CN1204898A - Apparatus with reduced A/D dynamic range requirement in compensating feedback system - Google Patents
Apparatus with reduced A/D dynamic range requirement in compensating feedback system Download PDFInfo
- Publication number
- CN1204898A CN1204898A CN 98115187 CN98115187A CN1204898A CN 1204898 A CN1204898 A CN 1204898A CN 98115187 CN98115187 CN 98115187 CN 98115187 A CN98115187 A CN 98115187A CN 1204898 A CN1204898 A CN 1204898A
- Authority
- CN
- China
- Prior art keywords
- signal
- amplifier
- source
- input
- feedback path
- 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.)
- Pending
Links
Images
Landscapes
- Amplifiers (AREA)
Abstract
An apparatus for compensating signal distortion via use of a feedback path, with reduced analog to digital conversion capacity requirements. In one embodiment, the apparatus is part of a transmission system which has an analog amplifier that distorts an information signal. Prior to the amplification, the information signal is provided in a digital format, processed digitally, and converted to analog for input to the amplifier. A sample signal is coupled off of output of the amplifier and applied along the feedback path. An analog-to-digital converter is located along the feedback path. A pre-distortion corrector is at the end of the feedback path. The pre-distortion corrector operates upon the source information using feedback data indicative of the amplifier distortion. Specifically, the information signal is pre-distorted (prior to input to the amplifier) to compensate for the distortion of the amplifier. A summation device is located along the feedback path, upstream of the analog-to-digital converter.
Description
The device that in the Compensation Feedback system, has the A/D dynamic range requirement of reduction
The present invention relates generally to data communication system, and is specifically related to be used for the feedback fraction in the system of the distortion that masking amplifier produces.
Various data communication systems need the amplification message signal.Generally speaking, inter-area traffic interarea produces with number format or provides, and is converted into analog signal.Analog signal offers high power amplifier as input then.Amplifier makes distorted signals.
A kind of method of masking amplifier distortion effect is before signal is offered amplifier as input signal to be carried out predistortion.For signal is carried out predistortion, the output of pair amplifier is sampled, and accurately whether the signal of determining predistortion the distortion effect of compensated amplifier, and if necessary, regulates predistortion, so that improve compensation.Be coupled a feedback line from amplifier, so that carry sampling along feedback path.
At the feedback path end device is arranged, be used to carry out determine and adjusting relevant with predistortion.Be somebody's turn to do definite/adjusting device with number format work.So, feedback sample signal from analog form (as at amplifier out) is converted to number format.Analogue-to-digital converters are positioned on the feedback path to finish conversion.Analogue-to-digital converters must have enough big bandwidth and dynamic range, to adapt to the feasible not obliterated data of the signal that is input to analogue-to-digital converters.
The present invention includes the device of the distortion that a kind of amplifier that is used for compensating at data communication system produces, this system provides a kind of digital signal based on the source that comprises the source information data, and will be converted to analog format to be input to amplifier from number format based on the signal in source, this amplifier provides the analog output signal that comprises based on the part in source and amplifier distortion part, and described device comprises: the output signal that is used for pair amplifier is sampled and is used for providing along feedback path the sampler device of the sampled signal of indication output signal; The signal from analog format conversion that is used for input that is positioned on the feedback path is the converter apparatus of number format; The adjuster device that utilizes the feedback data of amplifier distortion part of indication amplifier output signal that source information is operated of being used at the feedback path end; And be arranged in being used on the feedback path of described converter apparatus upstream and remove based on the part in source and the sampled signal that will only comprise the amplifier distortion part from sampled signal and to offer described converter apparatus so that be transformed into the remover device of number format.
Be that this system provides a kind of digital signal based on the source that comprises the source information data easily.This system will be converted to analog format so that be input to the amplifier from number format based on the signal in source.Amplifier provides the analog output signal that comprises based on the part and the amplifier distortion part in source.This device comprises that the output signal that is used for pair amplifier is sampled and the sampler device of the sampled signal of indication output signal is provided along feedback path.
Advantageously, the converter apparatus that is positioned on the feedback path is a number format with the signal from analog format conversion of importing.The amplifier distortion feedback data partly that is in the adjuster device utilization indication amplifier output signal of feedback path end is operated source information.Being arranged in remover device on the feedback path of converter apparatus upstream removes based on the part in source and the sampled signal that will only comprise the amplifier distortion part from sampled signal and offers converter apparatus so that be converted to number format.
