scholarly journals Impact of Delay Spread on IEEE 802.15.4a Networks with Energy Detection Receivers

2010 ◽  
Vol 8 (03) ◽  
Author(s):  
P. Medina ◽  
J. R. Gallardo ◽  
J. Sánchez ◽  
F. Ramírez-Mireles
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Wide Band ◽  
Energy Detection ◽  
Ultra Wide Band ◽  
Delay Spread ◽  
Multiuser Interference ◽  
Ieee 802.15.4A ◽  
Industrial Environments ◽  
The Impact

This work analyzes the impact of delay spread on IEEE 802.15.4a networks using energy detection (ED) receivers.Specifically, we review the typical values for delay spread in Ultra Wide Band (UWB) systems reported to date for indoor, outdoor and industrial environments, and study how the delay spread impacts the bit-error rate with and without Multiuser Interference (MUI).

scholarly journals Design of a Low-Cost Indoor Navigation System for Food Delivery Robot Based on Multi-Sensor Information Fusion

Sensors ◽  
2019 ◽  
Vol 19 (22) ◽  
pp. 4980 ◽  
Author(s):  
Yunlong Sun ◽  
Lianwu Guan ◽  
Zhanyuan Chang ◽  
Chuanjiang Li ◽  
Yanbin Gao
Keyword(s):  
Information Fusion ◽  
Low Cost ◽  
Wide Band ◽  
Indoor Navigation ◽  
Ultra Wide Band ◽  
Steering Control ◽  
Labor Costs ◽  
Effective Manner ◽  
The Impact ◽  
Meal Delivery

As the restaurant industry is facing labor shortage issues, the use of meal delivery robots instead of waiters/waitresses not only allows the customers to experience the impact of robot technology but also benefits the restaurant business financially by reducing labor costs. Most existing meal delivery robots employ magnetic navigation technologies, which require magnetic strip installation and changes to the restaurant decor. Once the moving path is changed, the magnetic strips need to be re-laid. This study proposes multisource information fusion, i.e., the fusion of ultra-wide band positioning technology with an odometer and a low-cost gyroscope accelerometer, to achieve the positioning of a non-rail meal delivery robot with navigation. By using a low-cost electronic compass and gyroscope accelerometer, the delivery robot can move along a fixed orbit in a flexible and cost-effective manner with steering control. Ultra-wide band (UWB) and track estimation algorithm are combined by extended Kalman filter (EKF), and the positioning error after fusion is about 15 cm, which is accepted by restaurants. In summary, the proposed approach has some potential for commercial applications.

Bit-Error-Rate Evaluation of High-Efficiency Differential-Chaos-Shift-Keying System Over Wireless Channels

2017 ◽  
Vol 27 (01) ◽  
pp. 1850008 ◽  
Author(s):  
Nguyen Xuan Quyen
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Wireless Channels ◽  
High Efficiency ◽  
Wireless Channel ◽  
Delay Spread ◽  
Shift Keying ◽  
Chaos Shift Keying ◽  
Differential Chaos Shift Keying ◽  
Ber Performance

A high-efficiency differential-chaos-shift-keying (HE-DCSK) system has been proposed previously for the improvement of both bit-rate and bit-error-rate (BER) performance in comparison with the conventional DCSK system. This improvement made HE-DCSK be a promising solution for chaos-based communications. However, the performance of this system was just investigated under an additive white Gaussian noise (AWGN) channel. This is main motivation for our work to evaluate the performance of HE-DCSK over a typical wireless channel which is simultaneously affected by white noise, fading, multipath, and delay spread. The operation of the transmitter and receiver over the wireless channel is modeled and described. The BER performance is evaluated by theoretical analysis using Gaussian approximation and discrete integration. The numerical results obtained by Monte Carlo simulations are presented to verify the analyzed performance. Obtained results point out that the HE-DCSK system not only performs better than other DCSK-based ones under wireless channels but also can exploit the multipath characteristic to improve the performance.

scholarly journals METHODS OF MODELING WIRELESS SENSOR NETWORKS TOPOLOGY CONSIDERING INTERNODAL INTERFERENCE

2020 ◽  
Vol 2020 (3) ◽  
pp. 34-44
Author(s):  
Vladimir Vasilevich Fedorenko ◽  
Vladimir Valerevich Samoylenko ◽  
Daria Vladimirovna Alduschenko ◽  
Igor Vladimirovich Emelyanenko
Keyword(s):  
Wireless Sensor Networks ◽  
Sensor Networks ◽  
Network Topology ◽  
Bit Error Rate ◽  
Error Rate ◽  
Frequency Separation ◽  
Wireless Sensor ◽  
Reliability Indicator ◽  
Useful Signal ◽  
The Impact

The article presents the analysis of developing methods of wireless sensor networks (WSNs) topologies based on a graph structure. It indicates the prevalence of tolerance criteria for de-scribing the links between nodes, for example, the limiting distance of radio communication, a sufficient ratio of signal/energy (interference + noise). To consider the impact of inter-node interference on the network topology it is proposed to use the permissible values of bit error probabilities or erasing an information packet in case of distortion of at least one its elements as a criterion for stable communication. The algorithm for calculating an analytical model of internode communication channel is presented to evaluate the effect of intra-network additive and multiplicative noise on the reliability indicator of incoherent message reception in the form of a bit error rate. Expression for the coefficient of structural interaction of the received signal and the interference complex is obtained, which allows considering the dependence of bit error rate on the energy components of individual interference at the receiver input, frequency separation value of a signal and values of each disturbance, their phase shifts and the duration of the information bit. There has been considered practical application of the WSNs topology modeling technique for the internode communication channels with Rice fading of a useful signal and Rayleigh fading of an intra-network interference complex (a case study of using CC2500 modems as part of WSNs nodes). As a result of analysis, there have been determined the relations between nodes, for which the bit error rates do not exceed the allowable value established by requirements for channel capacity and the length of information packets. The presented modeling approach proves the possibility of improving the network topology due to developing the internode links by redistributing the frequency resource between the nodes or adjusting the operation modes of the modems.

