Abstract
Multimedia content delivery, such as video transmission over wireless networks, imposes significant challenges include spectrum capacity and packet losses. The cognitive radio (CR) technology is developed to solve the spectrum issue, while multiple description coding (MDC) is one of the promising source coding techniques to alleviate packet loss problems and exploit the benefit of path diversity. The source information was split into several descriptions in MDC, then transmitted over a network with multiple paths. The quality of the received data increases with the number of descriptions received at the receiver. In this paper, the proposed system comprises of relay-assisted cognitive radio network using the MDC technique for video transmission. In the simulations, the outage performance of the MDC scheme over two networks, which were relay-assisted network and non-relay network, were compared. Then, the outage probability was used to estimate the video quality, peak signal to noise ratio (PSNR) of the received video. The results obtained show the benefits of the relay assisted networks by 9% improvement on average outage performance over the non-relay network. Furthermore, the video performance improved by an average of 9% in PSNR compared to the non-relay system.
Highlights
M ULTIMEDIA services are growing fast as heterogeneous communication networks
The peak signal to noise ratio (PSNR) using RC-multiple description coding (MDC) has an improvement of 6% for the Suzie sequence and 9% for the Foreman sequence compared to the non-relay network
This approach uses the MDC technique combining with the relay-assisted network to exploit the path diversity benefits
Summary
M ULTIMEDIA services are growing fast as heterogeneous communication networks. The number of users using higher bandwidth services such as video streaming is skyrocketing in popularity. In CR, an unlicensed user known as the secondary user (SU) is allowed to utilise the spectrum when there is an absence of a licensed user, known as primary user (PU), or co-located with the presence of PU These scenarios are called interweave and underlay modes of CR. The focus of the paper was to investigate the outage and analyse the video performance by maximising the benefits of the following; (i) the exploitation of path diversity via a relay-assisted network over CR; (ii) MDC as the source coding technique to mitigate packet losses; (iii) the combination of multipath relaying with MDC to combat noise. The estimation of the PSNR is measured, and the video performance is analysed using the outage probability investigated in the previous contribution This analysis provides new insight into the benefits of combining the relay-assisted network and the MDC technique.
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