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The bandwidth in wireless networks is usually shared by a number of wireless nodes. The channel capacity depends on the number of accessing nodes, time, environmental conditions and location of nodes. Due to varying channel conditions, several issues are observed in the transmission of real time multimedia. The existing research on multimedia streaming can be classified into adaptation techniques...
This paper studies TCP performance when running over a wireless network that implements cooperative communications. Two well-known cooperative communications schemes were considered: Amplify-and-Forward and Decode-and-Forward. Also, two cross-layer cooperative communications schemes that leverage on the link layer retransmission scheme were considered. These schemes transmit the message from the cooperating...
The cognitive framework, which fosters an efficient use of the channel resource by granting access to smart and adaptive terminals, has been recently integrated with the cooperative paradigm. Accordingly, following a spectrum-leasing approach, licensed (primary) users may let unlicensed (secondary) users access the owned bandwidth in exchange for an increased performance via cooperation. Nevertheless,...
Future mobile communications systems demand for higher data rates and service quality compared to state-of-the-art systems. One way to achieve this ambitious goal is to use relaying which improves channel conditions by adding one or more intermediate nodes to support communication pairs. As relays do not rely on a wired backhaul, they can be flexibly deployed while keeping infrastructure costs lower...
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