| By using OFDM, a block fading channel model is derived. Based on this model, this paper is focused on coded modulation, transmit diversity, multipath diversity and their combination. In detail, they are bit-interleaved coded modulation (with iterative decoding), Low-Density Parity-Check codes and STF technology. By the performance analysis of BICM (-ID), which can make code and modulation optimal separately, and achieve maximum possible coding diversity as well as modulation gain, guidelines for its design and an easy algorithm for SISO are proposed. Design of capacity-approaching of LDPC codes and efficient encoding of them as well as several kinds of its decoding algorithms are investigated. At the same time, to achieve space, time and frequency diversity, some research is done on STF technology, which joints transmit diversity and OFDM technology.
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