JPH06507763A - コンステレーションがチャネル品質に応じて変更されるqamシステム - Google Patents
コンステレーションがチャネル品質に応じて変更されるqamシステムInfo
- Publication number
- JPH06507763A JPH06507763A JP4509872A JP50987292A JPH06507763A JP H06507763 A JPH06507763 A JP H06507763A JP 4509872 A JP4509872 A JP 4509872A JP 50987292 A JP50987292 A JP 50987292A JP H06507763 A JPH06507763 A JP H06507763A
- Authority
- JP
- Japan
- Prior art keywords
- wireless
- signal
- qam
- modulation
- bits
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/08—Arrangements for detecting or preventing errors in the information received by repeating transmission, e.g. Verdan system
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0025—Transmission of mode-switching indication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/20—Arrangements for detecting or preventing errors in the information received using signal quality detector
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
- H04L1/0019—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy in which mode-switching is based on a statistical approach
- H04L1/0021—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy in which mode-switching is based on a statistical approach in which the algorithm uses adaptive thresholds
Abstract
Description
Claims (12)
- 1.少なくとも1つが無線トランシーバを有する一対のステーションを具備する 無線システムであって、他のステーションからの信号を受信する無線受信機と、 受信した無線信号を評価する手段と、 受信信号の上記評価に基づいて送信変調状態を選択する手段と、 複数の変調状態を有する変調方法を用いて、信号を他のステーションに送信する 無線送信機と、 前記無線送信機の送信状態を選択された前記変調状態に調整する手段と、 前記他のステーションに送信される信号に前記選択された変調状態の表示を含め るための報知手段と、を具備する無線システム。
- 2.前記報知手段が、前記変調状態の所定の1つで前記選択された変調状態の表 示を送信すべく、前記無線送信機の変調状態を調整する手段を具備する特許請求 の範囲第1項に記載の無線システム。
- 3.前記無線システムが時分割二重動作を使用して動作する特許請求の範囲第1 又は2項に記載の無線システム。
- 4.前記トランシーバの前記変調方法がQAM(quadratureampl itude modulation)である特許請求の範囲第1、2又は3項に 記載の無線システム。
- 5.受信無線信号を評価する前記手段が、受信信号の強さとこれらの信号のビッ トエラーレートとの両方又は一方を評価する特許請求の範囲第1項乃至4項のい ずれかに記載の無線システム。
- 6.各ステーションが前記した特許請求の範囲のいずれかにおいて定義された無 線トランシーバを有する特許請求の範囲第1項乃至第5項のいずれかに記載の無 線システム。
- 7.送信すべく各シンボル上に符号化された2進デジットの数が、測定された受 信信号の強さ、測定されたビットエラーレート(BER)、あるいはこれらの組 み合わせに応じて可変されることを特徴とするデジタル信号送信のための無線ト ランシーバ。
- 8.受信信号の強さが所定の時間に渡って平均化されるとともに、次の送信に使 用されるビット/シンボルの数がこの平均値に応じて決定されることを特徴とす る無線トランシーバ。
- 9.受信復号化デジタル信号のエラーがエラー検出システムを使用して識別され 、次の送信に使用されるビット/シンボルの数が、検出されたエラーの数と分布 に基づいていることを特徴とする無線トランシーバ。
- 10.無線通信が双方向性あるいは瞬時的単方向性であり、データがパケット又 はブロックの形で配置され、各ブロックの初期シンボルがそのブロック内で使用 されるビット/シンボルの数を報知すべく保存される無線システム。
- 11.早いフェージングを有する無線チャネルを介して動作させるための移動体 無線システムであって、変調レベルの数が早いフェージングに等しいレートで可 変される移動体無線システム。
- 12.無線信号を受信する無線受信機と、受信した無線信号を評価する手段と、 受信信号の評価に基づいて送信変調状態を選択する手段と、複数の変調状態を有 する変調方法を使用して信号を送信する無線送信機と、 前記無線送信機の送信状態を前記選択された変調状態に調整する手段と、 送信される信号に前記選択された変調状態の表示を含める報知手段とを具備する 無線トランシーバ。
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB919111856A GB9111856D0 (en) | 1991-06-03 | 1991-06-03 | Variable rate qam for data transmission over mobile radio channels |
GB9111856.2 | 1991-06-03 | ||
