CN102820898B - Gain regulation method and equipment - Google Patents
Gain regulation method and equipment Download PDFInfo
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- CN102820898B CN102820898B CN201210245378.9A CN201210245378A CN102820898B CN 102820898 B CN102820898 B CN 102820898B CN 201210245378 A CN201210245378 A CN 201210245378A CN 102820898 B CN102820898 B CN 102820898B
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Abstract
The embodiment of the invention discloses a gain regulation method and equipment. The method is used for a wireless signal receiver; in the receiver, a wireless signal is successively processed by a radio frequency module, an analog-to-digital converter (ADC), a baseband filter, a first digital gain amplifier and a fast Fourier transform (FFT) module. The method comprises the following steps of: after the receiver and a wireless network are synchronized, obtaining a pre-filtering received signal intensity indication PreRssi of a wireless signal subjected to ADC processing; obtaining an in-band receiving signal intensity indication InBandRssi of the wireless signal subjected to FFT module processing; and according to the power difference of the PreRssi and the InBandRssi, regulating the gain of the radio frequency module and the gain of the first digital gain amplifier; and therefore enabling the power value of the wireless signal before the filtered wireless signal enters the FFT module to achieve a first target power value. According to the embodiment of the invention, the radio frequency signal is prevented from saturating. Meanwhile, useful signal power is amplified to be high enough, and no performance loss is caused.
Description
Technical field
The present invention relates to wireless communication field, especially relate to a kind of gain adjusting method and equipment.
Background technology
When radio communication, the intensity of the wireless signal that wireless receiver receives often can change, and its major influence factors comprises wireless channel decline, load, power control, and distance base station location is far and near etc.Stable receiver needs larger reception dynamic range.In order to reduce the bit wide of numeric field to save cost, need the intensity according to receiving signal, adopt automatic growth control (Automatic GainControl, AGC) mode, the gain of adjustment radio-frequency devices, or the gain of digital baseband, carry out analog or digital territory to signal to regulate, thus overcome above-mentioned reception dynamically, the impact of load etc. aspect, Received signal strength is adjusted to a suitable scope, again by analog to digital converter ADC(Analog to Digital Converter) quantize, thus reduce bit wide, reduce costs.
In a wireless communication system; such as Long Term Evolution (long term evolution; LTE) system; there is very strong unwanted signal interference outward in useful signal bandwidth in frequent meeting, if can not be correct detect this interference and eliminated, signal is adjusted to rational level simultaneously; then can cause the saturation distortion of radio-frequency devices; or available signal power level is inadequate, affects the normal work of receiver, causes throughput degradation.Usually two kinds of methods are had to carry out Gain tuning in prior art:
A kind of method is the broadband RSSI(Receive Signal StrengthIndication by adding up before baseband filter, received signal strength indicator) generate simulation AGC gain, signal power after ADC is adjusted in a fixing desired value, thus as far as possible ensure mixer(frequency mixer), the radio frequency analog device such as ADC is unsaturated, shown in Figure 1.The shortcoming of the program is, if when being with outer interference signal large especially, statistics baseband filter front signal power, and adjust rf gain with this power, although so signal can not occur saturated through radio-frequency devices, the power of useful signal can be very little, may not reach the signal to noise ratio of demodulation requirement, thus cause higher error code, reduce throughput.In addition the power of signal is not constant after device after filtering, different from the ratio of available signal power and change with interference power, has impact for follow-up algorithm.
Another kind method be arrowband RSSI after statistics baseband filter to generate simulation AGC gain, filtered signal is adjusted in a fixing desired value, thus ensures that useful signal can reach maximum desired value, also can be shown in Figure 1.The shortcoming of the program is, if be with outer interference signal large especially, when adding up the signal power after baseband filtering, the mainly power of useful signal, when adjusting rf gain with this power, the signal received due to radio-frequency devices comprises useful signal and interference signal, so total signal power can be very large, cause radio-frequency devices saturated, cause error code, reduce throughput.
Visible when there is interference, prior art cannot by Gain tuning to desirable state, that is, available signal power can be amplified to enough large prior art not only cannot ensure that radiofrequency signal can not occur saturated while.
Summary of the invention
In view of this, the object of the embodiment of the present invention is to provide a kind of gain adjusting method and equipment, available signal power can be amplified to again enough large to make radiofrequency signal while of can not occurring saturated.
Embodiments provide a kind of gain adjusting method, for wireless signal receiver, in the receiver, wireless signal is successively through the process of radio-frequency module, analog to digital converter ADC, baseband filter, the first digital gain amplifier, fast fourier transform FFT module; Described method comprises:
When described receiver and wireless network obtain synchronous after, obtain received signal strength indicator PreRssi before the filtering of the described wireless signal after described ADC process,
Received signal strength indicator InBandRssi in the band of the described wireless signal of acquisition after described FFT resume module,
According to the power difference of described PreRssi and InBandRssi, adjust the gain of described radio-frequency module and the gain of described first digital gain amplifier, reach first object performance number with the performance number entered before described FFT module after making described wireless signal filtering.
