CN102820898A - Gain regulation method and equipment - Google Patents
Gain regulation method and equipment Download PDFInfo
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- CN102820898A CN102820898A CN2012102453789A CN201210245378A CN102820898A CN 102820898 A CN102820898 A CN 102820898A CN 2012102453789 A CN2012102453789 A CN 2012102453789A CN 201210245378 A CN201210245378 A CN 201210245378A CN 102820898 A CN102820898 A CN 102820898A
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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 changes through regular meeting, and its major influence factors comprises wireless channel decline, load size, power control, apart from base station location distance or the like.Stable receiver needs bigger reception dynamic range.For the bit wide that reduces numeric field to save cost, need according to the intensity that receives signal, adopt automatic gain control (Automatic Gain Control; AGC) mode, the gain of adjustment radio-frequency devices, the perhaps gain of digital baseband; Signal is carried out the analog or digital territory to be regulated; Thereby overcome that above-mentioned reception is dynamic, the influence of big or small or the like the aspect of load, receiving signal is whole to a suitable scope, quantize through analog to digital converter ADC (Analog to Digital Converter) again; Thereby the minimizing bit wide reduces cost.
In wireless communication system, for example Long Term Evolution (long term evolution, LTE) system; Outside the useful signal bandwidth, exist very strong non-desired signal to disturb through regular meeting, if can not be correct detect this interference and, adjust to reasonable levels to signal simultaneously its elimination; The saturation distortion that then can cause radio-frequency devices; Perhaps the available signal power level is not enough, influences the operate as normal of receiver, causes that throughput descends.The adjustment that gains of two kinds of methods is arranged in the prior art usually:
A kind of method is through broadband RSSI (the Receive Signal Strength Indication before the statistics baseband filter; Receive the signal strength signal intensity indication) generate and simulate the AGC gain; Signal power after the ADC is adjusted on the fixing desired value; Thereby guarantee that as far as possible radio frequency analog devices such as mixer (frequency mixer), ADC are unsaturated, referring to shown in Figure 1.The shortcoming of this scheme is, if when the outer interference signal of band is big especially, adds up baseband filter front signal power; And adjust rf gain with this power; Though signal can not take place when the radio-frequency devices saturatedly so, the power of useful signal can be very little, possibly not reach the signal to noise ratio of demodulation requirement; Thereby cause higher error code, reduce throughput.The power of signal is not constant after wave filter in addition, changes with interference power is different with the ratio of available signal power, and is influential for follow-up algorithm.
Another kind method is that the arrowband RSSI behind the statistics baseband filter generates simulation AGC gain, filtered signal is adjusted on the fixing desired value, thereby guaranteed that useful signal can reach maximum desired value, also can be referring to shown in Figure 1.The shortcoming of this scheme is, if the outer interference signal of band is big especially, when adding up the signal power behind the baseband filtering; Mainly be the power of useful signal, when adjusting rf gain, because the signal that radio-frequency devices receives comprises useful signal and interference signal with this power; So total signal power can be very big; Cause radio-frequency devices saturated, cause error code, reduce throughput.
It is thus clear that when exist disturbing, prior art can't be adjusted to desirable state with gain, that is, prior art can't not only guarantee that radiofrequency signal can not take place but also can be amplified to available signal power enough greatly the saturated while.
Summary of the invention
In view of this, the purpose of the embodiment of the invention provides a kind of gain adjusting method and equipment, can be amplified to available signal power enough big again so that radiofrequency signal can not take place by the saturated while.
The embodiment of the invention provides a kind of gain adjusting method; Be used for wireless signal receiver; In said receiver, wireless signal passes through the processing of radio-frequency module, analog to digital converter ADC, baseband filter, the first digital gain amplifier, FFT FFT module successively; Said method comprises:
After said receiver and wireless network obtain synchronously, receive signal strength signal intensity indication PreRssi before obtaining the filtering of the said wireless signal after said ADC handles,
Obtain and receive signal strength signal intensity indication InBandRssi in the band of the said wireless signal after said FFT resume module,
Power difference according to said PreRssi and InBandRssi; Adjust the gain and the said first digital gain Amplifier Gain of said radio-frequency module, so that the performance number that gets into after the said wireless signal filtering before the said FFT module reaches first target power value.
Preferably:
Said power difference according to said PreRssi and InBandRssi; Adjust the gain and the said first digital gain Amplifier Gain of said radio-frequency module, reach first target power value and comprise so that get into performance number before the said FFT module after the said wireless signal filtering:
Adjust the gain of said radio-frequency module according to the power difference of said PreRssi and InBandRssi, so that the performance number before the said wireless signal filtering reaches second target power value;
Adjust the said first digital gain Amplifier Gain, so that the performance number that gets into after the said wireless signal filtering before the said FFT module reaches first target power value.
