World's Best Scientists 2026 revealed!

D-Index & Metrics

Electronics and Electrical Engineering

D-Index
40
Citations
14471
World Ranking
4382
National Ranking
1553

Research.com Recognitions

  • 1985 - IEEE Fellow For contributions to engineering education and to digital signal processing.

Overview

Nisar Ahmed is affiliated with the University of Southern California in the United States. Their research contributions primarily lie within the fields of Engineering and Computer Science, addressing both foundational and applied aspects in these areas.

Their work covers subfields including Safety, Risk, Reliability and Quality, as well as Artificial Intelligence. These subfields highlight a focus on systems that require rigorous safety and reliability standards, alongside the development and application of intelligent computational methods.

The main topics addressed by Nisar Ahmed's research include:

  • Fire Detection and Safety Systems
  • Anomaly Detection Techniques and Applications

These topics suggest an emphasis on technologies and methodologies designed to enhance detection and response mechanisms for critical safety scenarios, as well as techniques for identifying outliers or unusual patterns in data that might indicate faults or threats.

Frequent collaborations have been with the following coauthors:

  • Muniyandy Elangovan
  • Sunil Arora

Their recognized contribution to the engineering and digital signal processing domains was acknowledged by becoming an IEEE Fellow in 1985. The citation for this award specifies recognition for contributions to engineering education and digital signal processing.

Best Publications

  • Terabit free-space data transmission employing orbital angular momentum multiplexing

    Jian Wang;Jian Wang;Jeng-Yuan Yang;Irfan M. Fazal;Nisar Ahmed

  • Optical communications using orbital angular momentum beams

    A. E. Willner;H. Huang;Y. Yan;Y. Ren

  • High-capacity millimetre-wave communications with orbital angular momentum multiplexing

    Yan Yan;Guodong Xie;Martin P. J. Lavery;Hao Huang

  • 100 Tbit/s free-space data link enabled by three-dimensional multiplexing of orbital angular momentum, polarization, and wavelength

    Hao Huang;Guodong Xie;Yan Yan;Nisar Ahmed

  • Mode division multiplexing using an orbital angular momentum mode sorter and MIMO-DSP over a graded-index few-mode optical fibre

    Hao Huang;Giovanni Milione;Martin P. J. Lavery;Guodong Xie

  • Atmospheric turbulence effects on the performance of a free space optical link employing orbital angular momentum multiplexing

    Yongxiong Ren;Hao Huang;Guodong Xie;Nisar Ahmed

  • Mode Properties and Propagation Effects of Optical Orbital Angular Momentum (OAM) Modes in a Ring Fiber

    Yang Yue;Yan Yan;N. Ahmed;Jeng-Yuan Yang

  • Orbital Angular Momentum-based Space Division Multiplexing for High-capacity Underwater Optical Communications.

    Yongxiong Ren;Long Li;Zhe Wang;Seyedeh Mahsa Kamali

  • Adaptive-optics-based simultaneous pre- and post-turbulence compensation of multiple orbital-angular-momentum beams in a bidirectional free-space optical link

    Yongxiong Ren;Guodong Xie;Hao Huang;Nisar Ahmed

  • Performance metrics and design considerations for a free-space optical orbital-angular-momentum-multiplexed communication link

    Guodong Xie;Long Li;Yongxiong Ren;Hao Huang

  • Adaptive optics compensation of multiple orbital angular momentum beams propagating through emulated atmospheric turbulence.

    Yongxiong Ren;Guodong Xie;Hao Huang;Changjing Bao

  • Line-of-Sight Millimeter-Wave Communications Using Orbital Angular Momentum Multiplexing Combined With Conventional Spatial Multiplexing

    Yongxiong Ren;Long Li;Guodong Xie;Yan Yan

  • Experimental characterization of a 400 Gbit/s orbital angular momentum multiplexed free-space optical link over 120 m.

    Yongxiong Ren;Zhe Wang;Peicheng Liao;Long Li

  • Free-space optical communications using orbital-angular-momentum multiplexing combined with MIMO-based spatial multiplexing.

    Yongxiong Ren;Zhe Wang;Guodong Xie;Long Li

  • Crosstalk mitigation in a free-space orbital angular momentum multiplexed communication link using 4×4 MIMO equalization

    Hao Huang;Yinwen Cao;Guodong Xie;Yongxiong Ren

  • Phase correction for a distorted orbital angular momentum beam using a Zernike polynomials-based stochastic-parallel-gradient-descent algorithm

    Guodong Xie;Yongxiong Ren;Hao Huang;Martin P. J. Lavery

  • Octave-spanning supercontinuum generation of vortices in an As_2S_3 ring photonic crystal fiber

    Yang Yue;Lin Zhang;Yan Yan;Nisar Ahmed

  • Experimental demonstration of a 200-Gbit/s free-space optical link by multiplexing Laguerre-Gaussian beams with different radial indices.

    Guodong Xie;Yongxiong Ren;Yan Yan;Hao Huang

  • Fiber coupler for generating orbital angular momentum modes

    Yan Yan;Jian Wang;Lin Zhang;Jeng-Yuan Yang

  • Atmospheric turbulence mitigation in an OAM-based MIMO free-space optical link using spatial diversity combined with MIMO equalization.

    Yongxiong Ren;Zhe Wang;Guodong Xie;Long Li

Frequent Co-Authors

Alan E. Willner
Alan E. Willner University of Southern California
Yan Yan
Yan Yan University of Southern California
Yongxiong Ren
Yongxiong Ren University of Southern California
Moshe Tur
Moshe Tur Tel Aviv University
Guodong Xie
Guodong Xie University of Southern California
Zhe Zhao
Zhe Zhao University of Southern California
Solyman Ashrafi
Solyman Ashrafi NxGen Partners
Yang Yue
Yang Yue Nankai University
Andreas F. Molisch
Andreas F. Molisch University of Southern California
Mark A. Neifeld
Mark A. Neifeld University of Arizona

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