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Contention resolution in random-access wireless networks based on orthogonal complementary codes

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1 Author(s)
Xiaohua Li ; Dept. of Electr. & Comput. Eng., State Univ. of New York, Binghamton, NY, USA

This paper proposes a new method for contention resolution in random-access wireless networks. Using orthogonal complementary codes to design access-request packets, users can reserve channel access successfully, even in severe contentions. Collisions among access-request packets can be resolved and exploited, whereas collisions among data packets are avoided. System throughput and delay performance can be enhanced, because random-access contention becomes transparent. Specifically, system throughput approaches the offered load up to the maximum value one with improved average packet delay performance. A joint layer design approach is proposed with both the physical layer signal-detection algorithm and the medium access-control layer random-access protocol. The performance is analyzed with the consideration of signal detection errors. Simulations are performed to demonstrate its superior performance.

Published in:

IEEE Transactions on Communications  (Volume:52 ,  Issue: 1 )