BICM with OFDM System

Caire, Taricco and Biglieri presented a detailed analysis of bit interleaved coded modulation, a simple and popular technique used to improve system performance, especially in the context of fading channels. This paper deals with transmission schemes for BICM-OFDM system. In low-mobility scenarios the channel state can be accurately tracked by both the transmitter and the receiver and the performance can be improved adapting the signalling to the instantaneous channel spectral shape. In the BICM-OFDM scheme, nearly optimal performance can be achieved by bit loading and power allocation, i.e. assigning a different constellation (number of bits) and different power to each subcarrier and each channel access according to the channel frequency response.