Invention Grant
- Patent Title: Frame and symbol timing recovery for unbursted packetized transmissions using constant-amplitude continuous-phase frequency-modulation
- Patent Title (中): 使用恒幅连续相位调制的无突发分组化传输的帧和符号定时恢复
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Application No.: US14138428Application Date: 2013-12-23
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Publication No.: US08948320B2Publication Date: 2015-02-03
- Inventor: Baijayanta Ray , Nikhil A. Deshmukh
- Applicant: National Instruments Corporation
- Applicant Address: US TX Austin
- Assignee: National Instruments Corporation
- Current Assignee: National Instruments Corporation
- Current Assignee Address: US TX Austin
- Agency: Meyertons Hood Kivlin Kowert & Goetzel, P.C.
- Agent Jeffrey C. Hood; Mark K. Brightwell
- Priority: IN1794/DEL/2010 20100730
- Main IPC: H03D1/00
- IPC: H03D1/00 ; H04L27/01 ; H04L27/26 ; H04L7/04 ; H04B1/10 ; H04B1/7073 ; H04W84/12 ; H04W24/00 ; H04W28/04

Abstract:
A system and method for performing frame and symbol timing synchronization on samples of a received signal that includes a series of frames. Each frame includes a known preamble and payload data. A start-of-frame time is estimated by scanning the received signal samples for the self similarity of two successive preambles. A carrier frequency offset (CFO) is estimated by maximizing a correlation between a magnitude spectrum of the received signal and a magnitude spectrum of a known preamble model. A fine estimate for the CFO is determined by computing a phase difference between samples separated by p repetitions of the base pattern for various values of index p, and computing a slope of a least squares affine fit to the phase differences. Additional operations are performed to find an optimal symbol starting point, to perform carrier phase synchronization and to detect the start of payload data.
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