tailieunhanh - Performance analysis of cooperative based multi hop transmission protocols in underlay cognitive radio with hardware impairment

n this paper, we study performances of multi-hop transmission protocols in underlay cognitive radio (CR) networks under impact of transceiver hardware impairment. In the considered protocols, cooperative communication is used to enhance reliability of data transmission at each hop on an established route between a secondary source and a secondary destination. | VNU Journal of Science: Comp. Science & Com. Eng., Vol. 31, No. 2 (2015) 15–28 Performance Analysis of Cooperative-based Multi-hop Transmission Protocols in Underlay Cognitive Radio with Hardware Impairment Tran Trung Duy*, Vo Nguyen Quoc Bao Wireless Communication Lab, Posts and Telecommunications Institute of Technology (PTIT), Vietnam Abstract In this paper, we study performances of multi-hop transmission protocols in underlay cognitive radio (CR) networks under impact of transceiver hardware impairment. In the considered protocols, cooperative communication is used to enhance reliability of data transmission at each hop on an established route between a secondary source and a secondary destination. For performance evaluation, we derive exact and asymptotic closed-form expressions of outage probability and average number of time slots over Rayleigh fading channel. Then, computer simulations are performed to verify the derivations. Results present that the cooperative-based multi-hop transmission protocols can obtain better performance and diversity gain, as compared with multi-hop scheme using direct transmission (DT). However, with the same number of hops, these protocols use more time slots than the DT protocol. c 2015 Published by VNU Journal of Sciences. Manuscript communication: received 01 May 2015, revised 10 June 2015, accepted 25 June 2015. Corresponding author: Tran Trung Duy, trantrungduy@. Keywords: Hardware Impairment, Underlay Cognitive Radio, Cooperative Communication, Outage Probability. 1. Introduction In wireless networks such as adhoc networks [1] and wireless sensor networks [2], multihop relaying scenarios are used widely due to far distances between source node and destination node. In conventional multi-hop scheme, the direct transmission (DT) is used to relay the source’s data to the destination [3, 4]. Although the implementation of the DT protocol is easy in practice, its performance significantly degrades in fading .