At the reference accompanying drawing the present invention is described by way of example down.
Fig. 1 is a kind of schematic representation of apparatus; And
Fig. 2 is the schematic diagram that is used for information signal is carried out the exemplary device of predistortion in the device shown in Figure 1.
Fig. 1 illustrates the device 10 that adopts feedback path that distorted signals is compensated of passing through of analog-digital conversion capacity requirement with reduction.Provide information signal from data signal source 2 to device 10 with number format.Source 2 can be any suitable source, such as the part of high definition TV (HDTV) transmitter system.
The HDTV system has big data rate, and has high mistake and avoid/removing measure.In preferred forms, device 10 according to the present invention is parts of the scheme of being directed to mistake and avoiding in the HDTV system/removing measure.Hereinafter, suitably under the situation, device 10 is discussed under the environment of HDTV system, to help explanation the present invention.
In device 10,12 provide information signal to predistortion correction device 14 from the source.14 work of predistortion correction device are so that carry out predistortion to information signal, and its purpose is described as follows.Information signal after the predistortion is offered digital-analog convertor (DAC) 16, so that be converted to analog format.Now, the predistortion information signal of simulation process low pass filter 18 is to remove the false signal component.
The up converter 20 that information signal (simulation, through signal filtering, predistortion) is driven by local oscillator 22 increases frequently.After increasing frequently, information signal (after increasing frequently, simulation etc.) is offered the transmitter 24 of HDTV system.In transmitter 24,26 pairs of information signals of high power amplifier amplify, and the signal after will amplifying offers antenna 28 so that from its broadcast transmission.
The unwanted consequence that produces as amplifier 26 internal information signal processing and amplifying is that signal is by amplifier 26 distortions.The pre-distortion compensated that is undertaken by 14 pairs of information signals of predistortion correction device the distortion that causes of amplifier 26.In order to determine to be applied to the predistortion on the information signal, and in order to monitor the effect of predistortion, be coupled an analog sampling signal by device 30 and be provided on the line that limits feedback path at the output of amplifier 26.
Along feedback path, down converter 32 frequency reducings that sampled signal is driven by the same local oscillator 22 that drives up converter 20.On this aspect of feedback path (that is, the output of down converter 32), the feedback sample signal is simulated, and comprises the distorted portion that predistortion information part and amplifier cause.The output of down converter 32 is connected to the first input end 34 of summing unit 36.First input end 34 is subtraction inputs, and the feedback sample signal offers addition function piece in the summing unit 36 as negative quantity.
Continuation is along feedback path, and the output 38 of summing unit 36 offers analogue-to-digital converters (ADC) 40, and it is converted to number format with input signal.The output of analogue-to-digital converters 40 is digital format signals, and this signal offers predistortion correction device 14.In predistortion correction device 14, the digital format signal that analogue-to-digital converters 40 are provided is analyzed, determine whether the distortion that compensated amplifier causes.
The predistortion correction device 14 of this device is on data flow.Predistortion to the follow-up input information signal in source 2 is to carry out on the basis of determining (being the validity of the predistortion of previous information signal) that the relevant distortion that the amplifier of previous information signal is caused compensates.
The system with sizable bit-rate resemble HDTV must have the parts that can handle bit rate.Specifically, in order to adapt to amplifier 26 caused distortions effectively, analogue-to-digital converters 40 must be able to adapt to bandwidth and the dynamic range that is input to signal wherein.
For bandwidth and the area requirement that reduces analogue-to-digital converters 40, summing unit 36 is removed the predistortion information part of feedback sample signal.Specifically, between second positive input 46 of the output (promptly being coupled out) of low pass filter 18 and summing unit 36, be connected a variable delay device 44, make second input that information signal is provided to summing unit from data flow.This deferred mount 44 is with information signal " maintenance " a period of time, and deferred mount is provided to summing unit 36 with information signal then.
Be added to time delay on the information signal signal that provides on second positive input 46 of summing unit 36 is provided, for message part contained between two signals that provided, with the feedback sample signal " synchronously " that on the first subtraction input 34 of summing unit, provides.The feedback sample signal that is provided to summing unit 36 is the amplifier distortion version that offers the information signal of summing unit simultaneously.The time delay that deferred mount 44 is applied is variable, changes to adapt to the time that increases in frequency, amplification and the down conversion process.
