China
Africa
Explore chapters and articles related to this topic
Simulators, Testbeds, and Prototypes of 5G Mobile Networking Architectures
Published in Mahmoud Elkhodr, Qusay F. Hassan, Seyed Shahrestani, Networks of the Future, 2017
Shahram Mollahasan, Alperen Eroğlu, Ömer Yamaç, Ertan Onur
NITOS has powerful nodes equipped with various wireless interfaces such as Wi-Fi, Bluetooth, and ZigBee (NITOS, 2016). Some of the nodes are mobile. The software-defined radio (SDR) testbed is composed of Universal Software Radio Peripheral (USRPTM) devices (NITOS, 2016). USRP instruments are integrated into the NITOS wireless nodes. SDR is a radio communication system and a combination of software and hardware technologies in which some physical layer processing functions are employed via a firmware or modifiable software on programmable processing systems, including digital signal processors (DSP), field programmable gate arrays (FPGA), general-purpose processors (GPP), programmable system on chip (SoC), and the other programmable processors (Wireless Innovation, 2016). USRPs are feasible transceivers that convert a personal computer to a capable wireless system (National Instruments, 2016). USRPs let the researchers program a number of physical layer features supporting dedicated cross-layer or PHY-layer research (National Instruments, 2016). NITOS's testbed also contains multiple OpenFlow switches connected to the NITOS nodes that facilitate experimentation on switching and networking protocols (NITOS, 2016). An OpenFlow switch splits the control and data planes, which makes OpenFlow different from the conventional switches (Braun and Menth, 2014). NITOS's testbed provides reproducibility of experiments and evaluation applications and protocols in the real world (NITOS, 2016).
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
Today’s wireless networks consist of a large array of mobile equipments. The communication between variety of mobile equipments is regulated by different IEEE standards [1]. The software defined radio (SDR) provides greatest advantage by its reconfigurable front-end capability. IEEE Standard 802.11a boasts of impressive performance. It is able to transmit at the data rates of up to 54 Mbps. The summary of 802.11a Wi-Fi standard is given in Table 5.1.
Progressive Simulation-Based Design for Networked Real-Time Embedded Systems
Published in Katalin Popovici, Pieter J. Mosterman, Real-Time Simulation Technologies, 2017
This chapter presents the PSBD for networked real-time embedded systems. We give an overview of the PSBD methodology and show a bifurcated design process that implements PSBD for individual embedded devices and the networked embedded system. We then apply the PSBD methodology to the design of a networked SDR system. SDR technology refers to a radio communication system capable of transmitting and receiving different modulated signals across a large frequency spectrum using software programmable hardware [7]. Major components of a SDR board include a digital signal processor (DSP), field-programmable- gate-array (FPGA), and radio frequency (RF) front end that facilitates wireless communication among the nodes. A DSP or a conventional central processor unit computes baseband signal processing and implements the MAC layer for networking. An FPGA is used for fast parallel processing of incoming data and down-sampling the result to a lower sample rate suitable for baseband processing. SDR provides modem designers a great opportunity to build complex modems by programming in software the previously hardware components of the radio. This replacement of hardware by software is in line with the model continuity approach of PSBD, as the individual system components are code modules to be developed and tested along the design process. The advantage of PSBD becomes more explicit when multiple SDR nodes should collaborate to form a network. Hence, the interaction of many complex subsystems should be engineered for best performance of the entire system. We show how PSBD is applied to a single cognitive modem and a cognitive radio (CR) network. This chapter extends the previous work on the PSBD methodology [3] and the case study example on SDR [8]. We aim to show that PSBD is an effective methodology that can be applied to a wide range of networked real-time embedded systems and engineering applications.
