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Fountain codes which have been utilized extensively in deep-space communication can solve the problems, such as the asymmetry between the uplink and downlink, the enormous time delay and long distance. LT codes are the first codes fully realizing the digital fountain concept. The girth of the generator matrix is a key element, and short cycles in the generator matrix cause the degeneration of performance...
Routing of packets in networks requires that a path will be selected either dynamically while the packets are being forwarded, or statically (in advance) as in source routing from a source node to a destination. The genetic algorithms which has been applied to routing optimization problem is difficult because network is not a widely connectivity network. If we use traditional GA, it may generate some...
In this paper, an ultra-high-speed, differential current-steering mode 10-bit D/A converter is presented. The converter consists of 8-channel time division multiplexer, 5-31 ??thermometer?? decoder, fast current conversion switch, constant current source array, and other units, is processed in 0.35 ??m SiGe BiCMOS standard process technology, and has a data fresh rate of up to 1 GSPS. First, the circuit...
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