Preferred:
The described power difference according to described PreRssi and InBandRssi, adjust the gain of described radio-frequency module and the gain of described first digital gain amplifier, reach first object performance number with the performance number entered before described FFT module after making described wireless signal filtering and comprise:
Adjust the gain of described radio-frequency module according to the power difference of described PreRssi and InBandRssi, reach the second target power value with the performance number before making described wireless signal filtering;
Adjust the gain of described first digital gain amplifier, reach first object performance number with the performance number entered before described FFT module after making described wireless signal filtering.
Preferred:
Described receiver also comprises the second digital gain amplifier, and described wireless signal first enters described baseband filter again after described ADC exports after described second digital gain amplifier process;
According to the power difference of described PreRssi and InBandRssi, adjust the gain of described radio-frequency module and the gain of described first digital gain amplifier, reach first object performance number with the performance number entered before described FFT module after making described wireless signal filtering and comprise:
Adjust the gain of described radio-frequency module according to the power difference of described PreRssi and InBandRssi, reach the 3rd target power value to make the performance number of described wireless signal after described radio-frequency module process;
Adjust the gain of described second digital gain amplifier, reach the second target power value to make the performance number of described wireless signal after described second digital gain amplifier;
Adjust the gain of described first digital gain amplifier, reach first object performance number with the performance number entered before described FFT module after making described wireless signal filtering.
Preferably, described method also comprises:
When described receiver does not obtain synchronous with wireless network, obtain received signal strength indicator PreRssi before the filtering of the described wireless signal after described ADC process,
Received signal strength indicator PostRssi after the filtering of the described wireless signal that acquisition exports from described baseband filter,
According to the power difference of described PreRssi and PostRssi, adjust the gain of described radio-frequency module and the gain of described first digital gain amplifier, reach first object performance number with the performance number entered before described FFT module after making described wireless signal filtering.
The embodiment of the present invention adds a digital gain amplifier after the filter, to obtain before filtering received signal strength indicator InBandRssi in received signal strength indicator PreRssi and band more respectively, so can Interference Detection out and get the intensity of interference when there is interference, then go according to interference and the difference of available signal power the gain adjusting rf gain and digital gain amplifier in various degree conversely again, thus it is saturated to ensure that radiofrequency signal can not occur, available signal power can be amplified to again enough large simultaneously, not cause performance loss.In addition, filtered signal power can also be made to remain on relatively more fixing scope, decrease the impact that subsequent module is caused because signal power fluctuates.
The embodiment of the present invention additionally provides a kind of wireless signal receiver, comprising: radio-frequency module, analog to digital converter ADC, baseband filter, the first digital gain amplifier, fast fourier transform FFT module and gain regulator; Wireless signal in described wireless signal receiver successively through the process of described radio-frequency module, analog to digital converter ADC, baseband filter, the first digital gain amplifier, fast fourier transform FFT module;
Described gain regulator comprises:
PreRssi acquisition module, for obtain when described receiver and wireless network synchronous after, obtain received signal strength indicator PreRssi before the filtering of the described wireless signal after described ADC process,
InBandRssi acquisition module, for obtain when described receiver and wireless network synchronous after, received signal strength indicator InBandRssi in the band obtaining the described wireless signal after described FFT resume module,
Adjusting module, for the power difference according to described PreRssi and InBandRssi, adjust the gain of described radio-frequency module and the gain of described first digital gain amplifier, reach first object performance number with the performance number entered before described FFT module after making described wireless signal filtering.
Preferably, described adjusting module specifically for:
Adjust the gain of described radio-frequency module according to the power difference of described PreRssi and InBandRssi, reach the second target power value with the performance number before making described wireless signal filtering;
Adjust the gain of described first digital gain amplifier, reach first object performance number with the performance number entered before described FFT module after making described wireless signal filtering.
Preferably, described receiver also comprises the second digital gain amplifier, and described wireless signal first enters described baseband filter again after described ADC exports after described second digital gain amplifier process; Described adjusting module specifically for:
Adjust the gain of described radio-frequency module according to the power difference of described PreRssi and InBandRssi, reach the 3rd target power value to make the performance number of described wireless signal after described radio-frequency module process;
Adjust the gain of described second digital gain amplifier, reach the second target power value to make the performance number of described wireless signal after described second digital gain amplifier;
Adjust the gain of described first digital gain amplifier, reach first object performance number with the performance number entered before described FFT module after making described wireless signal filtering.
Preferably, described gain regulator also comprises:
PostRssi acquisition module, for when described receiver does not obtain synchronous with wireless network, obtains received signal strength indicator PostRssi after the filtering of the described wireless signal exported from described baseband filter;
Described PreRssi acquisition module, also for when described receiver does not obtain synchronous with wireless network, obtains received signal strength indicator PreRssi before the filtering of the described wireless signal after described ADC process,
Described adjusting module, also for the power difference according to described PreRssi and PostRssi, adjust the gain of described radio-frequency module and the gain of described first digital gain amplifier, reach first object performance number with the performance number entered before described FFT module after making described wireless signal filtering.
Preferably, described adjusting module is the processor realized by logical integrated circuit, and described receiver also comprises: memory, and for storing software program command, described adjusting module is by running described software program instructions work.
Preferably, the power difference of described PreRssi and InBandRssi reflects the intensity that the band of described wireless signal disturbs outward.
