Multiple carrier frequency offset compensation for cooperative HAPS IoT systems

Yanyan Zhang,Xing Li,Baocong Wang,Wenjuan Ji,Xin Li,Na Liu

doi:10.1186/s13638-020-01758-6

Abstract

Due to the deployment flexibility and broad coverage capabilities, High Altitude Platform Station is an efficiency solution of communication access for underserved areas like remote areas. However, for some special scenarios, multiple platforms may need to collaborate to overcome the effects of terrain. But the interferences introduced by multiple carriers and access links may hinder the process and restrict its practicability. In order to eliminate these interferences, a proposal on multiple carrier frequency offsets (MCFO) compensation algorithm was provided in this paper. Furthermore, this paper analyzed the lower bound of bit error ratio (BER) for cooperative HAPS systems. Simulation was also carried out, and the results validate the correctness of our theoretical analysis results.

Highlights

Due to the lack of telecommunications infrastructure and high density of trees and peaks, the signal coverage of rural and remote areas are restricted
We propose a new frequency offset compensation algorithm for High Altitude Platform Station (HAPS) Internet of Things (IoT) systems employing space-frequency block code orthogonal frequency division multiplexing (SFBC-Orthogonal frequency division multiplexing (OFDM)), which can provide nearly the ideal performance under certain conditions
3.1 bit error ratio (BER) analysis results 3.1.1 BER derivation of cooperative communication systems It is assumed that each sub-carrier is modulated by M-ary phase shift keying (PSK) with Gray bit mapping

Summary

Introduction

Due to the lack of telecommunications infrastructure and high density of trees and peaks, the signal coverage of rural and remote areas are restricted. These areas occupy an important position in the development of the country especially in Internet of Things (IoT) [1]. The network should cover a wide range by employing huge number of base stations, and it will raise the network cost significantly In this case, special telecommunication technologies are required in rural and remote areas [2], especially because of their unique isolation environment, few population, large terrain, and inability to make productive investments [3]. Various telecommunication methods have been proposed for rural areas where these services are lacking, efforts are needed to achieve Internet and cellular access [4]

Methods

Results

Conclusion