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    82.
    发明专利
    未知

    公开(公告)号：BR9914541A

    公开(公告)日：2002-01-02

    申请号：BR9914541

    申请日：1999-10-12

    Applicant: QUALCOMM INC

    Inventor： SINDHUSHAYANA NAGGABHUSHANA ,  STEIN JEREMY ,  VIJAYAN RAJIV ,  LING FUYUN

    IPC: G06F11/10 ,  H03M13/27 ,  H03M13/29 ,  H04L1/00

    Abstract: The present invention is a novel and improved technique for performing coding with particular application to turbo, or iterative, coding techniques. In accordance with one embodiment of the invention, interleaving is performed by generating the address of a memory using a PN state generator. Data is written into a memory in sequential order, and then read out using addresses specified by the PN state generator. To deinterleave, the interleaved data is written into a memory using addresses specified by the PN state generator, and then read out in sequential order. A set of PN state generators that provide excellent coding performance is provided.

    System and method for the demodulation of turbo-encoded signals via pilot assisted coherent demodulation
    83.
    发明专利
    System and method for the demodulation of turbo-encoded signals via pilot assisted coherent demodulation 未知

    公开(公告)号：AU4852300A

    公开(公告)日：2000-12-05

    申请号：AU4852300

    申请日：2000-05-15

    Applicant: QUALCOMM INC

    Inventor： LING FUYUN ,  SINDHUSHAYANA NAGABHUSHANA T ,  ESTEVES EDUARDO A S

    IPC: H04B1/7097 ,  H03M13/23 ,  H03M13/25 ,  H03M13/29 ,  H04L1/20 ,  H04L25/02

    Abstract: An efficient telecommunications receiver system for accurately decoding a received composite signal having a data signal component and a pilot signal component includes a first circuit for receiving the composite signal and extracting a pilot signal and a data signal from received composite signal. A second circuit calculates a log-likelihood ratio as a function of a channel estimate based on the pilot signal. A third circuit scales the log-likelihood ratio by a predetermined log-likelihood ratio scaling factor and provides an accurate log-likelihood value in response thereto. A fourth circuit decodes the received composite signal based on the accurate log-likelihood value and the data signal. The third circuit includes a carrier signal-to-interference ratio circuit for computing a first signal-to-interference ratio and a second signal-to-interference ratio based partly on the pilot signal.

    Amplitude and phase estimation method in a wireless communication system
    84.
    发明专利
    Amplitude and phase estimation method in a wireless communication system 未知

    公开(公告)号：AU4835400A

    公开(公告)日：2000-12-05

    申请号：AU4835400

    申请日：2000-05-10

    Applicant: QUALCOMM INC

    Inventor： LING FUYUN

    IPC: H04B1/7085 ,  H04B1/7115 ,  H04B7/005 ,  H04L25/02 ,  H04Q7/38

    Abstract: Apparatus for a transmitter and a receiver which enhance the performance of a system coherent demodulation by utilizing non-pilot sub-channels to enhance the accuracy of estimates of amplitude and phase noise inherent in the transmission channel is described. This enhancement is accomplished by utilizing the corrected received data on a fundamental channel to enhance a pilot channel estimate, which is subsequently utilized by a dot product module in demodulating a supplementary data channel.

    esquema de codificação para um sistema de comunicação sem fio
    85.
    发明专利
    esquema de codificação para um sistema de comunicação sem fio 未知

    公开(公告)号：BRPI0206877B1

    公开(公告)日：2016-03-22

    申请号：BR0206877

    申请日：2002-01-23

    Applicant: QUALCOMM INC

    Inventor： LING FUYUN ,  FERNANDEZ IVAN ,  WALTON JAY R ,  WALLACE MARK ,  SINDHUSHAYANA NAGABHUSHANA T

    IPC: H04J11/00 ,  H04L27/26 ,  H04B7/04 ,  H04J99/00 ,  H04L1/00

    Abstract: "esquema de codificação para um sistema de comunicação sem fio". técnicas de codificação para um (por exemplo, ofdm) sistema de comunicação capaz de transmitir dados em vários canais de transmissão em diferentes taxas de bit de informação com base na snr alcançada do canal. um código base é utilizado em combinação com o puncionamento comum ou variável para alcançar diferentes taxas de codificação necessárias para os canais de transmissão. os dados (isso é, bits de informação) para uma transmissão de dados são codificados com o código base, e os bits codificados para cada: canal (ou grupo de canais com capacidades de transmissão similares) são puncionados para alcançar a taxa de codificação necessária. os bits codificados podem ser intercalados (por exemplo, para combater o desvanecimento e remover a correlação entre os bits codificados em cada símbolo de modulação) antes do puncionamento. os bits de códigos não-puncionados são agrupados em símbolos não-binários (por exemplo, utilizando o mapeamento de gray). o símbolo de modulação pode ser pré-condicionado antes da transmissão.

    86.
    发明专利
    未知

    公开(公告)号：BRPI0618058A2

    公开(公告)日：2011-08-16

    申请号：BRPI0618058

    申请日：2006-10-31

    Applicant: QUALCOMM INC

    Inventor： VRCELJ BOJAN ,  LING FUYUN ,  WANG MICHAEL MAO

    IPC: H04L27/26

    Abstract: Methods and apparatus for setting timing of sampling of one or more symbols. The disclosed methods account for at least three types of effective interference (EI) and are used to set the timing of a sampling window for sampling received symbols. The methods includes setting timing based on determining an energy density function accounting for both static and dynamic EI, determining the minimum of a total energy profile and sliding the sampling window to ensure that the minimum point is at a predetermined point, and determining and using a composite energy profile accounting for short term and long term fading effects. The disclosed apparatus include a transceiver employing one or more of the disclosed methods for setting timing when receiving the symbols.

    87.
    发明专利
    未知

    公开(公告)号：BRPI0706300A2

    公开(公告)日：2011-03-22

    申请号：BRPI0706300

    申请日：2007-01-03

    Applicant: QUALCOMM INC

    Inventor： LING FUYUN ,  MUKKAVILLI KRISHNA KIRAN ,  WALKER KENT G

    IPC: H04L1/20 ,  H04L27/26

    Abstract: Methods and apparatus for noise estimation in a communication system. In an aspect, a method for noise and interference estimation is provided. The method includes identifying one or more unmodulated subcarriers in a received waveform, processing the one or more unmodulated subcarriers to produce a demodulated output, and determining a noise variance based on the demodulated output. In another aspect, an apparatus for providing a noise and interference estimation is provided. The apparatus includes selection logic configured to identify one or more unmodulated subcarriers in a received waveform, a processor configured to demodulate the one or more unmodulated subcarriers to produce a demodulated output, and variance determination logic configured to determine a noise variance based on the demodulated output.

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