scholarly journals USRP 2901 Based FM Transceiver with Large File Capabilities in Virtual and Remote Laboratory

2018 ◽  
Vol 14 (10) ◽  
pp. 193 ◽  
Author(s):  
Utlapalli Somanaidu ◽  
Nagarjuna Telagam ◽  
Nehru Kandasamy ◽  
Menakadevi Nanjundan
Keyword(s):  
Signal Processing ◽  
Carrier Frequency ◽  
Radio Signal ◽  
Block Diagram ◽  
Software Radio ◽  
Signal Amplitude ◽  
Front Panel ◽  
Dual Band ◽  
Signal Frequency ◽  
Vertical Antenna

The radio signal processing capability can be provided by Universal software radio peripheral (USRP) hardware. The received signal frequency can be controlled and transmitting the signal through wireless is possible by installing NI USRP utility configuration. The programmable USRP was running VI snippet program in block diagram panel with radio companion integrated through USB cable on windows 7 64 bit OS. With the parameters such as IQ rate, transmitter gain, carrier frequency along with device name which is given as ni2901_1 the students can able to tune the radio signal. In addition to this the students can able to record the FM signal and extract the IQ data and plot the spectrum of signal and analyze it using graph palette. The standard FM equation contains the modulation index, carrier frequency, message signal amplitude, frequency deviation and frequency sensitivity can also analyzed using LabVIEW. By using Carson’s rule the bandwidth of wideband FM signal can be calculated. In this project RF0 module is used USRP device is connected with dual band vertical antenna with 2.4 and 5GHz frequency as Tx1 and the receiver is connected to Tri band vertical antenna with 144, 400 and 1200 MHz. while transmitting red color will blink in the device for transmitting and green color indicates the received signal. The purpose of doing this experiment was to gain experience in signal processing and receive hands on experience with the USRP. This VI snippet program will support all file formats. Up sample we used in front panel should be -1 always and if large size files is transmitted the value should be increased. The iPhone received the signal with high quality using ear pods the students can able to listen all the information which is transmitted through USRP. Here the transmitted frequency we used in the front panel is 94.7 MHz. The transmitted signal through USRP is successfully tested in the campus of Institute of Aeronautical Engineering, Hyderabad, India.

A Composite Pulse Modulated Signal Compression and DSP Implementation

2013 ◽  
Vol 734-737 ◽  
pp. 3244-3247
Author(s):  
Ben Cheng Yu ◽  
Zhi Hao Yin ◽  
Yong Yang ◽  
Zhi Feng Wang
Keyword(s):  
Signal Processing ◽  
Pulse Compression ◽  
Block Diagram ◽  
Signal Frequency ◽  
Radar Signal ◽  
Two Phase ◽  
Linear Frequency ◽  
Common Structure ◽  
Digital Pulse ◽  
Modulation Signal

Linear frequency modulated signal and the two-phase encoded signals are widely used in pulse compression radar system derived, based on the analysis of the two signals, a linear frequency modulated with chaotic two-phase coding complex modulated signals. Versatility advantages of simple structure, radar signal processing using DSP signal processing devices. TI's TMS320C6713 DSP as the core basis works to achieve a common structure, the composite modulation signal frequency domain digital pulse compression processing, given the realization of the system block diagram and pulse pressure results. The results showed that the composite modulation signal is easy to produce and handle, and works to achieve feasible.

scholarly journals USRP Based Digital Audio Broadcasting Using OFDM in Virtual and Remote Laboratory

2019 ◽  
Vol 15 (13) ◽  
pp. 77 ◽  
Author(s):  
Nagarjuna Telagam ◽  
Padma Charan Sahu ◽  
Sunita Panda ◽  
Nehru Kandasamy
Keyword(s):  
Radio Signal ◽  
Software Radio ◽  
Audio Signal ◽  
Dual Band ◽  
Digital Audio ◽  
Long Distance ◽  
High Quality ◽  
Remote Laboratory ◽  
Digital Audio Broadcasting ◽  
Virtual Lab

