“…By oversampling and noise shaping, 1-bit DSM can convert signals of any format, no matter how high the modulation order is, into 1-bit data streams, that is, on-off keying (OOK) signals. Besides avoiding the influence of the saturation effect, DSM can also help improve the signal-tonoise ratio (SNR) as well as reduce the system cost and the complexity of the digital signal processing (DSP) algorithms at the receiver side [27][28][29][30][31] .…”