CN104348499A - Method for lowering influence of cross modulation interference on terminal receiving signal - Google Patents
Method for lowering influence of cross modulation interference on terminal receiving signal Download PDFInfo
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- CN104348499A CN104348499A CN201310337168.7A CN201310337168A CN104348499A CN 104348499 A CN104348499 A CN 104348499A CN 201310337168 A CN201310337168 A CN 201310337168A CN 104348499 A CN104348499 A CN 104348499A
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Abstract
The invention provides a method for lowering the influence of cross modulation interference on a terminal receiving signal. The method comprises the following steps: in a terminal synchronization keeping process, performing state transition under the following condition: in an ordinary working state, turning on a low-noise amplifier, detecting whether cross modulation interference exists, and if so, entering an anti-cross modulation interference state; in the anti-cross modulation interference working state, turning off the low-noise amplifier, detecting whether cross modulation interference exists, and if not, returning to the ordinary state; when the low-noise amplifier is turned off by a terminal, compensating for a reception simulation gain in order to keep the energy of a sampled signal reaching a baseband stable and constant. After adoption of the method, the anti-cross modulation interference state can be entered rapidly when cross modulation interference exists. As proved by testing and verification, a remarkable anti-cross modulation interference effect is achieved in the presence of cross modulation interference.
Description
Technical field
The present invention relates to wireless communication field, particularly relate to a kind of method reducing intermodulation distortion and terminal received signals is affected.
Background technology
When two or more different frequency signals acts on a nonlinear circuit, by phase inter-modulation, produce new frequency signal to export, if this frequency just in time drops in operation of receiver channel width, then form the interference to this receiver, we are referred to as intermodulation distortion, and intermodulation distortion can not be improved along with the raising of receiving filter performance, and in the communications field, harm is larger.
Mutually be modulated to example with two frequency signal f1 and f2, the new frequency signal of generation has: second order inter-modulation product: f1+f2, f1-f2, third order intermodulation product: 2f1+f2,2f1-f2, f1+2f2, f1-2f2, and the intermodulation product of more high-order, intermodulation exponent number more high signal intensity is more weak.Prevent the measure of intermodulation distortion from being receive the intermodulation product that more than three rank or three rank should be avoided as far as possible and weaken to frequency conversion device, because these pickup electrodes likely drop in operation of receiver channel width at present.
Current anti-intermodulation distortion measure is all go to consider from hardware point of view, while introducing hardware cost expense, cannot solve the interference problem of the 2f1-f2 third order intermodulation product that on-site terminal produces because of the stronger signal of near band.Such as, 1800M(1785M-1805M for McWiLL) system, on-the-spot intermodulation distortion derives from the outer GSM signal intermodulation of band usually to the interference signal in McWiLL system band, GSM signal is at this near band and interference ratio is stronger, although the second order inter-modulation product of GSM signal can not drop into the 1800M terminal works band limits of McWiLL signal, third order intermodulation signal can cause interference to the terminal of 1800M.As shown in Figure 1, suppose that McWiLL terminal works is on 1801M frequency, i.e. fc=1801.5M, GSM interference signal has two frequency bins, f1=1806+a, f2=1811-b, wherein (a, b ∈ [0,5]), third order intermodulation product 2f1-f2=1801+2a+b, as long as meet 2a+b ∈ [-0.5,0.5], third order intermodulation product just can be fallen in the 1M frequency band range of terminal works.Make a=0.2, b=0, then 2f1-f2 ∈ [1800.5,1801.5], band outer interference intermodulation is in band, and the interference ratio caused terminal comparatively by force, and the non-linear of McWiLL terminal hardware cannot resist this strong jamming.
Summary of the invention
In order to solve the problem, the present invention proposes a kind of by control LNA(low noise amplifier) reduce the method that intermodulation distortion affects terminal received signals.In general, terminal does not need when received signal strength is enough large to use LNA, and just open LNA at received signal strength lower than time threshold value (being generally-55db), therefore the present invention is applicable to the situation that the little LNA of causing of received signal strength is in open mode.Its principle is, but closes LNA when opening LNA, and signal and noise are all reduced, and the amplitude that the Amplitude Ratio noise due to signal reduction reduces is little, and final signal to noise ratio is improved.The method comprises:
In terminal synchronizes keep-process, carry out state transitions according to following condition: under common operating state, open low noise amplifier, and detect whether there is intermodulation distortion, if existed, then enter anti-intermodulation distortion state; Under anti-intermodulation distortion operating state, close low noise amplifier, and detect intermodulation distortion and whether exist, if there is no, then return normal state; While terminal closes low noise amplifier, the signal energy after needing the compensation of increase to reception analog gain to make the sampling of arrival base band is stablized constant.
