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<p>To overcome the limitations of Orthogonal Frequency Division Multiplexing&#xa0;(OFDM) under mobility conditions, several alternative waveforms have been proposed, each offering distinct benefits and limitations. A promising approach for future wireless communications, including 6G and beyond, is to unify these waveforms to accommodate diverse operating conditions and user requirements. However, processing multiple computationally intensive waveforms on a traditional Application-Specific Integrated Circuit&#xa0;(ASIC) is impractical due to its fixed design. In contrast, Coarse-Grained Reconfigurable Array&#xa0;(CGRA), a typical class of reconfigurable architectures, provides greater flexibility and efficiency, making it a more feasible alternative for such demanding workloads. In this paper, we propose a unified modulator framework that integrates five different waveforms onto a single CGRA platform. This approach demonstrates the run-time reconfiguration capabilities of CGRAs, enabling seamless switching between waveforms to support a unified modulation model. To optimize execution, this work explores overlapping computational and memory-access patterns for the target waveforms, enhancing performance and efficiency. For evaluation, the proposed design is synthesized on a Stratix-IV FPGA device and compared against existing implementations that focus on fixed, single-waveform architectures. The unified modulator implementation achieves an operating frequency of 170.0&#xa0;MHz, a throughput of 10.88&#xa0;GOPS and a dynamic power dissipation of 528&#xa0;mW. Additionally, the scalability of the proposed approach is evaluated across various input sizes&#xa0;(8<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\times\)</EquationSource> </InlineEquation>4, 8<InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(\times\)</EquationSource> </InlineEquation>8, 16<InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(\times\)</EquationSource> </InlineEquation>16), demonstrating its flexibility with promising results.</p>

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Towards Unified Modulator for Mobility Scenarios: A CGRA-Based Approach

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年2月6日

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  • Zohaib Hassan,
  • Waqar Hussain,
  • Aleksandr Ometov,
  • Elena Simona Lohan,
  • Jari Nurmi

摘要

To overcome the limitations of Orthogonal Frequency Division Multiplexing (OFDM) under mobility conditions, several alternative waveforms have been proposed, each offering distinct benefits and limitations. A promising approach for future wireless communications, including 6G and beyond, is to unify these waveforms to accommodate diverse operating conditions and user requirements. However, processing multiple computationally intensive waveforms on a traditional Application-Specific Integrated Circuit (ASIC) is impractical due to its fixed design. In contrast, Coarse-Grained Reconfigurable Array (CGRA), a typical class of reconfigurable architectures, provides greater flexibility and efficiency, making it a more feasible alternative for such demanding workloads. In this paper, we propose a unified modulator framework that integrates five different waveforms onto a single CGRA platform. This approach demonstrates the run-time reconfiguration capabilities of CGRAs, enabling seamless switching between waveforms to support a unified modulation model. To optimize execution, this work explores overlapping computational and memory-access patterns for the target waveforms, enhancing performance and efficiency. For evaluation, the proposed design is synthesized on a Stratix-IV FPGA device and compared against existing implementations that focus on fixed, single-waveform architectures. The unified modulator implementation achieves an operating frequency of 170.0 MHz, a throughput of 10.88 GOPS and a dynamic power dissipation of 528 mW. Additionally, the scalability of the proposed approach is evaluated across various input sizes (8 \(\times\) 4, 8 \(\times\) 8, 16 \(\times\) 16), demonstrating its flexibility with promising results.