ANALYSIS OF METHODS USING FOR SUPERRESOLUTION OF THE SIGNALS IN THE TASKS OF SPACE-TIME ACCESS

Mykola Moskalets,Svitlana Teplytska

doi:10.21303/2461-4262.2016.00154

Mykola Moskalets, Svitlana Teplytska

Open Access

https://doi.org/10.21303/2461-4262.2016.00154

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Abstract

Six methods are considered in the analysis of the methods of angular superresolution of the signals: non-adaptive beamforming, Kapon, thermal noise, Bordzhotti-Lagunas, maximal entropy and multiple signal classification (MUSIC). The comparative characteristic of the methods with assessing their advantages disadvantages and limitations is given. Theoretical resolution of these methods is assessed in the article. Numerical evaluation of resolution ability of the methods of angular superresolution of the signal are obtained based on the simulation of various scenarios of signal-to-noise ratio, taking into account the use of correlated and uncorrelated signals, a different number of antenna elements and the values of the signal / interference + noise ratio. These estimations show the ultimate theoretical accuracy of the methods and the potential for their use in problems of space-time access with set limits. The simulation results confirmed the statistical consistency of these methods of estimation of arrival direction angles of correlated and uncorrelated signals from subscriber stations for the space-time sampling in the output of the linear equidistant antenna array. The present analysis and research results make it possible to select the most effective method for determining the arrival of signals in accordance with the given parameters of signal-to-noise ratio under restrictions.

Highlights

In the world and in Ukraine, there is shortage of using the frequency, time and code resources and there is a necessary for additional physical resources, implementing more efficient use of radio frequency resources, increase of network bandwidth and increase of the productivity of mobile communication system as a whole [1,2,3]
multiple signal classification (MUSIC) and MEM methods provide a maximum capacity of arrival of signals from consideration areas. (Fig. 1, b) The resolution of the methods is significantly increased with the increase of signal/(noise+interference) ratio (SNR) up to 20 dB except Bordzhotti-Lagunas and classical NAB methods
Analysis of the simulation results of resolution estimation of the arrival angles of the signals from 4 sources of radiation is shown: 1. Classic non-adaptive beamforming method is the easiest in the practice, it has a major disadvantage associated with the restriction of the Rayleigh resolution [9]

Summary

Introduction

In the world and in Ukraine, there is shortage of using the frequency, time and code resources and there is a necessary for additional physical resources, implementing more efficient use of radio frequency resources, increase of network bandwidth and increase of the productivity of mobile communication system as a whole [1,2,3]. In this aspect, the use of promising methods space-time access (STA) methods in a mobile communication system is prospective [4]. This problem is solved on the basis of different methods: using an equisignal zone direction finding, estimations of AA directional characteristics, with the Rayleigh resolution, with superresolution (SR), etc. that have their performance [5, 6]

Methods

Results

Conclusion