摘要
根据分集技术的特点,对以往经典的传输方法进行了改进,提出了一种新的传输方法。在发射端,分成M组天线,每组包含Ti(i=1,2,…,M)根天线,不同组的天线利用不同的频率发射相同的或不同的信息,从而获得发射分集增益和复用增益。在接收端,分成M组天线,每组天线包含Ri(i=1,2,…,M)根天线,每组接收天线负责接收发射端同一组发射天线发射的信息,从而获得接收分集增益,即采用"多对多"的传输方式。仿真结果表明:文中方法与典型的传输方法相比,可大大加快传输速率和接收端的译码的速度。同时,在发射端,可以采用正交极化天线,降低了接收端之间的干扰,从而进一步提高了系统的性能。
The existing transmit method for the system is improved,and a new transmit method for space-time coding is proposed according to the character of frequency diversity and transmit diversity.There are M groups of antennas at the transmitter,each including Ti（i=1,2,…,M） antennas,and every group transmits the same information or different information with different frequencies,so the transmitter diversity gain and the spatial multiplexing could be achieved.And there are M groups of antennas at the receiver,each including Ri（i=1,2,…,M） antennas,and every group receives the information from the same transmit antennas,so the receiver diversity gain could be achieved,which means a transmit method of ＂several to several＂.The simulation results indicate that the method proposed in this paper could greatly improve the data rate and the decoding efficiency as compared with the existing transmit method for the system.In addition,the use of cross polarized antennas could decrease the interruption between receiving antennas,thus further improving the performance of MIMO system.
出处
《通信技术》
2010年第5期58-60,共3页
Communications Technology
关键词
分集技术
最大似然译码
空时码
MIMO
diversity technology
maximum likelihood decoding
space-time coding
MIMO
