Multiplex communications – Duplex – Transmit/receive interaction control
Reexamination Certificate
2011-03-15
2011-03-15
Pham, Chi H (Department: 2471)
Multiplex communications
Duplex
Transmit/receive interaction control
C370S311000, C375S316000
Reexamination Certificate
active
07907555
ABSTRACT:
A wireless receiver generates quadrature baseband signals which are sampled by a high speed analog to digital converter (IQ ADC) and also uses a receive signal strength indicator (RSSI) which is sampled by an RSSI analog to digital converter (RSSI ADC). The RSSI ADC signal is processed in combination with an end of packet signal to generate a first threshold from the average RSSI signal after the end of packet with the receive amplifiers set to a comparatively high level. A second threshold is generated by adding a threshold increment to the first threshold, and when the RSSI crosses the second threshold, the IQ ADC is taken out of a standby mode and placed in an active mode for the duration of the packet. The RSSI ADC is enabled from end of packet until packet detection by the baseband processor, and placed in standby at other times. The enabling of each respective ADC only when required reduces power consumption, and the formation of the first and second thresholds after end of packet generates a self-calibrating RSSI signal for use in enabling and disabling the IQ ADC and RSSI ADC.
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Mattela Venkat
Murali Partha Sarathy
Sankabathula Dharani Naga Sailaja
Chesavage Jay A.
File-EE-Patents.com
Hyun Soon-Dong D
Pham Chi H
Redpine Signals, Inc.
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