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The turbo detection of a coded under-determined multiple-input multiple-output (UD-MIMO) system is studied in this paper. A UD-MIMO system with transmit antennas and receive antennas has more unknowns than the observations. However, most existing low complexity detectors, such as the vertical Bell Laboratories Layered Space-Time (V-BLAST) or the block decision feedback equalizer (BDFE),...
In this paper, we consider a bit-interleaved coded spatial multiplexing MIMO communication system over a frequency-selective MIMO channel. We present a factor-graph-based derivation of two different equalization algorithms. To this end, we propose a cycle-free factor graph representation of the equalizer, to which we apply the sum-product algorithm (SPA). By using different message representations...
An adaptive subband chip-equalizer is investigated for downlink multiple-input multiple-output (MIMO) direct-sequence (DS) ultra-wideband (UWB) systems to cope with the inter-symbol interference (ISI) and the multiple-access interference (MAI) in multipath fading channels. The subband decomposition technique is employed to improve substantially the downlink reception of mobile-terminal receivers without...
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