US20150063504A1 - Digital Receiver System Activated by RSSI Signal - Google Patents
Digital Receiver System Activated by RSSI Signal Download PDFInfo
- Publication number
- US20150063504A1 US20150063504A1 US14/013,043 US201314013043A US2015063504A1 US 20150063504 A1 US20150063504 A1 US 20150063504A1 US 201314013043 A US201314013043 A US 201314013043A US 2015063504 A1 US2015063504 A1 US 2015063504A1
- Authority
- US
- United States
- Prior art keywords
- digital
- strength indicator
- received signal
- signal strength
- output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3036—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
- H03G3/001—Digital control of analog signals
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3052—Automatic control in amplifiers having semiconductor devices in bandpass amplifiers (H.F. or I.F.) or in frequency-changers used in a (super)heterodyne receiver
- H03G3/3078—Circuits generating control signals for digitally modulated signals
Definitions
- This application relates to a digital receiver, and more specifically, to turning off digital circuits within the digital receiver according to a received signal strength indicator (RSSI).
- RSSI received signal strength indicator
- RSSI is often included to determine the received signal or interference level within a certain predetermined signal bandwidth. In addition to determining the signal or interference level, RSSI is also used for clear channel assessment and automatic gain control.
- the transmitted signal In a digital communication system, the transmitted signal must use certain data patterns, for example a predefined preamble, so that the receiver can sync and decode the transmitted signal.
- the transmitted data package can get lost.
- the first scenario is missed detection, which means that when the transmitted data package is presented at the receiver, the receiver cannot correctly receive and decode it.
- the second scenario can occur after a false alarm, which means that when there is no data package presented at the receiver, the digital processing unit mistakenly starts to process a nonexistent package.
- the digital processing unit may receive an erroneous signal due to noise or the like and begin processing the erroneous signal.
- FIG. 1 illustrates a false alarm scenario 100 .
- packets 110 and 130 are being received sequentially from left to right.
- the first two packets 110 are received and processed normally.
- a false alarm occurs.
- packet 130 arrives at the receiver.
- detection of the packet 130 is missed because it arrived during a time window shown as T drop where the digital processing unit is recovering from the false alarm 120 and is unable to correctly process the packet 130 . Therefore, it is very necessary to reduce or remove the above mentioned situation.
- a digital receiver comprises a radio frequency analog front end, a digital processing unit, a plurality of cascaded amplifier stages configured to receive output of the radio frequency analog front end, a first analog to digital converter configured to convert an analog signal output from the plurality of cascaded amplifier stages into a digital signal output to the digital processor, a first received signal strength indicator unit configured to receive outputs of each of the plurality of cascaded amplifier stages and output signal to the digital processing unit, a second received signal strength indicator unit configured to receive output of at least one amplifier stage in the plurality of cascaded amplifier stages, and a received signal strength indicator detection unit configured to activate and to deactivate the digital processing unit according to a comparison of output from the second received signal strength indicator unit to a predetermined threshold.
- the digital receiver may be further configured to deactivate the first received signal strength indicator unit when the digital processing unit is deactivated by the received signal strength indicator detection unit.
- Another digital receiver comprises a radio frequency analog front end, a digital processing unit, a plurality of cascaded amplifier stages configured to receive output of the radio frequency analog front end, a 1-bit analog to digital converter configured to convert an analog signal output from the plurality of cascaded amplifier stages into a digital signal output to the digital processor, a first received signal strength indicator unit configured to receive outputs of each of the plurality of cascaded amplifier stages and output signal to the digital processing unit, a second received signal strength indicator unit configured to receive output of at least one amplifier stage in the plurality of cascaded amplifier stages, and a received signal strength indicator detection unit configured to activate and deactivate the digital processing unit according to a comparison of output from the second received signal strength indicator unit to a predetermined threshold.
- the digital receiver may be further configured to deactivate the first received signal strength indicator unit when the digital processing unit is deactivated by the received signal strength indicator detection unit.
- a method of operating a digital receiver comprising a radio frequency analog front end, a digital processing unit, a plurality of cascaded amplifiers configured to receive output of the radio frequency analog front end, a first analog to digital converter configured to convert an analog signal output from the plurality of cascaded amplifiers into a digital signal output to the digital processor, and a first received signal strength indicator unit configured to receive outputs of each of the plurality of cascaded amplifiers and output signal to the digital processing unit is proposed.