Preferably:
Said receiver also comprises the second digital gain amplifier, and said wireless signal gets into said baseband filter after handling through the said second digital gain amplifier earlier from said ADC output back again;
Power difference according to said PreRssi and InBandRssi; Adjust the gain and the said first digital gain Amplifier Gain of said radio-frequency module, reach first target power value and comprise so that get into performance number before the said FFT module after the said wireless signal filtering:
Adjust the gain of said radio-frequency module according to the power difference of said PreRssi and InBandRssi, so that the performance number of said wireless signal after said radio-frequency module is handled reaches the 3rd target power value;
Adjust the said second digital gain Amplifier Gain, so that the performance number of said wireless signal behind the said second digital gain amplifier reaches second target power value;
Adjust the said first digital gain Amplifier Gain, so that the performance number that gets into after the said wireless signal filtering before the said FFT module reaches first target power value.
Preferably, said method also comprises:
When said receiver and wireless network do not obtain when synchronous, receive signal strength signal intensity indication PreRssi before obtaining the filtering of the said wireless signal after said ADC handles,
Obtain after the filtering of the said wireless signal of said baseband filter output and receive signal strength signal intensity indication PostRssi,
According to the power difference of said PreRssi and PostRssi, adjust the gain and the said first digital gain Amplifier Gain of said radio-frequency module, so that the performance number that gets into after the said wireless signal filtering before the said FFT module reaches first target power value.
The embodiment of the invention has increased a digital gain amplifier after filter; Obtain preceding signal strength signal intensity indication PreRssi and the interior signal strength signal intensity indication InBandRssi that receives of band of receiving of filtering more respectively; So when exist disturbing, can come out Interference Detection and get access to interference intensity; Then according to disturb with the difference of available signal power go to adjust rf gain and digital gain Amplifier Gain in various degree conversely again; Thereby it is saturated to guarantee that radiofrequency signal can not take place, and can be amplified to available signal power enough greatly again simultaneously, does not cause performance loss.In addition, can also make filtered signal power remain on relatively more fixing scope, reduce because the influence that the signal power fluctuation causes subsequent module.
The embodiment of the invention also provides a kind of wireless signal receiver, comprising: radio-frequency module, analog to digital converter ADC, baseband filter, the first digital gain amplifier, FFT FFT module and gain regulator; Wireless signal passes through the processing of said radio-frequency module, analog to digital converter ADC, baseband filter, the first digital gain amplifier, FFT FFT module successively in said wireless signal receiver;
Said gain regulator comprises:
The PreRssi acquisition module is used for after said receiver and wireless network obtain synchronously, receives signal strength signal intensity indication PreRssi before obtaining the filtering of the said wireless signal after said ADC handles,
The InBandRssi acquisition module is used for after said receiver and wireless network obtain synchronously, and obtain in the band of the said wireless signal after said FFT resume module and receive signal strength signal intensity indication InBandRssi,
Adjusting module; Be used for power difference according to said PreRssi and InBandRssi; Adjust the gain and the said first digital gain Amplifier Gain of said radio-frequency module, so that the performance number that gets into after the said wireless signal filtering before the said FFT module reaches first target power value.
Preferably, said adjusting module specifically is used for:
Adjust the gain of said radio-frequency module according to the power difference of said PreRssi and InBandRssi, so that the performance number before the said wireless signal filtering reaches second target power value;
Adjust the said first digital gain Amplifier Gain, so that the performance number that gets into after the said wireless signal filtering before the said FFT module reaches first target power value.
Preferably, said receiver also comprises the second digital gain amplifier, and said wireless signal gets into said baseband filter after handling through the said second digital gain amplifier earlier from said ADC output back again; Said adjusting module specifically is used for:
Adjust the gain of said radio-frequency module according to the power difference of said PreRssi and InBandRssi, so that the performance number of said wireless signal after said radio-frequency module is handled reaches the 3rd target power value;
Adjust the said second digital gain Amplifier Gain, so that the performance number of said wireless signal behind the said second digital gain amplifier reaches second target power value;
Adjust the said first digital gain Amplifier Gain, so that the performance number that gets into after the said wireless signal filtering before the said FFT module reaches first target power value.
Preferably, said gain regulator also comprises:
The PostRssi acquisition module is used for not obtaining when synchronous when said receiver and wireless network, obtains after the filtering of the said wireless signal of said baseband filter output and receives signal strength signal intensity indication PostRssi;
Said PreRssi acquisition module also is used for not obtaining when synchronous when said receiver and wireless network, receives signal strength signal intensity indication PreRssi before obtaining the filtering of the said wireless signal after said ADC handles,
Said adjusting module; Also be used for power difference according to said PreRssi and PostRssi; Adjust the gain and the said first digital gain Amplifier Gain of said radio-frequency module, so that the performance number that gets into after the said wireless signal filtering before the said FFT module reaches first target power value.
Preferably, said adjusting module is the processor of being realized by logical integrated circuit, and said receiver also comprises: memory, be used for the storing software program command, and said adjusting module is through the said software program instructions work of operation.
Preferably, the power difference of said PreRssi and InBandRssi reflects the outer interference intensity of band of said wireless signal.