The present embodiment not only adds a digital gain amplifier after the filter, before filter, also add a digital gain amplifier, received signal strength indicator InBandRssi in received signal strength indicator PreRssi and band is obtained before filtering respectively by the method for the present embodiment, can Interference Detection out and get the intensity of interference when there is interference, then go according to interference and the difference of available signal power the gain adjusting rf gain and two digital gain amplifier in various degree conversely again, thus it is saturated to ensure that radiofrequency signal can not occur, available signal power can be amplified to again enough large simultaneously, do not cause performance loss.In addition, filtered signal power can also be made to remain on relatively more fixing scope, decrease the impact that subsequent module is caused because signal power fluctuates.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is circuit diagram in prior art;
Fig. 2 is the flow chart of one embodiment of the invention method;
Fig. 3 is the circuit diagram of wireless signal receiver in one embodiment of the invention;
Fig. 4 is the flow chart of another embodiment of the present invention method;
Fig. 5 is the circuit diagram of wireless signal receiver in another embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
See Fig. 2, it is the flow chart of one embodiment of the invention method.Described method is used for wireless signal receiver, and in the receiver, wireless signal is successively through the process of radio-frequency module, analog to digital converter ADC, baseband filter, the first digital gain amplifier, fast fourier transform FFT module.Described method comprises: when described receiver and wireless network obtain synchronous after,
S201: obtain received signal strength indicator PreRssi before the filtering of the described wireless signal after described ADC process.
S202: received signal strength indicator InBandRssi in the band obtaining the described wireless signal after described FFT resume module.InBandRssi statistics after FFT be the power of useful signal.
S203: according to the power difference of described PreRssi and InBandRssi, adjust the gain of described radio-frequency module and the gain of described first digital gain amplifier, reach first object performance number with the performance number entered before described FFT module after making described wireless signal filtering.Wherein, the power difference of described PreRssi and InBandRssi reflects the intensity that the band of described wireless signal disturbs outward.
The circuit diagram of the present embodiment can be shown in Figure 3.In the receiver, described wireless signal is successively through the process of radio-frequency module 301, analog to digital converter ADC302, baseband filter 303, first digital gain amplifier 305, fast fourier transform FFT module 304.In figure 3, specifically perform above-mentioned steps by gain regulator 307, comprise and gather PreRssi and InBandRssi data respectively, and send Gain tuning order respectively to radio-frequency module and the first digital gain amplifier.
The general principle of the present embodiment is: the wireless signal in LTE system is passed through radio frequency processing, down-convert to baseband signal, through analog to digital converter (Analog to Digital Converter, ADC), become digital signal, and received signal strength indicator PreRssi before statistical filtering.Then signal through baseband filter process, remove band outside interference.Wherein said baseband filter can be FIR(Finite ImpulseResponse, finite impulse response).Signal after removing interference is amplified through the first digital gain amplifier, give fast Fourier transform (Fast Fourier Transform again, FFT) resume module, and to the statistics of signal with interior received signal strength indicator InBandRssi through conversion, PreRssi and InBandRssi is used to differentiate whether there is obstruction, and the degree of blocking, finally produce two control signals according to these results, control the gain of radio-frequency module and the gain of the first digital gain amplifier respectively, make Received signal strength be in suitable level.
In the present embodiment, preferably, step S203 specifically can comprise the following steps:
S2031: the gain adjusting described radio-frequency module according to the power difference of described PreRssi and described InBandRssi, reaches the second target power value with the performance number before making described wireless signal filtering;
S2032: the gain adjusting described first digital gain amplifier, reaches first object performance number with the performance number entered before described FFT module after making described wireless signal filtering.
Below in conjunction with concrete numerical value, the present embodiment is further detailed:
First generally, the present embodiment is utilize the intensity of several threshold values to interference to divide when implementing, according to the difference of interference strength, wireless signal adjusted to power target value i.e. the second target power value before different filtering by adjustment rf gain, signal power adjusted to power target value, i.e. first object performance number after unified filtering by the gain of adjustment first digital gain amplifier again after filtering.
When interference strength is less than thresholding 0, such as thresholding 0 is 6dB, then adjust the gain of rf gain and the first digital gain amplifier according to method when not disturbing, and all adjusts to first object performance number, such as, adjust to 40dB before making filtering with filtered signal.Before acquisition is synchronous, use PreRssi, after acquisition is synchronous, use InBandRssi, calculate the intensity of antenna opening signal, between antenna opening signal strength signal intensity and rf gain, there is form one to one, different antenna opening signal strength signal intensities uses different rf gains, thus can make the antenna opening signal of unlike signal intensity after rf gain amplifies, obtain onesize first object performance number, i.e. 40dB.
