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单载波频域均衡(SC-FDE)技术可以有效消除符号间干扰(ISI),相对于正交频分复用(OFDM),具有较低的峰均比,因此成为宽带无线通信关键技术之一。传统的SC-FDE系统需要在发送帧前加入循环前缀(CP),且CP长度要大于信道最大多径时延,这就降低了频带利用率,使得发射机功率增加。本文在取消CP情况下,提出一种辅助补零算法,恢复发送信号和信道的循环卷积,并通过迭代处理消除干扰。仿真结果表明,在信噪比大于3 dB后,所提算法误码率更接近相同信噪比条件下的高斯白噪声信道,性能也较为理想。
Single-carrier frequency-domain equalization (SC-FDE) can effectively eliminate intersymbol interference (ISI) and has a lower peak-to-average ratio than Orthogonal Frequency Division Multiplexing (OFDM), making it one of the key technologies for broadband wireless communications . The traditional SC-FDE system needs to add a cyclic prefix (CP) before the sending frame and the CP length is larger than the maximum multipath delay of the channel, which reduces the bandwidth utilization and increases the transmitter power. In this paper, under the circumstance of eliminating CP, an auxiliary zero-padding algorithm is proposed to recover the cyclic convolution of the transmitted signal and the channel, and to eliminate the interference by iterative processing. The simulation results show that the BER of the proposed algorithm is closer to the Gaussian white noise channel under the same signal-to-noise ratio, and the performance is also better after the SNR is greater than 3 dB.