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    • 9. 发明申请
    • METHOD AND APPARATUS FOR IMPROVING CHANNEL ESTIMATE IN PRESENCE OF SHORT SPREADING CODES
    • 改善短暂传播码通道估计的方法和装置
    • WO2005025165A1
    • 2005-03-17
    • PCT/US2004/027722
    • 2004-08-25
    • QUALCOMM INCORPORATEDZHANG, Haitao
    • ZHANG, Haitao
    • H04L25/02
    • H04L25/0228H04B1/7075H04L25/0212H04L25/0226
    • A method and apparatus for estimating a communication channel impulse response h(t) is disclosed. The method comprises the steps of generating co m (t) = co(t + mNT cc ) for m = 0,1,Λ , M by correlating a received signal r(t) with a spreading sequence S i of length N (208), wherein the received signal r(t) comprises a chip sequence c j applied to a communication channel characterizable by an impulse response h(t) (204), and wherein the chip sequence c i is generated from a data sequence d i spread by the spreading sequence S i (202); generating an estimated communication channel impulse response h M (t) as a combination of co m (t) and d m for m = 0,1, Λ ,M (210); and filtering the first estimated communication channel impulse response h M (t) to generate the estimated communication channel impulse response h(t) with a filter f selected at least in part according to the spreading sequence S i (212).
    • 公开了一种用于估计通信信道脉冲响应h(t)的方法和装置。 该方法包括以下步骤:通过将接收信号r(t)与长度为N(208)的扩频序列Si相关联来产生m = 0,1,λ,M的com(t + mNTcc),其中 接收信号r(t)包括应用于通过脉冲响应h(t)(204)表征的通信信道的码片序列cj,并且其中码片序列ci是由扩展序列si 202); 对于m = 0,1,λ,M(210),产生作为com(t)和dm的组合的估计的通信信道脉冲响应hM(t); 并且用至少部分地根据扩展序列Si(212)选择的滤波器f来对第一估计通信信道脉冲响应h M(t)进行滤波以产生估计的通信信道脉冲响应h(t)。
    • 10. 发明申请
    • EQUALIZER
    • 均衡器
    • WO2004098138A1
    • 2004-11-11
    • PCT/US2004/012581
    • 2004-04-23
    • QUALCOMM INCORPORATEDSMEE, John E.ZHANG, Haitao
    • SMEE, John E.ZHANG, Haitao
    • H04L25/03
    • H04L25/0314H04L25/03159
    • The LE coefficients for CDM pilot systems can be determined based upon frequency-domain calculations involving channel impulse responses. A channel impulse response can be formed at the mobile terminal by suitably filtering and despreading the received baseband signal with respect to the pilot Walsh channel. The channel frequency response is then determined based on the fast Fourier transform (FFT) of the channel impulse response. Frequency-domain equalizer coefficients can be determined from the channel frequency response. The frequency-domain equalizer coefficient can be utilized to determine time-domain equalizer coefficients to implement the equalizer in time domain, or be utilized to implement the equalizer in frequency domain
    • 可以基于涉及信道脉冲响应的频域计算来确定CDM导频系统的LE系数。 通过适当地对接收的基带信号相对于导频沃尔什信道进行滤波和解扩,可以在移动终端形成信道脉冲响应。 然后,基于信道脉冲响应的快速傅里叶变换(FFT)来确定信道频率响应。 可以从信道频率响应确定频域均衡器系数。 频域均衡器系数可用于确定时域均衡器系数以在时域中实现均衡器,或用于在频域中实现均衡器