- the method comprises receiving output of at least one amplifier in the plurality of cascaded amplifiers to generate an received signal strength indicator signal, comparing the received signal strength indicator signal to a predetermined threshold to generate a comparison result, and activating the digital processing unit according to a the comparison result.
- the digital receiver may be further configured to deactivate the first received signal strength indicator unit when the digital processing unit is deactivated by the received signal strength indicator detection unit.
- FIG. 1 illustrates a missed packet due to a false alarm.
- FIG. 2 illustrates an expanded RSSI curve according to one embodiment.
- FIG. 3 is a functional block diagram of a digital receiver according to one embodiment.
- the RF signal may be down converted to intermediate frequency (IF) and then amplified.
- IF intermediate frequency
- the IF amplifier comprises cascaded multi-stage amplifiers, and the regular RSSI unit can plot a curve corresponding to the strength of the signal according to the output signal of each IF amplifier. In order to have a high dynamic range of RSSI, a large number of stages are required, resulting in high power consumption.
- FIG. 2 illustrates an expanded RSSI curve according to one embodiment.
- FIG. 2 shows the RSSI in volts as the vertical axis, and power in a power ratio in decibels of the measured power referenced to one milli-watt (dBm) as the horizontal axis.
- the expected power region for RSSI detection extends from “A” to “B” but may be extended to the vertical line shown as Receiver Sensitivity Level 230 .
- the regular RSSI curve 210 is shaped somewhat like a slash (“ ⁇ ”) during the linear region, and flat at the edges of the dynamic range.
- the use of a second RSSI curve 220 is proposed to activate and deactivate the digital unit to reduce false alarms while also reducing power consumption. Since only the second RSSI with lower stages needs to be turned on for detection, the regular RSSI can be turned off during detection and turned on only when the digital unit is needed to sample the RSSI value.
- the second RSSI curve 220 Preferred characteristics of the second RSSI curve 220 are low power consumption, have a sharp RSSI curve and the linear region must fall in the signal power level lower than the sensitivity level. This can be accomplished by adjusting the second RSSI curve 220 at the very low power end by using output from at least one last-stage amplifier as input to a second RSSI unit used for this purpose and power saving.
- the RSSI value is basically the multiplication of a full-wave rectifier output current and load resistor, adjusting the current or load resistor can change the shape of RSSI curve.
- the curve of the low power region (less than “B”) only occupies less than 5% of the curve (“C” to “D”).
- the second RSSI curve 220 could make the small DC range (“C” to “D”) extend to full range (“C” to zero volts) and discard the high power end, forming a much sharper curve. With proper design, the linear region can be farther lower than the sensitivity level.
- FIG. 3 is a functional block diagram of a digital receiver 300 according to one embodiment.
- the digital receiver 300 may comprise a channel filter 310 which outputs a received analog signal to a chain of cascaded amplifiers 320 .
- the analog output of the chain of cascaded amplifiers 320 may be converted into data by a first 1-bit analog-to-digital converter (ADC) and sent to the digital unit 360 for processing.
- ADC analog-to-digital converter
- Output of each amplifier stage 320 in the chain is also sent to the first RSSI unit 340 which outputs the corresponding signals to a second ADC 350 .
- the ADC 350 then outputs corresponding signals to the digital unit 360 .
- the digital receiver 300 also may include a second RSSI unit 370 coupled to receive output of at least one of the last amplifier stages 320 in the chain of amplifiers 320 . Because input to the second RSSI unit 370 is limited to coming from only the at least one of the last amplifier stages 320 in the chain, a different RSSI curve is generated than is generated by the first RSSI unit 340 which receives input from all of the amplifier stages 320 . When compared to the first RSSI unit 340 , the second RSSI unit 370 generates a sharper RSSI curve with the linear region falling in the signal power level lower than the sensitivity level as desired. An example of one possible sharper RSSI curve 220 is shown in FIG. 2 .
- Output of the second RSSI unit 370 is sent to the RSSI detection unit 380 where the output is compared to a predetermined threshold lower than the digital receiver's 300 sensitivity level. Only when the threshold is met or exceeded, the RSSI detection unit 380 causes the digital unit 360 to be turned on, otherwise when the threshold is not met or exceeded, the RSSI detection unit 380 causes the digital unit 360 to be turned off.
