PHY4- Reconfigurable radios and Hardware/Software implementation

Thursday, 21 June 2018, 09:00-10:30, E1 hall
Session chairDongwoo Kim  (Hanyang University, Korea)


09:00 – Universal Waveforms Processor

Martin Danneberg (Technische Universität Dresden, Germany); Ahmad Nimr (Dresden University of Technology, Germany); Nicola Michailow (National Instruments, Germany); Shahab Ehsanfar (Technische Universität Dresden, Germany); Maximilian Matthé (Technical University Dresden, Germany); Ana Belen Martinez, Dan Zhang and Gerhard Fettweis (Technische Universität Dresden, Germany)
This paper presents a flexible physical layer (PHY) implementation based on the National Instruments (NI) USRP RIO software-defined radio (SDR) platform. The implementation allows to reconfigure important parameters of the physical layer during run-time to create a multitude of modern waveforms. In addition, a first performance evaluation of the transceiver is given. The source code of the field programmable gate array (FPGA) design is freely available as open source.



09:18 – Performance Analysis of a 5G Transceiver Implementation for Remote Areas Scenarios

Wheberth Damascena Dias, Danilo Gaspar and Luciano Leonel Mendes (Inatel, Brazil); Marwa Chafii (Vodafone Chair Mobile Communication Systems & Technische Universitat Dresden, Germany); Maximilian Matthé (Technical University Dresden, Germany); Peter Neuhaus (Vodafone Chair Mobile Communications Systems, Technische Universität Dresden, Germany); Gerhard Fettweis (Technische Universität Dresden, Germany)
Fifth generation of mobile communication networks will support a large set of new services and applications. One important use case is the remote area coverage for broadband Internet access. This use case has significant social and economical impact, since a considerable percentage of the global population living in low populated area does not have Internet access and the communication infrastructure in rural areas can be used to improve agribusiness productivity. The aim of this paper is to analyze the performance of a 5G for Remote Areas transceiver, implemented on field programmable gate array based hardware for real-time processing. This transceiver employs the latest digital communication techniques, such as generalized frequency division multiplexing waveform combined with 2 by 2 multiple-input multiple-output diversity scheme and polar channel coding. The performance of the prototype is evaluated regarding its out-of-band emissions and bit error rate under AWGN channel.



09:36 – A Robust Decoding Method for OFDM Systems Under Multiple Co-channel Narrowband Interferers

Sumit Kumar and Florian Kaltenberger (Eurecom, France); Bernhard Kloiber (Siemens AG, Corporate Technology, Germany); Alejandro Ramirez (Siemens Corporate Technology, Germany)
Software Defined Radio platforms are theoretically capable of operating more than one wireless standard simultaneously. The significant challenges arise when the operating standards use overlapping frequency bands. Co-channel interference is one of such challenges which has been in focus of the cellular communication community, but not in the Industrial, Scientific and Medical (ISM) radio bands where multiple heterogeneous wireless standards operate without a centralized coordination. Recognizing Successive Interference Cancellation (SIC) as one of the proven mechanisms to mitigate co-channel interference, we propose methods to improve Packet Error Rate (PER) of wideband OFDM-based systems in the presence of multiple co- channel narrowband interferers. Our methods achieve improvements in PER statistics at lower received power level compared to conventional methods. Reduction in PER of the dominant OFDM signal makes more packets available for regeneration and hence cancellation during SIC procedure which aides the decoding of the weaker signal. We also propose a simple yet efficient method to detect the presence and localization of multiple narrowband interferers. Extensive Monte-Carlo simulations show that our methods elevate a receiver sensitivity gain up to 6 dB and are capable of detecting multiple narrowband interferers simultaneously. Our methods concern modifications in the physical layer of the receiver only and hence can be integrated into existing infrastructure.



09:54 – Implementing 5G NR Features in FPGA

James Bishop and Jean Marc Chareau (Joint Research Centre of the European Commission, Italy); Fausto Bonavitacola (Engineering Ingegneria Informatica SpA, Italy)
A set of physical layer features defined in the 3GPP 38 series standards (5G) were implemented in commercial off the shelf SDR products. The system created an over-the-air link operating at 3.5GHz, having 40MHz channel width and using 256QAM. The PHY layer was implemented in the FPGA of the SDR transceiver; other layers executed in the host PC controlling the radio frontend. With a 4K video stream as payload, the link allowed us to experiment with: 5G NR numerologies; frequency shaping techniques for reducing OOB emissions and improving spectral utilization; higher order QAM modulation; and mixed numerology communications.



10:12 – Are the Data Rates Predicted by the Analytic Analysis of Receivers with Low Resolution ADCs Achievable

Kilian Roth (Technische Universität München, Germany); Hessam Pirzadeh (University of California, Irvine, USA); Lee Swindlehurst (University of California at Irvine, USA); Josef A. Nossek (TU Munich, Germany & Federal University of Ceara, Fortaleza, Brazil)
Leveraging the available millimeter wave spectrum will be important for 5G. In this work, we compare an in- formation theory based analytic result for the achievable rate of digital beamforming systems with low resolution Analog- to-Digital-Converters (ADCs), to a link-level simulation of the same system. For both evaluation methods we include imperfect channel knowledge at the receiver and the effects of the ADC into a wideband multi-user uplink scenario. For the system we choose a configuration defined by 3GPP New Radio (5G). Our results show a performance gap between the two systems, which is comparable to other evaluations of this kind for systems like LTE (4G). In the low-to-medium SNR regime from -20 to 0 dB there is a constant difference of about 4 dB between the two evaluation methods. However, due to a number of effects not modeled in the achievable rate analysis the maximum spectral efficiency saturates at a significantly lower value.