MX9701907A - Aparato de compensacion ciego. - Google Patents
Aparato de compensacion ciego.Info
- Publication number
- MX9701907A MX9701907A MX9701907A MX9701907A MX9701907A MX 9701907 A MX9701907 A MX 9701907A MX 9701907 A MX9701907 A MX 9701907A MX 9701907 A MX9701907 A MX 9701907A MX 9701907 A MX9701907 A MX 9701907A
- Authority
- MX
- Mexico
- Prior art keywords
- values
- memory means
- information symbols
- controller
- sample values
- Prior art date
Links
Classifications
-
- 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
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03178—Arrangements involving sequence estimation techniques
- H04L25/03203—Trellis search techniques
Abstract
Se da a conocer un demodulador para demodular una señal modulada con símbolos de informacion digitales a fin de extraer los símbolos de informacion. Un receptor recibe una señal a través de un canal de comunicaciones y las muestras extraídas y digitizadores producen una secuencia de valores de muestra numéricos representativos de la señal recibida. Se proporcionan memorias cada una teniendo un numero de memorias de estado cada una asociada con una asociada con una sarta de símbolos hipotesizados. Un controlador recupera selectivamente los valores del medio de memoria y controla la sincronizacion de las operaciones en el mismo. Una computadora métrica calcula las métricas candidatas usando una hipotesis de un siguiente símbolo de los símbolos de informacion que van a demodularse producidos por el controlador, uno de los valores de muestra numéricos, los valores métricos de trayectoria, las matrices B y los vectores U y las métricas candidatas asociadas con el numero seleccionado por el controlador desde el medio de memoria. Una computadora predecesora optima determina la mejor de las métricas candidatas que va a seleccionarse para escribirse de nuevo en el medio de memoria junto con la matriz B sucesora, el vector U y la historia de la trayectoria. Las matrices B sucesoras, los vectores U y la historia de la trayectoria luego se actualizan usando valores correspondientes asociados con el procesador optimo y uno de los valores de la muestra numérica.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/305,727 US5557645A (en) | 1994-09-14 | 1994-09-14 | Channel-independent equalizer device |
US08305727 | 1994-09-14 | ||
PCT/US1995/011708 WO1996008903A1 (en) | 1994-09-14 | 1995-09-12 | Blind equalizing apparatus |
Publications (2)
Publication Number | Publication Date |
---|---|
MXPA97001907A MXPA97001907A (es) | 1997-06-01 |
MX9701907A true MX9701907A (es) | 1997-06-28 |
Family
ID=23182074
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
MX9701907A MX9701907A (es) | 1994-09-14 | 1995-09-12 | Aparato de compensacion ciego. |
Country Status (8)
Country | Link |
---|---|
US (2) | US5557645A (es) |
EP (1) | EP0781481B1 (es) |
JP (1) | JPH10505978A (es) |
AU (1) | AU688974B2 (es) |
DE (1) | DE69535903D1 (es) |
FI (1) | FI971054A (es) |
MX (1) | MX9701907A (es) |
WO (1) | WO1996008903A1 (es) |
Families Citing this family (31)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5943324A (en) * | 1994-01-11 | 1999-08-24 | Ericsson, Inc. | Methods and apparatus for mobile station to mobile station communications in a mobile satellite communication system |
US5805638A (en) * | 1995-12-04 | 1998-09-08 | Lucent Technologies Inc. | Systems and methods of digital wireless communication using equalization |
