【作者】 陈艳霞；

【导师】 金力军；

【作者基本信息】 西安电子科技大学 ， 通信与信息系统， 2006， 硕士

【摘要】 网格编码技术能够再不增加带宽和发送功率的前提下提高系统的误码性能。本文在简要叙述了连续相位调制的基本原理的基础上,研究了将网格编码与其相结合的调制制度。通过理论分析和系统仿真证明了基于CPM分解表示法的编码调制方式的有效性。信道相位的非线性导致了采用CPM系统的误码性能下降,文中对信道的相位均衡进行了深入的研究,设计并实现了一种相位均衡网络,能够根据已知的信道群延迟特性,通过一个补偿滤波器对其进行补偿,满足系统线性相位的要求。结合FPGA实现本文提出了一种用FIR滤波器逼近IIR滤波器的方法。更多还原

【Abstract】 Trellis coding techniques can achieve improved error probability performance with no increase in bandwidth and energy over the uncoded case. After the CPM system model being briefly recalled, the combination of trellis encoder and CPM modulator was studied. The coding optimization approach based on CPM decomposition method was verified by analysis and simulation.The error probability performance of the CPM system was terribly affected by nonlinear-phase c haracteristic o f a c hannel, s o a m ethod o f p hase e qualization w as represented in the paper. Based on the relationship of the group delay function and the cepstral coefficients of a stable all-pass filter, a group delay characteristic desired can be realized approximately through designing such a all-pass filter.And a method of using FIR filters to approximate to IIR filters was presented.更多还原