Mohammed S. Aloqlah

Performance Analysis of Digital Communication Systems Over

This paper analyzes and evaluates the performance of digital communication systems that operate over the α-η-μ fading channels. More specifically, we derived novel, unified, and exact closed-form analytical expressions for the cumulative density function (CDF), the moment-generating function (MGF), the average channel capacity, and the average symbol error probability (SEP) for several coherent and non-coherent modulation schemes. Note that the derived expressions are valid for arbitrary values of the fading parameters. The derived expressions are then used to study the implication of the fading parameters on system performance. In addition, the performance over other well-known fading channels, such as η-μ and α-μ, as well as their inclusive special cases, can be analyzed using our results. To validate the correctness of our derivations, the numerical results are compared with Monte Carlo simulation results. Both results are in perfect agreement over a wide range of average signal-to-noise ratio (SNR) and different values of the fading parameters.

\alpha{-}\eta{-}\mu

The performance of spectrum-sensing based energy-detection (ED) in cognitive radio networks (CRNs) over the extended generalized-K (EGK) fading channels is analyzed. More specifically, exact and accurate analytical expressions for the average detection probability under different detection scenarios, such as, single channel (no diversity), diversity reception, and cooperative spectrum sensing, are derived and evaluated. The derived analytical framework can be used for both integer and non-integer values of the fading/shadowing parameters. The impact of the fading/shadowing parameters on the performance of energy detectors is studied in terms of receiver operating characteristics (ROC) curves. To verify the correctness of our analysis, the derived analytical expressions are corroborated via Monte-Carlo simulation results.

Fading Channels

Dual-hop transmission systems employing decodeand-forward relay are studied in this paper. The examination has been done for independent, but not necessarily identical Extended Generalized-K fading channels. New, exact, closedform expressions are derived for the outage probability, the nth moments of the end-to-end signal-to-noise ratio (SNR), and the ergodic capacity. Moreover, the average symbol error probability (ASEP) for coherent and non-coherent modulation schemes is derived. Analytical results along with simulation results are obtained with excellent agreement.

Energy-detection based spectrum-sensing in cognitive radio networks over multipath/shadowed fading channels

Performance of ED in CRNs over EGK fading channels is analyzed.Unified analytical expressions for the average detection probability are derived.Performance of diversity reception and cooperative sensing is analyzed. Display Omitted This paper analyzes the performance of spectrum-sensing-based energy detection (ED) in cognitive radio networks (CRNs) over generalized fading channels. The fading channel is modeled by the extended generalized-K (EGK) distribution. Exact and accurate analytical expressions for the average detection probability with different detection schemes, such as, single channel, diversity reception, and cooperative spectrum sensing, are derived and evaluated. Obtained expressions can be reduced to other well-known fading channels such as, Weibull, Nakagami-m, and Rayleigh. It is shown that the analytical framework can be used for both integer and non-integer values of the fading/shadowing parameters. The impact of key fading/shadowing parameters on the performance of energy detectors is discussed with receiver operating characteristics (ROC) curves. The accuracy of the derived analytical expressions is corroborated via Monte-Carlo simulation results.

Performance Analysis of Dual-Hop Systems with Decode- and-Forward Relays over Generalized Fading Channels

This paper presents and evaluates the performance of wireless networks that utilize the decode-and-forward relay. The performance of the aforementioned relaying scheme operating over Extended Generalized-K (EGK) composite fading channels. One important feature of the EGK fading model is its versatility in the sense of including many types of the popular fading models as particular cases. In addition, the EGK fading model can be considered as a convenient candidate to characterize complicated wireless channels in which both multipath fading and shadowed phenomena simultaneously exists. To this effect, new exact and easy to compute formulas for several performance metrics are derived. More specifically, new and exact-form mathematical formulas are derived for the cumulative distribution function (CDF), the generalized moments of the overall end-to-end signal-to-noise ratio (SNR), the outage probability (Pout), the ergodic capacity (CErgodic), the moment generating function (MGF), and the average error probability (AEP) for different modulation schemes. Moreover, we carried out a series of computer simulation experiments in order to testify the accuracy of the derived framework. Finally, we discussed the impact of different parameters including fading/shadowing parameters, transmitted power and the number of hops on the derived expressions.

