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单载波频域均衡(Single Carrier Frequency Domain Equalization,SC-FDE)技术可以有效地消除符号间干扰(ISI),相对于OFDM,具有较低的峰均比(PAPR),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面加入循环前缀(Cyclic-Prefix,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。在取消CP情况下,通过隐训练序列获得信道脉冲响应估计信息,之后利用虚拟补零技术,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 d B后,算法误码率便接近相同信噪比条件下的高斯白噪声信道,性能较为理想。
Single-Carrier Frequency Domain Equalization (SC-FDE) can effectively eliminate intersymbol interference (ISI) and has a lower peak-to-average PAPR than OFDM, making it the key technology for broadband wireless communications one. The traditional SC-FDE system needs to add a Cyclic-Prefix (CP) before the sending frame and the CP length is greater than the maximum multipath delay of the channel, which reduces the bandwidth utilization and increases the transmitter power. In the case of abolishing CP, channel impulse response estimation information is obtained through implicit training sequence. Then, the virtual convolution technique is used to recover the cyclic convolution of the transmitted signal and the channel, and the interference is eliminated by iterative processing. The simulation results show that the BER of the algorithm is close to that of the Gaussian white noise channel under the same signal-to-noise ratio when the signal-to-noise ratio is more than 3 d B, and the performance is better.