摘要
MIMO和OFDM2种技术相结合不但可以通过多载波并行传输实现很高的数据传输速率,还可以通过空时编码(STBC)/空频编码(SFBC)/空时频编码(STFBC)实现分集增益。采用2发1收的MISO-OFDM系统,对STBC/SFBC/STFBC在不同的频率/时间选择性信道环境下进行了性能仿真比较。仿真结果表明,STFBC-OFDM在平坦快衰落信道环境下,表现出与SFBC-OFDM同样的最优性能,在频率选择性衰落信道下,表现出与STBC-OFDM同样的最优性能,但在平坦性慢衰落信道中表现出最差性能。因此,可以根据信道的不同特性选择最适合的空时频编码,使系统得到最理想的性能。
The combination of multiple-input multiple-output （MIMO） and OFDM can realize high data transmission rate by multi - carrier transmission, and achieves diversity gain by TBC/SFBC/STFBC. A comparison of STBC, SFBC and STFBC has been conducted under the different frequency/time selective fading channel by using two by one MISO-OFDM system. Simulation results show that STFBC-OFDM has the best performance alike the SFBC-OFDM under the fast -fiat fading and has the best performance alike the STBC-OFDM under the frequency selective fading environment. However, it shows the worst performance in the flat-slow fading. Thus, it can choose the proper time/frequency coding scheme according to different channel characteristics.
出处
《重庆邮电大学学报（自然科学版）》
2008年第6期650-653,共4页
Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)
关键词
空时编码
空频编码
空时频编码
MISO—OFDM
时间/频率选择性衰落
space-time block code （STBC）
space-frequency block code （SFBC）
space-time-frequency block code（STFBC）
MISO-OFDM
time/frequency selective fading
