JP4603536B2 - 階層変調システムにおける復調のための装置および方法 - Google Patents
階層変調システムにおける復調のための装置および方法 Download PDFInfo
- Publication number
- JP4603536B2 JP4603536B2 JP2006514254A JP2006514254A JP4603536B2 JP 4603536 B2 JP4603536 B2 JP 4603536B2 JP 2006514254 A JP2006514254 A JP 2006514254A JP 2006514254 A JP2006514254 A JP 2006514254A JP 4603536 B2 JP4603536 B2 JP 4603536B2
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- Prior art keywords
- signal
- hierarchical modulation
- receiver
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- space
- 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.)
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/38—Demodulator circuits; Receiver circuits
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18517—Transmission equipment in earth stations
-
- 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
- H04L1/0016—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy involving special memory structures, e.g. look-up tables
-
- 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
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0045—Arrangements at the receiver end
- H04L1/0047—Decoding adapted to other signal detection operation
- H04L1/005—Iterative decoding, including iteration between signal detection and decoding operation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L27/22—Demodulator circuits; Receiver circuits
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/36—Modulator circuits; Transmitter circuits
- H04L27/366—Arrangements for compensating undesirable properties of the transmission path between the modulator and the demodulator
Description
z=IREC+jQREC (1)
である。
LLR(i,z)=log[prob(bi=1|z)/prob(bi=0|z)] (2)
となる。ここでbiはi番目のビットで、zは信号空間中での受信信号点である。prob(bi=1|z)の記号は、信号点zが受信されたときにi番目のビットが1である確率を表している。同様に、prob(bi=0|z)の記号は、信号点zが受信されたときにi番目のビットが0である確率を表している。
ln[(b0が1の確率)/(b0が0の確率)] (5A)
すなわち、
ln[(シンボル01または11の確率)/(シンボル00または10の確率)] (5B)
すなわち、
ln[{exp(−d4 2/2σ2)+exp(−d3 2/2σ2)}/{exp(−d2 2/2σ2)+exp(−d1 2/2σ2)}] (5C)
となり、一方、LLR(b1)は:
ln[(b1が1の確率)/(b1が0の確率)] (6A)
すなわち、
ln[(シンボル10または11の確率)/(シンボル00または01の確率)] (6B)
すなわち、
ln[{exp(−d1 2/2σ2)+exp(−d3 2/2σ2)}/{exp(−d2 2/2σ2)+exp(−d4 2/2σ2)}] (6C)
となる。
Claims (5)
- 少なくとも第一の信号層および第二の信号層を有する階層変調に基づき、少なくとも前記第一および第二の信号層についての合成信号空間において表される信号を受信するステップと、
受信した階層変調に基づく信号から前記第一の信号層で伝送されたデータおよび前記第二の信号層で伝送されたデータを同時的に復元するステップとを含み、
ここで、前記同時的復元ステップが:
前記階層変調に基づく信号を復号して前記第一の信号層で伝送されたデータを復元するステップと、
前記合成信号空間において表される前記階層変調に基づく信号からメトリックを生成するステップと、
前記階層変調に基づく信号を復号して前記生成されたメトリックの関数として前記第二の信号層で伝送されたデータを復元するステップとを含む、
ことを特徴とする、受信機で使用するための方法。 - 前記第一の信号層が上信号層であり、前記第二の信号層が下信号層であることを特徴とする、請求項1記載の方法。
- 前記メトリックが対数尤度比であることを特徴とする、請求項1記載の方法。
- 前記合成信号空間が前記第一の信号層の信号空間および前記第二の信号層の信号空間を組み合わせたものであることを特徴とする、請求項1記載の方法。
- 前記生成するステップが前記階層変調に基づく信号をメトリックの探索表へのインデックスとして使うステップを含むことを特徴とする、請求項1記載の方法。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US46794603P | 2003-05-05 | 2003-05-05 | |
PCT/US2004/013735 WO2004100478A2 (en) | 2003-05-05 | 2004-04-24 | Apparatus and method for decoding in a hierarchical modulation system |
Publications (3)
Publication Number | Publication Date |
---|---|
JP2006525767A JP2006525767A (ja) | 2006-11-09 |
JP2006525767A5 JP2006525767A5 (ja) | 2007-06-14 |
JP4603536B2 true JP4603536B2 (ja) | 2010-12-22 |
Family
ID=33435146
Family Applications (3)
Application Number | Title | Priority Date | Filing Date |
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JP2006514254A Expired - Fee Related JP4603536B2 (ja) | 2003-05-05 | 2004-04-24 | 階層変調システムにおける復調のための装置および方法 |
JP2006514253A Expired - Fee Related JP4642753B2 (ja) | 2003-05-05 | 2004-04-24 | インタラクティブ復号化に利用される装置及び方法 |
JP2006514226A Expired - Fee Related JP4516959B2 (ja) | 2003-05-05 | 2004-04-30 | マルチレベル変調信号を同期させる方法及び装置 |
Family Applications After (2)
Application Number | Title | Priority Date | Filing Date |
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JP2006514253A Expired - Fee Related JP4642753B2 (ja) | 2003-05-05 | 2004-04-24 | インタラクティブ復号化に利用される装置及び方法 |
