CN202043077U - DPD Feedback path shared by multi-standard system - Google Patents
DPD Feedback path shared by multi-standard system Download PDFInfo
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- CN202043077U CN202043077U CN201120066181XU CN201120066181U CN202043077U CN 202043077 U CN202043077 U CN 202043077U CN 201120066181X U CN201120066181X U CN 201120066181XU CN 201120066181 U CN201120066181 U CN 201120066181U CN 202043077 U CN202043077 U CN 202043077U
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Abstract
The utility model discloses a DPD (Digital Pre-Distortion) feedback path shared by a multi-standard system, the DPD feedback path comprises a frequency mixer, a first wave filter, and a feedback analog-to-digital converter, radio-frequency signals via coupling are sent into the frequency mixer, the other end of the frequency mixer is connected with the first wave filter, the other end of the first wave filter is connected with the feedback analog-to-digital converter, and the feedback analog-to-digital converter outputs feedback data signals, wherein, the radio-frequency signals via coupling successively go through several radio frequency filters and a radiofrequency signal selective switch, and are sent into the frequency mixer; the radiofrequency signal selective switch is controlled by channel selection signals of the system; the frequency mixer is also connected with a feedback radio frequency phase lock source controlled by the channel selection signals; the feedback phase lock source provides local oscillator signals for the frequency mixer; and feedback data signals are obtained via signals outputted by the frequency mixer successively going through the first wave filter and the feedback analog-to-digital converter. The DPD feedback path in the utility model is advantaged by reducing board arrangement area of the system, and saving cost.
Description
Technical field
The utility model relates to moving communicating field, is specifically related to the shared DPD feedback network of a kind of multi-modulation scheme system.
Background technology
In many wireless communication systems, for sufficiently high power output being provided and realizing maximum output, power amplifier usually be operated in the inelastic region in addition be operated in the saturation region near, this moment, power amplifier presented very strong nonlinear characteristic.Because non-constant envelope signal, the linearity to power amplifier is very responsive, when being non-constant envelope signal (as M-QAM or QPSK), the input signal of power amplifier will produce very serious intermodulation distortion, thereby make the power amplifier output signal spread spectrum, produce interference adjacent channel.In the existing and future mobile communication system, the requirement of adjacent-channel interference is strict.Usually the own tonal signal that requires base station power amplifier output should be lower than-40dB at the radiant power of the side channel ratio with power demand, promptly compares with in-band signal power, be with outer transmitting power should less than-60dB～-40dB.DPD (Digital Pre-Distortion, digital pre-distortion technology) solves the technology of power amplifier linearization problem just, and it not only can make power amplifier work in the linear work district as far as possible, and can guarantee that power amplifier has higher service efficiency.
In order to make self adaptation adjustment that predistorter can be in good time and then the nonlinear distortion that allows the full remuneration of output energy produce, it needs a feedback path that the signal of power amplifier output is sent back to predistortion processor as pre-distortion parameters, feedback path with reference to 1, one standard of figure comprises: frequency mixer 101, first filter 102, feedback modulus transducer 103 and these interelement interface channels.Each standard all needs a feedback path in the multi-modulation scheme system, not only increases cost like this in the multi-modulation scheme system, also can take more board area.If each downlink passage of each standard all is provided with a feedback path, can use a plurality of local oscillators, a plurality of frequency mixers, a plurality of ADC (analog-to-digital convertor, analog to digital converter) or the like, increased like this and used the quantity of device, thereby taken the area of more circuit board, hardware cost is also than higher.
The utility model content
The utility model discloses the shared DPD feedback network of a kind of multi-modulation scheme system, can reduce the fabric swatch area of circuit board in the multi-modulation scheme system, save cost.
The shared DPD feedback network of a kind of multi-modulation scheme system, frequency mixer, first filter and feedback modulus transducer are arranged, radiofrequency signal after coupling is sent into described frequency mixer, the other end of described frequency mixer connects described first filter, the other end of described first filter connects described feedback modulus transducer, described feedback modulus transducer output feedback digital signal, wherein
Radiofrequency signal after coupling is sent into described frequency mixer (A4) by some radio-frequency filters and radiofrequency signal selector switch (A2) successively; The corresponding radio-frequency filter of a kind of radiofrequency signal of standard; Described radiofrequency signal selector switch (A2) is by the channel selecting signal control of system;
Described frequency mixer (A4) also is connected with the feedback radio frequency phase locked source of being controlled by described channel selecting signal (A3); Described feedback radio frequency phase locked source (A3) provides local oscillation signal for described frequency mixer (A4);
After passing through described first filter A5 and described feedback modulus transducer (A6) successively, the signal of described frequency mixer (A4) output obtains feedback digital signal.
