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本文提出了用判决反馈前馈(DFF)来克服前导符号间干扰的新概念。文中给出了有、无迫零限制均方准则下的最佳接收机及相应的自适应算法,得到了迫零条件下DFFE的误码率的一个上界,证明了不论有、无迫零限制,判决反馈(DFE)加上前馈滤波,均能降低误码率。计算机模拟表明自适应算法是可行的。 若取消前置均衡就得到无前置DFFE。它结构简单,收敛和信道无关,抽头数最少。
This paper proposes a new concept of decision feedback feedforward (DFF) to overcome the interference between preamble symbols. In this paper, the best receivers and corresponding adaptive algorithms with and without zero-forcing limit-mean-square criterion are given, and an upper bound of the bit error rate of DFFE under zero-forcing condition is obtained. It is proved that no-zero Limit, decision feedback (DFE) plus feedforward filtering, can reduce the bit error rate. Computer simulation shows that the adaptive algorithm is feasible. If you cancel the pre-equilibrium will be no pre-DFFE. It is simple in structure, has nothing to do with channel convergence and has the least number of taps.