数字并行接收机在时变信道下的信道估计与均衡方法

为了适应高速宽带无线通信的需要,本文在一种高速数字并行接收机(APRX)结构的基础上,提出了一种时变信道下的信道估计和均衡方法。使用伪随机(pseudo-randomnumber,PN)序列相关进行信道估计,将所得到的信道频率响应粗估计按照一个DFT块的长度在一帧内进行线性内插得到信道频率响应细估计,将其用来在频域进行信道均衡。这种结构能适应高速率传输的要求,并且能有效地对抗时间和频率选择性衰落。仿真结果表明,在多径衰落信道下,APRX已经无法工作,而本文提出的数字并行接收机的信道估计和均衡方法有较好的性能,并且该方法实现简单,便于应用。

A Channel Estimation and Equalization Method for Approximate Parallel Receiver over Time-varying Channels

To face the challenge of high data throughput requirements for wideband wireless communications, based on an approximate parallel receiver (APRX) structure, this paper proposes a channel estimation and equalization method in a time-varying channel. It uses pseudo-random number (PN) sequence correlation to get the course channel estimation, and obtains the refined channel estimation through DFT block-wise linear interpolation over one frame, which is used for channel equalization in the frequency domain. The proposed structure can not only meet the requirement of high-speed transmission, but also effectively suppress time and frequency selective fading. Simulations show that APRX fails to work in the multipath fading channel, while the proposed channel estimation and equalization method for digital parallel receiver has good performance.Moreover, the proposed structure can be easily implemented and applied.