Hyperbolic Frequency Multicarrier Modulation for Wideband Linear Time-Varying Channels

TL;DR

This paper introduces the hyperbolic frequency multicarrier (HFMC) waveform, a novel modulation scheme designed to improve performance in wideband linear time-varying channels affected by high mobility, Doppler effects, and multipath diversity.

Contribution

The paper proposes the HFMC waveform based on affine frequency division multiplexing principles, providing a compact characterization of doubly dispersive channels and enabling improved reliability in high-mobility scenarios.

Findings

HFMC subcarriers exhibit approximate orthogonality.

Spectrum analysis shows overlapping subcarrier spectra.

Input-output analysis confirms the absorption of Doppler scaling into delay.

Abstract

Numerous multicarrier modulation schemes have been proposed recently to enhance the performance in narrowband doubly dispersive channels for emerging high-mobility applications. However, the ultra-reliable modulation framework in wideband linear time-varying (LTV) channels remains an open problem, where the time dilations and contractions brought by the high mobility cannot be ignored for the baseband signal to obtain the constant Doppler shift across the whole transmission band. To solve this problem, we propose the hyperbolic frequency multicarrier (HFMC) waveform in this paper based on the inspiration from affine frequency division multiplexing (AFDM) modulation, where the delay and Doppler shift are absorbed into a 1D shift in the affine domain to provide a compact characterization of doubly dispersive discrete-time channels. By adopting the passband representation of wideband LTV channels and hyperbolic frequency modulated (HFM) signals, we reveal that the Doppler scaling factor brought by the relative mobility can be absorbed into an equivalent delay. The basic principle of HFMC modulation is established by investigating the approximate orthogonality among HFMC subcarriers, which are generated from a basic HFM signal by utilizing uniformly spaced equivalent delay. The spectrum of HFMC subcarriers is also analyzed to evaluate the system capacity, where the overlapping nature in the frequency domain can be observed. The input-output characterization in wideband LTV channels is then executed to confirm the 1D integration of time delay and Doppler scaling factor for each path, which demonstrates the ability to exploit potential multipath diversity. The parameter optimization based on the input-output relation and spectrum analysis is finally developed to balance the efficiency and reliability.