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A Sparsely-Connected OTFS-BFDM System Using Message-Passing Decoding

Tingyao WU, Zhisong BIE, Celimuge WU

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Summary :

The newly proposed orthogonal time frequency space (OTFS) system exhibits excellent error performance on high-Doppler fading channels. However, the rectangular prototype window function (PWF) inherent in OTFS leads to high out-of-band emission (OOBE), which reduces the spectral efficiency in multi-user scenarios. To this end, this paper presents an OTFS system based on bi-orthogonal frequency division multiplexing (OTFS-BFDM) modulation. In OTFS-BFDM systems, PWFs with bi-orthogonal properties can be optimized to provide lower OOBE than OTFS, which is a special case with rectangular PWF. We further derive that the OTFS-BFDM system is sparsely-connected so that the low-complexity message passing (MP) decoding algorithm can be adopted. Moreover, the power spectral density, peak to average power ratio (PAPR) and bit error rate (BER) of the OTFS-BFDM system with different PWFs are compared. Simulation results show that: i) the use of BFDM modulation significantly inhibits the OOBE of OTFS system; ii) the better the frequency-domain localization of PWFs, the smaller the BER and PAPR of OTFS-BFDM system.

Publication
IEICE TRANSACTIONS on Fundamentals Vol.E105-A No.3 pp.576-583
Publication Date
2022/03/01
Publicized
2021/08/27
Online ISSN
1745-1337
DOI
10.1587/transfun.2021EAP1030
Type of Manuscript
PAPER
Category
Communication Theory and Signals

Authors

Tingyao WU
  Beijing University of Posts and Telecommunications
Zhisong BIE
  Beijing University of Posts and Telecommunications
Celimuge WU
  The University of Electro-Communications

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