Present embodiment has not only increased a digital gain amplifier after filter; Also before filter, increased a digital gain amplifier; Obtain respectively to receive before the filtering in signal strength signal intensity indication PreRssi and the band through the method for present embodiment and receive signal strength signal intensity indication InBandRssi; When exist disturbing, can come out Interference Detection and get access to interference intensity, then according to disturb with the difference of available signal power go to adjust the gain of rf gain and two digital gain amplifiers in various degree conversely again, thereby it is saturated to guarantee that radiofrequency signal can not take place; Can be amplified to available signal power enough greatly again simultaneously, not cause performance loss.In addition, can also make filtered signal power remain on relatively more fixing scope, reduce because the influence that the signal power fluctuation causes subsequent module.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is a circuit diagram in the 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
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
Referring to Fig. 2, be the flow chart of one embodiment of the invention method.Said method is used for wireless signal receiver, and in said receiver, wireless signal passes through the processing of radio-frequency module, analog to digital converter ADC, baseband filter, the first digital gain amplifier, FFT FFT module successively.Said method comprises: after said receiver and wireless network acquisition synchronously,
S201: receive signal strength signal intensity indication PreRssi before obtaining the filtering of the said wireless signal after said ADC handles.
S202: obtain and receive signal strength signal intensity indication InBandRssi in the band of the said wireless signal after said FFT resume module.What the InBandRssi after the FFT added up is the power of useful signal.
S203: according to the power difference of said PreRssi and InBandRssi; Adjust the gain and the said first digital gain Amplifier Gain of said radio-frequency module, so that the performance number that gets into after the said wireless signal filtering before the said FFT module reaches first target power value.Wherein, the power difference of said PreRssi and InBandRssi reflects the outer interference intensity of band of said wireless signal.
The circuit diagram of present embodiment can be referring to shown in Figure 3.In said receiver, said wireless signal passes through the processing of radio-frequency module 301, analog to digital converter ADC302, baseband filter 303, the first digital gain amplifier 305, FFT FFT module 304 successively.In Fig. 3, specifically carry out above-mentioned steps by gain regulator 307, comprise and gather PreRssi and InBandRssi data respectively, and send gain adjustment order to the radio-frequency module and the first digital gain amplifier respectively.
The basic principle of present embodiment is: the wireless signal in the LTE system is passed through radio frequency processing; Down-convert to baseband signal, and the process analog to digital converter (Analog to Digital Converter, ADC); Become digital signal, and receive signal strength signal intensity indication PreRssi before the statistical filtering.Handle signal through baseband filter then, remove the outer interference of band.Wherein said baseband filter can be FIR (Finite Impulse Response, finite impulse response).The signal of removing after disturbing is amplified through the first digital gain amplifier; Give fast Fourier transform (Fast Fourier Transform again; FFT) resume module, and the statistics to indicating InBandRssi through the signal of conversion with interior reception signal strength signal intensity are used PreRssi and InBandRssi to differentiate and whether are had obstruction; And the degree of blocking; Produce two control signals according to these results at last, control the gain and the first digital gain Amplifier Gain of radio-frequency module respectively, make that receiving signal is in suitable level.
In the present embodiment, preferred, step S203 specifically can may further comprise the steps:
S2031: adjust the gain of said radio-frequency module according to the power difference of said PreRssi and said InBandRssi, so that the performance number before the said wireless signal filtering reaches second target power value;
S2032: adjust the said first digital gain Amplifier Gain, so that the performance number that gets into after the said wireless signal filtering before the said FFT module reaches first target power value.
Below in conjunction with concrete numerical value, present embodiment is further explained:
That at first summarizes says; Present embodiment is to utilize several threshold values that interference intensity is divided when implementing; Difference according to interference strength; Through the adjustment rf gain wireless signal is adjusted to before the different filtering i.e. second target power value of power target value, through adjusting the first digital gain Amplifier Gain signal power is adjusted to power target value, i.e. first target power value after the unified filtering again after the filtering.
When interference strength less than thresholding 0, for example thresholding 0 is 6dB, then the adjustment rf gain of the method when not disturbing and the first digital gain Amplifier Gain make and all adjust to first target power value with filtered signal before the filtering, for example adjust to 40dB.Before obtaining synchronously, use PreRssi, after obtaining synchronously; Use InBandRssi, calculate the intensity of antenna opening signal, have form one to one between antenna opening signal strength signal intensity and the rf gain; Different antennas mouth signal intensity is used different rf gains; After thereby the antenna opening signal that can make unlike signal intensity amplifies through rf gain, obtain the first onesize target power value, i.e. 40dB.
When interference strength greater than thresholding 0, less than thresholding 1, for example thresholding 1 is 12dB, then according to the PreRssi before filtering adjustment rf gain, makes signal adjust to desired value 1 before the filtering, i.e. second target power value 1 is like 46dB.Desired value 1 has relation with thresholding 1 before the filtering.Specifically can carry out according to the adjustment of the PreRssi before filtering rf gain,, deduct a constant through PreRssi through tabling look-up; Deduct the used gain of current radio frequency again, can obtain antenna opening power, according to antenna opening power; Look into an AGC table, just can confirm rf gain.And PreRssi can pass through sum (I
2+ Q
2)/2N calculates acquisition, wherein I
2For receive signal on the path I road square, Q
2For receive signal on the path Q road square, sum (I
2+ Q
2) represent adding up of interior signal power of a period of time, such as a symbol or a sub-frame, N is an accumulative frequency.Then according to the comparison of PreRssi and InBandRssi, it is poor with filtered signal power to obtain before the filtering, adjusts the first digital gain Amplifier Gain; Signal power and the filtered signal power difference 10dB before the filtering for example; Be that filtered signal power is 46dB-10dB=36dB, it is 4dB that the first digital gain Amplifier Gain then is set, and adjusts to target power value after the filtering thereby will get into signal before the FFT; Promptly adjust to first target power value, 36dB+4dB=40dB.InBandRssi depends on the signal power that gets before the filtering, and the inhibition ability of filter, and InBandRssi specifically can pass through sum ' (A
2+ B
2)/2N obtains, wherein A
2Be a number of sub-carrier A road signal square, B
2Be a number of sub-carrier B road signal square, sum ' (A
2+ B
2) in frequency range of expression subcarrier signals power with, in a symbol, perhaps in the sub-frame, N is an accumulative frequency.
