102 research outputs found

    An approach to achieve zero turnaround time in TDD operation on SDR front-end

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    Thanks to the digitization and softwarization of radio communication, the development cycle of new radio technologies can be significantly accelerated by prototyping on software-defined radio (SDR) platforms. However, a slow turnaround time (TT) of the front-end of an SDR for switching from receiving mode to transmitting mode or vice versa, are jeopardizing the prototyping of wireless protocols, standards, or systems with stringent latency requirements. In this paper, a novel solution called BaseBand processing unit operating in Half Duplex mode and analog Radio Frequency front-end operating in Full Duplex mode, BBHD-RFFD, is presented to reduce the TT on SDR. A prototype is realized on the widely adopted AD9361 radio frequency frontend to prove the validity of the proposed solution. Experiments unveil that for any type of application, the TT in time division duplex (TDD) operation mode can be reduced to zero by the BBHD-RFFD approach, with negligible impact on the communication system in terms of receiver sensitivity. The impact is measured for an in-house IEEE 802.15.4 compliant transceiver. When compared against the conventional TDD approach, only a 7.5-dB degradation is observed with the BBHD-RFFD approach. The measured sensitivity of -91 dBm is still well above the minimum level (i.e., -85 dBm at 2.4 GHz) defined by the IEEE 802.15.4 standard

    System Level Design of Software-Defined Radio Platform

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    This major qualifying project proposes a new single-board design for a Dedicated Short Range Communication (DSRC) On Board Unit (OBU) which consists of a Zynq 7030 system on a chip and AD9361 wideband transceiver. This software-defined radio (SDR) platform design is based on ZedBoard and FMcomms2. The advantages of this approach compared to the ZedBoard and FMcomms2 joint solution are smaller form factor, front end tuned to 5.9GHz and a more powerful processor. Since the prototype has not been manufactured due to the time constraints of this project, the working implementation of 6GHz DSRC radio 802.11p in GNU Radio has been confirmed on the lower capability hardware USRP2 and USRP N210 (Universal Software Radio Peripheral)

    Openwifi : a free and open-source IEEE802.11 SDR implementation on SoC

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    Open source Software Defined Radio (SDR) project, such as srsLTE and Open Air Interface (OAI), has been widely used for 4G/5G research. However the SDR implementation of the IEEE802.11 (Wi-Fi) is still difficult. The Wi-Fi Short InterFrame Space (SIFS) requires acknowledgement (ACK) packet being sent out in 10μs/16μs(2.4 GHz/5GHz) after receiving a packet successfully, thus the Personal Computer (PC) based SDR architecture hardly can be used due to the latency (≥100μs) between PC and Radio Frequency (RF) front-end. Researchers have to do simulation, hack a commercial chip or buy an expensive reference design to test their ideas. To change this situation, we have developed an open-source full-stack IEEE802.11a/g/n SDR implementation — openwifi. It is based on Xilinx Zynq Systemon-Chip (SoC) that includes Field Programmable Gate Array (FPGA) and ARM processor. With the low latency connection between FPGA and RF front-end, the most critical SIFS timing is achieved by implementing Physical layer (PHY) and low level Media Access Control (low MAC) in FPGA. The corresponding driver is implemented in the embedded Linux running on the ARM processor. The driver instantiates Application Programming Interfaces (APIs) defined by Linux mac80211 subsystem, which is widely used for most SoftMAC Wi-Fi chips. Researchers could study and modify openwifi easily thanks to the modular design. Compared to PC based SDR, the SoC is also a better choice for portable and embedded scenario

    Design and Implementation of a Fully Flexible Cognitive Radio Modem

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    Software-defined radio (SDR)-based cognitive communication radio systems are very popular at present, and there have been many investigations on this topic. This paper proposes a new type of cognitive radio transceiver (TRX) that can detect, recognize, and analyze input signals in real-time with minimal data loss. New hardware is designed and manufactured that combines a transmitter and a receiver in a dedicated integrated circuit. For data processing, a field-programmable gate array (FPGA) is used. For each integrated hardware block, appropriate software modules are developed to construct a complex adaptive radiocommunication system as a radio modem that can be configured as a transceiver or repeater. The source coder, channel coder, modulator, spectrum monitoring module, spectrum analyzer, channelizer, symbol rate detector, modulator, modulation type recognition module, demodulator, channel decoder and source decoder are all developed as software modules

