摘要
采用准正交设计的空时分组码虽然可以达到速率为1,但是牺牲了部分分级增益。广义ABBA(GABBA,Generalized ABBA)空时分组码提出了一种改进型块状迭代准正交分组空时码(QOSTBC,Quasi-orthogonal Space-time Code)编码方式。此编码方式能提供全分集增益,并且满速率传输。克服原有正交分组空时码(OSTBC,Orthogonal Space-time Block Codes)在多天线(天线数大于2)、复信号时不能实现全速率传送的缺点。OFDM调制技术是抗多径效应的有效手段之一,两者相结合的MIMO-OFDM系统很好利用了时间、空间和频率三种分集,使系统达到很高的传输效率和频谱利用率。
Generalized ABBA（GABBA） STBC is an improved QOSTBC,could achieve full diversity gain,and overcome the drawback that it is unable to implement full-rate transmission in the case of multiple antennas（more than 2） and complex signals with OSTBC.OFDM is a very effective means against muti-path effect,and the system could be fairly improved in combination of OFDM and achieve a fairly high transmission efficiency and spectrum efficiency.
出处
《通信技术》
2011年第6期59-61,共3页
Communications Technology