When interference strength greater than thresholding 1, less than thresholding 2, for example thresholding 2 is 18dB, then according to the PreRssi before filtering adjustment rf gain, makes signal adjust to desired value 2 before the filtering, i.e. second target power value 2 is like 52dB.Then according to the comparison of PreRssi and InBandRssi, it is poor with filtered signal power to obtain before the filtering, adjusts the first digital gain Amplifier Gain; Signal power and the filtered signal power difference 16dB before the filtering for example; Be that filtered signal power is 52dB-16dB=36dB, it is 4dB that the first digital gain Amplifier Gain then is set, and adjusts to target power value after the filtering thereby will get into signal before the FFT; Promptly adjust to first target power value, 36dB+4dB=40dB.
When interference strength greater than thresholding 2, less than thresholding 3, for example thresholding 3 is 24dB, then according to the PreRssi before filtering adjustment rf gain, makes signal adjust to desired value 3 before the filtering, i.e. second target power value 3 is like 58dB.Then according to the comparison of PreRssi and InBandRssi, it is poor with filtered signal power to obtain before the filtering, adjusts the first digital gain Amplifier Gain; Signal power and the filtered signal power difference 20dB before the filtering for example; Be that filtered signal power is 58dB-20dB=38dB, it is 2dB that the first digital gain Amplifier Gain then is set, and adjusts to target power value after the filtering thereby will get into signal before the FFT; Promptly adjust to first target power value, 38dB+2dB=40dB.
When for other threshold values, can so analogize.
In addition, in the present embodiment, obtaining with said receiver and wireless network is prerequisite synchronously.And in other embodiment of the present invention, when said receiver and wireless network do not obtain then can after filtering, carry out receiving the statistics that signal strength signal intensity is indicated PostRssi after the filtering to eliminating the outer interference signals of band when synchronous.Exist when band is outer to be disturbed, there are differences between signal power PreRssi before the filtering and the filtered signal power PostRssi, and do not exist when band is outer to be disturbed, the difference between the two is little.So just can judge whether to have the degree of disturbing outside outer interference of band and the band and go adjustment to gain through the difference that compares PreRssi and PostRssi power.So said method can also may further comprise the steps: when said receiver and wireless network do not obtain when synchronous,
S201 ': receive signal strength signal intensity indication PreRssi before obtaining the filtering of the said wireless signal after said ADC handles,
S202 ': obtain after the filtering of the said wireless signal of said baseband filter output and receive signal strength signal intensity indication PostRssi,
S203 ': according to the power difference of said PreRssi and PostRssi; Adjust the gain and the said first digital gain Amplifier Gain of said radio-frequency module, so that the performance number that gets into after the said wireless signal filtering before the said FFT module reaches first target power value.
Present embodiment has increased a digital gain amplifier after filter; Obtain respectively to receive before the filtering in signal strength signal intensity indication PreRssi and the band through the method for present embodiment and receive signal strength signal intensity indication InBandRssi; When exist disturbing, can come out Interference Detection and get access to interference intensity; Then according to disturb with the difference of available signal power go to adjust rf gain and digital gain Amplifier Gain in various degree conversely again; Thereby it is saturated to guarantee that radiofrequency signal can not take place, and can be amplified to available signal power enough greatly again simultaneously, does not cause performance loss.In addition, can also make filtered signal power remain on relatively more fixing scope, reduce because the influence that the signal power fluctuation causes subsequent module.
Fig. 4 is the flow chart of another embodiment of the present invention method.The present embodiment method is the expansion of a last embodiment.Present embodiment is on the basis of a last embodiment; Before filtering, increased the i.e. second digital gain amplifier of a digital gain amplifier again; In the present embodiment promptly; Said receiver also comprises the second digital gain amplifier, and said wireless signal gets into said baseband filter after handling through the said second digital gain amplifier earlier from said ADC output back again.
The purpose that increases by the second digital gain amplifier is: in the above-described embodiments; If rf gain is enough big; Then can be directly signal power be adjusted to the target power before the filtering through the control rf gain; If but rf gain is not enough big, so in the present embodiment then can through control rf gain and the second digital gain amplifier together just signal power adjust to the target power before the filtering.After having increased by the second digital gain amplifier in addition, rf gain and two kinds of Gain Adjustable of the second digital gain amplifier have just been arranged before filtering, thereby improved the flexibility of adjustment, adaptability is stronger.It is understandable that in the present embodiment, if make the second digital gain amplifier not come into force, present embodiment has just deteriorated to an embodiment so.
