Anas Salhab - Academia.edu (original) (raw)

Papers by Anas Salhab

Research paper thumbnail of Performance Analysis of A Beyond 3G Mobile Communication System in the Presence of Co-channel Interference

This paper presents a new model for systems beyond 3G of cellular communication techniques. The p... more This paper presents a new model for systems beyond 3G of cellular communication techniques. The proposed scheme includes several new techniques: multiple-input multiple-output (MIMO), orthogonal frequency division multiplexing (OFDM), and smart antennas (beamforming). The performance analysis was done in an interference-rich environment, and closed form expression for SINR was also determined. The results proved the effectiveness of the proposed system, particularly, in the presence of co-channel interference (CCI).

Research paper thumbnail of Cognitive Amplify-and-Forward Relay Networks with Switch-and-Examine Relaying in Rayleigh Fading Channels

IEEE Communications Letters, 2000

ABSTRACT In this paper, we analyze the performance of cognitive amplify-and-forward (AF) relay ne... more ABSTRACT In this paper, we analyze the performance of cognitive amplify-and-forward (AF) relay networks with beamforming under the peak interference power constraint of the primary user (PU). We focus on the scenario that beamforming is applied at the multi-antenna secondary transmitter and receiver. Also, the secondary relay network operates in channel state information-assisted AF mode, and the signals undergo independent Nakagami-m fading. In particular, closed-form expressions for the outage probability and ...

Research paper thumbnail of Outage analysis of N<sup>th</sup>-best DF relay networks in the presence of CCI over Rayleigh fading channels

2013 IEEE International Conference on Communications (ICC), 2013

In this paper, we investigate the outage behavior of a dual-hop N th -best decode-and-forward (DF... more In this paper, we investigate the outage behavior of a dual-hop N th -best decode-and-forward (DF) relay system with co-channel interference (CCI) at both the relays and the destination. The source-relay and relay-destination channels as well as the interferers' channels at both the relay and the destination nodes are assumed to follow Rayleigh distribution. Exact closed-form expressions for the outage probability for both independent non-identically distributed (i.n.d.) and independent identically distributed (i.i.d.) cases of interferers' channels are derived in this paper. Furthermore, the system behavior at high signal-to-noise ratio (SNR) values is studied via deriving an approximate expression for the asymptotic outage probability as well as the diversity order and the coding gain. The analytical results are supported and validated by Monte-Carlo simulations. Our findings suggest that the diversity order linearly increases with the number of relays and linearly decreases with the order of the relay. Also, the results show that the system is still able to achieve full diversity gain in the presence of finite number of interferers with finite powers.

Research paper thumbnail of Performance Analysis of Amplify-and-Forward Relay Systems with Interference-Limited Destination in Various Rician Fading Channels

Wireless Personal Communications, 2014

With the growing application for of wireless services, the capacity of 2G (2nd Generation) networ... more With the growing application for of wireless services, the capacity of 2G (2nd Generation) networks and 3G (3rd Generation) is reaching saturation point. New technologies become interest to researchers to meet with developed services, from these technologies a multi-hop relay system. This paper presents the performance analysis of amplify and forward (AF) relay network. In order to get a realistic transmission, the Signal to noise ratio (SNR) and bit rate during Uplink (UL) and Downlink (DL) transmission mode are derived in this paper. Moreover this paper discusses the impact of relay placement node to provide a maximum achievable rate at users and increase the coverage especially at cell edge regions. The numerical results shown there are enhancing in bit rate by using AF relay in comparison with direct link.

Research paper thumbnail of Exact Outage Probability of Opportunistic DF Relay Systems With Interference at Both the Relay and the Destination Over Nakagami-<formula formulatype="inline"><tex Notation="TeX">$m$</tex></formula> Fading Channels

IEEE Transactions on Vehicular Technology, 2000

In this paper, we investigate the outage behavior of a dual-hop opportunistic decode-and-forward ... more In this paper, we investigate the outage behavior of a dual-hop opportunistic decode-and-forward (DF) relay system with co-channel interference (CCI) at both the relay and the destination. The source-relay and relay-destination channels as well as the interferers' channels at both the relay and the destination nodes are assumed to follow Nakagami-m distribution. Exact closed-form expressions for the outage probability for both independent non-identically distributed (i.n.d.) and independent identically distributed (i.i.d.) cases of interferers' channels are derived in this paper. Furthermore, the system behavior at high SNR values is studied via deriving the asymptotic outage probability. Our finding suggest that the co-channel interferers do not reduce the diversity order of the system, instead, they degrade the outage performance by affecting the coding gain of the system. The accuracy of the analytical results are supported by Monte-Carlo simulations.

