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| A CLASS OF CLOCK-CONTROLLED SPREADING SEQUENCES FOR A-CDMA SYSTEMS |
| Rao Nini①; Liu Cong② |
| ①Dept. of Automation UEST of China Chengdu 610054 China;②Sichuan Education Management Information Center Chengdu 610041 China |
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Abstract In this paper, the clock-controlled sequence is presented as a potentially superior spreading code for A-CDMA systems. First, on the basis of an A-CDMA system modei, the relationship between the average bit error probability and the cross-correlation parameters of the PN (Pseudo Noise) sequences is established. The conditions, which the PN sequences as spreading codes should satisfy, are derived from the above relationship. Next, the feasibility of the clock-controlled sequences as the spreading codes for an A-CDMA system are analyzed
systematically. Finally, the cross-correlation functions between m-sequence and clock-controlled
sequence, as well as the average bit error probability (BEP) corresponding to both sequences under various user number, are compared in numerical results. The feasibility of the clock-
controlled sequences as spreading codes is thus verified when U<75.
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Received: 01 January 1900
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2001, Vol. 23 
