Iterative ICI cancellation based on factor graphs for large FFT sizes

Paper i proceeding, 2011

This paper focuses on the challenging problem of signal reception for orthogonal frequency division (OFDM) systems in high mobility environments. A novel framework based on the well-known belief propagation (BP) algorithm is pro- posed for joint inter-carrier interference (ICI) cancellation, signal detection and channel decoding. The performance of the mentioned near-optimal detection strategy is analyzed over a general bit-interleaved coded modulation (BICM) system applying low-density parity-check (LDPC) codes. The inclusion of pilot symbols is also considered to analyze how they assist the detection process. A full parallel turbo receptor is derived which shows good performance when the ICI power is high due to high mobility or the use of large FFT sizes.