A novel analytical approach to the evaluation of the impact of fiber parametric gain on the bit error rate

2001 ◽  
Vol 49 (12) ◽  
pp. 2154-2163 ◽  
Author(s):  
G. Bosco ◽  
A. Carena ◽  
V. Curri ◽  
R. Gaudino ◽  
P. Poggiolini ◽  
...  
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Analytical Approach ◽  
Parametric Gain ◽  
The Impact

An Experimental Evaluation of IEEE 802.15.4a Ultra Wide Band Technology for Precision Indoor Ranging

2012 ◽  
Vol 4 (2) ◽  
pp. 48-63 ◽  
Author(s):  
Tingcong Ye ◽  
Michael Walsh ◽  
Peter Haigh ◽  
John Barton ◽  
Alan Mathewson ◽  
...  
Keyword(s):  
Wide Band ◽  
Ultra Wide Band ◽  
Line Of Sight ◽  
Network Localization ◽  
Outdoor Environments ◽  
Ieee 802.15.4A ◽  
Indoor And Outdoor Environments ◽  
First Time ◽  
Fine Time ◽  
Indoor And Outdoor

Ultra Wide Band (UWB) wireless transmission has recently been the object of considerable attention in the field of next generation location aware wireless sensor networks (WSNs). This is due to its fine time resolution, energy efficiency and robustness to interference in harsh environments. This paper presents a thorough applied examination of prototype IEEE 802.15.4a impulse UWB transceiver technology to quantify the effect of line of sight (LOS) and non line of sight (NLOS) ranging in real indoor and outdoor environments. The results included draw on an extensive array of experiments that fully characterize the 802.15.4a UWB transceiver technology, its reliability and ranging capabilities for the first time. The goal of this work is to validate the technology as a dependable wireless communication mechanism for the subset of sensor network localization applications where reliability and precision positions are key concerns.

Quantitative analysis of the stacked autoencoder method in MIMO-ACO-OFDM VLC systems

2020 ◽  
pp. 147715352092620
Author(s):  
LL Hao ◽  
CD Li ◽  
DY Wang
Keyword(s):  
Visible Light ◽  
Bit Error Rate ◽  
Error Rate ◽  
Communication System ◽  
Orthogonal Frequency Division Multiplexing ◽  
Visible Light Communication ◽  
Delay Spread ◽  
Rate Performance ◽  
Stacked Autoencoder ◽  
Minimum Mean Squared Error

In this paper, a stacked autoencoder network is utilised to realise the signal constellation and transceivers adapted to the dimmable indoor visible light communication system in order to acquire lower symbol error probability. Its decoder parts function as denoising and the equaliser for the proposed multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) visible light communication system which can compensate the non-linear transfer function and the crosstalk between multiple LED data streams. The bit error rate performance as well as the influence of LED spatial intervals on root mean square delay spread, impulse response and bit rate have been analysed considering multipath reflections of the indoor MIMO-VLC system. The numerical results show that the a stacked autoencoder technique performs better in bit error rate reduction compared with state-of-art the zero forcing and minimum mean squared error algorithm. The experiment also shows, when the semi-angle at half power of LEDs and the field of view of Photodetectors become small, better performance can be achieved at the centre of the room, which can be explained by strong beam converge and the decreased multipath interference. Moreover, enlarging the separation between LEDs leads to improved bit error rate performance and reduced channel correlation of channel matrix, which need to be optimally chosen in practice.

IMPACT OF ASE NOISE OF OPTICAL AMPLIFIER ON PIN-RECEIVER AND CALCULATION OF BIT-ERROR RATE

1996 ◽  
Vol 07 (03) ◽  
pp. 441-446
Author(s):  
QIANGSHENG XIANG ◽  
ANSHI XU ◽  
DEMING WU ◽  
LINZHEN XIE
Keyword(s):  
Optical Communication ◽  
Bit Error Rate ◽  
Error Rate ◽  
Optical Amplifiers ◽  
Optical Amplifier ◽  
Optical Channel ◽  
Simple Analytical Expression ◽  
Spectrum Density ◽  
The Impact

A simple analytical expression is derived to calculate the Bit-Error Rate in lightwave systems with optical amplifiers. According to this expression the Bit-Error Rate can be estimated by the signal power and the ASE spectrum density before the receiver. The theoretical calculation agrees with the experiment very well, so it can provide a method to judge the quality of the optical channel in the optical communication system with optical amplifiers. Futhermore, the impact of the ASE noise on the receiver sensitivity is discussed. It is important to select proper receivers in practical systems.

On the Impact of Ultra Wide Band (UWB) on Macrocell Downlink of CDMA-PCS System

2006 ◽  
Vol 43 (2) ◽  
pp. 355-367
Author(s):  
Bazil Taha-Ahmed ◽  
Miguel Calvo-Ramón ◽  
Leandro Haro-Ariet
Keyword(s):  
Wide Band ◽  
Ultra Wide Band ◽  
The Impact
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