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    Multicarrier modulation system with cyclic delay diversity
    41.
    发明专利
    Multicarrier modulation system with cyclic delay diversity 未知

    公开(公告)号：AU2011253562A1

    公开(公告)日：2011-12-15

    申请号：AU2011253562

    申请日：2011-11-22

    Applicant: QUALCOMM INC

    Inventor： PRASAD MALLADI DURGA ,  AVNEESH AGRAWAL ,  RAMASWAMY MURALI ,  ASHOK MANTRAVADI ,  ANASTASIOS STAMOULIS

    IPC: H04L1/00 ,  H04L5/02 ,  H04L27/26

    Abstract: Techniques to transmit data with cyclic delay diversity and pilot staggering are described. For cyclic delay diversity, OFDM symbols having different cyclic delay durations are generated. The cyclic 5 delay durations for the OFDM symbols may be selected to be time varying with respect to the cyclic delay durations for OFDM symbols transmitted by a neighboring base station. An FDM pilot is generated and multiplexed on multiple sets of subbands in different symbol periods. Waveforms for a second radio technology (e.g.. W-CDMA) may be generated for data to be transmitted with this radio technology. The OFDM symbols are multiplexed onto time slots used for OFDM. and the 10 waveforms for the second radio technology are multiplexed onto time slots used for this radio technology. One or multiple modulated signals may be generated based on the multiplexed OFDM symbols and waveforms. Each modulated signal is transmitted from a respective antenna. Start 800 Generate OFDM symbols having different cyclic delay durations ' 814 Generate and multiplex an FDM pilot on multiple sets of subbands in different symbol periods Generate W-CDMA waveforms for data to be transmitted with W-CDMA "818 Multiplex the OFDM symbols onto time slots used for OFDM ,820 Multiplex the W-CDMA waveforms onto time slots used for W-CDMA Generate one or multiple modulated signals based on the multiplexed OFDM symbols and W-CDMA waveforms t824 Transmit each modulated signal from a respective antenna End

    Preamble design for a wireless signal
    42.
    发明专利
    Preamble design for a wireless signal 未知

    公开(公告)号：AU2008321156B2

    公开(公告)日：2011-10-27

    申请号：AU2008321156

    申请日：2008-11-07

    Applicant: QUALCOMM INC

    Inventor： RAVI PALANKI ,  AAMOD KHANDEKAR ,  ALEXEI GOROKHOV ,  NAGA BHUSHAN ,  AVNEESH AGRAWAL ,  ASHWIN SAMPATH

    IPC: H04W48/08 ,  H04W72/02

    Abstract: Providing for management of wireless communications in a heterogeneous wireless access point (AP) environment is described herein. By way of example, system data of an over-the-air message can be configured to include information identifying a distinct type of transmitting base station. In some aspects, the information can include an access type of the base station and/or a sector ID for distinguishing the base station among large numbers of other base stations. According to other aspects, system data transmitted on the wireless signal can include wireless channel resources designated for a particular type of base station, or blanked by the transmitting base station, to facilitate interference reduction on such resources. By employing aspects of wireless communication management disclosed herein, efficient and reliable communication can be affected in large heterogeneous AP networks.

    Interactive channel and interference estimation an decoding
    43.
    发明专利
    Interactive channel and interference estimation an decoding 未知

    公开(公告)号：ZA200607305B

    公开(公告)日：2008-05-28

    申请号：ZA200607305

    申请日：2006-08-31

    Applicant: QUALCOMM INC

    Inventor： AAMOND KHANDEKAR ,  AVNEESH AGRAWAL ,  FUYUN LING

    IPC: H04L20090101 ,  H04L1/00 ,  H04L25/03

    Abstract: For an iterative channel and interference estimation and decoding scheme, prior information for channel gain and interference is initially obtained based on received pilot symbols. Forward information for code bits corresponding to received data symbols is derived based on the received data symbols and the prior information and then decoded to obtain feedback information for the code bits corresponding to the received data symbols. A posteriori information for channel gain and interference for each received data symbol is derived based on the feedback information for that received data symbol. The a posteriori information for the received data symbols and the prior information are combined to obtain updated information for channel gain and interference for each received data symbol. The process can be repeated for any number of iterations. The prior, a posteriori, and updated information may be represented by joint probability distributions on channel gain and interference. The forward and feedback information may be represented by log-likelihood ratios.

    Power control using erasure techniques
    46.
    发明专利
    Power control using erasure techniques 未知

    公开(公告)号：AU2005262560A1

    公开(公告)日：2006-01-19

    申请号：AU2005262560

    申请日：2005-06-07

    Applicant: QUALCOMM INC

    Inventor： JULIAN DAVID JONATHAN ,  SUTIVONG ARAK ,  AVNEESH AGRAWAL

    IPC: H04L1/00 ,  H04B7/005 ,  H04L1/20

    Abstract: Techniques for performing erasure detection and power control for a transmission without error detection coding are described. For erasure detection, a transmitter transmits codewords via a wireless channel. A receiver computes a metric for each received codeword, compares the computed metric against an erasure threshold, and declares the received codeword to be "erased" or "non-erased". The receiver dynamically adjusts the transmit power based on whether the codewords met the erasure threshold or not.

