Title:
RECEPTION DEVICE, TRANSMISSION DEVICE, COMMUNICATION SYSTEM, CONTROL CIRCUIT, STORAGE MEDIUM, RECEPTION SYNCHRONIZATION METHOD AND TRANSMISSION METHOD
Document Type and Number:
WIPO Patent Application WO/2021/140627
Kind Code:
A1
Abstract:
A reception device according to the present invention comprises: a correlation value calculating unit (251) that calculates a first cross-correlation function between a received signal that is a signal having a preamble spread by an up-chirp as well as by a down-chirp and the up-chirp and that calculates a second cross-correlation function between the received signal and the down-chirp; a power value calculating unit (252) that calculates a first power value of the first cross-correlation function and calculates a second power value of the second cross-correlation function; a correlation power memory (254) that stores the first power value and the second power value at each sample timing for one cycle of spread code; a threshold determination unit (255) that determines a first estimation timing from the first power values for one cycle of spread code and determines a second estimation timing from the second power values for one cycle of spread code; and an estimation unit (241) that uses the first estimation timing and the second estimation timing to estimate a spread code timing of a transmission device and that roughly estimates a frequency offset relative to the transmission device.
Inventors:
FUKUMA MEGUMI (JP)
HIGASHINAKA MASATSUGU (JP)
HIGASHINAKA MASATSUGU (JP)
Application Number:
PCT/JP2020/000500
Publication Date:
July 15, 2021
Filing Date:
January 09, 2020
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP (JP)
International Classes:
H04W72/04; H04B1/69
Foreign References:
| JP2019021964A | 2019-02-07 |
Other References:
YUBI QIAN ET AL.: "The Acquisition Method of Symmetry Chirp Signal Used in LEO Satellite Internet of Things", IEEE COMMUNICATIONS LETTERS, vol. 23, no. 9, 2 July 2019 (2019-07-02), pages 1572 - 1575, XP011745022, ISSN: 1089-7798, DOI: 10.1109/LCOMM.2019.2926262
Attorney, Agent or Firm:
TAKAMURA, Jun (JP)
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