TY - JOUR
T1 - A Robust Baseband Transceiver Design for Doubly-Dispersive Channels
AU - Bomfin, Roberto
AU - Chafii, Marwa
AU - Nimr, Ahmad
AU - Fettweis, Gerhard
N1 - Funding Information:
Manuscript received August 21, 2020; revised December 23, 2020; accepted February 15, 2021. Date of publication March 4, 2021; date of current version August 12, 2021. This work was supported in part by the European Union’s Horizon 2020 research and innovation programme through the project iNGENIOUS under Grant 957216, and in part by the CY Initiative of Excellence through the ASIA Chair of Excellence Grant (PIA/ANR-16-IDEX-0008). The associate editor coordinating the review of this article and approving it for publication was P. Casari. (Corresponding author: Roberto Bomfin.) Roberto Bomfin, Ahmad Nimr, and Gerhard Fettweis are with the Voda-fone Chair Mobile Communication Systems, Technische Universität Dresden, 01062 Dresden, Germany (e-mail: roberto.bomfin@ifn.et.tu-dresden.de; ahmad.nimr@ifn.et.tu-dresden.de; gerhard.fettweis@ifn.et.tu-dresden.de).
Publisher Copyright:
© 2002-2012 IEEE.
PY - 2021/8
Y1 - 2021/8
N2 - 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.
AB - 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.
KW - Channel estimation
KW - OCDM
KW - OTFS
KW - doubly-dispersive channel
KW - iterative receiver
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U2 - 10.1109/TWC.2021.3062263
DO - 10.1109/TWC.2021.3062263
M3 - Article
AN - SCOPUS:85102259571
SN - 1536-1276
VL - 20
SP - 4781
EP - 4796
JO - IEEE Transactions on Wireless Communications
JF - IEEE Transactions on Wireless Communications
IS - 8
M1 - 9369970
ER -