CN105376045B - It is a kind of can be to the radio frequency chip and mobile terminal that Doppler frequency shift is modified - Google Patents
It is a kind of can be to the radio frequency chip and mobile terminal that Doppler frequency shift is modified Download PDFInfo
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- CN105376045B CN105376045B CN201510981490.2A CN201510981490A CN105376045B CN 105376045 B CN105376045 B CN 105376045B CN 201510981490 A CN201510981490 A CN 201510981490A CN 105376045 B CN105376045 B CN 105376045B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/02—Speed or phase control by the received code signals, the signals containing no special synchronisation information
- H04L7/033—Speed or phase control by the received code signals, the signals containing no special synchronisation information using the transitions of the received signal to control the phase of the synchronising-signal-generating means, e.g. using a phase-locked loop
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
- H04L2027/0018—Arrangements at the transmitter end
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
- H04L2027/0024—Carrier regulation at the receiver end
- H04L2027/0026—Correction of carrier offset
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Transceivers (AREA)
Abstract
The present invention relates to mobile communication technology fields, more particularly to one kind can be to the radio frequency chip and mobile terminal that Doppler frequency shift is modified.The present invention is by introducing two phase-locked loop in terminal side, one of phaselocked loop detects and tracks the frequency departure of downlink signal, another phaselocked loop carries out frequency precompensation to uplink signal, to realize the frequency offset correction to Doppler frequency shift in terminal side, the system resource overhead of base station side is reduced, to improve the number of users that base station can be accessed simultaneously.
Description
Technical field
The present invention relates to mobile communication technology fields, more particularly to one kind can be to the radio frequency core that Doppler frequency shift is modified
Piece and mobile terminal.
Background technique
LTE (long term evolution, Long Term Evolution), with its high transfer rate, high-transmission quality and high mobility
Etc. features, have become current mobile broadband communication system one of hot spot of greatest concern.The transmission of LTE system physical layer descending is adopted
With advanced and mature OFDMA (orthogonal frequency division multiple access, Orthogonal Frequency Division Multiple Access)
Technology, uplink use single carrier SC-FDMA (single-carrier frequency division multiple access, Single-carrier Frequency-
Division Multiple Access) technology.But the two is all very sensitive to frequency departure, particularly with the TDD- of high band
LTE system, Doppler frequency shift phenomenon becomes apparent under high-speed mobile environment, seriously affects system performance.
Currently, the major technique for solving Doppler frequency shift is exactly to carry out frequency deviation precorrection in base station side, when user terminal is sent out
Uplink signal is penetrated, base station side carries out frequency offset estimation to the uplink signal received, the exemplary frequency deviation values obtained using estimation
Signal is sent to downlink and carries out frequency deviation precorrection, then again launches data.This process simplify receive terminal processing,
But the processing complexity for increasing base station side, to increase the requirement to base station producer research and development technology, while researching and developing cost
It will be directly superimposed in whole networking hardware cost.Meanwhile base station side will increase base station system using the method for frequency deviation precorrection
The overhead for resource of uniting, for the data transmission efficiency for guaranteeing base station and terminal room, it is necessary to limit the use that base station can be accessed simultaneously
Amount amount reduces the user capacity of base station.
Summary of the invention
The technical problem to be solved by the invention is to provide it is a kind of can to the radio frequency chip that Doppler frequency shift is modified and
Mobile terminal by carrying out offset estimation to downlink signal in terminal side, and carries out frequency to uplink signal according to estimated result
Precompensation, so that the frequency offset correction to Doppler frequency shift is completed in terminal side, to reduce the system resource overhead of base station side.This hair
It is bright to be achieved in that
It is a kind of can be to the radio frequency chip that Doppler frequency shift is modified, including analog-digital converter, the first bandpass filter,
One multiplier, the first low-noise amplifier, digital analog converter, the second bandpass filter, the second multiplier, third bandpass filtering
Device；
Downlink signal is successively through first low-noise amplifier, the first multiplier, the first bandpass filter, analog-to-digital conversion
Form fundamental frequency signal after device processing, uplink signal successively through the digital analog converter, the second bandpass filter, the second multiplier,
Radiofrequency signal is formed after the processing of third bandpass filter, further includes two phaselocked loops；
One of phaselocked loop is connect with the first multiplier, and locking phase can be carried out to the output signal of the first multiplier, another
Phaselocked loop is connect with the second multiplier, can carry out locking phase to the output signal of the second multiplier.
