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基于分级调制的中继协作技术可以很好地利用无线信道的广播特性和中继节点的位置优势来对抗信道衰落。本文提出一种自适应的协作方法,这种方法根据中继的相对位置,选择最优的分级调制星座图以及源与中继之间的功率分配比例,以使目的节点接收的数据误码率最小。仿真结果表明优化星座图和优化源与目的节点之间的功率分配比例都可以获得可观的性能提升。当中继位于源与目的节点的中点附近时,在消耗相同能量带宽资源的条件下,这种最优化的协作方法比非协作系统有3-4dB的性能增益。
Hierarchical modulation based relay coordination technology can make good use of the radio channel’s broadcast characteristics and the relay node’s position advantage to combat channel fading. In this paper, an adaptive cooperative method is proposed. According to the relative position of relays, this method chooses the optimal hierarchical modulation constellation and the power allocation ratio between source and relay so that the data error rate Min. The simulation results show that the optimized constellation and the optimization of the power distribution ratio between the source and the destination node can all obtain considerable performance improvement. When the relay is located near the midpoint of the source node and the destination node, this optimized collaborative method has a performance gain of 3-4 dB over the non-cooperative system under the condition of consuming the same energy bandwidth resources.