Rami Mohaisen

Performance evaluation of multiuser diversity in multiuser two-hop cooperative multi-relay wireless networks using maximal ratio combining over Rayleigh fading channels

Multiuser diversity MUD cooperative wireless networks combine the features of the MIMO systems without confronting the physical layer constraints by providing multiple copies of the transmitted signal from the source to the destination with the help of the relay node. Cooperative wireless networks have attracted the full attention in the last few years and are implemented widely in many wireless communication systems to adapt for the fading impairments, provide higher data rates, and improve the performance of the wireless communication systems. In this paper, we present an informative study for the reason of evaluating the performance of the MUD in the multiuser two-hop cooperative multi-relay networks using maximal ratio combining. Furthermore, we derive tight closed-form expressions of outage probability and symbol error probability for the amplify-and-forward and fixed decode-and-forward protocols with the MUD. Additionally, we conduct a simulation study to show to what extent our analytical and simulation results agree with each other. It is worthy to mention that our analytical and simulation results agree fairly with each other under high average signal-to-noise ratio, whereas they show that our proposed system with multiple relays provides significant improvements over those previously proposed systems having only one relay. Copyright

Closed-form expression for bit error rate in relay-based cooperative diversity systems over multipath fading channels with interference

Incremental relaying has been recently introduced to overcome the problem with the restricted resources utilization associated with fixed relaying schemes in a pre-determined manner. Only when the direct path is not usable, the incremental relaying exploits the feedback from the destination to inform the relay about the necessity to send the source signal. In this paper, the performance analysis in terms of the bit error rate (BER) of the decode-and-forward (DF) incremental relaying over mixed fading channels is provided. The effects of the Co-channel interference near the destination caused by the multiple L interferers are presented. Numerical results are provided to prove the solidity of our assumptions.

Closed-form expression for outage probability in relay-based cooperative diversity systems over multipath fading channels with interference

Incremental relaying has been recently proposed to overcome the restriction associated with the fixed relaying schemes by restricting the usage of the relay(s) only when the channel conditions are severe regarding the channel impairments. The incremental relaying exploits the feedback from the destination to inform the relay about the necessity to send the source signal, only when the direct path is not usable the destination will combine the two received signals by maximal ratio combiner (MRC) to enhance the reception of the signal. In this paper, the performance analysis in terms of the outage probability (OP) of the incremental relaying over mixed fading channels is provided for the decode-and-forward (DF) protocol and incorporates the effects of the multiple L interferers near the destination which in turn will degrade the overall performance of the system. Numerical results are provided to validate our derivations.

BER analysis in relay-based DF cooperative diversity systems with relay & destination interferers

Incremental relaying has been recently introduced to overcome the problem with the restricted resources utilization associated with fixed relaying schemes in a pre-determined manner. Only when the direct path is not usable, the incremental relaying exploits the feedback from the destination to inform the relay about the necessity to send the source signal. In this paper, the performance analysis in terms of the bit error rate (BER) of the decode-and-forward (DF) incremental relaying over mixed fading channels is provided. The effects of the Co-channel interference near the destination and the relay caused respectively by the multiple L and N interferers are presented. Numerical results are provided to prove the solidity of our assumptions and compare the results of the system with and without the effects of the interference at the relay.

Closed-form expression for outage probability in relay-based cooperative diversity systems over Nakagami fading channels with interference

Incremental relaying was firstly introduced in order to compensate for the deficiencies associated with the regular cooperative schemes, namely, the fixed relaying schemes where the node helps the source in relaying its signal to the destination regardless of the channel conditions. In this paper, the performance of a two-hop Decode-and-Forward incremental relaying over Rayleigh fading channels with the presence of the multiple L interferers located near the destination which will degrade the overall behavior of the system taking into consideration that the fading channels from the interferers to the destination is assumed to be a sum of identically and independently distributed Rayleigh random variables is introduced.

On the outage probability in DF relay selection cooperative wireless networks over Nakagami-m fading channels

This paper proposes a method for transmitting data through a best relay selection technique in a cooperative network over Nakagami-m fading channels. The selection of the best relay among multiple decode and forward relays is based on the minimum outage probability criterion. Therefore, only the relay with the lowest outage probability will transfer the data to the destination. A closed-form expression is derived for the outage probability of the best relay selection with the decode and forward technique. Numerical examples are presented here for demonstration.

Outage probability analysis in relay-based DF cooperative diversity systems with relay & destination interferers

Incremental relaying was firstly introduced in order to accommodate for the restriction associated with the fixed relaying schemes by using the intermediate relays only when they are needed by using a feedback from the destination to determine whether or not to use the relay which depends mainly on the usability of the direct path between the source and the relay. When the relay receives this negative feedback from the destination then it will send the signal to the destination within the second time slot which by then will be combined with the source signal using MRC, and by this, the system resources will be utilized efficiently. This paper provide the performance analysis of a decode-and-forward incremental relaying cooperative relaying over Rayleigh and Nakagami-m mixed fading channels with the presence of multiple interferers L and N near the destination and the relay respectively, which in turn will degrade the overall system performance and also compares the system performance with and without the presence of the interferers near the relay. Numerical results are provided to validate our assumptions.

Performance Evaluation of Bit Error Rate in Relay-Based Cooperative Diversity Systems over Rayleigh Fading Channels with Interference

Adaptive relaying schemes of the cooperative diversity networks have drawn a considerable attention since they provide an efficient way in allocating the channel resources effectively when needed. The incremental relaying form of the cooperative networks uses a feedback channel from the destination in order to use the relay only when the direct path from the source to the destination is in outage which in turn will combine the two received signal by the maximum ratio combiner (MRC) to proactively improve the signal reception at the destination. This paper derives a closed form expression for the bit error rate (BER) in decode-and-forward incremental relaying systems over Rayleigh fading channels and incorporating the effects of the multiple L interferers near the destination which will degrade the system performance due to the Co-channel interference. Numerical results are provided to consolidate the assumptions.