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As the demand for structure healthy monitoring of civil engineering continues to grow at an unprecedented pace, the need for real time remote data compression and transmission systems becomes more prominent. In this paper, aiming at the problem of massive data transmission in the safety monitoring systems of the civil engineering applications, the GPRS wireless transmission terminal is designed to...
Cloud Radio Access Networks (RANs) have become a key enabling technique for the next generation (5G) wireless communications, which can meet requirements of massively growing wireless data traffic. However, resource allocation in cloud RANs still needs to be further improved in order to reach the objective of minimizing power consumption and meeting demands of wireless users over a long operational...
We propose and experimentally demonstrate a cell grouping method to improve frequency-reused millimeter-wave coverage. The method provides a 3.5-dB improvement on signal quality and power budget in a field test on a three-transmitter radio-over-fiber system.
Wireless power transfer is an essential technology to increase implants’ longevity. A pair of inductivelycoupled coils operating at radio-frequency is extensively used to deliver electrical power to implants wirelessly. In this system, a power conditioning circuit is required convert the induced time-varying AC power harvested by the receiving coil to a stable DC power that is needed for powering...
Multiple antenna signals in wireless communication system form into a kind of multiple dimension array signal from the view of time, frequency and space factors which can be modelled and processed by tensor analysis method. This paper focuses on the application of PARAFAC-based tensor decomposition method in solving the problem of signal blind recovery in MIMO-OFDM wireless communication system. The...
This paper presents a high efficiency comparator-based CMOS rectifier for wireless power transfer in biomedical implant devices. By using a novel ON-OFF compensation technology, the conduction time of the switch can be optimized and the reverse current has been reduced efficiently. The proposed rectifier was verified using a standard 0.18μm CMOS process. Results shows that the rectifier can achieve...
Traditional macro-cell networks are experiencing an explosion of data traffic, and small-cell can efficiently solve this problem by efficiently offloading the traffic from macro-cells. Given massive small-cells deployed in each over-crowed macro-cell, their aggregate power consumption (though low for an individual) can be larger than that of a macro-cell. To reduce the total power consumption of a...
We have proposed and successfully demonstrated a new architecture of MMW RoF system with wavelength reuse to deliver VHT data/video services. Based on PolM-to-IM conversion, frequency multiplied MMW (54.8-GHz) and intensity-free OC with slight phase fluctuation were received by adjusting PCs. 1.0-Gb/s OOK DS signal has been transmitted over 25-km SMF and air links. Meanwhile, successful transmission...
Nonlinear intermodulations (IMs) between subcarriers from multiple bands/channels of OFDM signals in radio-over-fiber systems are investigated for the first time. Both intra-channel and interchannel IMs are characterized theoretically and experimentally. Pre-distortion technique is proposed and demonstrated for nonlinearity mitigation.
Mobile traffic is growing exponentially and various kinds of traffic are emerging. It is hard to support new communication mechanisms in current cellular networks due to their inflexibility. And since link capacities are fairly close to the Shannon limit, further improvements seem to be expensive and will provide limited gains. As a result, people are working on redesigning cellular networks with...
Providing electrical power to an implantable microelectronic device (IMD) via wireless power transfer technology is critical to implant's efficacy. The inductive coupling based wireless power transfer technology has been the primary approach to remotely power an IMD [1]. Reducing the coil size and improving efficiency are the two primary design goals for the power harvesting component in an IMD. A...
A cloud computing access network architecture based on millimeter-wave radio-over-fiber technologies has been proposed and demonstrated. Real-time communication between centralized computing resources and mobile wireless users are provided by bidirectional millimeter-wave over fiber links.
Spatial Channel Models (SCM) used in wireless system simulations are determined by Large-Scale Parameters (LSP). LSPs include delay spread, shadow fading, angle of arrival and departure spread, and Rice K for line-of-sight channels. LSPs are modeled as a spatially correlated random field over the geometry of the network scenario being simulated. The general method is to generate an LSP map on a discrete...
We propose a multiband 60-GHz radio-over-fiber (RoF) system to offer converged legacy and multi-gigabit wireless services. Real-time WiFi and 1-Gb/s OOK data over fiber and 60-GHz wireless propagation has been demonstrated for the first time.
The security of the three-phase two-way relaying system with an eavesdropper is investigated in this paper. A cooperative jamming and power allocation scheme is proposed to enhance the system secrecy capacity. When a source node transmits user signals to the relay node, the other source node interferes the relay node with pre-defined jamming signals simultaneously. Optimum power allocation between...
In this paper, a two-way relay channel is considered, where two sources transmit information to each other with the help of a half-duplex decode-and-forward (DF) relay. We investigate the energy efficiency (EE) for the DF two-way relay transmission (TWRT). The EE expression is derived first and the properties of the EE are then analyzed. An novel algorithm is proposed to find the maximal EE under...
We demonstrate for the first time a polarization-multiplexed multiple-input multiple-output radio-over-fiber system with direct-modulation and envelope-detection architectures. Based on blind equalization techniques, cross-channel interferences in both optical fiber and wireless channels are cancelled simultaneously without incurring additional overhead.
A novel all-band 60-GHz RoF system with 4 sub-bands has been proposed to offer converged legacy wireless services and multi-gigabit data access. Successful transmission of 0.4-Gb/s QPSK-OFDM and three independent 0.5-Gb/s OOK data is achieved.
A novel full-duplex LO-free 60-GHz radio-over-fiber (RoF) transmission system is proposed. Full-duplex error-free transmission without optical/electrical LO required in either remote antenna units or mobile terminals is successfully demonstrated for next generation wireless communications.
This paper presents a novel merged circuit which can be used in wireless transmitter. This circuit joins up-conversion mixer and voltage controlled oscillator (VCO) together. The block plays an important role in a transmitter. The design is single-end input and output which can be applied to a communication system with 50ohm antenna directly. The proposed design adopts current reuse and matching work...
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