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SumRate Analysis for Centralized and Distributed Antenna Systems with Spatial Correlation and InterCell Interference
Ou ZHAO Hidekazu MURATA
Publication
IEICE TRANSACTIONS on Communications
Vol.E98B
No.3
pp.449455 Publication Date: 2015/03/01 Online ISSN: 17451345
DOI: 10.1587/transcom.E98.B.449 Type of Manuscript: PAPER Category: Wireless Communication Technologies Keyword: distributed antenna systems, spatial correlation, spatially correlated shadowing, correlated multipath fading, intercell interference, ergodic sumrate, zeroforcing beamforming,
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Summary:
In order to verify the channel sumrate improvement by multiuser multipleinput multipleoutput (MUMIMO) transmission in distributed antenna systems (DASs), we investigate and compare the characteristics of channel sumrates in both centralized antenna systems (CASs) and DASs under the effects of path loss, spatially correlated shadowing, correlated multipath fading, and intercell interference. In this paper, we introduce two different types of functions to model the shadowing, autocorrelation and crosscorrelation, and a typical exponential decay function to model the multipath fading correlation. Thus, we obtain the distribution of the channel sumrate and investigate its characteristics. Computer simulation results indicate that DAS can improve the performance of the channel sumrate compared to CAS, even in the case under consideration. However, this improvement decreases as interference power increases. Moreover, the decrease in the channel sumrate due to the increase in the interference power becomes slow under the effect of shadowing correlation. In addition, some other analyses on the shadowing correlation that occurs on both the transmit and receiver sides are provided. These analysis results show that the average channel sumrate in a DAS without intercell interference considerably decreases because of the shadowing correlation. In contrast, there appears to be no change in the CAS. Furthermore, there are two different types of sumrate changes in a DAS because of the difference in shadowing autocorrelation and crosscorrelation.