In summing unit 36, with two inputs " addition " (that is, " negative quantity " sampled signal being added on the information signal).So, from sampled signal, removed the source data part, and the remainder (part that promptly contains amplifier 26 caused distortions) of sampled signal be provided at output 38.In illustrated execution mode, the remainder signal that provides at output 38 is a negative quantity.Is useful (for example being used for comparison through subtraction) with output 38 as the downstream that negative quantity is provided at predistortion correction device 14.It should be understood that and to adopt dissimilar summing unit 36 make from sampled signal, to deduct information signal, and output 38 will have positive quantity.
In analogue-to-digital converters 40, only the distorted portion (being caused by amplifier 26) with sampled signal is converted to number format.Do not need analogue-to-digital converters 40 to have a bandwidth and dynamic range not only to change the source data signals but also the switching amplifier 26 caused distortions of predistortion.So, " size " of analogue-to-digital converters 40 be chosen as only adapt to the distorted portion that the amplifier in the feedback sample signal causes, and analogue-to-digital converters 40 do not have the additional capabilities of the conversion of the predistortion information part of handling in the feedback sample signal.
Each examples of members is shown in Fig. 2 in the predistortion correction device 14.These predistortion correction device 14 examples comprise a reality along data flow-multiple transducer 50, a summing unit 52 and a multiple-real-turn parallel operation 54.On feedback path, predistortion correction device 14 comprises a reality-multiple transducer 56 and adaptive line correcting algorithm piece 58.The operation of summing unit 52 and correcting algorithm piece 58 is carried out in complex field (I and Q).
Real-multiple transducer 50 is provided to summing unit 52 with first input, and also input information is provided to correcting algorithm piece 58.In correcting algorithm piece 58, the distortion that pair amplifier 26 causes is analyzed, and suitable corrected value is provided.In a preferred forms of correcting algorithm piece 58, a look-up table is provided, it comprises corrected value, and selects corrected value from this table.Suitable corrected value is provided to summing unit 52 as second input.From summing unit information signal 52 output calibrations or predistortion.
Described a kind ofly by adopting feedback path to be used for the device of compensating signal distortion, it has the analog-digital conversion Capability Requirement of reduction.In one embodiment, this device is a part that has the emission system of the analogue amplifier of information signal distortion.Before amplifying, provide information signal with number format, and be converted into analog format and be input to amplifier through digitized processing.Be coupled a sampled signal from the output of amplifier, and provide along feedback path.Analogue-to-digital converters are positioned on the feedback path.The predistortion correction device is positioned at the feedback path end.The feedback data of predistortion correction device utilization indication amplifier distortion is operated source information.Information signal is carried out predistortion, with the distortion of compensated amplifier.Summing unit is positioned on the feedback path, is in the upstream of analogue-to-digital converters.
Claims (8)
- Claims1. the device of the distortion that produces of an amplifier that is used for compensating at data communication system, this system provides a kind of digital signal based on the source that comprises the source information data, and will be converted to analog format to be input to amplifier from number format based on the signal in source, this amplifier provides the analog output signal that comprises based on the part in source and amplifier distortion part, and described device comprises: the output signal that is used for pair amplifier is sampled and is used for providing along feedback path the sampler device of the sampled signal of indication output signal; The signal from analog format conversion that is used for input that is positioned on the feedback path is the converter apparatus of number format; The adjuster device that utilizes the feedback data of amplifier distortion part of indication amplifier output signal that source information is operated of being used at the feedback path end; And be arranged in being used on the feedback path of described converter apparatus upstream and remove based on the part in source and the sampled signal that will only comprise the amplifier distortion part from sampled signal and to offer described converter apparatus so that be transformed into the remover device of number format.
- 2. according to the device of claim 1, wherein said remover device comprises the device of two inputs of a kind of reception, first input is to comprise based on the part in source and the sampled signal of amplifier distortion part, second input is based on the signal in source, and described device comprises the device that is used for deducting from an input another input.
- 3. according to the device of claim 2, comprise the signalling that is used for providing second input based on the source to described device, wherein said signalling based on the source comprises the device that the data flow with the amplifier upstream is coupled.
- 4. according to the device of claim 3, wherein said signalling based on the source comprises the deferred mount that is used for based on signal delay a period of time in source.
- 5. according to the device of claim 4, wherein said deferred mount comprises and is used for device that the signal based on the source is postponed, makes the sampled signal that provides with importing as first of described device based on the signal in source that provides as second input of described device with respect to message part contained in the signal that is provided at two and corresponding.
