MIMO-pipe模型下基于干扰对齐的链路调度算法  

Interference Alignment Based Link Scheduling Algorithm under MIMO-pipe Model

作　　者：熊最[1] 王可人[1] 金虎[1] 

机构地区：[1]电子工程学院,合肥230037

出　　处：《信号处理》2015年第5期621-629,共9页Journal of Signal Processing

摘　　要：尽管干扰对齐(Interference Alignment,IA)能从信息论的角度提升系统的频谱利用率,但其在链路调度方面的性能发挥仍然受到干扰模型的限制。与常用的协议干扰模型、物理干扰模型相比,MIMO-pipe模型更能够反映MIMO链路分集增益与复用增益的折中关系。因此,为了研究IA对MIMO-pipe模型下链路调度性能的影响,本文在现有MIMO-pipe模型的基础上,进一步推导了IA条件下的等效MIMO-pipe模型,给出了干扰对齐条件下每条MIMO链路对应的可行传输速率与信干噪比需求之间的折衷关系集,并提出了一种基于IA等效MIMO-pipe模型的分布式算法。理论分析和仿真结果表明,等效MIMO-pipe模型能较好的反映出IA的特点。同时,在吞吐量略有降低的条件下,基于该IA等效模型的链路调度算法所需的调度时隙数明显少于未采用IA的链路调度算法。Although interference alignment（ IA） is capable of enhancing the spectrum utility from the aspect of information theory,its performance adopted in link scheduling was limited by interference model. Compared with the commonly used interference model such as protocol interference model and physical interference model,the newly proposed‘MIMO-pipe＇model was developed to describe the tradeoff between multiplexing gain and diversity gain in MIMO communication systems.For the purpose of considering the effect of IA on the performance of link scheduling with MIMO-pipe model,the equivalent form of MIMO-pipe model under the IA circumstance was derived. A set of pairs between feasible transmission rate and the requirement of signal to interference and noise ratio（ SINR） for each MIMO link was extracted,and a link scheduling optimization problem was formulated. In order to solve such an optimization problem,a novel distributed algorithm based on the equivalent model was proposed. The theoretic analysis and simulation results demonstrate that the equivalent MIMO-pipe model was propitious to reveal the characteristic of IA. What＇s more,the total number of scheduling time slots obtained by the distributed link scheduling algorithm with IA is obviously less than that without IA while the throughput decreases a little.

关 键 词：链路调度 物理干扰模型 干扰对齐 MIMO网络 

分 类 号：TN914[电子电信—通信与信息系统]