CN1767401A - Intermodulation distortion improving device and method for wide area communication terminal - Google Patents
Intermodulation distortion improving device and method for wide area communication terminal Download PDFInfo
- Publication number
- CN1767401A CN1767401A CNA2005100635848A CN200510063584A CN1767401A CN 1767401 A CN1767401 A CN 1767401A CN A2005100635848 A CNA2005100635848 A CN A2005100635848A CN 200510063584 A CN200510063584 A CN 200510063584A CN 1767401 A CN1767401 A CN 1767401A
- Authority
- CN
- China
- Prior art keywords
- communication terminal
- intermodulation distortion
- wide area
- area communication
- amplitude
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B1/0475—Circuits with means for limiting noise, interference or distortion
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
- H04B17/21—Monitoring; Testing of receivers for calibration; for correcting measurements
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Noise Elimination (AREA)
- Transceivers (AREA)
Abstract
An apparatus for improving an IMD(Inter-Modulation Distortion) component of a broadband communication terminal and a method therefor are provided. A measurement controlling computer commands a broadband communication terminal to initialize a receiving stage and control IMD parameters, and commands an AM signal generator to generate an AM signal. The communication terminal initializes the receiving stage by the controlling command of the computer, and reads the IMD parameters changed by the AM signal to record the read parameters on a non-volatile IMD item. The AM signal generator generates or interrupts the AM signal by the controlling command of the computer. The invention can remove the IMD induced by direct frequency conversion and the sufficient margin of IMD capability is ensured, with effect of improving the receiving end characteristic.
Description
Technical field
The present invention relates to the intermodulation distortion improving device and the method thereof of wide area communication terminal, thereby the parameter that especially relates to a kind of automatic adjustment intermodulation distortion can be eliminated the intermodulation distortion improving device and the method thereof of the wide area communication terminal of the intermodulation distortion that produces because of the Direct Transform frequency.
Background technology
In the past, the resistance and the capacity of the receiving terminal that the hardware of mobile communication terminal serving adjustment is relevant with the intermodulation distortion characteristic were derived best matching value, thereby and the optimum value of the software setting receiving terminal adjustment parameter relevant with the intermodulation distortion characteristic improve the intermodulation distortion performance.
Utilize the mobile communication terminal of superhet frequency translation in time, to eliminate intermodulation distortion through the intermediate frequency section.
But wide area communication terminal directly carries out frequency translation to wireless frequency signal and down conversion is a baseband signal.Directly frequency translation becomes baseband signal from the direct down conversion of high-frequency signal, so intermodulation distortion directly is presented on the baseband signal.
Intermodulation distortion (IMD:Inter-Modulation Distortion) thus be that phase inter-modulation between two frequency f 1 and the f2 causes that 3 items of 2*f1-f2 and 2*f2-f1 mix the modulation composition and produce the phenomenon that signal is distorted near the position of f1 and f2 signal.
Wide area communication terminal should guarantee the abundant boundary of intermodulation distortion is improved the characteristic of receiving terminal.
But, be in the above-mentioned prior art, can not eliminate intermodulation distortion as if wide area communication terminal and will in baseband signal, occur the noise signals that intermodulation distortion causes more than the certain limit, thereby have the low problem of quality of receiving end signal.
Summary of the invention
Therefore, technical problem to be solved by this invention is, adjusts intermodulation distortion improving device and the method thereof that the relevant adjustment of intermodulation distortion parameter can be eliminated the wide area communication terminal of intermodulation distortion thereby provide a kind of automatically with the intermodulation distortion between bioassay standard frequency and the deviation frequency.
For achieving the above object, the invention is characterized in that described device is formed by measuring control computer, wide area communication terminal and amplitude modulation (AM) signal generator.Measure the control computer to the adjustment of the initialization of wide area communication terminal order receiving terminal and intermodulation distortion parameter and to the generation of AM signal generator order AM signal; Wide area communication terminal is according to the control command initiating of measuring the control computer, reads the intermodulation distortion parameter that changes because of the AM signal and it is recorded the intermodulation distortion project; The AM signal generator generates the AM signal or interrupts the AM signal according to the control command of measuring the control computer.
