一种无循环前缀迭代单载波频域均衡算法

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3dB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。

An iterative Single Carrier Frequency Domain Equalizer algorithm without Cyclic Prefix

Single Carrier Frequency Domain Equalization（SC-FDE） technology can alleviate Inter-Symbol Interference（ISI） effectively in lower Peak to Average Power Ratio（PAPR） than that of Orthogonal Frequency Division Muhiplexing（OFDM）, which is a promising technique in wideband wireless communications. However, conventional SC-FDE is required to have enough Cyclic Prefix（CP） to compensate multipath effectively, which will lower the bandwidth efficiency and increase the transmitter power requirement. In this paper, an auxiliary zero-padding algorithm is proposed to restore the cyclic convolution of channel matrix, and mitigate the interferences for SC-FDE without CP by iteration, thereby avoiding the spectral and power overheads. Simulation results demonstrate the proposed algorithm can achieve a similar bit error rate as Additive White Gaussian Noise（AWGN） channel under the same signal to noise ratio when signal to noise ratio is above 3 dB.