LDSTBC+OFDM中的一种新的分层方法  

A Novel Grouping Method for LDSTBC+OFDM

作　　者：战金龙[1] 廖桂生[1] 李勇朝[1] 

机构地区：[1]西安电子科技大学雷达信号处理国家重点实验室,西安710071

出　　处：《电子与信息学报》2007年第4期870-874,共5页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(60172028);高等学校博士学科点专项基金(20010701008)资助课题

摘　　要：基于OFDMA(Orthogonal Frequency-Division Multiple Access)中不同用户所分配的子载波不同,提出了频率选择性衰落信道下分层结构的差分空时分组编码LDSTBC(Layered Differential Space-Time BlockCode)的一种新的分层方法。发射端采用分层结构的差分空时分组编码结合OFDM技术,在接收端提出了利用OFDM中子载波选择矩阵进行分组干扰抑制,然后对LDSTBC的每层进行差分空时分组码的传统解码。相对于基于奇异值分解的分组干扰抑制方法,该文提出的方法只需要1根接收天线,降低了系统接收机设计的复杂度。仿真结果验证了所提出的方法的性能优于基于奇异值分解的方法。A novel grouping method is proposed for LDSTBC（Layered Differential Space-Time Block Code） over frequency selective channels, relying on mutual orthogonality between subcarriers of different users in OFDMA（Orthogonal Frequency-Division Multiple Access） systems. At the transmitter, LDSTBC combined with OFDM is applied. At the receiver, the group suppression based on subcarrier selection matrices is used, then the traditional decoding method for DSTBC is used for each layer. Compared with SVD the improved approach only needs one receive antenna so the complexity of the receiver decreases remarkably. Simulation results show that the performance of the improved method is better than the one based on SVD.

关 键 词：OFDM 分层结构差分空时分组编码 空时编码 分组干扰抑制 

分 类 号：TN911.2[电子电信—通信与信息系统]