Expectation Propagation Detection for High-Order High-Dimensional MIMO Systems Articles uri icon

publication date

  • August 2014

start page

  • 2840

end page

  • 2849

issue

  • 8

volume

  • 62

international standard serial number (ISSN)

  • 0090-6778

electronic international standard serial number (EISSN)

  • 1558-0857

abstract

  • Modern communications systems use multiple-input multiple-output (MIMO) and high-order QAM constellations for maximizing spectral efficiency. However, as the number of antennas and the order of the constellation grow, the design of efficient and low-complexity MIMO receivers possesses big technical challenges. For example, symbol detection can no longer rely on maximum likelihood detection or sphere-decoding methods, as their complexity increases exponentially with the number of transmitters/receivers. In this paper, we propose a low-complexity high-accuracy MIMO symbol detector based on the Expectation Propagation (EP) algorithm. EP allows approximating iteratively at polynomial-time the posterior distribution of the transmitted symbols. We also show that our EP MIMO detector outperforms classic and state-of-The-Art solutions reducing the symbol error rate at a reduced computational complexity.

keywords

  • high-dimensional mimo communication systems ; high-order qam; low complexity ; expectation propagation