Performance Assessment of IEEE 802.11p with an Open Source SDR-Based Prototype

Abstract

We present a complete simulation and experimentation framework for IEEE 802.11p. The core of the framework is an SDR-based OFDM transceiver that we validated extensively by means of simulations, interoperability tests, and, ultimately, by conducting a field test. Being SDR-based, the transceiver offers important benefits: It provides access to all data down to and including the physical layer, allowing for a better understanding of the system. Based on open and programmable hardware and software, the transceiver is completely transparent and all implementation details can be studied and, if needed, modified. Finally, it enables a seamless switch between simulations and experiments and, thus, helps to bridge the gap between theory and practice. Comparing the transceiver's performance with independent results from simulations and experiments, we underline its potential to be used as a tool for further studies of IEEE 802.11p networks both in field operational tests as well as for simulation-based development of novel physical layer solutions. To make the framework accessible to fellow researchers and to allow reproduction of the results, we released it under an Open Source license.

A Cognitive Radio Enabled Smart Grid Testbed Based on Software Defined Radio and Real Time Digital Simulator

“…In the proposed Smart Grid testbed, we exploit the USRP platform from Ettus, which uses the GNU Radio as development environment. The GNU Radio system running on the computers is a data stream oriented signal processing platform [9]. It processes the baseband communication systems via modularized functions, where the baseband data streams are piped to or from the USRP hardware for transmission or reception.…”

“…This design enables the testbed adaptive to a wide range of scenarios, since ISM bands can be regarded as licensed to the testbed, which can be the case where no exclusive bands are available in home area smart grid application scenarios. In the prototype, the IEEE 802.11a/p/g protocols [9] on the frequency band 2.4GHz and 5GHz have been adapted for validation purpose, where the encoding options include BPSK 1/2, BPSK 3/4, QPSK 1/2, QPSK 3/4, 16QAM 1/2, 64QAM 3/4, 64QAM 2/3 and 64QAM 3/4. A two state Finite State Machine (FSM) is used for channel access management purpose, which is illustrated in Fig.…”

Testing different Channel Estimation Techniques in Real-Time Software Defined Radio Environment

“…The received values from each pilot sub-carrier are initially obtained in a comb-pilot interpolation in the frequency domain and each symbol then demodulated. [29]. The fourelement vector is used to choose these values.…”

DeepRadioID

“…Each streaming video was sent to the receiving server of the rack through USRPs N210 acting as SDR-based WiFi transceivers (WiFi Access Points (APs) and Clients in Fig. 12), using the GNU Radio-based IEEE 802.11a/g/p implementation [6]. In the meanwhile, the edge node performed transcoding of video chunks using ffmpeg [21].…”