CN104135298A - Portable device - Google Patents
Portable device Download PDFInfo
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- CN104135298A CN104135298A CN201410181499.0A CN201410181499A CN104135298A CN 104135298 A CN104135298 A CN 104135298A CN 201410181499 A CN201410181499 A CN 201410181499A CN 104135298 A CN104135298 A CN 104135298A
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- Prior art keywords
- signal
- filter
- portable set
- frequency
- battery saving
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Mobile Radio Communication Systems (AREA)
Abstract
An embodiment of the invention provides a portable device for receiving broadcast information. The portable device comprises: a mixer, down-converting a radio-frequency signal with a local oscillation clock to provide an intermediate frequency signal; a filter, arranged to filter the intermediate frequency signal; and an analog-to-digital converter, converting the filtered intermediate frequency signal into a digital signal according to a sampling rate. The broadcast information is obtained according to the digital signal. The local oscillation clock has a first frequency in a normal mode and a second frequency in a power-saving mode, and the second frequency is lower than the first frequency. With the technical solution provided by the invention, power consumption of the portable device can be reduced.
Description
Technical field
The present invention relates in general to a kind of portable set, relates in particular to the method for controlling the power loss of portable set when receiving broadcasting information.
Background technology
At present, portable set (for example, tablet personal computer, notebook computer, cell phone, etc.) can pass through cellular network (for example 3G standard) and WLAN (wireless local area network) (wireless local area network, WLAN) (for example, IEEE802.11 series standard) provides wireless data service.Generally, because WLAN is used unauthorized frequency band, WLAN service exercise price is more cheap than cellular service conventionally.
The portable set that is connected to WLAN often needs stable power supply to operate in WLAN at a high speed.Yet because portable set is conventionally by the small battery powered with limited capacity, the power consumption reducing in portable set becomes more and more important.
Summary of the invention
The embodiment of the present invention provides the portable set for receiving broadcasting information.
The embodiment of the present invention provides a kind of portable set, and for receiving broadcasting information, this portable set comprises: frequency mixer, utilizes local oscillations clock to carry out down-conversion to radiofrequency signal, so that intermediate-freuqncy signal to be provided; Filter, for intermediate-freuqncy signal is carried out to filtering, and analog to digital converter, for converting filtered intermediate-freuqncy signal to digital signal according to sample rate.Broadcast message obtains according to digital signal.Local oscillations clock has first frequency and have second frequency under battery saving mode under normal mode, and this second frequency is different from this first frequency, and optional, this second frequency is lower than first frequency.Wherein, this broadcast message can receive under this battery saving mode.
Another embodiment of the present invention provides a kind of portable set, and for receiving broadcasting information, this portable set comprises: frequency mixer, utilizes local oscillations clock to carry out down-conversion to radiofrequency signal, so that intermediate-freuqncy signal to be provided; Filter, for this intermediate-freuqncy signal is carried out to filtering, and analog to digital converter, for converting filtered intermediate-freuqncy signal to digital signal according to sample rate.Broadcast message obtains according to digital signal.This filter has the exponent number of the first number in normal mode, has the exponent number of the second number under battery saving mode, and the exponent number of this second number is less than the exponent number of this first number.
The portable set that the embodiment of the present invention provides may operate in battery saving mode, to reduce the power consumption of portable set.
Accompanying drawing explanation
Fig. 1 is according to the communication system shown in one embodiment of the invention;
Fig. 2 is the portable set exemplifying according to the invention process;
Fig. 3 is the low pass filter schematic diagram exemplifying according to the invention process;
Fig. 4 is according to the portable set shown in another embodiment of the present invention;
Fig. 5 is according to the portable set shown in further embodiment of this invention.
Embodiment
As follows the specific embodiment of the present invention will be described.Following description makes those skilled in the art can manufacture or use the present invention.Any those skilled in the art, without departing from the spirit and scope of the present invention, when doing a little change and retouching, so protection scope of the present invention is when being as the criterion with claims.
