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21. 发明专利

AU2442301A Correction of a sampling frequency offset in an orthogonal frequency division multiplexing system 未知
公开(公告)号：AU2442301A
公开(公告)日：2001-07-03
申请号：AU2442301
申请日：2000-12-20
申请人： THOMSON LICENSING SA
发明人： BELOTSERKOVSKY MAXIM B , LITWIN LOUIS ROBERT JR
IPC分类号： H04J11/00 , H04L7/00 , H04L27/26
摘要： An OFDM (orthogonal frequency division multiplexing) receiver that detects and corrects a sampling frequency offset of a sampled signal. The OFDM receiver samples an incoming signal in the time domain, multiplies the sampled data by a window function to widen the main lobe of each of the predetermined subcarriers' frequency domain spectrum, takes an FFT (fast Fourier transform) of the sampled signal to analyze the frequency domain samples of each predetermined subcarrier, detects a difference in magnitude of the frequency domain samples for each predetermined subcarrier, and generates a sampling frequency error based on the detected changes in magnitude.

22. 发明专利

MY134591A DUAL CHIEN SEARCH BLOCKS IN AN ERROR-CORRECTING DECODER 未知
公开(公告)号：MY134591A
公开(公告)日：2007-12-31
申请号：MYPI20030215
申请日：2003-01-22
申请人： THOMSON LICENSING SA
发明人： LITWIN LOUIS ROBERT JR , VELEZ DIDIER
IPC分类号： G06F11/10 , G11B20/18 , H03M13/15 , H04L1/00
摘要： A DECODER AND DECODING METHOD ARE DESCRIBED, IN WHICH A SYNDROME IS CALCULATED FROM A CODEWORD IN A SYNDROME GENERATOR (410) , AN ERROR POLYNOMIAL IS GENERATED BASED UPON THE SYNDROME IN AN ERROR POLYNOMIAL GENERATOR (420), AN ERROR LOCATION IS DETERMINED FROM THE ERROR POLYNOMIAL IN THE ERROR LOCATION GENERATOR (430), AN ERROR MAGNITUDE IS CALCULATED FROM THE ERROR POLYNOMIAL IN THE ERROR MAGNITUDE GENERATOR (440) AND THE CODEWORD IS CORRECTED BY A ERROR CORRECTED CODEWORD GENERATOR (450) RESPONSIVE TO LOCATION AND ERROR MAGNITUDE. AN INTRA-DECODER BLOCK MESSAGING SCHEME IS DESCRIBED IN WHICH ONE OR MORE COMPONENTS (410,420,430,440,450) GENERATE INACTIVITY MESSAGES (640,650) TO SIGNAL AN ABILITY TO PROCESS DATA CORRESPONDING TO A NEXT CODEWORD. A DUAL CHIEN SEARCH BLOCK (930, 940) IMPLEMENTATION IS DESCRIBED IN WHICH CHIEN BLOCK (930) IS USED TO DETERMINED THE NUMBER OF ERRORS CORRESPONDING TO A SPECIFIED CODEWORD, SEPARATELY FROM ERROR LOCATION AND MAGNITUDE CALCULATIONS PERFORMED BY THE CHIEN/FORNEY BLOCK (940). AN ENHANCED CHEIN SEARCH CELL ARCHITECTURE IS DESCRIBED WHICH UTILIZES AN ADDITIONAL GALOIS FIELD ADDER (1140) TO SYNCHRONIZE THE CODEWORD AND ERROR VECTOR, THEREBY DECREASING DELAY AND EXPENSE CORRESPONDING TO AN ERROR CORRECTING BLOCK (950) IMPLEMENTED WITH A LIFO REGISTER (952)

23. 发明专利

MY132105A INTRA-DECODER COMPONENT BLOCK MESSAGING 未知
公开(公告)号：MY132105A
公开(公告)日：2007-09-28
申请号：MYPI20030217
申请日：2003-01-22
申请人： THOMSON LICENSING SA
发明人： LITWIN LOUIS ROBERT JR , VELEZ DIDIER
IPC分类号： G06F11/10 , H03M13/00 , G11B20/18 , H03M13/15 , H03M13/29 , H04L1/00
摘要： A DECODER AND DECODING METHOD ARE DESCRIBED IN WHICH A SYNDROME IS CALCULATED FROM A CODEWORD IN A SYNDROME GENERATOR (410), AN ERROR POLYNOMIAL IS GENERATED BASED UPON THE SYNDROME IN AN ERROR POLYNOMIAL GENERATOR (420), AN ERROR LOCATION IS DETERMINED FROM THE ARROR POLYNOMIAL IN THE ERROR LOCATION GENERATOR (430), AN ERROR MAGNITUDE IS CALCULATED FROM THE ERROR POLYNOMIAL IN THE ARROR MAGNITUDE GENERATOR (440) AND THE CODEWORD IS CORRECTED BY A ERROR CORRECTED CODEWORD GENERATOR (450) RESPONSIVE TO LOCATION AND ERROR MAGNITUDE. AN INTRO-DECODER BLOCK MESSAGING SCHEME IS DESCRIBED IN WHICH ONE OR MORE COMPONENTS (410,420,430,440,450) GENERATE INACTIVITY MESSAGES (640, 650) TO SIGNAL AN ABILITY TO PROCESS DATA CORRESPONDING TO A NEXT CODEWORD. A DUAL CHIEN SEARCH BLOCK (930, 940) IMPLEMENTATION IS DESCRIBED IN WHICH CHIEN BLOCK (930) IS USED TO DETERMINE THE NUMBER OF ERRORS CORRESPONDING TO A SPECIFIED CODEWORD, SEPARATELY FROM ERROR LOCATION AND MAGNITUDE CALCULATIONS PERFORMED BY THE CHIEN/FORNEY BLOCK (940). AN ENHANCED CHIEN SEARCH CELL ARCHITECTURE IS DESCRIBED WHICH UTILIZES AN ADDITIONAL GALOIS FIELD ADDER (1140) TO SYNCHRONIZE THE CODEWORD AND ERROR VECTOR, THEREBY DECREASING DELAY AND EXPENSE CORRESPONDING TO AN ERROR CORRECTING BLOCK (950) IMPLEMENTED WITH A LIFO REGISTER (952).

