数字并行接收机的反馈频域均衡方法

为了适应高速宽带无线通信的需要,在一种高速数字并行接收机(APRX)结构的基础上,提出了一种使用伪随机(pseudo-random num ber,PN)序列进行反馈频域均衡的方法,通过PN序列相关估计的信道冲激响应反馈到频域均衡器来更新并行接收机频域均衡器系数,这种结构能适应高速率传输的要求,并且能有效地对抗频率选择性衰落。仿真结果表明:在多径信道下,APRX已无法工作,而提出的反馈频域均衡方法性能较好,仅与G auss ian白噪声信道下有约5 dB的性能损失,且实现简单,便于应用。

Feedback frequency domain equalization for approximate parallel receiver

A feedback frequency domain equalization method based on an approximate parallel receiver(APRX) structure was developed to improve data throughput for wideband wireless communications.The method uses pseudo-random number sequence correlation to get the channel estimate,and then feeds the estimated channel coefficients back to update the frequency-domain equalizer coefficients.The structure not only improves high-speed transmissions,but also effectively suppresses frequency selective fading.Simulations show that APRX can not work in multipath channel environments,while that the urment feedback frequency domain equalization method works well with only 4 dB performance degradation with an additive white Gaussian noise channel.