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    • 5. 发明申请
    • METHOD AND APPARATUS FOR IMPROVING THE EQUALISATION OF BLOCK CODED SIGNALS
    • 改善块编码信号均衡的方法和装置
    • WO2005002163A3
    • 2005-03-24
    • PCT/US2004020360
    • 2004-06-23
    • QUALCOMM INCSMEE JOHN EZHANG HAITAO
    • SMEE JOHN EZHANG HAITAO
    • H04L25/03
    • H04L25/03063H04L25/03171
    • Improved decision directed adaptation and decision feedback equalizers are provided in a block coded digital communication system. The performance of a receiver is significantly improved by allowing the decision feedback equalizer to perform time-tracking and residual frequency offset compensation during the data portion of a frame. This is accomplished by capitalizing on the inherent correlation among the chips of a code word in a block coded digital communication system to identify certain instances where more reliable symbol estimates can be derived from a sliced chip without introduction the delay inherent in decoding. As the more reliable symbol estimates are fed back into the chip slicer, the total efficiency of the decision feedback equalizer is improved and the more reliable symbol estimates can be used to replace older content in the feedback filter to further improve the accuracy of the modified slicer input and further decrease the effects of error propagation by the decision feedback equalizer.
    • 在分组编码数字通信系统中提供改进的决策指导自适应和判决反馈均衡器。 通过允许判决反馈均衡器在帧的数据部分期间执行时间跟踪和残余频率偏移补偿,接收机的性能得到显着改善。 这是通过利用块编码数字通信系统中码字的码片之间固有的相关性来实现的,以识别某些情况,其中可以从切片芯片导出更可靠的码元估计而不引入解码中固有的延迟。 随着更可靠的符号估计被反馈到芯片限幅器中,判决反馈均衡器的总效率得到改善,并且可以使用更可靠的符号估计来代替反馈滤波器中的旧内容,以进一步提高修改后的限幅器的准确度 并通过判决反馈均衡器进一步降低误差传播的影响。