Pulse or digital communications – Receivers – Angle modulation
Reexamination Certificate
2006-05-02
2006-05-02
Corrielus, Jean B. (Department: 2637)
Pulse or digital communications
Receivers
Angle modulation
C375S324000, C375S340000
Reexamination Certificate
active
07039132
ABSTRACT:
This invention provides a method for bit detection of the GFSK signals at the receiver end. The bit detection is done digitally after the carrier is removed. It employs differential detection incorporated with decision feedback, which uses previous one (so-called on-bit differential detection), or two (so-called two-bit differential detection) bits as correcting information. In addition, synchronization for bit timing and frequency offset resulted from clocks between the transmitter and receiver are also performed with or without preamble as prior information. If preamble is available, the bit timing and frequency-offset bias are estimated from the preamble, which is the case of this present invention. If preamble is not available, this information is estimated directly from the unknown received signals. Once the information about the bit timing and frequency offset is obtained, it is used for the following bit detection.
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Abbas Yongacoglu et al.;Differential Detection of GMSK Using Decision Feedback; IEEE Transactions on Communications, vol. 36, No. 6, Jun. 1988, pp. 641-649.
Ralf Mehlan et al.;A Fully Digital Feedforward MSK Demodulator with Joint Frequency Offset and Symbol Timing Estimation for Burst Mode Mobile Radio; IEEE Transactions on Vehicular Technology, vol. 42, No. 4, Nov. 1993; pp. 434-443.
Chen Hung-Kun
Chen Kwang-Cheng
Cheng Jui-Hsi
Huang Chung-Yen
Corrielus Jean B.
Integrated Programmable Communications, Inc.
J.C. Patents
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