单载波频域均衡抗多径码元同步跟踪方法

An Anti-fading Symbol Timing Tracking Approach for SC-FDE Systems in Multipath Channels

从信道估计时域冲激响应能量出发,提出了一种运行在2倍采样率上的基于数据分组累积能量的抗多径码元定时同步跟踪方法,适合在全响应和部分响应升余弦脉冲成形QPSK调制的单载波频域均衡系统中应用。在多径信道下对该码元定时同步跟踪方法的跟踪性能进行了仿真,仿真结果表明,该码元定时同步跟踪方法具有良好的跟踪性能和抗多径、抗噪声能力。

An anti-fading symbol timing tracking approach,which is based on the accumulated energy of odd and even sampled block data and generalized from energy of the multipath channel impulse response,is proposed.This approach requires only two samples per symbol for its operation and can be operated in frequency selective channels for frequency domain equalized single carrier systems （SC-FDE） with full response or partial response raised cosine shaped QPSK modulation.Simulations in multipath channels show that the symbol timing tracking approach has good tracking performance and can be operated in multipath channels at low signal-to-noise ratio （SNR）.