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Cross-Pilot Superposition for Fractional Parameter Estimation in DoA-Aided OTFS Receivers

Mauro Marchese, Pietro Savazzi

Abstract

In this letter, a novel superimposed pilot scheme is proposed for channel estimation in multi-antenna orthogonal time frequency space (OTFS) receivers. Under the assumption of a large uniform linear array (ULA) size at the receiver, the multipath components are separated directly in the angular domain. It is then shown that the proposed superimposed pilot scheme enables the computation of integrated delay and Doppler profiles by averaging the received delay-Doppler matrix across the Doppler and delay axes, respectively. This procedure helps reduce data-to-pilot interference through data averaging. Moreover, it is demonstrated that fractional delays and Dopplers of the multipath components can be estimated by correlating the integrated delay and Doppler profiles with the corresponding delay/Doppler terms. Simulation results show that the proposed approach outperforms existing OTFS superimposed pilot schemes, achieving a lower bit error rate (BER) while exhibiting a trade-off between peak-to-average power ratio (PAPR) and communication performance.

Cross-Pilot Superposition for Fractional Parameter Estimation in DoA-Aided OTFS Receivers

Abstract

In this letter, a novel superimposed pilot scheme is proposed for channel estimation in multi-antenna orthogonal time frequency space (OTFS) receivers. Under the assumption of a large uniform linear array (ULA) size at the receiver, the multipath components are separated directly in the angular domain. It is then shown that the proposed superimposed pilot scheme enables the computation of integrated delay and Doppler profiles by averaging the received delay-Doppler matrix across the Doppler and delay axes, respectively. This procedure helps reduce data-to-pilot interference through data averaging. Moreover, it is demonstrated that fractional delays and Dopplers of the multipath components can be estimated by correlating the integrated delay and Doppler profiles with the corresponding delay/Doppler terms. Simulation results show that the proposed approach outperforms existing OTFS superimposed pilot schemes, achieving a lower bit error rate (BER) while exhibiting a trade-off between peak-to-average power ratio (PAPR) and communication performance.
Paper Structure (10 sections, 2 theorems, 28 equations, 2 figures, 1 algorithm)

This paper contains 10 sections, 2 theorems, 28 equations, 2 figures, 1 algorithm.

Table of Contents

  1. Introduction
  2. System Model
  3. Single-Antenna OTFS Transmitter
  4. Observation Model at the Multi-Antenna Receiver
  5. Angle-Domain Beamforming
  6. Proposed Superimposed Pilot Scheme for DoA-Aided Receivers
  7. Superimposed Cross-Pilots
  8. Disjoint Delay-Doppler Estimation Via Averaging
  9. Simulation Results
  10. Conclusion

Key Result

Lemma 1

The integrated delay profile in eq:delayprofile is given byThe subscript $p$, indicating the path brench, is omitted to lighten the notation in both the statement of the Lemma and the proof. where $\tilde{\mathbf{z}}_u\sim\mathcal{CN}(\mathbf{0}_M,\frac{\sigma^2}{NN_r}\mathbf{I}_M)$ and with $\mathbf{d}_M=\textnormal{diag}(\mathbf{D}_M)$ and $\tilde{\mathbf{d}}_M=\textnormal{diag}(\tilde{\mathbf{

Figures (2)

  • Figure 1: Pilot matrix $\mathbf{X}_p$ configurations: (a) multiple pilot scheme kanazawa2025 and (b) proposed cross-pilot scheme.
  • Figure 2: Simulation results

Theorems & Definitions (4)

  • Lemma 1
  • proof
  • Lemma 2
  • proof