After having increased by the second digital gain amplifier, the present embodiment method is still obtained PreRssi and InBandRssi as above-mentioned embodiment, and promptly step S201 and S202 are constant.And because increased the second digital gain amplifier newly; So step S203 can be slightly different when concrete the realization; Promptly; The process of signal power being adjusted to the target power (i.e. second target power value) before the filtering was divided into for two steps, through the adjustment rf gain signal power was adjusted to the 3rd target power value earlier, and then through adjusting the second digital gain amplifier signal power was adjusted to second target power value.In other words, in the present embodiment, step S203 specifically can comprise:
S2031 ': adjust the gain of said radio-frequency module according to the power difference of said PreRssi and said InBandRssi, so that the performance number of said wireless signal after said radio-frequency module is handled reaches the 3rd target power value;
S2032 ': adjust the said second digital gain Amplifier Gain, so that the performance number of said wireless signal behind the said second digital gain amplifier reaches second target power value;
S2033 ': adjust the said first digital gain Amplifier Gain, so that the performance number that gets into after the said wireless signal filtering before the said FFT module reaches first target power value.
The circuit diagram of present embodiment can be referring to shown in Figure 5.Present embodiment is on the basis of a last embodiment; Before filtering, increased the i.e. second digital gain amplifier 306 of a digital gain amplifier again; In the present embodiment promptly; Said receiver also comprises the second digital gain amplifier 306, and said wireless signal gets into said baseband filter 303 after handling through the said second digital gain amplifier 306 earlier from said ADC output back again.In Fig. 5; Specifically carry out above-mentioned steps by gain regulator 307; Comprise and gather PreRssi and InBandRssi data respectively, and send gain adjustment order to radio-frequency module 301, the first digital gain amplifier 305 and the second digital gain amplifier 306 respectively.
Below in conjunction with concrete numerical value, present embodiment is further explained:
Similar with a last embodiment; That summarizes says; Present embodiment is to utilize several threshold values that interference intensity is divided when implementing; According to the difference of interference strength, earlier wireless signal is adjusted to the 3rd target power value through the adjustment rf gain, through the second digital gain amplifier signal power is further adjusted to before the filtering i.e. second target power value of power target value then; Through adjusting the first digital gain Amplifier Gain signal power is adjusted to power target value, i.e. first target power value after the unified filtering again after the filtering.
When interference strength less than thresholding 0, for example thresholding 0 is 6dB, method adjustment rf gain and first, second digital gain Amplifier Gain that then can be when not disturbing.
When interference strength greater than thresholding 0, less than thresholding 1, for example thresholding 1 is 12dB, then according to the PreRssi before the filtering; Transfer earlier to increase rf gain, adjust to the 3rd target power value 1 to signal, such as 40dB; And target power value 1 is that second target power value 1 is 46dB before the filtering; The 3rd target power value 1 and second target power value 1 difference 6dB make then that the second digital gain Amplifier Gain is 6dB again, are 40dB thereby signal is adjusted to second target power value 1.Then; Ground similar to the above embodiments; Comparison according to PreRssi and InBandRssi; It is poor with filtered signal power to obtain before the filtering, goes to adjust the first digital gain Amplifier Gain, adjusts to after the filtering the i.e. first target power value 40dB of target power value thereby get into signal before the FFT the most at last.
When interference strength greater than thresholding 1, less than thresholding 2, for example thresholding 2 is 18dB, then according to the PreRssi before the filtering; Transfer earlier to increase rf gain, adjust to the 3rd target power value 2 to signal, such as 40dB; And target power value 2 is that second target power value 2 is 52dB before the filtering; The 3rd target power value 2 and second target power value, 2 difference 12dB are 12dB so dispose the second digital gain Amplifier Gain again, are 52dB thereby signal is adjusted to second target power value 2.
Also has another kind of situation; Be that rf gain is big inadequately, then can be transferred to maximum to rf gain earlier this moment, adjust to 36dB to signal power; And then to dispose the second digital gain Amplifier Gain be 16dB, thereby let signal reach that target power value 2 is 52dB before the filtering.Certainly,, then can make the second digital gain amplifier lose efficacy, promptly only adjust rf gain, just can adjust to before the order filtering target power value 2 to signal, just be equivalent to the scheme among the embodiment at this moment if rf gain is enough big.Still exist one to one relation between antenna opening signal strength signal intensity and the rf gain this moment, but the corresponding relation of corresponding content when not disturbing is different.It is thus clear that it is not unique to reach before the filtering method of target power value specifically how to adjust the rf gain and the second digital gain amplifier in phase, to this, the embodiment of the invention does not limit.
After this; Again according to the comparison of PreRssi and InBandRssi; It is poor with filtered signal power to obtain before the filtering, goes to adjust the first digital gain Amplifier Gain, adjusts to after the filtering the i.e. first target power value 40dB of target power value thereby get into signal before the FFT the most at last.
