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Performance comparison of NRZ, AMI and DPSK modulation schemes in multi-input multi-output mode division multiplexing based radio over FSO transmission system

KARAMJEET SINGH1,2, AMIT GROVER2, MEHTAB SINGH3,4,* , JYOTEESH MALHOTRA3

Affiliation

  1. Department of Electronics and Communication Engineering, IKG-PTU, Kapurthala, India
  2. Department of Electronics and Communication Engineering, Shaheed Bhagat Singh State University, Ferozepur, India
  3. Department of Engineering and Technology, Guru Nanak Dev University, Regional Campus, Jalandhar, India
  4. Department of Electronics and Communication Engineering, SIET, Amritsar (IKG-PTU, Kapurthala), India

Abstract

In this research, the performance of a 2 2, 3 3, and 4 4 optical multi-input-multi-output (MIMO) transmission-based radio over free space optics (RoFSO) link using mode division multiplexing (MDM) technique is reported. The link performance is evaluated and compared for non-return to zero (NRZ), differential phase-shift keying (DPSK), and alternate mark inversion (AMI) modulation over varying range of FSO link. Modulation schemes performance has been compared employing the received signal-to-noise ratio (SNR) as the performance metrics. The results exhibit that the DPSK modulation scheme performs the best, followed by AMI and NRZ scheme for all MIMO-MDM-based RoFSO systems. Effective transmission of 40Gbps-80GHz information in clear weather conditions over a 16 km FSO link range with appropriate SNR (> 20 dB) was demonstrated in the MDM-RoFSO transmission system which is based on DPSK modulation. This is a major improvement in information capacity and connectivity compared to previously reported literature.

Keywords

MIMO, RoFSO, MDM, Attenuation, Link range.

Citation

KARAMJEET SINGH, AMIT GROVER, MEHTAB SINGH, JYOTEESH MALHOTRA, Performance comparison of NRZ, AMI and DPSK modulation schemes in multi-input multi-output mode division multiplexing based radio over FSO transmission system, Optoelectronics and Advanced Materials - Rapid Communications, 15, 7-8, July-August 2021, pp.332-340 (2021).

Submitted at: Oct. 8, 2020

Accepted at: Aug. 16, 2021