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In cognitive radio networks, the idle spectrum bands that cognitive users sensed are usually discontinuous. Only one idle spectrum band may not be able to fulfill cognitive users' bandwidth requirements. In order to let cognitive users access allocated spectrum bands successfully and further improve the efficiency of spectrum utilization, we propose spectrum aggregation-based graph coloring algorithm...
As the loss probability could be the indicator of congestion possibility, the theoretical study of air traffic network was how to determinate active queue management (AQM) based on random condition. Then, a random early detection (RED) method for air traffic network was proposed, which determined the soft loss strategy with deducing the maximum threshold and average queue length. Compared to the existing...
A GPS receiver based on FPGA and MicroBlaze was developed. This kind of GPS receiver is made up of a RF Front- End and FPGA, with NemeriX NJ1006A and Xilinx XC2VP30 as its core chips. The RF Front-End chip NJ1006A receives the GPS signal and converts it to IF signal which is transfered to FPGA .The correlators array , C/A code generator,C/A code DCO and carrier DCO were analyzed and designed with...
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