- 6. according to the device of claim 5, wherein the sampled signal that provides as first input of described device is the amplifier distortion version based on the signal in source that provides simultaneously as second input of described device.
- 7. according to each device in the claim 2 to 6, wherein said device is a summation device.
- 8. according to each device in the claim 1 to 7, wherein said converter apparatus has to be enough to adapt to the sampled signal that only comprises the amplifier distortion part and to be not enough to adapt to the transfer capability that comprises based on the sampled signal of the part of information and amplifier distortion part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98115187 CN1204898A (en) | 1997-06-30 | 1998-06-29 | Apparatus with reduced A/D dynamic range requirement in compensating feedback system |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US885,373 | 1997-06-30 | ||
| CN 98115187 CN1204898A (en) | 1997-06-30 | 1998-06-29 | Apparatus with reduced A/D dynamic range requirement in compensating feedback system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1204898A true CN1204898A (en) | 1999-01-13 |
Family
ID=5224451
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98115187 Pending CN1204898A (en) | 1997-06-30 | 1998-06-29 | Apparatus with reduced A/D dynamic range requirement in compensating feedback system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1204898A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008116402A1 (en) * | 2007-03-27 | 2008-10-02 | Huawei Technologies Co., Ltd. | The predistortion apparatus, transmitter and the method |
| CN101036289B (en) * | 2004-09-21 | 2010-05-26 | 艾利森电话股份有限公司 | Analog predistorter and its regulation method and method for compensating signal change |
| CN101473530B (en) * | 2006-04-24 | 2011-11-09 | 索尼爱立信移动通讯股份有限公司 | Adaptive pre-distortion |
| CN103858397A (en) * | 2013-12-26 | 2014-06-11 | 华为技术有限公司 | Predistortion feedback method, apparatus and system |
| CN105556860A (en) * | 2013-08-09 | 2016-05-04 | 库姆网络公司 | Systems and methods for non-linear digital self-interference cancellation |
| US10103774B1 (en) | 2017-03-27 | 2018-10-16 | Kumu Networks, Inc. | Systems and methods for intelligently-tuned digital self-interference cancellation |
| US10425115B2 (en) | 2018-02-27 | 2019-09-24 | Kumu Networks, Inc. | Systems and methods for configurable hybrid self-interference cancellation |
| US10541840B2 (en) | 2015-12-16 | 2020-01-21 | Kumu Networks, Inc. | Systems and methods for adaptively-tuned digital self-interference cancellation |
| US10868661B2 (en) | 2019-03-14 | 2020-12-15 | Kumu Networks, Inc. | Systems and methods for efficiently-transformed digital self-interference cancellation |
| CN112235686A (en) * | 2019-07-15 | 2021-01-15 | 瑞昱半导体股份有限公司 | Sound effect coding and decoding circuit and audio data processing method |
-
1998
- 1998-06-29 CN CN 98115187 patent/CN1204898A/en active Pending
Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101036289B (en) * | 2004-09-21 | 2010-05-26 | 艾利森电话股份有限公司 | Analog predistorter and its regulation method and method for compensating signal change |
| CN101473530B (en) * | 2006-04-24 | 2011-11-09 | 索尼爱立信移动通讯股份有限公司 | Adaptive pre-distortion |
| WO2008116402A1 (en) * | 2007-03-27 | 2008-10-02 | Huawei Technologies Co., Ltd. | The predistortion apparatus, transmitter and the method |
| CN105556860A (en) * | 2013-08-09 | 2016-05-04 | 库姆网络公司 | Systems and methods for non-linear digital self-interference cancellation |
| CN105556860B (en) * | 2013-08-09 | 2018-04-03 | 库姆网络公司 | The system and method eliminated for non-linear, digital self-interference |
| US10050659B2 (en) | 2013-08-09 | 2018-08-14 | Kumu Networks, Inc. | Systems and methods for non-linear digital self-interference cancellation |
| CN103858397A (en) * | 2013-12-26 | 2014-06-11 | 华为技术有限公司 | Predistortion feedback method, apparatus and system |
| WO2015096096A1 (en) * | 2013-12-26 | 2015-07-02 | 华为技术有限公司 | Pre-distortion feedback method, device and system |
| CN103858397B (en) * | 2013-12-26 | 2016-09-28 | 华为技术有限公司 | A kind of predistortion feedback method, Apparatus and system |