Digital Audio Broadcasting (DAB) is an amazing technology, achieving its promise of certainly delivering high quality digital audio in the most vindicate mobile and fixed receiver environments. The radio signal processing capability can be provided by Universal software radio peripheral (USRP) hardware. The received signal frequency can be controlled and transmitting the signal through wireless is possible by installing NI USRP utility configuration. The programmable USRP was running the VI snippet program in block diagram panel with radio companion integrated through USB cable on windows 7 64. With the parameters such as IQ rate, transmitter gain, carrier frequency along with device name which is given as ni2901_1 the students can able to tune the radio signal. DAB technology is integrated with USRP device using prominent OFDM technique for promise delivery of high quality audio signal. DAB works under four transmission modes in this paper. In this paper RF0 module is used USRP device is connected with dual band vertical antenna with 2.4 and 5GHz frequency as Tx1. This transmitting VI snippet program will support all file formats such as.wav, mp3, etc. the intention of the paper is to transmit the real time data through long distance using DAB technology in remote laboratory. The proposed system is implemented in virtual lab so that it can be accessed by any user from anywhere. This system is successfully tested on institute of aeronautical engineering virtual lab.

scholarly journals Additive manufacturing of highly reconfigurable plasmonic circuits for terahertz communications

2020 ◽  
Author(s):  
Yang Cao ◽  
Kathirvel Nallappan ◽  
Hichem Guerboukha ◽  
Guofu Xu ◽  
Maksim Skorobogatiy
Keyword(s):  
Signal Processing ◽  
Real Time ◽  
Carrier Frequency ◽  
Communication Systems ◽  
Low Loss ◽  
Wet Chemistry ◽  
Waveguide Bends ◽  
Terahertz Communications ◽  
Optical Circuits ◽  
Low Dispersion

Terahertz communications is a booming field in rapid development. While in most of the existing terahertz communication systems, modulated THz carrier wave is transmitted via free-space communication channels, the THz waveguide-based integrated solutions can be of great utility both at the transmitter and receiver ends. Thus, at the transmitter end they can be used for steering, beam forming, and multiplexing of the THz signals. At the receiver end, terahertz waveguide-based solutions can be used as reliable interconnects (especially in the geometrically complex environments, ex. intra-vehicle communications), as well as for real-time analogue signal processing such as filtering and demultiplexing. More generally, waveguide-based THz optical circuits are indispensable for miniaturization and mass production of cost-effective THz communication systems. In this work, we present comprehensive numerical, fabrication and optical characterization studies of a new type of modular THz integrated circuits based on the micro-encapsulated two-wire plasmonic waveguides. Particular attention is payed to the design of optimized components such as waveguides, couplers and waveguide Bragg gratings to realize easy to handle, highly reconfigurable terahertz circuits capable of complex functionalities such as multiplexing and demultiplexing. The basic element of all the developed subcomponents is a low-loss low-dispersion two-wire waveguide suspended inside of a protective micro-sized enclosure (cage) using deeply subwavelength dielectric supports. The high resolution stereolithography 3D printing and wet chemistry metal deposition techniques are employed to fabricate such waveguides where the THz light is mainly confined in the air gap between the two wires. First, the straight waveguides are characterized using continuous-wave THz spectroscopy system with the measured transmission loss and group velocity dispersion (GVD) of 6 m-1 and -1.5 ps/THz·cm respectively at the carrier frequency of 140 GHz. Next, waveguide bends and a Y-coupler based on the two coalescing waveguide bends are studied. We find that due to the presence of a cage, the curved two-wire waveguides show smaller bending loss than the free-standing two-wire waveguides of similar geometry. Additionally, we find that relatively tight bends of ~5cm-radius can be well tolerated by adding less than ~10 m-1 propagation losses to the curved waveguide propagation loss. Next, we design and fabricate the two-wire waveguide Bragg gratings by hot stamping a periodic sequence of metal strips onto a paper sheet and inserting it into the air gap between the two-wire waveguides. The geometry of the grating featuring a Bragg frequency of 140 GHz is studied theoretically and numerically, and the optimal waveguide gratings are then realized experimentally. Such structures can have bandwidths as high as ~20 GHz. Finally, using thus developed modular components, a two channel THz Add-Drop Multiplexer (ADM) is demonstrated for the operation at 140 GHz carrier frequency and featuring a spectral width of 2.8 GHz. We believe that the reported modular platform based on the micro-encapsulated two-wire waveguides can have a strong impact on the field of integrated optical circuits for THz signal processing and potentially sensing due to ease of device fabrication (standard 3D printers and wet chemistry), modular design and high degree of reconfigurability, low-loss and low-dispersion of the underlying waveguides, as well as high potential for the real-time tunability of the optical circuits due to ease of access of the modal fields inside the controlled in-cage environment.