Fig. 1 is the communication system 100 exemplifying according to the invention process.This communication system 100 comprises WAP (wireless access point) (wireless access point, AP) 10 and portable set 20.By using WLAN technology, portable set 20 carries out data communication or is connected to network via WAP (wireless access point) 10.In the ordinary course of things, wlan standard is defined by IEEE802.11.When not having data to be communicated by letter between WAP (wireless access point) 10 and portable set 20, portable set 20 will enter park mode, and periodically wake to receive beacon (beacon) from this WAP (wireless access point) 10 up.Beacon is the information frame periodically being sent by WAP (wireless access point) 10.Information frame comprises a plurality of information elements (IE) about WAP (wireless access point) 10.For associated with WAP (wireless access point) 10 with communicate by letter, the plurality of IE is necessary for portable set 20.When receiving beacon, portable set 20 will operate under battery saving mode, to reduce power consumption and not abandon signal diode (signal-to-noise and distortion ratio, SNDR) or adjacent-channel interference (Adjacent Channel Interference, ACI) requirement of/alternative ACI (AACI).The portable set 20 operating under battery saving mode is monitored the beacon of periodically being broadcasted by WAP (wireless access point) 10.If portable set 20 is buffered in this WAP (wireless access point) 10 by the broadcast message notification data grouping from beacon, portable set 20 will send triggering (trigger) to WAP (wireless access point) 10, for the packet being queued.In the ordinary course of things, this broadcast message comprises beacon interval (for example 102.4ms), the speed being supported (for example, the maximum rate that this WAP (wireless access point) 10 can be supported), direct sequence parameter set (for example, the channel of this WAP (wireless access point) 10 for communicating by letter), traffic indicator diagram (traffic indication map, TIM) (for example, whether this information indication WAP (wireless access point) 10 has the data that cushioned for certain base station) etc.
Fig. 2 is the portable set 200 exemplifying according to the invention process.Portable set 200 comprises antenna 210, low noise amplifier (Low-noise amplifier, LNA) 220, frequency mixer (mixer) 230, local oscillator (Local Oscillator, LO) 240, filter 250, analog to digital converter (ADC) 260, oscillator 270 and controller 280.In this embodiment, filter 250 is low pass filter (LPF).In one embodiment, filter 250 is band pass filters.If the link between portable set 200 and WAP (wireless access point) is normal, portable set 200 can carry out data communication with WAP (wireless access point), and wherein, portable set 200 operates in 20,40 or the channel width (CBW20, CBW40 or CBW80) of 80MHz.Low noise amplifier 220 is by antenna 210 received RFs (RF) signal S
rF, and according to this RF signal S
rFsignal S1 is provided, wherein, this RF signal S
rFcomprise the beacon from WAP (wireless access point).In the present embodiment, WAP (wireless access point) is only supported 20MHz channel width (only CBW20).Therefore, local oscillator 240 provides the local oscillations clock F with centre frequency
lOto frequency mixer 230.Then, frequency mixer 230, according to the bandwidth of 20MHz, utilizes local oscillations clock F
lOsignal S1 is carried out to down-conversion, so that intermediate frequency (intermediate frequency, IF) signal S2 to be provided.In the present embodiment, according to different application, IF signal S2 can be zero intermediate frequency (zero-IF) signal or Low Medium Frequency (low-IF) signal.Then, 250 couples of IF signal S2 of filter carry out filtering, so that signal S3 to be provided.In the present embodiment, the exponent number of filter 250 and bandwidth are controlled by control signal ORD and the CTRL_BW of controller 280 respectively.Then, analog to digital converter 260 is according to the sample rate F from oscillator 270
s, convert signal S3 to digital signal SD, wherein, sample rate F
sthe control signal CTRL1 that is origin self-controller 280 controls.According to digital signal SD, controller 280 can be obtained broadcast message by the beacon from WAP (wireless access point).As mentioned above, when not having data to be communicated by letter between WAP (wireless access point) and portable set 200, portable set 200 will enter park mode (for example, in a plurality of battery saving modes), and periodically wake to receive beacon from WAP (wireless access point) up.When waking up, portable set 200 is operable in two kinds of patterns and receives beacon: normal mode and battery saving mode.
