Performance evaluation of adaptive bit interleaved coded modulation in OFDM with various fading channels

Abstract: Bit-interleaved coded modulation (BICM) is a flexible modulation/coding scheme which allows the designer to choose a modulation constellation independently of the coding rate. This is because the output of the channel encoder and the input to the modulator are separated by a bit-level interleaver. In order to increase spectral efficiency, BICM can be combined with high-order modulation schemes such as quadrature amplitude modulation (QAM) or phase shift keying techniques. BICM is particularly well suited for fading channels, and it only introduces a small penalty in terms of channel capacity when compared to the coded modulation capacity for both additive white Gaussian noise and fading channels. In this paper an adaptive BICM technique is proposed and modelled with one of the modulation schemes in OFDM and verified with various channel models. The results pertaining to these studies are mentioned. It is evident that the proposed ABICM is validated for the channel models.

Keywords: Bit-interleaved coded modulation (BICM), OFDM, QAM.