Method and apparatus for reducing frame error rate through signal power adjustment
AssigneeQUALCOMM Incorporated
InventorLeonard N. Schiff
Life of this patent
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Abstract
A method and apparatus for controlling a signal transmission power. The method of the present invention includes the steps of demodulating a received signal to produce a demodulated signal and distorting the demodulated signal to produce a distorted demodulated signal. The demodulated signal can be distorted by, for example, adding noise. A signal quality measurement, such as signal-to-noise ratio, is then determined based on the distorted demodulated signal rather than the demodulated signal. An adjustment in the transmission power is then requested based on the signal quality measurement of the distorted demodulated signal.
Claims35
A method for controlling a signal transmission power, comprising the steps of:
- (a) demodulating a received signal to produce a demodulated signal;
- (b) distorting said demodulated signal to produce a distorted demodulated signal;
- (c) determining a signal quality measurement based on said distorted demodulated signal which represents a value directly proportional to signal quality;
- (d) requesting an adjustment in the transmission power based on said signal quality measurement comprising:
- (i) comparing said determined signal quality measurement to a preselected threshold value;
- and
- (ii) requesting an increase in transmission power if said signal quality measurement exceeds said threshold;
- (e) decoding said demodulated signal to produce decision data;
- (f) decoding said distorted demodulated signal to produce distorted decision data;
- (g) determining a second signal quality measurement based on said distorted decision data;
- and
- (h) adjusting said threshold based on said second signal quality measurement.
An apparatus for controlling a signal transmission power, comprising:
- a demodulator for demodulating a received signal to produce a demodulated signal;
- a decoder for decoding said demodulated signal to produce decision data;
- a distorter for distorting said demodulated signal to produce a distorted demodulated signal;
- a virtual decoder for decoding said distorted demodulated signal to produce distorted decision data;
- a signal quality estimator for determining a first signal quality measurement based on said distorted demodulated signal which represents a value directly proportional to signal quality;
- an error detector for determining a second signal quality measurement based on said distorted decision data;
- and
- a power command generator for requesting an adjustment in the transmission power based on said first signal quality measurement by comparing it to a threshold and requesting an increase in the transmission power if the first signal quality measurement exceeds said threshold.
Dependencies are inferred from the claim text.