And feature of the present invention also is: described method is made up of 5 steps, that is, wide area communication terminal is according to the step of the initialization command initiating of measuring the control computer; The AM signal generator takes place to invite to generate according to the AM signal of measuring the control computer and has the step of the AM modulation signal of certain deviation amount from standard frequency; Wide area communication terminal is invited according to the delay of measuring the control computer and is given to pass through certain time of delay the step that reads the intermodulation distortion parameter time of delay afterwards; The AM signal generator is invited according to the AM signal interruption of measuring the control computer and is interrupted the step that the AM signal takes place; Wide area communication terminal will invite the intermodulation distortion reference record of reading to arrive the step of each non-volatile intermodulation distortion project according to the record of measuring the control intermodulation distortion parameter that computer read.
Intermodulation distortion between bioassay standard frequency of the present invention and the deviation frequency, automatically adjust wide area communication terminal about the adjustment parameter of intermodulation distortion and eliminate intermodulation distortion, adopt the present invention can eliminate the intermodulation distortion that direct frequency translation causes, guarantee abundant boundary, have the effect of improving the receiving terminal characteristic the intermodulation distortion performance.
Description of drawings
Fig. 1 is the structured flowchart according to the intermodulation distortion improving device of the wide area communication terminal of the embodiment of the invention;
Fig. 2 is the action flow chart according to the intermodulation distortion improving method of the wide area communication terminal of the embodiment of the invention.
Wherein, Reference numeral:
10: measure control computer 20:RS-232 serial line interface
30: wide area communication terminal 40:RF cable
50:AM signal generator 60: wire cable
Embodiment
Below, be described with reference to the accompanying drawings embodiments of the invention.
Fig. 1 is the structured flowchart according to the intermodulation distortion improving device of the wide area communication terminal of the embodiment of the invention, as shown in the figure, forms by measuring control computer 10, wide area communication terminal 30 and AM signal generator 50.Measure the adjustment of the initialization of 10 pairs of wide area communication terminals of control computer, 30 order receiving terminals and intermodulation distortion parameter and to the generation of AM signal generator 50 order AM signals; Wide area communication terminal 30 is according to the control command initiating of measuring control computer 10, reads the intermodulation distortion parameter that changes because of the AM signal and it is recorded the intermodulation distortion project; AM signal generator 50 generates the AM signal or interrupts the AM signal according to the control command of measuring control computer 10.
Mensuration control computer 10 is connected with RS-232 serial line interface 20 with wide area communication terminal 30 and is communicated by letter, and measures control computer 10 and is connected with wire cable 60 with AM signal generator 50, and AM signal generator 50 is connected with RF cable 40 with wide area communication terminal 30.
Measure the initialization of 10 pairs of wide area communication terminals of control computer, 30 order acceptance divisions, 50 orders have the generation of the AM signal of certain deviation amount from standard frequency to the AM signal generator, 30 orders make it read intermodulation distortion parameter (IM2) to wide area communication terminal, the generation of AM signal is interrupted in 50 orders to the AM signal generator, and the mutual adjusting that 30 orders will be read to wide area communication terminal is distorted reference record and distorted variable to non-volatile mutual adjusting.
Wide area communication terminal 30 carries out initialization to digital variable gain amplifier to carry out digital variable gain amplifier DVGA (the Digital VariableGain Amplifier) side-play amount that obtains by reception mensuration according to the initialization command of measuring control computer 10, setting the low noise amplifier is the maximum gain state, with the centre position frequency setting of total frequency range is standard frequency, and read the intermodulation distortion parameter according to the IM2 reading order, and according to the IM2 record order with the intermodulation distortion reference record of being read to non-volatile intermodulation distortion variable.
AM signal generator 50 according to the AM signal of measuring control computer 10 the order generation takes place to have the AM signal of certain deviation amount and it is outputed to wide area communication terminal 30 from standard frequency, and interrupts the generation of AM signal according to the order of AM signal terminating.
Fig. 2 is the action flow chart according to the intermodulation distortion improving method of the wide area communication terminal of the embodiment of the invention, as shown in the figure, form by 5 steps, promptly, wide area communication terminal carries out initialization to digital variable gain amplifier to carry out the DVGA side-play amount that obtains by reception mensuration according to the initialization command of measuring the control computer, setting the low noise amplifier is the maximum gain state, and is the step of standard frequency with the centre position frequency setting of total frequency range; The AM signal generator according to the AM signal of measuring the control computer take place order generate from standard frequency have 15MHz side-play amount, to modulating frequency 20kHz have 56% degree of depth and-step of the AM signal of 20dB m output; Wide area communication terminal invites the time of delay that gives about 5 seconds also through reading the step of intermodulation distortion parameter after time of delay according to the delay of measuring the control computer; The AM signal generator is invited according to the AM signal interruption order of measuring the control computer and is interrupted the step that the AM signal takes place; Wide area communication terminal will invite the IM2 reference record of reading to arrive the step of each non-volatile IM2 project according to the record of measuring the control intermodulation distortion parameter that computer read.
