CN1799202A - Method and system for continuously compensating for phase variations introduced into a communication signal by automatic gain control adjustments - Google Patents
Method and system for continuously compensating for phase variations introduced into a communication signal by automatic gain control adjustments Download PDFInfo
- Publication number
- CN1799202A CN1799202A CN 200480015339 CN200480015339A CN1799202A CN 1799202 A CN1799202 A CN 1799202A CN 200480015339 CN200480015339 CN 200480015339 CN 200480015339 A CN200480015339 A CN 200480015339A CN 1799202 A CN1799202 A CN 1799202A
- Authority
- CN
- China
- Prior art keywords
- signal
- signal component
- compensating module
- gain control
- phase
- 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
Abstract
A communication system (100) including an automatic control (AGC) circuit (105), a receiver (110), an analog to digital (ADC) converter (115) and an insertion phase variation compensation module (120). The AGC circuit receives and amplifies communication signals (150). The gain of the AGC circuit is adjusted. The AGC circuit outputsan amplified signal (145) to the receiver which, in turn, outputs an analog complex signal to the ADC (115). The ADC outputs a digital complex signal to the insertion phase variation compensation module (120) which counteracts the effects of phase offsets introduced into the communication signal due to the continuous gain adjustments associated with the AGC circuit.
Description
Technical field
The relevant wireless communication system that the present invention is total.Say that more specifically the present invention is about a kind of Digital Signal Processing (DSP) technology that is used for compensating the phase variation relevant with automatic gain control (AGC) adjustment.
Background technology
In a traditional phase sensitivity communication system, a receiver uses automatic gain control (AGC) to come automatically gain to be adjusted to the function of the amplitude of a radio frequency (RF) and/or intermediate frequency (IF) signal of communication.A value of real part gain coefficient that is produced by this AGC is added to this signal of communication.In simulation field, the amplitude of signal of communication is maintained in the pre-defined signal amplitude scope and converts thereof into a digital signal by an analog-digital converter (ADC) then, and this transducer is the restricting signal amplitude range also.The purpose of AGC is that the input to ADC is maintained a firm power position standard.
When AGC was adjusted, a phase deviation got involved and makes the degradation of this phase sensitivity communication system in this signal of communication.Therefore expect that a kind of method and system is in order to offset because of adjusting the signal of communication phase deviation that this AGC causes.
Summary of the invention
The present invention is embodied in a communication system, and it comprises an agc circuit, a receiver, an analog-digital converter (ADC) and an insertion phase variation compensating module.This agc circuit receives and the amplification signal of communication.The gain of this agc circuit is adjusted continuously.This agc circuit amplifies signal of communication to this receiver output one, and this receiver is subsequently to this ADC output one simulation complex signal.This ADC exports a digital complex signal to this insertion phase variation compensating module, and this module payment gets involved the effect of the phase deviation in this signal of communication because of the continuous gain adjustment relevant with this agc circuit.This simulation complex signal and this digital complex signal comprise homophase (I) and quadrature (Q) signal component.
The gain response of this agc circuit is subjected to adjusting continuously in a gain control signal.The phase deviation estimated value is offered this insertion phase variation compensating module by the function with this gain control signal.
This insertion phase variation compensating module can receive changed number I and the Q signal component that digital I and Q signal component and output have the phase characteristic that differs from described digital I and Q signal component from this ADC.This communication system can also comprise the modulator-demodulator of a described changed number I of reception and Q signal component.This modulator-demodulator can comprise the processor of this gain control signal of generation.How much power this processor can calculate and be defeated by this ADC.
This communication system can also comprise a look-up table (LUT) of communicating by letter with this processor and this insertion phase variation compensating module.This LUT can receive this gain signal and this insertion phase variation compensating module be provided the phase deviation estimated value of a function of this gain signal from this processor.The estimated value that provides comprises a Sin function and the Cos function of a phase deviation x.This insertion phase variation compensating module can have real part (Re) input and one and one Q signal component relevant imaginary part (Im) input relevant with a digital I signal component, and according to the estimated value that is provided by this LUT, the I signal component and that this insertions phase variation compensating module exportable one has a phase place of having adjusted according to function [Cos (x) * Re]-[Sin (x) * Im] has one according to the Q signal component of the phase place of function [Sin (x) * Re]+[Cos (x) * Im] adjustment.