Spectrum-sensing in cognitive radio networks over composite multipath/shadowed fading channels

Dual-hop transmission systems employing fixed-gain amplify-and-forward relay are studied in this paper. The examination has been done for independent and not necessarily identical Extended Generalized-K fading channels. New, exact closed-form expressions are derived for the nth moments of the end-to-end signal-to-noise ratio (SNR). The average end-to-end SNR and the amount of fading (AoF) of the system are also derived. Some numerical plots show that the influence of the power imbalance between the two hops may have gainful or harmful effects on the overall system performance.

Performance study of decode and forward based multi-hop relaying in wireless networks over extended generalized-K fading channels

In current cooperative communication systems, a relay terminal is very often used as an intermediate node. Introducing this node may degrade or improve the overall system performance, depending on the power imbalance between the hops. In this paper a unified framework to estimate the performance of dual-hop fixed-gain relay system when each hop is subjected to κ-μ shadowed fading is presented. Specifically, new closed form expressions are derived for the outage probability, the generalized moments, the moment generating function (MGF), and the ergodic capacity. This unified analytical framework is obtained in terms of well-known and easily computable functions. The accuracy of the analytical results is verified through computer simulations.

End-to-end performance analysis of dual-hop relaying systems over Extended Generalized K-fading channels

In current cooperative communication systems, a relay terminal is very often used as intermediate node and may degrade or improve the overall system performance, depending on the power imbalance between the hops. In this paper, an approach to estimate the performance of dual-hop fixed-gain relay system when each hop is subjected to extended generalized-K fading is presented. New closed form expressions are derived for the cumulative distribution function, the outage probability, and the ergodic capacity. Moreover, the average symbol error probability for coherent and non-coherent modulation schemes is derived. The accuracy of analytic results is verified through computer simulations.

Accurate performance evaluation of semi-blind dual-hop wireless relay systems under generalized fading

This paper analyzes and evaluates the statistical properties of the rms delay spread (delay spread) in a two-path simulcast environment and same frequency in cell repeater. Each path is subjected to multipath fading characterized by wideband Weibull distribution. A novel, unified, and accurate analytical expressions for the probability density function, the mean, the mean square, and the standard deviation for the delay spread have been derived. The derived expressions are then used to study the implication of the fading and scale parameters on the statistical characteristics of the delay spread. To validate the accuracy of the derived formulas, the analytical results are compared with Monte-Carlo simulation results. Full agreement has been noticed between the simulated and the analytical results over a wide range of received signals levels ratio and different values of the fading parameters.

Performance Analysis of Dual-Hop Fixed-Gain Relay Systems over Extended Generalized-K Fading Channels

Modern cooperative telecommunication networks are currently utilizing a relay terminal, which is frequently exploited as an intermediate stage. This technique is vitally significant for the sake of performance enhancement and coverage extension with no further increment of the transmitted RF power. These benifits can be further improved by introducing multiple antennas at both source and destination nodes. In this paper, a two-hop multi-antenna wireless transmission system which is equipped with a fixed-gain aided amplify and forward relay node is investigated. A complete analytical framework to estimate the end-to-end (e2e) performance when both the source-relay and relay-destination links are subjected to independent but non-identical (i.n.i.d) k - μ shadowed fading is derived. More specifically, new accurate and easy to compute mathematical expressions, using an accurate form of the e2e signal-to-noise ratio (SNR) density function, are derived for several fundamental performance metrics that fully describe the contemplated system, namely, the outage probability (Pout), the moment generating function (MGF), and the average symbol error probability (ASEP) for a single two-hop transmission system. This unified analytical framework is obtained in terms of well-known and easily computable functions. Finally, all the analytical results for the antecedent performance descriptors are verified through computer simulations in the respect of accuracy.