US5802112A (en) * | 1996-01-16 | 1998-09-01 | Transcendat Inc. | Multi-level, multi-frequency interference pattern analog waveform encoding of digital data for transmission |
US5793807A (en) * | 1996-05-07 | 1998-08-11 | Lucent Technologies Inc. | Multimodulus blind eqalization using piecewise linear contours |
US6185259B1 (en) | 1996-06-12 | 2001-02-06 | Ericsson Inc. | Transmitter/receiver for GMSK and offset-QAM |
US6320914B1 (en) * | 1996-12-18 | 2001-11-20 | Ericsson Inc. | Spectrally efficient modulation using overlapped GMSK |
US6215762B1 (en) | 1997-07-22 | 2001-04-10 | Ericsson Inc. | Communication system and method with orthogonal block encoding |
US6185258B1 (en) | 1997-09-16 | 2001-02-06 | At&T Wireless Services Inc. | Transmitter diversity technique for wireless communications |
US5887035A (en) * | 1997-10-31 | 1999-03-23 | Ericsson, Inc. | Method for joint equalization and detection of multiple user signals |
EP0960487B1 (en) * | 1997-10-31 | 2006-03-08 | AT&T Wireless Services, Inc. | Maximum likelihood detection of concatenated space-time codes for wireless applications with transmitter diversity |
US6049574A (en) * | 1998-04-17 | 2000-04-11 | Trustees Of Tufts College | Blind adaptive equalization using cost function that measures dissimilarity between the probability distributions of source and equalized signals |
US6038262A (en) * | 1998-06-09 | 2000-03-14 | Transcendata, Inc. | Method and apparatus for compensation of electro-magnetic distortion using weighted feedback delay for amplitude coded sinusoidal waveform generation and transmission |
AT407933B (de) * | 1998-06-09 | 2001-07-25 | Juha Dipl Ing Laurila | Verfahren zur trennung und zur detektion von gleichkanal-signalen |
US6567475B1 (en) | 1998-12-29 | 2003-05-20 | Ericsson Inc. | Method and system for the transmission, reception and processing of 4-level and 8-level signaling symbols |
US6507602B1 (en) | 1999-01-07 | 2003-01-14 | Ericsson, Inc. | Smoothing receiver channel estimates using spectral estimation |
US6347125B1 (en) | 1999-01-11 | 2002-02-12 | Ericsson Inc. | Reduced complexity demodulator for multi-bit symbols |
US6556634B1 (en) * | 1999-02-10 | 2003-04-29 | Ericsson, Inc. | Maximum likelihood rake receiver for use in a code division, multiple access wireless communication system |
US6304216B1 (en) | 1999-03-30 | 2001-10-16 | Conexant Systems, Inc. | Signal detector employing correlation analysis of non-uniform and disjoint sample segments |
US6463099B1 (en) * | 1999-05-18 | 2002-10-08 | The Hong Kong University Of Science And Technology | Blind channel equalizers and methods of blind channel equalization |
KR100636512B1 (ko) * | 1999-08-31 | 2006-10-18 | 엘지전자 주식회사 | 비터비 복호기의 가지 메트릭 장치 |
US6570910B1 (en) * | 1999-10-25 | 2003-05-27 | Ericsson Inc. | Baseband processor with look-ahead parameter estimation capabilities |
US6484285B1 (en) | 2000-02-07 | 2002-11-19 | Ericsson, Inc. | Tailbiting decoder and method |
US6625236B1 (en) | 2000-02-08 | 2003-09-23 | Ericsson Inc. | Methods and systems for decoding symbols by combining matched-filtered samples with hard symbol decisions |
US7079586B1 (en) * | 2000-03-16 | 2006-07-18 | Koninklijke Philips Electronics N.V. | Systems and methods for optimal distribution of symbols in a fixed size data packet to improve receiver performance |
US7443826B1 (en) | 2000-10-04 | 2008-10-28 | Telefonaktiebolaget L M Ericsson (Publ) | Method and apparatus for automatic frequency control in a CDMA receiver |
