CN104124986A - Wireless signal receiver and signal processing method thereof - Google Patents
Wireless signal receiver and signal processing method thereof Download PDFInfo
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- CN104124986A CN104124986A CN201310145037.9A CN201310145037A CN104124986A CN 104124986 A CN104124986 A CN 104124986A CN 201310145037 A CN201310145037 A CN 201310145037A CN 104124986 A CN104124986 A CN 104124986A
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Abstract
The invention provides a wireless signal receiver and a signal processing method thereof. The wireless signal receiver consists of a receiving module, an automatic gain control module, a measurement module, a decoding module and a control module. The receiving module is used for receiving a wireless signal; the automatic gain control module is used for adjusting the amplitude of the wireless signal according to a gain value to generate a signal after adjustment; the measurement module is used for measuring the signal strength of the signal after adjustment; and the decoding module is used for decoding the signal after adjustment. When the decoding module determines that the signal after adjustment corresponds to a beacon packet sent from a transmitting terminal, the control module adjusts the gain value based on the signal strength.
Description
Technical field
The present invention is relevant to wireless telecommunication system, and especially with wireless signal receiver in automatic gain to control (automatic gain control, AGC) technology relevant.
Background technology
The receiving terminal of WLAN (wireless local area network, WLAN) system must have the ability that receives the signal that multiple intensity is different.In practice, the signal intensity difference that receiving terminal is faced may be up to 90dB.The amplitude that (AGC) circuit is responsible for adjusting input signal is controlled at the automatic gain of receiving terminal front end in position, and the amplitude of adjusting rear signal is dropped in the dynamic range of follow-up analog digital-transducer.If automatic gain control circuit running is improper, provide to the signal amplitude of analog digital-transducer may be excessive and cause analog digital-transducer saturated, also may be too small and cause signal noise ratio too low, and then affect the correctness of decoded result.
In existing technology, receiving terminal stores a fixing initial yield value.Starting to carry out before package searching procedure, the yield value of automatic gain control circuit is reset as this initial yield value at every turn.Automatic gain control circuit can, from this initial yield value, dynamically be adjusted its yield value according to the amplitude of input signal subsequently.Will be understood that, if be suitable for, receive package yield value and this initial yield value difference above larger, just automatic gain control circuit needs the more time to begin to find out suitable yield value conventionally.
Most automatic gain control circuits must be found out suitable yield value within certain time limit.The 802.11a/g/n communication specification of take is example, and this time limit length is eight microseconds (μ s), that is the short length of (short preamble) above of package.Generally speaking, the distance between transmission end and receiving terminal is far away, the intensity of the signal that receiving terminal is received more a little less than.In fact, for example, distance between receiving terminal (notebook computer or smart mobile phone) and transmission end may not be definite value.In different occasions, provide the transmission end of communication link also different.Fixing initial yield value obviously can not be applicable to various wireless signal strengths.If the gap of initial yield value and target gain value is too large, cause automatic gain control circuit cannot find out in time suitable yield value, for example, just receiving terminal is likely omitted the package that transmission end (radio access device) provides.In this situation, receiving terminal can require transmission end again to send the package that content is identical, causes the overall transfer decrease in efficiency of system.
Summary of the invention
For addressing the above problem, the present invention proposes a kind of automatic gain control circuit, a kind of wireless signal receiver that comprises automatic gain control circuit, with and signal processing method.According to automatic gain control circuit of the present invention, receiver and signal processing method, utilize the beacon package (beacon packet) that send transmission end to determine a gain initial value, for automatic gain control circuit.This way contributes to shorten automatic gain control module and for the package of same radio access device transmission, finds the needed time of suitable yield value subsequently.Concept of the present invention can be widely used in the various wireless telecommunication systems that send beacon package or similar reference signal that have, and to meet the wireless telecommunication system of 802.11n communications protocol, is not limited.
A specific embodiment according to the present invention is a kind of wireless signal receiver, wherein comprises a receiver module, an automatic gain control module, a measurement module, a decoder module and a control module.This receiver module is in order to connect a wireless signal.This automatic gain control module is in order to adjust an amplitude of this wireless signal according to a yield value, to produce signal after an adjustment.This measurement module is in order to measure a signal strength signal intensity of the rear signal of this adjustment.This decoder module is in order to the rear signal of this adjustment of decoding.When this decoder module judge signal after this adjustment be corresponding to from a transmission end, send a beacon package time, this control module is adjusted this yield value according to this signal strength signal intensity.
