TY - GEN
T1 - Optimum energy allocation in cooperative networks
T2 - Military Communications Conference, MILCOM 2007
AU - Cho, Woong
AU - Cao, Rui
AU - Yang, Liuqing
PY - 2007
Y1 - 2007
N2 - Cooperative networks enjoy spatial diversity gains by forming virtual antenna arrays. To improve the performance of such cooperative networks, optimum energy (power) allocation has emerged as an important research topic. In our previous work, we have investigated the decode-and-forward (DF) protocol. In this paper, the more challenging amplify-and-forward (AF) scenario is considered. Differential modulation which bypasses channel estimation is adopted to reduce receiver complexity and communication overhead. For the AF relay system with and without a direct link between the source node and destination node, we first derive simple and general expressions of the average symbol error rate (SER), at reasonably high SNR. Based on these, the optimum energy distributions which minimize the average SER are obtained. The advantages of the energy optimization are confirmed by analysis and simulations. Using these results, we compare the systems with and without a direct link as well as systems with different relaying protocols.
AB - Cooperative networks enjoy spatial diversity gains by forming virtual antenna arrays. To improve the performance of such cooperative networks, optimum energy (power) allocation has emerged as an important research topic. In our previous work, we have investigated the decode-and-forward (DF) protocol. In this paper, the more challenging amplify-and-forward (AF) scenario is considered. Differential modulation which bypasses channel estimation is adopted to reduce receiver complexity and communication overhead. For the AF relay system with and without a direct link between the source node and destination node, we first derive simple and general expressions of the average symbol error rate (SER), at reasonably high SNR. Based on these, the optimum energy distributions which minimize the average SER are obtained. The advantages of the energy optimization are confirmed by analysis and simulations. Using these results, we compare the systems with and without a direct link as well as systems with different relaying protocols.
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U2 - 10.1109/MILCOM.2007.4454924
DO - 10.1109/MILCOM.2007.4454924
M3 - Conference contribution
AN - SCOPUS:47949113747
SN - 1424415136
SN - 9781424415137
T3 - Proceedings - IEEE Military Communications Conference MILCOM
BT - Military Communications Conference, MILCOM 2007
Y2 - 29 October 2007 through 31 October 2007
ER -