Technique for automatically detecting the constellation size of

Details Technique for automatically detecting the constellation size of Technique for automatically detecting the constellation size of

1993-08-20

1995-01-10

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

329304, H04L 2706

Patent

active

053814509

ABSTRACT:
A technique for determining the constellation size of a QAM signal received by a QAM receiver. In general, the implementation of my technique has, as an input signal, a QAM signal having one of a plurality of constellation sizes and determines of constellation size, e.g., 4, 16, 32-ary, by analyzing the probability density function (pdf) of the QAM signal over a pre-established time period. To properly analyze the QAM signal, the signal is-first squared and then normalized to a preset value, e.g., 2.0. As such, the signal power in any of the various constellations is normalized to a fixed level. By generating a histogram of the squared and normalized QAM signal, the technique determines the number of levels of modulation contained in the QAM signal. Each constellation size has a unique number of modulation levels and thus forms unique histogram. From the histogram, a particular constellation size can be determined. Thus, by generating a histogram, the technique determines the constellation size of a QAM signal without requiring a priori carrier lock before accomplishing such a determination.

REFERENCES:
patent: 4918708 (1990-04-01), Pottinger et al.

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