|
Phase-continuous multi-BS signal aggregation for range estimation in ISAC systems
|
Authors: Yi Geng
Status: Final
Date of publication: 25 June 2025
Published in: ITU Journal on Future and Evolving Technologies, Volume 6 (2025), Issue 2, Pages 224-236
Article DOI : https://doi.org/10.52953/WJXB2454
|
Abstract:
Achieving high-precision ranging in Integrated Sensing and Communications (ISAC) systems operating in low-frequency bands is challenging due to fragmented frequency resources and clock synchronization errors across multiple operators. Cross-operator Carrier Aggregation (CA) offers a potential solution by combining fragmented frequency resources, but clock synchronization errors between Base Stations (BSs) cause phase discontinuities that severely degrade ranging performance. This paper proposes a novel method for cross-operator CA scenarios that leverages successive echo signals to mitigate these phase discontinuities without requiring perfect clock synchronization between BSs. A comprehensive mathematical analysis of phase discontinuities in multi-BS systems is provided and their impact on range profiles is quantified, revealing a characteristic "fishbone effect" that substantially reduces ranging accuracy. Our proposed method effectively eliminates this effect by progressively matching phase transitions between signals from different BSs. Through extensive simulations in both single-target and multi-target scenarios, the proposed method achieves similar range accuracy comparable to systems under perfect synchronization conditions, offering a viable solution for applications requiring accurate positioning in resource-constrained environments. |
Keywords: Carrier aggregation, clock synchronization error, high-precision ranging, IFFT algorithm, ISAC, OFDM, phase synchronization
Rights: © International Telecommunication Union, available under the CC BY-NC-ND 3.0 IGO license.
|
|
| Detalle del artículo | Artículo | Precio | |
|---|
| 0
| Gratuito | Descargar |
|
|
| |