- the digital unit 360 Since the digital unit 360 is only turned on when a packet meets or exceeds the predefined threshold, the digital unit 360 does not waste the time Tdrop recognizing and recovering from false alarms, and missed packets such as packet 130 shown in FIG. 1 are no longer missed and can be processed normally.
- These embodiments further are able to reduce power consumption in at least three ways. Firstly, because the digital unit 360 is only turned on when needed, power consumption is reduced by turning the digital unit 360 off when the RSSI detection unit 380 determines the digital unit 360 is not currently needed. Secondly, by limiting input to the second RSSI unit 370 to coming from only at least one of the last amplifiers 320 in the chain, no additional amplifier stages 320 to extend the dynamic range (and additional power consumption) are needed to avoid the false alarms. Thirdly, when the digital unit 360 is turned off, the first RSSI unit 340 can also be turned off because it is also not currently needed.
- a high sensitivity, low dynamic range, and low power consumption second RSSI (or activation RSSI) unit 370 is presented.
- the dynamic range is located in the signal power level lower than the digital receiver's 300 sensitivity level, so that the digital unit 360 can be activated earlier and only when required, and prepare for receiving packet.
- the value of the output of the second RSSI unit 370 is compared with a predetermined threshold that corresponds to a specific power level.
- a full range constant voltage reference circuit may provide the predetermined threshold level, in other words, defines the turned on power level of digital units.
Abstract
Description
- 1. Field of the Invention
- This application relates to a digital receiver, and more specifically, to turning off digital circuits within the digital receiver according to a received signal strength indicator (RSSI).
- 2. Description of the Prior Art
- In typical receiver system for a digital communication system, there area radio frequency (RF) and analog unit, and a digital signal processing unit. Analog to digital converters (ADC) are used to convey transmitted information from analog domain to digital domain for digital processing and to connect these units in hardware. Within the RF and analog unit, a circuit called RSSI is often included to determine the received signal or interference level within a certain predetermined signal bandwidth. In addition to determining the signal or interference level, RSSI is also used for clear channel assessment and automatic gain control.
- In a digital communication system, the transmitted signal must use certain data patterns, for example a predefined preamble, so that the receiver can sync and decode the transmitted signal. However, in the real world, due to noise, interference, and distortion, the transmitted data package can get lost. There are two scenarios resulting in a lost package. The first scenario is missed detection, which means that when the transmitted data package is presented at the receiver, the receiver cannot correctly receive and decode it. The second scenario can occur after a false alarm, which means that when there is no data package presented at the receiver, the digital processing unit mistakenly starts to process a nonexistent package. For example, the digital processing unit may receive an erroneous signal due to noise or the like and begin processing the erroneous signal. Since it takes a certain amount of time for the digital processing unit to determine that the erroneous signal is not a valid packet but a false alarm, if a real data package arrives when the receiver has not yet recovered from the false alarm, missed detection of the real data package may occur.
- Please refer to
FIG. 1 , which illustrates afalse alarm scenario 100. InFIG. 1 ,packets packets 110 are received and processed normally. Attime point 120, a false alarm occurs. Shortly after thefalse alarm 120 occurs,packet 130 arrives at the receiver. However, detection of thepacket 130 is missed because it arrived during a time window shown as Tdrop where the digital processing unit is recovering from thefalse alarm 120 and is unable to correctly process thepacket 130. Therefore, it is very necessary to reduce or remove the above mentioned situation. - A digital receiver is proposed that comprises a radio frequency analog front end, a digital processing unit, a plurality of cascaded amplifier stages configured to receive output of the radio frequency analog front end, a first analog to digital converter configured to convert an analog signal output from the plurality of cascaded amplifier stages into a digital signal output to the digital processor, a first received signal strength indicator unit configured to receive outputs of each of the plurality of cascaded amplifier stages and output signal to the digital processing unit, a second received signal strength indicator unit configured to receive output of at least one amplifier stage in the plurality of cascaded amplifier stages, and a received signal strength indicator detection unit configured to activate and to deactivate the digital processing unit according to a comparison of output from the second received signal strength indicator unit to a predetermined threshold. The digital receiver may be further configured to deactivate the first received signal strength indicator unit when the digital processing unit is deactivated by the received signal strength indicator detection unit.
