ES2196221T3 - Circuito para deshacer la correlacion de qam. - Google Patents
Circuito para deshacer la correlacion de qam.Info
- Publication number
- ES2196221T3 ES2196221T3 ES97113520T ES97113520T ES2196221T3 ES 2196221 T3 ES2196221 T3 ES 2196221T3 ES 97113520 T ES97113520 T ES 97113520T ES 97113520 T ES97113520 T ES 97113520T ES 2196221 T3 ES2196221 T3 ES 2196221T3
- Authority
- ES
- Spain
- Prior art keywords
- component
- circuit
- quadrant
- bli
- phase
- 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.)
- Expired - Lifetime
Links
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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/06—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection
- H04L25/061—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection providing hard decisions only; arrangements for tracking or suppressing unwanted low frequency components, e.g. removal of dc offset
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Power Engineering (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
SEGUN LA INVENCION, LA INFORMACION PROCEDENTE DE UN DECODIFICADOR DIFERENCIAL (1) QUE RECIBE LA BLP (BANDA LATERAL PRINCIPAL) DE LA COMPONENTE EN FASE Y LA BLP DE LA COMPONENTE EN CUADRATURA SE USA PARA CAMBIAR EL SENTIDO DE GIRO DE LA BANDA LATERAL INFERIOR (BLI) DE LA COMPONENTE EN FASE Y LA BLI DE LA COMPONENTE DE CUADRATURA EN EL PRIMER CUADRANTE, CON UN ROTADOR (2). A CONTINUACION, UN UNICO CUADRANTE ES DESENCUADRADO POR UN SOLO DESENCUADRADOR DE CUADRANTE (3). DE ESE MODO, SE REDUCE CONSIDERABLEMENTE LA TABLA DE BUSQUEDA NECESARIA PARA EL CIRCUITO DE DESENCUADRE. LA SEÑAL DE SALIDA DEL CIRCUITO DE DESENCUADRE DEL MAC SE CONSTRUYE A PARTIR DE LAS BLI DESENCUADRADAS DE LA SALIDA DE LAS COMPONENTES EN FASE Y EN CUADRATURA POR EL UNICO DESENCUADRADOR DE CUADRANTE (3) Y LAS SALIDAS DEL DECODIFICADOR DIFERENCIAL (1).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP97113520A EP0896458B1 (en) | 1997-08-05 | 1997-08-05 | QAM de-mapping circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
ES2196221T3 true ES2196221T3 (es) | 2003-12-16 |
Family
ID=8227174
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ES97113520T Expired - Lifetime ES2196221T3 (es) | 1997-08-05 | 1997-08-05 | Circuito para deshacer la correlacion de qam. |
Country Status (6)
Country | Link |
---|---|
US (1) | US6226333B1 (es) |
EP (1) | EP0896458B1 (es) |
JP (1) | JP3822982B2 (es) |
KR (1) | KR100596344B1 (es) |
DE (1) | DE69720712T2 (es) |
ES (1) | ES2196221T3 (es) |
Families Citing this family (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7376206B1 (en) | 2000-11-06 | 2008-05-20 | Qualcomm Incorporated | Method and apparatus for adjusting the phase of a received signal |
JP2003087212A (ja) * | 2001-09-11 | 2003-03-20 | Clarion Co Ltd | Ofdm受信機の逆マッピング回路 |
KR100464325B1 (ko) | 2001-10-15 | 2005-01-03 | 삼성전자주식회사 | 이동통신시스템에서 패킷 재전송을 위한 송수신 장치 및 방법 |
US7430252B2 (en) * | 2002-09-10 | 2008-09-30 | Intel Corporation | Apparatus and method for WGIO phase modulation |
KR20050061142A (ko) * | 2003-12-18 | 2005-06-22 | 삼성전자주식회사 | Ofdma 기반 패킷 통신 시스템에서 적응형 변조 및코딩 방식을 효율적으로 구현하는 복조 장치 및 그 방법 |
US7242729B1 (en) * | 2004-04-26 | 2007-07-10 | Dgi Creations, Llc | Signal decoding method and apparatus |
US7609784B1 (en) | 2004-04-26 | 2009-10-27 | Dgi Creations, Llc | Signal decoding method and apparatus with dynamic noise threshold |
DE102004025826A1 (de) | 2004-05-24 | 2005-12-22 | Micronas Gmbh | Verfahren zur Rückbildung einer Bitsequenz aus QPSK- oder QAM-Symbolen |
US8724744B2 (en) * | 2005-08-19 | 2014-05-13 | General Instrument Corporation | Method and apparatus for wide dynamic range reduction |
TWI309118B (en) * | 2005-11-15 | 2009-04-21 | Realtek Semiconductor Corp | Demapper applied to quadrature amplitude modulation trellis coded modulation decoder and related method |
JP4655232B2 (ja) * | 2007-04-27 | 2011-03-23 | ソニー株式会社 | 復調装置および方法 |