Further, the phaselocked loop includes phase frequency detector, charge pump, voltage controlled oscillator, Fractional-N frequency device；The frequency discrimination
The output end of phase discriminator connects the input terminal of the charge pump, and the output end of the charge pump connects the defeated of the voltage controlled oscillator
Enter end, the output end of the voltage controlled oscillator connects the input terminal of the Fractional-N frequency device, and the output end of the Fractional-N frequency device connects institute
State the input terminal of phase frequency detector；The voltage controlled oscillator is also connect with first multiplier.
A kind of mobile terminal including any one radio frequency chip as described above, further includes baseband chip and crystal oscillation
Device；The crystal oscillator is connect with two phaselocked loops and baseband chip of the radio frequency chip, for for two phaselocked loops and
Baseband chip provides reference frequency；
The baseband chip is connect with two phaselocked loops, is received for the phaselocked loop detection by connecting with the first multiplier
Frequency shift (FS) of the downlink signal relative to the reference frequency, and described in the phase lock control by being connect with the first multiplier
The frequency of the output signal of first multiplier, meanwhile, frequency is carried out to uplink signal by the phaselocked loop connecting with the second multiplier
Rate precompensation, generates the frequency of the output signal of the second multiplier and the frequency shift (FS) size relative to the reference frequency
The opposite offset of the same direction.
Further, it is stored with frequency shift (FS) threshold value in the baseband chip, when the frequency shift (FS) reaches the threshold value
When, frequency precompensation just is carried out to uplink signal.
Further, the mobile terminal further includes application processor, and the application processor and the baseband chip connect
It connects, the frequency shift (FS) threshold value can be modified by the application processor.
Further, the mobile terminal further include the second low-noise amplifier, power amplifier, two channels filter,
Antenna, the two channels filter include downlink signal channel for receiving downlink signal and for emitting uplink signal
Row signal path；The antenna is connect by the downlink signal channel with the input terminal of second low-noise amplifier, institute
The output end for stating the second low-noise amplifier is connect with the input terminal of first low-noise amplifier；The third bandpass filtering
The output end of device is connect with the input terminal of the power amplifier, and the output end of the power amplifier passes through the uplink signal
Channel is connect with the antenna.
Further, the crystal oscillator is temperature compensating crystal oscillator.
Compared with prior art, the present invention is by introducing two phase-locked loop in terminal side, the detection of one of phaselocked loop and with
The frequency departure of track downlink signal, another phaselocked loop carry out frequency precompensation to uplink signal, to realize in terminal side to more
The general frequency offset correction for strangling frequency displacement, reduces the system resource overhead of base station side, to improve the user that base station can be accessed simultaneously
Quantity.
Detailed description of the invention
Fig. 1: the composition schematic diagram of mobile terminal provided in an embodiment of the present invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.
Fig. 1 shows the composition schematic diagram of mobile terminal provided by the invention, merely illustrates in figure related to the present invention
Part.According to Fig. 1, which includes radio frequency chip 1, baseband chip 2, crystal oscillator 3, application processor 4,
Two low-noise amplifiers 5, power amplifier 6, antenna 7 and two channels filter 8.
Radio frequency chip 1 can be any radio frequency chip including TDD-LTE radio frequency chip.Radio frequency chip 1 includes mould
Number converter 12, the first bandpass filter 13, the first multiplier 14, the first low-noise amplifier 15, digital analog converter 16, second
Bandpass filter 17, the second multiplier 18, third bandpass filter 19.In radio frequency chip 1, downlink signal is successively through the first low noise
Fundamental frequency signal, uplink are formed after acoustic amplifier 15, the first multiplier 14, the first bandpass filter 13, the processing of analog-digital converter 12
Signal successively through digital analog converter 16, the second bandpass filter 17, the second multiplier 18, third bandpass filter 19 processing after shape
At radiofrequency signal.