Because use the purpose of feedback signal to provide pre-distortion parameters, reponse system provides the time of pre-distortion parameters generally just can finish in a few tens of milliseconds, and the cycle that needs to upgrade a pre-distortion module was generally several seconds, and this just means that can carry out repeatedly pre-distortion parameters in one-period upgrades.If can a plurality of feedback signals send into the pre-distortion module simultaneously when a plurality of DPD processing modules need be upgraded pre-distortion parameters, and only need these feedback signal timesharing to send into the pre-distortion module just passable.So use the single physical passage, by the channel selecting signal control radiofrequency signal selector switch of system, the feedback signal different systems of timesharing is sent into the pre-distortion module and can be reached equally and upgrade the purpose of pre-distortion parameters separately.Before the radiofrequency signal selector switch, add the radio-frequency filter corresponding, prevent the interference between various standard signals with the signal of each standard; The local oscillation signal of frequency mixer is produced by channel selecting signal control radio frequency phase locked source, when selecting certain standard signal, the output frequency of corresponding modify feedback radio frequency phase locked source just can change to intermediate frequency to the signal of this standard, use this feedback network, significantly reduce the fabric swatch area of multi-modulation scheme system, saved cost.
Description of drawings
Fig. 1 is that the digital pre-distortion of a kind of standard in the prior art is handled structure chart;
Fig. 2 is a feedback network structure chart of the present utility model;
Fig. 3 is that the digital pre-distortion that the utility model is applied in the multi-modulation scheme system is handled structure chart.
Embodiment
The utility model utilizes the characteristic of the handy DPD algorithm of shared DPD feedback network technology, by the method for time-sharing multiplex, provides a feedback path to allow the shared based on feedback link of a plurality of downgoing reflection passages to reach the purpose of saving cost and reducing the fabric swatch area.For conveniently understanding the utility model, describe below in conjunction with accompanying drawing.
The utility model discloses the shared DPD feedback network of a kind of multi-modulation scheme system, with reference to figure 2, include: radio-frequency filter (A11, A12......A1n); Radiofrequency signal selector switch A2; Feedback radio frequency phase locked source A3; Frequency mixer A4; The first filter A5; Feedback modulus transducer A6; Wherein the feedback signal of n kind standard is sent into radiofrequency signal selector switch A2 by radio-frequency filter; The feedback signal of every kind of standard is corresponding to a filter, and the feedback signal of standard 1 is by radio-frequency filter A11, and the feedback signal of standard 2 is passed through radio-frequency filter Aln by the feedback signal of radio-frequency filter A12...... standard n; Control the feedback signal that this radiofrequency signal selector switch A2 selects any standard by the channel selecting signal of system; The signal of this radiofrequency signal selector switch A2 output is sent into frequency mixer A4, and the local oscillation signal of this frequency mixer A4 is that the channel selecting signal Control and Feedback radio frequency phase locked source A3 by system produces; The signal of this frequency mixer A4 output is sent into feedback modulus transducer A6 through the first filter A5, and this feedback modulus transducer A6 exports feedback digital signal.
Because use the purpose of feedback signal to provide pre-distortion parameters, reponse system provides the time of pre-distortion parameters generally just can finish in a few tens of milliseconds, and the cycle that needs to upgrade a pre-distortion module was generally several seconds, and this just means that can carry out repeatedly pre-distortion parameters in one-period upgrades.If can a plurality of feedback signals send into the pre-distortion module simultaneously when a plurality of DPD processing modules need be upgraded pre-distortion parameters, and only need these feedback signal timesharing to send into the pre-distortion module just passable.So use the single physical passage, by the channel selecting signal control radiofrequency signal selector switch of system, the feedback signal different systems of timesharing is sent into the pre-distortion module and can be reached equally and upgrade the purpose of pre-distortion parameters separately.Before the radiofrequency signal selector switch, add the radio-frequency filter corresponding, prevent the interference between various standard signals with the signal of each standard; The local oscillation signal of frequency mixer is produced by channel selecting signal control radio frequency phase locked source, when selecting certain standard signal, the output frequency of corresponding modify feedback radio frequency phase locked source just can change to intermediate frequency to the signal of this standard, use this feedback network, significantly reduce the fabric swatch area of multi-modulation scheme system, saved cost.
