摘要： 多跳信道的中断性能较差，且节点接收设备上的多跳分集信道较为复杂。为此，基于解码转发多跳信道和多跳分集信道，提出一种改进的解码转发多跳中继系统，解决上述2种信道性能和复杂度的矛盾。推导中断概率的计算公式，以最小化系统中断概率为目标，利用拉格朗日乘子优化各节点的功率分配。仿真结果表明，改进系统能获得比传统多跳中继系统更低的中断概率，最优功率分配方案下系统的中断性能优于均匀功率分配方案，并且性能优势随跳数增加更为明显。
关键词:
解码转发,
中继,
多跳,
中断概率,
信噪比,
功率分配
Abstract: In view of the inferior outage performance of multihop channel and the complex receiver of multihop diversity channel, an improved Decode-and-forward(DF) multihop relay system is proposed based on DF multihop relay system and DF multihop diversity relay system. The proposed system can realize a tradeoff between system performance and complexity. Outage probability of the proposed system is derived, and power allocation optimization problem is formulated and evaluated by minimizing the outage probability with the use of lagrange multiplier method. Simulation results show that the proposed system has better outage performance than traditional multihop relay systems. Besides, the optimum power allocation can enhance system performance, especially if the number of relays is large.
Key words:
Decode-and-forward(DF),
relay,
multihop,
outage probability,
Signal Noise Ratio(SNR),
power allocation
中图分类号:
杨洁, 芮雄丽, 曹雪虹. 改进的解码转发多跳中继系统及最优功率分配[J]. 计算机工程, 2013, 39(3): 82-86.
YANG Ji, RUI Xiong-Li, CAO Xue-Gong. Improved Decode-and-forward Multihop Relay System and Optimal Power Allocation[J]. Computer Engineering, 2013, 39(3): 82-86.