Telecommunications – Receiver or analog modulated signal frequency converter – Local control of receiver operation
Reexamination Certificate
2006-06-13
2006-06-13
Cumming, William (Department: 2684)
Telecommunications
Receiver or analog modulated signal frequency converter
Local control of receiver operation
C455S277200, C315S371000, C348S497000
Reexamination Certificate
active
07062242
ABSTRACT:
A DPRAM is placed in the RF path before the digital to analog converter, to provide dynamic path gain compensation to the digital signal prior to conversion to an analog signal. The DPRAM stores corrections to the signal to compensate for amplitude losses in the signal arising from heat and non-linearities. The DPRAM has two sets of identical addresses. A logic switch, alternately directs an input signal to one of the two sets of addresses. Pre-calculated signal values which compensate for path gain are stored in one of the two sets of addresses in the DPRAM. The signal input to the DPRAM is directed to the other block. The value of the signal input to the DPRAM will determine the address to which the new value can be found. It is this new value which is actually input to the DAC and from which an analog signal is created. The updated values written to the DPRAM are the signal values with path gain compensation that is independently calculated and applied to the RF signal by a Dynamic Path Gain Compensation Controller (“DPGCC”). The DPGCC may apply any known algorithms to compute the path gain compensation and adjust the signal accordingly. In one advantageous embodiment the DPGCC accounts for thermal losses and non-linearity and takes into consideration overdrive protection constraints.
REFERENCES:
patent: 4532541 (1985-07-01), Cooper
patent: 5883477 (1999-03-01), Wilber
patent: 6507732 (2003-01-01), Dajer et al.
Dajer Miguel
Eibling Edward Ellis
McKinnon Mark Y.
Cumming William
Lucent Technologies - Inc.
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