- Another digital receiver is proposed that comprises a radio frequency analog front end, a digital processing unit, a plurality of cascaded amplifier stages configured to receive output of the radio frequency analog front end, a 1-bit analog to digital converter configured to convert an analog signal output from the plurality of cascaded amplifier stages into a digital signal output to the digital processor, a first received signal strength indicator unit configured to receive outputs of each of the plurality of cascaded amplifier stages and output signal to the digital processing unit, a second received signal strength indicator unit configured to receive output of at least one amplifier stage in the plurality of cascaded amplifier stages, and a received signal strength indicator detection unit configured to activate and deactivate the digital processing unit according to a comparison of output from the second received signal strength indicator unit to a predetermined threshold. The digital receiver may be further configured to deactivate the first received signal strength indicator unit when the digital processing unit is deactivated by the received signal strength indicator detection unit.
- A method of operating a digital receiver comprising a radio frequency analog front end, a digital processing unit, a plurality of cascaded amplifiers configured to receive output of the radio frequency analog front end, a first analog to digital converter configured to convert an analog signal output from the plurality of cascaded amplifiers into a digital signal output to the digital processor, and a first received signal strength indicator unit configured to receive outputs of each of the plurality of cascaded amplifiers and output signal to the digital processing unit is proposed. The method comprises receiving output of at least one amplifier in the plurality of cascaded amplifiers to generate an received signal strength indicator signal, comparing the received signal strength indicator signal to a predetermined threshold to generate a comparison result, and activating the digital processing unit according to a the comparison result. The digital receiver may be further configured to deactivate the first received signal strength indicator unit when the digital processing unit is deactivated by the received signal strength indicator detection unit.
- These and other objectives of the present invention will no doubt become obvious to those of ordinary skill in the art after reading the following detailed description of the preferred embodiment that is illustrated in the various figures and drawings.
-
FIG. 1 illustrates a missed packet due to a false alarm. -
FIG. 2 illustrates an expanded RSSI curve according to one embodiment. -
FIG. 3 is a functional block diagram of a digital receiver according to one embodiment. - In a receiver system having an RF/analog front end, the RF signal may be down converted to intermediate frequency (IF) and then amplified. The IF amplifier comprises cascaded multi-stage amplifiers, and the regular RSSI unit can plot a curve corresponding to the strength of the signal according to the output signal of each IF amplifier. In order to have a high dynamic range of RSSI, a large number of stages are required, resulting in high power consumption.
- Please refer to
FIG. 2 that illustrates an expanded RSSI curve according to one embodiment.FIG. 2 shows the RSSI in volts as the vertical axis, and power in a power ratio in decibels of the measured power referenced to one milli-watt (dBm) as the horizontal axis. The expected power region for RSSI detection extends from “A” to “B” but may be extended to the vertical line shown asReceiver Sensitivity Level 230. Unfortunately, theregular RSSI curve 210 is shaped somewhat like a slash (“\”) during the linear region, and flat at the edges of the dynamic range. This means it is difficult to define a threshold direct current (DC) level for a comparator at a signal power level lower than thesensitivity level 230 because there is little change in voltage (from “C” to “D”) of the RSSI within this region and a wide range of power would correspond quite closely to the DC level. Choosing a DC level that falls within the linear region of the RSSI curve may solve this problem, but the linear region of the RSSI curve falls in the signal power level higher than the sensitivity level and it is not acceptable to sacrifice the sensitivity of a receiver. Additional amplifier stages can extend the linear region to a wanted power level, but it also means more power consumption when the receiver is not receiving packets. - To extend the useful dynamic range of the RSSI curve without the need for a larger number of RSSI stages, the use of a
second RSSI curve 220 is proposed to activate and deactivate the digital unit to reduce false alarms while also reducing power consumption. Since only the second RSSI with lower stages needs to be turned on for detection, the regular RSSI can be turned off during detection and turned on only when the digital unit is needed to sample the RSSI value. - Preferred characteristics of the