When interference strength is greater than thresholding 0, is less than thresholding 1, such as thresholding 1 is 12dB, then adjust rf gain according to the PreRssi before filtering, makes signal adjust to desired value 1, i.e. the second target power value 1 before filtering, as 46dB.Before filtering, desired value 1 and thresholding 1 have relation.Adjusting rf gain according to the PreRssi before filtering specifically to be undertaken by tabling look-up, by PreRssi, deducting a constant, deduct the gain that current radio frequency is used again, antenna opening power can be obtained, according to antenna opening power, look into an AGC table, just can determine rf gain.And PreRssi can pass through sum (I
2+ Q
2)/2N calculates acquisition, wherein I
2for the signal on receiving path I road square, Q
2for the signal on receiving path Q road square, sum (I
2+ Q
2) representing the cumulative of signal power in a period of time, such as a symbol or a subframe, N is accumulative frequency.Then according to the comparison of PreRssi and InBandRssi, poor with filtered signal power before obtaining filtering, adjust the gain of the first digital gain amplifier, such as, signal power before filtering and filtered signal power difference 10dB, namely filtered signal power is 46dB-10dB=36dB, then the gain arranging the first digital gain amplifier is 4dB, thus target power value after the signal before entering FFT being adjusted to filtering, namely first object performance number is adjusted to, 36dB+4dB=40dB.The signal power that InBandRssi obtains before depending on filtering, and the rejection ability of filter, InBandRssi specifically can pass through sum ' (A
2+ B
2)/2N obtains, wherein A
2be the A road signal of a subcarrier square, B
2be the B road signal of a subcarrier square, sum ' (A
2+ B
2) represent subcarrier in a frequency range signal power and, in a such as symbol, or in a subframe, N is accumulative frequency.
When interference strength is greater than thresholding 1, is less than thresholding 2, such as thresholding 2 is 18dB, then adjust rf gain according to the PreRssi before filtering, makes signal adjust to desired value 2, i.e. the second target power value 2 before filtering, as 52dB.Then according to the comparison of PreRssi and InBandRssi, poor with filtered signal power before obtaining filtering, adjust the gain of the first digital gain amplifier, such as, signal power before filtering and filtered signal power difference 16dB, namely filtered signal power is 52dB-16dB=36dB, then the gain arranging the first digital gain amplifier is 4dB, thus target power value after the signal before entering FFT being adjusted to filtering, namely first object performance number is adjusted to, 36dB+4dB=40dB.
When interference strength is greater than thresholding 2, is less than thresholding 3, such as thresholding 3 is 24dB, then adjust rf gain according to the PreRssi before filtering, makes signal adjust to desired value 3, i.e. the second target power value 3 before filtering, as 58dB.Then according to the comparison of PreRssi and InBandRssi, poor with filtered signal power before obtaining filtering, adjust the gain of the first digital gain amplifier, such as, signal power before filtering and filtered signal power difference 20dB, namely filtered signal power is 58dB-20dB=38dB, then the gain arranging the first digital gain amplifier is 2dB, thus target power value after the signal before entering FFT being adjusted to filtering, namely first object performance number is adjusted to, 38dB+2dB=40dB.
When can so analogize for during other threshold values.
In addition, in the present embodiment, by described receiver and wireless network obtain synchronous premised on.And in other embodiments of the present invention, when described receiver does not obtain synchronous with wireless network, then the signal that can disturb outward cancellation band after the filtering carries out the statistics of received signal strength indicator PostRssi after filtering.When having that band is outer to be disturbed, the signal power PreRssi before filtering and there are differences between filtered signal power PostRssi, and when not having that band is outer to be disturbed, the difference between both is little.So just can be judged whether there is the outer interference of band and be with the degree of outer interference and go to adjust gain by the difference comparing PreRssi and PostRssi power.Institute can also comprise the following steps in this way: when described receiver does not obtain synchronous with wireless network,
S201 ': obtain received signal strength indicator PreRssi before the filtering of the described wireless signal after described ADC process,
S202 ': obtain received signal strength indicator PostRssi after the filtering of the described wireless signal exported from described baseband filter,
S203 ': according to the power difference of described PreRssi and PostRssi, adjust the gain of described radio-frequency module and the gain of described first digital gain amplifier, reach first object performance number with the performance number entered before described FFT module after making described wireless signal filtering.
The present embodiment adds a digital gain amplifier after the filter, received signal strength indicator InBandRssi in received signal strength indicator PreRssi and band is obtained before filtering respectively by the method for the present embodiment, can Interference Detection out and get the intensity of interference when there is interference, then go according to interference and the difference of available signal power the gain adjusting rf gain and digital gain amplifier in various degree conversely again, thus it is saturated to ensure that radiofrequency signal can not occur, available signal power can be amplified to again enough large simultaneously, do not cause performance loss.In addition, filtered signal power can also be made to remain on relatively more fixing scope, decrease the impact that subsequent module is caused because signal power fluctuates.
Fig. 4 is the flow chart of another embodiment of the present invention method.The present embodiment method is the expansion of a upper embodiment.The present embodiment is on the basis of a upper embodiment, a digital gain amplifier i.e. the second digital gain amplifier is turn increased before filtering, namely in the present embodiment, described receiver also comprises the second digital gain amplifier, and described wireless signal first enters described baseband filter again after described ADC exports after described second digital gain amplifier process.
The object increasing by the second digital gain amplifier is: in the above-described embodiments, if rf gain is enough large, then directly by controlling rf gain, signal power can be adjusted to the target power before filtering, if but rf gain is not enough large, so in the present embodiment then can by control rf gain together with the second digital gain amplifier just signal power adjust to the target power before filtering.In addition, after adding the second digital gain amplifier, before filtering, just had rf gain and the second digital gain amplifier two kinds of adjustable gain, thus improve the flexibility of adjustment, adaptability is stronger.Be understandable that, in the present embodiment, if make the second digital gain amplifier not come into force, so the present embodiment just deteriorates to an embodiment.
