scholarly journals Performance Evaluation of Different Modulation Schemes for Ultra Wide Band Systems

2014 ◽  
Vol 65 (3) ◽  
pp. 184-188 ◽  
Author(s):  
Tasnuva Ali ◽  
Poppy Siddiqua ◽  
Mohammad A. Matin
Keyword(s):  
Short Distance ◽  
Narrow Band ◽  
Wide Band ◽  
Performance Comparison ◽  
Ultra Wideband ◽  
Good Resolution ◽  
Transmission Power ◽  
Large Bandwidth ◽  
Simulation Results ◽  
Modulation Schemes

Abstract Ultra-wideband (UWB) signals with a large bandwidth has some advantages like multipath immunity, low transmission power, good resolution for ranging and detecting geo locations, as well as it can resist to narrow-band interference. These signals are used for transmission in short distance with high throughput. In this paper, we have analyzed different modulation schemes for performance comparison in terms of BER with UWB Gaussian second derivative monopulse and wavelet-based monopulse. The simulation results demonstrate that wavelet-based monopulse provides better performance in comparison to the other two monopulses.

scholarly journals Performance Comparison of Digitized Quaternion Modulation with other Modulation Schemes

2019 ◽  
Vol 27 ◽  
pp. 01004
Author(s):  
Anam Zahra ◽  
Qasim Umar Khan
Keyword(s):  
Global Positioning System ◽  
Gaussian Noise ◽  
Additive White Gaussian Noise ◽  
Performance Comparison ◽  
Superior Performance ◽  
Positioning System ◽  
Space Communication ◽  
Global Positioning ◽  
Simulation Results ◽  
Modulation Schemes

In wireless networks signal’s security from noise has been a very challenging issue, primarily because of the broadcast nature of communication. This paper focuses on digitized Quaternion Modulation (QM) which gives better performance as compared to QPSK, QAM and QFSK. We compare the performance of quaternion modulation with other modulation schemes in terms of BER using idealistic Additive White Gaussian Noise AWGN channel. This scheme can be used in applications such as Global Positioning System (GPS), satellite and space communication system to reduce errors. The simulation results show superior performance of the proposed digitized Quaternion Modulation over its counterparts. Thus one may trade off bandwidth for BER.

Ultra-wideband elliptical patch antenna for microwave imaging of wood

2019 ◽  
Vol 11 (9) ◽  
pp. 948-966 ◽  
Author(s):  
Tale Saeidi ◽  
Idris Ismail ◽  
Wong Peng Wen ◽  
Adam R. H. Alhawari
Keyword(s):  
Low Frequency ◽  
Wide Band ◽  
Microwave Imaging ◽  
Ultra Wideband ◽  
Uniform Illumination ◽  
Elliptical Shape ◽  
Measurement Results ◽  
Simulation Results ◽  
Strip Loading ◽  
Good Agreement

AbstractThis paper presents the design of an elliptical shape ultra-wide band antenna for imaging of wood. The antenna is constructed comprising an elliptical shape of patch loaded by a stub to resonate at lower bands, strip loading at the back, and chamfered ground. Despite having miniaturized dimensions of 20 mm × 20 mm, the proposed antenna shows better results compared to recent studies. The simulation results depict a good ultra-wide bandwidth from 2.68 to 16 GHz, and 18.2–20 GHz. Besides, the proposed antenna has two low-frequency bands at 0.89–0.92 and 1.52–1.62 GHz, maximum gain of 5.48 dB, and maximum directivity of 6.9 dBi. The measurement outcomes are performed in air, plywood, and high-density wood and show a good agreement with the simulated results done using electromagnetic simulator CST. In addition to that, the measurement results of S-parameters, transmitted and received signals show a good agreement with the simulated results. Besides, the measured results illustrate a good isolation and uniform illumination among arrays as well as the received signals' shapes do not change in different environments, but only the amplitude. Hence, the proposed antenna seems to be adequate for microwave imaging of wood.

CHAOTIC MODULATION FOR ROBUST DIGITAL COMMUNICATIONS OVER MULTIPATH CHANNELS

2000 ◽  
Vol 10 (04) ◽  
pp. 695-718 ◽  
Author(s):  
MICHAEL PETER KENNEDY ◽  
GÉZA KOLUMBÁN ◽  
GÁBOR KIS
Keyword(s):  
Narrow Band ◽  
Local Area Networks ◽  
Wide Band ◽  
Local Area ◽  
Wireless Local Area Networks ◽  
Basis Functions ◽  
Modulation Scheme ◽  
Digital Modulation ◽  
Modulation Schemes ◽  
Band Signal

This tutorial work identifies the characteristic properties of chaotic digital modulation schemes and shows how the unique features of chaotic basis functions can be exploited to competitive advantage in selected application domains. Two robust noncoherent chaotic digital modulation schemes (DCSK and FM-DCSK) are described in detail and the performance of FM-DCSK is examined critically for communication channels where systems using conventional coherent and narrow-band modulation schemes fail. Since the FM-DCSK signal is a wide-band signal and its demodulation is performed without synchronization, the FM-DCSK modulation scheme is especially suitable for operation in multipath channel such as Wireless Local Area Networks (WLANs).

scholarly journals Ultra-Wideband Networking

2021 ◽  
pp. 565-569
Author(s):  
Prachi Kandalkar
Keyword(s):  
Narrow Band ◽  
Broad Band ◽  
Wide Band ◽  
Ultra Wideband ◽  
Ultra Wide Band ◽  
Future Change ◽  
Wireless Applications ◽  
Advantages And Disadvantages ◽  
The World ◽  
Recent Developments

Ultra broad band (UWB) has emerged as a leading technology for potential wireless applications due to recent developments in wideband impulse technology, low power and communication. When opposed to traditional narrow band networks, ultra-wide band (UWB) wireless communications takes a completely different approach to wireless communication. The technology is generating a lot of buzz around the world. This paper outlines the characteristics, its applications, and advantages and disadvantages. It main focuses on the future change of UWB.