JP2006514226A Expired - Fee Related JP4516959B2 (ja) | 2003-05-05 | 2004-04-30 | マルチレベル変調信号を同期させる方法及び装置 |
Country Status (8)
Country | Link |
---|---|
US (1) | US7464318B2 (ja) |
EP (3) | EP1620987A2 (ja) |
JP (3) | JP4603536B2 (ja) |
KR (3) | KR20060010780A (ja) |
CN (3) | CN100512244C (ja) |
BR (3) | BRPI0410010A (ja) |
DE (1) | DE602004016312D1 (ja) |
WO (3) | WO2004100475A2 (ja) |
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US7499696B2 (en) | 2003-11-26 | 2009-03-03 | Delphi Technologies, Inc. | Method to optimize hierarchical modulation for a diversity system |
US7230998B2 (en) | 2003-11-26 | 2007-06-12 | Delphi Technologies, Inc. | Method to increase performance of secondary data in a hierarchical modulation scheme |
US20050113040A1 (en) | 2003-11-26 | 2005-05-26 | Walker Glenn A. | Method to minimize compatibility error in hierarchical modulation using variable phase |
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US7386056B2 (en) | 2003-11-26 | 2008-06-10 | Delphi Technologies, Inc. | Method to increase performance of secondary data in a hierarchical modulation scheme |
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2004
- 2004-04-24 BR BRPI0410010-7A patent/BRPI0410010A/pt not_active IP Right Cessation
- 2004-04-24 JP JP2006514254A patent/JP4603536B2/ja not_active Expired - Fee Related
- 2004-04-24 EP EP04751224A patent/EP1620987A2/en not_active Ceased
- 2004-04-24 DE DE602004016312T patent/DE602004016312D1/de not_active Expired - Lifetime
- 2004-04-24 JP JP2006514253A patent/JP4642753B2/ja not_active Expired - Fee Related
- 2004-04-24 CN CNB2004800121585A patent/CN100512244C/zh not_active Expired - Fee Related
- 2004-04-24 BR BRPI0410036-0A patent/BRPI0410036A/pt not_active IP Right Cessation
- 2004-04-24 KR KR1020057020943A patent/KR20060010780A/ko not_active Application Discontinuation
- 2004-04-24 US US10/554,580 patent/US7464318B2/en active Active
- 2004-04-24 WO PCT/US2004/013733 patent/WO2004100475A2/en active Application Filing
- 2004-04-24 KR KR1020057021037A patent/KR101051213B1/ko not_active IP Right Cessation
- 2004-04-24 WO PCT/US2004/013735 patent/WO2004100478A2/en active Application Filing
- 2004-04-24 EP EP04751222A patent/EP1620984B1/en not_active Expired - Lifetime
- 2004-04-24 CN CNA200480012039XA patent/CN1784878A/zh active Pending
- 2004-04-30 BR BRPI0410013-1A patent/BRPI0410013A/pt not_active IP Right Cessation
- 2004-04-30 WO PCT/US2004/013647 patent/WO2004100479A1/en active Application Filing
- 2004-04-30 JP JP2006514226A patent/JP4516959B2/ja not_active Expired - Fee Related
- 2004-04-30 EP EP04751170A patent/EP1620986A1/en not_active Withdrawn
- 2004-04-30 CN CN2004800123241A patent/CN1784877B/zh not_active Expired - Fee Related
- 2004-04-30 KR KR1020057020978A patent/KR20060010781A/ko not_active Application Discontinuation
Also Published As
Publication number | Publication date |
---|---|
CN1784877A (zh) | 2006-06-07 |
WO2004100475A2 (en) | 2004-11-18 |
JP2006527532A (ja) | 2006-11-30 |
JP2006525767A (ja) | 2006-11-09 |
WO2004100479A1 (en) | 2004-11-18 |
KR101051213B1 (ko) | 2011-07-21 |
WO2004100478A3 (en) | 2005-05-19 |
EP1620986A1 (en) | 2006-02-01 |
EP1620984A2 (en) | 2006-02-01 |
CN100512244C (zh) | 2009-07-08 |
EP1620984B1 (en) | 2008-09-03 |
CN1784878A (zh) | 2006-06-07 |
US20060212776A1 (en) | 2006-09-21 |
KR20060010781A (ko) | 2006-02-02 |
JP4516959B2 (ja) | 2010-08-04 |
WO2004100478B1 (en) | 2005-07-14 |
WO2004100478A2 (en) | 2004-11-18 |
CN1784875A (zh) | 2006-06-07 |
CN1784877B (zh) | 2012-09-26 |
KR20060054179A (ko) | 2006-05-22 |
BRPI0410010A (pt) | 2006-04-25 |
WO2004100475A3 (en) | 2005-01-13 |
JP4642753B2 (ja) | 2011-03-02 |
BRPI0410013A (pt) | 2006-04-25 |
US7464318B2 (en) | 2008-12-09 |
JP2006525763A (ja) | 2006-11-09 |
EP1620987A2 (en) | 2006-02-01 |
KR20060010780A (ko) | 2006-02-02 |
DE602004016312D1 (de) | 2008-10-16 |
BRPI0410036A (pt) | 2006-04-25 |
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