为了提高插入了保护间隔的无线通信系统的传输带宽利用效率,提出了一种可以用作时域信道估计的特殊保护间隔实现方式.所提出的保护间隔信号由已知可变符号序列构成,通过插入此种特殊的保护间隔,接收机可以实现低复杂度的时域信道估计,从而节省了原本传输导频信号的带宽,也因此提高了系统的带宽利用率.为了在新的系统中继续使用单抽头的频域均衡器,还给出了一种循环卷积恢复的方法用于重建信号和信道之间的循环卷积关系.仿真结果证明,该方案能取得良好的性能. In order to improve the utilization efficiency of transmission bandwidth of wireless communication systems with guard interval inserted, a special guard interval implementation method which can be used as time-domain channel estimation is proposed. The proposed guard interval signal consists of a known variable symbol sequence, Insert such a special guard interval, the receiver can achieve low complexity time-domain channel estimation, thus saving the bandwidth of the original transmission pilot signal, and thus improve the system bandwidth utilization. In order to continue to use the new system One-tap frequency-domain equalizer also gives a method of cyclic convolution recovery, which is used to reconstruct the circular convolution relationship between signal and channel.The simulation results show that this scheme can achieve good performance.