Distributed Double Differential Space-Time Coding with Amplify-and-Forward Relaying

Authors

  • Sylvia Ong Ai Ling Faculty of Engineering, Universiti Malaysia Sarawak, Kota Samarahan, Kuching, Sarawak, Malaysia.
  • Hushairi Zen Faculty of Engineering, Universiti Malaysia Sarawak, Kota Samarahan, Kuching, Sarawak, Malaysia.
  • Al-Khalid Othman Faculty of Engineering, Universiti Malaysia Sarawak, Kota Samarahan, Kuching, Sarawak, Malaysia.
  • Khairuddin Hamid Faculty of Engineering, Universiti Malaysia Sarawak, Kota Samarahan, Kuching, Sarawak, Malaysia.

Keywords:

Distributed Space-Time Coding, Double Differential Detection, Frequency Offsets, Sphere Decoding, Time-Varying Relaying Channel,

Abstract

This paper provides the double differentially modulated distributed space-time coding for amplify-andforward (AF) relaying cooperative communications system under time-varying fading channels. In many wireless systems, the communication terminals are mobile. In such case, frequency offsets arise subjected to Doppler’s effect and frequency mismatch amongst the terminals’ local oscillators. The double differential coding is proposed to overcome the problem of frequency offsets that present in the channel due to the rapidly fast moving nodes. The advantage of the double differential is that the scheme requires neither channel nor frequency offset knowledge for decoding process at the desired destination. However, the conventional two-codeword approach fails to perform and leads to error floor, a region where the error probability performance curve flattens for high signal-to-noise ratio (SNR) regime in fast fading environment. Hence, a low complexity multiple-codeword double differential sphere decoding (MCDDSD) is proposed. The simulation results show that the proposed MCDDSD significantly improve the system performance in time-varying environment.

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Published

2018-03-01

How to Cite

Ling, S. O. A., Zen, H., Othman, A.-K., & Hamid, K. (2018). Distributed Double Differential Space-Time Coding with Amplify-and-Forward Relaying. Journal of Telecommunication, Electronic and Computer Engineering (JTEC), 10(1-12), 45–50. Retrieved from https://jtec.utem.edu.my/jtec/article/view/3824

Issue

Vol. 10 No. 1-12: Gearing for a Greener Future

Section

Articles

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