Preferably, terminal, under common operating state, detects after there is intermodulation distortion, does not enter anti-intermodulation distortion state immediately, but is introduced into transition operation such; Terminal is under transition operation such, only close the low noise amplifier of synchronous head time slot, whether the signal quality simultaneously detecting synchronous head is improved than common operating state and reaches and improve requirement, if reached, then enter anti-intermodulation distortion state, otherwise return normal state.Here, described to improve requirement can be that the mean value of the carrier/interface ratio of continuous K frame synchronization head is greater than threshold value, and K is greater than 1, also can be set to other requirement.
Preferably, the initial condition arranging terminal is common operating state.
Preferably, terminal judges whether to there is intermodulation distortion by the carrier/interface ratio value calculating synchronous head, concrete judgement can realize as follows: terminal is under common operating state, calculate the carrier/interface ratio value of synchronous head, if continuous N frame is less than threshold value 1, then think to there is intermodulation distortion, M is greater than 1; Terminal is under anti-intermodulation distortion operating state, every N frame opens the low noise amplifier of synchronous head, the mean value p of carrier/interface ratio value of synchronous head of N frame that statistics continuous T the is secondary and mean value q of the carrier/interface ratio value of the synchronous head of N-1 frame, if p is greater than threshold value 2 or p threshold value more than 3 larger than q, then not think to there is intermodulation distortion.
In said method, by the carrier/interface ratio value of adding up synchronous head, terminal judges whether current Received Signal is subject to the interference of intermodulation signal, and then the transfer of control terminal operating state.But, terminal in synchronizing process, because not knowing that synchronous head data are where, then cannot detect intermodulation distortion by the carrier/interface ratio value of synchronous head, also just cannot determine synchronous after the operating state of terminal.Preferably, carry out the anti-intermodulation distortion of synchronizing process in the following manner: fixedly sweep S during terminal synchronizes and enclose all frequencies, S is more than or equal to 2, when sweeping the second circle, close low noise amplifier to go to obtain synchronously, if terminal is on the second circle is synchronous, then think now there is intermodulation distortion, terminal enters anti-intermodulation distortion operating state; Otherwise, enter common operating state.In general, S gets 3 for optimum value.
Preferably, when said method is used for McWiLL system, increase the compensation to receiving analog gain by the gain control word that gain in selection automatic gain control calibration table is larger.
The present invention achieves the anti-intermodulation distortion function of terminal by the mechanism of state machine, relates to three operating states altogether: common operating state, think that terminal is not subject to intermodulation distortion in synchronous keep-process; Transition operation such, thinks that terminal has intermodulation distortion, goes closedown LNA to see if there is and improved; Anti-intermodulation distortion operating state, thinks and now needs to close LNA to realize anti-intermodulation distortion function.After adopting the present invention, anti-intermodulation distortion state can be entered fast when having detected that intermodulation distortion exists.After tested and checking, under the condition having intermodulation distortion, anti-intermodulation distortion Be very effective, after terminal enters anti-intermodulation distortion state, synchronous head carrier/interface ratio and business time-slot signal to noise ratio obviously promote.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of GSM signal to the intermodulation distortion of McWiLL signal;
Fig. 2 is the connection diagram that the GSM signal of embodiment one emulates the intermodulation distortion of McWiLL signal;
Fig. 3 is the state transition diagram of the McWiLL terminal of embodiment one;
Fig. 4 is the A condition of embodiment one continuous 8 frame synchronization head cinr Data-Statistics charts when adding interference;
Fig. 5 is the B state of embodiment one continuous 8 frame synchronization head cinr Data-Statistics charts when adding interference;
Fig. 6 is that the C state of embodiment one connects 8 cycles the 31st frame and the 32nd frame synchronization head cinr Data-Statistics chart when adding interference;
Fig. 7 connects 8 cycle the 31st frames and the 32nd frame synchronization head cinr Data-Statistics chart after the C state of embodiment one removes interference;
Fig. 8 is that employing the inventive method of embodiment one is carried out anti-intermodulation distortion and contrasted chart with the downstream rate of not carrying out anti-intermodulation distortion.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.
