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Updated: Aug 7, 2025

Generation and Coherent Control of Pulsed Quantum Frequency Combs
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CORDIC-Based General Multiple Fading Generator for Wireless Channel Digital Twin.

Chen Fang1, Kai Mao1, Sheng Fang1

  • 1The Key Laboratory of Dynamic Cognitive System of Electromagnetic Spectrum Space, College of Electronic and Information Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China.

Sensors (Basel, Switzerland)
|March 11, 2023
PubMed
Summary

A novel wireless channel digital twin architecture was developed using improved hardware circuits for accurate and efficient communication system performance evaluation. This system enables controllable generation of complex fading channels for advanced wireless scenarios.

Keywords:
CORDICchannel digital twinchannel fading generatorstatistical properties

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Area of Science:

  • Wireless Communications Engineering
  • Digital Signal Processing
  • Hardware Acceleration

Background:

  • Accurate wireless channel modeling is crucial for evaluating communication system performance.
  • Existing methods for channel fading generation face challenges in real-time performance and resource utilization.
  • Digital twins offer a controllable platform for physical channel emulation.

Purpose of the Study:

  • To propose a stochastic general fading channel model adaptable to various communication scenarios.
  • To develop a flexible and efficient hardware architecture for channel fading generation on an FPGA platform.
  • To enhance the real-time performance and resource efficiency of channel emulation systems.

Main Methods:

  • Developed a stochastic general fading channel model incorporating the sum-of-frequency-modulation (SoFM) method to address phase discontinuity.
  • Designed and implemented improved CORDIC-based hardware circuits for trigonometric, exponential, and natural logarithm functions.
  • Utilized a compact time-division (TD) structure for hardware resource optimization and developed a correlated Gaussian sequence generation scheme for space-time correlation.

Main Results:

  • Achieved significant reduction in hardware resource consumption from 36.56% to 15.62% for a 16-bit fixed-point single-channel emulation.
  • Reduced latency by 62.5% compared to the classical CORDIC method, decreasing it by 16 system clock cycles.
  • Verified the generator's correctness through consistent output with theoretical results for controllable space-time correlation.

Conclusions:

  • The proposed FPGA-based channel fading generator offers improved real-time performance and hardware resource utilization.
  • The developed system accurately emulates complex fading channels, including controllable space-time correlations.
  • This technology is suitable for emulating large-scale multiple-input multiple-output (MIMO) channels in dynamic wireless environments.