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Achieving Enhanced Spectral Efficiency for Constant Envelope Transmission in CP-OFDMA Framework.

Zhuhong Zhu1, Yiming Zhu1, Xiaodong Xu2

  • 1National Mobile Communications Research Laboratory, Southeast University, Nanjing 210096, China.

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|December 11, 2025
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Summary
This summary is machine-generated.

Constant-envelope cyclic-prefix OFDM (CE-CP-OFDM) offers high spectral efficiency for 6G networks while reducing the peak-to-average power ratio (PAPR). This addresses power amplifier limitations and nonlinear distortion in next-generation wireless systems.

Keywords:
CP-OFDMchannel estimationconstant-envelopefrequency-domain equalizationspectral efficiency

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Area of Science:

  • Wireless communication systems
  • Signal processing for telecommunications
  • Next-generation mobile networks

Background:

  • Orthogonal frequency-division multiplexing (OFDM) is standard for 6G due to its efficiency, but suffers from high peak-to-average power ratio (PAPR).
  • High PAPR degrades power amplifier efficiency and causes nonlinear distortion, critical issues for power- and cost-constrained 6G networks.

Purpose of the Study:

  • To propose a novel constant-envelope cyclic-prefix OFDM (CE-CP-OFDM) transceiver architecture.
  • To maintain high spectral efficiency while significantly reducing PAPR in 6G systems.
  • To address challenges posed by nonlinear distortion and power efficiency.

Main Methods:

  • Developed a spectrally efficient subcarrier mapping scheme with partial frequency overlap.
  • Introduced an optimal multiuser CE pilot design using frequency-domain phase shifts and generalized DFT-based sequences.
  • Proposed a joint delay-frequency-domain channel estimation and an iterative frequency-domain LMMSE equalizer.

Main Results:

  • The proposed CE-CP-OFDM transceiver maintains high spectral efficiency.
  • Achieved significantly lower PAPR compared to conventional OFDM waveforms.
  • Demonstrated superior bit-error-rate performance in frequency-selective fading channels.

Conclusions:

  • CE-CP-OFDM is a viable waveform for 6G networks, balancing spectral efficiency and power efficiency.
  • The proposed transceiver design effectively mitigates nonlinear distortion and interference.
  • The approach offers a promising solution for future power- and cost-constrained wireless systems.