Method of improving sensitivity and interference rejection in wireless receivers
First Claim
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1. A wireless receiver for enhancing sensitivity and interference rejection, comprising:
- a RF front end for receiving a signal with an asynchronous characteristic pattern;
a pattern discriminator coupled to the RF front end for detecting the characteristic pattern in the received signal in an asynchronous mode, the pattern discriminator arranged to save power if the received signal is not identifiable;
a predictor coupled to the RF front end and arranged to determine a noise floor, and predict, responsive to the determined noise floor, the presence of non-zero values of a subsequently received portion of the received signal in pseudo synchronous mode wherein the pattern is almost coherent;
a tracker connected with said predictor via a control bus for receiving the predicted non-zero values from the predictor, the tracker tracking a noise component in the received signal between the received non-zero values;
a subtractor connected with said tracker for subtracting the noise component from the received signal to output a processed signal;
a demodulator connected with said subtractor for demodulating the processed signal; and
a comparator connected with said pattern discriminator, said predictor and said demodulator for comparing the outputs thereof to produce a quantized data output signal.
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Abstract
A wireless receiver for receiving a signal with a characteristic pattern includes a predictor for predicting the presence of a non-zero value of the characteristic pattern. A tracker tracks a noise component in the received signal between predicted non-zero values. The resulting noise component is subtracted from the received signal to output a processed signal, which is then decoded by a pattern discriminator and demodulator. The wireless receiver is less sensitive to noise and interference.
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18 Claims
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1. A wireless receiver for enhancing sensitivity and interference rejection, comprising:
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a RF front end for receiving a signal with an asynchronous characteristic pattern; a pattern discriminator coupled to the RF front end for detecting the characteristic pattern in the received signal in an asynchronous mode, the pattern discriminator arranged to save power if the received signal is not identifiable; a predictor coupled to the RF front end and arranged to determine a noise floor, and predict, responsive to the determined noise floor, the presence of non-zero values of a subsequently received portion of the received signal in pseudo synchronous mode wherein the pattern is almost coherent; a tracker connected with said predictor via a control bus for receiving the predicted non-zero values from the predictor, the tracker tracking a noise component in the received signal between the received non-zero values; a subtractor connected with said tracker for subtracting the noise component from the received signal to output a processed signal; a demodulator connected with said subtractor for demodulating the processed signal; and a comparator connected with said pattern discriminator, said predictor and said demodulator for comparing the outputs thereof to produce a quantized data output signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of enhancing sensitivity and interference rejection in a receiver, the method comprising the steps of:
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receiving an RF signal with an asynchronous characteristic pattern; detecting the asynchronous characteristic pattern in the received RF signal in an asynchronous mode; operating to save power if the received RF signal is not identifiable; determining a noise floor to predict the presence of non-zero values of a subsequently received portion of the received RF signal in pseudo synchronous mode wherein the asynchronous characteristic pattern is almost coherent; tracking a noise component in the received RF signal between the predicted non-zero values; subtracting the noise component from the received RF signal to output a processed signal; demodulating the processed signal; and comparing the processed signal with the received RF signal to produce a quantized output signal. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification