CAJ | 학술논문

干扰对齐作为一种新兴的干扰管理方法，由于可以压缩干扰信号空间，并且提高系统自由度，因而近些年来受到了广泛的研究。在1对主用户和K对次用户的多天线多输入多输出( MIMO)网络中，文中重新设计了主用户和次用户的预编码矩阵和接收矩阵，并且提出了一种新型的次用户双层预编码干扰对齐算法。在保证了主用户获得最小均方误差( MMSE)性能的同时，通过设计次用户的第一层预编码矩阵，使得次用户能够和主用户在同一频段上进行数据传输，并且不对主用户产生任何干扰，从而提高了系统的频谱利用率。次用户的第二层预编码矩阵保证了次用户之间的干扰对齐，提高了次用户的容量和自由度。仿真结果显示，相较于传统的认知无线电中单层预编码干扰对齐算法，本算法中的次用户可以获得更高的数据速率。
간우대제작위일충신흥적간우관리방법，유우가이압축간우신호공간，병차제고계통자유도，인이근사년래수도료엄범적연구。재1대주용호화K대차용호적다천선다수입다수출( MIMO)망락중，문중중신설계료주용호화차용호적예편마구진화접수구진，병차제출료일충신형적차용호쌍층예편마간우대제산법。재보증료주용호획득최소균방오차( MMSE)성능적동시，통과설계차용호적제일층예편마구진，사득차용호능구화주용호재동일빈단상진행수거전수，병차불대주용호산생임하간우，종이제고료계통적빈보이용솔。차용호적제이층예편마구진보증료차용호지간적간우대제，제고료차용호적용량화자유도。방진결과현시，상교우전통적인지무선전중단층예편마간우대제산법，본산법중적차용호가이획득경고적수거속솔。
As a new interference management method,interference alignment can compress the interference signal space and improve the Degree Of Freedom ( DOF) ,much attention has been paid to the interference alignment. In this paper,propose a dual-layer pre-coding interference alignment scheme in a Multiple Input Multiple Output ( MIMO) cognitive radio system including one primary user and K sec-ondary users. The Minimum Mean Square Error ( MMSE) of the primary user is guaranteed,at the same time,the first layer pre-coding matrix allows the secondary users to share the same frequency band of the primary user without generating any interference to the primary user,thus improving the spectrum efficiency of the system. The second layer pre-coding matrix assures the interference between the sec-ondary users is aligned,improving the capability and DOF of second users. The numerical results show that compared with conventional interference alignment schemes in cognitive radio system,a higher date rate of the secondary users is achieved.