基于单载波频域均衡的多径合并算法

为了提高传统单载波频域均衡(SC-FDE)算法的检测性能,将RAKE接收合并技术应用到非扩频的单载波传输系统。通过SC-FDE得到对发送信号的估计,并基于该初始检测结果和信道状态信息构建通过信道各条路径的多径信号,再根据干扰抵消(IC)原理,依次从接收信号中减去所构建的其他几径信号,得到其中各多径分量,最后将各多径分量在频域合并后再变换回时域进行解调判决。在3种不同的信道模型下进行了Monte Carlo仿真实验,SC-FDE分别采用迫零(ZF)和最小均方误差(MMSE)算法,RAKE接收合并算法分别采用选择性、等增益和最大比合并,实验结果表明,3种合并算法中,最大比合并取得的检测性能最优。

Muitipath combining scheme based on single-carrier frequency domain equalizations

To improve the performance of conventional Single-Carrier Frequency Domain Equalizations (SC-FDE), PAKE receiver is introduced to the non-spread-spectrum SC transmission system. First, the initial estimate of the transmitted data is obtained by SC-FDE; then all the multipath signals can be constructed by this initial solution and channel state information. Using interference cancellation technique, each multipath component in the received signal can be acquired by canceling the sum of all other constructed multipath signals. Finally, the components are combined together in frequency-domain before demodulation in time-domain. Monte Carlo simulations are carried out in three different channels and SC-PDE adopts Zero Forcing (ZF) and Minimum Mean Square Error (MMSE) algorithm separately. Simulation results show that among Selection Combining (SC), Equal Gain Combing (EGC) and Maximal Ratio Combing (MRC) techniques, MRC achieves the best performance.