CN1585285A - Gain control method and system for wireless communication system - Google Patents
Gain control method and system for wireless communication system Download PDFInfo
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- CN1585285A CN1585285A CNA031551491A CN03155149A CN1585285A CN 1585285 A CN1585285 A CN 1585285A CN A031551491 A CNA031551491 A CN A031551491A CN 03155149 A CN03155149 A CN 03155149A CN 1585285 A CN1585285 A CN 1585285A
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Abstract
The gain controlled method and system is applied on the wireless communication system, by utilizing the time interal between of frames of the wireless communication signal, the information of the background noise is obtained. By coordinating with the intensity of the wireless communication signal, after proper computation, a feedback signal is exported to adjust the gain value of the system. The received signal is optimized to obtain the signal with excellent quality and enough intensity.
Description
Technical field
The present invention relates to a kind of gain control method and system, relate in particular to a kind of by obtaining wireless communication signal background noise information and strength information to realize optimized gain control method of received signal quality and system.
Background technology
Along with developing rapidly of internet, people get used to receiving information in large quantities fast, the particularly progress of individual mobile science and technology in recent years, individual mobile product, as products such as mobile phone, personal digital assistants, spread to quite surprising speed in everyone life.
Individual's mobile product is to replace the connected mode that wire communication utilizes electric wire with radio communication, realize whenever and wherever possible can both free communication purpose.See also Fig. 1, this is the traditional wireless communication structure chart.Traditional wireless communication comprises: receiving element 1, processing unit 2, transmitter unit 3 and antenna element 4.By antenna element 4, receiving element 1 receives wireless communication signal 10; Processing unit 2 connects this receiving element 1, the wireless communication signal 10 that receiving element 1 is received is handled through suitable, as remove high-frequency noise, quantize etc., convert the form that the user needs to, as voice, data etc., export the user to, and receive the signal of user's forms such as voice, data, convert the signal of appropriate format to, be sent to transmitter unit 3; The signal that transmitter unit 3 sends processing unit 2 is launched by antenna element 4 after power amplification again.
Yet, radio communication is subjected to the influence of environment very big, space attenuation in the environment (space attenuation), loss (loss), reflection (reflection), revolution (rotation), additive noise (added noise), and the factors such as (interference) of interference all can influence communication quality or increase the error rate of transfer of data, therefore present receiving element all can be according to the signal strength signal intensity that is received (Signal Strength), adjust gain (gain) value of receiving element, to change the intensity of received signal.So-called yield value is the ratio of receiving element power output to input power, the ability that its performance receiving element amplifies signal.Yet noise is exaggerated too in the process of amplification, causes signal receiving quality to improve synchronously, and the degree of difficulty that demodulation and signal are differentiated improves, and therefore needs the method and system of a kind of reduction and steady noise, signal is received be tending towards optimization.
Summary of the invention
At above-mentioned defective, the object of the invention is to provide a kind of gain control method and system that is applied to wireless telecommunication system, to realize the received signal quality optimization.
The invention provides a kind of gain control method that is applied to wireless telecommunication system, comprise following steps at least: receive a wireless communication signal; Obtain a signal strength signal intensity (Signal Strength) information from this wireless communication signal; Time interval in this wireless communication signal between continuous two frames (Frame) (Time Interval) is obtained a noise (Noise) information; According to the computing of this signal strength information and this noise information, produce a back coupling control signal; And, adjust a yield value according to this back coupling control signal.And a kind of gain control system that is applied to wireless telecommunication system, comprise at least: a wireless signal receiving system, in order to receive a wireless communication signal; One signal sampling device is coupled to this wireless signal receiving system, in order to obtain a signal strength signal intensity (Signal Strength) information in this wireless communication signal certainly; One noise samples device is coupled to this wireless signal receiving system, obtains a noise (Noise) information in order to the time interval (Time Interval) between continuous two frames (Frame) in this wireless communication signal certainly; An and coupling apparatus, be coupled to this wireless signal receiving system, this signal sampling device and this noise samples device, according to this signal strength information and this noise information, produce one and feedback control signal, and will feedback control signal and be sent to this wireless signal receiving system to adjust a yield value of this wireless signal receiving system.
