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Digital Modulation Techniques for Software Defined Radio Applications
Published in Rajeshree Raut, Ranjit Sawant, Shriraghavan Madbushi, Cognitive Radio, 2020
Rajeshree Raut, Ranjit Sawant, Shriraghavan Madbushi
This chapter presents an analysis of the modem modulation techniques that are used in the latest wireless standards, such as IEEE–802.11 and IEEE–802.16 also known as WiMAX. It also gives an insight into selecting proper modulation techniques for SDR as per existing channel quality. SDR system is a useful and adaptable future proof solution to cover both existing and emerging standards. It provides the designs with reconfigurability, intelligence, and software programmable hardware. SDR has given promising solution in building multimode, multiband, and multifunctional wireless communication devices. The quality of service provided by wireless communication services can be greatly improved with the help of correct selection of modulation technique. It will serve to increase radio coverage and reduce power consumption. The better return on investment will be provided for next-generation wireless communication systems along with good quality. Further, in this chapter, amplitude modulator, SSB modulator, and demodulation of USRP-generated .DAT file are implemented with the help of predefined general signal processing blocks present in GNU Radio software. It has been observed that GNU Radio provides high flexibility and ease in designing signal processing blocks with its main feature that allows processing real-time data with high sampling rate and fast computation over other signal processing software. All of the above modulator and demodulation designs will help in understanding and improving the performance parameters of SDR.
Reconfigurable transmission with wideband spectrum sensing using GNU radio and USRP
Published in Amir Hussain, Mirjana Ivanovic, Electronics, Communications and Networks IV, 2015
GNU Radio is an open source software development toolkit that provides signal processing blocks to implement software-defined radios and signal processing systems. USRP (Universal Software Radio Peripheral) serves as the digital baseband and the intermediate frequency part of a radio communication system, making the ordinary computer work as software radio equipment. USRPs are commonly used with the GNU Radio software suite to create software-defined radio systems. A motherboard of USRP provides the following subsystems: clock generation and synchronization, FPGA, ADCs, DACs, host processor interface, and power regulation. These are the basic components required for baseband processing of signals. A modular front end of USRP, called a daughterboard, is used for analog operations such as up/down-conversion, filtering, and other signal conditioning. The application of GNU Radio and USRP in the establishment of an experimental platform was introduced in (Tucker & Tagliarini 2009). A spectrum sensing with energy detection based on GNU radio and USRP was given in (Sarijari et al. 2009). An experimental study of OFDM implementation utilizing GNU radio and USRP was presented in (Marwanto et al. 2009).
Communication systems and network technologies
Published in Kennis Chan, Future Communication Technology and Engineering, 2015
The GNU Radio was developed by Eric Blossom. The transmission and reception of the wireless electromagnetic waves are defined by computer software. Thus, the wireless communication system [2-3] is constructed. Therefore, the problem of digital modulation in high performance radio equipment has become the problem of software. The GNU Radio programming is based on the python scripting language and C++. C++ is used to write a variety of signal processing module while python is used to write the script graph block, which connects each block to a complete signal processing.
Wireless Ranging for Contactless Cognitive Load Inference in Ubiquitous Computing
Published in International Journal of Human–Computer Interaction, 2021
Veljko Pejović, Tilen Matkovič, Mojca Ciglarič
We implement Wi-Mind wireless ranging system on top of GNU Radio (2018) software-defined radio framework. We base our solution on the FMCW radar implementation provided by a GNU Radio extension gr-radar (Wunsch, 2018), which we extend to lock the sensing distance to a specific range and from which we extract the phase of the received signal and timestamps for each phase sample. The code that was used to implement and evaluate our system is available on our GitHub repository (Matkovič, 2018). For hardware, we use Ettus Research Universal Software Radio Peripheral (USRP) B210 and directional log-periodic antennas. We do not use any custom hardware components, as we wish to assess the capabilities of widely available wireless equipment for cognitive load inference, rather than develop a purpose-built prototype optimized for this task. Further technical details about our approach are given in the Appendix.
Transmission of Images on High-Temperature Nuclear-Grade Metallic Pipe with Ultrasonic Elastic Waves
Published in Nuclear Technology, 2021
A. Heifetz, D. Shribak, X. Huang, B. Wang, J. Saniie, R. Ponciroli, E. R. Koehl, S. Bakhtiari, R. B. Vilim
Recent research on ultrasonic information transmission involves either using guided elastic waves for communication on pipes or longitudinal waves for the transmission of information and power through solid walls. In the latter, information is transmitted with transducers positioned along the line of sight and separated by a relatively short distance (on the order of inches).7,8 Ultrasonic communication on pipes uses hardware developed for NDT applications to transmit information over longer distances (on the order of feet).9 Prior work on ultrasonic information transmission on pipes investigated several modulation/demodulation methods, which included low-power, low-bit-rate on-off-keying (OOK) communications,10 cyclic frequency shifting,11 and time-reversal pulse position modulation.12 Our recent efforts on the development of an ultrasonic nuclear pipe communication system for transmission of a large volume of data included demonstration of transmission of images, text files, and sound using refracted shear waves generated with 2-MHz paintbrush piezoelectric transducers (PZTs) on the room-temperature nuclear-grade pipe.13 The ultrasonic communication system was shown to be resilient to low-frequency process noise.6 The amplitude shift keying (ASK) communication protocol, which is a variant of the OOK protocol, was developed and implemented using the GNU Radio software–defined radio (SDR) environment.13–17 A proof-of-principle demonstration consisted of transmitting a 32-KB image at a 2-Kbps bit rate with a bit error rate (BER) of 10−3 across a straight 6-ft-long 304 L stainless steel pipe at room temperature.