In the present invention, radio frequency chip 1 further includes two phaselocked loops 11, and one of phaselocked loop 11 and the first multiplier 14 connect
It connects, locking phase can be carried out to the output signal of the first multiplier 14, another phaselocked loop 11 is connect with the second multiplier 18, can be to second
The output signal of multiplier 18 carries out locking phase.The knot of locking phase is carried out to the output signal of the first multiplier 14 and the second multiplier 18
Fruit is can to make the output frequency of the first multiplier 14 and the second multiplier 18 in fixed frequency range or fixed frequency
In value.The output signal of first multiplier 14 is intermediate-freuqncy signal, which will continue on through the first bandpass filter 13, modulus
Become baseband signal after the processing of converter 12, input baseband chip 2 is handled.The phaselocked loop 11 being connect with the first multiplier 14
Frequency by controlling the output signal of the first multiplier 14 can carry out frequency displacement amendment to the downlink signal received.Second multiplication
The output signal of device 18 is radiofrequency signal, which launches as uplink signal, the locking phase connecting with the second multiplier 18
Ring 11 can realize the frequency precompensation to uplink signal by the frequency of the output signal of the second multiplier 18 of control.
Phaselocked loop 11 includes phase frequency detector 111, charge pump 114, voltage controlled oscillator 113, Fractional-N frequency device 112.Frequency and phase discrimination
The input terminal of the output end connection charge pump 114 of device 111, the input of the output end connection voltage controlled oscillator 113 of charge pump 114
End, the input terminal of the output end connection Fractional-N frequency device 112 of voltage controlled oscillator 113, the output end of Fractional-N frequency device 112 connect frequency and phase discrimination
The input terminal of device 111；Voltage controlled oscillator 113 is also connect with the first multiplier 14.Two phaselocked loops 11 pass through respective pressure respectively
It controls oscillator 113 and locking phase is carried out to the output signal of the first multiplier 14 and the second multiplier 18.
Crystal oscillator 3 is connect with two phaselocked loops 11 and baseband chip 2 of radio frequency chip 1, for being two phaselocked loops
11 and baseband chip 2 provide reference frequency.Crystal oscillator 3 is temperature compensating crystal oscillator, has temperature compensation function, essence
Degree and stability are high.Baseband chip 2 is connect with two phaselocked loops 11, for the phaselocked loop 11 by connecting with the first multiplier 14
Detect frequency shift (FS) of the received downlink signal relative to reference frequency, and the phaselocked loop 11 by connecting with the first multiplier 14
The frequency of the output signal of the first multiplier 14 is controlled, meanwhile, by the phaselocked loop 11 that is connect with the second multiplier 18 to uplink
Signal carries out frequency precompensation, makes the frequency of the output signal of the second multiplier 18 relative to reference frequency generation and frequency shift (FS)
The opposite offset of the size same direction receives base station so that balancing out uplink signal reaches the Doppler frequency shift that base station is
Uplink signal frequency it is equal with its reference frequency.When detecting the frequency shift (FS) of downlink signal, baseband chip 2 can be by with the
The phaselocked loop 11 of one multiplier 14 connection goes the mode of the frequency of the output signal of the first multiplier 14 of detection to realize to downlink letter
Number frequency detecting, the frequency for the downlink signal that then will test is compared with reference frequency, to obtain frequency shift (FS).
Baseband chip 2 can carry out the frequency of the output signal of the first multiplier 14 by the phaselocked loop 11 connecting with the first multiplier 14
Control, remains at it in frequency range of baseband chip 2.
Since communication system itself allows a certain range of frequency shift (FS), a certain range of frequency displacement offset will not be to communication
Quality causes to significantly affect, and only when frequency shift (FS) is more than to a certain degree, just it is necessary to carry out the amendment of frequency shift (FS) or benefit
It repays, therefore, glides to reduce system throughput caused by unnecessary Doppler frequency shift modification, it can be in baseband chip 2 in advance
A frequency shift (FS) threshold value is written, when the frequency shift (FS) of downlink signal reaches the threshold value, it is pre- that frequency just is carried out to uplink signal
Compensation improves signal processing efficiency to reduce unnecessary frequency displacement amendment.The mobile terminal further includes application processor 4, is answered
It is connect with processor 4 with baseband chip 2, the frequency shift (FS) threshold value stored in baseband chip 2 can be modified by application processor 4.
Two channels filter 8 includes downlink signal channel for receiving downlink signal and for emitting uplink signal
Row signal path.Antenna 7 is connect by downlink signal channel with the input terminal of the second low-noise amplifier 5, and the second low noise is put
The output end of big device 5 is connect with the input terminal of the first low-noise amplifier 15, and downlink signal is successively filtered through antenna 7, binary channels
The downlink signal channel of device 8, the second low-noise amplifier 5 enter the first low-noise amplifier 15.Third bandpass filter 19
Output end is connect with the input terminal of power amplifier 6, and the output end of power amplifier 6 is connected by uplink signal channel and antenna 7
It connects, uplink signal is after the sending of third bandpass filter 19, the successively uplink signal through power amplifier 6, two channels filter 8
Channel enters antenna 7, and is launched by antenna 7.