The present invention utilizes the frame (Frame) of wireless communication signal and the time interval (Time Interval) of interframe, obtain the noise information of background noise, the strength information that cooperates wireless communication signal, after suitable computing, output one back coupling control signal, to adjust a yield value of this system, make the received signal optimization, to obtain good signal quality and enough signal strength signal intensities simultaneously.
Brief Description Of Drawings
Below in conjunction with accompanying drawing,, will make technical scheme of the present invention and other beneficial effects apparent by detailed description to preferred embodiment of the present invention.
In the accompanying drawing,
Fig. 1 is the structure chart of existing wireless communications system;
Fig. 2 is the structure chart of gain control system of the present invention;
Fig. 3 is the schematic diagram of a specific embodiment of coupling apparatus among the present invention;
Fig. 4 is the flow chart of gain control method of the present invention.
Embodiment
Hereinafter, will describe the present invention in detail.
Wireless communication signal is made up of frame (Frame) one by one, frame and interframe have the time interval, for example: short space (the Short Inter-Frame Space of interframe, SIFS), do not carry the signal of data in this time interval, therefore the signal that is received during this period of time is exactly so-called background noise (Background Noise).The objective of the invention is to detect the short space of interframe of wireless communication signal, and obtain entrained communication environment background noise in the short space of this interframe, receiving element is controlled in noise under a certain size simultaneously, when adjusting yield value to keep signal quality.
See also Fig. 2, this is a structure chart of the present invention.Gain control system 5 of the present invention comprises at least: a wireless signal receiving system 51, a signal sampling device 52, a noise samples device 53 and a coupling apparatus 54, and it is as follows that each installs division:
As shown in the figure, wireless signal receiving system 51 of the present invention is used for receiving an extraneous wireless communication signal 50.For intensity and two information of quality that obtain wireless communication signal 50, so wireless communication signal 50 is sent to signal sampling device 52 and noise samples device 53 respectively, to obtain signal strength signal intensity (Signal Strength) respectively and to obtain noise (Noise) information 530.
In one embodiment, noise samples device 53 also includes a checkout gear 531 and one first processing unit 532 detects the short space of interframe in order to assistance, accurately to obtain noise information.Wherein checkout gear 531 is used for detecting the time interval (TimeInterval) between continuous two frames (Frame) in this received signal 510, and produces a detection information 5310; The time interval can a corresponding interframe be lacked space (Short Inter-Frame Space on sequential (Timing); What SIFS), that is to say detection information 5310 representative is the position of SIFS on sequential of wireless communication signal 50.The frame kind that checkout gear 531 is detected can include one and require to transmit (request to send, RTS) frame, an approval transmit (clear to send, CTS) (acknowledgement, ACK) frame, data (data) frame, a beacon (beacon) frame, assign (poll) frame, the additional appointment of data (data plus poll) frame, data to add affirmation (data plus ACK) frame, add appointment (data plus ACK plus poll) frame etc. again with the additional affirmation of data for frame, an affirmation.
532 of first processing unit are coupled to this checkout gear 531, according to this detection information 5310, produce noise samples instruction 5320, make this noise samples device 53 obtain this noise information 530 in wireless communication signal 50.In one embodiment, first processing unit 532 connects transmitter unit (not showing on the figure), state according to this transmitter unit decides noise samples instruction 5320, for example, when transmitter unit is the state of emission data, first processing unit 532 promptly suppresses this noise samples instruction 5320 that (inhibit) produced, and this noise samples device 53 is deenergized (disable), just sampling noise information not during the emission data.First processing unit 532 also can not produce the mode of this noise samples instruction 5320 in addition, and noise samples device 53 is deenergized.In another example, noise samples instruction 5320 can be a Noise gate (NoiseGate), just a kind of digital controlled signal, and when this digital controlled signal is that the logical zero interval scale is not taken a sample, noise samples device 53 is controlled in logical one representative sampling.
The present invention also comprises a coupling apparatus 54, be coupled to this wireless signal receiving system 51, this signal sampling device 52 and this noise samples device 53, signal strength information 520 and noise information 530 suitably computings of warp with gained, produce a back coupling control signal 540, and will feedback control signal 540 and be sent to wireless signal receiving system 51 to change a yield value of above-mentioned wireless signal receiving system 51, at this, the present invention does not singly consider the intensity of wireless communication signal 50, also consider the proportion that noise accounts for wireless communication signal 50, also be whether noise jamming is serious, yield value is adjusted to suitable size, make the received signal optimization, promote signal quality.