When interference strength greater than thresholding 2, less than thresholding 3, for example thresholding 3 is 24dB; Then, transfer earlier to increase rf gain, adjust to the 3rd target power value 3 to signal according to the PreRssi before the filtering; Such as 40dB, and target power value 3 is that second target power value 3 is 58dB before the filtering, the 3rd target power value 3 and second target power value, 3 difference 18dB; Then disposing the second digital gain Amplifier Gain again is 18dB, is 40dB thereby signal is adjusted to second target power value 3.Also has another kind of situation; Be that rf gain is big inadequately, then can be transferred to maximum to rf gain earlier this moment, adjust to 36dB to signal power; And then to make the second digital gain Amplifier Gain be 22dB, thereby let signal reach that target power value 3 is 58dB before the filtering.After this; Again according to the comparison of PreRssi and InBandRssi; It is poor with filtered signal power to obtain before the filtering, goes to adjust the first digital gain Amplifier Gain, adjusts to after the filtering the i.e. first target power value 40dB of target power value thereby get into signal before the FFT the most at last.
When for other threshold values, can so analogize.
Present embodiment has not only increased a digital gain amplifier after filter; Also before filter, increased a digital gain amplifier; Obtain respectively to receive before the filtering in signal strength signal intensity indication PreRssi and the band through the method for present embodiment and receive signal strength signal intensity indication InBandRssi; When exist disturbing, can come out Interference Detection and get access to interference intensity, then according to disturb with the difference of available signal power go to adjust the gain of rf gain and two digital gain amplifiers in various degree conversely again, thereby it is saturated to guarantee that radiofrequency signal can not take place; Can be amplified to available signal power enough greatly again simultaneously, not cause performance loss.In addition, can also make filtered signal power remain on relatively more fixing scope, reduce because the influence that the signal power fluctuation causes subsequent module.
A kind of equipment is provided in further embodiment of this invention; Said equipment is a kind of wireless signal receiver; Referring to shown in Figure 3, said receiver comprises radio-frequency module 301, analog to digital converter ADC302, baseband filter 303, the first digital gain amplifier 305, FFT FFT module 304 and gain regulator 307; Wireless signal passes through the processing of said radio-frequency module, analog to digital converter, baseband filter, the first digital gain amplifier, FFT FFT module successively in said wireless signal receiver;
Said gain regulator 307 comprises:
The PreRssi acquisition module is used for after said receiver and wireless network obtain synchronously, receives signal strength signal intensity indication PreRssi before obtaining the filtering of the said wireless signal after said ADC handles.This module specifically can be an interface.
The InBandRssi acquisition module is used for after said receiver and wireless network obtain synchronously, obtains in the band of the said wireless signal after said FFT resume module and receives signal strength signal intensity indication InBandRssi.This module specifically can be an interface.
Adjusting module; Be used for power difference according to said PreRssi and InBandRssi; Adjust the gain and the said first digital gain Amplifier Gain of said radio-frequency module, so that the performance number that gets into after the said wireless signal filtering before the said FFT module reaches first target power value.
Preferably, said adjusting module specifically can be the processor of being realized by logical integrated circuit, and said receiver can also comprise: memory, be used for the storing software program command, and said adjusting module is through the said software program instructions work of operation.
In the present embodiment, preferred, said adjusting module can specifically be used for:
Adjust the gain of said radio-frequency module according to the power difference of said PreRssi and InBandRssi, so that the performance number before the said wireless signal filtering reaches second target power value;
Adjust the said first digital gain Amplifier Gain, so that the performance number that gets into after the said wireless signal filtering before the said FFT module reaches first target power value.
In addition, said gain regulator 307 can also comprise:
The PostRssi acquisition module is used for not obtaining when synchronous when said receiver and wireless network, obtains after the filtering of the said wireless signal of said baseband filter output and receives signal strength signal intensity indication PostRssi;
Said PreRssi acquisition module also is used for not obtaining when synchronous when said receiver and wireless network, receives signal strength signal intensity indication PreRssi before obtaining the filtering of the said wireless signal after said ADC handles,
Said adjusting module; Also be used for power difference according to said PreRssi and PostRssi; Adjust the gain and the said first digital gain Amplifier Gain of said radio-frequency module, so that the performance number that gets into after the said wireless signal filtering before the said FFT module reaches first target power value.
For apparatus embodiments, because it corresponds essentially to method embodiment, so relevant part gets final product referring to the part explanation of method embodiment.Apparatus embodiments described above only is schematic; Wherein said unit as the separating component explanation can or can not be physically to separate also; The parts that show as the unit can be or can not be physical locations also; Promptly can be positioned at a place, perhaps also can be distributed on a plurality of NEs.Can realize the purpose of present embodiment scheme according to the needs selection some or all of module wherein of reality.Those of ordinary skills promptly can understand and implement under the situation of not paying creative work.
Present embodiment has increased a digital gain amplifier after filter; Gain regulator through present embodiment can obtain respectively to receive before the filtering in signal strength signal intensity indication PreRssi and the band and receive signal strength signal intensity indication InBandRssi; When exist disturbing, can come out Interference Detection and get access to interference intensity; Then according to disturb with the difference of available signal power go to adjust rf gain and digital gain Amplifier Gain in various degree conversely again; Thereby it is saturated to guarantee that radiofrequency signal can not take place, and can be amplified to available signal power enough greatly again simultaneously, does not cause performance loss.In addition, can also make filtered signal power remain on relatively more fixing scope, reduce because the influence that the signal power fluctuation causes subsequent module.