Embodiment one: the anti-intermodulation distortion in synchronous keep-process
The present embodiment emulates the intermodulation distortion of McWiLL signal for GSM signal, as shown in Figure 2, power splitter side connects McWiLL base station signal and GSM interference signal, and opposite side is connected with McWiLL terminal by radio-frequency maser, in the synchronous keep-process of the TDD of terminal, add GSM interference signal.Wherein, the center frequency point of McWiLL base station signal is 1800M, only opens 1 sub-carrier wave set (namely bandwidth is 1MHz); The center frequency point of GSM interference signal is 1806.5MHz, and bandwidth is 5MHz, is generated by signal generator.So, the third order intermodulation product of GSM interference signal, by falling in the 1M frequency band range of McWiLL base station signal, causes stronger interference to McWiLL terminal.Specifically describe the process that McWiLL terminal realizes anti-intermodulation distortion below.
The present embodiment is first by regulating the adjustable attenuator in Fig. 2 to make received signal strength at below-55db, then terminal LNA is in open mode.Then adopt the present invention to carry out anti-intermodulation distortion, the condition that McWiLL terminal describes according to state transition diagram in Fig. 3 carries out state transitions, specifically describes as follows:
(1) A condition: common operating state, the LNA of synchronous head time slot and business time-slot all normally opens.Calculate the carrier/interface ratio of synchronous head, i.e. cinr value, if continuous 8 frames are less than 15db, transfers to B state; Otherwise, keep A condition.
(2) B state: transition operation such, the LNA of synchronous head time slot closes, the LNA of business time-slot opens, need the receiving gain compensating the loss of synchronous head time slot by the gain control word that gain in automatic gain control calibration table (AGC table) is larger, make the synchronous head signal energy stabilization after the sampling of arrival base band constant.Continuous 8 frames close the LNA of synchronous head, if the mean value of the synchronous head cinr under comparing normal state is good, and the mean value of continuous 8 frame synchronization head cinr is greater than 15, then transfer to C state; Otherwise, get back to A condition.
(3) C state: anti-intermodulation distortion operating state, the LNA of synchronous head time slot and business time-slot all closes, and this just needs the receiving gain of recovering damage by the gain control word that gain in AGC table is larger, the signal energy after the sampling of arrival base band is stablized constant.Every 32 frames open the LNA of synchronous head, add up the cinr mean value of continuous 8 times, and add up the cinr mean value that 8 order 31 frames close LNA, if the former is 3db more than larger than the latter, or the former is greater than 18, then transfer to A condition; Otherwise, keep C state.
Here is the data that the present embodiment obtains in actual measurement, and its state migration procedure is as follows:
A () terminal initial is A condition, the LNA of synchronous head time slot and business time-slot normally opens.Add GSM signal disturbing in the synchronous keep-process of TDD after, the cinr value of continuous 8 frame synchronization heads as shown in Figure 4.Because continuous 8 frames are less than 15db, then forward B state to by A condition.
Under (b) B state, close continuously the LNA of synchronous head time slot, and the cinr value of adding up synchronous head as shown in Figure 5.Good than under A condition of the mean value of the cinr of continuous 8 frame synchronization heads under B state, and be greater than 15db, then forward C state to by B state.
C, under () C state, the LNA of synchronous head time slot and business time-slot all closes, and with the receiving gain that the gain control word that gain in AGC table is larger is recovered damage, the signal energy after the sampling of arrival base band is stablized constant.Now GSM signal disturbing sustainable existence, opens the LNA of synchronous head every 32 frames, the value of the cinr of statistics synchronous head, continuously 8 cycles of statistics, as shown in Figure 6.Contrast the cinr mean value that the 32nd frame opens synchronous head LNA and the 31st frame closedown synchronous head LNA, the former cinr value is not improved, and meets jump condition, therefore remains on C state.
Under (d) C state, manually remove GSM signal disturbing.Still the LNA of synchronous head is opened every 32 frames, the value of the cinr of statistics synchronous head, continuously 8 cycles of statistics, as shown in Figure 7.Now, the mean value that the 32nd frame opens continuous 8 times of synchronous head LNA is greater than 18db, meets jump condition, illustrates that now intermodulation distortion does not exist or smaller, then exits C state, get back to A condition.