Measure of the initialization of control computer to wide area communication terminal order acceptance division, wide area communication terminal then carries out initialization to digital variable gain amplifier to carry out the DVGA side-play amount that obtains by reception mensuration according to the initialization command of measuring the control computer, and the low noise amplifier is set at the maximum gain state, be standard frequency with the frequency setting in total frequency range centre position.
Measure the control computer order of AM signal generator had the generation of the AM signal of certain deviation amount from standard frequency, the AM signal generator then generate from standard frequency have 15MHz side-play amount, to modulating frequency 20kHz have 56% degree of depth and-the AM signal of 20dB m output.
Thereby measuring the control computer gives the time of delay in about 5 seconds and prevents generation corresponding to the mistake of read value through reading the intermodulation distortion parameter after time of delay wide area communication terminal.
Measure the control computer to wide area communication terminal order read intermodulation distortion parameter (IM2), it is I_value (Range:0～64), q_value (Range:0～63), transconductor_value (Range:0～3) that wide area communication terminal then reads each IM2 parameter.
Measure the control computer generation of AM signal is interrupted in the order of AM signal generator, the AM signal generator will interrupt the AM signal and take place.
Measure the control computer wide area communication terminal order is arrived non-volatile intermodulation distortion variable with the intermodulation distortion reference record of reading, wide area communication terminal then arrives each non-volatile IM2 project (NV_WCDMA_IM2_I_VALUE=I_value with the IM2 reference record of reading, NV_WCDMA_IM2_Q_VALUE=q_value, NV_WCDMA_IM2_TRANSCONDUCTOR_VALUE=transconductor_value).
Wide area communication terminal with measure the control computer, the AM signal generator separates, thereby the conversion that directly begins frequency is guaranteed the abundant boundary of intermodulation distortion performance according to the IM2 parameter that is write down and is carried out wireless action.
As mentioned above, intermodulation distortion between bioassay standard frequency of the present invention and the deviation frequency, automatically adjust wide area communication terminal about the adjustment parameter of intermodulation distortion and eliminate intermodulation distortion, thereby eliminate the intermodulation distortion that direct frequency translation causes, guarantee abundant boundary, have the effect of improving the receiving terminal characteristic the intermodulation distortion performance.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (3)
1, a kind of intermodulation distortion improving device of wide area communication terminal is characterized in that, comprising:
Measure the control computer, it is to the adjustment of the initialization of described wide area communication terminal order receiving terminal and intermodulation distortion parameter and to the generation of amplitude modulation signal generator order amplitude-modulated signal;
Wide area communication terminal, it is according to the described receiving terminal of control command initialization of described mensuration control computer, reads the intermodulation distortion parameter that changes because of described amplitude-modulated signal and it is recorded the intermodulation distortion project;
The amplitude-modulated signal generator, its control command according to described mensuration control computer generates described amplitude-modulated signal or interrupts described amplitude-modulated signal.
2, a kind of intermodulation distortion improving method of wide area communication terminal is characterized in that, comprises the steps:
Wide area communication terminal is according to the initialization command initiating of measuring the control computer;
The amplitude modulation modulation signal that the invitation generation has the certain deviation amount from standard frequency takes place according to the amplitude-modulated signal of described mensuration control computer in the amplitude-modulated signal generator;
Described wide area communication terminal is invited to give to pass through certain time of delay according to the delay of described mensuration control computer and is read the intermodulation distortion parameter described time of delay afterwards;
Described amplitude-modulated signal generator interrupts inviting the described amplitude-modulated signal of interruption to take place according to the amplitude-modulated signal of described mensuration control computer;
Described wide area communication terminal will invite the intermodulation distortion reference record of reading to each non-volatile intermodulation distortion project according to the record of the described mensuration control described intermodulation distortion parameter that computer read.
