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In free-space optical communication, aperture averaging effect can be used to optimize receiver design. A variety of factors contribute to aperture averaging effect, such as the receiving aperture, the light source, and the turbulence link. Cassegrain system is usually used as the receiver. It is technically feasible to optimally design the light source according to Cassegrain system's aperture averaging...
As microwave spectrum becomes increasingly scarce, millimeter wave communication has gained wide attention for its sufficient bandwidth, which is also considered as one of the key technologies in the Fifth Generation (5G) communication networks. Different from microwave, millimeter communication is easy to suffer from the blockages. In order to take advantage of the wide spectrum and avoid the big...
For high-frequency radar, ship targets detection is seriously affected by the strong sea clutter. To solve the problem, a design of multi-frequency radar receiver system is presented, which completes digital mixer and digital down converter for multi- channel digital receivers based on FPGA and carries out system controls and data transmission by USB2.0 interface. The system closed-loop test shows...
Today, Intelligent Transportation System (ITS) applications has made a great impact on improving the quality and efficiency of the transportation system. This achievement has attracted researchers to propose more ITS applications, particularly to improve the transportation safety through Vehicular Ad Hoc Networks (VANETs). The major difficulty faced by these researchers is the verification of their...
Spectrum-agile radios, also known as cognitive radios, have a great potential to improve spectrum utilization by enabling dynamic access to the spectrum. A key challenge in operating these radios is how to implement an efficient medium access control (MAC) mechanism that adaptively and efficiently allocates transmission powers and spectrum according to the surrounding environment. In this work, we...
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