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THE STUDY OF A BOCC m-ary spread spectrum SCHEmE

Journal of Electronics(China) 2005年第5期22卷 449-457页

作者： Chu Zhenyong Ying Xiaofan Tian Hongxin Yi Kechu State Key Lab of ISN Xidian University Xi＇an 710071 China

m-ary spread spectrum technique has been found wide applications in wireless communications, but it needs too many orthogonal spreading codes and its despreading/demodulation is quite complex computationally, which limit its wider applications. This paper proposes a novel scheme for Code Division multiple Access (CDmA) communication systems based on m-ary spread spectrum, where only one prototype spreading code is assigned to each user and the codes for different users are orthogonal or quasi-orthogonal with each other. The m spreading codes of each user to represent K bits data are generated by circularly shifting the assigned code and reversing its polarity. The spreading codes generated like that are called as BiOrthogonal Cyclic Codes (BOCCs). At the receiver of the system, a transform domain matched-filter implemented by means of Fast Fourier Transform (FFT) is employed to despread and demodulate the received signals, which has very low computational complexity. The results of simulation experiments and bit-error performance analysis show that the proposed scheme is practical and very useful in many cases.

关键词： m-ary spread spectrum BiOrthogonal Cyclic Codes (BOCCs) Satellite communication Transform domain processing

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