TY - GEN

T1 - Differential modulation schemes for cooperative diversity

AU - Woong, Cho

AU - Liuqing, Yang

PY - 2006

Y1 - 2006

N2 - Recent developments of wireless networks show that cooperative diversity can produce multi-input multi-output (M1MO) advantages by forming a virtual antenna array with distributed network nodes. Although differential schemes have long been appreciated in conventional MIMO communications since they provide the benefit of simplicity at the receiver by avoiding channel estimation, their performance and possible benefits in the distributed scenario have not been thoroughly investigated. In this paper, we examine two differential schemes for a cooperative diversity setup using a decode-and-forward relaying protocol. The first scheme (Scheme I) is a direct extension of the conventional differential scheme for a single-input single-output (SISO) channel; whereas the second (Scheme II) is a distributed cooperative counterpart of differential space-time coding (STC). We develop the maximum likelihood (ML) decision rules for two cases, in which the effect of the relay decision is captured by the transition probability. Simulations confirm that both schemes provide full diversity gain. Comparisons of the two schemes show that Scheme I outperforms Scheme II in terms of symbol error rate (SER); while Scheme II can support a higher transmission rate, and this rate advantage increases as the number of relays increases.

AB - Recent developments of wireless networks show that cooperative diversity can produce multi-input multi-output (M1MO) advantages by forming a virtual antenna array with distributed network nodes. Although differential schemes have long been appreciated in conventional MIMO communications since they provide the benefit of simplicity at the receiver by avoiding channel estimation, their performance and possible benefits in the distributed scenario have not been thoroughly investigated. In this paper, we examine two differential schemes for a cooperative diversity setup using a decode-and-forward relaying protocol. The first scheme (Scheme I) is a direct extension of the conventional differential scheme for a single-input single-output (SISO) channel; whereas the second (Scheme II) is a distributed cooperative counterpart of differential space-time coding (STC). We develop the maximum likelihood (ML) decision rules for two cases, in which the effect of the relay decision is captured by the transition probability. Simulations confirm that both schemes provide full diversity gain. Comparisons of the two schemes show that Scheme I outperforms Scheme II in terms of symbol error rate (SER); while Scheme II can support a higher transmission rate, and this rate advantage increases as the number of relays increases.

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M3 - Conference contribution

AN - SCOPUS:34250183861

SN - 1424400651

SN - 9781424400652

T3 - Proceedings of the 2006 IEEE International Conference on Networking, Sensing and Control, ICNSC'06

SP - 813

EP - 818

BT - Proceedings of the 2006 IEEE International Conference on Networking, Sensing and Control, ICNSC'06

T2 - 2006 IEEE International Conference on Networking, Sensing and Control, ICNSC'06

Y2 - 23 April 2006 through 25 April 2006

ER -