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Exact Outage Analysis of Underlay Cooperative Cognitive Networks with Reactive Relay Selection Under Imperfect Channel Information

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Abstract

This paper investigates the effect of imperfect channel information on the outage performance of underlay cooperative cognitive networks with reactive relay selection under both primary outage constraint and maximum transmit power constraint. Towards this end, we firstly propose a power allocation scheme for secondary users to meet both constraints and take into account channel estimation error. Then, based on this scheme we propose an exact closed-form outage probability expression for secondary networks. This expression facilitates in quickly assessing the performance behaviour of underlay cooperative cognitive networks with reactive relay selection in different aspects and provides useful insights into the system performance. Various results show considerable system performance degradation due to imperfect channel information, a performance trade-off between the secondary network and the primary network, the performance saturation phenomenon in the secondary network, and the significant performance improvement with respect to the increase in the number of relays.

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Notes

  1. This paper focuses on DF relays in underlay cooperative cognitive networks, and hence, relay selection schemes with AF relays (e.g., [25, 34, 35]) or in underlay dual-hop cognitive networks (e.g., [7, 2628]) are not necessarily surveyed.

  2. The effect of channel estimation error in underlay cognitive networks was investigated in different aspects. More specifically, the authors in [31] studied direct transmission (i.e., no relay); [32, 33] considered the AF relay selection; the authors in [3942] investigated relay non-selection. The literature related to these aspects studied in [3133, 3942] should not be further surveyed since this paper concentrates underlay DF cognitive networks with relay selection.

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Acknowledgments

This research is funded by Vietnam National Foundation for Science and Technology Development (NAFOSTED) under Grant Number 102.04-2014.42.

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Correspondence to Khuong Ho-Van.

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Ho-Van, K. Exact Outage Analysis of Underlay Cooperative Cognitive Networks with Reactive Relay Selection Under Imperfect Channel Information. Wireless Pers Commun 84, 565–585 (2015). https://doi.org/10.1007/s11277-015-2650-5

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