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In this paper, we propose a cognitive protocol that involves cooperation between the primary and secondary users. In addition to its own queue, the secondary user (SU) has a queue to store, and then relay, the undelivered primary packets. When the primary queue is nonempty, the SU remains idle and attempts to decode the primary packet. When the primary queue is empty, the SU splits the total channel...
This paper proposes a cooperation protocol between a secondary user (SU) and a primary user (PU) which dedicates a free frequency subband for the SU if cooperation results in energy saving. Time is slotted and users are equipped with buffers. Under the proposed protocol, the PU releases portion of its bandwidth for secondary transmission. Moreover, it assigns a portion of the time slot duration for...
A single cognitive radio transmitter-receiver pair shares the spectrum with two primary users communicating with their respective receivers. Each primary user has a local traffic queue, whereas the cognitive user has three queues; one storing its own traffic while the other two are relaying queues used to store primary relayed packets admitted from the two primary users. A new cooperative cognitive...
In a recent paper, we demonstrated the minimization of instantaneous energy in a two-way relay network with digital network coding at the relay, through the optimization of the time-sharing fractions for each mode of transmission. In that work, the channel gains were assumed to be changing so slowly with time that queue stability required instantaneous channel throughput to be no smaller than the...
This paper elaborates about the potential risks of systemic instabilities in future networks and proposes a methodology to control and mitigate them. The starting concept is modeling the network as a complex environment (e.g. ecosystem) of resources and associated controllers in a continuous and dynamic game of cooperation and competition. Key observation is that Internet might be viewed as “self-organizing”...
IPTV is an emerging multimedia network application over prevalent Internet. IPTV over P2P streaming network preserves significant advantages in scalability over conventional client-server architecture. IPTV media content delivered in P2P networks over public Internet still preserves the issues of privacy and intellectual property. In this paper, we use SIP protocol to construct a secure application-layer...
As a result of the independence, opacity and complication of inter-domain routing policy deployment among different ASes, negative impact on global Internet might be introduced. By presenting one case occurred in TEIN2 backbone, we point out the potential performance and stability problems caused by inappropriate policy design and amendment, which might cause side effect on particular application,...
This paper provides a short review of radio frequency/microwave power amplifiers (PAs) and their critical role in a modern satellite communication system. Authorspsila original design contributions are also highlighted.
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