Differential Turbo Coded Modulation over Unsynchronized Channels

S. Howard, C. Schlegel, L. Pérez, and F. Jiang (USA)


differential turbo coded modulation, channel estimation


A simple serially concatenated turbo code using differen tial 8PSK modulation as the inner code and a [3,2,2] parity code as the outer code is studied. This inner code allows for noncoherent operation, but is decoded coherently accord ing to turbo principles with iterative exchange of extrinsic probabilities. Results show a turbo cliff at 4.4 dB, about 1.5 dB away from the 8PSK channel capacity. Detection of these codes on channels without prior synchronization is demonstrated to be feasible even with significant phase offset.

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