Research paper thumbnail of Cognitive Opportunistic DF Relay Networks with Interference and Multiple Primary Receivers Using Orthogonal Spectrums

Arabian Journal for Science and Engineering, 2014

Research paper thumbnail of Performance of Nth-best antenna selection diversity systems with co-channel interference and outdated channel information

IET Communications, 2014

ABSTRACT In this study, the authors evaluate the performance of space diversity systems with the ... more ABSTRACT In this study, the authors evaluate the performance of space diversity systems with the Nth-best antenna selection scheme in the presence of interference and outdated channel information (OC1). The Nth-best antenna selection scheme is efficient in situations where the second or even the Nth best antenna is mistakenly selected by the destination instead of the first best antenna for data reception. In this study, they first derive the cumulative distribution function (CDF) of the end-toend (e2e) signal-to-interference plus noise ratio at the selection scheme combiner output. This CDF is then used to derive exact closed-form expressions for the e2e outage probability and symbol error probability (SEP) of the system. In the analysis, the channels of the desired user and the interferers are assumed to follow Rayleigh distribution. Furthermore, to obtain more about system insights, the performance is studied at the high signal-to-noise ratio (SNR) regime where the diversity order and coding gain are derived. Monte Carlo simulations are provided to validate the derived analytical and asymptotic expressions. Main results illustrate that with an interference power that is not scaling with SNR, the system can still achieve diversity gain when more receive antennas are used. Also, findings show that the diversity order of the system is linearly decreasing with increasing the order of the antenna, and linearly increasing with decreasing it. Furthermore, results illustrate that as the higher the correlation coefficient between the SNRs of antennas at the selection and transmission time instances, the better the achieved performance.

Research paper thumbnail of Fixed-gain AF relaying with interference-limited destination in Rician/Nakagami-m fading channels

2013 IEEE Wireless Communications and Networking Conference (WCNC), 2013

Ahstract-Co-channel interference (CCI) has an inevitable effect on the performance of cooperative... more Ahstract-Co-channel interference (CCI) has an inevitable effect on the performance of cooperative systems. It is a result of sharing the same time slot among several nodes. In this paper, we address the impact of CCI at the destination node on the performance of a dual-hop fixed-gain amplify-and-forward (AF) relay system. A noise-limited relay and an interference limited destination are assumed in the analysis. Furthermore, the source-relay and the relay-destination channels of the desired user are assumed to be Rician distributed and the interferers' channels are assumed to follow the Nakagami-m distribution. We derive approximate expressions for the outage probability and the symbol error rate (SER) for both the independent non-identically distributed (i.n.d.) and independent identically distributed (i.i.d.)

Research paper thumbnail of A low-complexity relaying protocols for incremental DF relay systems with co-channel interference

2013 IEEE 24th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC), 2013

In this paper, we evaluate the interference effect on the performance of incremental decode-and-f... more In this paper, we evaluate the interference effect on the performance of incremental decode-and-forward (DF) relay systems with a low-complexity relaying protocols and interference at the relays and destination. These protocols are based on the switch-andexamine diversity combining (SEC) and switch-and-examine diversity combining with post-examining selection (SECps) techniques. Based on the relaying criterion, the first checked relay whose second hop signal-to-noise ratio (SNR) satisfies a predetermined switching threshold is asked to forward the source message to destination only if the direct link is in outage. Closed-form expression is derived for the end-to-end (e2e) outage probability assuming Rayleigh fading channels. Also, the system performance is studied at high SNR regime for the two relaying protocols where the diversity order and coding gain are derived and analyzed. We assume that maximalratio combining (MRC) is used at the destination to combine the signal through the relay with that on the direct link. Monte-Carlo simulations are provided to validate the achieved analytical results. Findings illustrate that despite the presence of interference, the system still achieves performance gain and that the outage probability decreases when the number of relays increases, especially, in the range of SNR values that are comparable to switching threshold. Also, results show the effectiveness of the SEC and SECps relaying protocols in reducing the system complexity compared to the existing protocols as the opportunistic relaying.

