Pulse or digital communications – Receivers – Automatic frequency control
Patent
1995-07-06
1996-07-09
Chin, Stephen
Pulse or digital communications
Receivers
Automatic frequency control
375226, 329302, 329306, 329318, H04L 2706
Patent
active
055352499
ABSTRACT:
In detection of a frequency error of a local frequency for quadrature demodulation of a received signal by sampling (S2) each burst of the received signal by a sampling signal at a sampling period into a predetermined number 2m of sampled vectors, zeroth to (2m-2)-th phase errors are calculated (S3), each phase error accompanying a phase difference which is between two adjacent ones of the sampled vectors and is constant during each burst. Zeroth to (m-1)-th averages are calculated (S4(1)) as regards m consecutive ones of the phase errors with each average calculated starting at a q-th phase error of the phase errors and with q varied between zero and (m-1), both inclusive. A mean value of these m averages is calculated (S4(2)) and is divided (S5) by a divisor comprising the sampling period. The frequency error is given by a quotient of this division. The received signal is derived by reception of a transmitted signal subjected to digital angle modulation, such as GMSK or MSK modulation.
REFERENCES:
patent: 5396521 (1995-03-01), Minami
patent: 5452320 (1995-09-01), Kim et al.
patent: 5473637 (1995-12-01), Gardner
Chin Stephen
Luu Huong
NEC Corporation
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