US7440489B2 (en) * | 2001-08-07 | 2008-10-21 | Ericsson Inc. | Method and apparatus for selective demodulation and decoding of communications signals |
EP1442570B1 (de) * | 2001-11-09 | 2005-05-04 | Infineon Technologies AG | Viterbi-entzerrung unter verwendung eines tabellenspeichers zur bereithaltung von rekonstruierten signalwerten für die berechnung von übergangsmetriken |
AU2003213579B2 (en) * | 2002-03-04 | 2008-11-13 | Glowlink Communications Technology | Detecting and measuring interference contained within a digital carrier |
GB2395871B (en) * | 2002-11-28 | 2006-01-11 | Toshiba Res Europ Ltd | Signal estimation methods and apparatus |
JP4812454B2 (ja) * | 2006-02-13 | 2011-11-09 | ソニー株式会社 | 復調装置および方法、並びにプログラム |
US20090086806A1 (en) * | 2007-09-27 | 2009-04-02 | Nanoamp Solutions Inc. (Cayman) | Time varying equalization |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3911999A1 (de) * | 1989-04-12 | 1990-10-18 | Philips Patentverwaltung | Uebertragungssystem |
JP2960436B2 (ja) * | 1989-06-26 | 1999-10-06 | 株式会社日立製作所 | 非線形データ伝送システム用受信器 |
SE464902B (sv) * | 1989-10-24 | 1991-06-24 | Ericsson Telefon Ab L M | Foerfarande att adaptera en viterbialgoritm till en kanal med skiftande oeverfoeringsegenskaper samt en anordning foer genomfoerande av foerfarandet |
DE4001592A1 (de) * | 1989-10-25 | 1991-05-02 | Philips Patentverwaltung | Empfaenger fuer digitales uebertragungssystem |
US5263033A (en) * | 1990-06-22 | 1993-11-16 | At&T Bell Laboratories | Joint data and channel estimation using fast blind trellis search |
DE4038251A1 (de) * | 1990-11-30 | 1992-06-04 | Philips Patentverwaltung | Entzerrer fuer ein digitales uebertragungssystem |
US5331666A (en) * | 1992-06-08 | 1994-07-19 | Ericsson Ge Mobile Communications Inc. | Adaptive maximum likelihood demodulator |
US5335250A (en) * | 1992-10-22 | 1994-08-02 | Ericsson Ge Mobile Communications Inc. | Method and apparatus for bidirectional demodulation of digitally modulated signals |
US5347541A (en) * | 1992-11-02 | 1994-09-13 | The Regents Of The Univ. Of California | Apparatus and method for utilizing a blind equalizer based on a Bayesian symbol sequence estimator for use in digital communication |
-
1994
- 1994-09-14 US US08/305,727 patent/US5557645A/en not_active Expired - Lifetime
-
1995
- 1995-09-12 EP EP95933114A patent/EP0781481B1/en not_active Expired - Lifetime
- 1995-09-12 DE DE69535903T patent/DE69535903D1/de not_active Expired - Fee Related
- 1995-09-12 WO PCT/US1995/011708 patent/WO1996008903A1/en active IP Right Grant
- 1995-09-12 JP JP8510354A patent/JPH10505978A/ja not_active Withdrawn
- 1995-09-12 MX MX9701907A patent/MX9701907A/es unknown
- 1995-09-12 AU AU35893/95A patent/AU688974B2/en not_active Ceased
-
1996
- 1996-06-03 US US08/657,345 patent/US5619533A/en not_active Expired - Lifetime
-
1997
- 1997-03-13 FI FI971054A patent/FI971054A/fi unknown
Also Published As
Publication number | Publication date |
---|---|
WO1996008903A1 (en) | 1996-03-21 |
AU3589395A (en) | 1996-03-29 |
AU688974B2 (en) | 1998-03-19 |
US5557645A (en) | 1996-09-17 |
JPH10505978A (ja) | 1998-06-09 |
EP0781481A1 (en) | 1997-07-02 |
US5619533A (en) | 1997-04-08 |
EP0781481B1 (en) | 2009-01-07 |
DE69535903D1 (de) | 2009-02-26 |
FI971054A0 (fi) | 1997-03-13 |
FI971054A (fi) | 1997-05-14 |
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