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Efficient and robust wireless video delivery is an enabling technology for various applications. The existing wireless video transmission scheme has the cliff effect and it cann't gracefully adapt to channel variations. In this paper, we introduce a pseudo-analog wireless video transmission improvements and design in the hardware. Comparing with the traditional transmission, the linear processing...
In cognitive radio networks (CRNs), the spectrum utilization can be dramatically improved with the secondary users (SUs) accessing the unoccupied licensed channels opportunistically. However, how to fully utilize the spectrum holes to meet the quality of service requirements of SUs is still an open issue. In this paper, we focus on multi-user, multi-channel case, and analyze the stable channel state...
Hybrid Digital-Analog (HDA) transmission has been proved to be an effective technique to overcome the “cliff effect” in wireless video communication. In this paper, we propose a novel HDA modulation scheme. The phase of modulation symbol is used to carry the digital signal while the amplitude of modulation symbol is used to carry analog signal. In order to make full use of channel capacity, the bit...
A broadband low profile microstrip filter-antenna with an omni-directional pattern is presented. A coupled line is used to connect a microstrip antenna and the second resonator of a filter as admittance inverter. In the design, the antenna performs as a radiator; meanwhile it is also the last resonator of the bandpass filter. Therefore, the loss is reduced between the filter and the microstrip antenna...
Random projection code (RPC) is a promising technique to implement the rate adaption in modern wireless communication system. This paper introduces RPC to decode-and-forward relay channel system, and proposes a scheme of distributed RPC (DRPC) with rate adaption nature. In this paper, we discuss how to demodulate and decode signal jointly for DRPC. Finally, we evaluate DRPC schemes by an evaluation...
Wireless Mesh technology is a very promising new type of broadband wireless access network technology. This paper briefly introduces the basic principles and structure of wireless Mesh first, then describes a Mine wireless communication system based on wireless Mesh technology. The system gives a detailed design of networking mode and wireless routing mine wireless communication, and analyzes and...
A major obstacle of wireless energy harvesting is to convert relatively low power wireless RF energy into sufficiently high DC voltage for practical use. This paper explores and studies a topology where several voltage doublers are connected in series to boost up the DC output voltage from the wireless energy harvesting circuits. A prototype has been designed and fabricated to test the feasibility...
The clustering communication sensor network structure is a main energy efficient communication protocol. The cluster heads collect information transmitted from the cluster members to process the data in the base station far beyond. In this structure, the unstable and unevenly distributed cluster heads can increase power of the network system. In this paper, we propose a energy efficient cluster head...
Based on the ZigBee wireless network, a park lighting control and child location tracking system is designed in this paper. Considering that there may be a number of children that needs to be tracked concurrently, distributed localization is needed, so an improved RSSI-based algorithm is introduced in this paper. As a goal of our system, the new method, unlike commercial digital-hardware-block based...
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