The multicell multiuser mimo uplink with very large antenna arrays and a finite dimensional channel
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1) The document considers multicell multiuser MIMO systems with a very large number of antennas at the base station. It analyzes the "pilot contamination effect" discovered in previous work under a finite-dimensional channel model. 2) It shows that the pilot contamination effect persists under the finite-dimensional channel model, which separates the angular domain into a finite number of distinct directions. 3) For a uniform array at the base station, it demonstrates that when the number of BS antennas goes to infinity, the system performance under the finite-dimensional channel model is the same as under an uncorrelated channel model with the same number of angular bins.
The multicell multiuser mimo uplink with very large antenna arrays and a finite dimensional channel
- 1. 2020 – 2021 #13/ 19, 1st Floor, Municipal Colony, Kangayanellore Road, Gandhi Nagar, Vellore – 6. Off: 0416-2247353 Mo: +91 9500218218 / +91 8220150373 Website: www.shakastech.com, Email - id: shakastech@gmail.com, info@shakastech.com The Multicell Multiuser MIMO Uplink with Very Large Antenna Arrays and a Finite-Dimensional Channel Abstract: We consider multicell multiuser MIMO systems with a very large number of antennas at the base station (BS). We assume that the channel is estimated by using uplink training. We further consider a physical channel model where the angular domain is separated into a finite number of distinct directions. We analyze the so-called pilot contamination effect discovered in previous work, and show that this effect persists under the finite-dimensional channel model that we consider. In particular, we consider a uniform array at the BS. For this scenario, we show that when the number of BS antennas goes to infinity, the system performance under a finite-dimensional channel model with P angular bins is the same as the performance under an uncorrelated channel model with P antennas. We further derive a lower bound on the achievable rate of uplink data transmission with a linear detector at the BS. We then specialize this lower bound to the cases of maximum-ratio combining (MRC) and zero-forcing (ZF) receivers, for a finite and an infinite number of BS antennas. Numerical results corroborate our analysis and show a comparison between the performances of MRC and ZF in terms of sum-rate.