Invention Grant
- Patent Title: Digital signal processing circuit and optical space communication system
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Application No.: US16066854Application Date: 2017-01-10
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Publication No.: US10432318B2Publication Date: 2019-10-01
- Inventor: Manabu Arikawa , Toshiharu Ito
- Applicant: NEC CORPORATION
- Applicant Address: JP Minato-ku, Tokyo
- Assignee: NEC CORPORATION
- Current Assignee: NEC CORPORATION
- Current Assignee Address: JP Minato-ku, Tokyo
- Agency: Sughrue Mion, PLLC
- Priority: JP2016-004487 20160113
- International Application: PCT/JP2017/000388 WO 20170110
- International Announcement: WO2017/122605 WO 20170720
- Main IPC: H04B10/06
- IPC: H04B10/06 ; H04B10/61 ; H04B10/112 ; H04B10/118 ; H04L27/22 ; H04L27/06

Abstract:
In order to increase a compensation range for Doppler shift compensation, this digital signal processing circuit is provided with a Doppler shift compensation unit which, on the basis of a sample sequence signal which is oversampled at N (where N is an integer at least equal to 2) times a symbol rate and includes a central sample corresponding to the timing at a symbol center, and a transition sample corresponding to the timing of a symbol transition, finds a Doppler shift amount included in the sample sequence signal and performs Doppler shift compensation. The Doppler shift compensation unit includes a symbol determining unit which performs a symbol determination with respect to the central sample and a determination with respect to the transition sample. The Doppler shift compensation unit switches between these determinations for each corresponding sample and performs said determinations in order to obtain a phase difference and thereby detect the Doppler shift amount.
Public/Granted literature
- US20190013875A1 DIGITAL SIGNAL PROCESSING CIRCUIT AND OPTICAL SPACE COMMUNICATION SYSTEM Public/Granted day:2019-01-10
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