Whatever happened to . . .? A review of previous advanced modulation methods

Over the past two decades, many new methods of modulating a signal with digital signals have been proposed. The author reviews some of these methods: sinusoidal MSK; multi-amplitude MSK; Ungerboeck coded modulation; multi-h coded modulation; tamed frequency modulation; CPM; quadrature overlapped raised-cosine modulation; cross correlated PSK; correlative PSK; and digital phase modulation. >