| US10541840B2 (en) | 2015-12-16 | 2020-01-21 | Kumu Networks, Inc. | Systems and methods for adaptively-tuned digital self-interference cancellation |
| US10382089B2 (en) | 2017-03-27 | 2019-08-13 | Kumu Networks, Inc. | Systems and methods for intelligently-tuned digital self-interference cancellation |
| US10103774B1 (en) | 2017-03-27 | 2018-10-16 | Kumu Networks, Inc. | Systems and methods for intelligently-tuned digital self-interference cancellation |
| US10547346B2 (en) | 2017-03-27 | 2020-01-28 | Kumu Networks, Inc. | Systems and methods for intelligently-tuned digital self-interference cancellation |
| US10840968B2 (en) | 2017-03-27 | 2020-11-17 | Kumu Networks, Inc. | Systems and methods for intelligently-tuned digital self-interference cancellation |
| US11121737B2 (en) | 2017-03-27 | 2021-09-14 | Kumu Networks, Inc. | Systems and methods for intelligently-tuned digital self-interference cancellation |
| US10425115B2 (en) | 2018-02-27 | 2019-09-24 | Kumu Networks, Inc. | Systems and methods for configurable hybrid self-interference cancellation |
| US10804943B2 (en) | 2018-02-27 | 2020-10-13 | Kumu Networks, Inc. | Systems and methods for configurable hybrid self-interference cancellation |
| US11128329B2 (en) | 2018-02-27 | 2021-09-21 | Kumu Networks, Inc. | Systems and methods for configurable hybrid self-interference cancellation |
| US10868661B2 (en) | 2019-03-14 | 2020-12-15 | Kumu Networks, Inc. | Systems and methods for efficiently-transformed digital self-interference cancellation |
| US11562045B2 (en) | 2019-03-14 | 2023-01-24 | Kumu Networks, Inc. | Systems and methods for efficiently-transformed digital self-interference cancellation |
| CN112235686A (en) * | 2019-07-15 | 2021-01-15 | 瑞昱半导体股份有限公司 | Sound effect coding and decoding circuit and audio data processing method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2513289B2 (en) | Modulator | |
| US6175270B1 (en) | Method and apparatus for tailored distortion of a signal prior to amplification to reduce clipping | |
| US8446219B2 (en) | Class-G line driver control signal | |
| CN1204898A (en) | Apparatus with reduced A/D dynamic range requirement in compensating feedback system | |
| US20040142667A1 (en) | Method of correcting distortion in a power amplifier | |
| AU742469B2 (en) | Apparatus with reduced A/D dynamic range requirement in a compensating feedback system | |
| HK1036530A1 (en) | D.C. offset correction in digital-to-analog converters comparing input signals with output signals thereof. | |
| US6501805B1 (en) | Broadcast transmission system with single correction filter for correcting linear and non-linear distortion | |
| EP2355336B1 (en) | Distortion Compensating Apparatus, Transmitting Apparatus, and Distortion Compensating Method | |
| US20030118126A1 (en) | Apparatus and method for compensating error for analog quadrature modulator (AQM) | |
| AU708353B2 (en) | Method and apparatus for conditioning modulated signals using window expansion | |
| EP1345319A3 (en) | Method and system for reducing non-linearities | |
| US7123890B2 (en) | Signal sample acquisition techniques | |
| JP2001358784A (en) | Adaptive compensation circuit and compensation method for carrier signal phase distortion | |
| US10277261B2 (en) | Distortion compensation apparatus and distortion compensation method | |
| CA2720162C (en) | Feedforward linearization of rf power amplifiers | |
| US20040180634A1 (en) | Signal sample acquisition techniques | |
| CN1539199A (en) | Methods and apparatus for signal distortion correction | |
| US20060279357A1 (en) | Low distortion class-D amplifier using sampling of a servo-loop amplifier output | |
| US6919764B2 (en) | Amplifier control system with statistical enhancement of resolution of digital control signals | |
| US7251464B2 (en) | Method and apparatus for predistortion training in an amplifier utilizing predistortion | |
| CN1237710C (en) | Pre-distortion using by-pass signal | |
| US6751268B1 (en) | Bandpass predistorting expansion method and apparatus for digital radio transmission | |
| GB2376581A (en) | An adaptive predistortion or feedforward arrangement for an RF amplifier | |
| CN118138156A (en) | Power amplifier power correction system and method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |