A B C D E F G H I J K L M N O P Q R S T U V W X Y Z All
N. S., Khalander Shariff
- Comparison of channel Estimation and Performance of MRC and ZF Receivers in Multicell Multiuser Uplink with Very Large Antenna Arrays
Authors
Source
International Journal of Innovative Research and Development, Vol 3, No 6 (2014), Pagination:Abstract
A multi cell multiuser MIMO system with a very large number of antennas at the base station (BS) is considered. Assumption is that the channel is estimated by using uplink training. In general, we consider a MIMO model Further a physical channel model in which the angular domain is separated into a finite number of distinct directions is considered. We analyze the so-called pilot contamination effect and show that this effect persists under the finite-dimensional channel model that we consider. In particular, a uniform array at the BS is considered. To understand this it is shown 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. This paper investigates if, for a large number of users, simpler schemes can achieve the same performance. Specifically, we show that a zero-forcing beam forming (ZFBF) strategy Further a lower bound on the achievable rate of uplink data transmission with a linear detector at the BS is derived. Then 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 is specialized. Also, we compare the characteristics of the cell channel model and their channel estimates for different Scenario’s.