After adding the second digital gain amplifier, the present embodiment method still obtains PreRssi and InBandRssi as above-described embodiment, and namely step S201 and S202 is constant.And because increased the second digital gain amplifier newly, so step S203 can be slightly different when specific implementation, namely, process signal power being adjusted to the target power before filtering (i.e. the second target power value) has been divided into two steps, first by adjustment rf gain, signal power is adjusted to the 3rd target power value, and then by adjustment second digital gain amplifier, signal power is adjusted to the second target power value.In other words, in the present embodiment, step S203 specifically can comprise:
S2031 ': the gain adjusting described radio-frequency module according to the power difference of described PreRssi and described InBandRssi, reaches the 3rd target power value to make the performance number of described wireless signal after described radio-frequency module process;
S2032 ': the gain adjusting described second digital gain amplifier, reaches the second target power value to make the performance number of described wireless signal after described second digital gain amplifier;
S2033 ': the gain adjusting described first digital gain amplifier, reaches first object performance number with the performance number entered before described FFT module after making described wireless signal filtering.
The circuit diagram of the present embodiment can be shown in Figure 5.The present embodiment is on the basis of a upper embodiment, a digital gain amplifier i.e. the second digital gain amplifier 306 is turn increased before filtering, namely in the present embodiment, described receiver also comprises the second digital gain amplifier 306, and described wireless signal first enters described baseband filter 303 again after exporting from described ADC after described second digital gain amplifier 306 processes.In Figure 5, specifically perform above-mentioned steps by gain regulator 307, comprise and gather PreRssi and InBandRssi data respectively, and send Gain tuning order respectively to radio-frequency module 301, first digital gain amplifier 305 and the second digital gain amplifier 306.
Below in conjunction with concrete numerical value, the present embodiment is further detailed:
Similar with a upper embodiment, generally, the present embodiment is utilize the intensity of several threshold values to interference to divide when implementing, according to the difference of interference strength, first by adjustment rf gain, wireless signal is adjusted to the 3rd target power value, then signal power adjusted to further power target value i.e. the second target power value before filtering by the second digital gain amplifier, signal power adjusted to power target value, i.e. first object performance number after unified filtering by the gain of adjustment first digital gain amplifier again after filtering.
When interference strength is less than thresholding 0, such as thresholding 0 is 6dB, then can according to the gain of method adjustment rf gain when not disturbing with first, second digital gain amplifier.
When interference strength is greater than thresholding 0, is less than thresholding 1, such as thresholding 1 is 12dB, then according to the PreRssi before filtering, first adjust and increase rf gain, signal is adjusted to the 3rd target power value 1, such as 40dB, and target power value 1 i.e. the second target power value 1 is 46dB before filtering, 3rd target power value 1 and the second target power value 1 difference 6dB, then make the gain of the second digital gain amplifier be 6dB again, thus signal adjusted to the second i.e. 40dB of target power value 1.Then, similar to the above embodimentsly, according to the comparison of PreRssi and InBandRssi, poor with filtered signal power before obtaining filtering, go the gain of adjustment first digital gain amplifier, thus the signal before entering FFT the most at last adjusts to target power value and first object performance number 40dB after filtering.
When interference strength is greater than thresholding 1, is less than thresholding 2, such as thresholding 2 is 18dB, then according to the PreRssi before filtering, first adjust and increase rf gain, signal is adjusted to the 3rd target power value 2, such as 40dB, and target power value 2 i.e. the second target power value 2 is 52dB before filtering, 3rd target power value 2 and the second target power value 2 difference 12dB, so the gain configuring the second digital gain amplifier is again 12dB, thus adjust to the second i.e. 52dB of target power value 2 by signal.
Also may there is another kind of situation, namely rf gain is large not, then now first rf gain can be transferred to maximum, signal power is adjusted to 36dB, and then the gain configuring the second digital gain amplifier is 16dB, thus signal is allowed to reach target power value 2 i.e. 52dB before filtering.Certainly, if rf gain is enough large, then the second digital gain amplifier can be made to lose efficacy, namely only adjust rf gain, just signal can be adjusted to before order filtering target power value 2, now just be equivalent to the scheme in an embodiment.Now still there is relation one to one between antenna opening signal strength signal intensity and rf gain, but corresponding content is different with corresponding relation when not disturbing.Visible, specifically how adjust rf gain and the second digital gain amplifier in phase unique to reach the method for target power value before filtering, to this, the embodiment of the present invention does not limit.
After this, again according to the comparison of PreRssi and InBandRssi, obtain before filtering and filtered signal power poor, go the gain of adjustment first digital gain amplifier, thus the signal before entering FFT the most at last adjusts to target power value and first object performance number 40dB after filtering.