24. 发明专利

MY128236A APPARATUS FOR PROVIDING SECURITY ON A POWERLINE-MODEM NETWORK 未知
公开(公告)号：MY128236A
公开(公告)日：2007-01-31
申请号：MYPI20021430
申请日：2002-04-18
申请人： THOMSON LICENSING SA
发明人： LITWIN LOUIS ROBERT JR , RAMASWAMY KUMAR , PUGEL MICHAEL ANTHONY
IPC分类号： H02J13/00 , H04M11/04 , H04B3/54 , H04L9/08 , H04M11/00
摘要： A PORTABLE SECURITY DEVICE (10) FOR SETTING UP SECURE POWERLINE MODEM NETWORKS IS DISCLOSED. THE PORTABLE SECURITY DEVICE INCLUDES A MEMORY (18) WHICH STORES A PROTOCOL (19) FOR COMMUNICATING WITH POWERLINE MODEM DEVICES (E.G.,22), AND A SOCKET (14) CONFIGURED TO RECEIVE A POWER CORD (23) FROM A POWERLINE MODEM DEVICE (22). A NUMBER ASSIGNING DEVICE (12 OR 16) TRANSMITS A PRIVATE KEY TO POWERLINE MODEM DEVICES SUCH THAT THE PRIVATE KEY IS STORED IN THE POWERLINE MODEM DEVICES AND IS USED TO ASSOCIATE A PLURALITY OF POWERLINE MODEM DEVICES AND EXCLUDE UNAUTHORIZED POWERLINE MODEM DEVICES.

25. 发明专利

BR0215819A 未知
公开(公告)号：BR0215819A
公开(公告)日：2005-06-07
申请号：BR0215819
申请日：2002-07-31
申请人： THOMSON LICENSING SA
发明人： BELOTSERKOVSKY MAXIM BORISOVIC , DEMOULIN VINCENT , LITWIN LOUIS ROBERT JR
IPC分类号： H04J11/00 , H04J1/02 , H04L25/03 , H04L27/14 , H04L27/26
摘要： The disclosed embodiments relate to a centralized buffer architecture for an Orthogonal Frequency Division Multiplexing (OFDM) receiver. In this architecture, a central buffer is shared by the main functional blocks or modules of the OFDM receiver. A state machine enables access to the buffer by the functional blocks to maintain buffer coherency.

26. 发明专利

AU781050B2 Reduced complexity FFT window synchronization for an orthogonal frequency division multiplexing system 未知
公开(公告)号：AU781050B2
公开(公告)日：2005-05-05
申请号：AU1833901
申请日：2001-02-07
申请人： THOMSON LICENSING SA
发明人： BELOTSERKOVSKY MAXIM B , LITWIN LOUIS ROBERT JR
IPC分类号： H04J11/00 , H04L25/03 , H04L27/26 , H04L12/28
摘要： An Orthogonal Frequency Division Multiplexing (OFDM) receiver that compensates for FFT window drift by extracting pilots (62) from a fast Fourier transformed (56) and equalized (58) OFDM signal, and processing the extracted pilots to derive an FFT window adjustment factor (65) and an associated equalizer tap adjustment value (67). The OFDM receiver simultaneously controls the position of an FFT window and the phase of equalizer taps using the derived FFT adjustment factor and equalizer tap adjustment value.

