Pulse or digital communications – Receivers – Particular pulse demodulator or detector
Reexamination Certificate
2007-09-25
2007-09-25
Ghebretinsae, Temesghen (Department: 2611)
Pulse or digital communications
Receivers
Particular pulse demodulator or detector
C375S343000, C375S344000
Reexamination Certificate
active
10816876
ABSTRACT:
An OFDM receiver has an autocorrelation circuit configured for generating autocorrelated power values from samples of received short preamble symbols in a received data packet, and a median filter configured for generating a median autocorrelation value from at least a prescribed minimum number of the autocorrelated signal values. A comparator is configured for detecting a symbol boundary, identifying an end of the short preamble symbols, based on the autocorrelated signal values falling below a threshold that is based on the median autocorrelation value. Hence, the threshold used to identify the symbol boundary is dynamically calculated on a per-packet basis, eliminating errors due to varying energy levels or propagation characteristics from different packet sources; moreover, the median autocorrelation value minimizes effects due to noise components, minimizing false detection errors.
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Hou Ping
Hwang Chien-Meen
Lee Christine
Zhou Xu
Advanced Micro Devices , Inc.
Ghebretinsae Temesghen
Manelli Denison & Selter PLLC
Torres Juan Alberto
Turkevich Leon R.
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