JP3786129B2 - 直交周波数分割多重変復調回路 - Google Patents
直交周波数分割多重変復調回路 Download PDFInfo
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- JP3786129B2 JP3786129B2 JP2004240628A JP2004240628A JP3786129B2 JP 3786129 B2 JP3786129 B2 JP 3786129B2 JP 2004240628 A JP2004240628 A JP 2004240628A JP 2004240628 A JP2004240628 A JP 2004240628A JP 3786129 B2 JP3786129 B2 JP 3786129B2
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- JP
- Japan
- Prior art keywords
- frequency division
- division multiplexing
- demodulation circuit
- orthogonal frequency
- subcarriers
- Prior art date
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104 ランドマイザ
105 離散的逆フーリエ変換器
106 パラレルシリアル変換器
107 送信機
108 受信機
109 シリアルパラレル変換器
110 離散的フーリエ変換器
111 デランドマイザ
112,113,114 パラレルシリアル変換器
601 シフトレジスタ
602,603,604,605 16値QAM発生回路
701 シフトレジスタ
702,703,704,705 QPSK発生回路
Claims (6)
- 複数のサブキャリアを用いて通信を行い、かつ複数の通信チャンネルを送受信する直交周波数分割多重変復調回路であって、
前記複数のサブキャリアが複数の群に分割された各サブキャリア群を前記複数の通信チャンネルの各々に割り当てるようにし、前記各サブキャリア群に施される変調方式は、対応する通信チャンネルに必要とされるQoS(Quality of Service)に応じて変化させるようにし、
前記各サブキャリアの送信電力は、前記変調方式にかかわらず同一になるように、変調シンボルの波高値が決められている
ようにしたことを特徴とする直交周波数分割多重変復調回路。 - 複数のサブキャリアを用いて通信を行い、かつ複数の通信チャンネルを送受信する直交周波数分割多重変復調回路であって、
前記複数のサブキャリアが複数の群に分割された各サブキャリア群を前記複数の通信チャンネルの各々に割り当てるようにし、
前記各サブキャリアの周波数軸上の並び方をランダム化する手段を送信側に含み、
前記並び方がランダム化された信号を元に戻す手段を受信側に含み、
前記サブキャリアの位置をランダム化する処理は、シンボル毎に更新されるようにしたことを特徴とする直交周波数分割多重変復調回路。 - 前記シンボル毎のランダム化パターンを決定して前記受信側に伝達する手段を前記送信側に含み、前記ランダム化パターンの送受間の同期を取る手段を含むことを特徴とする請求項2記載の直交周波数分割多重変復調回路。
- 前記ランダム化パターンの送受間の同期を取る手段として、所定の通信チャンネル及びそれに対応するサブキャリアが割り当てられていることを特徴とする請求項3記載の直交周波数分割多重変復調回路。
- 前記所定の通信チャンネル及びそれに対応するサブキャリアは、前記ランダム化のプロセスから除外されていることを特徴とする請求項4記載の直交周波数分割多重変復調回路。
- 前記個々の通信チャンネルへのサブキャリア群の割り当てが前記通信チャンネルの少なくともビットレート及びQoS(Quality of Service)に応じて適応的に行われることを特徴とする請求項1−5のいずれか1つに記載の直交周波数分割多重変復調回路。
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JP2004240628A JP3786129B2 (ja) | 2004-08-20 | 2004-08-20 | 直交周波数分割多重変復調回路 |
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JP2004240628A JP3786129B2 (ja) | 2004-08-20 | 2004-08-20 | 直交周波数分割多重変復調回路 |
Related Parent Applications (1)
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JP2000177711A Division JP2001358692A (ja) | 2000-06-14 | 2000-06-14 | 直交周波数分割多重変復調回路 |
Publications (2)
Publication Number | Publication Date |
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JP2004350326A JP2004350326A (ja) | 2004-12-09 |
JP3786129B2 true JP3786129B2 (ja) | 2006-06-14 |
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JP2004240628A Expired - Lifetime JP3786129B2 (ja) | 2004-08-20 | 2004-08-20 | 直交周波数分割多重変復調回路 |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8155068B2 (en) | 2008-07-09 | 2012-04-10 | Fujitsu Limited | Base-station apparatus, mobile machine, communication system, and channel allocation method |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4614977B2 (ja) * | 2005-01-18 | 2011-01-19 | 富士通株式会社 | Ofdm−cdma通信システムにおける送信方法および送信装置 |
US7634016B2 (en) * | 2006-04-25 | 2009-12-15 | Microsoft Corporation | Variable OFDM subchannel coding and modulation |
US8189621B2 (en) | 2006-05-12 | 2012-05-29 | Microsoft Corporation | Stack signaling to application with lack of requested bandwidth |
US8144793B2 (en) | 2006-12-12 | 2012-03-27 | Microsoft Corporation | Cognitive multi-user OFDMA |
US7970085B2 (en) | 2007-05-08 | 2011-06-28 | Microsoft Corporation | OFDM transmission and reception for non-OFDMA signals |
US8374130B2 (en) | 2008-01-25 | 2013-02-12 | Microsoft Corporation | Orthogonal frequency division multiple access with carrier sense |
-
2004
- 2004-08-20 JP JP2004240628A patent/JP3786129B2/ja not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8155068B2 (en) | 2008-07-09 | 2012-04-10 | Fujitsu Limited | Base-station apparatus, mobile machine, communication system, and channel allocation method |
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JP2004350326A (ja) | 2004-12-09 |
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