Preferably, the first filter A5 is a frequency overlapped-resistable filter, can improve the noise resisting ability of system.
The digital pre-distortion that Fig. 3 the utility model is applied in the multi-modulation scheme system is handled structure chart, comprise: integrated pre-distortion cell S 1 is FPGA, comprises several predistortion module (pre-distortion module S11, pre-distortion module S12...... pre-distortion module S1n); A kind of baseband signal of standard enters a pre-distortion module, and here, standard 1 baseband signal enters pre-distortion module S11, and standard 2 baseband signals enter pre-distortion module S12...... standard n baseband signal and enter pre-distortion module S1n; From 2 kinds of signals of FPGA output, a kind of is channel selecting signal, and this channel selecting signal is admitted to feedback path S5, and another kind of signal is imported corresponding DAC (digital-to-analogconvertor respectively, digital to analog converter), comprising: DAC (S21), DAC (S22) ... DAC (S2n); Being introduced corresponding radio frequency downlink respectively from the signal of this digital to analog converter output comprises: radio frequency downlink S31, radio frequency downlink S32...... radio frequency downlink S3n; Be introduced into PA (power amplifier, power amplifier) from the signal of radio frequency downlink output, comprise: PA (S41), PA (S42) ... PA (S4n); Radio frequency output signal after power amplifier amplifies, a part is coupled back feedback path S5; Channel selecting signal is controlled this feedback path S5 and need to be selected coupled signal of handling and the local oscillation signal that disposes feedback path, handle the output feedback digital signal through feedback path S5, this feedback digital signal is drawn back integrated pre-distortion cell S 1 and is carried out pre-distortion.
Above-described the utility model execution mode does not constitute the qualification to the utility model protection range.Any modification of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the claim protection range of the present utility model.
Claims (2)
1. shared DPD feedback network of multi-modulation scheme system, comprise: frequency mixer, first filter and feedback modulus transducer, radiofrequency signal after coupling is sent into described frequency mixer, the other end of described frequency mixer connects described first filter, the other end of described first filter connects described feedback modulus transducer, described feedback modulus transducer output feedback digital signal is characterized in that
Radiofrequency signal after coupling is sent into described frequency mixer (A4) by some radio-frequency filters and radiofrequency signal selector switch (A2) successively; The corresponding radio-frequency filter of a kind of radiofrequency signal of standard; Described radiofrequency signal selector switch (A2) is by the channel selecting signal control of system;
Described frequency mixer (A4) also is connected with the feedback radio frequency phase locked source of being controlled by described channel selecting signal (A3); Described feedback radio frequency phase locked source (A3) provides local oscillation signal for described frequency mixer (A4);
After passing through described first filter (A5) and described feedback modulus transducer (A6) successively, the signal of described frequency mixer (A4) output obtains feedback digital signal.
2. the shared DPD feedback network of multi-modulation scheme system according to claim 1, it is characterized in that: described first filter is a frequency overlapped-resistable filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120066181XU CN202043077U (en) | 2011-03-14 | 2011-03-14 | DPD Feedback path shared by multi-standard system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201120066181XU CN202043077U (en) | 2011-03-14 | 2011-03-14 | DPD Feedback path shared by multi-standard system |
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| CN202043077U true CN202043077U (en) | 2011-11-16 |
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| CN201120066181XU Expired - Fee Related CN202043077U (en) | 2011-03-14 | 2011-03-14 | DPD Feedback path shared by multi-standard system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104901638A (en) * | 2015-06-03 | 2015-09-09 | 京信通信技术(广州)有限公司 | Multichannel digital pre-distortion (DPD) power amplifying system |
| CN107241072A (en) * | 2017-05-03 | 2017-10-10 | 京信通信技术(广州)有限公司 | Power amplifier device and method |
-
2011
- 2011-03-14 CN CN201120066181XU patent/CN202043077U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104901638A (en) * | 2015-06-03 | 2015-09-09 | 京信通信技术(广州)有限公司 | Multichannel digital pre-distortion (DPD) power amplifying system |
| CN104901638B (en) * | 2015-06-03 | 2018-01-09 | 京信通信技术(广州)有限公司 | Multichannel digital predistortion DPD power amplification systems |
| CN107241072A (en) * | 2017-05-03 | 2017-10-10 | 京信通信技术(广州)有限公司 | Power amplifier device and method |
| CN107241072B (en) * | 2017-05-03 | 2020-11-06 | 京信通信***（中国）有限公司 | Power amplifying device and method |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| 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: 20111116 Termination date: 20170314 |