Trellis Coding of Quadrature Frequency/Phase Modulated Signals

In this paper, we explore the trellis coding of continuous phase QFPM (CPQFPM) signal sets and continuous phase FPM (CPFPM) signal sets, which are embodiments of the quadrature biorthogonal modulation (QBOM) technique. Conventional TCM and multiple TCM schemes with these modulation formats are examined using both the AWGN channel and the Rician fading channel design. Asymptotic coding ains in schemes, in comparison with uncoded modulations (8AMPM, 32AMPM) and other trellis-coded modulations [TCM (2FSK/ 4PSK, 16QAM, 64QAM), MTCM (ZFSKIIPSK)] of equivalent throughput rate. Performance gains on the Rician fading channel are demonstrated by increased values of the design parameters for this channel, namely symbol diversity L,,, and branch distance product P . d'(free) are tabulated for trellis-coded rate i, :, and 7 P QFPM