Bernhard Etzlinger, Werner Haselmayr, Andreas Springer,
"Equalization Algorithms for MIMO Communication Systems Based on Factor Graphs"
: Proc. of the IEEE International Conference on Communications (ICC 2011), Seite(n) 1-5, 6-2011, ISBN: 978-1-61284-232-5
Equalization Algorithms for MIMO Communication Systems Based on Factor Graphs
Sprache des Titels:
Proc. of the IEEE International Conference on Communications (ICC 2011)
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 in the SPA, it is shown that the resulting equalization algorithms correspond to the optimal MAP equalizer and the low-complexity LMMSE equalizer, respectively. Both algorithms can be used in turbo processing and we demonstrate that after 3 iterations the BER performance of the LMMSE equalizer is similar to that of the MAP equalizer.