Further results on channel overloading using combined TDMA/OCDMA with iterative interference cancellation

We present some new results on a recently introduced multiple access technique which accommodates more than TV users on a channel whose bandwidth is N times the bandwidth of the individual user signals. For K = N + M users, the technique makes use of two sets of orthogonal signal waveforms, one for the first N users and one for the M additional users. Considering a combination of time-division multiple access (TDMA) and orthogonal code-division multiple access (OCDMA), this multiple access scheme is evaluated using quaternary phase-shift keying (QPSK) and 16-state quadrature amplitude (16-QAM) modulations. When used in conjunction with soft iterative interference cancellation (IC), the technique offers substantial overloads.