Surfing the Radio Spectrum Using RTL-SDR
Published in IETE Journal of Education, 2019
Antonios Valkanas, Divyanshu Pandey, Harry Leib
To allow SDR# to recognize the USB connected dongle the user needs to select the input device and set it to the RTL-SDR model. Once the dongle has been selected, pressing the Start button will trigger the signal reception to begin. A major advantage of using SDR# is the ease of control using its well-designed plugins. The most important plugins are the radio and the configuration menu which allows the user to choose the modulation scheme and the bandwidth of the signal they wish to receive, as well as the filter type and order. SDR# supports narrowband and wideband FM, AM and DSB-SC (Double side band – suppressed carrier) among other schemes. It also allows for different types and filter orders for windowing operation before performing FFT. Students can explore the different windowing options available in SDR#, although changing filter type doesn’t create much difference for the applications mentioned in this paper and was set to Blackman–Harris as recommended in [29] since it provides better side-lobe suppression than other available options. A detailed explanation of all the options and plugins in SDR# software can be found in [27,30].
NomadicBTS: Evolving cellular communication networks with software-defined radio architecture and open-source technologies
Published in Cogent Engineering, 2018
Emmanuel Adetiba, Victor O. Matthews, Samuel N. John, Segun I. Popoola, Abdultaofeek Abayomi
SDR is a modern radio engineering approach in which components that were hitherto implemented in hardware are now implemented using software on an embedded platform such as Field Programmable Gate Array (FPGA) or Personal Computer (PC) (Jondral, 2005). With SDR, it is now possible to have malleable reconfiguration of wireless systems with attributes such as efficient spectrum access, rapid development, inexpensive implementation, easy upgradeability, high flexibility, enhanced Radio Frequency (RF) signal analysis and inter-operability among heterogeneous wireless standards (Thompson, Clem, Renninger, & Loos, 2012). Modern hardware and software platforms have been developed for rapid prototyping based on the SDR architecture. A leading example of such platforms for open-source software development is the GNU Radio (Reyes, Subramaniam, Kaabouch, & Hu, 2016). Different versions of Universal Software Radio Peripheral (USRP) are major hardware platforms for SDR (Akhtyamov et al., 2016). With the combination of these evolving technologies, complete SDR implementations of different wireless standards from 2G to 5G can be achieved. However in the past, it was mandatory to carry out hardware design of separate custom-built radios for different standards, which could be large and expensive. Nowadays, a single versatile SDR hardware can be modified to carry out multiple functions depending on the code it is running at a comparatively low cost.
A reconfigurable wireless superheterodyne receiver for multi-standard communication systems
Published in International Journal of Electronics, 2023
Qing Wang, Yongle Wu, Yue Qi, Weimin Wang
With the rapid development of wireless communication, wireless smart devices and communication standard protocols have changed rapidly. Current communication devices contain multiple technologies, such as GSM, LTE, WIFI technologies, Bluetooth, and 802.11a/b/g/n/ac/ax/ay standards in both 2.4 GHz and 5 GHz. Communication standards are different and contain many different frequency bands (Bronckers et al., 2017; Moghaddasi & Wu, 2020). Thus, RF receivers need to include fast data rate, wide bandwidth (BW), different frequency bands, high sensitivity, reconfigurability, and low power consumption. Over the last decade, the goal of the current intelligent terminal device was to achieve multi-band communications and multi-standard communication protocols (Brandolini et al., 2005; Moghaddasi & Wu, 2016; Sanduleanu et al., 2008). These requirements for communication devices promote innovations of wireless receiver architecture. Compared with the hardware receiver that is not adjustable, the receiver with adjustable key parameters is developing more rapidly. The Software Defined Radio (SDR) receiver (Craninckx, 2012; Mitola, 1995; Rawat et al., 2012) that achieves communication functions by software has received extensive attention. In addition, the SDR receiver has better flexibility and a smaller area. Unfortunately, the SDR needs to process digital baseband signals by high-performance Digital Signal Processor (DSP), and it works with high power consumption (Abidi, 2007; Bagheri et al., 2006; Kenington & Astier, 2000; Yuce & Lu, 2004). Therefore, the reconfigurable receiver achieved by the programmability of the module becomes a feasible structure (Rais-Zadeh et al., 2015). Compared with the SDR receiver, the reconfigurable receiver can process digital and analogue signals at the same time, which is more helpful to realize multi-standard communication.