Resource allocation for cooperative diversity systems based on quadrature modulation |
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| Authors: | Jing Li Jianhua Ge Yong Wang Ming Gao |
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| Affiliation: | 1. State Key Lab of Integrated Service Networks, Xidian University, Xi'an 710071, P. R. China
2. State Key Lab of Integrated Service Networks, Xidian University, Xi'an 710071, P. R. China;State Key Lab of Rail Traffic Control and Safety, Beijing Jiaotong University, Beijing 100044, P. R. China |
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| Abstract: | To improve the error performance and the resource utilization of cooperative systems, the optimum resource allocation, i.e., power allocation and partner choice, for an adaptive decode-and-forward (DF) cooperative diversity system based on quadrature modulation is investigated. The closed-form expression of the bit error rate (BER) system performance is derived and an optimal power allocation (OPA) algorithm is proposed to optimize the power allocation between the local and relayed signals under the minimum BFI criterion. Based on the OPA algorithm, a partner choice strategy is proposed to determine the partner locations specified by various cooperation gains. Simulation results show that the proposed resource optimization algorithms are superior to the unoptimized algorithms by significantly reducing the BER and improving the cooperative gain, which is useful to simplify the practical partner choice process. |
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| Keywords: | wireless communication cooperative diversity bit error rate (BER) resource allocation |
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