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In cognitive multimedia mesh networks (CMMNs), unlicensed users (secondary users, SUs) can share the spectrum with licensed users (primary users, PUs) on a non-interfering basis. The main challenge in CMMN is how to implement an efficient optimal control policy that can allocate spectrum and transmission powers for the SUs efficiently and how to adapt these resources to the changing network conditions...
Nowadays, licensed users (primary users, PUs) can provide a means for offering internet service for unlicensed users (secondary users, SUs). We explore the ability of cognitive mesh network (CMN) to offer quality of service (QoS) required by real time services, streaming multimedia and other applications. We consider the approach where PUs rent the surplus spectrum to SUs to get some reward. However,...
Because PAs used in cell phone handsets operate with a battery supply, a high PAE is essential for battery life. It is also important for thermal management on the handset. Linearity is critical for 3G applications or beyond. In addition, cost, size, and reliability are also very important to consider. Higher and higher on-chip integration using various semiconductor technologies is the key to make...
System modeling has the potential to enhance system design productivity by providing a platform for system performance evaluations. This model must be designed at an abstract level, hiding system details. However, it must represent any subsystem or its components at any level of specification details as needed. In order to model such a system, we will need to combine various models-of-computation...
Networks-on-chip (NoC) are expected to play a key role in future embedded systems. A NoC-based system has the potential to support concurrent processing, in both software and hardware. This can however lead to concurrency issues. We present a multiprocessor system modeling and performance evaluation approach that addresses concurrency. We illustrate our methodology by mapping a H.264 decoder onto...
Alewife is a multiprocessor architecture that supports up to 512 processing nodes connected over a scalable and cost-effective mesh network at a constant cost per node. The MIT Alewife machine, a prototype implementation of the architecture, demonstrates that a parallel system can be both scalable and programmable. Four mechanisms combine to achieve these goals: software-extended coherent shared memory...
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