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Information collecting and sharing technologies in disaster areas is important, especially, collecting and sharing information of the damaged location and injured people in a building is important for prompt rescue operation. For that purpose, a method to build up a map of an unknown environment without a priori knowledge is necessary. However, as a map must be explored by multiple autonomous robots...
The problem of H∞ control design for vibration reduction of a base isolated structure with limited wireless communication capacity is studied in this paper. The network under consideration is subjected to measurement quantization, signal transmission delay, and data packet dropout, which appear typically in a network environment. Based on Lyapunov-Krasovskii functional (LKF) theory, some delay-range-dependent...
We demonstrated near-ballistic uni-traveling-carrier photodiode based broadband photonic transmitter-mixers with quasi-Yagi radiators fed horn antennas. By adopting a novel design in the intermediate-frequency (IF) port of such device, we can further extend the IF (bias) modulation bandwidth of NBUTC-PD to over 14GHz. Wireless data transmission with record-high on-off keying date rate as 20-Gb/s via...
Microwave Photonics is widely considered as a disruptive technology for high data rate wireless communications. This paper discusses technological trends in enabling photonic solutions for high data rate wireless access systems operating in the millimeter-wave regime. Besides technical achievements, a focus is also put on worldwide regulations for wireless communications in the E-band (60-90 GHz).
Turbo codes has excellent error correcting performance in low SNR condition. The design of interleaver in Turbo codes directly affects the Turbo decoding performance. Based on analysing the design rules and types of interleaver, a random interleaver is designed by taking advantage of the ergodic property of m sequence. The simulation results show that applying this random interleaver can remarkably...
In recent years, with the transformer substations basically unattended, a new topic for the security of power equipments and electric power lines is presented. Many alarm systems based on ac high-voltage grid, electronic pulse fence or infrared electronic fence have been installed in substations. In this paper, we propose an intelligent anti-theft alarm system based on laser fence and wireless communication...
The stratospheric nacelle system flying in the stratosphere has a very wide application future especially in the fields of modern scientific observation experiments and wireless communication. An attitude control system is designed to adjust and control nacelle attitude, while the reacting inertial wheel system based on PID controller is designed to adjust attitude and restrain changes produced by...
In Orthogonal Frequency Division Multiplexing (OFDM), Fourier Transform (FT) is used as a modulation technique. To avoid Inter-symbol Interference (ISI) in OFDM by a time dispersive channel, a Cycle Prefix (CP) is used which also reduces its spectral efficiency. Discrete Wavelet Packet Transform (DWPT) as a modulation scheme has been proposed for wireless communication. In this paper, DWPT based OFDM...
Motor speed remote control system based on TDMA point-to-multipoint wireless communication technology uses CC2510, a powerful 2.4GHZ system-on-chip (SoC), as its core of hardware. Meanwhile, the W588D voice module, which works as its voice alerting system, is used to warn the faults in motors. Thus, the system can perform wireless remote soft start, stop, speed regulation, speed measurement, supervision...
Wireless communication is very important for the safety production in coal mine. In this paper, two key technologies which are operating frequency and network structure about the wireless communication system in the coal mine tunnel have been studied. Through the study, we get the conclusion that the recommended operating frequency is above 2GHz and the favorable network structure adopts the structure...
Space division multiple access aided orthogonal frequency division multiplexing (SDMA-OFDM) is a promising technique for high data rate future wireless communications. In this paper, a minimum bit error rate (MBER) differential evolution (DE) algorithm based multiuser detector (MUD) for SDMA-OFDM system is proposed. The proposed algorithm directly minimizes the bit error rate (BER) cost function by...
We consider an amplify-and-forward half-duplex co-operative wireless system. Specifically, we examine the role of the relay and design an optimum amplification factor for the relay. In the simple case of the message lasting for two symbols, and from the consideration of transmitting from a 4-QAM constellation, we develop an explicit expression of the pair-wise error probability. An optimum design...
Real-time data collection about the drilling process is an effective way of improving the drilling efficiency. Drillstring acoustic telemetry is an alternative wireless transmission method to retrieve downhole data. A time-domain algorithm based on finite element method is proposed for acoustic wave propagation along the drillstring immersed in viscous drilling fluid. The effects of the channel boundaries,...
In this paper, a new outer loop power control algorithm based on fuzzy theory is proposed. The value corresponding with the difference of BLER and BLERtar, processed by fuzzy membership function, is dealt with fuzzy theory principle to calculate the adjustment step-size of SIRtar for the inner loop power control. The algorithm with the feature of simple operation and fast control can obtain optimal...
We propose a sparse probabilistic learning approach for nonlinear channel equalization in wireless communication systems, by using the relevant vector machine (RVM) technique. In particular, we propose two versions of the RVM based equalizer: 1) maximum a posterior RVM (MAP-RVM), 2) marginalized RVM (MRVM). Compared to the standard support vector machine (SVM) method, the proposed RVM approach not...
This paper addresses the spectrum-sharing for wireless communication with a licensee-primary and a secondary users interfering with each other. We propose a new practical power control policy for the secondary user, under outage performance requirements for both users, with partial knowledge of channel state information.
This paper investigates multi-cell coordinated shared relay with joint processing (JP) scheme in interference limited network. In general, multi-cell coordinated shared relay network increases the Signal to Interference-plus-Noise Ratio (SINR) in cell edge users, but resource usage efficiency is decreased by two-phase transmission of relay protocol. We propose JP of cooperating BSs and shared relay...
In 1997 GESMA (Groupe d'Etudes Sous-Marines de l'Atlantique), in collaboration with TELECOM Bretagne, launched a new project, called TRIDENT. First objectives were to develop a multiple rate underwater acoustic link for images, text and data transmission. This link was designed to provide a wireless communication to AUVs. Since 2006, the platform was extended to low bit rate speech transmission using...
The Traffic Probe Message Service will enable traffic managers to gather roadway state data via wireless communication with vehicles. Despite privacy protections specified for the service, it remains vulnerable to inference attacks aimed at reconstructing the path of a vehicle through the roadway. This paper presented a model for evaluating the location privacy in the Traffic Probe Message Service...
In this paper we revisit the problem of SIR Balancing which was extensively studied in the wireless communication literature. We generalize existing results by showing conditions for the existence and uniqueness of a max-min optimizer. It is shown that a unique positive optimizer exists if the underlying asymptotic coupling matrix is irreducible and the interference functions are strictly monotonic...
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