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In cognitive radio networks, the available spectrum holes are usually discontinuous. Hence, it is hard to exploit these spectrum holes because the bandwidth of an individual one may not be able to satisfy the wide bandwidth requirement imposed by secondary users (SUs). Spectrum aggregation (SA) enables SUs to integrate several spectrum holes into one channel with wide bandwidth which may support high...
In this paper, a class of dynamic networks that widely exist in nature, such as signaling networks in cells, is modeled as a controller, in which the quantitative relation among principal factors is explicitly given. A reduction method with respect to the controller is proposed to transform a dynamic network into a minimum controller with only two variables and two units: a feedforward unit and a...
The H.264/AVC video coding standard shows high coding efficiency compared to previous video coding standards by applying new coding features. However, due to the exhaustive rate-distortion optimization (RDO) based mode decision process, the computational complexity of the encoder greatly increases. In this paper, a fast mode decision algorithm for spatial direct mode in B slice in H.264 standard is...
This paper presents an on bit allocation and Lagrange multiplier (lambdaMODE) adjustment for H.264 rate control. To enhance the precision of the complexity estimation and bit allocation, a frequency-domain parameter named mean-absolute-transform-difference (MATD) is adopted to represent frame and macroblock (MB) residual complexity. Second, the MATD ratio is utilized to enhance the accuracy of frame...
In H.264/AVC standard, the improvement of motion estimation (ME) part helps to enhance the performance greatly. However, the ME part, especially the integer motion estimation (IME) occupies computation complexity dramatically, which leads to complexity in hardware implementation. Many works have been done to achieve efficient IME engine and propagate partial SAD (PPSAD) architecture is the most efficient...
The search range (SR) parameter plays an important role in motion estimation (ME) for video coding. Adaptively adjusting SR according to the information given by previously encoded syntax element, also known as adaptive search range (ASR) algorithm, can efficiently reduce the computational complexity of ME. Compared with heuristic search pattern (HSP) algorithms like diamond/hexagon search, ASR algorithms...
In this paper, the information-theoretical formalization is presented, in which the signaling pathways are formulated in terms of linear network coding, as a preliminary step to modeling the intracellular communication processes in cells by information theory, and the cellular communication protocol (on MAPK cascade) is discussed based on network coding. In addition, the computational complexity of...
Although molecular signaling of phosphorylation/dephosphorylation-proteins and GTPases has been extensively studied in molecular biology, it is still an open problem as to how information be coded in these molecules for molecular communication. In this paper, we propose a new channel coding algorithm based on signaling pathways in cells, extending our previous work on source codes to channel codes...
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