1,174 research outputs found
Multi-Cell Massive MIMO in LoS
We consider a multi-cell Massive MIMO system in a line-of-sight (LoS)
propagation environment, for which each user is served by one base station,
with no cooperation among the base stations. Each base station knows the
channel between its service antennas and its users, and uses these channels for
precoding and decoding. Under these assumptions we derive explicit downlink and
uplink effective SINR formulas for maximum-ratio (MR) processing and
zero-forcing (ZF) processing. We also derive formulas for power control to meet
pre-determined SINR targets. A numerical example demonstrating the usage of the
derived formulas is provided.Comment: IEEE Global Communications Conference (GLOBECOM) 201
Impact of User Mobility on Optimal Linear Receivers in Cellular Networks
We consider the uplink of non-cooperative multi-cellular systems deploying
multiple antenna elements at the base stations (BS), covering both the cases of
conventional and very large number of antennas. Given the inevitable pilot
contamination and an arbitrary path-loss for each link, we address the impact
of time variation of the channel due to the relative movement between users and
BS antennas, which limits system's performance even if the number antennas is
increased, as shown. In particular, we propose an optimal linear receiver (OLR)
maximizing the received signal-to-interference-plus-noise (SINR). Closed-form
lower and upper bounds are derived as well as the deterministic equivalent of
the OLR is obtained. Numerical results reveal the outperformance of the
proposed OLR against known linear receivers, mostly in environments with high
interference and certain user mobility, as well as that massive MIMO is
preferable even in time-varying channel conditions.Comment: 3 figures, 6 pages, accepted in ICC 201
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