Description of drawings
Explanation by a following preferred embodiments of giving an example can allow the people more understand the present invention with reference to accompanying drawing, in the accompanying drawing:
Fig. 1 is a calcspar according to communication system of the present invention, and this system comprises a payment gets involved the phase deviation in the signal of communication because of an agc circuit insertion phase variation compensating module;
Fig. 2 inserts an example configuration of phase variation compensating module for Fig. 1; And
Fig. 3 is a method flow diagram, and it comprises implementation gets involved the effect of the phase deviation in the signal of communication because of the agc circuit of Fig. 1 with continuous payment step.
Embodiment
The present invention proposes a kind of payment and adjusts the method and system of getting involved the phase difference in a RF or the IF signal of communication (that is data streaming) because of carrying out AGC.
Preferable, disclosed method and system is embodied in the wireless transmitter/receiver unit (WTRU).Hereinafter, the non-limitation of a WTRU comprises user's equipment, a portable base station, a holding or portable subscriber unit, calling set or any other types of devices that can operate in a wireless environment.Feature of the present invention can be embodied in the integrated circuit (IC) or by planning and comprise in the circuit of a large amount of interconnecting assemblies one.
The present invention can be applicable to adopt time division duplex (TDD), frequency division duplexing (FDD), demal is multidirectional closely connects the communication system of (CDMA), CDMA 2000, timesharing synchronization CDMA (TDSCDMA), orthogonal frequency division multitasking (OFDM) or similar techniques.
Fig. 1 is a calcspar according to the communication system 100 of the present invention running.Communication system 100 comprises an agc circuit 105, a receiver 110, an analog-digital converter (ADC) 115, an insertion phase variation compensating module 120 and a modulator-demodulator 125.Agc circuit 105 and ADC 115 can be merged in the receiver 110.Agc circuit 105 can comprise one pass gain or multistage gain.In addition, inserting phase variation compensating module 120 can incorporate in the modulator-demodulator 125.
Modulator-demodulator 125 comprises one and calculates the processor 130 how much power is defeated by ADC 115.Modulator-demodulator 125 receives compound I and Q signal component 135,140 from inserting phase variation compensating module 120, and via 130 pairs of agc circuits of processor, 105 outputs, one gain control signal 145.Gain control signal 145 comprises one and is used for setting the gain coefficient of the amplitude of a RF and/or IF signal of communication 150 by agc circuit 105.Gain control signal 145 is also exported to a look-up table (LUT) 155 from processor 130, and this look-up table utilizes 145 pairs of gain control signals to insert phase variation compensating module 120 a phase deviation estimated value that gets involved in the signal of communication 150 is provided.Another selection can adopt a predefined multinomial or any other method to replace LUT 155 that the phase deviation estimated value is provided.
When the gain level of the gain stage of agc circuit 105 changed at every turn, a dependent phase deviation (that is phase place rotation) may get involved in the signal of communication 150.Therefore, the phase deviation estimated value (x) of a function of the gain that provided of agc circuit 105 can be judged in a continuity mode by any other method that access LUT 155, one pre-defined multinomial or the full breadth of AGC value that can be relevant with agc circuit 105 are mapped across a phase deviation estimated value.
Fig. 2 is for inserting an example configuration of phase variation compensating module 120, this module serves as that the basis rotates from the I of a digital complex signal of ADC 115 output and the phase characteristic of Q signal component, so that payment gets involved the effect of the phase deviation in the signal of communication 150 because of agc circuit 105 with gain control signal 145.Therefore, modulator-demodulator 125 is not influenced by these phase deviations, and the performance of communication system 100 can variation.Different gain level can make different gain deviations get involved in the signal of communication 150.
