minimum Clipping Power Loss Scheme for Mitigating the Clipping Noise in
OFDM", GLOBECOM 2003, IEEE, Vol. 1, pp. 6-9, Dec. 2003参照)でクリップされた省電力損失を提案している。MCPLSはcyclic shifting sequence(CSS)法に適用することもできる。
"A Novel Peak Power Reduction Scheme for OFDM", Proc. of PIMRC '97,
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R. Hill, Faulkner, and J. Singh, "Deducing the Peak-to-Average Power -Ratio
in OFDM by Cyclically Shifting Partial Transmit Sequences", Electronics
Letters, Vol. 36,No. 6, 16th March, 2000参照)の抑制目的で、信号変調前のそれぞれのサブキャリアの位相回転に使用される。
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Claims (43)
- 直交周波数多重信号コンポーネントを備える少なくとも2つの信号の組み合わせを表示する組み合わせ波形を制御する方法であって、
前記少なくとも2つの信号を定義する情報を受信し、
それぞれ異なる組み合わせを定義する少なくとも2つの異なる方法において、少なくとも1つの信号が同一情報の少なくとも2つの互換表示を備え、少なくとも2つの互換表示で使用する変換された信号を組み合わせ、直交周波数多重信号コンポーネントを備える表示にそれぞれの信号を定義する情報を変換し、
少なくとも1つの基準についてそれぞれ異なる組み合わせを解析し、
前記解析に基づいて選択された少なくとも2つの信号のそれぞれから変換された情報の選択された組み合わせを含むそれぞれの組み合わされた波形を表現する情報を出力する
ことを含む方法。 - 変換された情報の第1組み合わせと第2組み合わせが、(a)第2信号について第1信号の周波数コンポーネントの変調の相対的タイミングおよび(b)信号の周波数コンポーネントの相対的位相の少なくとも1つにについて異なる請求項1の方法。
- 前記少なくとも1つの基準がピーク対平均電力比(PAPR)を含む請求項1および2のいずれかの方法。
- 前記信号が、直交周波数分割多重信号を含む請求項1から3のいずれかの方法。
- 少なくとも1つの信号は、プロトコルの外で送信された追加の情報無しで少なくとも2つの異なる組み合わせを復調する少なくとも1つのプロトコルに準拠している受信機であるIEEE802.11プロトコル、IEEE802.16プロトコル、3GPP−LTE
downlinkプロトコル、DABプロトコル、およびDVBプロトコルのグループから選択される少なくとも1つのプロトコルに互換性のある直交周波数分割多重ストリームを含む請求項1から4のいずれかの方法。 - 前記少なくとも2つの互換表示は、変調列のサイクリック・タイム・シフトでそれぞれ異なる請求項1から5のいずれかの方法。
- 互換表示は、最低ピーク対平均電力比の結果が組み合わせるために選択され、前記少なくとも1つの基準がピーク対平均電力比(PAPR)を含み、前記少なくとも2つの互換表示は、変調列のサイクリック・タイム・シフトでそれぞれ異なる請求項1から6のいずれかの方法。
- 少なくとも前記解析が超電導ディジタル回路ロジックを用いて実行される請求項1から7のいずれかの方法。
- 前記解析することが、それぞれの組み合わせのダイナミックレンジについて解析することを含む請求項1から8のいずれかの方法。
- 前記解析することが、信号の1つのために設計された参照受信機の予測されたエラー率について解析することを含む請求項1から9のいずれかの方法。
- 前記解析することが、組み合わされた波形のピーク対平均電力比と信号の1つのために受信機の予測されたエラー率について解析することを含む請求項1から10のいずれかの方法。
- 前記解析することが、組み合わされた波形のクリッピング歪みについて解析することを含む請求項1から11のいずれかの方法。
- 前記出力することが、周波数変換無しに送信に適した組み合わされた信号のディジタル表示から無線周波数アナログ信号に直接変換した選択された組み合わされた信号を出力することを含む請求項1から12のいずれかの方法。
- 前記出力することが、組み合わされた信号の中間周波数表示を出力することを含む請求項1から13のいずれかの方法。
- 前記出力することが、選択された組み合わされた信号の中にディジタル・ベースバンド信号を変換するためのパラメータのセットを出力することを含む請求項1から14のいずれかの方法。
- 選択された組み合わされた信号の中間周波数および無線周波数表示の少なくとも1つをプレディストーションすることを含む請求項1から15のいずれかの方法。
- 前記プレディストーションすることは、選択された組み合わされた信号を使用する通信のアナログ無線通信システムのアナログ非線形、通信チャネル障害、および受信機特性の1または複数の少なくとも一部を補償する請求項16の方法。
- 前記プレディストーションすることは、選択された組み合わされた信号を増幅するパワーアンプの非線形歪みを補償する請求項16の方法。
