AG Kommunikationstheorie


Low Complexity Joint Channel Estimation and Decoding for LDPC Coded MIMO-OFDM Systems


In this work, a joint iterative channel estimation and low-density parity-check (LDPC) decoding algorithm based on factor graphs and the sum-product algorithm is proposed for orthogonal frequency division multiplexing (OFDM) systems employing multiple transmit and receive antennas (MIMO). By modeling time-varying frequency-selective fading channels as autoregressive (AR) processes and approximating messages as Gaussian pdf, this receiver algorithm is able to maintain a low complexity. Moreover, with the help of strong channel coding and careful pilot allocation, pilot overhead can be significantly reduced.

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