As shown in Figure 2, insert phase variation compensating module 120 and comprise multiplier 205,210,215,220 adders 225 and 230.Inserting phase variation compensating module 120 receives a real part (Re) I signal components 250 and imaginary part (jIm) Q signal component 260 and the phase place of signal component Re and jIm is rotated x degree (e shown in following equation 1 from ADC 115
Jx):
(Re+jIm) * e
Jx=(Re+jIm) * [Cos (x)+jSin (x)] equation 1
The result of real part output
Shown in following equation 2:
It is also noted that if x approaches zero, then Cos (x)=1.0 and Sin (x)=x, shown in following equation 3:
Equation 3
The m of as a result of imaginary part output is shown in following equation 4:
m=[Sin (x) * Re]+[Cos (x) * Im] equation 4
It is also noted that if x approaches zero, then Cos (x)=1.0 and Sin (x)=x, shown in following equation 5:
m=Im+Re * x equation 5
Therefore, shown in equation 2, real signal component 250 is taken advantage of by LUT 155 a specified Cos (x) functions 280 via multiplier 215, and imaginary signal component 260 is that LUT 155 a specified Sin (x) functions 270 are taken advantage of via multiplier 210 equally, is subtracted the output of multiplier 210 by this with the output of multiplier 215 by adder 225.In addition, shown in equation 4, real signal component 250 is taken advantage of by LUT 155 a specified Sin (x) functions 270 via multiplier 205, and imaginary signal component 260 is that LUT 155 a specified Cos (x) functions 280 are taken advantage of via multiplier 220 equally, by adder 230 output of multiplier 220 is added the output of multiplier 205 by this.
Fig. 3 is the flow chart of a method 300, and it comprises implementation gets involved the effect of the phase deviation in the signal of communication 150 that agc circuit 105 received with continuous payment step.In step 305, provide gain control signal 145 to agc circuit 105.In step 310, agc circuit 105 is in response to the gain of gain control signal 145 adjustment one signal of communication 150, and this adjustment causes a phase deviation to get involved in the signal of communication 150.In step 315, provide the phase deviation estimated value of a function of gain control signal 145 to inserting phase variation compensating module 120.In step 320, phase variation compensating module 120 serves as the phase place that signal of communication 150 is adjusted on the basis with provided estimated value.Method 300 repeats in a continuity mode.
Although use literal and description of drawings especially with reference to preferred embodiment, person skilled in the art person obviously can not break away from the above scope of the invention as can be known and make various variation with regard to form and details.
Claims (31)
1. communication system, it comprises:
(a) automatic gain control (AGC) circuit, its reception is also adjusted the gain of a signal of communication, and this AGC is controlled by a gain control signal; And
(b) one insert the phase variation compensating module, it serves as that the effect that gets involved the phase deviation in this signal of communication because of this agc circuit is offseted on the basis continuously with this gain control signal.
2. communication system as claimed in claim 1 is characterized in that also comprising:
(c) receiver, it receives this signal of communication and output analog in-phase (I) and quadrature (Q) signal component from this agc circuit; And
(d) analog-digital converter (ADC), it receives described Simulation with I and Q signal component and converts described Simulation with I and Q signal component to digital I and Q signal component.
3. communication system as claimed in claim 2, it is characterized in that this insertion phase variation compensating module receives change I and the Q signal component that described digital I and Q signal component and output have the phase characteristic that differs from described digital I and Q component from this ADC, this communication system also comprises:
(e) modulator-demodulator, it receives described change I and Q signal component, and this modulator-demodulator comprises the processor of this gain control signal of generation.
4. communication system as claimed in claim 3 is characterized in that how much power this processor calculates and be input to this ADC.
5. communication system as claimed in claim 2 is characterized in that this insertion phase variation compensating module receives described digital I and Q component and the phase characteristic of described digital I and Q component changed to a function of this gain control signal from this ADC
6. communication system as claimed in claim 1 is characterized in that also comprising:
(c) processor, it produces this gain control signal; And
(d) look-up table (LUT), it is communicated by letter with this processor and this insertion phase variation compensating module, and wherein this LUT receives this gain control signal and provides the phase deviation estimated value with the function as this gain control signal to this insertion phase variation compensating module from this processor.
7. communication system as claimed in claim 6 is characterized in that the estimated value that provides comprises a phase deviation, the Sin function of x and a Cos function.
8. communication system as claimed in claim 7, it is characterized in that this insertion phase variation compensating module has real part (Re) input and one and one quadrature (Q) signal component relevant imaginary part (Im) input relevant with digital homophase (I) signal component, and according to the estimated value that is provided by this LUT, this insertions phase variation compensating module output one has an I signal component according to the phase place of function [Cos (x) * Re]-[Sin (x) * Im] adjustment.
