【摘要】 该文设计了一种联合判决-反馈均衡的单载波频域均衡(SC-FDE)系统,该系统用固定波形的短pn序列取代常规SC-FDE系统中的循环前缀(CP),并以多个短pn序列组成的长PN序列作信道训练从而解决快变信道的初始估计和跟踪问题。针对该系统,一种在时域内对接收的多个训练序列进行平均,然后提出了在频域对信道信息进行估计的信道训练算法,该算法与传统SC-FDE系统相比,其计算复杂度较低。另外,提出了一种增加纵向校验的LDPC码用于该系统中降低信噪比门限,提高系统的整体性能。仿真结果表明在多径衰落信道中,此系统可获得较为理想的结果。更多还原

【Abstract】 This paper introduces a single-carrier system with hybrid time-frequency domain Decision Feedback Equalization (DFE),in which the short pn (Pseudo-Noise) sequence with fixed waveform replaces the cyclic prefix (CP) in the conventional Single Carrier systems with Frequency Domain Equalization (SC-FDE),and the long PN sequences composed of several short pn sequences are employed as the channel training sequences to complete the initial estimation and tracking for fast-varying channel.In this system,the received training sequences are averaged in time domain and then the channel is estimated in frequency domain.In comparison with traditional SC-FDE systems,its complexity is lower.Furthermore,an approach of adding sum-check blocks to original Low-Density Parity-Check (LDPC) blocks is presented,and the effective improvements of this system performance can be achieved.Finally,the simulation results show that this system works well over the fading channel.更多还原