The automatic gain control circuit that another specific embodiment according to the present invention is a kind of dynamic adjustment yield value, in order to adjust an amplitude of a wireless signal of a wireless signal receiver reception.This automatic gain control circuit comprises an automatic gain control module, a measurement module, a decoder module and a control module.This automatic gain control module is in order to adjust an amplitude of this wireless signal according to a yield value, to produce signal after an adjustment.This measurement module is in order to measure a signal strength signal intensity of the rear signal of this adjustment.This decoder module is in order to the rear signal of this adjustment of decoding.When this decoder module judge signal after this adjustment be corresponding to from a transmission end, send a beacon package time, this control module is adjusted this yield value according to this signal strength signal intensity.
Another specific embodiment according to the present invention is a kind of signal processing method that is applied to wireless signal receiver.This wireless signal receiver comprises an automatic gain control module.First the method carries out a receiving step: receive a wireless signal.Then, the method is carried out a set-up procedure: make this automatic gain control module according to a yield value, adjust an amplitude of this wireless signal, to produce signal after an adjustment.Subsequently, the method is carried out a measuring process: a signal strength signal intensity of measuring the rear signal of this adjustment.Then it is decoded that, this adjusts rear signal.After this adjustment, signal is judged as corresponding to the beacon package sending from a transmission end, and the method is carried out a set-up procedure: according to this signal strength signal intensity, adjust this yield value.
Accompanying drawing explanation
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, below in conjunction with accompanying drawing, the specific embodiment of the present invention is elaborated, wherein:
Fig. 1 is according to the functional block diagram of the wireless signal receiver in one embodiment of the invention.
Fig. 2 is according to the flow chart of the signal processing method in one embodiment of the invention.
Element numbers explanation in figure:
100: wireless signal receiver
11: receiver module
12: automatic gain control module
13: measurement module
14: decoder module
15: control module
S21～S26: process step
Embodiment
A specific embodiment according to the present invention is a kind of wireless signal receiver, and its functional block diagram as shown in Figure 1.Wireless signal receiver 100 comprises a receiver module 11, an automatic gain control module 12, a measurement module 13, a decoder module 14 and a control module 15.In practical application, it is inner that wireless signal receiver 100 can be incorporated into various electronic installations, and for example desktop computer, notebook computer, smart mobile phone, also can independently exist.
According to 802.11n communications protocol, one wireless access point must periodically send beacon package (beacon packet) with the forms of broadcasting, and in this package, carry its service setting identification code (service set identifier, SSID), medium access is controlled (media access control, MAC) information such as transmission rate of address, support, connect the receiving terminal reference of this wireless access point for wish.Wireless signal receiver 100 take the signal strength signal intensity of beacon package is foundation, determines the initial yield value of automatic gain control module 12.See through following explanation, persons of ordinary skill in the technical field of the present invention can understand, the concept that the present invention proposes also can be applicable to the various wireless telecommunication systems that send beacon package or similar reference signal that have, and its application category is not limited to meet the wireless telecommunication system of 802.11n communications protocol.
Receiver module 11 is to receive a wireless signal, and this wireless signal is provided to automatic gain control module 12.In practice, receiver module 11 can be including but not limited to antenna.In wireless signal receiver 100, store a default yield value G
default.Automatic gain control module 12 is to preset yield value G
defaultadjust the amplitude of this wireless signal, to produce signal after an adjustment.After this adjustment, signal is passed to respectively measurement module 13 and decoder module 14.Measurement module 13 is responsible for measuring the intensity that this adjusts rear signal.14 of decoder modules are in order to by signal decoding after this adjustment.Should be noted that, the implementation detail of measure signal intensity and decoding is known to persons of ordinary skill in the technical field of the present invention, in this, repeats no more.
In an embodiment, measurement module 13 is to measure the mean intensity of the rear signal of this adjustment in a preset period of time, as this signal strength signal intensity.For example, measurement module 13 can utilize lower column index rolling average (exponential moving average) equation to calculate this mean intensity:
E{RSSI[n]}=Coeff_avg*RSSI[n]+(1-Coeff_avg)*E{RSSI[n-1]}，
RSSI[n wherein] represent a up-to-date signal strength signal intensity sampling value, E{RSSI[n-1] representative do not comprise this fresh signal intensity sampling value and the mean intensity that calculates, E{RSSI[n] representative comprises the mean intensity calculating after this fresh signal intensity sampling value.Coeff_avg is a mean parameter, and its size is not limited with special value.
If decoder module 14 can be correctly decoded signal after this adjustment, and judge after this adjustment that signal system is corresponding to the one or more beacon packages that send from a transmission end, the signal strength signal intensity E{RSSI[n that control module 15 produces according to measurement module 13] } determine an initial yield value G
initial, for automatic gain control module 12.More particularly, when automatic gain control module 12 receives new wireless signal subsequently, be from initial yield value G
initialstart, according to the amplitude of input signal, dynamically adjust its yield value.In an embodiment, control module 15 is to calculate initial yield value G according to following equation
initial:
G
initial[n]=RSSI_to_G
initial(E{RSSI[n]})+offset，
RSSI_to_G wherein
initialtransformational relation function between () representation signal intensity and yield value, parameter offset represents a corrected value.
