正交循环码M进制扩频接收机的研究

褚振勇; 应小凡; 易克初; 田红心

正交循环码M进制扩频接收机的研究

褚振勇^{①②;应小凡},
应小凡,
易克初,
田红心

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出版历程
- 收稿日期: 2004-04-27
- 修回日期: 2004-11-17
- 刊出日期: 2005-11-19

An M-ary Spread Spectrum Receiver Based on Orthogonal Cyclic Codes

摘要

摘要: 该文提出了一种基于正交循环码的M进制扩频接收机方案，发端将一条原型扩频码循环移位构成M个扩频码，实现M进制扩频，接收端利用时频变换域正交匹配滤波器实现了非相干解扩解调。该方案不仅减少了需要的扩频码数目，而且有效地降低了接收机的计算复杂度。该文对所提出的系统在单用户和多用户条件下的误码性能进行了理论分析和仿真，并比较了3种M进制解扩方法的运算量。结果表明：正交循环码M进制扩频系统的计算复杂度和误码特性均优于传统的M进制系统。
- M进制扩频;正交循环码;短时傅里叶变换;变换域处理
Abstract: This paper proposes a novel M-ary spread spectrum receiver scheme based on time-frequency transform domain. At the transmitter of the system, the M spreading codes of each user are generated by circularly shifting the prototype spreading code. At the receiver, a time-frequency transform domain orthogonal matched-filter is employed to noncoherently despread and demodulate the received signals. The proposed scheme reduces computation and spreading codes selection difficulty of M-ary spread spectrum system remarkably. The BER performances of the receiver for single user and multiuser are analyzed, and the computations for three kinds of M-ary despreading methods are compared. The results show that the proposed scheme has better BER performance and lower computation complexity than of traditional M-ary systems.

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参考文献(1)

Enge Per K, Sarwate Dilip V. Spread-spectrum multiple access performance of orthogonal codes: linear receivers [J]. IEEE. Trans. on Communications, 1987, COM-35(12): 1309-1319.[2]Volz P U, Magaa M E, Speidel J. A new block interleaver and noniterative decision feedback decoding enhance performance of IS-95 CDMA uplink or similar M-ary system [J].IEEE Trans. on Vehicular Technology.2002, 51(4):690-[3]Lee Jhong Sam, Miller L E. CDMA Systems Engineering Handbook [M]. Boston, MA, USA: Artech House Publishers, Oct. 1998, Chapter 7.[4]阮永红, 祁玉生. DS-CDMA系统正交码调制的抗多址干扰性能及其改进 [J], 通信学报, 1999, 20(8): 86-90.[5]Miller S L. An efficient channel coding scheme for direct sequence CDMA systems [A], IEEE Military Communications Conference [C], McLean, Virginia: Nov. 1991, Vol. 3: 1249-1253.[6]Yang Lie-Liang, Hanzo L. Performance analysis of coded M-ary orthogonal signaling using errors-and-erasures decoding over frequency-selective fading channels [J].IEEE J. on Selected Areas in Communications.2001, 19(2):211-221[7]Vincent K N Lau, Svetislav V Maric. Variable rate adaptive modulation for DS-CDMA [J].IEEE Trans. on Communications.1999, 47(4):577-589[8]Louay M A Jalloul, Jack M Holtzman. Performance analysis of DS/CDMA with noncoherent M-ary orthogonal modulation in multipath fading channels [J].IEEE J. on Selected Areas in Communications.1994, 12(5):862-870[9]孙文江, 张轶凡等. 卷积编码正交序列扩频多码CDMA系统在Nakagami衰落信道的性能 [J]. 电子学报, 1999, 27(6): 100-103.[10]Bernard Sklar. Digital Communications Fundaments and Applications (Second Edition) [M]. Upper Saddle River, NJ, USA: Prentice Hall Inc., Jan. 2001, Chapter 4.

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