Dragan Lj. Draca

Cochannel interference effect on BEP performance of SSC receiver in correlated Rician fading

Abstract We study the performance of dual branch switch and stay combining (SSC) diversity receivers operating over correlated Rician fading channels, in the presence of correlated Rayleigh distributed cochannel interference (CCI). Fast convergent infinite series representations for both the joint probability density function (PDF) of the SSC input signal-to-interference ratios (SIRs) and the PDF of the SSC output SIR are derived. The last one is applied to semi-analytically study the average bit error probability (ABEP) of differential binary phase shift keying (DBPSK). Furthermore, the optimum switching threshold in the sense of minimum ABEP is obtained numerically and the effects of fading severity and branch correlation on both ABEP and optimum switching threshold are investigated. Numerical and simulation results are presented to support the mathematical analysis.

Average Level Crossing Rate of Dual Selection Diversity over Correlated Unbalanced Nakagami-m Fading Channels in the Presence of Cochannel Interference

A dual selection combining (SC) receiver which applies desired signal power algorithm and operates over correlated, but not necessary identically distributed Nakagami-m fading channels in the presence of cochannel interference (CCI) is considered in this letter. Actually, a novel infinite-series expression for the average level crossing rate (LCR) at the output of that SC receiver is obtained. Numerical results are presented to examine the effects of the fading severity, input signal-to-interference ratio (SIR) unbalance and the level of branch correlation on the average LCR, as well as the correctness of proposed analytical formulation.

Average Fade Duration of Dual Selection Diversity over Correlated Unbalanced Nakagami-m Fading Channels in the Presence of Cochannel Interference

Abstract A dual selection combining (SC) receiver with correlated and unbalanced diversity branches operating in interference-limited Nakagami-m fading environment is considered in this paper. Actually, average fade duration (AFD) of SC system applying desired signal decision algorithm is obtained. Numerical results can be used to examine the effects of fading severity, input signal-to-interference ratio (SIR) unbalance and level of branch correlation on the AFD, as well as the correctness of proposed analytical formulation.

The influence of crosstalk signal interference to signal propagation along the nonlinear and dispersive fiber

In this paper, the signal propagation along the fiber, in both absence or presence of the crosstalk signal interference at different places along the fiber, for both dispersive regime cases, is considered. The crosstalk appears at the transmitter output or along the fiber. The pulse shape at the receiver input is determined using Schrodinger equation [1]. The noise sources are the photodetector and resistance in the reciever. The bit error probability of intensity modulation and direct detection (IM-DD) system in the presence of the crosstalk, quantum and thermal noise is determined.

Average level crossing rate of microcellular mobile radio system with selection combining in the presence of arbitrary number of cochannel interferences

This paper provides an exact and rapidly converging infinite-series expression for the average level crossing rate of dual selection combining receiver in a communication system with a Rician desired signal affected by multiple Nakagami-m cochannel interferences. The branch selection is based on the desired signal power algorithm with input signals assumed to be correlated because of insufficient distance between diversity branches. The proposed mathematical analysis is complemented by various numerical results showing the effects of various systems parameters. Copyright © 2011 John Wiley & Sons, Ltd.

Effects of rician fading, branch correlation and interference number on sc system performance

Signal-to-interference ratio (SIR) based selection diversity is efficient technique to mitigate fading and cochannel interference in wireless communication systems. In this paper, performance of dual SIR based selection diversity system, as the least complicated diversity technique, over correlated Rician fading channels is analyzed in the presence of multiple equal power cochannel interferences. Useful formulae for the probability density function (PDF) and cumulative distribution function (CDF) of input SIRs at the selection combining (SC) receiver are derived. Numerical results are presented to show the effects of various parameters as the fading severity, level of correlation and number of interference to the systems outage performance.

Capacity of OFDM-based WLAN system with SC diversity

This paper considers how selection techniques applied in an orthogonal frequency division multiplexing (OFDM)-based wireless local area network (WLAN) system influence on a system performance. Namely, ergodic and outage capacity of the considered system are simulated in order to determine the most adequate receiver design for certain WLAN environment.

Channel capacity of dual SC system with desired signal decision algorithm in correlated Weibull fading

In this paper, the expression for channel capacity of dual correlated selection combining (SC) system applying desired signal decision algorithm is derived. Fading of both desired and cochannel interference (CCI) is modelled by Weibull distribution with different fading severity levels. Numerical results are presented to accomplish proposed mathematical analysis and to examine influence of branch correlation and fading severity on channel capacity.

Performance comparison of dual SC systems using different decision algorithms in the presence of interference

In this brief paper, we investigate selection combining (SC) technique, as one of the most efficient for upgrading transmission reliability and increasing channel capacity. Namely, dual SC diversity system operating over correlated Rician fading channels in the presence of Rayleigh cochannel interference (CCI) is studied. Desired signal power algorithm is explored by virtue of average bit error probability (ABEP), outage probability and average signal–to–interference ratio (SIR) at the output of the receiver. Presented numerical results aims to show effects of fading severity and level of correlation on considered performance metrics. Moreover, they are used for performance comparison of dual SC receivers applying two different decision algorithms, desired and SIR power algorithm, presenting the most significant contribution of this paper.

BEP comparison for dual SC systems using different decision algorithms in the presence of interference

Selection combining (SC) is one of the most efficient technique for mitigating deleterious effects of fading and cochannel interference in wireless communication systems. In this paper, bit error probability (BEP) performance of dual selection diversity system, which applies desired signal power algorithm, over correlated Rician fading channels in the presence of cochannel interference (CCI) is analyzed. Actually, the formula for the average BEP of considered diversity system is derived in the analytical form. Numerical results are presented to show the effects of various parameters such as the fading severity and level of correlation. Moreover, they are used to compare error performance of considered SC systems applying different decision algorithms.