Research paper thumbnail of Performance of Switch-and-Examine DF Relay Systems with CCI at the Relays and Destination over Rayleigh Fading Channels

IEEE Transactions on Vehicular Technology, 2000

In this paper, we evaluate the outage performance of a decode-and-forward (DF) relay system with ... more In this paper, we evaluate the outage performance of a decode-and-forward (DF) relay system with two lowcomplexity relay selection schemes and interference at the relays and destination. The schemes are mainly based on the switchand-examine diversity combining (SEC) and SEC post-examine selection (SECps) techniques in which a relay out of multiple relays is selected to forward the source message to destination. The selection process is performed such that the signal-to-noise ratio (SNR) of second hop of the selected relay satisfies a predetermined switching threshold. In this paper, we first derive the probability density function (PDF) of SNR of the relay selection scheme and the conditional cumulative distribution function (CDF) of end-to-end (e2e) signal-to-interference plus noise ratio (SINR) assuming Rayleigh fading channels. The derived statistics along with the statistics of first hop channels of the relays and the direct link are then used to derive a closed-form expression for the e2e outage probability. Maximal-ratio combining (MRC) is used at the destination to combine the signals from the relay and the direct link. Furthermore, the outage performance is studied at high SNR regime where approximate expressions for the outage probability, diversity order, and coding gain are derived and analyzed. Monte-Carlo simulations and some numerical examples are provided to illustrate the validity of the derived results and to show the effect of interference and other parameters on the system performance. Main results illustrate that when the interference power is fixed, the system can still achieve some performance gain when more relays are added; especially, at SNR values that are comparable to the switching threshold. Asymptotic results show that at high SNR, the system with the SEC and SECps relaying schemes achieves a diversity order of 2 and approximately the same coding gain. Furthermore, findings illustrate that the interference at the destination is more severe on the system performance compared to that at the relays. Finally, results show that the interference is severely affecting the gain achieved in system performance when the SECps relaying scheme is used compared to the conventional SEC relaying.

Research paper thumbnail of Performance Analysis of A Beyond 3G Mobile Communication System in the Presence of Co-channel Interference

This paper presents a new model for systems beyond 3G of cellular communication techniques. The p... more This paper presents a new model for systems beyond 3G of cellular communication techniques. The proposed scheme includes several new techniques: multiple-input multiple-output (MIMO), orthogonal frequency division multiplexing (OFDM), and smart antennas (beamforming). The performance analysis was done in an interference-rich environment, and closed form expression for SINR was also determined. The results proved the effectiveness of the proposed system, particularly, in the presence of co-channel interference (CCI).

Research paper thumbnail of Cognitive Amplify-and-Forward Relay Networks with Switch-and-Examine Relaying in Rayleigh Fading Channels

IEEE Communications Letters, 2000

ABSTRACT In this paper, we analyze the performance of cognitive amplify-and-forward (AF) relay ne... more ABSTRACT In this paper, we analyze the performance of cognitive amplify-and-forward (AF) relay networks with beamforming under the peak interference power constraint of the primary user (PU). We focus on the scenario that beamforming is applied at the multi-antenna secondary transmitter and receiver. Also, the secondary relay network operates in channel state information-assisted AF mode, and the signals undergo independent Nakagami-m fading. In particular, closed-form expressions for the outage probability and ...

Research paper thumbnail of Outage analysis of N<sup>th</sup>-best DF relay networks in the presence of CCI over Rayleigh fading channels

2013 IEEE International Conference on Communications (ICC), 2013

In this paper, we investigate the outage behavior of a dual-hop N th -best decode-and-forward (DF... more In this paper, we investigate the outage behavior of a dual-hop N th -best decode-and-forward (DF) relay system with co-channel interference (CCI) at both the relays and the destination. The source-relay and relay-destination channels as well as the interferers' channels at both the relay and the destination nodes are assumed to follow Rayleigh distribution. Exact closed-form expressions for the outage probability for both independent non-identically distributed (i.n.d.) and independent identically distributed (i.i.d.) cases of interferers' channels are derived in this paper. Furthermore, the system behavior at high signal-to-noise ratio (SNR) values is studied via deriving an approximate expression for the asymptotic outage probability as well as the diversity order and the coding gain. The analytical results are supported and validated by Monte-Carlo simulations. Our findings suggest that the diversity order linearly increases with the number of relays and linearly decreases with the order of the relay. Also, the results show that the system is still able to achieve full diversity gain in the presence of finite number of interferers with finite powers.

