摘要
为了提高无线通信系统的抗衰落和抗噪声性能和更有效地利用频率资源,研究了多普勒效应在移动信道中的影响,并分析了STTC-MIMO-OFDM系统在快速移动信道中的性能。采用了空频编码梳状等间隔导频插入方式和完全最大似然空频分组解码算法。由仿真图可知当载波数为256个,插入等间隔导频数为32个时,系统的抗多径能力较强,可满足快速移动的信道环境的要求。
In order to improve the performance of anti- fading and antifading and antinoise, and using frequency re- source effectively,this thesis researches the influence of Doppler effect of the mobile channel,and analyses the performance of STTC - MIMO - OFDM system in the fast - moving environment. Adopting the method of equal - interval pectinate pilot -in- serting and the complete maximum -likelihood space- frequency decoding. According to the simulation results,it has 256 subcarriers and 32 equal - interval - inserting pilots. This algorithm is highly adapt to the fast - moving chanels.
出处
《现代电子技术》
2008年第13期29-30,34,共3页
Modern Electronics Technique
关键词
OFDM
多输入多输出
信道估计
最小均方误差
空时网格编码
空时分组编码
OFDM
multiple - input multiple - output
channel estimation
minimum mean square error
space - time trellis coding
space - time block coding
