【摘要】 本文首先分析了自适应MQAM调制的原理,它以频谱效率最高为准则,在恒定功率约束条件下对接收信噪比优化来选择不同调制阶数。然后引入时变多径信道模型,通过仿真给出了自适应QAM在此信道条件下的性能,并分析了信道估计误差对其性能的影响。更多还原

【Abstract】 The principle of adaptive MQAM is analyzed firstly, it adopts different modulation level according to different signal noise power ratio, and subject to maximize the spectral efficiency. The performance of adaptive QAM is studied on the assumption that the channel model is time varying multi-path, and the effects of channel estimation errors in adaptive QAM system are given.更多还原