Experimental implementation of four-level heterodyne video systems using 4-ary FSK (frequency shift keying) are described and compared to DQPSK (differential quadrature phase-shift keying). The results show that the receiver sensitivity and complexity of the two systems are very similar. However, DQPSK provides a much higher spectral efficiency and is therefore preferable for video distribution systems.>
No takes yet. Share an insight, caveat, or question.
Enning et al. (1992) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: