Method and apparatus for symbol clock phase recovery

Details Method and apparatus for symbol clock phase recovery Method and apparatus for symbol clock phase recovery

1994-05-13

1997-01-28

Chin, Stephen

Pulse or digital communications

Receivers

Angle modulation

375355, H04L 2714

Patent

active

055984398

ABSTRACT:
A method and apparatus for recovering the phase of a symbol clock operating at a predetermined symbol rate is described. A modulated RF signal which has been downconverted or a modulated baseband signal is filtered and sampled by a high speed converter. A high speed digital signal processor processes the digitized signal to determine the phase of the symbol clock. The symbol phase is determined independent of carrier phase by repetitively resampling the digitized signal and constructing the histogram for each resample of that signal. By comparing the histograms of each resample the symbol phase may be identified. Using the symbol rate and phase, the signal may be analyzed for carrier phase and frequency errors and modulation accuracy using eye diagrams, modulation trajectories and symbol content.

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Ahmad, J.; Jeans, T.G.; Evan, B. G. "DSP Implementation of Preambleless all Digital OOPSK Demodulator For Maritime and Mobile Data Communications", Conference Title: IEEE Coloquium on DSP Application in Communication Systems (Digest No. 64), Publisher IEEE, London, UK, 22 Mar. 1993.

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