... Mohamed-Slim Alouini Electrical and Computer Engineering Program Texas A&M Univer... more ... Mohamed-Slim Alouini Electrical and Computer Engineering Program Texas A&M University at Qatar Doha, Qatar alouini@qatar.tamu.edu ... adaptive modulation technique is often employed [7, 8]. In discrete rate adaptive modulation, a predetermined target BER, BERT , is set ...
IEEE Transactions on Wireless Communications, 2009
Abstract In this paper, we consider an incremental relaying protocol based on an amplify-and-forw... more Abstract In this paper, we consider an incremental relaying protocol based on an amplify-and-forward transmission in conjunction with the best relay selection scheme over non-identically distributed relay channels. In order to satisfy the spectral efficiency and the bit ...
IEEE Transactions on Wireless Communications, 2008
Opportunistic relaying with cooperative diversity has been introduced in as a simple alternative ... more Opportunistic relaying with cooperative diversity has been introduced in as a simple alternative protocol to the distributed space-time coded protocol while achieving the same diversity-multiplexing tradeoff performance as a point-to-point multiple-input multiple-output scheme. In this paper, we derive the upper and lower bounds for the cumulative distribution function of the signal-to-noise ratio per hop, and then provide their probability density function and moment generating function.We also derive approximate but tight closed-form expressions for the lower and upper bounds of the outage probability of opportunistic relaying based on decode-and-forward transmission under the assumption of unbalanced/balanced hops and independent, identically distributed Rayleigh fading channels.
In this paper, we propose a low complexity cooperative communication systems with the amplify-and... more In this paper, we propose a low complexity cooperative communication systems with the amplify-and-forward protocol over a multiple distributed relay network where only one relay among relay candidates is selected according to a certain threshold. By setting different values of their threshold, we consider two different relay selection schemes: (i) achieving the maximum spectral efficiency and (ii) minimizing system complexity.
Opportunistic relaying with cooperative diversity has been introduced in as a simple alternative ... more Opportunistic relaying with cooperative diversity has been introduced in as a simple alternative protocol to the distributed space-time coded protocol while achieving the same diversity-multiplexing tradeoff performance as a point-to- point multiple-input multiple-output scheme. In this paper, we derive an upper and lower bound on the per hop output signal-to- noise ratio cumulative distribution function, probability density function and moment generating function. We also derive approximate but tight closed-form expressions for the lower and upper bounds of the outage probability of opportunistic relaying based on decode-and-forward transmission under the assumption of unbalanced/balanced hops and independent, identical distributed Rayleigh fading channels.
In this letter, we propose two-way amplify-and-forward relaying in conjunction with adaptive modu... more In this letter, we propose two-way amplify-and-forward relaying in conjunction with adaptive modulation in order to improve spectral efficiency of relayed communication systems while monitoring the required error performance. We also consider a multiple relay network where only the best relay node is utilized so that the diversity order increases while maintaining a low complexity of implementation as the number of relays increases. Based on the best relay selection criterion, we offer an upper bound on the signal-to-noise ratio to keep the performance analysis tractable. Our numerical examples show that the proposed system offers a considerable gain in spectral efficiency while satisfying the error rate requirements.
In this paper, we consider two-way amplify-and-forward relaying communication over a multiple rel... more In this paper, we consider two-way amplify-and-forward relaying communication over a multiple relays network in which the best relay node is selected among others. Our proposed scheme picks for duplex communication between the source and the destination only the relay which provides the best end-to-end performance based on the instantaneous channel information. Similar to the relay selection method proposed, our scheme also does not require any explicit communications among the relays. Based on the proposed relay selection criterion, we offer the performance bounds on the average sum-rate, average symbol error rate, outage probability over identically, independent distributed Rayleigh fading channels. Further, our numerical examples show that our proposed scheme provides considerable sum-rate gains and offers an increasing a diversity order as the number of relay candidates increases.
... Mohamed-Slim Alouini Electrical and Computer Engineering Program Texas A&M Univer... more ... Mohamed-Slim Alouini Electrical and Computer Engineering Program Texas A&M University at Qatar Doha, Qatar alouini@qatar.tamu.edu ... adaptive modulation technique is often employed [7, 8]. In discrete rate adaptive modulation, a predetermined target BER, BERT , is set ...
IEEE Transactions on Wireless Communications, 2009
Abstract In this paper, we consider an incremental relaying protocol based on an amplify-and-forw... more Abstract In this paper, we consider an incremental relaying protocol based on an amplify-and-forward transmission in conjunction with the best relay selection scheme over non-identically distributed relay channels. In order to satisfy the spectral efficiency and the bit ...
