Carrier sense random packet CDMA protocol in dual-channel networks

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Radioengineering, ISSN: 1210-2512, Vol: 24, Issue: 2, Page: 507-517

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Chuan Bao Du; Hou De Quan; Pei Zhang Cui; Wei Liang; Po Zhou; Jian Bin Dou
Brno University of Technology
Engineering; Spread-spectrum ad hoc network; full-connected cluster; random packet-code division multiple access; multi-access interference; multiuser detector; Poisson distribution
article description
Code resource wastage is caused by the reason that many hopping frequency (FH) sequences are unused, which occurs under the condition that the number of the actual subnets needed for the tactical network is far smaller than the networking capacity of code division networking. Dual-channel network (DCN), consisting of one single control channel and multiple data channels, can solve the code resource wastage effectively. To improve the anti-jamming capability of the control channel of DCN, code division multiple access (CDMA) technology was introduced, and a carrier sense random packet (CSRP) CDMA protocol based on random packet CDMA (RP-CDMA) was proposed. In CSRP-CDMA, we provide a carrier sensing random packet mechanism and a packet-segment acknowledgement policy. Furthermore, an analytical model was developed to evaluate the performance of CSRP-CDMA networks. In this model, the impacts of multi-access interference from both inter-clusters and intra-clusters were analyzed, and the mathematical expressions of packet transmission success probability, normalized network throughput and signal interference to noise ratio, were also derived. Analytical and simulation results demonstrate that the normalized network throughput of CSRP-CDMA outperforms traditional RP-CDMA by 10%, which can guarantee the resource utilization efficiency of the control channel in DCNs.