Signal-to-Noise Ratios in a PCM/PSK System,

摘要

Output signal-to-noise ratios (SNR's) in a pulse-code-modulation/phase-shift-keying (PCM/PSK) system are calculated. Two-phase,four-phase,and eight-phase PSK systems are considered. The calculated SNR at the demodulator output is expressed as a function of the intrinsic SNR (i.e.,the ratio of signal power to noise power contained in the baseband bandwidth) at the demodulator input and parametric in the number of quantizing levels in PCM. The performance of the PCM/PSK system is compared with those of other typical systems such as single-sideband (SSB) and frequency-modulation (FM) systems.