    USING ORTHOGONAL WAVEFORMS TO ENABLE MULTIPLE TRANSMITTERS TO SHARE A SINGLE CDM CHANNEL
    48.
    发明专利
    USING ORTHOGONAL WAVEFORMS TO ENABLE MULTIPLE TRANSMITTERS TO SHARE A SINGLE CDM CHANNEL 未知

    公开(公告)号：MY119079A

    公开(公告)日：2005-03-31

    申请号：MYPI9701431

    申请日：1997-04-02

    Applicant: QUALCOMM INC

    Inventor： BUTLER BRIAN K ,  AVNEESH AGRAWAL

    IPC: H04B7/216 ,  H04B1/04 ,  H04B7/26 ,  H04J11/00 ,  H04J13/00 ,  H04J13/18 ,  H04Q7/38

    Abstract: A SYSTEM AND METHOD FOR ENABLING MULTIPLE TRANSMITTERS (400) TO SHARE A SINGLE CODE DIVISION MULTIPLEXED (CDM) OR CODE DIVISION MULTIPLE ACCESS (CDMA) CHANNEL USING ORTHOGONAL WAVEFORMS. A SET OF ORTHOGONAL CHANNELIZING CODES WI(T) IS GENERATED, AND EACH TRANSMITTER (400) IS ALLOCATED ORTHOGONAL CHANNELIZING CODES AND PSEUDONOISE POLYNOMIALS IN A PREDETERMINED MANNER. THE TRANSMITTERS CHANNELIZE EACH USER SIGNAL USING AN ORTHOGONAL CHANNELIZING CODE WI(T), AND SPREAD EACH USER SIGNAL USING A PSEUDONOISE (PN) SPREADING CODE. EACH TRANSMITTER EMPLOYS THE SAME PN SPREADING CODES AND TIME OFFSETS. ADDITIONALLY, NO ONE ORTHOGONAL CHANNELIZING CODE IS ASSIGNED TO MORE THAN ONE TRANSMITTER DURING THE TIME PERIOD THEY ARE SHARING A CDM CHANNEL. THE SPREAD SIGNALS ARE SUMMED AT EACH TRANSMITTER (404) PRIOR TO TRANSMISSION AS A COMPOSITE SIGNAL. THE OFFSETS ARE TIME-PRECORRECTED (406, 510) TO ENSURE TIME ALIGNMENT AT THE RECEIVERS. THE FREQUENCIES OF THE SIGNALS ARE PRECORRECTED (408, 512) TO ENSURE FREQUENCY ALIGNMENT AT THE RECEIVERS.FIGURE 4A

    confirmação de recebimento de mensagens de controle em um sistema de comunicação sem fio
    49.
    发明专利
    confirmação de recebimento de mensagens de controle em um sistema de comunicação sem fio 未知

    公开(公告)号：BRPI0719753B1

    公开(公告)日：2021-05-04

    申请号：BRPI0719753

    申请日：2007-11-30

    Applicant: QUALCOMM INC

    Inventor： AAMOD KHANDEKAR ,  ALEXEI GOROKHOV ,  ARNAB DAS ,  AVNEESH AGRAWAL ,  SUNDEEP RANGAN

    IPC: H04L1/16 ,  H04L5/00 ,  H04W28/04 ,  H04W72/04 ,  H04W92/10

    Abstract: confirmação de recebimento de mensagens de controle em um sistema de comunicação sem fio técnicas de envio de mensagens de controle são descritas. em um aspecto, mensagens de designação podem ter seu recebimento confirmado com base em recursos ack conectados ou dedicados. um terminal pode receber uma mensagem de atribuição de uma estação base, determinar se confirma o recebimento da mensagem de atribuição, e determinar os recursos ack para usar para confirmar o recebimento da mensagem de atribuição. os recursos ack podem ser conectados a um bloco de controle no qual a mensagem de atribuição foi recebida, conectados aos recursos fornecidos pela mensagem de atribuição, ou designados para o terminal. o terminal pode enviar a confirmação de recebimento nos recursos ack. em outro aspecto, uma mensagem de controle pode ter seu recebimento confirmado com base nos recursos ack determinados com base na mensagem de controle ou no bloco de controle. os recursos ack podem ser conectados aos recursos atribuídos pela mensagem de controle ou conectados à mensagem de controle. o terminal pode enviar uma confirmação de recebimento para a mensagem de controle nos recursos ack.

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