A kind of equipment is provided in yet another embodiment of the invention, and said equipment is a kind of wireless signal receiver.The equipment of present embodiment is based on the equipment of a last embodiment; On the basis of a last embodiment equipment; Said receiver also comprises the second digital gain amplifier 306; Referring to shown in Figure 5, said wireless signal gets into said baseband filter 303 after handling through the said second digital gain amplifier 306 earlier from analog to digital converter ADC302 output back again; Said gain regulator 307 specifically is used for:
Adjust the gain of said radio-frequency module according to the power difference of said PreRssi and InBandRssi, so that the performance number of said wireless signal after said radio-frequency module is handled reaches the 3rd target power value;
Adjust the said second digital gain Amplifier Gain, so that the performance number of said wireless signal behind the said second digital gain amplifier reaches second target power value;
Adjust the said first digital gain Amplifier Gain, so that the performance number that gets into after the said wireless signal filtering before the said FFT module reaches first target power value.
Preferably, adjusting module can be a processor, and this processor can use the logical integrated circuit circuit to realize, is used for moving the software program instructions in the memory that is stored in receiver, so that adjustment that gains and control.
In addition, the equipment of present embodiment also as above an embodiment equipment that kind comprise and be used for not obtaining the correlation module handled when synchronous when said receiver and wireless network, repeat no more at this.
For apparatus embodiments, because it corresponds essentially to method embodiment, so relevant part gets final product referring to the part explanation of method embodiment.Apparatus embodiments described above only is schematic; Wherein said unit as the separating component explanation can or can not be physically to separate also; The parts that show as the unit can be or can not be physical locations also; Promptly can be positioned at a place, perhaps also can be distributed on a plurality of NEs.Can realize the purpose of present embodiment scheme according to the needs selection some or all of module wherein of reality.Those of ordinary skills promptly can understand and implement under the situation of not paying creative work.
Present embodiment has not only increased a digital gain amplifier after the filter; Also before filter, increased a digital gain amplifier; Gain regulator through present embodiment can obtain respectively to receive before the filtering in signal strength signal intensity indication PreRssi and the band and receive signal strength signal intensity indication InBandRssi; When exist disturbing, can come out Interference Detection and get access to interference intensity; Then according to the gain of in various degree conversely again removing adjust rf gain and two digital gain amplifiers of interference with the difference of available signal power; Thereby it is saturated to guarantee that radiofrequency signal can not take place, and can be amplified to available signal power enough greatly again simultaneously, does not cause performance loss.In addition, can also make filtered signal power remain on relatively more fixing scope, reduce because the influence that the signal power fluctuation causes subsequent module.
It is understandable that; One of ordinary skill in the art will appreciate that all or part of step that realizes in the said method execution mode is to instruct relevant hardware to accomplish through program; Described program can be stored in the computer read/write memory medium; Here the alleged storage medium that gets, as: ROM, RAM, magnetic disc, CD etc.
Also need to prove; In this article; Relational terms such as first and second grades only is used for an entity or operation are made a distinction with another entity or operation, and not necessarily requires or hint relation or the order that has any this reality between these entities or the operation.And; Term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability; Thereby make and comprise that process, method, article or the equipment of a series of key elements not only comprise those key elements; But also comprise other key elements of clearly not listing, or also be included as this process, method, article or equipment intrinsic key element.Under the situation that do not having much more more restrictions, the key element that limits by statement " comprising ... ", and be not precluded within process, method, article or the equipment that comprises said key element and also have other identical element.
The above is merely preferred embodiment of the present invention, is not to be used to limit protection scope of the present invention.Used concrete example among this paper and principle of the present invention and execution mode have been carried out lock stated, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, part all can change on embodiment and range of application.In sum, this description should not be construed as limitation of the present invention.All any modifications of within spirit of the present invention and principle, being done, be equal to replacement, improvement etc., all be included in protection scope of the present invention.
Claims (10)
1. gain adjusting method; It is characterized in that; Be used for wireless signal receiver, in said receiver, wireless signal passes through the processing of radio-frequency module, analog to digital converter ADC, baseband filter, the first digital gain amplifier, FFT FFT module successively; Said method comprises:
After said receiver and wireless network obtain synchronously, receive signal strength signal intensity indication PreRssi before obtaining the filtering of the said wireless signal after said ADC handles,
Obtain and receive signal strength signal intensity indication InBandRssi in the band of the said wireless signal after said FFT resume module,
Power difference according to said PreRssi and InBandRssi; Adjust the gain and the said first digital gain Amplifier Gain of said radio-frequency module, so that the performance number that gets into after the said wireless signal filtering before the said FFT module reaches first target power value.
