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393 records (took 0.025 seconds)

    132.
    发明专利
    未知

    公开(公告)号：NO20070242A

    公开(公告)日：2007-01-18

    申请号：NO20070242

    申请日：2007-01-15

    Applicant: QUALCOMM INC

    Inventor： AGRAWAL AVNEESH ,  SUTIVONG ARAK

    IPC: H04J11/00 ,  H04J13/06 ,  H04L5/02 ,  H04Q7/30 ,  H04Q11/00

    CPC classification number: H04L5/023 ,  H04B1/7143 ,  H04J13/00 ,  H04L5/0023 ,  H04L5/003 ,  H04L5/0042

    Abstract: For quasi-orthogonal multiplexing in an OFDMA system, multiple (M) sets of traffic channels are defined for each base station. The traffic channels in each set are orthogonal to one another and may be pseudorandom with respect to the traffic channels in each of the other sets. The minimum number of sets of traffic channels (L) is used to support a given number of (U) terminals selected for data transmission, where and . Each terminal transmits data and pilot symbols on its traffic channel. A base station receives data transmissions from all terminals and may perform receiver spatial processing on received symbols with spatial filter matrices to obtain detected data symbols. The spatial filter matrix for each subband may be derived based on channel response estimates for all terminals transmitting on that subband.

    Pilot and data transmission in a MIMO system applying subband multiplexing
    134.
    发明专利
    Pilot and data transmission in a MIMO system applying subband multiplexing 未知

    公开(公告)号：AU2006259598A1

    公开(公告)日：2006-12-28

    申请号：AU2006259598

    申请日：2006-06-09

    Applicant: QUALCOMM INC

    Inventor： SUTIVONG ARAK ,  KHANDEKAR AAMOD ,  PALANKI RAVI

    IPC: H04L27/26 ,  H04B7/06 ,  H04B7/08 ,  H04J99/00 ,  H04L1/06 ,  H04L5/02

    Abstract: In a single-carrier frequency division multiple access (SC-FDMA) system that utilizes interleaved FDMA (IFDMA) or localized FDMA, multiple transmitters may transmit their pilots using time division multiplexing (TDM), code division multiplexing (CDM), interleaved frequency division multiplexing (IFDM), or localized frequency division multiplexing (LFDM). The pilots from these transmitters are then orthogonal to one another. A receiver performs the complementary demultiplexing for the pilots sent by the transmitters. The receiver may derive a channel estimate for each transmitter using an MMSE technique or a least-squares technique. The receiver may receive overlapping data transmissions sent on the same time-frequency block by the multiple transmitters and may perform receiver spatial processing with spatial filter matrices to separate these data transmissions. The receiver may derive the spatial filter matrices based on the channel estimates for the transmitters and using zero-forcing, MMSE, or maximal ratio combining technique.

    RECEPTION OF H-ARQ TRANSMISSIONS WITH INTERFERENCE CANCELLATION IN A QUASI-ORTHOGONAL COMMUNICATION SYSTEM
    135.
    发明专利
    RECEPTION OF H-ARQ TRANSMISSIONS WITH INTERFERENCE CANCELLATION IN A QUASI-ORTHOGONAL COMMUNICATION SYSTEM 未知

    公开(公告)号：CA2609761A1

    公开(公告)日：2006-12-14

    申请号：CA2609761

    申请日：2006-05-25

    Applicant: QUALCOMM INC

    Inventor： NAGUIB AYMAN FAWZY ,  GOROKHOV ALEXEI ,  SUTIVONG ARAK ,  JI TINGFANG ,  GORE DHANANJAY ASKOK

    IPC: H04Q7/00

    Abstract: To receive packets with interference cancellation, block transmissions for the packets are received on time-frequency blocks used by these packets. Receiver spatial processing is performed on input symbols to obtain detected symbols. Each packet is demodulated and decoded based on all detected symbols obtained for all block transmissions received for the packet. For each packet that is decoded correctly, the transmission for the packet is terminated, the interference due to the packet is estimated, and the estimated interference is subtracted from the input symbols for all time-frequency blocks used by the packet. Receiver spatial processing is performed on the interference-canceled symbols to obtain new detected symbols for all time-frequency blocks used by all correctly decoded packets. Each packet decoded in error and overlapping at least partially with any correctly decoded packet may be demodulated and decoded based on all detected symbols available for that packet.

    METODO Y APARATO PARA LLEVAR A CABO L A DETECCION DE LOS BORRADOS EN UN SISTEMA DE COMUNICACIONES
    138.
    发明专利
    METODO Y APARATO PARA LLEVAR A CABO L A DETECCION DE LOS BORRADOS EN UN SISTEMA DE COMUNICACIONES 未知

    公开(公告)号：AR049926A1

    公开(公告)日：2006-09-13

    申请号：ARP050102523

    申请日：2005-06-17

    Applicant: QUALCOMM INC

    Inventor： SUTIVONG ARAK ,  AVNEESH AGRAWAL ,  JULIAN DAVID JONATHAN

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

    Abstract: Técnicas para llevar a cabo la deteccion de los borrados y el control de la potencia para una transmision son codificacion de la deteccion de errores. Para la deteccion de los borrados, un transmisor transmite palabras de cogido por intermedio de un canal inalámbrico. Un receptor calcula una métrica para cada palabra de codigo recibida, compara la métrica calculada con un umbral de borrado, y declara la palabra de codigo recibida como ôborradaö o ôno borradaö. El receptor ajusta dinámicamente el umbral de borrado sobre la base de palabras de codigo recibidas conocidas para lograr un nivel teorico de performance. Para el control de la potencia, un bucle interior ajusta la potencia de transmision para mantener una calidad de la senal recibida, SNR, a un SNR teorico. Un bucle exterior ajusta el SNR teorico sobre la base del status de las palabras de codigo recibidas (borrados o no borrados) para lograr un coeficiente teorico de borrado. Un tercer bucle ajusta el umbral de borrado sobre la base del status de palabras de codigo recibidas conocidas (ôbuenasö, ômalasö o borradas), para lograr un coeficiente teorico condicional de los errores.

    MC-CDMA MULTIPLEXING IN AN ORTHOGONAL UPLINK
    139.
    发明专利
    MC-CDMA MULTIPLEXING IN AN ORTHOGONAL UPLINK 未知

    公开(公告)号：CA2591478A1

    公开(公告)日：2006-06-29

    申请号：CA2591478

    申请日：2005-12-22

    Applicant: QUALCOMM INC

    Inventor： SUTIVONG ARAK ,  AGRAWAL AVNEESH

    IPC: H04B1/713 ,  H04L5/02 ,  H04L27/26

    Abstract: Techniques are provided to support multi-carrier code division multiple access (MC-CDMA) in an orthogonal uplink of a wireless communication system. A method of wireless multi-carrier communications comprises dividing sub-carriers on an uplink into non-overlapping groups, allocating a time-frequency block including a hopping duration and a non-overlapped group, respectively, assigning a different set of orthogonal codes to each user, spreading data (or pilot) symbols of each user over the allocated time-frequency block, wherein the data (or pilot) symbols of each user are spread using the different set of orthogonal codes assigned to each user, mapping each data (or pilot) symbol to a modulation symbol in the time-frequency block, generating an orthogonal waveform based on the mapped symbols, and transmitting the orthogonal waveform.

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