【作者】 徐娜； 钟晓玲； 孙怡；

【Author】 XUNa ZHONG Xiao-ling SUN Yi (School of Electronics and Information Engineering,Dalian University of Technology,Dalian 116024,China)

【机构】 大连理工大学电子与信息工程学院；

【摘要】 在MIMO系统中,混合空时编码方案使用一部分天线发射全分集的码字(如STBC),其余天线发射空间复用码字(如VBLAST),以使MIMO系统同时获得分集增益和复用增益。但是空间复用码字没有分集增益,抗衰落性能较差。本文提出一种自适应混合MIMO方案,用完美空时分组码代替空间复用码字。完美空时分组码具有满分集增益和满速率,可以在不损失频谱效率的前提下提高系统可靠性。同时,根据反馈信息,该方案自适应调整分配给各发射天线的码字,提高系统整体性能。更多还原

【Abstract】 In MIMO systems,hybrid space-time coded scheme applies some of the transmit antennas with pure diversity schemes(e.g.STBC) while others with pure spatial multiplexing schemes(e.g.VBLAST), in order to achieve the diversity gain and multiplexing gain at the same time.However,the spatial multiplexing schemes without diversity gain are susceptible to the fading effect.In this paper,we propose an adaptive hybrid space-time coded scheme using the Perfect STBC instead of spatial multiplexing schemes.Since the Perfect STBC obtains the full diversity gain and full rate,it can increase the reliability without loss of efficiency.Meanwhile,according to the feedback from the receiver,this scheme adaptively adjusts the allocation of transmit antennas to improve the performance of the system.更多还原