QoS of cognitive and primary networks and spectrum sensing tradeoff using always transmit strategy over Nakagami-m fading channels

Trans. Emerging Tel. Tech.

Haqiq

2016

Self Cite

The next‐generation 5G networks will integrate two technologies, cognitive radio and cooperative communication, which use radio spectrum opportunistically and efficiently. In addition, they enhance the reliability and the capacity of the system. In this paper, we present a novel power control scheme based on a relaxed constraint in cognitive network under both the outage probability limit (OPL) of the primary system and the interference constraint limit (ICL). We show how to transform the optimization problem of the condition on the OPL and the ICL into a condition on the channel so that the cognitive user observes the channel from cognitive source to primary receiver and control its transmit power based on the channel condition. Moreover, we extend the studies to the cognitive relay network. We derive the closed‐form expressions of the outage probabilities over independent but not necessarily identically distributed Nakagami‐m fading channels. By using the theoretical analysis and from the numerical results, firstly, we show that the proposed power control scheme, which is based on both the OPL and the ICL, achieves better performance in underlay spectrum rather than the traditional one, which is based only on the interference constraints. Secondly, we show that the proposed scheme allows lower power consumption at cognitive side while the performance of cognitive relay network is improved, and the QoS of primary system is guaranteed in parallel. Copyright © 2016 John Wiley & Sons, Ltd.

Section: Introductionmentioning

confidence: 99%

“…The second metric in restricts the interference power on the requirement of a minimum transmission rate in terms of signal to interference plus noise ratio (SINR) of the primary system. The third metric in restricts the interference power on the basis of the OPL that limits the maximum outage/degradation of the primary system.…”

Section: Introductionmentioning

confidence: 99%

A novel power control based on a relaxed constraint in cognitive system

Trans. Emerging Tel. Tech.

Haqiq

2016

Self Cite

“…The second metric in [6] restricts the interference power on the requirement of a minimum transmission rate in term of SINR of the primary system. The third metric in [7] [8] restricts the interference power on the basis of the OPL that limits the maximum outage/degradation of the primary system. However, measure the QoS at primary system only by ICL is better for primary system, since it is protected instantaneously from cognitive network.…”

Section: Introductionmentioning

confidence: 99%

Relaxed constraint at cognitive relay network under both the outage probability of the primary system and the interference constraint

2015 European Conference on Networks and Communications (EuCNC)

Haqiqk

2015

Self Cite

The next-generation 5G networks will integrate two technologies, cognitive radio and cooperative communication, which use radio spectrum opportunistically and efficiently, in addition, they enhance the reliability and the capacity of the system. In this paper, we present a novel power control scheme based on a relaxed constraint at cognitive relay network under both the outage probability limit (OPL) of the primary system and the interference constraint limit (ICL). We show how to transform the optimization problem of the condition on the OPL and the ICL into a condition on the channel, so that the cognitive user observes the channel from cognitive source to primary receiver, and control its transmit power based on the channel condition. We derive the closed-form expressions of the outage probabilities over independent but not necessarily identically distributed Nakagami-m fading channels. By using the theoretical analysis and from the numerical results, firstly, we show that the proposed power control scheme which based on both the OPL and the ICL achieves better performance in underlay spectrum rather than the traditional which based only on the interference constraints. Secondary, we show that the proposed scheme allows lower power consumption at cognitive side while the performance of cognitive relay network is improved and the QoS of primary system is guaranteed in parallel.Index Terms-Cognitive relay network, interference constraint limit, outage probability limit, spectrum underlay, power control, Nakagami-m Fading.

“…Motivated by cooperative communications and our results in [17,18], in this paper, we extend our strategy ' AT' (the cognitive source (CS) will be able to transmit over all time slots and in any time slot, then, it will be able to operate continuously whenever either the primary user is active or absent) into cognitive relay selection. We derive the closed form of outage probability of relay selection in dual-hop transmission over independent but not necessarily identically distributed (i.n.i.d.)…”

Section: Introductionmentioning

confidence: 99%

“…In our previous works [16], where we have introduced our new strategy of transmission 'Always Transmit (AT): to enhance the cognitive sources of data transmission and to provide continuous transmit solution by using mixed strategies in cognitive radio context, which it performed via the combination of the underlay and interweave approaches depending on the activity of the primary system' and have shown that it outperforms other conventional cognitive radio strategies for power transmission and interference management, in [17], where we have derived the closed form and analyzed the performance of outage probability over Rayleigh fading, and in [18], where we have studied the trade-off between spectrum sensing duration and the QoS at cognitive network while guaranteeing certain QoS at primary network controlled by the outage probability limit, over independent but not necessarily identically distributed Nakagami-m channels. In (M Ridouani, A Hayar, A Haqiq, Continuous-transmit in cognitive radio systems: perform sensing and transmission in parallel anytime.…”

Section: Introductionmentioning

confidence: 99%

Continuous transmit in cognitive radio systems: outage performance of selection decode-and-forward relay networks over Nakagami-m fading channels

Haqiq

2015

J Wireless Com Network

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Cognitive radio is a promising technology that uses radio spectrum opportunistically and efficiently. In this paper, we present the performance of 'Always transmit' strategy, which consists of allowing the cognitive source to transmit over all time slots and in any time slot. Thus, the cognitive source will be able to operate continuously whenever either the primary user is active or absent. The proposed strategy is projected into dual-hop communication systems with decode-and-forward and relay selection over independent but not necessarily identically distributed Nakagami-m fading channels. We derive the closed-form expressions of the outage probability, and we analyze the performance. Simulation results show that the strategy 'Always transmit + Relay' outperforms other conventional cognitive radio strategies and the use of relays enhances the performance in deep fading channel.