On the performance of ad hoc networks with multiuser detection, rate control and hybrid ARQ
IEEE Transactions on Wireless Communications
A new multiple code channels MAC protocol in DS-CDMA wireless networks
RWS'09 Proceedings of the 4th international conference on Radio and wireless symposium
The capacity of hierarchical wireless networks
WiCOM'09 Proceedings of the 5th International Conference on Wireless communications, networking and mobile computing
Impact of traffic localization on communication rates in ad-hoc networks
Wireless Networks
Adaptive probabilistic medium access in MPR-capable ad-hoc wireless networks
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
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Random packet CDMA, a novel packet-based multiple access scheme for connectionless, uncoordinated random channel access is proposed. Random packet CDMA, or RP-CDMA, utilizes a novel packet format which consists of a short header and a data portion. Each header is spread with a unique spreading code which is identical for all users and packets, while the data portion of each packet is spread by a randomly chosen spreading sequence. The receiver operates in two stages: header detection and data detection. For header detection a conventional spread spectrum receiver is sufficient. Headers are spread with a large enough processing gain to allow detection even in severe interference. The data portion is decoded with a sophisticated receiver, such as a multiuser detector, which allows for successful decoding of overlapping active packets. It is shown that the RP-CDMA system is detector capability limited and that it can significantly outperform spread ALOHA systems whose performance is limited by the channel collision mechanism. RP-CDMA also experiences a much smaller packet retransmission rate than conventional or spread ALOHA, and provides better spectral efficiencies