second RSSI curve 220 are low power consumption, have a sharp RSSI curve and the linear region must fall in the signal power level lower than the sensitivity level. This can be accomplished by adjusting thesecond RSSI curve 220 at the very low power end by using output from at least one last-stage amplifier as input to a second RSSI unit used for this purpose and power saving. The RSSI value is basically the multiplication of a full-wave rectifier output current and load resistor, adjusting the current or load resistor can change the shape of RSSI curve. In theregular RSSI curve 210, the curve of the low power region (less than “B”) only occupies less than 5% of the curve (“C” to “D”). Thesecond RSSI curve 220 could make the small DC range (“C” to “D”) extend to full range (“C” to zero volts) and discard the high power end, forming a much sharper curve. With proper design, the linear region can be farther lower than the sensitivity level. - Please refer to
FIG. 3 , which is a functional block diagram of adigital receiver 300 according to one embodiment. Thedigital receiver 300 may comprise achannel filter 310 which outputs a received analog signal to a chain ofcascaded amplifiers 320. The analog output of the chain ofcascaded amplifiers 320 may be converted into data by a first 1-bit analog-to-digital converter (ADC) and sent to thedigital unit 360 for processing. Output of eachamplifier stage 320 in the chain is also sent to thefirst RSSI unit 340 which outputs the corresponding signals to asecond ADC 350. The ADC 350 then outputs corresponding signals to thedigital unit 360. - One of the differences between the
digital receiver 300 and digital receivers in the prior art is that thedigital receiver 300 also may include asecond RSSI unit 370 coupled to receive output of at least one of thelast amplifier stages 320 in the chain ofamplifiers 320. Because input to thesecond RSSI unit 370 is limited to coming from only the at least one of thelast amplifier stages 320 in the chain, a different RSSI curve is generated than is generated by thefirst RSSI unit 340 which receives input from all of theamplifier stages 320. When compared to thefirst RSSI unit 340, thesecond RSSI unit 370 generates a sharper RSSI curve with the linear region falling in the signal power level lower than the sensitivity level as desired. An example of one possiblesharper RSSI curve 220 is shown inFIG. 2 . - Output of the
second RSSI unit 370 is sent to theRSSI detection unit 380 where the output is compared to a predetermined threshold lower than the digital receiver's 300 sensitivity level. Only when the threshold is met or exceeded, theRSSI detection unit 380 causes thedigital unit 360 to be turned on, otherwise when the threshold is not met or exceeded, theRSSI detection unit 380 causes thedigital unit 360 to be turned off. - Because the RSSI curve generated by the
second RSSI unit 370 has the linear portion of the RSSI curve lower than the sensitivity level, a suitable threshold indicating whether the received packet is a false alarm can be found experimentally that does not sacrifice the sensitivity of a receiver. Since thedigital unit 360 is only turned on when a packet meets or exceeds the predefined threshold, thedigital unit 360 does not waste the timeTdrop recognizing and recovering from false alarms, and missed packets such aspacket 130 shown inFIG. 1 are no longer missed and can be processed normally. - These embodiments further are able to reduce power consumption in at least three ways. Firstly, because the
digital unit 360 is only turned on when needed, power consumption is reduced by turning thedigital unit 360 off when theRSSI detection unit 380 determines thedigital unit 360 is not currently needed. Secondly, by limiting input to thesecond RSSI unit 370 to coming from only at least one of thelast amplifiers 320 in the chain, no additional amplifier stages 320 to extend the dynamic range (and additional power consumption) are needed to avoid the false alarms. Thirdly, when thedigital unit 360 is turned off, thefirst RSSI unit 340 can also be turned off because it is also not currently needed. - A high sensitivity, low dynamic range, and low power consumption second RSSI (or activation RSSI)
unit 370 is presented. The dynamic range is located in the signal power level lower than the digital receiver's 300 sensitivity level, so that thedigital unit 360 can be activated earlier and only when required, and prepare for receiving packet. The value of the output of thesecond RSSI unit 370 is compared with a predetermined threshold that corresponds to a specific power level. A full range constant voltage reference circuit may provide the predetermined threshold level, in other words, defines the turned on power level of digital units. Once thesecond RSSI unit 370 output value meets or exceeds the predetermined threshold, the output of theRSSI detection unit 380 pulls high and activatesdigital unit 360. When output of theRSSI detection unit 380 is low so that thedigital unit 360 is deactivated, theregular RSSI unit 340 may also be deactivated. - Those skilled in the art will readily observe that numerous modifications and alterations of the device and method may be made while retaining the teachings of the invention. Accordingly, the above disclosure should be construed as limited only by the metes and bounds of the appended claims.