- 前記少なくとも2つの信号のそれぞれが、それぞれのサイクリック・タイム・シフトで異なる2つの互換表示する、サイクリック・プレフィックスを備える直交周波数領域多重信号を含む請求項1から18のいずれかの方法。
- 前記少なくとも2つの信号のそれぞれが、通信プロトコルに一致する直交周波数分割多重信号として受信され、前記信号の少なくとも1つが少なくとも2つの互換表示を生成するために修正され、前記少なくとも1つの基準が、選択された組み合わされた信号が最低ピーク対平均電力比で表示される組み合わされた信号である組み合わされた信号のピーク対平均電力比を含む請求項1から19のいずれかの方法。
- それぞれの信号が、チャネル内の変調された直交周波数コンポーネントの位相、振幅またはその両方のセットを含み、複数のチャネルのそれぞれにおいて複数の信号を組み合わせる方法であって、
複数の信号のそれぞれで異なる情報を受信し、
複数の直交周波数多重信号コンポーネントとして複数の信号を表現し、
同一情報を表示するそれぞれ変換された表示を、少なくとも2つの異なる方法で少なくとも1つの表示を変換し、
少なくとも2つの異なる変換に少なくとも1つの信号の互換表示を含む複数の表示のそれぞれで、複数の信号の複数の異なる組み合わせの少なくとも1つの適切な基準について解析し、
前記解析に基づいて組み合わせを選択し、
前記選択された組み合わせの少なくとも1つの識別、選択された組み合わせ、および選択された組み合わせを定義する情報を出力する
ことを含む方法。 - 前記信号が直交周波数分割多重信号を含み、
変換された情報の第1組み合わせと第2組み合わせが、(a)第2信号について第1信号の周波数コンポーネントの変調の相対的タイミングおよび(b)信号の周波数コンポーネントの位相の少なくとも1つにについて異なり、
少なくとも1つの基準がピーク対平均電力比(PAPR)を含み、
選択された組み合わせが最低ピーク対平均電力比の組み合わせを含む
請求項21の方法。 - それぞれの変換された表示が変調列でサイクリック・タイム・シフトの中でそれぞれ異なり、直交周波数分割多重信号がIEEE802.11プロトコル、IEEE802.16プロトコル、3GPP−LTE downlinkプロトコル、DABプロトコルおよびDVBプロトコルのグループから選択された少なくとも1つのプロトコルと互換性があり、受信機が前記プロトコルの外で送信される追加の情報の要求無しに少なくとも2つのそれぞれ異なる組み合わせを復号できる少なくとも1つのプロトコルに準拠する請求項22の方法。
- それぞれの変換された表示が変調列でサイクリック・タイム・シフトの中でそれぞれ異なり、組み合わせのために選択された最低ピーク対平均電力比の結果の互換表示で、少なくとも1つの基準がピーク対平均電力比(PAPR)を含む請求項21から23のいずれかの方法。
- 少なくとも前記解析が、超電導ディジタル回路ロジックを用いて実行される請求項21から24のいずれかの方法。
- 前記解析することが、増幅器のモデル内で組み合わされた波形のクリッピング歪みを解析することを含む請求項21から25のいずれかの方法。
- 前記出力が、周波数変更無しに送信に適した選択された組み合わせのディジタル表現から無線周波数アナログ信号に直接変換するための選択された組み合わされた信号を出力することを含む請求項21から26のいずれかの方法。
- 選択された結組み合わせの中間周波数および無線周波数表示の少なくとも1つをプレディストーションすることを含む請求項21から27のいずれかの方法。
- 前記プレディストーションすることは、選択された組み合わされた信号を使用する通信のアナログ無線通信システムのアナログ非線形、通信チャネル障害、および受信機特性の1または複数の少なくとも一部を補償する請求項28の方法。
- 直交周波数多重信号コンポーネントを備えた少なくとも2つの信号の組み合わせを表示し、組み合わされた波形を制御するための装置であって、
前記少なくとも2つの信号を定義する情報を受信するための入力ポートと、
それぞれ異なる組み合わせを定義する少なくとも2つの異なる方法において、少なくとも2つの互換表示を用いた変換される情報の組み合わせ、および同一情報の少なくとも2つの互換表示を備えた少なくとも1つの信号である、直交周波数多重信号コンポーネントを有する表現にそれぞれの信号を定義する情報を変換し、少なくとも1つの基準についてそれぞれ異なる組み合わせを解析するプロセッサーと、
前記解析に基づいて選択された少なくとも2つの信号のそれぞれから変換された情報の選択された組み合わせを含むそれぞれの組み合わされた波形を表現する情報を出力する出力ポートと、
を含む装置。 - 前記変換された情報の第1組み合わせおよび第2組み合わせが、(a)第2信号について第1信号の周波数コンポーネントの相対的変調のタイミング、および(b)少なくとも1つの基準がピーク対平均電力比(PAPR)を含み、信号の周波数コンポーネントの相対的位相について少なくもと1つが異なる請求項30の装置。
- 少なくとも1つの信号が、IEEE802.11プロトコル、IEEE802.16プロトコル、3GPP−LTE downlinkプロトコル、DABプロトコルおよびDVBプロトコルのグループから選択される少なくとも1つのプロトコルに準拠される直交周波数分割多重ストリームであり、受信機が前記プロトコルの外で送信される追加の情報を要求せずに少なくとも2つのそれぞれ異なる組み合わせを復号できる少なくとも1つのプロトコルに準拠する請求項30と31のいずれかの装置。