... Mohamed-Slim Alouini Electrical and Computer Engineering Program Texas A&M Univer... more ... Mohamed-Slim Alouini Electrical and Computer Engineering Program Texas A&M University at Qatar Doha, Qatar alouini@qatar.tamu.edu ... adaptive modulation technique is often employed [7, 8]. In discrete rate adaptive modulation, a predetermined target BER, BERT , is set ...
IEEE Transactions on Wireless Communications, 2009
Abstract In this paper, we consider an incremental relaying protocol based on an amplify-and-forw... more Abstract In this paper, we consider an incremental relaying protocol based on an amplify-and-forward transmission in conjunction with the best relay selection scheme over non-identically distributed relay channels. In order to satisfy the spectral efficiency and the bit ...
IEEE Transactions on Wireless Communications, 2008
Opportunistic relaying with cooperative diversity has been introduced in as a simple alternative ... more Opportunistic relaying with cooperative diversity has been introduced in as a simple alternative protocol to the distributed space-time coded protocol while achieving the same diversity-multiplexing tradeoff performance as a point-to-point multiple-input multiple-output scheme. In this paper, we derive the upper and lower bounds for the cumulative distribution function of the signal-to-noise ratio per hop, and then provide their probability density function and moment generating function.We also derive approximate but tight closed-form expressions for the lower and upper bounds of the outage probability of opportunistic relaying based on decode-and-forward transmission under the assumption of unbalanced/balanced hops and independent, identically distributed Rayleigh fading channels.
In this paper, we propose a low complexity cooperative communication systems with the amplify-and... more In this paper, we propose a low complexity cooperative communication systems with the amplify-and-forward protocol over a multiple distributed relay network where only one relay among relay candidates is selected according to a certain threshold. By setting different values of their threshold, we consider two different relay selection schemes: (i) achieving the maximum spectral efficiency and (ii) minimizing system complexity.
Opportunistic relaying with cooperative diversity has been introduced in as a simple alternative ... more Opportunistic relaying with cooperative diversity has been introduced in as a simple alternative protocol to the distributed space-time coded protocol while achieving the same diversity-multiplexing tradeoff performance as a point-to- point multiple-input multiple-output scheme. In this paper, we derive an upper and lower bound on the per hop output signal-to- noise ratio cumulative distribution function, probability density function and moment generating function. We also derive approximate but tight closed-form expressions for the lower and upper bounds of the outage probability of opportunistic relaying based on decode-and-forward transmission under the assumption of unbalanced/balanced hops and independent, identical distributed Rayleigh fading channels.
In this letter, we propose two-way amplify-and-forward relaying in conjunction with adaptive modu... more In this letter, we propose two-way amplify-and-forward relaying in conjunction with adaptive modulation in order to improve spectral efficiency of relayed communication systems while monitoring the required error performance. We also consider a multiple relay network where only the best relay node is utilized so that the diversity order increases while maintaining a low complexity of implementation as the number of relays increases. Based on the best relay selection criterion, we offer an upper bound on the signal-to-noise ratio to keep the performance analysis tractable. Our numerical examples show that the proposed system offers a considerable gain in spectral efficiency while satisfying the error rate requirements.
In this paper, we consider two-way amplify-and-forward relaying communication over a multiple rel... more In this paper, we consider two-way amplify-and-forward relaying communication over a multiple relays network in which the best relay node is selected among others. Our proposed scheme picks for duplex communication between the source and the destination only the relay which provides the best end-to-end performance based on the instantaneous channel information. Similar to the relay selection method proposed, our scheme also does not require any explicit communications among the relays. Based on the proposed relay selection criterion, we offer the performance bounds on the average sum-rate, average symbol error rate, outage probability over identically, independent distributed Rayleigh fading channels. Further, our numerical examples show that our proposed scheme provides considerable sum-rate gains and offers an increasing a diversity order as the number of relay candidates increases.
... Mohamed-Slim Alouini Electrical and Computer Engineering Program Texas A&M Univer... more ... Mohamed-Slim Alouini Electrical and Computer Engineering Program Texas A&M University at Qatar Doha, Qatar alouini@qatar.tamu.edu ... adaptive modulation technique is often employed [7, 8]. In discrete rate adaptive modulation, a predetermined target BER, BERT , is set ...
IEEE Transactions on Wireless Communications, 2009
Abstract In this paper, we consider an incremental relaying protocol based on an amplify-and-forw... more Abstract In this paper, we consider an incremental relaying protocol based on an amplify-and-forward transmission in conjunction with the best relay selection scheme over non-identically distributed relay channels. In order to satisfy the spectral efficiency and the bit ...
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