Claims (20)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/013,043 US8971453B1 (en) | 2013-08-29 | 2013-08-29 | Digital receiver system activated by RSSI signal |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/013,043 US8971453B1 (en) | 2013-08-29 | 2013-08-29 | Digital receiver system activated by RSSI signal |
Publications (2)
Publication Number | Publication Date |
---|---|
US8971453B1 US8971453B1 (en) | 2015-03-03 |
US20150063504A1 true US20150063504A1 (en) | 2015-03-05 |
Family
ID=52575131
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/013,043 Expired - Fee Related US8971453B1 (en) | 2013-08-29 | 2013-08-29 | Digital receiver system activated by RSSI signal |
Country Status (1)
Country | Link |
---|---|
US (1) | US8971453B1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2018126247A3 (en) * | 2017-01-02 | 2018-08-09 | Mojoose, Inc. | Automatic signal strength indicator and automatic antenna switch |
US10630309B1 (en) * | 2019-04-18 | 2020-04-21 | Uniband Electronic Corp. | Signal receiver for radio signal strength indication estimation with sub-sampling analog-to-digital converter for radio frequency signal with constant envelope modulation |
WO2022169593A1 (en) * | 2021-02-02 | 2022-08-11 | Northeastern University | Ultra low power wake up radio architecture |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7203471B2 (en) * | 2002-12-30 | 2007-04-10 | Motorola, Inc. | System and method for selectively utilizing an attenuation device in a two-way radio receiver based on squelch detect and radio signal strength indication (RSSI) |
US7218896B1 (en) * | 2003-12-21 | 2007-05-15 | Redpine Signals, Inc. | Multiplexed wireless receiver and transmitter |
WO2007001266A1 (en) * | 2005-06-16 | 2007-01-04 | Thomson Licensing S.A. | Automated alert for mobile personal video recording device |
KR100793298B1 (en) * | 2006-10-16 | 2008-01-10 | 삼성전자주식회사 | Method for selecting reception mode of dual receiver-based mobile terminal |
GB0703883D0 (en) * | 2007-02-28 | 2007-04-11 | Cambridge Silicon Radio Ltd | Receiver gain control |
US7907555B1 (en) * | 2007-11-26 | 2011-03-15 | Redpine Signals, Inc. | RSSI-based powerdown apparatus and method for a wireless communications system |
US7920839B2 (en) * | 2008-02-04 | 2011-04-05 | Skyworks Solutions, Inc. | System and method for station detection and seek in a radio receiver |
US7999738B2 (en) * | 2009-05-19 | 2011-08-16 | Arsen Melconian | Systems and methods for tracking a remote source and orientation control |
WO2011060449A1 (en) * | 2009-11-16 | 2011-05-19 | Maxlinear, Inc. | Diversity blocker protection |
WO2011094284A1 (en) * | 2010-01-26 | 2011-08-04 | Maxlinear, Inc. | Diversity receiver |
US9013975B2 (en) * | 2011-09-30 | 2015-04-21 | Silicon Laboratories Inc. | Receiver with collision detection and method therefor |
US8675535B2 (en) * | 2012-01-11 | 2014-03-18 | Qualcomm Incorporated | Reducing power consumption in a mobile communication device in response to motion detection |
US8571152B1 (en) * | 2012-05-22 | 2013-10-29 | Issc Technologies Corp. | Power-saving apparatus used for wireless communication receiver and system, and method using the same |
US20140073278A1 (en) * | 2012-09-10 | 2014-03-13 | Uniband Electronic Corp. | RSSI estimation based on VGA control and threshold detection |
CN106330269B (en) * | 2012-09-14 | 2019-01-01 | 凯萨股份有限公司 | Wireless connection with virtual magnetic hysteresis |
US8588719B1 (en) * | 2012-09-17 | 2013-11-19 | Broadcom Corporation | Low power automatic gain control |
-
2013
- 2013-08-29 US US14/013,043 patent/US8971453B1/en not_active Expired - Fee Related
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2018126247A3 (en) * | 2017-01-02 | 2018-08-09 | Mojoose, Inc. | Automatic signal strength indicator and automatic antenna switch |