    Control and evaluation of the ad-fmcomms5-ebz software-defined radio

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    Software-defined radios (SDR) have presented a new way to do telecommunication systems in a configurable, efficient and portable manner. With the rapid evolving capabilities of these systems, the traditional non-software-configurable ones are being left behind. This project explores the concept of software-defined radio in a theoretical and practical way using the ADFMComms5-EBZ, a SDR provided by Analog Devices with 4 transceivers. A complete analysis is done on the AD-FMComms5-EBZ, understanding all its physical components and its digital interface that make it software-configurable. Furthemore, its interaction with MATLAB/Simulink and with the IIO Oscilloscope application is studied, providing a profound explanation of the board's capabilities on these software. Finally, a few algorithms we found interesting are designed with MATLAB to enable all the potential of the board by reaching MIMO capabilities, analysing the phase of each transmitter and the reception order of symbols.Les ràdios definides per software (SDR) s'han presentat com a una nova manera de fer sistemes de telecomunicacions gràcies a la seva configurabilitat, eficiència i portabilitat. La seva evolució ha sigut ràpida i contínua, fent que els sistemes tradicionals que no son configurables en software s'hagin quedat enrere. Aquest projecte explora el concepte de ràdio definida per software de forma teòrica i pràctica utilitzant l'AD-FMComms5-EBZ, una SDR dissenyada per Analog Devices que incorpora 4 transceptors. En el projecte s'hi fa una anàlisi completa de l'AD-FMComms5-EBZ, entenent tots els seus components físics i la seva interfície digital que en permet la configurabilitat per via de software dels seus components. A més, s'estudia la seva interacció amb MATLAB/Simulink i amb l'aplicació IIO Oscilloscope, donant una explicació profusa de les capacitats de la placa amb aquest programari. Finalment, es dissenyen alguns algoritmes que hem trobat interessants amb MATLAB per a habilitar tot el potencial de la placa, aconseguint que funcioni com a un sistema MIMO, analitzant la fase ens els diferents transmissors i l'ordre de la recepció dels símbols.Las radios definidas por software (SDR) se han presentado como una nueva manera de hacer sistemas de telecomunicaciones gracias a su configurabilidad, eficiencia y portabilidad. Su evolución ha sido rápida y continua, haciendo que los sistemas tradicionales que no son configurables en software se hayan quedado atrás. Este proyecto explora el concepto de radio definida por software de forma teórica y práctica utilizando el AD-FMComms5-EBZ, una SDR diseñada por Analog Devices que incorpora 4 transceptores. En el proyecto se hace un análisis completo de la AD-FMComms5-EBZ, entendiendo todos sus componentes físicos y su interfaz digital que permite su configurabilidad por vía de software de sus componentes. Además, se estudia su interacción con MATLAB / Simulink y con la aplicación IIO Oscilloscope, dando una explicación profusa de las capacidades de la placa con este software. Finalmente, se diseñan algunos algoritmos que hemos encontrado interesantes con MATLAB para habilitar todo el potencial de la placa, consiguiendo que funcione como un sistema MIMO, analizando la fase en los diferentes transmisores y el orden de la recepción de los símbolos

    Evaluation of SDR using Open Source Technology

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    In this paper, an attempt is made to develop adaptable stage for programming characterized Software Defined Radio (SDR) system. Considering the wide demand of wireless communication, the paper aims to propose a flexible platform for software-defined radio, which will be able to meet the wide spectrum from 70 MHz to 6 GHz. This article reviews investigation on the current equipment stage for SDR. It highlights the interfacing of AD-FMCommS4 with ZedBoard. The system can be utilized to extend the future low power gadget devices to integrate with SDR

    Getting better all the time - The Continued Evolution of the GNSS Software-Defined Radio

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    Software Defined Radio (SDR) has an infinite number of interpretations depending on the context in which it is designed and used. By way of a starting definition the authors choose to use that of ‘a reconfigurable radio system whose characteristics are partially or fully defined via software or firmware’. In various forms, SDR has permeated a wide range of user groups, from military, business, academia and to the amateur radio enthusiast

    A Prototype of Co-Frequency Co-Time Full Duplex Networking

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    Radio FD has emerged as an attractive technique capable of doubling the spectral efficiency over half duplex. However, for signal reception, an FD node needs to suppress its transmitter's signals quite significantly. In point to point communication systems, these transmitter signals are termed self-interference. When working with an FD mobile network, the self-interference problem becomes much more complicated because the receiver of an FD base station (BS) receives interference not only from its BS transmitter in its cell, but also from those in the surrounding cells. For the UL channel, self-interference extends to the problem of multiple interference. And, a similar interference problem can be found among the MSs over a DL channel. In both cases, the interference owing to the FD implementation spreads beyond the scope of the self-interference. This article describes the development of FD BSs that use antenna arrays to deal with the BSs' interference, and thus enable FD communication over the UL channel, where the theoretical focus is placed on how to use the antenna array to nullify the multiple interference and receive the signals of the desired MSs simultaneously. To complete the system construction, FD MSs have also been developed to enable DL transmission. A prototype system is described for the scenario of two cells and one FD MS for tests of FD communication over UL channels and DL channels in terms of video performance. Good video quality is demonstrated at both the BS and MS
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