9. communication system as claimed in claim 7, it is characterized in that this insertion phase variation compensating module has real part input (Re) and one and one quadrature (Q) signal component relevant imaginary part input (Im) relevant with digital homophase (I) signal component, and according to by the estimated value that this LUT provided, this insertions phase variation compensating module output one has a Q signal component according to the phase place of function [Sin (x) * Re]+[Cos (x) * Im] adjustment.
10. a wireless transmitter/receiver unit (WTRU), it comprises:
(a) automatic gain control (AGC) circuit, its reception and adjust the gain of a signal of communication, this AGC is controlled by a gain control signal; And
(b) one insert the phase variation compensating module, it serves as that the effect that gets involved the phase deviation in this signal of communication because of this agc circuit is offseted on the basis continuously with this gain control signal.
11. WTRU as claimed in claim 10 is characterized in that also comprising:
(c) receiver, it receives this signal of communication and output analog in-phase (I) and quadrature (Q) signal component from this agc circuit; And
(d) analog-digital converter (ADC), it receives described Simulation with I and Q signal component and converts described Simulation with I and Q signal component to digital I and Q signal component.
12. WTRU as claimed in claim 11, it is characterized in that this insertion phase variation compensating module receives change I and the Q signal component that described digital I and Q signal component and output have the phase characteristic that differs from described digital I and Q component from this ADC, this WTRU also comprises:
(e) modulator-demodulator, it receives described change I and Q signal component, and this modulator-demodulator comprises the processor of this gain control signal of generation.
13. WTRU as claimed in claim 12 is characterized in that how much power this processor calculates and be input to this ADC.
14. WTRU as claimed in claim 11 is characterized in that this insertion phase variation compensating module receives described digital I and Q component and the phase characteristic of described digital I and Q component changed to a function of this gain control signal from this ADC
15. WTRU as claimed in claim 10 is characterized in that also comprising:
(c) processor, it produces this gain control signal; And
(d) look-up table (LUT), it is communicated by letter with this processor and this insertion phase variation compensating module, and wherein this LUT receives this gain control signal and provides the phase deviation estimated value with the function as this gain control signal to this insertion phase variation compensating module from this processor.
16. WTRU as claimed in claim 15 is characterized in that the estimated value that provides comprises a phase deviation, the Sin function of x and a Cos function.
17. WTRU as claimed in claim 16, it is characterized in that this insertion phase variation compensating module has real part (Re) input and one and one quadrature (Q) signal component relevant imaginary part (Im) input relevant with digital homophase (I) signal component, and according to by the estimated value that this LUT provided, this insertions phase variation compensating module output one has an I signal component according to the phase place of function [Cos (x) * Re]-[Sin (x) * Im] adjustment.
18. WTRU as claimed in claim 16, it is characterized in that this insertion phase variation compensating module has real part input (Re) and one and one quadrature (Q) signal component relevant imaginary part input (Im) relevant with digital homophase (I) signal component, and according to the estimated value that is provided by this LUT, this insertions phase variation compensating module output one has a Q signal component according to the phase place of function [Sin (x) * Re]+[Cos (x) * Im] adjustment.
19. an integrated circuit (IC), it comprises:
(a) automatic gain control (AGC) circuit, its reception is also adjusted the gain of a signal of communication, and this AGC is controlled by a gain control signal; And
(b) one insert the phase variation compensating module, it serves as that the effect that gets involved the phase deviation in this signal of communication because of this agc circuit is offseted on the basis continuously with this gain control signal.
20. IC as claimed in claim 19 is characterized in that also comprising:
(c) receiver, it receives this signal of communication and output analog in-phase (I) and quadrature (Q) signal component from this agc circuit; And
(d) analog-digital converter (ADC), it receives described Simulation with I and Q signal component and converts described Simulation with I and Q signal component to digital I and Q signal component.
21. IC as claimed in claim 20, it is characterized in that this insertion phase variation compensating module receives change I and the Q signal component that described digital I and Q signal component and output have the phase characteristic that differs from described digital I and Q component from this ADC, this IC also comprises:
(e) modulator-demodulator, it receives described change I and Q signal component, and this modulator-demodulator comprises the processor of this gain control signal of generation.。
22. IC as claimed in claim 21 is characterized in that how much power this processor calculates and be input to this ADC.
