Near-Capacity Turbo Coded Soft-decision Aided
Dandan Liang, Student Member, IEEE, Soon Xin Ng, Senior Member, IEEE, and Lajos Hanzo, Fellow, IEEE
Communications Research Group, University of Southampton, SO17 1BJ, U.K.
Abstract-- Low-complexity non-coherently detected Differential
Amplitude and Phase-Shift Keying (DAPSK) schemes constitute
an ideal candidate for wireless communications. In this paper,
we derive the soft-output probability formulas required for the
soft-decision based demodulation of DAPSK, which are then
invoked for Turbo Coded (TC) transmissions. Furthermore, the
achievable throughput characteristics of the family of M-ary
DAPSK schemes are provided. It is shown that the proposed 4-
ring based TC assisted 64-ary DAPSK scheme achieves a coding
gain of about 4.2 dBs in comparison to the identical-throughput
TC assisted 64-ary Differential Phase-Shift Keying (64-DPSK)
scheme at a bit error ratio of 10-5.
Index Terms-- Soft-decision, Iterative detection, DAPSK, TC,
Correlated Rayleigh fading channel, Near-capacity transceivers.