A Robust Baseband Transceiver Design for Doubly-Dispersive Channels

Roberto Bomfin, Marwa Chafii, Ahmad Nimr, Gerhard Fettweis

Research output: Contribution to journalArticlepeer-review

Abstract

In this paper, we investigate three different concepts for robust link-level performance under doubly-dispersive wireless channels, namely, i) channel estimation, ii) cyclic prefix (CP)-free transmission, and iii) waveform design. We employ a unique word-based channel estimation, where we decouple the channel related errors into channel estimation error (CEE) and Doppler error (DE). Then, we show that a trade-off between CEE and DE emerges in the frame design, where the system can be optimized to achieve the minimum composite channel error. Another strategy to improve the link-level performance is to suppress the CP of the sub-blocks. This allows for better channel estimation due to the reduced transmission time, with the penalty of requiring the CP-restoration processing at the receiver. Furthermore, we propose the waveform design based on the equal-reliability criterion (ERC), leading to the block multiplexing-orthogonal chirp division multiplexing (BM-OCDM). This waveform is advantageous in the CP-free transmission mode, where the data symbols have equally distributed interference from adjacent sub-blocks. Our framework is a generalization of the recently proposed orthogonal time frequency space (OTFS), which fails to achieve the ERC. The link-level simulations show that at high modulation and coding scheme, the proposed BM-OCDM provides superior link-level performance than OTFS.

Original languageEnglish (US)
Article number9369970
Pages (from-to)4781-4796
Number of pages16
JournalIEEE Transactions on Wireless Communications
Volume20
Issue number8
DOIs
StatePublished - Aug 2021

Keywords

  • Channel estimation
  • doubly-dispersive channel
  • iterative receiver
  • OCDM
  • OTFS

ASJC Scopus subject areas

  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Applied Mathematics

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