【作者】 孙治水； 尹长川； 乐光新；

【Author】 Sun Zhishui Yin Changchuan Yue Guangxin (Laboratory of Digital Communications and Information Networks,Beijing University of Posts and Telecommunications,Beijing 100876 China)

【机构】 北京邮电大学数字通信与信息网络实验室；

【摘要】 基于空间分集技术中固有的不同用户间的空间相关性,本文研究了同时使用子载波与空间特性区分用户的方案,即 OFDM-SDMA 多址接入系统。利用反馈信道信息,该方案使用 Gram-Schmidt 正交化方法搜索空间相关系数较小的用户,组成准正交用户组,使组内的用户可以在接受的干扰范围内共享子载波。仿真结果表明,该方案选出的用户组可以有效地共享子载波,从而显著地提高系统的接纳能力和频谱效率。更多还原

【Abstract】 An OFDM-SDMA scheme is studied.Considering the user’s spatial correlation,the subcarrier and spatial signature can be used simultaneously for multiple access.According to the instantaneous channel state information (CSI),the proposed scheme can choose a group of users that are nearly orthogonal to one another by revised Gram-Schmidt process.The simulation results show that the proposed scheme can choose the proper user group so that the same subcarrier can be share efficiently,and can enhance the admittance capacity and improve the system spectrum efficiency.更多还原