关键词: 协作, 分簇, 凸优化, 跨层, 公平性

Abstract:

To achieve diversity gain and reduce algorithm complexity, cooperative diversity is employed to cluster MB-OFDM (Multiband orthogonal Frequency Division Multiplexing) UWB systems, in which cluster is the minimum granularity of resource allocation. Improved TFC(Time-Frequency Coded) model is proposed. We propose a cluster allocation and planar recursion power allocation algorithm based on convex optimal theory for the purpose of maximum system capacity under the overall power limitation. To reduce the complexity of algorithm, a quick crosslayer allocation algorithm judged by the relative requirement of cluster is further introduced. Simulation results show that this algorithm can satisfy usersQoS requirement,achieve a good tradeoff between system throughput and the fairness. 

Key words: cooperative, cluser, convex optimal, cross-layer, fairness