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In wireless sensor networks (WSNs), power-conserving MAC design is vitally important for sensors which use a power source from a fixed utility or manual battery recharging. In this paper, we propose an energy-efficient sensor selection algorithm with two-hop cooperating transmission, which minimizes the total energy consumption of WSNs by exploiting spatial correlation between sensors without compromising...
Depending on the application development needs of wireless sensor network technology, a wireless motion sensor node is developed which integrates Bluetooth Low Energy (BLE) technology. This paper describes the overall architecture of the node as well as the hardware and software modules design. A motion sensing system is designed for testing the performance of the motion sensor node. The system can...
Physical layer multicasting attracts tremendous research interests recently. In this paper, we propose a novel unitary precoder design for multicasting where two common data streams are sent to all users. With the successive interference cancelation (SIC) receivers, the two-input multi-output (TIMO) multicasting channel can be converted into two parallel sub-channels, then we focus on maximizing the...
For broadband wireless systems, the channel between the transmitter and the receiver exhibits frequency selectivity in nature. In this paper, an Finite impulse response (FIR) precoder which supports multiple streams at the transmitter and an FIR minimum mean-squared-error decision feedback equalizer (MMSE-DFE) at the receiver are jointly designed for broadband multi-input multi-output (MIMO) multicast...
Base Station Cooperation (BSC), has been a promising technique for combating the Inter-Cell Interference (ICI) by exchanging information through a high-speed optical fiber back-haul to increase the diversity gain. In this paper, we propose a novel pilot symbol assisted data fusion scheme for Uplink BSC (UBSC). Furthermore, the proposed scheme exploits the pre-defined pilot symbols as the sample of...
A simple low phase noise and wide tuning range voltage-controlled oscillator (VCO) is designed for 10 GHz band application. The proposed oscillator adopts a complementary cross-coupled pair LC-VCO circuit with only one symmetrical inductor and implemented in TSMC 0.18-um CMOS process. A 10 GHz broadband CMOS double-balance mixer for communication receiver is presented. The broadband mixer is fabricated...
In classical three-node communication scenario, two legitimate users (Alice and Bob) communicate over a fading channel and a third one (Eve) observes their transmission as an eavesdropper. Alice can transmit the signal with artificial noise to ensure security communication. The artificial noise degrades the performance of Eve, and it can be cancelled by Bob because of pre-knowing. In this paper, a...
In this paper, we propose a damage localization method exploiting the spatial sparsity of the damages for an isotropic aluminium plate. The proposed method not only makes use of Lamb-wave responses measured by a wireless sensor network (WSN), but also takes advantage of the wave propagation model, which governs the physical characteristics of the Lamb-waves. The finite element method (FEM) is applied...
In this paper, we propose a novel distortion calibration algorithm for uniform circular array (UCA) based on its special structure. A near-field calibration antenna, located in the center of circular array, is used to estimate the gain and phase uncertainties of elements. Besides, a single far-field source is used to estimate the direction-of-arrival (DoA) and mutual coupling matrix (MCM). Finally,...
In future cellular systems, some energy harvesting (EH) powered relaying nodes may be deployed to achieve energy saving and quality of service (QoS) improvement, while base stations still get energy from power grid to ensure basic coverage requirements. In this paper, we focus on maximizing the energy efficiency (EE) of the non-EH source with the help of the EH decode-and-forward (DF) relaying nodes...
How to make dynamic recommendations under volatile user interest drifts has been a problem of great interest in modern recommender systems, where challenges lie in accurate and efficient measurement, modeling, and prediction of the user interest drifts. This paper studies a category-based approach to the problem with the key idea that items are aggregated into categories and recommendations are made...
We propose and experimentally demonstrate a 100Mbit/s real-time optical wireless communication system employing a commercially available phosphor-based white LED and a 200Mbit/s real-time system employing a commercially available RGB LED. A 1080p MKV video signal transmission is demonstrated based on QAM-OFDM modulation format under a 4 m free space transmission length. A post-equalization scheme...
Cooperative technology could improve communication reliability by exploiting transmit diversity. However, the issue of imperfect frequency and timing synchronization makes it a challenge in practice. In this paper, we propose a novel cooperative communication scheme based on full space-time network code (FSTNC), which can maintain a stable network throughput and overcome the imperfect frequency and...
Common time-scale enables a wide range of applications and functionalities of a sensor networks. This paper proposes a clock synchronization method fulfilling the requirement of high precision and low energy consumption for large-scale sensor networks. It uses DAC embedded in microcontroller and voltage-controlled oscillator (VCXO) to act as local variable clock source which has the same frequency...
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