Analytical study on the effect of cochannel interference on partially coherent diversity systems

• Published in: IEEE transactions on communications 2009-01, Vol.57 (1), p.117-124
• Main Authors: Smadi, M., Prabhu, V., Al-jazzar, S.
• Format: Article
• Language: English
• Subjects: Applied classical electromagnetism; Applied sciences; Binary phase shift keying; carrier phase error; Channels; Cochannel interference; Codes; Coherence; Diffraction, scattering, reflection; Diversity reception; Electromagnetic wave propagation, radiowave propagation; Electromagnetism; electron and ion optics; equal-gain combining; Exact sciences and technology; Fading; Fourier series; Fundamental areas of phenomenology (including applications); Gain; generalized fading channels; Information, signal and communications theory; Interchannel interference; Interference; Intersymbol interference; Mathematical analysis; Mathematical models; Modulation, demodulation; Physics; Quadrature phase shift keying; quazi-analytical simulation; Radiocommunications; Radiofrequency interference; Radiowave propagation; Rician channels; Signal and communications theory; Studies; Systems, networks and services of telecommunications; Telecommunications; Telecommunications and information theory; Timing; Transmission and modulation (techniques and equipments)
• ISSN: 0090-6778; 1558-0857
• DOI: 10.1109/TCOMM.2009.0901.060558

In this paper, we study the effect of cochannel interference (CCI) on the performance of partially coherent BPSK and QPSK in uncorrelated L-branch equal-gain combining systems. We consider a generalized propagation model wherein the desired and interfering signals undergo Nakagami-m or Rician fading with different amounts of fading severity. Further, the interfering signals are assumed to be asynchronous symbol timing with the desired signal, so that the effect of cross-signal intersymbol interference (ISI) is taken into account. Using a convergent Fourier series method, we derive extensive analytical results for the average bit error probability and the SNR gain penalty caused by the interference signals for different signal to-interference ratio levels. The numerical results presented in this paper demonstrate the system performance under very realistic propagation and detection conditions including CCI, carrier phase error recovery, cross-signal ISI, generalized fading channels, and AWGN. Hence our results are expected to be of significant practical use for such scenarios.