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The application of network coding in wireless environment provides a new horizon for throughput enhancement. By means of network coding the throughput of a network can be increased very efficiency. In this paper we use a family of constant dimension subspace codes called lifted rank-metric coding (LRMC) and investigate its performance in a general wireless environment. LRMC process reduces the number...
Nano-communications have tremendous potential for applications in the biomedical, environmental, industrial and military fields. Molecular communication is a new communication paradigm which allows nanomachines to exchange information using molecules as carrier. This is the most promising communication method within nanonetworks, since using electromagnetic waves is not very likely due to the size...
In this paper, a novel one bit resolution ADC for wireless communication devices is presented. If we use a conventional one bit resolution ADC for wireless communication devices, the communication quality becomes worse due to heavy non-linearity. To overcome this problem, we proposed a novel one bit resolution ADC circuit with linearity enhancement technique, which uses a S/H and a hysteresis comparator...
In order to reduce energy wastefully consumed by WiFi device, Radio-On-Demand Networks (ROD) has been proposed, which offers wireless access in an on-demand manner. Each WiFi device in ROD is equipped with a low-power wake-up receiver which is capable of detecting the length of frames observed over WiFi channels through envelope detection and on-off-keying (OOK) processing. Once the wake-up receiver...
In this paper we present an advanced model for power consumption in communications. The new model for power consumed in communications takes into consideration parameters power consumption for the active mode, power consumption for the sleep mode, power consumption for the transient mode, transmission period, transient mode duration, sleep mode duration, and active mode duration. The new model for...
WSN (Wireless Sensor Network) has a wide range of applications. As a result, security problems become increasingly important. We investigate the problem of minimising the failure rate of packet delivery in the presence of the modification attacks and the selective forwarding attacks in a static WSN with one base station without using expensive encryption/decryption algorithms. We propose a novel heuristic...
In this article, an iterative demodulation and decoding receiver for M-ary differential chaos shift keying (DSCK) modulation is proposed over Additive White Gaussian Noise (AWGN) channel. The Log-Likelihood Ratios (LLRs) of coherent DCSK demodulator and decoder are derived assuming that its perfect carrier synchronization happened. The simulation results show that the performance of our proposed iterative...
This paper is aimed to develop a low-complexity receiver by treating Doppler rate (phase offset) as nuisance parameter in the hybrid channel estimation. For slowly changing channels, two simple adaptive equalization schemes, based on least squares (LS) and minimum mean-squared error (MMSE) principles, are proposed. For fast-changing channels, we adopt pilot-based channel estimation for equalization...
Testing of VLSI chips are becoming very much complex day by day due to increasing exponential advancement of nano technology. So both front-end and back-end engineers are trying to evolve a system with full testability keeping in mind the possibility of reduced product failures and missed market opportunities. BIST is a design technique that allows a system to test automatically itself with slightly...
The failure modes and failure mechanisms of Jet pipe electro-hydraulic servo valve (JPEHSV) have been analyzed, knowing that the weak links were the receiver of fluidic amplifier, edges of spool valve amplifier and radial clearance of the valve core and the valve sleeve. By studying the wear mechanisms of the weak links, effects of geometric size on wear and effects of performance of servo valve on...
A transmission scheme based on the Alamouti code, which we call the Li-Jafarkhani-Jafar (LJJ) scheme, was recently proposed for the 2×2 X Network (i.e., two-transmitter (Tx) two-receiver (Rx) X Network) with two antennas at each node. This scheme was claimed to achieve a sum degrees of freedom (DoF) of 8 over 3 and also a diversity gain of two when fixed finite constellations are employed at each...
In this paper, we determine accurate expressions for the probability of success of handshake-type network mechanisms in a wireless ad hoc network modelled by a Poisson point process. Handshake-type mechanisms form the basis for the implementation of Quality of Service into wireless ad hoc networks (e.g, to guarantee packet delivery). However, to our knowledge, their analysis using a stochastic model...
This paper analyzes the transmission capacity of D2D (Device-to-Device) network in cellular and D2D heterogeneous networks(HetNets) with cellular users (CeUEs) assisted. The D2D network capacity can be enhanced by allocating a part of CeUE transmission power to assist D2D communication. By utilizing stochastic geometry, we first model the HetNets by homogeneous Poisson point process (HPPP). Secondly,...
In driving safety systems for avoiding collision using vehicle to vehicle communication, it is important for each vehicle to know other vehicles' positions and speed data delivered by beacons periodically sent from the vehicles. Each vehicle has to frequently recognize the correct positions of nearby vehicles because the vehicles have a high risk of collision with them. Aiming to make vehicles to...
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...
The work reported here is part of a PhD research relates to the development of a new type of radiometric system applied to detection of partial discharges signals. A simulation model for the radiometric transmission of a partial discharge pulse is presented. The model is based on a replay model, which acts as a source, which is based on real data to simulate the pulses. The structure considers losses...
In this paper, we present a combining transmission scheme of unitary space-time codes(USTC) and blind interference alignment(BIA) over two-user heterogeneous X Channel where one of two transmitters undergoes time-selective fading channel and another one undergoes frequency-selective fading channel. Even if neither the transmitters nor the receivers know the channel state information, the receivers...
This paper investigates the frequency domain prediction of conducted EMI within power converters supplied by front-end three-phase diode-bridge. Noise source, noise propagation path and noise receiver are identified. Difficulty due to the presence of diode-bridge is analyzed and a method is proposed and verified by measurement to take the variation of propagation path into account while still enable...
Non-Coherent Autocorrelation (AR) UWB receivers are preferred over coherent UWB receivers because it requires no channel state information (CSI) and hence is less complex in nature. The paper investigates the performance of Transmitted Reference (TR) and Differential Transmitted Reference (DTR) scheme using AR UWB receivers. Theoretical analysis of BER performance of non-coherent IR-UWB receivers...
This paper proposes two novel channel quality indicator (CQI) update methods that provide conservative CQIs to improve the cell edge user throughput in coordinated scheduling/beamforming (CS/CB) schemes. In CS/CB, a user usually needs to feed back channel state information (CSI) to its serving cell as the first step. However, due to the lack of knowledge regarding neighboring coordinated cells, e...
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