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    METHOD AND APPARATUS FOR MITIGATING ADJACENT CHANNEL INTERFERENCE IN A WIRELESS COMMUNICATION SYSTEM
    32.
    发明专利
    METHOD AND APPARATUS FOR MITIGATING ADJACENT CHANNEL INTERFERENCE IN A WIRELESS COMMUNICATION SYSTEM 未知

    公开(公告)号：CA2465729A1

    公开(公告)日：2003-05-15

    申请号：CA2465729

    申请日：2002-10-29

    Applicant: QUALCOMM INC

    Inventor： FERNANDEZ-CORBATON IVAN JESUS ,  JAYARAMAN SRIKANT ,  SMEE JOHN E

    IPC: H04B1/707 ,  H04B1/00 ,  H04B1/10

    Abstract: Techniques for detecting and mitigating adjacent channel interference (ACI) in a wireless (e.g., CDMA) communication system. In one aspect, ACI may be determined by signaling or detected by filtering a pre-processed signal in each frequency range where ACI may be present (e.g., with a respective bandpass filter), estimating the energy of the filtered signal for each frequency range, comparing the estimated energy against an ACI threshold, an d indicating the presence or absence of ACI at each frequency range based on t he result of the comparison. In another aspect, a selectable filter (e.g., a FI R filter) having a number of possible filter responses (e.g., provided by a number of sets of filter coefficients) may be used to provide filtering for the pre-processed signal and to reject any detected ACI. One of the possible filter responses is selected for use depending on whether and where ACI has been detected.

    método e equipamento para equalização de realimentação de decisão híbrida
    33.
    发明专利
    método e equipamento para equalização de realimentação de decisão híbrida 未知

    公开(公告)号：BRPI0312747B1

    公开(公告)日：2016-11-22

    申请号：BR0312747

    申请日：2003-07-18

    Applicant: QUALCOMM INC

    Inventor： FERNANDEZ-CORBATON IVAN JESUS ,  SMEE JOHN E ,  JAYARAMAN SRIKANT

    IPC: H04L25/00 ,  H04L27/01 ,  H04B7/005 ,  H04L25/03

    Abstract: "método e equipamentopara equalização de realimentação de decisão híbrida" descreve-se um método e um equipamento para um equalizador de realimentação de decisão, nos quais um termo de correção é utilizado para compensar erros de corte, evitando-se assim a programação de erros. os coeficientes de filtro para o equalizador são selecionados de modo a se minimizar uma função de custo para o equalizador, que inclui um termo de correção como uma função da energia dos coeficientes de filtro. o equalizador inclui um gerador de coeficientes que responde ao termo de correção. uma modalidade estima um símbolo transmitido a partir de uma amostra recebida como uma função da relação sinal/interferência e ruído (sinr) da amostra recebida. a amostra recebida é quantizada e mapeada em uma região de uma grade sobreposta na constelação de símbolos transmitida. a região pode corresponder a um valor de estimativa de símbolo ou pode ser processada adicionalmente de modo a se obter um valor de estimativa de símbolo.

    METHOD AND APPARATUS FOR HYBRID DECISION FEEDBACK EQUALIZATION
    35.
    发明专利
    METHOD AND APPARATUS FOR HYBRID DECISION FEEDBACK EQUALIZATION 未知

    公开(公告)号：CA2493106C

    公开(公告)日：2014-11-25

    申请号：CA2493106

    申请日：2003-07-18

    Applicant: QUALCOMM INC

    Inventor： JAYARAMAN SRIKANT ,  FERNANDEZ CORBATON IVAN JESUS ,  SMEE JOHN E

    IPC: H04L25/03 ,  H04L27/01 ,  H04B7/005 ,  H04L25/00

    Abstract: A method and apparatus for a decision feedback equalizer wherein a correction term is used to compensate for slicer errors, thus avoiding error propagation. Filter coefficients for the equalizer are selected so as to minimize a cost function for the equalizer, including a correction term as a function of the energy of the filter coefficients. The equalizer includes a coefficient generator responsive to the correction term. One embodiment estimates a transmitted symbol from a received sample as a function of Signal-to-Interference and Noise Ratio (SINR) of the received sample. The received sample is quantized and mapped to a region of a grid overlaid on the transmitted symbol constellation. The region may correspond to a symbol estimate value or may be processed further to obtain a symbol estimate value.

    Synchronized broadcast/multicast communication
    36.
    发明专利
    Synchronized broadcast/multicast communication 未知

    公开(公告)号：AU2010202417B2

    公开(公告)日：2013-09-05

    申请号：AU2010202417

    申请日：2010-06-10

    Applicant: QUALCOMM INC

    Inventor： BLACK PETER JOHN ,  JACOBS PAUL E ,  GROB MATTHEW S ,  JAYARAMAN SRIKANT

    IPC: H04L5/02 ,  H04B1/707 ,  H04L27/26

    Abstract: Synchronized broadcast transmits a same broadcast content using a same waveform from multiple transmitters. Transmitters each apply a same spreading code for broadcast transmissions. In 5 a spread-spectrum communication system having a time division multiplexed forward link, a synchronized broadcast transmission is inserted into a broadcast slot. One embodiment employs an Orthogonal Frequency Divisional Multiplex (OFDM) waveform for the synchronized broadcast. An OFDM receiver is then used to process the received synchronized broadcast transmission. An alternate embodiment implements a broadcast Pseudo-random Noise (PN) code for use by multiple 10 transmitters. An equalizer is then employed to estimate the synchronized broadcast transmission. z co C0 C)-J c I L m C) 0 C)o cL L Uo 0z _ HL F-~

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