Radial Basis Function Assisted Reduced Complexity In-phase/Quadrature-phase Turbo Equalisation of Coded Modulation Schemes

A Radial Basis Function (RBF) assisted reduced complexity In-phase/Quadrature-phase (I/Q) Turbo Equalisation (TEQ) scheme is investigated in the context of Trellis Coded Modulation (TCM), Turbo TCM (TTCM), Bit-Interleaved Coded Modulation (BICM) and iteratively decoded BICM (BICM-ID). The proposed schemes are characterised in performance terms, when communicating over frequency selective Rayleigh fading channels. The RBF-I/Q-TEQ-TTCM achieved a similar performance to the full-complexity RBF-TEQ-TTCM, while attaining a complexity reduction factor of 36 in terms of the required additions/subtractions and a factor 9 in terms of the multiplications/divisions necessitated.