See also Fig. 3, this is a specific embodiment of coupling apparatus 54.In the present embodiment, earlier this signal strength information 520 is subtracted each other with different first threshold value (Threshold) and second threshold values that preset respectively with this noise information 530, the result presets first transfer function and second transfer function multiplies each other with different respectively again, get a signal intensity function 61 and the accurate bit function 62 of a noise, produce following four operation values again: the 1) value of this signal intensity function, 2) value of the accurate bit function of this noise, 3) this signal intensity function and the accurate bit function of this noise adds total value, 4) higher value of this signal intensity function and the accurate bit function of this noise.Coupling apparatus 54 can be according to an algorithm of setting in advance, and certain that optionally export in four parameters is this back coupling control signal 540, and as closing the noise gain controlled function, stabilization signal intensity then selects 1); As want the shutdown signal gain control function, keep the accurate position of steady noise and then select 2); As will no matter there being no signal all to have the gain control function of signal and noise concurrently, two kinds of controls are kept in balance then select 3); As will then selecting 4 with the noise dominant gain controlling during no signal) with the leading gain controlling of signal when signal is arranged.
In addition, consult Fig. 2, gain control system 5 of the present invention also includes one second processing unit 55, be coupled to signal sampling device 52 and noise samples device 53, utilize signal strength information 520 and noise information 530 to produce a signal quality information 550, so as to the receptivity of assessment wireless signal receiving system 51.In one embodiment, this signal quality information 550 can make signal strength information 520 and noise information 530 be divided by, or subtracts each other after taking the logarithm, and obtains a signal noise ratio (Signal-to-Noise Ratio; SNR).
See also Fig. 4, this is the flow chart of gain control method of the present invention, includes following steps:
Step 71: receive a wireless communication signal;
Step 72: this wireless communication signal is obtained a signal strength information and a noise information certainly; And
Step 73: according to this signal strength information and this noise information to change a gain parameter.
In step 72, noise information is to be obtained from the time interval between continuous two frames (Frame) in the wireless communication signal, as: short space (the Short Inter-Frame Space of interframe; SIFS).
Lay special stress on, obtaining alternately of signal strength information and noise information rotated, and the branch of out-of-order, that is to say, and which obtains does not earlier have substantial influence to the control of gain.Preset threshold and preset transfer function and then influence gain controlling responsive or blunt in reaction respectively, light or heavy, slow or anxious with in the reaction.In one embodiment, noise information applies to gain controlling, compares with signal strength information, and its threshold preset value is relatively low; Transfer function magnification ratio preset value is relatively large; Transfer function time constant preset value is longer relatively.
In addition, the inventive method comprises that also one selects step 74, can utilize the signal strength information and this noise information that are produced in the above-mentioned flow process to produce a signal quality information, as signal noise ratio (Signal-to-Noise Ratio; SNR).This signal quality information can be used in the assessment of adjusting as above-mentioned yield value, or adjusts emitted energy to change signal quality according to these information requirements transmit leg.
In sum, the invention provides a kind of gain control system and method, utilize the frame of a wireless communication signal and the time interval of interframe, obtain the noise information of background noise, add the strength information of wireless communication signal, output one back coupling control signal is to change a yield value, make the received signal optimization, promote signal quality.In addition, also can utilize noise information and strength information to produce a signal quality information as signal noise ratio (Signal-to-Noise Ratio; SNR), can be for the system reference utilization.
Be understandable that; for the person of ordinary skill of the art; can make other various corresponding changes and distortion according to technical scheme of the present invention and technical conceive, and all these changes and distortion all should belong to the protection range of accompanying Claim of the present invention.
Claims (11)
1, a kind of gain control method that is applied to wireless telecommunication system is characterized in that, comprises following steps at least:
Receive a wireless communication signal;
Obtain a signal strength information from this wireless communication signal;
A time interval of continuous two interframe is obtained a noise information in this wireless communication signal;
According to the computing of this signal strength information and this noise information, produce a back coupling control signal; And
According to this back coupling control signal, adjust a yield value.
2, gain control method according to claim 1 is characterized in that, this time interval is the short space of an interframe.
3, gain control method according to claim 1 is characterized in that, also comprises step: utilize this signal strength information and this noise information to produce the signal quality information of a signal noise ratio.