When interference strength is greater than thresholding 2, be less than thresholding 3, such as thresholding 3 is 24dB, then according to the PreRssi before filtering, first adjust and increase rf gain, signal is adjusted to the 3rd target power value 3, such as 40dB, and before filtering, target power value 3 i.e. the second target power value 3 is 58dB, the 3rd target power value 3 and the second target power value 3 difference 18dB, the gain then configuring the second digital gain amplifier is again 18dB, thus signal is adjusted to the second i.e. 40dB of target power value 3.Also may there is another kind of situation, namely rf gain is large not, then now first rf gain can be transferred to maximum, signal power is adjusted to 36dB, and then the gain making the second digital gain amplifier is 22dB, thus signal is allowed to reach target power value 3 i.e. 58dB before filtering.After this, again according to the comparison of PreRssi and InBandRssi, obtain before filtering and filtered signal power poor, go the gain of adjustment first digital gain amplifier, thus the signal before entering FFT the most at last adjusts to target power value and first object performance number 40dB after filtering.
When can so analogize for during other threshold values.
The present embodiment not only adds a digital gain amplifier after the filter, before filter, also add a digital gain amplifier, received signal strength indicator InBandRssi in received signal strength indicator PreRssi and band is obtained before filtering respectively by the method for the present embodiment, can Interference Detection out and get the intensity of interference when there is interference, then go according to interference and the difference of available signal power the gain adjusting rf gain and two digital gain amplifier in various degree conversely again, thus it is saturated to ensure that radiofrequency signal can not occur, available signal power can be amplified to again enough large simultaneously, do not cause performance loss.In addition, filtered signal power can also be made to remain on relatively more fixing scope, decrease the impact that subsequent module is caused because signal power fluctuates.
A kind of equipment is provided in further embodiment of this invention, described equipment is a kind of wireless signal receiver, shown in Figure 3, described receiver comprises radio-frequency module 301, analog to digital converter ADC302, baseband filter 303, first digital gain amplifier 305, fast fourier transform FFT module 304 and gain regulator 307; Wireless signal in described wireless signal receiver successively through the process of described radio-frequency module, analog to digital converter, baseband filter, the first digital gain amplifier, fast fourier transform FFT module;
Described gain regulator 307 comprises:
PreRssi acquisition module, for obtain when described receiver and wireless network synchronous after, obtain received signal strength indicator PreRssi before the filtering of the described wireless signal after described ADC process.This module can be specifically an interface.
InBandRssi acquisition module, for obtain when described receiver and wireless network synchronous after, received signal strength indicator InBandRssi in the band obtaining the described wireless signal after described FFT resume module.This module can be specifically an interface.
Adjusting module, for the power difference according to described PreRssi and InBandRssi, adjust the gain of described radio-frequency module and the gain of described first digital gain amplifier, reach first object performance number with the performance number entered before described FFT module after making described wireless signal filtering.
Preferably, described adjusting module can be specifically the processor realized by logical integrated circuit, and described receiver can also comprise: memory, and for storing software program command, described adjusting module is by running described software program instructions work.
In the present embodiment, preferably, described adjusting module can be specifically for:
Adjust the gain of described radio-frequency module according to the power difference of described PreRssi and InBandRssi, reach the second target power value with the performance number before making described wireless signal filtering;
Adjust the gain of described first digital gain amplifier, reach first object performance number with the performance number entered before described FFT module after making described wireless signal filtering.
In addition, described gain regulator 307 can also comprise:
PostRssi acquisition module, for when described receiver does not obtain synchronous with wireless network, obtains received signal strength indicator PostRssi after the filtering of the described wireless signal exported from described baseband filter;
Described PreRssi acquisition module, also for when described receiver does not obtain synchronous with wireless network, obtains received signal strength indicator PreRssi before the filtering of the described wireless signal after described ADC process,
Described adjusting module, also for the power difference according to described PreRssi and PostRssi, adjust the gain of described radio-frequency module and the gain of described first digital gain amplifier, reach first object performance number with the performance number entered before described FFT module after making described wireless signal filtering.
For apparatus embodiments, because it corresponds essentially to embodiment of the method, so relevant part illustrates see the part of embodiment of the method.Apparatus embodiments described above is only schematic, the wherein said unit illustrated as separating component or can may not be and physically separates, parts as unit display can be or may not be physical location, namely can be positioned at a place, or also can be distributed in multiple network element.Some or all of module wherein can be selected according to the actual needs to realize the object of the present embodiment scheme.Those of ordinary skill in the art, when not paying creative work, are namely appreciated that and implement.
The present embodiment adds a digital gain amplifier after the filter, received signal strength indicator InBandRssi in received signal strength indicator PreRssi and band can be obtained before filtering respectively by the gain regulator of the present embodiment, can Interference Detection out and get the intensity of interference when there is interference, then go according to interference and the difference of available signal power the gain adjusting rf gain and digital gain amplifier in various degree conversely again, thus it is saturated to ensure that radiofrequency signal can not occur, available signal power can be amplified to again enough large simultaneously, do not cause performance loss.In addition, filtered signal power can also be made to remain on relatively more fixing scope, decrease the impact that subsequent module is caused because signal power fluctuates.