In the normal mode using at an embodiment, controller 280 provides control signal ORD to keep the exponent number of filter 250, so that the exponent number of the filter 250 under normal mode is identical with the exponent number that is used to the filter 250 that executing data communicates by letter.In addition, controller 280 provides control signal CTRL1 to oscillator 270, to keep sample rate F
s, for example, sample rate F
sat 80MHz, 160MHz or higher frequency, thus avoid better the aliasing with ACI/AACI.On the contrary, during the battery saving mode that utilizes in the present embodiment, controller 280 provides control signal ORD to reduce the exponent number of filter 250, makes the exponent number of the filter 250 under battery saving mode be less than the exponent number of the filter 250 under normal mode.Therefore, the power consumption disabled and portable set 200 of the partial circuit in filter 250 is lowered.In addition, in another embodiment, controller 280 can provide control signal CTRL_BW to reduce the bandwidth of filter 250.Because bandwidth is reduced, thereby the power consumption of portable set 200 is lowered.In another embodiment, controller 280 can provide control signal CTRL1 to oscillator 270, to reduce sample rate F
sto 80MHz.Due to sample rate F
sbe lowered, the frequency of operation of ADC260 is also lowered, thereby is lowered for the power consumption of portable set 200.
Fig. 3 is the schematic diagram of the low pass filter 300 that exemplifies according to the invention process.Low pass filter 300 comprises 310,330,350 and 370 and four switches 320,340,360 and 380 of four subfilters, and wherein each subfilter is firstorder filter.In the present embodiment, the exponent number of low pass filter 300 and bandwidth are controlled by control signal ORD and CTRL_BW respectively, and wherein, control signal ORD comprises subsignal ORD_1, ORD_2, ORD_3 and ORD_4.Switch 320 is coupled between subfilter 310 and 330, switch 320 is used for according to subsignal ORD_1, optionally provides IF signal S2 or S21 as signal S22, wherein, 310 pairs of the subfilters IF signal S2 from frequency mixer (as 230 of Fig. 2) carries out filtering, to produce signal S21.For example, when subsignal ORD_1 is during in the first logic level, switch 320 provides signal S21 to subfilter 330 and switch 340, and this signal S21 is as signal S22, and this signal S21 is delivered to subfilter 330 and switch 340 from subfilter 310.When subsignal ORD_1 is during in the second logic level with the first logic level complementation, switch 320 provides IF signal S2 to subfilter 330 and switch 340, and this IF signal S2 is as signal S22.Therefore, IF signal S2 is directly sent to subfilter 330 and switch 340 from frequency mixer, and not by subfilter 310, that is, subfilter 310 is bypassed (bypass).In addition,, for intermediate-freuqncy signal S2, when subfilter 310 is bypassed, subfilter 310 is forbidden by subsignal ORD_1 simultaneously.Similarly, switch 340 is coupled between subfilter 330 and 350, and switch 340 is used for according to subsignal ORD_2, optionally provide signal S22 or S23 as signal S24, wherein, 330 pairs of the subfilters signal S22 from switch 320 carries out filtering, to produce signal S23.Switch 360 is coupled between subfilter 350 and 370, switch 360 is used for according to subsignal ORD_3, optionally provides signal S24 or S25 as signal S26, wherein, 350 pairs of the subfilters signal S24 from switch 340 carries out filtering, to produce signal S25.Switch 380 is coupled between subfilter 370 and analog to digital converter (as 260 of Fig. 2), for optionally providing signal S26 or S27 as signal S3 according to subsignal ORD_4, wherein, 370 pairs of the subfilters signal S26 from switch 360 carries out filtering, to produce signal S27.Therefore, under normal mode, do not have subfilter to be bypassed, thus the exponent number of low pass filter 300 be 4 and low pass filter there is specific bandwidth.In battery saving mode, according to various power saving demands, subfilter 310,330,350 or 370 can be bypassed.In addition, the bandwidth that can control low pass filter 300 by control signal CTRL_BW reduces, and makes the specific bandwidth in the bandwidth ratio normal mode of the low pass filter 300 in battery saving mode narrow.In one embodiment, in order further to reduce power consumption, being bypassed of all subfilters in low pass filter 300, and will directly be sent to ADC and not have filtered from the IF signal S2 of frequency mixer.It should be pointed out that in the present embodiment, the number of subfilter is to be used as an example, be not intended to limit the invention.
Fig. 4 is according to the portable set 400 shown in another embodiment of the present invention.Portable set 400 comprises antenna 410, low noise amplifier 420, frequency mixer 430, local oscillator 440, low pass filter 450, analog to digital converter 460, oscillator 470 and controller 480.Portable set 400 can carry out data communication with WAP (wireless access point).In the present embodiment, the link between portable set 400 and WAP (wireless access point) supports the channel width (CBW20/CBW40/CBW80) of 20/40/80MHz for data communication.Compare with the portable set 200 of Fig. 2, local oscillator 440 provides the local oscillations clock F with variable/adjustable centre frequency
lOto frequency mixer 430, wherein, the control signal CTRL2 of variable/adjustable centre frequency origin self-controller 480 controls.
