Pulse or digital communications – Receivers – Automatic frequency control
Patent
1996-12-05
1998-09-22
Chin, Stephen
Pulse or digital communications
Receivers
Automatic frequency control
375326, 327 47, H04L 2706
Patent
active
058126112
ABSTRACT:
This invention provides a frequency estimating circuit in which estimating a frequency offset distributed outside the observation range based on the frequency of a received pilot signal degenerated into the observation range. The frequency estimating circuit comprises a time-axis to frequency-axis converter circuit for converting an input data stream constructed of a sampled quantized received pilot signal into a signal on a frequency axis to determine a power spectrum, and an MAX search circuit for searching for the maximum value of the power spectrum to determine the frequency f.sub.1 corresponding to the maximum value of the power spectrum, and a frequency computing circuit for computing candidates of a frequency offset distributed outside the observation range baaed on the frequency f.sub.1 and for outputting them as frequency information f.sub.EST.
REFERENCES:
patent: 5287388 (1994-02-01), Ogura et al.
patent: 5291081 (1994-03-01), Takeuchi et al.
patent: 5428647 (1995-06-01), Rasky et al.
patent: 5500878 (1996-03-01), Iwasaki
patent: 5598441 (1997-01-01), Kroeger et al.
Present and Future Perspective in Research and Development of Digital Modem, Y. Takeuchi et al., IT90-99, pp. 23-30.
Chin Stephen
Deppe Betsy L.
Mitsubishi Denki & Kabushiki Kaisha
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