Science & Engineering Research Support soCiety (SERSC)
In this paper, a practical multi-packet reception technique is proposed for wireless ad-hoc networks in which concurrent transmissions generally occur. In practical systems, these transmissions are performed without pre-compensation of time and frequency offsets before transmission due to decentralized nature of ad hoc networks. The authors first derive an Optimal Asynchronous Joint Detection (OAJD) technique for concurrent transmissions by considering time and frequency offsets among the multiple received packets. Furthermore, they propose a Suboptimal Asynchronous Joint Detection (SAJD) technique with log-likelihood ratio by utilizing the fact that practical pulse-shaping filters including raised cosine filter fall down beyond the number of symbol times.