Research paper thumbnail of Performance Analysis of Amplify-and-Forward Relay Systems with Interference-Limited Destination in Various Rician Fading Channels

Wireless Personal Communications, 2014

With the growing application for of wireless services, the capacity of 2G (2nd Generation) networ... more With the growing application for of wireless services, the capacity of 2G (2nd Generation) networks and 3G (3rd Generation) is reaching saturation point. New technologies become interest to researchers to meet with developed services, from these technologies a multi-hop relay system. This paper presents the performance analysis of amplify and forward (AF) relay network. In order to get a realistic transmission, the Signal to noise ratio (SNR) and bit rate during Uplink (UL) and Downlink (DL) transmission mode are derived in this paper. Moreover this paper discusses the impact of relay placement node to provide a maximum achievable rate at users and increase the coverage especially at cell edge regions. The numerical results shown there are enhancing in bit rate by using AF relay in comparison with direct link.

Research paper thumbnail of Exact Outage Probability of Opportunistic DF Relay Systems With Interference at Both the Relay and the Destination Over Nakagami-<formula formulatype="inline"><tex Notation="TeX">$m$</tex></formula> Fading Channels

IEEE Transactions on Vehicular Technology, 2000

In this paper, we investigate the outage behavior of a dual-hop opportunistic decode-and-forward ... more In this paper, we investigate the outage behavior of a dual-hop opportunistic decode-and-forward (DF) relay system with co-channel interference (CCI) at both the relay and the destination. The source-relay and relay-destination channels as well as the interferers' channels at both the relay and the destination nodes are assumed to follow Nakagami-m distribution. Exact closed-form expressions for the outage probability for both independent non-identically distributed (i.n.d.) and independent identically distributed (i.i.d.) cases of interferers' channels are derived in this paper. Furthermore, the system behavior at high SNR values is studied via deriving the asymptotic outage probability. Our finding suggest that the co-channel interferers do not reduce the diversity order of the system, instead, they degrade the outage performance by affecting the coding gain of the system. The accuracy of the analytical results are supported by Monte-Carlo simulations.

Research paper thumbnail of Cognitive Opportunistic DF Relay Networks with Interference and Multiple Primary Receivers Using Orthogonal Spectrums

Arabian Journal for Science and Engineering, 2014

Research paper thumbnail of Performance of Nth-best antenna selection diversity systems with co-channel interference and outdated channel information

IET Communications, 2014

ABSTRACT In this study, the authors evaluate the performance of space diversity systems with the ... more ABSTRACT In this study, the authors evaluate the performance of space diversity systems with the Nth-best antenna selection scheme in the presence of interference and outdated channel information (OC1). The Nth-best antenna selection scheme is efficient in situations where the second or even the Nth best antenna is mistakenly selected by the destination instead of the first best antenna for data reception. In this study, they first derive the cumulative distribution function (CDF) of the end-toend (e2e) signal-to-interference plus noise ratio at the selection scheme combiner output. This CDF is then used to derive exact closed-form expressions for the e2e outage probability and symbol error probability (SEP) of the system. In the analysis, the channels of the desired user and the interferers are assumed to follow Rayleigh distribution. Furthermore, to obtain more about system insights, the performance is studied at the high signal-to-noise ratio (SNR) regime where the diversity order and coding gain are derived. Monte Carlo simulations are provided to validate the derived analytical and asymptotic expressions. Main results illustrate that with an interference power that is not scaling with SNR, the system can still achieve diversity gain when more receive antennas are used. Also, findings show that the diversity order of the system is linearly decreasing with increasing the order of the antenna, and linearly increasing with decreasing it. Furthermore, results illustrate that as the higher the correlation coefficient between the SNRs of antennas at the selection and transmission time instances, the better the achieved performance.