2. method according to claim 1 is characterized in that:
Said power difference according to said PreRssi and InBandRssi; Adjust the gain and the said first digital gain Amplifier Gain of said radio-frequency module, reach first target power value and comprise so that get into performance number before the said FFT module after the said wireless signal filtering:
Adjust the gain of said radio-frequency module according to the power difference of said PreRssi and InBandRssi, so that the performance number before the said wireless signal filtering reaches second target power value;
Adjust the said first digital gain Amplifier Gain, so that the performance number that gets into after the said wireless signal filtering before the said FFT module reaches first target power value.
3. method according to claim 1 is characterized in that, said receiver also comprises the second digital gain amplifier, and said wireless signal gets into said baseband filter after handling through the said second digital gain amplifier earlier from said ADC output back again;
Power difference according to said PreRssi and InBandRssi; Adjust the gain and the said first digital gain Amplifier Gain of said radio-frequency module, reach first target power value and comprise so that get into performance number before the said FFT module after the said wireless signal filtering:
Adjust the gain of said radio-frequency module according to the power difference of said PreRssi and InBandRssi, so that the performance number of said wireless signal after said radio-frequency module is handled reaches the 3rd target power value;
Adjust the said second digital gain Amplifier Gain, so that the performance number of said wireless signal behind the said second digital gain amplifier reaches second target power value;
Adjust the said first digital gain Amplifier Gain, so that the performance number that gets into after the said wireless signal filtering before the said FFT module reaches first target power value.
4. according to each described method of claim 1 ~ 3, it is characterized in that said method also comprises:
When said receiver and wireless network do not obtain when synchronous, receive signal strength signal intensity indication PreRssi before obtaining the filtering of the said wireless signal after said ADC handles,
Obtain after the filtering of the said wireless signal of said baseband filter output and receive signal strength signal intensity indication PostRssi,
According to the power difference of said PreRssi and PostRssi, adjust the gain and the said first digital gain Amplifier Gain of said radio-frequency module, so that the performance number that gets into after the said wireless signal filtering before the said FFT module reaches first target power value.
5. a wireless signal receiver is characterized in that, comprising: radio-frequency module, analog to digital converter ADC, baseband filter, the first digital gain amplifier, FFT FFT module and gain regulator; Wireless signal passes through the processing of said radio-frequency module, analog to digital converter ADC, baseband filter, the first digital gain amplifier, FFT FFT module successively in said wireless signal receiver;
Said gain regulator comprises:
The PreRssi acquisition module is used for after said receiver and wireless network obtain synchronously, receives signal strength signal intensity indication PreRssi before obtaining the filtering of the said wireless signal after said ADC handles,
The InBandRssi acquisition module is used for after said receiver and wireless network obtain synchronously, and obtain in the band of the said wireless signal after said FFT resume module and receive signal strength signal intensity indication InBandRssi,
Adjusting module; Be used for power difference according to said PreRssi and InBandRssi; Adjust the gain and the said first digital gain Amplifier Gain of said radio-frequency module, so that the performance number that gets into after the said wireless signal filtering before the said FFT module reaches first target power value.
6. receiver according to claim 5 is characterized in that, said adjusting module specifically is used for:
Adjust the gain of said radio-frequency module according to the power difference of said PreRssi and InBandRssi, so that the performance number before the said wireless signal filtering reaches second target power value;
Adjust the said first digital gain Amplifier Gain, so that the performance number that gets into after the said wireless signal filtering before the said FFT module reaches first target power value.
7. receiver according to claim 5 is characterized in that, said receiver also comprises the second digital gain amplifier, and said wireless signal gets into said baseband filter after handling through the said second digital gain amplifier earlier from said ADC output back again; Said adjusting module specifically is used for:
Adjust the gain of said radio-frequency module according to the power difference of said PreRssi and InBandRssi, so that the performance number of said wireless signal after said radio-frequency module is handled reaches the 3rd target power value;
Adjust the said second digital gain Amplifier Gain, so that the performance number of said wireless signal behind the said second digital gain amplifier reaches second target power value;
Adjust the said first digital gain Amplifier Gain, so that the performance number that gets into after the said wireless signal filtering before the said FFT module reaches first target power value.
8. according to each described receiver of claim 5 ~ 7, it is characterized in that said gain regulator also comprises:
The PostRssi acquisition module is used for not obtaining when synchronous when said receiver and wireless network, obtains after the filtering of the said wireless signal of said baseband filter output and receives signal strength signal intensity indication PostRssi;
Said PreRssi acquisition module also is used for not obtaining when synchronous when said receiver and wireless network, receives signal strength signal intensity indication PreRssi before obtaining the filtering of the said wireless signal after said ADC handles,
Said adjusting module; Also be used for power difference according to said PreRssi and PostRssi; Adjust the gain and the said first digital gain Amplifier Gain of said radio-frequency module, so that the performance number that gets into after the said wireless signal filtering before the said FFT module reaches first target power value.
9. according to each described receiver of claim 5 ~ 8; It is characterized in that said adjusting module is the processor of being realized by logical integrated circuit, said receiver also comprises: memory; Be used for the storing software program command, said adjusting module is through the said software program instructions work of operation.
10. according to each described receiver of claim 5 ~ 9, it is characterized in that the power difference of said PreRssi and InBandRssi reflects the outer interference intensity of the band of said wireless signal.
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