More particularly, if WAP (wireless access point) supports the channel width of 40/80MHz to come for beacon for normal data communication and support 20MHz, portable set 400 is used to adjust local oscillations clock F
lOcentre frequency receive beacon.Therefore,, under the normal mode for normal data communication, controller 480 provides control signal CTRL2 to local oscillator 440, to the local oscillations clock F with the first centre frequency is provided
lOto frequency mixer 430, for normal data.Under battery saving mode, controller 480 provides control signal CTRL2 to local oscillator 440, to have the second centre frequency local oscillations clock F of (the second centre frequency is different from the first centre frequency) is provided
lOcome for beacon to frequency mixer 430, thus local oscillations clock F
lOfrequency change.As mentioned above, in battery saving mode, controller 480 can provide control signal CTRL1 to oscillator 470, to reduce sample rate F
s, and/or controller 480 exponent number and the bandwidth that can provide respectively control signal ORD and CTRL_BW to reduce low pass filter 450.
Fig. 5 is according to the portable set 500 shown in another embodiment of the present invention.Portable set 500 comprises antenna 510, low noise amplifier 520, frequency mixer 530, local oscillator 540, low pass filter 550, analog to digital converter 560, oscillator 570 and controller 580.Compare with the portable set 200 of Fig. 2 and the portable set 400 of Fig. 4, portable set 500 also comprises automatic gain controller (auto gain controller, AGC) 590 and received signal strength indicator analog to digital converter (received signal strength indicator ADC, RSSI ADC) 595.This RSSI ADC595 obtains RSSI value according to signal S2, and RSSI ADC595 according to sample rate (for example,, from the sample rate F of oscillator 570
s), convert RSSI value to digital signal S4.In normal mode, according to the digital signal SD from digital to analog converter 560 with from the digital signal S4 of RSSI ADC595, AGC590 provides control signal CTRL_GAIN to low noise amplifier 520 and low pass filter 550, to control the gain of low noise amplifier 520 and/or low pass filter 550.Contrary, in battery saving mode, AGC590 does not only need digital signal S4 according to digital signal SD, and control signal CTRL_GAIN is provided.Therefore, RSSI ADC595 can be disabled under battery saving mode, thereby be lowered for the power consumption of portable set 500.
Although the present invention discloses as above with preferred embodiment; so it is not in order to limit the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when doing a little change and retouching, so protection scope of the present invention is when being as the criterion with claims.
Claims (13)
1. a portable set, for receiving broadcasting information, is characterized in that, comprising:
Frequency mixer, for utilizing local oscillations clock to carry out down-conversion to radiofrequency signal, so that intermediate-freuqncy signal to be provided;
Filter, for carrying out filtering to this intermediate-freuqncy signal; And
Analog to digital converter, for according to sample rate, converts filtered intermediate-freuqncy signal to digital signal;
Wherein, this broadcast message obtains according to this digital signal, and this local oscillations clock has first frequency and have second frequency under battery saving mode under normal mode, and this second frequency is different from this first frequency.
2. portable set according to claim 1, it is characterized in that, this filter has the exponent number of the first number and the exponent number under this battery saving mode with the second number under this normal mode, and the exponent number of this second number is less than the exponent number of this first number.
3. portable set according to claim 1, is characterized in that, this filter has the first bandwidth under this normal mode, and under this battery saving mode, has the second bandwidth, and this first narrow bandwidth of this second bandwidth ratio.
4. portable set according to claim 1, is characterized in that, for the sample rate of this normal mode higher than the sample rate for this battery saving mode.
5. portable set according to claim 1, is characterized in that, this radiofrequency signal comprises this broadcast message about beacon, and wherein, this beacon is from access point, and this filter is that low pass filter and this intermediate-freuqncy signal are zero intermediate frequency signals.
6. portable set according to claim 1, is characterized in that, in this battery saving mode, this filter is bypassed, and when this filter is bypassed, according to this sample rate, this analog to digital converter converts this intermediate-freuqncy signal to this digital signal.
