Mitarbeiter

M. Sc. Arslan Ali

Kontakt

  • E-Mail:
  • Telefon: 09131/85-27188
  • Fax: Neu:091318528730
  • Raum: 01.178 H
  • Neu: Wetterkreuz 15
    91058 Erlangen

Über Arslan Ali

Biography

Arslan Ali was born in Rawalpindi, Pakistan in 1988. He received degree (with Honours) in B.Sc. Electrical Engineering from University of Engineering & Technology (UET) Taxila, Pakistan in 2010. From 2011 to 2012, he worked as an Associate Engineer with Pakistan Mobile Communications Limited (PMCL) - Mobilink, Pakistan. He received M.Sc. degree in Communications & Multimedia Engineering (CME) from Friedrich-Alexander-Universität (FAU) Erlangen-Nürnberg, Germany in 2014. Since January 2015, he has been working as a Research Assistant for making his Ph.D. at the Institute of Electronics Engineering (LTE) of Friedrich-Alexander-Universität (FAU) Erlangen-Nürnberg. His research is primarily associated with design & characterization of Massive MIMO Communication systems.

Areas of Interest

  • Massive MIMO and 5G Mobile Communications Systems
  • Statistical Signal Integrity & Processing
  • Hardware Impairments Aware BS RF Fingerprinting
  • Communications System Design
  • Digital & Analog Baseband Transceiver Design
  • Distributed Antenna System
  • Passive Load Modulation for Single RF MIMO Architecture

Lehrveranstaltungen Wintersemester 2018

Publikationen

2019

  • A. Ali and G. Fischer, "The Phase Noise and Clock Synchronous Carrier Frequency Offset based RF Fingerprinting for the Fake Base Station Detection" in The Phase Noise and Clock Synchronous Carrier Frequency Offset based RF Fingerprinting for the Fake Base Station Detection, Cocoa Beach, Florida, USA, 2019 (to be published). [Bibtex]
    @inproceedings{ali2019,
    abstract = {This paper presents very promising radio frequency (RF) fingerprinting techniques for the terminal-based detection of fake base station (FBS) in a wireless cellular network. The proposed schemes are based on identifying the analog hardware impairments of the transmitter. In this regard, phase noise analysis and its measured signatures reveal that low to medium end software defined radio (SDR) acting as FBS can certainly be detected if the detecting terminal’s own phase noise is at least 10- dB better than the transmitter. However, for medium to high end FBS, a computationally efficient network synchronized carrier frequency offset (CFO) approach has been proposed and the measurement results confirm that the regular base stations (RBS) that are clock synchronized show identical CFO values whereas, the FBS show large and random offset values. Furthermore, the CFO stability (Frequency offset vs. time) signatures illustrate that an FBS running by its own lazy clock show a large instability in the frequency offset values and even in case of a precision clock, fluctuations vanish though the stabilized offset is still large enough for a user terminal to distinguish the FBS from the RBS.
    }, author = {Ali, Arslan and Fischer, Georg}, language = {English}, booktitle = {The Phase Noise and Clock Synchronous Carrier Frequency Offset based RF Fingerprinting for the Fake Base Station Detection}, cris = {https://cris.fau.de/converis/publicweb/publication/214072970}, year = {2019}, month = {04}, day = {08}, eventdate = {2019-04-08/2019-04-09}, eventtitle = {2019 IEEE 20th Wireless and Microwave Technology Conference (WAMICON) - WAMICON}, faupublication = {yes}, keywords = {phase noise; carrier frequency offset; RF Fingerprinting; fake base station; software defined radio; carrier frequency stability; hardware impairments; physical layer security}, note = {unpublished}, peerreviewed = {automatic}, title = {The Phase Noise and Clock Synchronous Carrier Frequency Offset based RF Fingerprinting for the Fake Base Station Detection}, type = {Konferenzschrift}, venue = {Cocoa Beach, Florida, USA}, }
  • A. Ali and G. Fischer, "Symbol Based Statistical RF Fingerprinting for Fake Base Station Identification" in 29th International Conference Radioelektronika 2019, Microwave and Radio Electronics Week (MAREW), Pardubice, Czech Republic, 2019 (to be published). [Bibtex]
    @inproceedings{ali2019a,
    abstract = {The identification of fake base station (FBS) in a cellular network has become challenging with the development of various software defined radio platforms and mobile standards. This paper, therefore, presents robust statistical approach to detect unique non-linearities based hardware impairments of the transmitter. Employing the fact that power amplifier (PA) of a regular base station (RBS) is a costly and high precision device with a provision of sophisticated digital predistortion (DPD) hardware implementation and in contrary, this DPD based linearization effort is not spent in existing SDR platforms so PA of an SDR based FBS tends to violate the spectral mask and introduces large amplitude and phase errors in the transmitted signal compared to the RBS. At first, a second order symbolbased error vector magnitude (EVM) approach is triggered at the user equipment (UE) to measure the non-linearity induced by the PA of various SDR based FBS. Afterward, a higher fourth order moment i.e. kurtosis approach has been proposed along with the actual measurement results to determine the noise structuredness of the received signal at UE. The kurtosis on magnitude of extracted complex noise cloud is found to be a strong indicator to identify the FBS.
    }, author = {Ali, Arslan and Fischer, Georg}, language = {English}, booktitle = {29th International Conference Radioelektronika 2019, Microwave and Radio Electronics Week (MAREW)}, cris = {https://cris.fau.de/converis/publicweb/publication/214073958}, year = {2019}, month = {04}, day = {16}, eventdate = {2019-04-16/2019-04-18}, faupublication = {yes}, keywords = {higher order moments; error vector statistics; kurtosis; RF fingerprinting; fake base station; software defined radio; hardware impairments; physical layer security}, note = {unpublished}, peerreviewed = {automatic}, title = {Symbol Based Statistical RF Fingerprinting for Fake Base Station Identification}, venue = {Pardubice, Czech Republic}, }