US11057130B2 (en) | 2017-01-02 | 2021-07-06 | Mojoose, Inc. | Automatic signal strength indicator and automatic antenna switch |
US11843425B2 (en) | 2017-01-02 | 2023-12-12 | Mojoose, Inc. | Automatic signal strength indicator and automatic antenna switch |
US10630309B1 (en) * | 2019-04-18 | 2020-04-21 | Uniband Electronic Corp. | Signal receiver for radio signal strength indication estimation with sub-sampling analog-to-digital converter for radio frequency signal with constant envelope modulation |
WO2022169593A1 (en) * | 2021-02-02 | 2022-08-11 | Northeastern University | Ultra low power wake up radio architecture |
Also Published As
Publication number | Publication date |
---|---|
US8971453B1 (en) | 2015-03-03 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US9083567B2 (en) | Automatic gain control techniques for detecting RF saturation | |
US20120288043A1 (en) | Adaptive wireless communication receiver | |
US10177730B2 (en) | Packet-based radio receiver with automatic gain control | |
US9831902B2 (en) | Bluetooth smart signal receiving method and device using improved automatic gain control | |
JP5684430B2 (en) | Adaptive RF saturation detection in wireless devices implementing multiple wireless protocols | |
JP2013258717A (en) | Radio sensor for detecting wireless microphone signals and method thereof | |
JP6225041B2 (en) | Receiver | |
US8971453B1 (en) | Digital receiver system activated by RSSI signal | |
JP2015154306A (en) | Automatic gain controller, automatic gain control method, and receiver | |
US20140016489A1 (en) | Wireless communication circuit with a wideband received signal strength indicator | |
US20130342276A1 (en) | Automatic gain control device | |
US20090247106A1 (en) | Method and System for Detecting An Out Of Band Interferer in An RF Receiver | |
US10992452B2 (en) | System and method of adaptive correlation threshold for bandlimited signals | |
US9814005B2 (en) | Method and system for processing a radio frequency (RF) signal | |
US20120142297A1 (en) | Receiver | |
US9548777B2 (en) | Reception device and reception method | |
US8095100B2 (en) | Receiver with sigma-delta structure | |
CN114499561A (en) | Wireless communication receiver and automatic gain control device and control method thereof | |
US10050666B2 (en) | Devices for detecting ultra-wide band signals | |
JP2012019444A (en) | Receiver | |
CN107276604B (en) | Method and system for processing Radio Frequency (RF) signals | |
US20090190700A1 (en) | Methods and devices for processing signals transmitted via communication system | |
US20170288916A1 (en) | Method and system for controlling an amplifier of a communications device | |
US20180331877A1 (en) | Radio reciever with smart listening mode | |
WO2014093539A1 (en) | A blocking detection method and apparatus in a digital communication system |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: UNIBAND ELECTRONIC CORP., TAIWAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:FAN, YIPING;LIN, CHUN-YUAN;HUANG, SHENG-CHIA;AND OTHERS;REEL/FRAME:031105/0789 Effective date: 20130826 |
|
STCF | Information on status: patent grant |
Free format text: PATENTED CASE |
|
CC | Certificate of correction | ||
MAFP | Maintenance fee payment |
Free format text: PAYMENT OF MAINTENANCE FEE, 4TH YR, SMALL ENTITY (ORIGINAL EVENT CODE: M2551) Year of fee payment: 4 |
|
FEPP | Fee payment procedure |
Free format text: MAINTENANCE FEE REMINDER MAILED (ORIGINAL EVENT CODE: REM.); ENTITY STATUS OF PATENT OWNER: SMALL ENTITY |
|
LAPS | Lapse for failure to pay maintenance fees |
Free format text: PATENT EXPIRED FOR FAILURE TO PAY MAINTENANCE FEES (ORIGINAL EVENT CODE: EXP.); ENTITY STATUS OF PATENT OWNER: SMALL ENTITY |
|
STCH | Information on status: patent discontinuation |
Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |
|
FP | Lapsed due to failure to pay maintenance fee |
Effective date: 20230303 |