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：多天线面向带内移频键控是一种新型连续相位频移键控，特别适用于链路预算紧张的多天线通信场景。该方法将调频的恒定包络特性与低速率重复编码相结合，从而免除了发射波束成形的需求。尽管属于频率调制方式，其发射信号的频谱形状却接近矩形。与GSM的高斯最小移频键控类似，当结合差分预编码时，该信号可很好地近似为线性调制。这使得通过加窗快速傅里叶变换实现便捷的相干解调成为可能。