2018

  • A. Ali, G. Fischer, F. Burkhardt, and M. Breiling, "Comparison of Various Hardware Architectures for the Shared UE-Side Distributed Antenna Component" in 2018 IEEE International Symposium on Dynamic Spectrum Access Networks (DySPAN) - Workshop: 5G and Spectrum Sharing (5G Spectrum), Seoul, South Korea, Korea (Republic of), 2018. [Bibtex]
    @inproceedings{ali2018,
    abstract = {Shared UE-side Distributed Antenna System (SUDAS) is a very promising technique in order to deliver an improved coverage and high throughput beyond 10 Gbit/s to the users in the indoor and intra-vehicular scenarios for 5G applications. This paper presents an implementation perspective and comparison analysis of different candidate hardware architectures suitable for the Shared UE-side Distributed Antenna Component (SUDAC), which is the main building block of the SUDAS and acts as a relay and performs massive spatialto-frequency domain translation and vice versa. Based on the defined comparison criteria and scoring of different architectures, it has been established that Analog SUDAC with Slight Frequency Shifting (SFS), Analog SUDAC with Digital Control, Digital SUDAC with 802.11ad and Digital SUDAC with Frequency Domain Equalization (FDE) are the top candidates for hardware implementation and future deployment. 
    }, author = {Ali, Arslan and Fischer, Georg and Burkhardt, Frank and Breiling, Marco}, language = {English}, booktitle = {2018 IEEE International Symposium on Dynamic Spectrum Access Networks (DySPAN) - Workshop: 5G and Spectrum Sharing (5G Spectrum)}, cris = {https://cris.fau.de/converis/publicweb/publication/206149331}, year = {2018}, month = {10}, day = {22}, eventdate = {2018-10-22/2018-10-25}, faupublication = {yes}, keywords = {5G mobile communication,frequency domain equalization,mmWave communication,relay communication,transceiver architectures,virtual MIMO}, peerreviewed = {unknown}, title = {Comparison of Various Hardware Architectures for the Shared UE-Side Distributed Antenna Component}, type = {Konferenzschrift}, venue = {Seoul, South Korea, Korea (Republic of)}, }

