【摘要】 近年来迭代干扰对齐技术得到了较多的关注,通过迭代干扰对齐算法可设计线性预编码矩阵,以最大化多输入多输出系统的总速率。但目前将自由度(Do F)分配方式作为系统总速率影响因素的研究较少。为此,提出一种Do F分配算法,通过改进模拟退火算法从而得到可使系统总速率达到最大的Do F分配方式。Do F分配问题是组合优化问题,采用模拟退火算法可较好地解决该问题。仿真结果表明,该算法所获得的系统总速率接近遍历算法的性能,具有更低的复杂度。尤其当系统变得复杂(用户数目增加,或者天线数目增加)时,改进模拟退火算法的低复杂度优势更为明显。更多还原

【Abstract】 This paper considers the joint interference alignment and allocation of Degrees of Freedom(Do F)in multiple access K-user Multiple-Input Multiple-Output(MIMO)interference channel to maximize the sum capacity.Because a set of linear precode and corresponding combining matrices can be designed to maximize the sum rate,while joint consideration of sum capacity and distribution of Do F is less addressed. Therefore,this paper proposes an improved Do F allocation algorithm to search ideal Do F allocation which can maximize the sum rate. The essence of Do F allocation is a combinational optimization problem. SA algorithm has notable advantage over this. Simulation results show that the proposed modified SA algorithm achieves sum rate performance near that of the Exhausting search(EX)asymptotically,while the SA has lower computation complexity. Especially,when the system becomes more complicated(increasing user numbers or antennas),the low complexity advantage of SA algorithm is much more notable.更多还原