Coded modulation using differential encoding over Rayleigh fading channels

Abstract

Multilevel coding and bit-interleaved coded modulation using differential encoding and non-coherent reception over flat fading channels are assessed. In order to achieve high bandwidth efficiencies differential encoding is done with respect to phase, as well as with respect to amplitude of APSK constellations. Assuming the channel to be slowly time-varying, encoding and detection are based on blocks of N consecutive symbols (multiple symbol detection). In this paper, we provide the code design and present simulation results. It is shown that only for multilevel coding multiple symbol detection provides significant gains.

Serial concatenation of quadratic interleaved codes in different wireless doppler environments

“…Message bits are first FEC-encoded by the SCQIC encoder (which will be detailed in section III), and afterwards, inserted into differential encoder. In spite of higher required ‫ܧ‬ /ܰ when differential coding (DC) is employed for attaining the same error-rate, we utilize DC before forming the signal constellations for pre-compensating the common phase errors of wireless communications (discussed in [20][21]). Afterwards, differentially encoded bit sequences are modulated by M = 8 DPSK modulator.…”

Joint space-time algebraically-interleaved turbo-like Coded Incoherent MIMO systems with optimal and suboptimal MAP probability decoders

“…Hence, phase ambiguity is likely to be present in the received signal due to imperfect knowledge of the carrier's phase and fading effects. These phase errors can be pre-compensated by DC at the transmitter and incoherent detection at the receiver [39][40]. DC is computationally-simple technique widely used to enable non-coherent detection, when the carrier phase acquisition and the tracking are impossible /unreliable, or prohibitively complex due to successive phase noise, commonly happened in cases where noise and errors of local oscillators are considerable [41].…”