Frequency-hopping trellis-coded 8-DPSK for indoor communications

A TDMA (time-division multiple-access) slow frequency hopping-trellis-coded 8-DPSK (differential phase-shift keying) scheme is proposed for indoor mobile radio communications. In order to assess the performance of this scheme, a GWSSUS (Gaussian wide-sense stationary uncorrelated scattering) continuous channel model with an exponential power delay profile has been adopted. This channel model allows one to analyze transmission rates much lower than the inverse of the RMS (root mean square) delay spread. Bit error rate (BER) is obtained, through Monte Carlo computer simulation, as a function of signal-to-noise ratio and with normalized frequency-hopping separation and number of hopping-frequency channels as parameters. It is found that the degradation of the system BER performance with respect to the null-correlation case is, for normalized frequency-hopping separations greater than 0.15, hardly significant.<
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