Dual-Branch MRC Receivers in the Cellular Downlink under Spatial Interference Correlation

Konferenz: European Wireless 2014 - 20th European Wireless Conference
14.05.2014 - 16.05.2014 in Barcelona, Spain

Tagungsband: European Wireless 2014

Seiten: 6Sprache: EnglischTyp: PDF

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Tanbourgi, Ralph; Jondral, Friedrich K. (Karlsruhe Institute of Technology (KIT), Germany)
Dhillon, Harpreet S. (Department of Electrical Engineering, University of Southern California, Los Angeles, CA, USA)
Andrews, Jeffrey G. (The University of Texas, Austin, TX, USA)

Although maximal-ratio combining (MRC) has become a widespread diversity-combining technique, its performance under interference is still not very well understood. Since the interference received at each antenna originates from the same set of interferers, but partially de-correlates over the fading channel, it exhibits a complicated correlation structure across antennas. Using tools from stochastic geometry, this work develops a realistic analysis capturing the interference correlation effects for dual-branch MRC receivers in a downlink cellular system. Modeling the base station locations by a Poisson point process, the probability of a typical dual-branch MRC receiver being covered by its serving base station is derived. For the interference-limited case, this result can be further simplified to an easy-to-use single-integral expression. Using this result, it is shown that ignoring interference correlation overestimates the true performance by 3%–10%, while assuming identical interference levels across antennas underestimates it by <2%. In both cases, however, the true diversity order of dual-branch MRC is preserved. Finally, the performance of MRC and selection combining under spatial interference correlation is compared.