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DS-CDMA for uplink low data rate transmission in multibeam satellite communications: radio capacity perfromance

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3 Author(s)
Y. L. Xu ; Dept. of ECE, McGill Univ., Montreal, Que., Canada ; J. Weng ; T. Le-Ngoc

This paper presents a performance evaluation of various spreading codes applied to DS-CDMA for uplink low data rate transmission in multibeam, variable-rate, and quasisynchronous satellite communication over a LOS channel. The simulation results indicate that both PP-Gold/Long and Walsh/Long codes provide the best performance. If the timing offset for the two-level spreading scheme is smaller than a determined limit, there is no capacity loss as compared to the perfect synchronous case. Furthermore, a code reuse scheme is also given to improve the radio capacity of the system, but it requires more precise synchronization. In general, the performance of a CDMA-based satellite system is mainly limited by the interbeam interference.

Published in:

Electrical and Computer Engineering, 2003. IEEE CCECE 2003. Canadian Conference on  (Volume:3 )

Date of Conference:

4-7 May 2003