Charles Pandana

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In this paper, we study the impact of cooperative routing for maximizing the network lifetime in sensor network applications. We assume nodes in the network are equipped with a single omnidirectional antenna and they perform cooperative transmission to achieve transmit diversity. We propose a joint cooperative transmission and energy aware routing algorithm(More)
Cognitive radio has been proposed as a novel approach for improving the utilization of the precious limited radio resources by dynamically accessing the spectrum. One of the major design challenges is to coordinate and cooperate in accessing the spectrum opportunistically among multiple distributive users with only local information. In this paper, we(More)
We consider the problem of average throughput maximization per total consumed energy in packetized sensor communications. Our study results in a near-optimal transmission strategy that chooses the optimal modulation level and transmit power while adapting to the incoming traffic rate, buffer condition, and the channel condition. We investigate the(More)
For networks with packet forwarding, distributed control to enforce cooperation for node packet forwarding probabilities is essential to maintain the connectivity. In this paper, we propose a novel self-learning repeated game framework to optimize packet forwarding probabilities of distributed users. The framework has two major steps: first, an adaptive(More)
In this paper, we consider a class of energy-aware routing algorithm that explicitly takes into account the connectivity of the remaining sensor network. In typical sensor network deployments, some nodes may be more important than other nodes because the failure of these nodes causes the network disintegration, which results in early termination of(More)
In wireless ad hoc networks, autonomous nodes are reluctant to forward others’ packets because of the nodes’ limited energy. However, such selfishness and noncooperation deteriorate both the system efficiency and nodes’ performances. Moreover, the distributed nodes with only local information may not know the cooperation point, even if they are willing to(More)
This paper presents a data-loading technique that jointly considers the effect of channel estimation and the property of encoded multimedia data in Orthogonal Frequency Division Multiplexing (OFDM) systems. We observe that OFDM subchannels experience different average bit error rate (BER) due to channel estimation inaccuracy. The leakage effect in the fast(More)
In this paper, we consider the energy-aware routing algorithm that explicitly takes into account the connectivity of the sensor networks. In typical sensor network deployment, some nodes may be more important than other nodes because the death of these nodes cause the network disintegration. The network disintegration causes early termination of information(More)
Abmac-OrIhqonal Frequency Division Multiplexing (OFDM) modulatlon, adopted by the L%@tal Video Broadcasting (DVB-T) standard, has been remgniml for its good performance for high data rate wireless communications. Therelore, the study ofthe robust transmission of multimedia data over OFDM system bas attracted e d d v e research interests. In the past,(More)
. . oimullimedia data, Ihr proposed scheme can improve the Peak-SignalIo-Noise-Ratio (PSNR) oireconstrurled imaxes by sip lo RIB. patterns nre introduced and the mean square channel estiination error (MSE) of diffcerent OFDM subchannels is derived. Furthermore, we propose the Priority Transmission (PT) scheme, which provides unequal emor protectioii for(More)