Aiming at the problem that the common single antenna transceiver system cannot meet the increasing communication capacity of the existing Internet,a multi antenna technology MIMO (Multiple Input Multiple Output) is presented. Firstly,a 2*2MIMO communication system is built,where the transmitting end includes a QPSK mapping module and an Alamouti encoding module,the channel is a Rayleigh fading channel,and the receiving end includes a maximum ratio combining module;Then,the designed system is simulated by Matlab software;Finally,the error rate performance of the 2*2MIMO system is analyzed through simulation. The simulation results show that the 2*2MIMO system has better symbol error rate performance than the 2*1 system under the same signal-to-noise ratio,which confirms that the 2*2MIMO system can increase channel capacity and improve system reliability.
关键词
2*2MIMO/Alamouti编码/QPSK调制解调/误符号率
Key words
2*2MIMO/Alamouti coding/QPSK modulation and demodulation/symbol error rate
维普
万方数据