Provide a kind of equipment in yet another embodiment of the invention, described equipment is a kind of wireless signal receiver.The equipment of the present embodiment is based on the equipment of a upper embodiment, on the basis of a upper embodiment equipment, described receiver also comprises the second digital gain amplifier 306, shown in Figure 5, described wireless signal first enters described baseband filter 303 again after exporting from analog to digital converter ADC302 after described second digital gain amplifier 306 processes; Described gain regulator 307 specifically for:
Adjust the gain of described radio-frequency module according to the power difference of described PreRssi and InBandRssi, reach the 3rd target power value to make the performance number of described wireless signal after described radio-frequency module process;
Adjust the gain of described second digital gain amplifier, reach the second target power value to make the performance number of described wireless signal after described second digital gain amplifier;
Adjust the gain of described first digital gain amplifier, reach first object performance number with the performance number entered before described FFT module after making described wireless signal filtering.
Preferably, adjusting module can be processor, and this processor can use logical integrated circuit circuit realiration, for running the software program instructions in storage memory in receivers, to carry out adjustment and the control of gain.
In addition, the equipment of the present embodiment also as above can comprise the correlation module for carrying out processing when described receiver does not obtain synchronous with wireless network by an embodiment equipment like that, does not repeat them here.
For apparatus embodiments, because it corresponds essentially to embodiment of the method, so relevant part illustrates see the part of embodiment of the method.Apparatus embodiments described above is only schematic, the wherein said unit illustrated as separating component or can may not be and physically separates, parts as unit display can be or may not be physical location, namely can be positioned at a place, or also can be distributed in multiple network element.Some or all of module wherein can be selected according to the actual needs to realize the object of the present embodiment scheme.Those of ordinary skill in the art, when not paying creative work, are namely appreciated that and implement.
The present embodiment not only adds a digital gain amplifier after filter, before filter, also add a digital gain amplifier, received signal strength indicator InBandRssi in received signal strength indicator PreRssi and band can be obtained before filtering respectively by the gain regulator of the present embodiment, can Interference Detection out and get the intensity of interference when there is interference, then go according to interference and the difference of available signal power the gain adjusting rf gain and two digital gain amplifier in various degree conversely again, thus it is saturated to ensure that radiofrequency signal can not occur, available signal power can be amplified to again enough large simultaneously, do not cause performance loss.In addition, filtered signal power can also be made to remain on relatively more fixing scope, decrease the impact that subsequent module is caused because signal power fluctuates.
Be understandable that, one of ordinary skill in the art will appreciate that all or part of step realized in said method execution mode is that the hardware that can carry out instruction relevant by program has come, described program can be stored in computer read/write memory medium, here the alleged storage medium obtained, as: ROM, RAM, magnetic disc, CD etc.
Also it should be noted that, in this article, the such as relational terms of first and second grades and so on is only used for an entity or operation to separate with another entity or operating space, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment comprising described key element and also there is other identical element.
The foregoing is only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.Apply specific case herein to have carried out lock to principle of the present invention and execution mode and state, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications.In sum, this description should not be construed as limitation of the present invention.All any amendments done within the spirit and principles in the present invention, equivalent replacement, improvement etc., be all included in protection scope of the present invention.
Claims (8)
1. a gain adjusting method, it is characterized in that, for wireless signal receiver, in the receiver, wireless signal is successively through the process of radio-frequency module, analog to digital converter ADC, baseband filter, the first digital gain amplifier, fast fourier transform FFT module; Described method comprises:
When described receiver and wireless network obtain synchronous after, obtain received signal strength indicator PreRssi before the filtering of the described wireless signal after described ADC process,
Received signal strength indicator InBandRssi in the band of the described wireless signal of acquisition after described FFT resume module,
According to the power difference of described PreRssi and InBandRssi, adjust the gain of described radio-frequency module and the gain of described first digital gain amplifier, reach first object performance number with the performance number entered before described FFT module after making described wireless signal filtering;
Wherein, the described power difference according to described PreRssi and InBandRssi, adjust the gain of described radio-frequency module and the gain of described first digital gain amplifier, reach first object performance number with the performance number entered before described FFT module after making described wireless signal filtering and comprise:
Adjust the gain of described radio-frequency module according to the power difference of described PreRssi and InBandRssi, reach the second target power value with the performance number before making described wireless signal filtering;
Adjust the gain of described first digital gain amplifier, reach first object performance number with the performance number entered before described FFT module after making described wireless signal filtering.
2. method according to claim 1, is characterized in that, described receiver also comprises the second digital gain amplifier, and described wireless signal first enters described baseband filter again after described ADC exports after described second digital gain amplifier process;
According to the power difference of described PreRssi and InBandRssi, adjust the gain of described radio-frequency module and the gain of described first digital gain amplifier, reach first object performance number with the performance number entered before described FFT module after making described wireless signal filtering and comprise:
Adjust the gain of described radio-frequency module according to the power difference of described PreRssi and InBandRssi, reach the 3rd target power value to make the performance number of described wireless signal after described radio-frequency module process;
Adjust the gain of described second digital gain amplifier, reach the second target power value to make the performance number of described wireless signal after described second digital gain amplifier;
Adjust the gain of described first digital gain amplifier, reach first object performance number with the performance number entered before described FFT module after making described wireless signal filtering.
3. the method according to any one of claim 1 ~ 2, is characterized in that, described method also comprises:
When described receiver does not obtain synchronous with wireless network, obtain received signal strength indicator PreRssi before the filtering of the described wireless signal after described ADC process,
Received signal strength indicator PostRssi after the filtering of the described wireless signal that acquisition exports from described baseband filter,
According to the power difference of described PreRssi and PostRssi, adjust the gain of described radio-frequency module and the gain of described first digital gain amplifier, reach first object performance number with the performance number entered before described FFT module after making described wireless signal filtering.