scholarly journals Acoustic Signal Attenuation Determination Technique Traveling Through Obstacles

2019 ◽  
Vol 8 (3) ◽  
pp. 2012-2016
Keyword(s):  
Signal Processing ◽  
Acoustic Signal ◽  
Acoustic Signals ◽  
Signal Frequency ◽  
Signal Attenuation ◽  
Laboratory Procedure ◽  
Novel Technique ◽  
Sonar Signal Processing ◽  
Launch Angle

This paper presents a novel technique for calculation of attenuation of acoustic signals in the materials in underwater channel. A laboratory procedure and algorithms have been developed for finding attenuation. In many applications like sonar signal processing acoustic signal attenuation in the dome or in an enclosure are required to be known. Finding the actual attenuation while signal passes through the materials is very useful in calculating the precise power transmitted through the enclosures. The attenuation in materials mainly dependent on type of material, signal frequency and launch angle of the signal. A proper procedure has been presented in this paper

scholarly journals CMF Signal Processing Method Based on Feedback Corrected ANF and Hilbert Transformation

2014 ◽  
Vol 14 (1) ◽  
pp. 41-47 ◽  
Author(s):  
Yaqing Tu ◽  
Huiyue Yang ◽  
Haitao Zhang ◽  
Xiangyu Liu
Keyword(s):  
Signal Processing ◽  
Phase Difference ◽  
Hilbert Transformation ◽  
Signal Frequency ◽  
Time Interval ◽  
Long Time ◽  
Novel Method ◽  
Adaptive Notch Filters ◽  
Difference Calculation ◽  
Value Decomposition

Abstract In this paper, we focus on CMF signal processing and aim to resolve the problems of precision sharp-decline occurrence when using adaptive notch filters (ANFs) for tracking the signal frequency for a long time and phase difference calculation depending on frequency by the sliding Goertzel algorithm (SGA) or the recursive DTFT algorithm with negative frequency contribution. A novel method is proposed based on feedback corrected ANF and Hilbert transformation. We design an index to evaluate whether the ANF loses the signal frequency or not, according to the correlation between the output and input signals. If the signal frequency is lost, the ANF parameters will be adjusted duly. At the same time, singular value decomposition (SVD) algorithm is introduced to reduce noise. And then, phase difference between the two signals is detected through trigonometry and Hilbert transformation. With the frequency and phase difference obtained, time interval of the two signals is calculated. Accordingly, the mass flow rate is derived. Simulation and experimental results show that the proposed method always preserves a constant high precision of frequency tracking and a better performance of phase difference measurement compared with the SGA or the recursive DTFT algorithm with negative frequency contribution

Modeling of the influence of multiplicative interference on the resolution the ability of signals according to the Woodward criterion in aviation and rocket and space applications radio systems

2020 ◽  
pp. 69-81
Author(s):  
В.М. Артюшенко ◽  
В.И. Воловач
Keyword(s):  
Signal Processing ◽  
Time Resolution ◽  
Phase Structure ◽  
Multiplicative Noise ◽  
Radio Signal ◽  
Wide Band ◽  
Signal Duration ◽  
Space Applications ◽  
Radio Systems ◽  
Multiplicative Interference

Рассмотрены и проанализированы алгоритмы моделирования влияния квазидетерминированных и флуктуационных мультипликативных помех на разрешающую способность систем обработки радиосигналов по задержке и частоте на основе критерия Вудворда. Показано, что при очень широкополосных мультипликативных помехах интервал разрешения по времени определяется только огибающей сигнала и не зависит от его фазовой структуры. Для сигналов с прямоугольной и колоколообразной огибающей он равен эквивалентной длительности сигнала. Приведены примеры вычисления интервалов разрешения при воздействии мультипликативных помех. The influence of quasi-deterministic and fluctuating multiplicative noise on the resolution of radio signal processing systems in terms of delay and frequency based on the Woodward criterion is considered and analyzed. It is shown that for very wide-band multiplicative interference, the time resolution interval is determined only by the envelope of the signal and does not depend on its phase structure. For rectangular and bell-shaped envelope signals, it is equal to the equivalent signal duration. Examples of calculation of resolution intervals under the influence of multiplicative interference are given.

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