Multi-antenna towards inband shift keying is a new continuous phase frequency shift keying that is particularly suited for multi-antenna communications when the link budget is critical. It combines the constant envelope of frequency modulation with low-rate repetition coding in order to make transmit beamforming dispensable. Although it is a frequency modulation, its transmit signal shows close to rectangular spectral shape. Similar to GSM's Gaussian minimum shift keying, it can be well approximated by linear modulation, when combined with differential precoding. This allows for easy coherent demodulation by means of a windowed fast Fourier transform.

翻译：多天线面向带内移位键控是一种新型连续相位频移键控，特别适用于链路预算受限的多天线通信场景。该方法将恒包络调频特性与低速率重复编码相结合，从而无需使用发射波束成形。尽管这是一种频率调制方式，但其发射信号频谱形状接近矩形。与GSM的高斯最小移位键控类似，当结合差分预编码时，该调制方式可通过线性调制进行良好近似。这使得利用加窗快速傅里叶变换实现简易相干解调成为可能。