Unless wireless signal receiver 100 is the state in fast moving, the signal intensity difference of the various packages that receive from same radio access device is not too large.Therefore, according to initial yield value G
initial[n] replacement automatic gain control module 12 contributes to shorten automatic gain control module 12 and for the package of same radio access device transmission, finds the needed time of suitable yield value subsequently.Whereby, wireless signal receiver 100 is crossed the slow probability of omitting package because of automatic gain control module 12 running speed and can significantly be reduced, and then is promoted the overall transfer efficiency of radio area network receiver 100 residing wireless systems.
In an embodiment, according to initial yield value G
initialafter [n] replacement automatic gain control module 12, if decoder module 14 does not solve any package in a default reset stage, just control module 15 resets to automatic gain control module 12 to adopt default yield value G
defaultas this initial yield value, make wireless signal receiver 100 restart to find new beacon package and corresponding new initial yield value.
In an embodiment, control module 15 is periodically according to a fresh signal intensity, to change the initial yield value that automatic gain control module 12 adopts.More particularly, measurement module 13 can be designed to continue to supervise the intensity of beacon package, and control module can optionally be adjusted the initial yield value that automatic gain control module 12 adopts accordingly, to immediately also dynamically finding out more suitable initial yield value.
The automatic gain control circuit that another specific embodiment according to the present invention is a kind of dynamic adjustment yield value, in order to adjust an amplitude of a wireless signal of a wireless signal receiver reception.This automatic gain control circuit comprises the automatic gain control module 12 shown in Fig. 1, measurement module 13, decoder module 14 and control module 15.This automatic gain control circuit can be incorporated in various wireless receivers, also can independently exist; Its function mode can, referring to previous embodiment, repeat no more.
Another specific embodiment according to the present invention is a kind of signal processing method that is applied to wireless signal receiver, and its flowchart is illustrated in Fig. 2.First the method performs step S21: receive a wireless signal.Then, the method execution step S22: make this automatic gain control module adjust an amplitude of this wireless signal according to a yield value, to produce signal after an adjustment.Subsequently, the method execution step S23 a: signal strength signal intensity of measuring the rear signal of this adjustment.It is also decoded in step S24 that this adjusts rear signal.Step S25 is for whether signal after judging this decoding is corresponding to the one or more beacon packages that send from a transmission end.If judgment result is that of step S25 is that the method performs step S26: the signal strength signal intensity producing according to step S23 is adjusted this yield value.Relatively, if the determination result is NO for step S25, this flow process comes back to step S21.
In practice, step S21～S26 can periodically be repeated.In addition, the various circuit operations of previously having described when introducing wireless signal receiver 100 change and also can be applied in the signal processing method that Fig. 2 illustrates, and its details repeats no more.
As mentioned above, the present invention proposes a kind of automatic gain control circuit, a kind of wireless signal receiver that comprises automatic gain control circuit, with and signal processing method.According to automatic gain control circuit of the present invention, receiver and signal processing method, utilize the beacon package that send transmission end to determine a gain initial value, for automatic gain control circuit.This way contributes to shorten automatic gain control module and for the package of same radio access device transmission, finds the needed time of suitable yield value subsequently.Concept of the present invention can be widely used in the various wireless telecommunication systems that send beacon package or similar reference signal that have, and to meet the wireless telecommunication system of 802.11n communications protocol, is not limited.
By the above detailed description of preferred embodiments, be to wish more to know to describe feature of the present invention and spirit, and not with above-mentioned disclosed preferred embodiment, scope of the present invention limited.On the contrary, its objective is that hope can contain in the scope of claims of being arranged in of various changes and tool equality institute of the present invention wish application.
Claims (15)
1. dynamically adjust the automatic gain of yield value and control (AGC) circuit, in order to adjust an amplitude of a wireless signal of a wireless signal receiver reception, comprise:
One automatic gain control module, in order to adjust this amplitude of this wireless signal according to a yield value, to produce signal after an adjustment;
One measurement module, in order to measure a signal strength signal intensity of the rear signal of this adjustment;
One decoder module, in order to signal after this adjustment of decoding; And
One control module, when this decoder module judge signal after this adjustment be corresponding to from a transmission end, send a beacon package time, this control module is adjusted this yield value according to this signal strength signal intensity.
2. automatic gain control circuit as claimed in claim 1, is characterized in that, this measurement module is measured the mean intensity of the rear signal of this adjustment in a preset period of time, as this signal strength signal intensity.
3. automatic gain control circuit as claimed in claim 2, is characterized in that, this measurement module utilizes an index rolling average program to calculate this mean intensity.
