THE PERFORMANCE OF PHASE LOCKED TRANSPARENT TONE-IN-BAND WITH SYMMETRICAL PHASE DETECTION

Transparent tone-in-band (TTIB) creates a spectral gap by splitting a signal into frequency bands, which are then separated by modulation. The receiver recombines the bands by demodulation, a process which must be coherent in the case of data transmission. Phase locked transparent-tone-in-band (PLTTIB), in its original form, contained an unacceptably high level of self-noise in the coherent band recombination process. Recently, a symmetric form of the PLTTIB phase detector has been demonstrated to eliminate self-noise, though no analysis of its locking behavior has been available. This paper provides the first performance analysis of PLTTIB with symmetric phase detection, and contains several new results, including the effect of recombination phase error on BER, the mean square phase error, the probability density function of phase error, and the pull-in time of the phase tracker. Although the detailed results are obtained only for static channels, a qualitative assessment of the effect of fading is given.