突发传输中ZP-OFDM的信道估计和跟踪

Channel Estimation and Tracking for ZP-OFDM in Burst Mode

在缓变信道的突发传输模式中,信道估计通常采用前导(preamble)的方法,并假设在突发过程中信道不变。但是,由于信道实际在不同的OFDM符号中是缓变的,因此这种假设导致了系统性能的下降。在这里,针对ZP-OFDM系统,该文给出了一种低复杂度的信道估计和跟踪方法。它在突发传输的第1个OFDM符号中利用梳状导频的方法进行信道估计,在随后的OFDM符号中利用在时域只插入1位训练位的方法来实现信道的跟踪。仿真结果表明,该方法提高了系统的性能。

For burst mode in slowly time-varying channel, channel state information can be obtained mostly based on preamble and supposed maintain constant. In fact, for different OFDM symbol, channel change slowly, so the assumption degrades the system performance. A low-complexity technique is presented to estimate and track the channel for ZP-OFDM. Channel state information can be obtained in the first OFDM symbol based on comb-type pilots and tracked by insert a bit in time-domain for others OFDM symbols. Simulation results verify the improved performance of the proposed method.