Indian Journal of Innovations and Developments

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Effect of TWTA Non-Linearity on Satellite Communication System:A Simulation Approach


Affiliations
1 GCET, Jammu, India
2 Electronics &Electrical Communication Department, IIT-Kharagpur, India
 

Objective: In order to minimize the system degradation, the main aim is to measure the performance of the HPA by simulation. This has been done with the evaluation of Bit Error Rate because this quantifies the reliability of the entire communication system from ‘bits in’ to ‘bits out’ including the electronics, antennas and signal path in between.

Method: A comparative study and analysis of the performance of band limited M-ary PSK signal transmitted through band pass nonlinearity, typically an on-board TWT amplifier in a satellite repeater, exhibiting AM-AM and AM-PM conversions is carried out in terms of BER plots and constellation diagram using TOPSIM simulation tool.

Application: The measurement of performance by simulation will help in tracking down the offending elements and will be useful for implementation in the actual design

Conclusion: It is observed from the BER plots for M-ary PSK modulation system in the presence of TWTA non linearity having different uplink noise and input back off level that the performance of BER drastically goes down. Thus it gives the precaution that should be taken before passing the attenuated signal through high power amplifier.


Keywords

Bit Error Rate, TWTA, Phase Shift Keying, High Power Amplifier.
User
Notifications

  • O. Shimbo. Effects of intermodulation, AM-PM conversion and additive noise in multicarrier TWT systems. Proceedings of the lEEE. 1971; 59(2), 230-238.

  • A. Rosenbaum. Binary PSK error probabilities with multiple co-channel interferences. IEEE Transactions on Communication Technology.1970; 18(3), 241-253.

  • TC. Huang, JK. Omura, WC. Lindsey. Analysis of co-channel interference and noise. IEEE Transactions on Communication. 1981; 29, 593-604.

  • LC. Palmer. Computer modeling and simulation of communication satellite channels. IEEE Journal on Selected Areas in Communications. 1984; 2(1), 89-102.

  • A. Bernardini, R. Bausani, R. Pattuelli. Semi-Analytical performance evaluation in satellite digital links in the presence of interference. IEEE Transactions on Communications. 1993; 41(7), 1031-1035.

  • IK. Hwang, L. Kurz. Digital data transmission over nonlinear satellite channels. IEEE Transactions on Communications. 1993; 41(11), 1694-1702.

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  • AAM. Saleh. Frequency-independent and frequency dependent nonlinear models of TWT amplifiers. IEEE Transactions on Communications. 1981; 29(11), 1715-1720.

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  • Effect of TWTA Non-Linearity on Satellite Communication System:A Simulation Approach

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Authors

Sameru Sharma
GCET, Jammu, India
S. S. Pathak
Electronics &Electrical Communication Department, IIT-Kharagpur, India

Abstract


Objective: In order to minimize the system degradation, the main aim is to measure the performance of the HPA by simulation. This has been done with the evaluation of Bit Error Rate because this quantifies the reliability of the entire communication system from ‘bits in’ to ‘bits out’ including the electronics, antennas and signal path in between.

Method: A comparative study and analysis of the performance of band limited M-ary PSK signal transmitted through band pass nonlinearity, typically an on-board TWT amplifier in a satellite repeater, exhibiting AM-AM and AM-PM conversions is carried out in terms of BER plots and constellation diagram using TOPSIM simulation tool.

Application: The measurement of performance by simulation will help in tracking down the offending elements and will be useful for implementation in the actual design

Conclusion: It is observed from the BER plots for M-ary PSK modulation system in the presence of TWTA non linearity having different uplink noise and input back off level that the performance of BER drastically goes down. Thus it gives the precaution that should be taken before passing the attenuated signal through high power amplifier.


Keywords


Bit Error Rate, TWTA, Phase Shift Keying, High Power Amplifier.

References