4. automatic gain control circuit as claimed in claim 1, is characterized in that, this transmission end is periodically to send this beacon package, and this control module is periodically according to this signal strength signal intensity, to adjust this yield value.
5. automatic gain control circuit as claimed in claim 4, is characterized in that, if this decoder module does not solve any package in a default reset stage, this control module resets to a default yield value by this yield value.
6. a wireless signal receiver, comprises:
One receiver module, in order to receive a wireless signal;
One automatic gain control module, in order to adjust an amplitude of this wireless signal according to a yield value, to produce signal after an adjustment;
One measurement module, in order to measure a signal strength signal intensity of the rear signal of this adjustment;
One decoder module, in order to signal after this adjustment of decoding; And
One control module, when this decoder module judge signal after this adjustment be corresponding to from a transmission end, send a beacon package time, this control module is adjusted this yield value according to this signal strength signal intensity.
7. wireless signal receiver as claimed in claim 6, is characterized in that, this measurement module is measured the mean intensity of the rear signal of this adjustment in a preset period of time, as this signal strength signal intensity.
8. wireless signal receiver as claimed in claim 7, is characterized in that, this measurement module utilizes an index rolling average program to calculate this mean intensity.
9. wireless signal receiver as claimed in claim 1, is characterized in that, this transmission end is periodically to send this beacon package, and this control module is periodically according to this signal strength signal intensity, to adjust this yield value.
10. wireless signal receiver as claimed in claim 9, is characterized in that, if this decoder module does not solve any package in a default reset stage, this control module resets to a default yield value by this yield value.
11. 1 kinds of signal processing methods that are applied to a wireless signal receiver, this wireless signal receiver comprises an automatic gain control module, and this signal processing method comprises:
(a) receive a wireless signal;
(b) make this automatic gain control module according to a yield value, adjust an amplitude of this wireless signal, to produce signal after an adjustment;
(c) measure a signal strength signal intensity of the rear signal of this adjustment;
(d) signal after this adjustment of decoding, to produce signal after a decoding; And
(e) after this decoding signal be judged as corresponding to from a transmission end, send a beacon package time, according to this signal strength signal intensity, adjust this yield value.
12. signal processing methods as claimed in claim 11, is characterized in that, step (c) comprises measures the mean intensity of the rear signal of this adjustment in a preset period of time, as this signal strength signal intensity.
13. signal processing methods as claimed in claim 12, is characterized in that, step (c) comprises utilizes an index rolling average program to calculate this mean intensity.
14. signal processing methods as claimed in claim 11, further comprise:
Periodically according to this signal strength signal intensity, adjust this yield value.
15. signal processing methods as claimed in claim 14, further comprise:
If this wireless signal receiver does not solve any package in a default reset stage, this yield value is reset to a default yield value.
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| CN201310145037.9A CN104124986B (en) | 2013-04-24 | 2013-04-24 | Wireless signal receiver and signal processing method thereof |
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| CN201310145037.9A CN104124986B (en) | 2013-04-24 | 2013-04-24 | Wireless signal receiver and signal processing method thereof |
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| CN104124986B CN104124986B (en) | 2016-12-28 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108512558A (en) * | 2017-02-24 | 2018-09-07 | 瑞昱半导体股份有限公司 | The processing method and wireless device of wireless signal |
| 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 |
| CN110391834A (en) * | 2019-07-22 | 2019-10-29 | 展讯通信（上海）有限公司 | Gain adjusting method, device, trunking and storage medium |
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| CN101107826A (en) * | 2004-09-27 | 2008-01-16 | 娜维尼网络技术公司 | Receiver gain control using a pilot signal |
| CN101447803A (en) * | 2007-11-27 | 2009-06-03 | 北京六合万通微电子技术股份有限公司 | Method for estimating signal intensity of EOC system terminal receiver |
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| CN101107826A (en) * | 2004-09-27 | 2008-01-16 | 娜维尼网络技术公司 | Receiver gain control using a pilot signal |
| CN101447803A (en) * | 2007-11-27 | 2009-06-03 | 北京六合万通微电子技术股份有限公司 | Method for estimating signal intensity of EOC system terminal receiver |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108512558A (en) * | 2017-02-24 | 2018-09-07 | 瑞昱半导体股份有限公司 | The processing method and wireless device of wireless signal |
| 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 |
| CN110391834A (en) * | 2019-07-22 | 2019-10-29 | 展讯通信（上海）有限公司 | Gain adjusting method, device, trunking and storage medium |
| CN110391834B (en) * | 2019-07-22 | 2021-10-29 | 展讯通信（上海）有限公司 | Gain adjustment method, device, relay device and storage medium |
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| CN104124986B (en) | 2016-12-28 |
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