Coverage Analysis of Multi-Stream MIMO HetNets with MRC Receivers

Khoshkholgh, Mohammad G. and Navaie, Keivan and Shin, Kang G. and C. M. Leung, Victor (2017) Coverage Analysis of Multi-Stream MIMO HetNets with MRC Receivers. IEEE Transactions on Wireless Communications, 16 (12). pp. 7816-7833. ISSN 1536-1276

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Most of current research on the coverage performance of multi-stream MIMO heterogeneous networks (HetNets) has been focusing on a single data-stream. This does not always provide accurate results as our analysis shows the cross-stream correlation due to interference can greatly affect the coverage performance. This paper analyzes the coverage probability in such systems, and studies the impact of cross-stream correlation. Specifically, we focus on the max-SIR cell association policy, and leverage stochastic geometry to study scenarios whereby a receiver is considered in the coverage, if all of its data-streams are successfully decodeable. Assuming open-loop maximum ratio combining (MRC) at receivers, we consider cases where partial channel state information is available at the receiver. We then obtain an upper-bound on the coverage and formulate crossstream SIR correlation. We further show that approximating such systems based on fully-correlated (non-correlated) datastreams, results in a slight underestimation (substantial overestimation) of the coverage performance. Our results provide insights on the multiplexing regimes where densification improves the coverage performance and spectral efficiency. We also compare MRC with more complex zero-forcing receiver and provide quantitative insights on the design trade-offs. Our analysis is validated via extensive simulations.

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Journal Article
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IEEE Transactions on Wireless Communications
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14 Sep 2017 07:54
Last Modified:
09 Jan 2024 00:20