4, a kind of gain control system that is applied to wireless telecommunication system is characterized in that, comprises at least:
One wireless signal receiving system is in order to receive a wireless communication signal;
One signal sampling device is coupled to this wireless signal receiving system, in order to obtain a signal strength information in this wireless communication signal certainly;
One noise samples device is coupled to this wireless signal receiving system, obtains a noise information in order to a time interval of continuous two interframe in this wireless communication signal certainly; And
One coupling apparatus, be coupled to this wireless signal receiving system, this signal sampling device and this noise samples device, feedback control signal in order to produce one according to this signal strength information and this noise information, and will feedback control signal and be sent to this wireless signal receiving system to adjust a yield value of this wireless signal receiving system.
5, gain control system according to claim 4 is characterized in that, this noise samples device comprises at least:
One checkout gear in order to detecting this time interval, and produces a detection information; And
One first processing unit is coupled to this checkout gear, in order to according to this detection information, produces noise samples instruction, to obtain this noise information.
6, gain control system according to claim 4 is characterized in that, the short space of this time interval corresponding interframe on sequential.
7, gain control system according to claim 5, it is characterized in that, if this wireless signal receiving system is when being in a preparation and stopping an accepting state or a non-accepting state, and this noise samples instruction that this first processing unit promptly suppresses to be produced is deenergized this noise samples device.
8, gain control system according to claim 5, it is characterized in that, if this wireless signal receiving system is when being in a preparation and stopping an accepting state or a non-accepting state, and this first processing unit does not promptly produce this noise samples instruction, and this noise samples device is deenergized.
9, gain control system according to claim 5, it is characterized in that this first processing unit connects an emitter, when this emitter is in an emission state, this noise samples instruction that this first processing unit promptly suppresses to be produced is deenergized this noise samples device.
10, gain control system according to claim 5, it is characterized in that this first processing unit connects an emitter, when this emitter is in an emission state, this first processing unit does not promptly produce this noise samples instruction, and this noise samples device is deenergized.
11, gain control system according to claim 4, it is characterized in that, also comprise: one second processing unit, be coupled to this signal sampling device and this noise samples device, produce a signal quality information in order to utilize this signal strength information and this noise information.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB031551491A CN100364240C (en) | 2003-08-20 | 2003-08-20 | Gain control method and system for wireless communication system |
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| CNB031551491A CN100364240C (en) | 2003-08-20 | 2003-08-20 | Gain control method and system for wireless communication system |
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| CN1585285A true CN1585285A (en) | 2005-02-23 |
| CN100364240C CN100364240C (en) | 2008-01-23 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102711232A (en) * | 2012-06-12 | 2012-10-03 | 广州杰赛科技股份有限公司 | Full duplex wireless communication method, base station, mobile station and system |
| CN108882351A (en) * | 2017-05-15 | 2018-11-23 | 瑞昱半导体股份有限公司 | The gain adjusting method of wireless communication |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1196367C (en) * | 1998-02-27 | 2005-04-06 | 西门子公司 | Relaying in a telecommunications system based on code and time-division multiplex |
| US6310866B1 (en) * | 1998-10-09 | 2001-10-30 | Telefonaktiebolaget Lm Ericsson (Publ) | Medium access control protocol with automatic frequency assignment |
| KR100595839B1 (en) * | 1999-10-04 | 2006-07-05 | 에스케이 텔레콤주식회사 | Apparatus and method for compensating rf module gain using measured rf module noise |
| US6977915B2 (en) * | 2001-01-30 | 2005-12-20 | Nortel Networks Limited | Method and system for controlling device transmit power in a wireless communication network |
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2003
- 2003-08-20 CN CNB031551491A patent/CN100364240C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102711232A (en) * | 2012-06-12 | 2012-10-03 | 广州杰赛科技股份有限公司 | Full duplex wireless communication method, base station, mobile station and system |
| CN102711232B (en) * | 2012-06-12 | 2015-07-01 | 广州杰赛科技股份有限公司 | Full duplex wireless communication method, base station, mobile station and system |
| CN108882351A (en) * | 2017-05-15 | 2018-11-23 | 瑞昱半导体股份有限公司 | The gain adjusting method of wireless communication |
| CN108882351B (en) * | 2017-05-15 | 2021-09-14 | 瑞昱半导体股份有限公司 | Gain adjustment method for wireless communication |
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| CN100364240C (en) | 2008-01-23 |
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