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为了提高协作分集系统的信道容量,该文在多中继节点协作背景下提出了基于注水算法的中继节点功率分配方案。首先,对空时矩阵的列序号提出了一种新的映射方案,该方案能够提升中继节点发射信号间的正交性。对于采用线性正交解码算法的GABBA码,列序号重新排布后能够降低误码率。然后,通过对接收信噪比与中继节点发射功率的分析,针对信道容量最大化问题提出了一种应用注水算法的两步求解方案。该文对瑞利平坦慢衰落信道下采用GABBA码的协作分集系统进行仿真,仿真结果表明,与中继节点发射功率均分方案相比,该文提出的功率分配方案能够提升系统抗误码性能,达到满分集增益t rN′N。该文提出的方案在不同的仿真条件下对信道容量均有提升,并且信道容量与2min{t,r}logN N′M成正比。
In order to improve the channel capacity of cooperative diversity system, this paper proposes a scheme of relay node power allocation based on water flooding algorithm in the context of multi-relay node cooperation. First, a new mapping scheme is proposed for the column numbers of space-time matrixes. This scheme can improve the orthogonality between signals transmitted by relay nodes. For a GABBA code that uses a linear orthogonal decoding algorithm, rearranging the column numbers can reduce the bit error rate. Then, by analyzing the received signal-to-noise ratio and the transmit power of the relay node, a two-step solution to the problem of channel capacity maximization is proposed. This paper simulates the cooperative diversity system with GABBA codes over Rayleigh flat slowly-fading channels. The simulation results show that the power allocation scheme proposed in this paper can improve the performance of the system against error codes compared with the transmit power equalization scheme of relay nodes , Reach full diversity gain t rN’N. The proposed scheme improves the channel capacity under different simulation conditions, and the channel capacity is proportional to 2min {t, r} logN N’M.