Research paper thumbnail of Fixed-gain AF relaying with interference-limited destination in Rician/Nakagami-m fading channels

2013 IEEE Wireless Communications and Networking Conference (WCNC), 2013

Ahstract-Co-channel interference (CCI) has an inevitable effect on the performance of cooperative... more Ahstract-Co-channel interference (CCI) has an inevitable effect on the performance of cooperative systems. It is a result of sharing the same time slot among several nodes. In this paper, we address the impact of CCI at the destination node on the performance of a dual-hop fixed-gain amplify-and-forward (AF) relay system. A noise-limited relay and an interference limited destination are assumed in the analysis. Furthermore, the source-relay and the relay-destination channels of the desired user are assumed to be Rician distributed and the interferers' channels are assumed to follow the Nakagami-m distribution. We derive approximate expressions for the outage probability and the symbol error rate (SER) for both the independent non-identically distributed (i.n.d.) and independent identically distributed (i.i.d.)

Research paper thumbnail of A low-complexity relaying protocols for incremental DF relay systems with co-channel interference

2013 IEEE 24th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC), 2013

In this paper, we evaluate the interference effect on the performance of incremental decode-and-f... more In this paper, we evaluate the interference effect on the performance of incremental decode-and-forward (DF) relay systems with a low-complexity relaying protocols and interference at the relays and destination. These protocols are based on the switch-andexamine diversity combining (SEC) and switch-and-examine diversity combining with post-examining selection (SECps) techniques. Based on the relaying criterion, the first checked relay whose second hop signal-to-noise ratio (SNR) satisfies a predetermined switching threshold is asked to forward the source message to destination only if the direct link is in outage. Closed-form expression is derived for the end-to-end (e2e) outage probability assuming Rayleigh fading channels. Also, the system performance is studied at high SNR regime for the two relaying protocols where the diversity order and coding gain are derived and analyzed. We assume that maximalratio combining (MRC) is used at the destination to combine the signal through the relay with that on the direct link. Monte-Carlo simulations are provided to validate the achieved analytical results. Findings illustrate that despite the presence of interference, the system still achieves performance gain and that the outage probability decreases when the number of relays increases, especially, in the range of SNR values that are comparable to switching threshold. Also, results show the effectiveness of the SEC and SECps relaying protocols in reducing the system complexity compared to the existing protocols as the opportunistic relaying.

Research paper thumbnail of Performance of Switch-and-Examine DF Relay Systems with CCI at the Relays and Destination over Rayleigh Fading Channels

IEEE Transactions on Vehicular Technology, 2000

In this paper, we evaluate the outage performance of a decode-and-forward (DF) relay system with ... more In this paper, we evaluate the outage performance of a decode-and-forward (DF) relay system with two lowcomplexity relay selection schemes and interference at the relays and destination. The schemes are mainly based on the switchand-examine diversity combining (SEC) and SEC post-examine selection (SECps) techniques in which a relay out of multiple relays is selected to forward the source message to destination. The selection process is performed such that the signal-to-noise ratio (SNR) of second hop of the selected relay satisfies a predetermined switching threshold. In this paper, we first derive the probability density function (PDF) of SNR of the relay selection scheme and the conditional cumulative distribution function (CDF) of end-to-end (e2e) signal-to-interference plus noise ratio (SINR) assuming Rayleigh fading channels. The derived statistics along with the statistics of first hop channels of the relays and the direct link are then used to derive a closed-form expression for the e2e outage probability. Maximal-ratio combining (MRC) is used at the destination to combine the signals from the relay and the direct link. Furthermore, the outage performance is studied at high SNR regime where approximate expressions for the outage probability, diversity order, and coding gain are derived and analyzed. Monte-Carlo simulations and some numerical examples are provided to illustrate the validity of the derived results and to show the effect of interference and other parameters on the system performance. Main results illustrate that when the interference power is fixed, the system can still achieve some performance gain when more relays are added; especially, at SNR values that are comparable to the switching threshold. Asymptotic results show that at high SNR, the system with the SEC and SECps relaying schemes achieves a diversity order of 2 and approximately the same coding gain. Furthermore, findings illustrate that the interference at the destination is more severe on the system performance compared to that at the relays. Finally, results show that the interference is severely affecting the gain achieved in system performance when the SECps relaying scheme is used compared to the conventional SEC relaying.