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传统的M QAM抗干扰能力较差,若使用减小M的方法提高抗干扰力,又会降低频带利用率,本文提出一种自适应变速率M QAM系统,根据信道情况自动调整M值,并研究了该系统在无线移动瑞利衰落信道中的性能,其频带利用率大于等于3.2b/s/H z,远远高于一般系统的相应指标。
The traditional M QAM has poor anti-interference ability. If the method of reducing M is used to improve the anti-jamming force and the band utilization is also reduced, an adaptive variable rate M QAM system is proposed in this paper. The value of M is automatically adjusted according to the channel conditions. The performance of this system in wireless mobile Rayleigh fading channel is studied. Its bandwidth utilization rate is greater than or equal to 3.2b / s / Hz, which is much higher than that of the general system.