两单播多跳网络的干扰对齐和功率分配方案

Interference Alignment and Power Allocation Algorithm of Two Unicast Multiple Hops Network

针对两单播多跳网络,在存在两个中继端的情况下,研究源端的干扰对齐预编码设计、中继的干扰消除解码和预编码转发设计,以及目的端的干扰消除解码处理.对干扰对齐和解码需满足的约束条件进行分析,给出简化的网络干扰对齐的可行条件.此外,对源端与中继端的功率分配进行优化.最后对干扰对齐的可行性、功率分配的性能进行仿真测试.表明在满足网络对齐约束条件后,干扰对齐可行,并且采用简化迭代注水功率分配算法较采用平均功率分配算法的系统容量有明显提高.

Considering the 2-unicast problem with multiple hops and two relays,research the interference alignment precoding matrixs at the sources,the interference elimination decoding and precoding forward at the relays,and interference cancellation decoding at the destinations are researched. The simplified feasible conditions of network interference alignment were given based on the analysis of constraints of network interference alignment and decoding. In addition,the power allocation of relays and sources are optimized. Simulation tests of the feasibility of interference alignment shows a good performance of the power allocation. And it is shown that interference alignment is feasible if conditions were satisfied,and the system capacity is significantly improved when the simplified water filling power allocation algorithm is used when comparing with the average power allocation algorithm.