1. Affine OCDM: Designing Chirp-based Multicarrier System with Maximum Diversity and Coding Gain
- Author
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Guo, Sidong, Ma, Xiaoli, and Wang, Yiyin
- Subjects
Electrical Engineering and Systems Science - Signal Processing - Abstract
This work considers the problem of maximizing multipath diversity and coding gains of orthogonal chirp division multiplexing (OCDM)-based systems. We define and study an Affine OCDM (A-OCDM) system in which a chirp parameter is adapted based on block size to enable maximum diversity and coding gains offered by frequency selective channels. Unlike linear constellation precoded (LCP)-OCDM, our proposed system effectively reduces implementation complexity while harnessing the full diversity potential offered by frequency-selective channels. Additionally, we explore and characterize the upper bounds on coding gains and diversity offered by linear equalizers (LEs). To further reduce the complexity of receive equalization, we propose a subchirp grouping method to multiplex chirp systems into independent sub-blocks. Corroborating simulations are presented to verify the theoretical results and the proposed A-OCDM system is shown to exhibit similar resilience to interference, while enjoying improved error performance, compared to OCDM.
- Published
- 2024