WO2010004755A1 (ja) * | 2008-07-09 | 2010-01-14 | 株式会社アドバンテスト | 試験装置、及び試験方法 |
TW201025954A (en) * | 2008-12-25 | 2010-07-01 | Sunplus Technology Co Ltd | Transmission parameter signaling decoder (TPS decoder) applicable to DVB-T digital TV system and the receiving system using the same |
MX2013001081A (es) | 2010-07-27 | 2013-08-21 | Kil Bong Song | Motor de armadura segmentada. |
CN104737510B (zh) * | 2012-12-14 | 2018-02-13 | 三菱电机株式会社 | Qam调制通信系统的多级差分解码装置和方法 |
WO2015137049A1 (ja) * | 2014-03-13 | 2015-09-17 | 三菱電機株式会社 | 尤度生成装置およびその方法 |
JP6103610B2 (ja) * | 2015-11-17 | 2017-03-29 | 日本電信電話株式会社 | Qamマッピング装置およびマッピング方法 |
US10216575B2 (en) * | 2016-03-17 | 2019-02-26 | Sandisk Technologies Llc | Data coding |
US11588522B2 (en) * | 2016-04-08 | 2023-02-21 | Qualcomm Incorporated | Techniques for sparse code multiple access (SCMA) codebook design |
KR102100172B1 (ko) | 2019-03-26 | 2020-04-13 | 김형철 | 모터의 냉각 구조 |
KR102100169B1 (ko) | 2019-03-26 | 2020-04-13 | 김형철 | 양방향 모터의 냉각 구조 |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4247944A (en) * | 1978-11-15 | 1981-01-27 | Ricoh Co., Ltd. | V.29 Constellation detection method and apparatus |
US4574244A (en) * | 1984-06-22 | 1986-03-04 | Rockwell International Corporation | QAM Demodulator automatic quadrature loop using n-m LSB's |
US4709377A (en) * | 1985-03-13 | 1987-11-24 | Paradyne | Viterbi decoder for wireline modems |
US4646325A (en) * | 1985-04-15 | 1987-02-24 | Paradyne Corporation | Index decoder for digital modems |
AU630417B2 (en) * | 1989-02-16 | 1992-10-29 | Codex Corporation | Trellis shaping for modulation systems |
US5214672A (en) * | 1990-04-06 | 1993-05-25 | Codex Corporation | Trellis precoding for fractional bits/baud |
GB9016420D0 (en) * | 1990-07-26 | 1990-09-12 | British Telecomm | Block coded modulation |
US5253271A (en) * | 1991-02-15 | 1993-10-12 | Schlumberger Technology Corporation | Method and apparatus for quadrature amplitude modulation of digital data using a finite state machine |
US5838727A (en) * | 1991-02-15 | 1998-11-17 | Schlumberger Technology Corporation | Method and apparatus for transmitting and receiving digital data over a bandpass channel |
US5384810A (en) * | 1992-02-05 | 1995-01-24 | At&T Bell Laboratories | Modulo decoder |
US5329551A (en) * | 1992-04-16 | 1994-07-12 | At&T Bell Laboratories | Overlapped multilevel codes |
US5315617A (en) * | 1992-05-29 | 1994-05-24 | General Electric Company | QAM encoding for high-definition television system |
US5548615A (en) * | 1993-05-03 | 1996-08-20 | At&T Corp. | Methods and apparatus for rotationally invariant multilevel coding |
EP0737394A1 (en) * | 1994-10-21 | 1996-10-16 | Koninklijke Philips Electronics N.V. | A qam constellation which is robust in the presence of phase noise; encoder and decoder for this constellation |
JPH08130564A (ja) * | 1994-11-02 | 1996-05-21 | Fujitsu Ltd | アイパターン表示方法、通信装置および表示装置 |
US5878085A (en) * | 1997-08-15 | 1999-03-02 | Sicom, Inc. | Trellis coded modulation communications using pilot bits to resolve phase ambiguities |
-
1997
- 1997-08-05 DE DE69720712T patent/DE69720712T2/de not_active Expired - Lifetime
- 1997-08-05 ES ES97113520T patent/ES2196221T3/es not_active Expired - Lifetime
- 1997-08-05 EP EP97113520A patent/EP0896458B1/en not_active Expired - Lifetime
-
1998
- 1998-08-03 US US09/128,293 patent/US6226333B1/en not_active Expired - Lifetime
- 1998-08-05 JP JP22218398A patent/JP3822982B2/ja not_active Expired - Fee Related
- 1998-08-05 KR KR1019980031829A patent/KR100596344B1/ko not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
EP0896458A1 (en) | 1999-02-10 |
DE69720712T2 (de) | 2004-02-26 |
US6226333B1 (en) | 2001-05-01 |
KR19990023364A (ko) | 1999-03-25 |
DE69720712D1 (de) | 2003-05-15 |
JP3822982B2 (ja) | 2006-09-20 |
EP0896458B1 (en) | 2003-04-09 |
JPH11146027A (ja) | 1999-05-28 |
KR100596344B1 (ko) | 2007-05-04 |
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