27. 发明专利

MXPA02006269A CORRECION DE UN DESPLAZAMIENTO DE FRECUENCIA DE MUESTREO EN UN SISTEMA DE MULTIPLEXION DE DIVIAION DE FRECUENCIA ORTOGONAL. 未知
公开(公告)号：MXPA02006269A
公开(公告)日：2004-10-15
申请号：MXPA02006269
申请日：2000-12-20
申请人： THOMSON LICENSING SA
发明人： LITWIN LOUIS ROBERT JR
IPC分类号： H04J11/00 , H04L7/00 , H04L27/26
摘要： Un receptor (60) OFDM (Multiplexacion de division de frecuencia ortogonal) que detecta y corrige el desplazamiento de frecuencia de muestreo de una senal muestreada. El receptor OFDM muestrea una senal entrante en dominio de tiempo, multiplica los datos muestreados por una funcion (124) de ventana para ensanchar la onda principal de cada uno del espectro de dominio de frecuencia de los sub-portadores predeterminados, toma una FFT (transformacion rapida Fourier) (126) de la senal muestreada para analizar las muestras de dominio de frecuencia de cada sub-portador predeterminado, detecta una diferencia en la magnitud (128) de las muestras de dominio de frecuencia para cada sub-portador predeterminado y genera un error de frecuencia en el muestro (128, 132, 134) con base en los cambios detectados en la magnitud.

28. 发明专利

AU2002256080A1 Time synchronization for data over a powerline modem network 未知
公开(公告)号：AU2002256080A1
公开(公告)日：2002-10-21
申请号：AU2002256080
申请日：2002-04-03
申请人： THOMSON LICENSING SA
发明人： LITWIN LOUIS ROBERT JR , RAMASWAMY KUMAR
IPC分类号： H04B3/54 , H04J3/06 , H04L7/00 , H04L7/04
摘要： Synchronization of a powerline modem network (10) with a plurality of devices is provided. A plurality of devices (16 and 18) each include a powerline modem (20) and a clock circuit (22) for synchronizing a data rate. The powerline modem permits data transmission between the plurality of devices over a powerline network on data carriers (28). A synchronization signal is transmitted over the powerline network. The synchronization signal includes a carrier (30) operating at a frequency different from the data carriers. The synchronization signal provides each of the plurality of devices a time reference to synchronize the data rate.

29. 发明专利

BRPI0117039B1 método e sistema para compensação de um deslocamento de frequência de portadora em um receptor ofdm 未知
公开(公告)号：BRPI0117039B1
公开(公告)日：2015-12-08
申请号：BR0117039
申请日：2001-06-22
申请人： THOMSON LICENSING SA
发明人： LITWIN LOUIS ROBERT JR , BELOTSERKOVSKY MAXIM BORISOVICH , DEMOULIN VINCENT
IPC分类号： H04J11/00 , H04L27/26 , H03L7/07 , H03L7/093 , H03L7/099 , H04L27/00
摘要： "método e sistema para compensação de um deslocamento de freqüência de portadora em um receptor ofdm". um receptor de multiplexação por divisão de freqüência ortogonal (ofdm) que emprega n laços (62-66, 74-78) de bloqueio de fase de segunda ordem compartilhando um integrador comum (72) (onde n é o número de pilotos no sistema). os n laços (62-66, 74-78) de bloqueio de fase de segunda ordem monitoram rotações de fase de piloto independentes para facilitar a mediação construtiva da informação de fase do piloto. ao mesmo tempo mediante compartilhamento de um integrador comum (72), o receptor ofdm tira proveito da mediação de ruido através de múltiplos pilotos para obter uma avaliação mais adequada do deslocamento de freqüência. o receptor ofdm também pode compensar flutuação de janela fft mediante cálculo (84) de uma diferença de fase entre um par selecionado de pilotos e monitorar (86) a taxa de mudança da diferença de fase calculada gradualmente. a diferença de fase calculada é usada para controlar a posição de uma janela fft a montante após ser excedido um limite de diferença de fase predeterminado. a taxa de mudança monitorada é usada para ajustar continuamente a fase das derivações (82) de equalizador a jusante.

30. 发明专利

MY134360A METHOD AND APPARATUS FOR INDICATING THE PRESENCE OF A WIRELESS LOCAL AREA NETWORK BY DETECTING SIGNATURE SEQUENCES 未知
公开(公告)号：MY134360A
公开(公告)日：2007-12-31
申请号：MYPI20030922
申请日：2003-03-17
申请人： THOMSON LICENSING SA
发明人： RAMASWAMY KUMAR , LITWIN LOUIS ROBERT JR , KNUTSON PAUL GOTHARD , GAO WEN , WANG CHARLES CHUANMING
IPC分类号： H04L12/28 , H04W36/00 , H04W36/14 , H04W48/18 , H04W52/02
摘要： A METHOD AND APPARATUS FOR DETECTING THE PRESENCE OF A WIRELESS LOCAL AREA NETWORK (WLAN) (104) DETECTS AT LEAST ONE SIGNATURE SEQUENCE IN A RADIO FREQUENCY (RF) SIGNAL ASSOCIATED WITH A WLAN (104). THE PRESENT INVENTION INDICATES THE PRESENCE OF A WLAN (104) IN RESPONSE TO THE DETECTION OF THE AT LEAST ONE SIGNATURE SEQUENCE IN THE RF SIGNAL.(FIG 2)

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