23. IC as claimed in claim 20 is characterized in that this insertion phase variation compensating module receives described digital I and Q component and the phase characteristic of described digital I and Q component changed to a function of this gain control signal from this ADC
24. IC as claimed in claim 19 is characterized in that also comprising:
(c) processor, it produces this gain control signal; And
(d) look-up table (LUT), it is communicated by letter with this processor and this insertion phase variation compensating module, and wherein this LUT receives this gain control signal and provides the phase deviation estimated value with the function as this gain control signal to this insertion phase variation compensating module from this processor.
25. IC as claimed in claim 24 is characterized in that the estimated value that provides comprises a phase deviation, the Sin function of x and a Cos function.
26. IC as claimed in claim 25, it is characterized in that this insertion phase variation compensating module has real part (Re) input and one and one quadrature (Q) signal component relevant imaginary part (Im) input relevant with digital homophase (I) signal component, and according to by the estimated value that this LUT provided, this insertions phase variation compensating module output one has an I signal component according to the phase place of function [Cos (x) * Re]-[sin (x) * Im] adjustment.
27. IC as claimed in claim 25, it is characterized in that this insertion phase variation compensating module has real part input (Re) and one and one quadrature (Q) signal component relevant imaginary part input (Im) relevant with digital homophase (I) signal component, and according to by the estimated value that this LUT provided, this insertions phase variation compensating module output one has a Q signal component according to the phase place of function [Sin (x) * Re]+[Cos (x) * Im] adjustment.
28. a method that is used for offseting continuously the effect that gets involved the phase deviation to the signal of communication because of this agc circuit in comprising the communication system that automatic gain control (AGC) circuit and inserts the phase variation compensating module, this method comprises:
(a) provide a gain control signal to this agc circuit;
(b) this agc circuit receive and the gain of adjusting a signal of communication to respond this gain control signal, this adjustment causes a phase deviation to get involved in this signal of communication;
(c) provide the phase deviation estimated value with a function to this insertion phase variation compensating module as this gain control signal;
(d) to provide estimated value with this institute be the phase place that this signal of communication is adjusted on the basis to this insertion phase variation compensating module; And
(e) repeating step (a)-(d).
29. method as claimed in claim 28 is characterized in that this institute provides estimated value to comprise a phase deviation, x, a Sin function and a Cos function.
30. method as claimed in claim 29, it is characterized in that this insertion phase variation compensating module has real part (Re) input and one and one quadrature (Q) signal component relevant imaginary part (Im) input relevant with digital homophase (I) signal component, and according to by the estimated value that this LUT provided, this insertions phase variation compensating module output one has an I signal component according to the phase place of function [Cos (x) * Re]-[Sin (x) * Im] adjustment.
31. method as claimed in claim 29, it is characterized in that this insertion phase variation compensating module has real part input (Re) and one and one quadrature (Q) signal component relevant imaginary part input (Im) relevant with digital homophase (I) signal component, and according to by the estimated value that this LUT provided, this insertions phase variation compensating module output one has a Q signal component according to the phase place of function [Sin (x) * Re]+[Cos (x) * Im] adjustment.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US47647103P | 2003-06-06 | 2003-06-06 | |
| US60/476,471 | 2003-06-06 | ||
| US10/736,432 | 2003-12-15 |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008101691497A Division CN101388879A (en) | 2003-06-06 | 2004-05-06 | Method and system for continuously compensating for phase variations introduced into a communication signal by automatic gain control adjustments |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1799202A true CN1799202A (en) | 2006-07-05 |
| CN100431273C CN100431273C (en) | 2008-11-05 |
Family
ID=36819260
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008101691497A Pending CN101388879A (en) | 2003-06-06 | 2004-05-06 | Method and system for continuously compensating for phase variations introduced into a communication signal by automatic gain control adjustments |