2017

  • P. Gröschel, S. Zarei, C. Carlowitz, M. Lipka, E. Sippel, A. Ali, R. Weigel, R. Schober, and M. Vossiek, "A System Concept for Online Calibration of Massive MIMO Transceiver Arrays for Communication and Localization", IEEE Transactions on Microwave Theory and Techniques, 2017. [DOI] [Bibtex]
    @article{groeschel2017,
    abstract = {Massive multiple-input multiple-output (MIMO) techniques are being considered for the fifth generation (5G) mobile communication systems in order to deliver high multiplexing gain. However, hardware impairments like quadrature imbalance in mixers violate the requirement for channel reciprocity and may change, e.g., with temperature or while aging. In addition, advanced wireless localization techniques and the generation of predefined beam patterns require knowledge about all antenna phase center positions and the time and phase delay of all transmit and receive channels. Thus, an efficient online compensation method is needed that scales well for very large numbers of transceiver modules. We propose to extend the transmitter with a small measurement feature at the transmitter output based on one uncalibrated power detector per module as well as a single, external four-element backscatter array for the entire matrix. These enhancements facilitate a fast and efficient iterative calibration, which recognizes and mitigates all major error sources. Beside optimal communication throughput and energy efficiency, it thereby brings localization capabilities to mobile networks as an additional major benefit. For verification, a system of multiple cost-efficient 5.8-GHz massive MIMO transceivers with 150-MHz bandwidth and a backscatter array has been implemented. Measurement results demonstrate the capability of the proposed concept to efficiently compensate major error sources as well as its robustness.},
    author = {Gröschel, Patrick and Zarei, Shahram and Carlowitz, Christian and Lipka, Melanie and Sippel, Erik and Ali, Arslan and Weigel, Robert and Schober, Robert and Vossiek, Martin},
    cris = {https://cris.fau.de/converis/publicweb/publication/108243344},
    year = {2017},
    month = {03},
    day = {01},
    doi = {10.1109/TMTT.2017.2663404},
    faupublication = {yes},
    issn = {0018-9480},
    journaltitle = {IEEE Transactions on Microwave Theory and Techniques},
    keywords = {Backscatter transponder (BT),calibration,fifth generation (5G) mobile communication,massive multiple-input multiple-output (MIMO),wireless localization},
    peerreviewed = {Yes},
    shortjournal = {IEEE T MICROW THEORY},
    title = {A System Concept for Online Calibration of Massive MIMO Transceiver Arrays for Communication and Localization},
    type = {online publication},
    url = {http://ieeexplore.ieee.org/document/7867061/},
    }

2016

  • M. A. Sedaghat, R. Müller, G. Fischer, and A. Ali, "Discrete Load-Modulated Single-RF MIMO Transmitters" in 20th Int’l ITG Workshop on Smart Antennas, München, Germany, 2016. [Bibtex]
    @inproceedings{sedaghat2016,
    author = {Sedaghat, Mohammad Ali and Müller, Ralf and Fischer, Georg and Ali, Arslan},
    language = {English},
    booktitle = {20th Int’l ITG Workshop on Smart Antennas},
    cris = {https://cris.fau.de/converis/publicweb/publication/118444524},
    year = {2016},
    month = {03},
    faupublication = {yes},
    peerreviewed = {Yes},
    title = {Discrete Load-Modulated Single-RF MIMO Transmitters},
    type = {Konferenzschrift},
    venue = {München, Germany},
    }

2015

  • A. Ali, "Baseband Architecture Design of Massive MIMO Communication System with FPGAs" in Baseband Architecture Design of Massive MIMO Communication System with FPGAs, Stuttgart, Germany, 2015. [Bibtex]
    @inproceedings{ali2015,
    author = {Ali, Arslan},
    language = {English},
    booktitle = {Baseband Architecture Design of Massive MIMO Communication System with FPGAs},
    cris = {https://cris.fau.de/converis/publicweb/publication/214071476},
    year = {2015},
    month = {10},
    eventtitle = {26th Meeting ITG Professional Group "Applied Information Theory" - Massive MIMO: Theory and Applications},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Baseband Architecture Design of Massive MIMO Communication System with FPGAs},
    type = {Konferenzschrift},
    venue = {Stuttgart, Germany},
    }

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