期刊文献+

基于LDPC码的单载波频域均衡系统

SC-FDE System Based On LDPC Codes
下载PDF
导出
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。 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.
出处 《电子与信息学报》 EI CSCD 北大核心 2008年第4期817-821,共5页 Journal of Electronics & Information Technology
关键词 单载波系统 LDPC码 频域均衡 判决-反馈均衡 循环前缀 Single carrier system Low-Density Parity-Check (LDPC) codes Frequency Domain Equalization (FDE) Decision Feedback Equalization (DFE) Cyclic Prefix (CP)
  • 相关文献

参考文献11

  • 1Falconer D, Ariyavisitakul S L, and Benyamin-Seeyar A, et al.Frequency domain equalization for single-carrier broadband wireless systems. IEEE Commun. Mag., 2002, 33(4): 58-66. 被引量:1
  • 2Falconer D and Ariyavisitakul S L. Broadband wireless using single carrier and frequency domain equalization. The 5th International Symposium on Wireless Personal Multimedia Communications, Honolulu, Hawaii, 2002, 1: 27-36. 被引量:1
  • 3Falconer D, Ariyavisitakul S L, and Benyaminn-Seeyar A, et al.. White paper: Frequency domain equalization for single-carrier broadband wireless systems, http://www.sce.carleton.ca/bbw/ papers/Ariyavisit akul. pdf. 被引量:1
  • 4Gallager R G. Low-density parity-check codes. IRE Trans on Inform Theory, 1962, 8(1): 21-28. 被引量:1
  • 5Sari H, Karam G, and Jeanclaude I. Transmission techniques for digital terrestrial TV broadcasting. IEEE Commun. Mag., 1995, 33(2): 100-109. 被引量:1
  • 6Qureshi S U H. Adaptive equalization. Proc. IEEE, 1985, 73(9): 1349-1387. 被引量:1
  • 7贺玉成,杨莉,慕建君,王新梅.LDPC码的不可检测译码错误分析[J].通信学报,2002,23(1):1-7. 被引量:6
  • 8Frank R L and Zadoff S A. Phase shift pulse codes with good periodic correlation properties. IEEE Trans. Info. Theory, 1961, 7(4): 254-257. 被引量:1
  • 9Chu D C. Polyphase codes with good periodic correlation properties. IEEE Trans. Info. Theory, 1972, 18(4): 531-532. 被引量:1
  • 10A fast and accurate degree distribution optimizer for ldpc code ensembles, http://lthcwww.epfl.ch/research/ldpcopt/. 被引量:1

二级参考文献6

  • 1[1]Gallager R G. Low density parity check codes [J]. IRE Trans on IT, 1962, 8(1): 21-28. 被引量:1
  • 2[2]Mackay D. Good error-correcting codes based on very sparse matrices [J]. IEEE Trans on IT, 1999, 45(2): 399-431. 被引量:1
  • 3[3]McEliece R J, Mackay D, Cheng J F. Turbo decoding as an instance of pearl's belief propagation algorithm [J]. IEEE J SAC, 1998, 16(2): 140-152. 被引量:1
  • 4[4]Davey M, MacKay D. Low density parity check codes over GF(q) [J]. IEEE Communications Letters, 1998, 2(6): 165-167. 被引量:1
  • 5[5]Richardson T, Urbanke R. The capacity of low-density parity check codes under message-passing decoding [J]. IEEE Trans on IT, 2001, 47(2): 599-618. 被引量:1
  • 6[6]Lin S, Costello D J. Error Control Coding: Fundamentals and Applications [M]. Englewood Cliffs, NJ: Prentice-Hall, 1983. 被引量:1

共引文献5

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部