Design and FPGA Implementation of Signal Strength Measurement Techniques for Satellite Communication Systems

Author:

Sharma Satish,Prasad K.R. Yogesh

Abstract

Communication receivers perform three major functions, frequency down conversion, IF demodulation and subcarrier demodulation. The functioning of a receiver is mainly controlled by input signal strength and relative dynamics. Signal strength is measured in terms of Signal to Noise ratio (SNR) and Carrier to Noise power density (C/No). Any measure of signal strength indirectly gives information about receiver performance for that period. Apart from this, SNR measurement in close loop with Phase Locked Loop (PLL) parameter forms the adaptive PLL system, which is one of the driving forces for this paper. The focus of this paper is to find suitable signal strength measurement techniques and their implementation for satellite communication systems. Signal to Noise Variance method (SNV) and Narrow band Wide band Power Ratio (NWPR) methods are considered based on the performance and realization aspects. All techniques require division, logarithm, and multiplication functions for their realization in hardware. CO-ordinate Rotation Digital Computer (CORDIC) algorithm is considered for realizing logarithm function. A comparison study is done for developed algorithm with Intellectual Property (IP) core. Developed SNR techniques are simulated for Binary Phase Shift Keying (BPSK) demodulator system and performance is evaluated for Additive White Gaussian Noise (AWGN). The paper describes the FPGA design and simulations of these techniques. Developed design is targeted to commercial and space qualified FPGA platforms. FPGA implementations results are compared with system level simulation results, and both are found to be satisfactory. Application of developed system in adaptive BPSK demodulator is also presented.

Publisher

The Aeronautical Society of India

Reference24 articles.

1. Spilker, J.J., Digital Communication by Satellite, Belmont CA, Prientice Hall Inc, 1977.

2. Ulrich L. Rohde., "Digital PLL Frequency Synthesizer : Theory and Design", Printice Hall Inc ,1983.

3. Behzad Razavi., "A Study of Phase Noise in CMOS Oscillators", IEEE Journal of Solid-State Circuits, Vol.31, No.3, March 1996, pp.331-343.

4. Peter Heymann and Matthias Rudolph., "Phase Noise in A Guide to Noise in Microwave Circuits: Devices, Circuits and Measurement", IEEE, 2022, pp.359375. doi: 10.1002/9781119859390.ch20

5. Legrand, F., Macabiau, C., Issler, J.L., Lestarquit, L. and Mehlen, C., "Improvement of Pseudorange Measurements Accuracy by Using Fast Adaptive Bandwidth Lock Loops, ION GPS 2000" 13th International Technical Meeting of the Satellite Division of the Institute of Navigation, Salt Lake City, USA, 2000.

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3