| CNB2004800153393A Expired - Fee Related CN100431273C (en) | 2003-06-06 | 2004-05-06 | Method and system for continuously compensating for phase variations introduced into a communication signal by automatic gain control adjustments |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008101691497A Pending CN101388879A (en) | 2003-06-06 | 2004-05-06 | Method and system for continuously compensating for phase variations introduced into a communication signal by automatic gain control adjustments |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN101388879A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101741455B (en) * | 2008-11-25 | 2013-06-05 | 瑞昱半导体股份有限公司 | Equalizer and method applying same |
| CN106656876A (en) * | 2015-10-28 | 2017-05-10 | 北京华大九天软件有限公司 | Continuous time linear adaptive equalizer circuit applied to SERDES receiver |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5590158A (en) * | 1993-01-28 | 1996-12-31 | Advantest Corporation | Method and apparatus for estimating PSK modulated signals |
| US5898912A (en) * | 1996-07-01 | 1999-04-27 | Motorola, Inc. | Direct current (DC) offset compensation method and apparatus |
| US6240100B1 (en) * | 1997-07-31 | 2001-05-29 | Motorola, Inc. | Cellular TDMA base station receiver with dynamic DC offset correction |
| JP3414633B2 (en) * | 1998-01-16 | 2003-06-09 | 沖電気工業株式会社 | Frequency converter |
| US6321073B1 (en) * | 2000-01-31 | 2001-11-20 | Motorola, Inc. | Radiotelephone receiver and method with improved dynamic range and DC offset correction |
-
2004
- 2004-05-06 CN CNA2008101691497A patent/CN101388879A/en active Pending
- 2004-05-06 CN CNB2004800153393A patent/CN100431273C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101741455B (en) * | 2008-11-25 | 2013-06-05 | 瑞昱半导体股份有限公司 | Equalizer and method applying same |
| CN106656876A (en) * | 2015-10-28 | 2017-05-10 | 北京华大九天软件有限公司 | Continuous time linear adaptive equalizer circuit applied to SERDES receiver |
| CN106656876B (en) * | 2015-10-28 | 2019-07-09 | 北京华大九天软件有限公司 | A kind of continuous time linear adaptive equalizer circuit applied to the receiving end SERDES |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101388879A (en) | 2009-03-18 |
| CN100431273C (en) | 2008-11-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7702288B2 (en) | Digital baseband system and process for compensating for analog radio transmitter impairments | |
| US7701371B2 (en) | Digital gain computation for automatic gain control | |
| AU2003215717A1 (en) | Electronic marker locator system and method | |
| CN1171404C (en) | High dynamic range low ripple RSSI for zero-IF or low-IF receivers | |
| JP2003283586A (en) | Transmitter | |
| WO1997014211A1 (en) | Numerical voltage controlled oscillator | |
| KR100587951B1 (en) | Apparatus and Method for AGC and I/Q Imbalance Compensation in a quadrature demodulating receiver | |
| US20120256688A1 (en) | Amplifying device and signal processing device | |
| US8792591B1 (en) | Systems and methods for I/Q imbalance correction and calibration of variable modulus signals | |
| AU2004253071B2 (en) | Method and system for continuously compensating for phase variations introduced into a communication signal by automatic gain control adjustments | |
| CN1799202A (en) | Method and system for continuously compensating for phase variations introduced into a communication signal by automatic gain control adjustments | |
| CN101263659B (en) | Reception amplitude correction circuit, reception amplitude correction method, and receiver using the same | |
| CN1765058A (en) | AM receiver and demodulator | |
| US20110116582A1 (en) | Digital automatic gain control | |
| US8224265B1 (en) | Method for optimizing AM/AM and AM/PM predistortion in a mobile terminal | |
| US20040001466A1 (en) | Phase system rotation for power estimation | |
| US20060133541A1 (en) | Insertion phase variation compensation module and method of counteracting the effect of a phase offset introduced into a received signal | |
| JP5468239B2 (en) | Portable terminal device, transmission / reception performance correction method and program thereof | |
| US10090818B1 (en) | Adaptive signal compressor for AM radio | |
| AU2007203550A1 (en) | Method and system for continuously compensating for phase variations introduced into a communication signal by automatic gain control adjustments | |
| JP2007274062A (en) | Digital prestage distortion compensator circuit of amplifier | |
| US8571141B2 (en) | Carrier recovery device and method | |
| CN116208231A (en) | Automatic gain control system and method for all-digital satellite demodulator | |
| JP2000278062A (en) | Automatic gain control circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| REG | Reference to a national code |
Ref country code: HK Ref legal event code: DE Ref document number: 1087545 Country of ref document: HK |
|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| REG | Reference to a national code |
Ref country code: HK Ref legal event code: WD Ref document number: 1087545 Country of ref document: HK |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081105 Termination date: 20170506 |