Narrow Band Interference Elimination based on Compressed Sensing in UWB Energy Detector

2016 ◽  
Vol 66 (2) ◽  
pp. 168
Author(s):  
Priyanka G. Patil ◽  
Gajanan K. Birajdar
Keyword(s):  
Compressed Sensing ◽  
Power Consumption ◽  
Message Passing ◽  
Narrow Band ◽  
Wide Band ◽  
Energy Detection ◽  
Energy Detector ◽  
Large Signal ◽  
Large Bandwidth ◽  
Interference Elimination

<p>Wireless communication applications with large signal bandwidth are developed tremendously in recent times. Due to large bandwidth the wide band communication causes huge power consumption and signal deterioration after addition of narrow band interference (NBI). The ultra wide band (UWB) energy detector, which is highly robust against NBI signal is presented. Compressed sensing is implemented to reduce the power consumption at the analog to digital converter with approximated message passing reconstruction. In addition to this, digital notch is employed to eliminate the NBI affected measurements from compressed version of the received signal before applying it to the energy detector. To analyze the efficiency of the detector, the energy detection and bit error probability of the detector in the absence of NBI and after mitigating NBI is compared. The simulation results are the evidence of effectiveness of the presented energy detector.</p><p> </p>

Performance Comparison of Two Network Coding Modulation Scheme in Multiple Access Relay Cooperation

2012 ◽  
Vol 468-471 ◽  
pp. 2603-2606
Author(s):  
Shi Bin Su ◽  
Yuan Yuan Gao ◽  
Ya Jun Zhang ◽  
Bao Feng Yang ◽  
Ya Long Zhang
Keyword(s):  
Network Coding ◽  
Multiple Access ◽  
Adaptive Modulation ◽  
Performance Comparison ◽  
Modulation Scheme ◽  
Relay Cooperation ◽  
Simulation Results ◽  
Modulation Schemes ◽  
Performance Analysis And Simulation ◽  
System Outage Probability

In this paper, two different modulation schemes are developed in multiple access relay cooperation with network coding. Performance analysis and simulation results show that there is one point where the two modulation schemes have the same system outage probability. This finding can be utilized to propose an adaptive modulation scheme.

scholarly journals Ultra-Wideband Indoor Channel Modelling Using Ray-Tracing Software for through-the-Wall Imaging Radar

2010 ◽  
Vol 2010 ◽  
pp. 1-14 ◽  
Author(s):  
Christophe Lièbe ◽  
Pierre Combeau ◽  
Alain Gaugue ◽  
Yannis Pousset ◽  
Lilian Aveneau ◽  
...  
Keyword(s):  
Experimental Method ◽  
Ray Tracing ◽  
Wide Band ◽  
Ultra Wideband ◽  
Channel Response ◽  
Imaging Radar ◽  
Wideband Signals ◽  
Simulation Results ◽  
Simulated Images ◽  
Wall Imaging

This paper presents a new software for design of through-the-wall imaging radars. The first part describes the evolution of a ray tracing simulator, originally designed for propagation of narrowband signals, and then for ultra-wideband signals. This simulator allows to obtain temporal channel response to a wide-band emitter (3 GHz to 10 GHz). An experimental method is also described to identify the propagation paths. Simulation results are compared to propagation experiments under the same conditions. Different configurations are tested and then discussed. Finally, a configuration of through-the-wall imaging radar is proposed, with different antennas patterns and different targets. Simulated images will be helpful for understanding the experiment obtained images.

scholarly journals Band notched self complementaryultra wideband antenna for wireless applications

2018 ◽  
Vol 7 (2.8) ◽  
pp. 529 ◽  
Author(s):  
Ch Ramakrishna ◽  
G A.E.Satish Kumar ◽  
P Chandra Sekhar Reddy
Keyword(s):  
High Frequency ◽  
Return Loss ◽  
Wide Band ◽  
Ultra Wideband ◽  
Impedance Bandwidth ◽  
Relative Dielectric Permittivity ◽  
Frequency Range ◽  
Ground Structure ◽  
Wireless Applications ◽  
Patch Edge

This paper presents a band notched WLAN self complementaryultra wide band antenna for wireless applications. The proposed antenna encounters a return loss (RL) less than -10dB for entire ultra wideband frequency range except band notched frequency. This paper proposes a hexagon shape patch, edge feeding, self complementary technique and defective ground structure. The antenna has an overall dimensionof 28.3mm × 40mm × 2mm, builton  substrate FR4 with a relative dielectric permittivity 4.4. And framework is simulated finite element method with help of high frequency structured simulator HFSSv17.2.the proposed antenna achieves a impedance bandwidth of 8.6GHz,  band rejected WLAN frequency range 5.6-6.5 GHz with  vswr is less than 2.

Ultra‐wideband DRA integrated with narrow‐band slot antenna

2014 ◽  
Vol 50 (3) ◽  
pp. 139-141 ◽  
Author(s):  
I. Messaoudene ◽  
T.A. Denidni ◽  
A. Benghalia
Keyword(s):  
Narrow Band ◽  
Ultra Wideband ◽  
Slot Antenna
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