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介绍一种用于无线衰落多径信道数据通信的高速串行 MODEM系统 ,在此系统中 ,将自适应判决反馈均衡器 ( DFE)与软判决 Viterbi译码相结合 ,在没有增加系统复杂性和运算量的条件下实现了最大似然序列判决反馈均衡器 ,改善了因错误传播对 DFE性能的影响 ,从而提高了系统抗多径和噪声干扰的能力 .模拟结果表明 ,在有严重多径干扰的条件下 ,误比特率为 1 0 -4 时 ,使用 MLSE判决 DFE比使用直接判决 DFE的串行 MODEM性能优约 4 .5d B.
A high speed serial MODEM system for wireless fading multipath channel data communication is introduced. In this system, adaptive decision feedback equalizer (DFE) is combined with soft decision Viterbi decoding without adding system complexity and The maximum likelihood sequence decision feedback equalizer is realized under the condition of computational complexity and the effect of error propagation on the performance of DFE is improved and the anti-multipath and noise immunity of the system is improved.The simulation results show that in the presence of severe multipath interference , The bit error rate is 1 0 -4, the use of MLSE decision DFE than the use of direct decision DFE serial MODEM performance about 4.5d B.