Pulse or digital communications – Receivers – Automatic frequency control
Reexamination Certificate
2006-09-15
2010-02-16
Bocure, Tesfaldet (Department: 2611)
Pulse or digital communications
Receivers
Automatic frequency control
C375S326000, C455S324000, C455S192200
Reexamination Certificate
active
07664210
ABSTRACT:
A non-coherent synchronous direct-conversion receiving apparatus is provided. The apparatus includes a RF receiving unit, an I/Q ADC unit, and a digital signal processing unit for analyzing the digital signal received from the I/Q ADC unit to adjust a bandwidth of a variable receiving filtering unit according to the analyzing result, compensating a frequency offset to be correspondent with a symbol transmitting rate by extracting frequency offset information from the digital signal, compensating a frequency offset using the analyzing result, and applying a voltage corresponding to a sum of compensating values to the RF receiving unit. Therefore, the apparatus can compensate a frequency offset regardless of the magnitude of a frequency offset and performs a stable AFC operation through varying the bandwidth of a receiving filter by estimating the frequency offset with only data information, and adjusting a reference frequency twice through an interface signal.
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Chong Young-Jun
Chung Tae-Jin
Kang Min-Soo
You Sung-Jin
Blakely & Sokoloff, Taylor & Zafman
Bocure Tesfaldet
Electronics and Telecommunications Research Institute
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