GB919114556A GB9114556D0 (en) | 1991-07-05 | 1991-07-05 | Variable level qam |
GB9114556.5 | 1991-07-05 | ||
PCT/GB1992/000988 WO1992022162A1 (en) | 1991-06-03 | 1992-06-02 | Qam system in which the constellation is modified in accordance with channel quality |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH06507763A true JPH06507763A (ja) | 1994-09-01 |
JP3193378B2 JP3193378B2 (ja) | 2001-07-30 |
Family
ID=26298993
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP50987292A Expired - Lifetime JP3193378B2 (ja) | 1991-06-03 | 1992-06-02 | コンステレーションがチャネル品質に応じて変更されるqamシステム |
Country Status (12)
Country | Link |
---|---|
US (1) | US5828695A (ja) |
EP (1) | EP0587620B1 (ja) |
JP (1) | JP3193378B2 (ja) |
AT (1) | ATE162035T1 (ja) |
AU (1) | AU656972B2 (ja) |
CA (1) | CA2110578C (ja) |
DE (1) | DE69223961T2 (ja) |
DK (1) | DK0587620T3 (ja) |
ES (1) | ES2112318T3 (ja) |
HK (1) | HK1008162A1 (ja) |
SG (1) | SG47627A1 (ja) |
WO (1) | WO1992022162A1 (ja) |
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- 1992-06-02 DK DK92910845T patent/DK0587620T3/da active
- 1992-06-02 DE DE69223961T patent/DE69223961T2/de not_active Expired - Lifetime
- 1992-06-02 AT AT92910845T patent/ATE162035T1/de not_active IP Right Cessation
- 1992-06-02 AU AU17724/92A patent/AU656972B2/en not_active Ceased
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- 1992-06-02 SG SG1996003264A patent/SG47627A1/en unknown
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JP2003516693A (ja) * | 1999-12-10 | 2003-05-13 | ノキア コーポレーション | 空間−時間コードのためのビット対シンボルマッピングを提供する方法および装置 |
JP4713807B2 (ja) * | 1999-12-10 | 2011-06-29 | ノキア コーポレーション | 空間−時間コードのためのビット対シンボルマッピングを提供する方法および装置 |
US7095797B2 (en) | 2001-08-17 | 2006-08-22 | Matsushita Electric Industrial Co., Ltd. | Method of modulating a data signal with modulation switching between direct and differential modulation and apparatus for modulation |
US7333566B2 (en) | 2002-07-19 | 2008-02-19 | Sanyo Electric Co., Ltd | Radio reception apparatus, radio reception method and radio reception program capable of switching modulation methods |
WO2004047393A1 (ja) * | 2002-11-19 | 2004-06-03 | Fujitsu Access Limited | 利得差多重を用いた多重qam変調装置、多重qam復調装置、および通信方法 |
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Publication number | Publication date |
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JP3193378B2 (ja) | 2001-07-30 |
WO1992022162A1 (en) | 1992-12-10 |
ES2112318T3 (es) | 1998-04-01 |
EP0587620B1 (en) | 1998-01-07 |
AU656972B2 (en) | 1995-02-23 |
US5828695A (en) | 1998-10-27 |
EP0587620A1 (en) | 1994-03-23 |
ATE162035T1 (de) | 1998-01-15 |
CA2110578C (en) | 1999-04-27 |
HK1008162A1 (en) | 1999-04-30 |
AU1772492A (en) | 1993-01-08 |
SG47627A1 (en) | 1998-04-17 |
DE69223961T2 (de) | 1998-07-30 |
DE69223961D1 (de) | 1998-02-12 |
CA2110578A1 (en) | 1992-12-10 |
DK0587620T3 (da) | 1998-09-07 |
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