The present embodiment makes McWiLL base station strength for-70dbm by regulating the adjustable attenuator in Fig. 2, then under testing the outer interference strength of different band, adopt the inventive method to carry out anti-intermodulation distortion and the downstream rate of not carrying out anti-intermodulation distortion, obtain Data Comparison result as shown in Figure 8.Can find out, anti-intermodulation distortion Be very effective of the present invention, downstream rate significantly improves.
Embodiment two: anti-intermodulation distortion time synchronous
The present embodiment, based on embodiment one, supposes that terminal there occurs step-out and carries out re-synchronization.Then first opening low noise amplifier, fixedly sweeping all frequencies of three circles, when sweeping the second circle, close low noise amplifier to go to obtain synchronously, if terminal is on the second circle is synchronous, then think now there is intermodulation distortion, terminal enters anti-intermodulation distortion operating state; Otherwise, enter common operating state.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. reduce the method that intermodulation distortion affects terminal received signals, it is characterized in that, described method comprises:
In terminal synchronizes keep-process, carry out state transitions according to following condition: under common operating state, open low noise amplifier, and detect whether there is intermodulation distortion, if existed, then enter anti-intermodulation distortion state; Under anti-intermodulation distortion operating state, close low noise amplifier, and detect intermodulation distortion and whether exist, if there is no, then return normal state;
While terminal closes low noise amplifier, the signal energy after needing the compensation of increase to reception analog gain to make the sampling of arrival base band is stablized constant.
2. method according to claim 1, it is characterized in that, terminal, under common operating state, detects after there is intermodulation distortion, does not enter anti-intermodulation distortion state immediately, but is introduced into transition operation such; Terminal is under transition operation such, only close the low noise amplifier of synchronous head time slot, whether the signal quality simultaneously detecting synchronous head is improved than common operating state and reaches and improve requirement, if reached, then enter anti-intermodulation distortion state, otherwise return normal state.
3. method according to claim 2, is characterized in that, described improvement requires that the mean value of the carrier/interface ratio for continuous K frame synchronization head is greater than threshold value, and K is greater than 1.
4. one of method according to claims 1 to 3, is characterized in that, described method also comprises: the initial condition arranging terminal is common operating state.
5. one of method according to claims 1 to 3, is characterized in that, judges whether to there is intermodulation distortion by the carrier/interface ratio value calculating synchronous head.
6. method according to claim 5, is characterized in that, terminal is under common operating state, and calculate the carrier/interface ratio value of synchronous head, if continuous N frame is less than threshold value 1, then think to there is intermodulation distortion, M is greater than 1; Terminal is under anti-intermodulation distortion operating state, every N frame opens the low noise amplifier of synchronous head, the mean value p of carrier/interface ratio value of synchronous head of N frame that statistics continuous T the is secondary and mean value q of the carrier/interface ratio value of the synchronous head of N-1 frame, if p is greater than threshold value 2 or p threshold value more than 3 larger than q, then not think to there is intermodulation distortion.
7. one of method according to claims 1 to 3, it is characterized in that, described method also comprises: during terminal synchronizes, fixedly sweep S and enclose all frequencies, S is more than or equal to 2, when sweeping the second circle, close low noise amplifier to go to obtain synchronously, if terminal is on the second circle is synchronous, then think now there is intermodulation distortion, terminal enters anti-intermodulation distortion operating state; Otherwise, enter common operating state.
8. method according to claim 7, it is characterized in that, S equals 3.
9. one of method according to claims 1 to 3, is characterized in that, described method is used for McWiLL system, increases the compensation to receiving analog gain by the gain control word that gain in selection automatic gain control calibration table is larger.
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| CN201310337168.7A CN104348499B (en) | 2013-08-05 | 2013-08-05 | A kind of reduce the method that terminal received signals is affected by intermodulation distortion |
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| CN201310337168.7A CN104348499B (en) | 2013-08-05 | 2013-08-05 | A kind of reduce the method that terminal received signals is affected by intermodulation distortion |
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| CN105991147A (en) * | 2015-02-13 | 2016-10-05 | 展讯通信（上海）有限公司 | Communication receiving access and control method thereof |
| CN107454026B (en) * | 2017-07-31 | 2018-04-06 | 西安科技大学 | Third order intermodulation suppresses and the method for reseptance and receiver of DC-offset correction component |
| CN110311706A (en) * | 2019-04-23 | 2019-10-08 | 维沃移动通信有限公司 | A kind of interference processing method and mobile terminal |
| CN110376624A (en) * | 2019-07-12 | 2019-10-25 | 维沃移动通信有限公司 | A kind of localization method and mobile terminal |
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