1,721,412 research outputs found
Improving the energy efficiency of CDMA power control over frequency-selective channels
No full textIn this letter, we derive an energy-efficient power control for the uplink of a code division multiple access (CDMA) wireless network over a frequency-selective and slow-fading channel, in which terminals already code-locked to the base station coexist with some terminals still in the code alignment stage. This formulation is obtained through the application of a generalized noncooperative game with strict incomplete information. This framework allows us: i) to capture the tradeoff between saving as much energy as possible and obtaining good performance, whose metrics depends on each terminal's operational status; and ii) to derive a low-complexity distributed algorithm, based on iterative best-response dynamics, which increases the performance of the network in terms of received information bits per energy consumed at the transmit side. This improvement, that highly depends on the system parameters and the network traffic characteristics, can range up to 40%. © 2013 IEEE
Energy-efficient power control for CDMA code acquisition over frequency-selective channels
No full textA distributed, energy-efficient power control algorithm for the uplink of a CDMA wireless data network over a frequency-selective and slow-fading channel is derived through the application of noncooperative game theory, focusing on the issue of initial code synchronization. To capture the tradeoff between obtaining good synchronization performance and saving as much energy as possible, we derive a distributed criterion to properly set the receiver decision threshold and the transmit power, using the generalized Nash solution, and we propose a practical algorithm, based on iterative best-response dynamics. © 2011 IEEE
Attirer, arrêter, attacher: il cinema di Nano Campeggi (1946-1969) / Attirer, arrêter, attacher: Nano Campeggi’s cinema (1946-1969)
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Measurable Stochastics for Brane Calculus
Full text linkWe give a stochastic extension of the Brane Calculus, along the lines of recent work by Cardelli and Mardare. In this presentation, the semantics of a Brane process is a measure of the stochastic distribution of possible derivations. To this end, we first introduce a labelled transition system for Brane Calculus, proving its adequacy w.r.t. the usual reduction semantics. Then, brane systems are presented as Markov processes over the measurable space generated by terms up-to syntactic congruence, and where the measures are indexed by the actions of this new LTS. Finally, we provide a SOS presentation of this stochastic semantics, which is compositional and syntax-driven
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