一种低发射功率的单载波频域均衡结构

摘要

单载波频域均衡技术可实现同正交频分复用多载波传输技术等效的抗多径衰落性能及较低的处理复杂度,具有较低的峰均比,因此成为下一代移动通信中非常有前景的传输技术.但是传统的单载波频域均衡系统发射机需要在每一帧信号前插入循环前缀.提出了一种优化的单载波频域均衡结构,仅在发射机偶数帧前面插入循环前缀,因此可以提高发射机的频谱效率,节约了发射功率.在接收端,当检测偶数帧信号时,利用传统的频域均衡技术进行检测;提出了两种检测奇数帧信号的频域均衡接收机,分别为基于重叠保留法和重叠相加法的频域均衡接收机.仿真结果证明基于重叠保留法的频域均衡接收机可以取得与传统单载波频域均衡系统相近的误符号率性能.%Single-carrier frequency domain equalization (SC-FDE) systems, which offer comparable complexity and performance to orthogonal frequency division multiplexing (OFDM) systems with a lower peak-to-average power ratio (PAPR), is a promising technique in future generation of wireless communications. An improved SC-FDE system is proposed, in which the cyclic prefix (CP) is only inserted in front of even frames so that the proposed SC-FDE systems can enjoy higher power efficiency as well as save the sent power of the transmitter, compared to conventional SC-FDE systems. In the receiver, the even frames are detected using the conventional FDE technique while two approaches named overlap-save (OLS) FDE and overlap-add (OLA) FDE are proposed to detect the odd frames. Simulation results show that the proposed OLS FDE receiver can achieve the same symbol error rate (SER) as the conventional SC-FDE system.