Analysis of Pilot Contamination in Very Large Scale MIMO Systems
نویسندگان
چکیده
In this thesis, a regular hexagonal geometry with random deployment of users is considered in order to study the impact of pilot contamination for a more general scenario. Specifically, we study a conventional frequency reuse hexagonal geometry and derive the throughput of the network when multiple users are reusing the same pilots leading to pilot contamination problem. We restrict ourselves to only first tier of co-channel interferers. Finally, with the help of numerical simulations, relations among cell throughput, numbers of antennas, number of users per cell, pilot reuse factor and coherence period have been studied. It is shown that the reuse pattern has strong impact on the system achievable throughput.
منابع مشابه
A Variable Structure Observer Based Control Design for a Class of Large scale MIMO Nonlinear Systems
This paper fully discusses how to design an observer based decentralized fuzzy adaptive controller for a class of large scale multivariable non-canonical nonlinear systems with unknown functions of subsystems’ states. On-line tuning mechanisms to adjust both the parameters of the direct adaptive controller and observer that guarantee the ultimately boundedness of both the tracking error and tha...
متن کاملLS-Based Pilot Contamination Pre-coding for Large-scale MIMO System
To reduce pilot contamination, a downlink precoding algorithm was put forward for Large-scale MIMO system. It set the Least Square (LS) criterion to the objective function, and then solved the precoding matrices with the Lagrange multiplier method. In the solving, it utilized not only the estimated channel information but also the pilot contamination information, which was acquired from some bl...
متن کاملPilot Reuse Factor with Large Scale Fading Precoding for Massive MIMO
The fundamental limitation of massive MIMO technology is pilot contamination effect. This effect occurs during uplink training when terminals use the same orthogonal signals. In this paper, a pilot reuse factor with large scale fading precoding is proposed to mitigate the pilot contamination effect. The pilot reuse factor is designed to assign unique orthogonal signals to the adjacent cells. Th...
متن کاملOn the Feasibility of Full-duplex Large-scale MIMO Cellular Systems
This paper concerns the feasibility of full-duplex large-scale multiple-input-multiple-output (MIMO) cellular systems. We first propose a pilot transmission scheme and assess its performance, specifically the ergodic sum-rate. The proposed scheme – the simultaneous pilot transmission (SPT) – enables to reduce pilot overhead, where the pilot overhead depends on the number of antennas at the base...
متن کاملImpact of Angular Spread in Correlated MIMO Channels under Pilot Contamination
Pilot contamination is known to be one of the main bottlenecks for massive multi-input multi-output (MIMO) networks. For moderately large antenna arrays (of importance to recent/emerging deployments) and correlated MIMO, pilot contamination may not be the dominant factor in certain scenarios. To the best of our knowledge, a rigorous characterization of the achievable rates and their explicit de...
متن کامل