A Theoretical Answer to "Does the IRC-SINR of an Interference Rejection Combiner always Increase with an Increase in Number of Receive Antennas?"

02/08/2021
by   Karthik Muralidhar, et al.
0

Interference rejection combiners (IRCs) are very popular in 4G/5G systems. In particular, they are often times used in co-ordinated multi-point (CoMP) networks where the antennas of a neighboring cell's base station (BS) are used in an IRC receiver, in conjunction with the antennas of the BS of a cell-edge UE's own cell, to improve the IRC-SINR of a cell-edge user. But does the IRC-SINR always increase with an increase in the number of antennas? In this paper, we attempt to answer the question theoretically. We give a theoretical derivation that quantifies the improvement in the IRC-SINR when the number of antennas increases by unity. We show that this improvement in IRC-SINR is always greater than or equal to zero. Thus we prove that increasing the number of antennas even by unity will always improve the IRC-SINR. Selecting the extra antennas of the neighbouring cell can be viewed as a special case of antenna selection described in [1]. We also present the IRC-SINR improvement in an uplink CoMP scenario by simulations and verify that it indeed matches with the theoretical gains derived in this paper.

READ FULL TEXT

page 1

page 2

page 3

page 4

research
02/10/2020

Area Spectral Efficiency and SINR Scaling Laws in Multi-Antenna Cellular Networks

We study the scaling laws of the signal-to-interference-plus-noise ratio...
research
08/22/2018

Optimizing the MIMO Cellular Downlink: Multiplexing, Diversity, or Interference Nulling?

A base-station (BS) equipped with multiple antennas can use its spatial ...
research
07/28/2018

Point Process Models for Distribution of Cell Phone Antennas

We introduce a model for the spatial distribution of cell phone antennas...
research
10/22/2017

Coexistence Gaps in Space: Cross-Technology Interference-Nulling for Improving LTE-U/WiFi Coexistence

To avoid the foreseeable spectrum crunch, LTE operators have started to ...
research
01/14/2020

Scaling Laws of Dense Multi-Antenna Cellular Networks

We study the scaling laws of the signal-to-interference-plus-noise ratio...
research
05/21/2020

Escaping the Densification Plateau in Cellular Networks Through mmWave Beamforming

We study how dense multi-antenna millimeter wave (mmWave) cellular netwo...
research
07/11/2023

Optimization of Rate-Splitting Multiple Access in Beyond Diagonal RIS-assisted URLLC Systems

This paper proposes a general optimization framework for rate splitting ...

Please sign up or login with your details

Forgot password? Click here to reset