7. portable set according to claim 1, is characterized in that, this broadcast message receives under this battery saving mode.
8. a portable set, for receiving broadcasting information, is characterized in that, comprising:
Frequency mixer, utilizes local oscillations clock to carry out down-conversion to radiofrequency signal, so that intermediate-freuqncy signal to be provided;
Filter, for carrying out filtering to this intermediate-freuqncy signal; And
Analog to digital converter, for according to sample rate, converts filtered intermediate-freuqncy signal to digital signal;
Wherein, this broadcast message obtains according to this digital signal, and wherein, this filter has the exponent number of the first number and under battery saving mode, has the exponent number of the second number under normal mode, and the exponent number of this second number is less than the exponent number of this first number.
9. portable set according to claim 8, is characterized in that, for the sample rate of this normal mode higher than the sample rate for battery saving mode.
10. portable set according to claim 8, is characterized in that, this local oscillations clock has identical frequency under this normal mode He under this battery saving mode.
11. portable sets according to claim 8, is characterized in that, this radiofrequency signal comprises this broadcast message about beacon, and wherein, this beacon is from access point, and this filter is that low pass filter and this intermediate-freuqncy signal are zero intermediate frequency signals.
12. portable sets according to claim 8, is characterized in that, in this battery saving mode, this filter is bypassed, and when this filter is bypassed, according to this sample rate, this analog to digital converter converts this intermediate-freuqncy signal to this digital signal.
13. portable sets according to claim 8, is characterized in that, this radiofrequency signal comprises this broadcast message about beacon, and wherein, this beacon has the access point of the channel width of particular value from use.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201361819206P | 2013-05-03 | 2013-05-03 | |
| US61/819,206 | 2013-05-03 | ||
| US14/159,218 | 2014-01-20 | ||
| US14/159,218 US20140328233A1 (en) | 2013-05-03 | 2014-01-20 | Portable device for receiving broadcast information |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104135298A true CN104135298A (en) | 2014-11-05 |
Family
ID=51807850
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410181499.0A Pending CN104135298A (en) | 2013-05-03 | 2014-04-30 | Portable device |
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| CN (1) | CN104135298A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108698562A (en) * | 2016-03-01 | 2018-10-23 | 株式会社东海理化电机制作所 | Portable equipment |
| CN111756394A (en) * | 2019-03-28 | 2020-10-09 | 海能达通信股份有限公司 | Zero intermediate frequency receiver and communication equipment |
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| CN101242158A (en) * | 2008-03-07 | 2008-08-13 | 华中科技大学 | A configurable and reconstructable dynamic frequency mixer |
| US20120188925A1 (en) * | 2010-12-23 | 2012-07-26 | Electronics And Telecommunications Research Institute | Apparatus and method for transmitting/receiving data in communication system |
| US20120288043A1 (en) * | 2011-05-10 | 2012-11-15 | Issc Technologies Corp. | Adaptive wireless communication receiver |
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2014
- 2014-04-30 CN CN201410181499.0A patent/CN104135298A/en active Pending
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| CN101106390A (en) * | 2006-07-10 | 2008-01-16 | 大唐移动通信设备有限公司 | A RF signal receiving and s ending device and its method |
| CN101242158A (en) * | 2008-03-07 | 2008-08-13 | 华中科技大学 | A configurable and reconstructable dynamic frequency mixer |
| US20120188925A1 (en) * | 2010-12-23 | 2012-07-26 | Electronics And Telecommunications Research Institute | Apparatus and method for transmitting/receiving data in communication system |
| US20120288043A1 (en) * | 2011-05-10 | 2012-11-15 | Issc Technologies Corp. | Adaptive wireless communication receiver |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108698562A (en) * | 2016-03-01 | 2018-10-23 | 株式会社东海理化电机制作所 | Portable equipment |
| CN108698562B (en) * | 2016-03-01 | 2022-01-28 | 株式会社东海理化电机制作所 | Portable device |
| CN111756394A (en) * | 2019-03-28 | 2020-10-09 | 海能达通信股份有限公司 | Zero intermediate frequency receiver and communication equipment |
| CN111756394B (en) * | 2019-03-28 | 2022-02-18 | 海能达通信股份有限公司 | Zero intermediate frequency receiver and communication equipment |
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Application publication date: 20141105 |