PSK Communications Systems using Fully Saturated Power Amplifiers.

Quasi-constant envelope phase-shift keying (PSK) is analyzed to assess its ability to overcome nonlinearities caused by fully saturated RF power amplifiers in communications systems. These modulations can achieve bit error rate (BER) performance comparable to linear BPSK in additive white Gaussian noise (AWGN) channel. Quasi-constant envelope offset quadrature PSK (OQPSK) is presented as a design example. At a BER = 10-5, the SNR degradation caused by fully saturated power amplifiers is 0.1 dB. The simulated BER matches analytically derived results. For a communications system employing the quasi-constant envelope OQPSK and a rate 1/2 convolutional code with K = 7, the demodulation performance is degraded by 0.25 dB at a HER = 10-5 when a fully saturated power amplifier is employed. [ABSTRACT FROM AUTHOR]