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US 7,606,329 B2Granted
Data receiver adaptively operable to received signal strength indication
AssigneeOki Semiconductor Co., Ltd.
InventorShigeki Yamauchi
Life of this patent
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Abstract
The modem has an RF section developing an RSSI signal and a baseband signal converted from a received signal. A reference voltage output section feeds a reference voltage to a comparator. The comparator outputs, when the RSSI signal is higher in level than the reference voltage, a control signal to the RF section, an A/D converter and a demodulator of a receiver modem. The modem thus provides a data receiver capable of reducing power consumption in the entire system, while maintaining a reliable detection of received signals.
Claims11
A data receiver comprising:
- a frequency converter for receiving a radio frequency signal and converting the radio frequency signal received to a baseband signal;
- an RSSI (Received Signal Strength Indication) signal generator for outputting an RSSI signal indicating a received strength indication level of the radio frequency signal;
- a digitizer for digitalizing the baseband signal to output data;
- a receiver demodulator for demodulating the data to output a demodulated signal;
- a comparator for comparing a level of the RSSI signal with a reference level to output a control signal for controlling operation according to a result from comparison to said frequency converter said digitizer and said receiver demodulator;
- and
- an adjusting circuit operative in response to the demodulated signal for adjusting the reference level;
- wherein said adjusting circuit is provided with a set value for comparison, calculates a difference of the reference level currently set with the set value for comparison, and operates the difference calculated on a basis of the demodulated signal to produce a new reference level.
5 more elements
A data receiver comprising:
- a frequency converter for receiving a radio frequency signal and converting the radio frequency signal received to a baseband signal;
- an RSSI (Received Signal Strength Indication) signal generator for outputting an RSSI signal indicating a received strength indication level of the radio frequency signal;
- a digitizer for digitalizing the baseband signal to output data;
- a receiver demodulator for demodulating the data to output a demodulated signal;
- an averaging circuit for digitalizing the RSSI signal and averaging the RSSI signal digitalized with each of a plurality of averaging parameters to produce a corresponding plurality of average data;
- and
- a signal detector for comparing each of the plurality of average data with a predetermined reference level in response to an error detection, and producing a control signal for operation according to a result of comparison to said frequency converter, said digitizer and said receiver demodulator.
4 more elements
A data receiver comprising:
- a frequency converter for receiving a radio frequency signal and converting the radio frequency signal received to a baseband signal;
- an RSSI (Received Signal Strength Indication) signal generator for outputting an RSSI signal indicating a received strength indication level of the radio frequency signal;
- a first convener for digitalizing the baseband signal to output digitized baseband data;
- a second converter for digitalizing the RSSI signal produced to output RSSI data;
- a receiver demodulator for demodulating the baseband data to output a demodulated signal;
- a first monitoring circuit for demodulating the digitized baseband data, and monitoring a favorable peripheral environment on a basis of the digitized baseband data;
- a second monitoring circuit for monitoring deterioration of the peripheral environment on a basis of the RSSI data to control operations of said frequency converter, said first converter and said first monitoring circuit;
- and
- an output control circuit operative in response to said first and second monitoring circuits for producing a permission signal of operation to control operation of said first and second monitoring circuits.
6 more elements
Dependencies are inferred from the claim text.