Problem
Research questions and friction points this paper is trying to address.
digital twin
software-defined radio
channel emulation
wireless communication systems
real-time testing
ACHEM: A Real-Time Digital Twin Framework with Channel and Radio Emulation
🤖 AI Summary
This work addresses the limitations of existing wireless channel emulation approaches, which either rely on costly hardware or suffer from insufficient fidelity due to model simplifications, thereby hindering high-fidelity testing for software-defined radio (SDR) platforms such as USRP. To overcome these challenges, the paper presents the first purely software-based, end-to-end, real-time digital twin framework that fully emulates USRP communication systems at the I/Q signal level without requiring dedicated hardware. The framework supports multiple transceivers, MIMO configurations, multi-band operation, heterogeneous sampling rates, node mobility, antenna radiation patterns, and diverse channel models. It is also compatible with mainstream open-source SDR ecosystems, including GNU Radio, srsRAN, and OpenAirInterface. Experimental results demonstrate that the proposed framework enables high-fidelity, real-time simulation entirely in software, significantly reducing development and testing costs.
📝 Abstract
Digital twins are becoming an important tool for designing, developing, testing, and optimizing next-generation wireless communication systems. Over the past decade, system softwarization has become a reality, and wireless communication systems are no exception. Software-Defined Radios (SDRs), in general, and Universal Software Radio Peripherals (USRPs), in particular, are often used for prototyping and testing advanced wireless systems. Unfortunately, there is currently no end-to-end, software-based, general-purpose testing environment for SDR-based systems: developers often rely on benchtop setups or even small testbeds, but those are costly and cumbersome to build. At the other end of the spectrum, simulations often rely on simplified channel/radio models and typically do not execute full-stack production code, which can increase development effort and reduce fidelity. In this paper, we propose ACHEM (A Channel Emulator), the first software-based, end-to-end wireless channel emulation environment and toolset for communication systems based on SDRs, specifically USRPs. With the proposed emulator and toolkit, any USRP-based system can be fully emulated at the I/Q level in a pure digital environment without requiring specialized hardware (e.g., vehicles, USRPs, FPGAs, or GPUs). The proposed emulator supports multiple transmitters and receivers, MIMO communications, multiple frequencies, heterogeneous sampling rates, real-time node mobility through vehicle emulation, antenna radiation patterns, and various channel models. ACHEM facilitates wireless digital twin development and deployment. ACHEM is validated with several popular open-source USRP-based wireless communication applications, including GNU Radio, srsRAN 4G/5G, and OpenAirInterface.
Innovation
Methods, ideas, or system contributions that make the work stand out.
Digital Twin
Software-Defined Radio (SDR)
Channel Emulation
Real-Time Simulation
USRP
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