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In this paper, we propose a new method of secrecy signal and artificial noise (AN) transmission for a MISO wiretap channel in wireless cellular networks. We first design the secrecy signal beamformer such that its power leakage to the unintended directions is minimized, then we concentrate the AN on the directions with higher risk of information leakage, rather than broadcast it isotropically, such...
With low Peak to Average Power Ratio (PAPR) and robustness of the multiple carrier, SC-FDMA has become the uplink scheme of many wireless systems. Comparing with the Frequency Domain Linear Equalizer (FD-LE), the Decision Feedback Equalizer (DFE) can eliminate more Inter Symbol Interference (ISI) which is the residual of the FD-LE in SC-FDMA system. But the error propagation has degraded the performance...
In this paper, we propose an indoor visible light positioning system which is based on time difference of arrival (TDOA). Compared to current TDOA which uses square wave for pilot signal, our system uses sinusoidal wave for pilot signal. Our proposed system is simulated in the room measuring 5×5×3m3. In the simulations, we consider the effects shot noise, thermal noise and noise from reflected light...
Reliable co-channel bidirectional transmission in wireless networks is moving towards reality by employing the emerging full-duplex (FD) technology. Enhanced by FD-capable nodes, a future wireless network can be made up merely with pairs of bidirectional communicating nodes where each pair occupies a block of orthogonal resource to avoid interference, referred to as pure-FD system. In this paper,...
Wireless sensor networks (WSNs) are widely used due to they are easy and rapid deployed, low cost, low power, self-organized, cooperatively collect the environmental information and realize the integration of the physical world and communication network. It is the fact that due to open nature of the wireless medium an adversary can easily eavesdrop and replay or inject fabricated messages. Different...
Wireless sensor networks (WSNs) are widely used. They are easily and rapid deployed, low cost, low power, self-organized, cooperatively collect the environmental information and realize the integration of the physical world and communication network. However, for most WSNss the open nature of the wireless medium an adversary can easily eavesdrop and replay or inject fabricated messages. Different...
An optical wireless underwater communication simulation model is proposed, which serves as the theoretical model of the underwater optical wireless communication simulator for AUVs. Various parameters that will influence the light distribution and optical communication performance are explored. As a preliminary result, this paper focuses on the light distribution and propagation in water, and the...
The wireless ad-hoc networks do not rely on any infrastructure, which comes at the cost of finite and usually unreplenishable power supplies. It has been an area of intense research how to perform effectively maximum lifetime multicast delivery. This paper presents a new method for this problem, called the Directional Reception Two-step Reconstruction (DRTR). Firstly, based on conventional ad-hoc...
A kind of signal space characteristic estimate method is proposed in this article based on higher order cumulants, which is suitable for parameter estimation of interference signal under multi-path propagation environment. By uniform linear array and its improving, we developed an analysis model of receiver that mixed signal and interference. In order to research time-frequency distribution at different...
One of the main problems facing sensor localization in wireless communication systems is accuracy. In this paper, we propose an optimization algorithm for wireless sensor networks localization based on time-of-arrival (TOA) technique. The optimal points are determined by the iteration process of multiplier method, and the unknown positions are gotten. Simulation results show that the optimization...
SystemC is established as a suitable design and modelling language. It provides a consistent methodology for the design and refinement of complex digital systems. This paper focuses on how wireless features can be incorporated into existing SystemC design methodology in order to use this methodology to model wireless systems. The SystemC modelling language currently lacks a standard framework that...
In addition to blog and schedule sharing, sharing physical data, such as noise or temperature values, and event data, such as information recorded when purchasing at a shop, with other nodes located in a distributed manner enables new applications using geographic distribution. Geographic distribution of physical data of noise allows a user to see geographic trends, such as the location of quiet areas,...
In this paper, a new method to model and simulate a wireless communication system based on system on chip design methodology will be presented. The network performance effected by the amount of detail in the simulation model. Hence there is a need to develop suitable abstractions that maintain the accuracy of the simulation while keeping the computational resource requirements low. The integration...
In this paper, an energy efficient adaptive modulation scheme is proposed for a wireless cognitive radio ad hoc network, where each node is equipped with cognitive radio and the network is an OFDMA system operating on time slots. In each slot, the users with new traffic demand will sense the spectrum and locate the available subcarrier set. Then they choose subcarriers with favorable channel condition...
Spectrum sensing in the context of wireless microphone (WM) signals is considered in this paper. The spectrum sensing algorithm developed in this study makes use of the property that the bandwidth of the WM signal is narrow compared with the bandwidth of a digital television (DTV) channel. As a result, the power of the WM signal is highly concentrated in the frequency domain and there are apparent...
In this work, the bulk-gate controlled circuit to improve the power supply ripple ratio (PSRR) of a Low Dropout Regulator (LDO) which deteriorates due to lowering power consumption is proposed. Designing with 0.25 mum CMOS process, the simulation results by HSPICE shown that the proposed circuit provides a high performance of PSRR even though 1/10 of the power consumption is reduced compare to the...
This paper discusses the design of a 60 GHz low noise amplifier (LNA) using a standard low power SOI CMOS process from ST Microelectronics. First, we outline the technology as well as the mm-wave design challenges. Using recent work on coplanar waveguide (CPW) modeling, we describe how it's possible to use parametric, 3D electromagnetic simulation to complete or replace analytical models of on-chip...
A delay-locked loop of multi-band selector with wide-locking range and low power dissipation is presented. The architecture of the proposed delay-locked loop consists of phase frequency detector, charge pump, band selector, multi-control delay line, and start-up circuit. The multi-band selector is used to extend operation frequency of delay-locked loop by switching the multi-control delay line. The...
This paper describes a comparative analysis between two topologies of operational amplifiers to design a 40 MS/s 12-bit pipeline analog to digital converter (ADC). The analysis includes AC and transient simulation to select the proper topology. This ADC is implemented in a 0.35 mum AMS CMOS technology with 3.3 V single power supply. The capacitors and selected operational amplifiers were scaled for...
Opportunistic routing (OR) schemes, such as ExOR, have been shown to provide significant throughput gains over traditional best-path routing schemes for wireless networks. Though the performance of OR schemes depend on the bit-rate, they currently use a fixed rate for transmitting packets. While several schemes have been proposed for selecting bit-rate for unicast transmission to a single receiver,...
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