Pulse or digital communications – Receivers – Angle modulation
Reexamination Certificate
2005-05-10
2005-05-10
Phu, Phuong (Department: 2631)
Pulse or digital communications
Receivers
Angle modulation
C375S272000, C329S300000
Reexamination Certificate
active
06891905
ABSTRACT:
An FSK receiver comprising: 1) demodulation circuitry for receiving an incoming FSK signal and generating a baseband signal comprising an amplitude modulated symbol stream of Logic 0 symbols and Logic 1 symbols having a data rate, R; 2) auto-correlation circuitry for sampling the baseband signal S times during each symbol and generating an auto-correlation function comprising a sample stream of N-bit samples having a data rate, S×R, and having positive-going peaks approximately coinciding with the center of the Logic 1 symbol in a 010 sequence in the baseband signal and negative-going peaks approximately coinciding with the center of the Logic 0 symbols in a 101 sequence in the baseband signal; and 3) decision circuitry for receiving the auto-correlation function and deciding a logic level of a first symbol as a function of: 1) a comparison of a signal level of a center sample of the first symbol and a mean signal level of the auto-correlation function and 2) a comparison of the signal level of the center sample of the first symbol and a signal level of a center sample of a second symbol preceding the first symbol.
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Lamb Aaron D.
Malone Lawrence J.
National Semiconductor Corporation
Phu Phuong
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