3, the intermodulation distortion improving method of wide area communication terminal according to claim 2 is characterized in that, the initialization step of described wide area communication terminal also comprises the steps:
Digital variable gain amplifier is carried out initialization to carry out the digital variable gain amplifier side-play amount that obtains by reception mensuration;
The low noise amplifier is set at the maximum gain state;
With the centre position frequency setting of overall frequency range is standard frequency.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020040085942 | 2004-10-26 | ||
| KR1020040085942A KR20060036829A (en) | 2004-10-26 | 2004-10-26 | Method for improving inter-modulation distortion fact of wcdma terminal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1767401A true CN1767401A (en) | 2006-05-03 |
| CN100385801C CN100385801C (en) | 2008-04-30 |
Family
ID=36743039
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100635848A Expired - Fee Related CN100385801C (en) | 2004-10-26 | 2005-04-13 | Intermodulation distortion improving device and method for wide area communication terminal |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR20060036829A (en) |
| CN (1) | CN100385801C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104716972A (en) * | 2013-12-12 | 2015-06-17 | 诺基亚通信公司 | Improvement of receiver sensitivity |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09219666A (en) * | 1996-02-14 | 1997-08-19 | Murata Mfg Co Ltd | Transmission-reception sharing device |
| JPH1022844A (en) * | 1996-07-05 | 1998-01-23 | Fujitsu Ltd | Nonlinear distortion detection circuit and nonlinear distortion compensation circuit for transmitter |
| JP2002368542A (en) * | 2001-06-12 | 2002-12-20 | Matsushita Electric Ind Co Ltd | Broadband fm demodulator, light receiver using the same and optical transmission system |
-
2004
- 2004-10-26 KR KR1020040085942A patent/KR20060036829A/en not_active Application Discontinuation
-
2005
- 2005-04-13 CN CNB2005100635848A patent/CN100385801C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104716972A (en) * | 2013-12-12 | 2015-06-17 | 诺基亚通信公司 | Improvement of receiver sensitivity |
| CN104716972B (en) * | 2013-12-12 | 2018-08-21 | 诺基亚通信公司 | Improve the method and apparatus of receiver sensitivity |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100385801C (en) | 2008-04-30 |
| KR20060036829A (en) | 2006-05-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7440731B2 (en) | Power amplifier with VSWR detection and correction feature | |
| CN1115774C (en) | Method and apparatus for automatic gain control in digital receiver | |
| US6930549B2 (en) | Variable gain amplifier for use in communications | |
| US8879665B2 (en) | Controlling a power amplifier based on transmitter output emissions | |
| US20040017859A1 (en) | Transmitter with limited spectral regrowth and method therefor | |
| CN1697440A (en) | Automatic gain control device in use for multicarrier receiver | |
| EP0935847B1 (en) | Method and apparatus for controlling signal amplitude level | |
| JPH08510892A (en) | Method and apparatus for automatic gain control and DC offset cancellation in a quadrature receiver | |
| US5041793A (en) | Controlled slew rate amplifier | |
| CN1039865C (en) | High-frequency receiver | |
| DE102006035663A1 (en) | Circuit arrangement for e.g. mobile telephone, has regulation unit coupled with signal processing unit to provide digital regulation signal for regulation of analog output signal depending on analog output signal and ramp signal | |
| CA1212420A (en) | System for processing audio frequency information for frequency modulation | |
| CN1268808A (en) | Control device | |
| CN1767401A (en) | Intermodulation distortion improving device and method for wide area communication terminal | |
| CN1306487C (en) | Slice level control circuit | |
| US6324229B1 (en) | Self-clocking automatic digital level control method and apparatus | |
| US4255724A (en) | Distortion-corrector for microwave tubes | |
| CN1135835C (en) | Four-phase shift keying modulated signal receiving assembly | |
| EP2120335A1 (en) | Power voltage forming device and polar modulation transmission device | |
| CN100352272C (en) | Method and apparatus for providing dual automatic gain control delay settings in a television receiver | |
| CN101356726A (en) | High harmonic suppressing circuit | |
| Jovanović et al. | Peak Windowing for Crest Factor Reduction Improved by Signal Interpolation | |
| CA1179736A (en) | Radio transmitter modulation control circuitry | |
| CN1723670A (en) | AGC circuit arrangement for a tuner | |
| CN213243933U (en) | Audio amplifier |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080430 Termination date: 20100413 |