一种新的带有预编码的GLSTBC-OFDM技术

提出了OFDMA(Orthogonal Frequency-Division Multiple Access)系统中线性预编码(Linear Constellation Precoding,LCP)和分组的分层空时结构GLSTBC(Group Layered Space-Time Block Code,GLSTBC)结合的一种新的发射机方案,即LCP-GLSTBC-OFDM.该发射机结构基于3级用户码的设计:外码(基于OFDMA)主要用来进行组间干扰抑制;中间级的码(基于空时编码STBC)获得空间分集增益,内码(基于LCP)用来获得频率分集增益.文中所提出的方法在接收端只需要一根接收天线就可以消除组间干扰,同时还可以获得2阶空间分集增益、2阶复用增益和满频率分集增益,而且编码和译码的过程都是基于线性处理的,计算简单.计算机仿真结果也证明了该方法的有效性.

GLSTBC-OFDM with Linear Constellation Precoding over Frequency-Selective Fading Channels

Relying on mutual orthogonality between subcarriers of different users in Orthogonal Frequency-Division Multiple Access (OFDMA) systems and exploiting both Linear Constellation Precoding (LCP) and Group layered space-time block code (GLSTBC), a novel LCP-GLSTBC-OFDM transmitter diversity technique is proposed for wireless communications over frequency-selective fading channels. The proposed approach is based on a three-level design of user codes: the top level (based on OFDMA) deals with group interference and intersymbol interference (ISI), the middle level (based on STBC) results in space diversity, and the lower level (based on LCP) results in frequency diversity. The proposed design only needs one receive antenna to suppress the group interference and can obtain half space diversity gain , half multiplexing gain and full frequency diversity gain simultaneously. The performance merits of this design are verified by simulations.