- 前記少なくとも2つの互換表示が変調列でサイクリック・タイム・シフトの中でそれぞれ異なり、組み合わせのために選択された最低ピーク対平均電力比の結果である互換表示で、少なくとも1つの基準がピーク対平均電力比を含む請求項30から32のいずれかの装置。
- 前記プロセッサーが、超電導ディジタル回路ロジックと復号プログラマブルロジックデバイスの少なくとも1つを含む請求項30から33のいずれかの装置。
- 前記出力ポートが、周波数変更無しで送信するのに適した組み合わされた信号のディジタル表示から無線周波数アナログ信号に直接変換して出力するように構成された請求項30から34のいずれかの装置。
- 前記プロセッサーが、選択された組み合わされた信号の中間周波数と無線周波数表示の少なくとも1つをプレディストーションするように構成された請求項30から35のいずれかの装置。
- 前記プレディストーションすることは、選択された組み合わされた信号を使用する通信のアナログ無線通信システムの受信機特性、送信チャネル障害、アナログ非線形の1または複数の少なくとも一部を補償する請求項36の装置。
- 前記少なくとも2つの信号のそれぞれが通信プロトコルに適合する直交周波数分割多重信号として受信され、少なくとも1つの信号が通信プロトコルの外で追加の情報の受信要求無しでプロトコルに適合した受信機で復号できる、少なくとも2つの互換表示の生成を修正され、少なくとも1つの基準が最小ピーク対平均電力比を表示する組み合わされた信号である選択された組み合わされた信号のピーク対平均電力比を含む請求項30から37のいずれかの装置。
- 複数の信号のそれぞれがチャネル内で変調された直交周波数コンポーネントの位相、振幅、またはその両方のセットを含み、複数のチャネルのそれぞれで複数の信号を組み合わせるための装置であって、
同じ情報を表示するおのおのの変換された表示で、少なくとも2つの異なる方法で少なくとも1つの信号の表示を変換し、複数の直交周波数多重信号コンポーネントとして表示され、複数の信号のそれぞれを定義する情報を受信し、少なくとも2つの異なる変換で少なくとも1つの信号の互換表示を含む複数の表示のおのおので、複数の信号の複数の異なる組み合わせの少なくとも1つの適合する基準について解析し、解析に基づいて組み合わせを選択するプロセッサーと、
選択された組み合わせの識別、選択された組み合わせ、および選択された組み合わせを定義するための情報の少なくとも1つを表示するための出力ポートと、
を備えた装置。 - 前記信号が直交周波数分割多重信号を含み、変換された情報の第1組み合わせと第2組み合わせが、(a)第2信号に第1信号の周波数コンポーネントの変調の相対的タイミング、(b)信号の周波数コンポーネントの相対的位相について、少なくとも1つが異なり、少なくとも1つの基準がピーク対平均電力比(PAPR)を含み、選択された組み合わせが最低ピーク対平均電力比を含む請求項39の装置。
- 変換された表示のそれぞれが変調列のサイクリック・タイム・シフトでそれぞれ異なり、直交周波数分割多重信号がIEEE802.11プロトコル、IEEE802.16プロトコル、3GPP−LTE downlinkプロトコル、DABプロトコルおよびDVBプロトコルのグループから選択された少なくとも1つのプロトコルに準拠し、受信機は前記プロトコルの外で送信される追加の情報の要求無しで少なくとも2つのそれぞれ異なる組み合わせを復号することができ、それぞれの変換された表示は変調列のサイクリック・タイム・シフトでそれぞれ異なり、少なくとも1つの基準がピーク対平均電力比(PAPR)を含み、組み合わせのために選択された最低ピーク対平均電力比の結果が互換表示である請求項39から40のいずれかの装置。
- 前記プロセッサーが超電導ディジタル回路ロジックおよび複合プログラマブルロジックデバイスの少なくとも1つを含む請求項39から41のいずれかの装置。
- 前記プロセッサーが増幅器のモデルで組み合わされた波形の非線形歪みを解析し、および選択された組み合わせの少なくとも1つのコンポーネントをプレディストーションする請求項39から42のいずれかの装置。
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EP2457354A2 (en) | 2012-05-30 |
EP2457354B1 (en) | 2020-09-09 |
CA2763134A1 (en) | 2010-12-26 |
CA2763134C (en) | 2021-01-19 |
CN107302512A (zh) | 2017-10-27 |
US20100329401A1 (en) | 2010-12-30 |
KR20170089880A (ko) | 2017-08-04 |
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EP2457354A4 (en) | 2017-07-05 |
KR101936533B1 (ko) | 2019-04-03 |
US20140056385A1 (en) | 2014-02-27 |
US20190173708A1 (en) | 2019-06-06 |
CN107302512B (zh) | 2021-10-15 |
WO2012030319A3 (en) | 2012-04-26 |
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