改进的载波频率相位联合估计方案及其FPGA实现

An Improved Carrier Frequency and Phase Joint Estimation Scheme and Its FPGA Implementation

针对时分多址(TDMA)突发传输通信系统中的同步问题,提出了一种改进的载波频率和相位联合估计方案.该方案利用传统突发传输通信系统数据帧结构中用于位定时估计的训练序列,同时实现载波频率偏差、位定时偏差和载波相位估计.采用该方案,可缩短或完全去除传统的采用突发模式传输的通信系统训练序列中用于载波频率估计的部分,有效地提高时分多址系统的频谱利用率.在FPGA平台上对该方案做了硬件实现,综合结果表明其最大工作时钟频率可达70 MHz,可用于高速宽带数据传输系统.

In order to solve a problem of synchronization in burst transmission communication system such as TDMA, an improved carrier frequency and phase joint estimation scheme has been proposed. Carrier frequency offset estimation, carrier phase offset estimation and symbol timing estimation are achieved in the scheme with the preamble that is utilized for symbol timing estimation in data frame of the traditional burst transmission communication system. The scheme may shorten or completely remove the preamble that is used for carrier frequency estimation in that traditional communication system operating in burst transmission mode, so that the spectrum efficiency of TDMA communication system significantly enhanced. The proposed scheme has been implemented on the FPGA platform, results of which indicate that its maximum operation clock frequency is as high as 70 MHz and the proposed scheme can be used in high speed broadband data transmission system.