作为现代通信领域的一个重大突破,MIMO技术能支撑更高的数据传输速率和更好的服务,从而成为下一代无线通信系统的研究热点。通过MIMO系统的建模与仿真,研究比较了在相同信道条件下,不同调制编码方式的输出星座图及系统误码率。仿真结果表明,BPSK的抗噪声性能最好,QAM最差;调制模式相同的前提下,编码速率越高,系统误码率越大。上述结果对今后的工程实践有着良好的参考价值。 As a major breakthrough in the field of modern communication, MIMO technology can support higher data transmission rate and better service, and thus become the research hotspot of the next generation wireless communication system. Through the modeling and simulation of MIMO system, the output constellation and system BER of different modulation and coding schemes under the same channel conditions are studied and compared. Simulation results show that BPSK has the best anti-noise performance and the worst QAM. Under the same modulation mode, the higher the coding rate, the greater the system bit error rate. The above results have a good reference value for future engineering practice.