4. a wireless signal receiver, is characterized in that, comprising: radio-frequency module, analog to digital converter ADC, baseband filter, the first digital gain amplifier, fast fourier transform FFT module and gain regulator; Wireless signal in described wireless signal receiver successively through the process of described radio-frequency module, analog to digital converter ADC, baseband filter, the first digital gain amplifier, fast fourier transform FFT module;
Described gain regulator comprises:
PreRssi acquisition module, for obtain when described receiver and wireless network synchronous after, obtain received signal strength indicator PreRssi before the filtering of the described wireless signal after described ADC process,
InBandRssi acquisition module, for obtain when described receiver and wireless network synchronous after, received signal strength indicator InBandRssi in the band obtaining the described wireless signal after described FFT resume module,
Adjusting module, for the power difference according to described PreRssi and InBandRssi, adjust the gain of described radio-frequency module and the gain of described first digital gain amplifier, reach first object performance number with the performance number entered before described FFT module after making described wireless signal filtering;
Wherein, described adjusting module specifically for:
Adjust the gain of described radio-frequency module according to the power difference of described PreRssi and InBandRssi, reach the second target power value with the performance number before making described wireless signal filtering;
Adjust the gain of described first digital gain amplifier, reach first object performance number with the performance number entered before described FFT module after making described wireless signal filtering.
5. receiver according to claim 4, is characterized in that, described receiver also comprises the second digital gain amplifier, and described wireless signal first enters described baseband filter again after described ADC exports after described second digital gain amplifier process; Described adjusting module specifically for:
Adjust the gain of described radio-frequency module according to the power difference of described PreRssi and InBandRssi, reach the 3rd target power value to make the performance number of described wireless signal after described radio-frequency module process;
Adjust the gain of described second digital gain amplifier, reach the second target power value to make the performance number of described wireless signal after described second digital gain amplifier;
Adjust the gain of described first digital gain amplifier, reach first object performance number with the performance number entered before described FFT module after making described wireless signal filtering.
6. the receiver according to any one of claim 4 ~ 5, is characterized in that, described gain regulator also comprises:
PostRssi acquisition module, for when described receiver does not obtain synchronous with wireless network, obtains received signal strength indicator PostRssi after the filtering of the described wireless signal exported from described baseband filter;
Described PreRssi acquisition module, also for when described receiver does not obtain synchronous with wireless network, obtains received signal strength indicator PreRssi before the filtering of the described wireless signal after described ADC process,
Described adjusting module, also for the power difference according to described PreRssi and PostRssi, adjust the gain of described radio-frequency module and the gain of described first digital gain amplifier, reach first object performance number with the performance number entered before described FFT module after making described wireless signal filtering.
7. the receiver according to any one of claim 4 ~ 5, it is characterized in that, described adjusting module is the processor realized by logical integrated circuit, and described receiver also comprises: memory, for storing software program command, described adjusting module is by running described software program instructions work.
8. the receiver according to any one of claim 4 ~ 5, is characterized in that, the power difference of described PreRssi and InBandRssi reflects the intensity that the band of described wireless signal disturbs outward.
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| CN104467911A (en) * | 2013-09-18 | 2015-03-25 | 联想(北京)有限公司 | Antenna mode adjustment method, antenna mode adjustment device and mobile terminal |
| CN104581919B (en) * | 2013-10-24 | 2018-06-01 | 展讯通信（上海）有限公司 | A kind of automatic growth control adjustment system and method equipped with signal strength detection |
| TWI565232B (en) * | 2014-04-16 | 2017-01-01 | 微晶片科技公司 | Gain control method, module, and wireless signal receiver using the same |
| CN108616974B (en) * | 2016-12-09 | 2021-05-25 | 炬芯科技股份有限公司 | Gain and power adjusting method and device |
| CN106712812A (en) * | 2016-12-20 | 2017-05-24 | 宇龙计算机通信科技(深圳)有限公司 | Bluetooth terminal, and Bluetooth receiving circuit and gain control method thereof |
| CN108377503B (en) * | 2018-04-03 | 2024-02-02 | 广州供电局有限公司 | Signal coverage device, signal coverage system and field deployment method |
| CN110518922B (en) * | 2019-08-29 | 2021-06-22 | 成都精位科技有限公司 | Receiving gain adjusting method and device and wireless receiver |
| CN112543008A (en) * | 2019-09-23 | 2021-03-23 | 武汉芯泰科技有限公司 | Gain control method and device |
| CN115941411B (en) * | 2022-07-04 | 2023-07-28 | 上海星思半导体有限责任公司 | Signal processing method, device, electronic equipment and storage medium |
| CN114866116B (en) * | 2022-07-05 | 2022-09-27 | 深圳市汇顶科技股份有限公司 | Near field communication method and near field communication device |
| CN115755110B (en) * | 2022-11-22 | 2023-12-19 | 航天恒星科技有限公司 | Navigation receiver based on adjustable radio frequency gain and anti-interference method thereof |
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