MQAM (Multiple Quadrature Amplitude Modulation) 多进制正交幅度调制。4相相位键控信号其实也是一种二电平正交振幅键控。如果将二电平振幅键控进一步发展为多电平(例如4、8、16电平等)正交振幅键控，显然可以获得更高的频谱利用率。
MQAM-TCM has been widely used in high rate OFDM design.
在高速率的OFDM设计中，MQAM-TCM调制已被广泛采用。
The influences of timing offset and carrier phase offset on the performances of MPAM and MQAM are analyzed.
文中分析了同步偏差即定时偏差和载波恢复相差对MPAM和MQAM接收性能的影响。
For MQAM modulation, the optimized bit loading and power allocation were derived from a various-step greedy algorithm.
针对MQAM调制，采用变步长的贪婪算法得到优化的子信道比特加载及功率分配方案。
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