The above is merely preferred embodiments of the present invention, be not intended to limit the invention, it is all in spirit of the invention and
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within principle.
Claims (7)
1. one kind can be to the radio frequency chip that Doppler frequency shift is modified, including analog-digital converter, the first bandpass filter, first
Multiplier, the first low-noise amplifier, digital analog converter, the second bandpass filter, the second multiplier, third bandpass filter；
Downlink signal successively through first low-noise amplifier, the first multiplier, the first bandpass filter, analog-digital converter at
Fundamental frequency signal is formed after reason, uplink signal is successively through the digital analog converter, the second bandpass filter, the second multiplier, third
Radiofrequency signal is formed after bandpass filter processing, which is characterized in that further includes two phaselocked loops；
One of phaselocked loop is connect with the first multiplier, can carry out locking phase, another locking phase to the output signal of the first multiplier
Ring is connect with the second multiplier, can carry out locking phase to the output signal of the second multiplier；
Two phaselocked loops are also connect with the crystal oscillator of mobile terminal, for being two locking phases by crystal oscillator
Ring provides reference frequency, and two phaselocked loops also connects with the baseband chip of mobile terminal, is used for by baseband chip by with first
The phaselocked loop of multiplier connection detects frequency shift (FS) of the received downlink signal relative to the reference frequency, and by with first
The frequency of the output signal of first multiplier described in the phase lock control of multiplier connection, meanwhile, by baseband chip by with the
The phaselocked loop of paired multiplier connection carries out frequency precompensation to uplink signal, keeps the frequency of the output signal of the second multiplier opposite
The offset opposite with the frequency shift (FS) size same direction is generated in the reference frequency.
2. radio frequency chip as described in claim 1, which is characterized in that the phaselocked loop includes phase frequency detector, charge pump, pressure
Control oscillator, Fractional-N frequency device；The output end of the phase frequency detector connects the input terminal of the charge pump, the charge pump it is defeated
Outlet connects the input terminal of the voltage controlled oscillator, and the output end of the voltage controlled oscillator connects the input terminal of the Fractional-N frequency device,
The output end of the Fractional-N frequency device connects the input terminal of the phase frequency detector；
Two phaselocked loops are connected with first multiplier and second multiplier respectively by respective voltage controlled oscillator
It connects.
3. a kind of mobile terminal including radio frequency chip as claimed in claim 1 or 2, which is characterized in that further include base band core
Piece and crystal oscillator；The crystal oscillator is connect with two phaselocked loops and baseband chip of the radio frequency chip, for for
Two phaselocked loops and baseband chip provide reference frequency；
The baseband chip is connect with two phaselocked loops, for by the phaselocked loop that is connect with the first multiplier detect it is received under
Frequency shift (FS) of the row signal relative to the reference frequency, and first described in the phase lock control by being connect with the first multiplier
The frequency of the output signal of multiplier, meanwhile, it is pre- that frequency is carried out to uplink signal by the phaselocked loop connecting with the second multiplier
Compensation generates the frequency of the output signal of the second multiplier relative to the reference frequency identical as the frequency shift (FS) size
Contrary offset.
4. mobile terminal as claimed in claim 3, which is characterized in that frequency shift (FS) threshold value is stored in the baseband chip,
When the frequency shift (FS) reaches the threshold value, frequency precompensation just is carried out to uplink signal.
5. mobile terminal as claimed in claim 4, which is characterized in that further include application processor, the application processor with
The baseband chip connection, can modify the frequency shift (FS) threshold value by the application processor.
6. mobile terminal as claimed in claim 3, which is characterized in that further include the second low-noise amplifier, power amplifier,
Two channels filter, antenna, the two channels filter include downlink signal channel for receiving downlink signal and for sending out
Penetrate the uplink signal channel of uplink signal；The antenna passes through the downlink signal channel and second low-noise amplifier
Input terminal connection, the output end of second low-noise amplifier are connect with the input terminal of first low-noise amplifier；Institute
The output end for stating third bandpass filter is connect with the input terminal of the power amplifier, and the output end of the power amplifier is logical
The uplink signal channel is crossed to connect with the antenna.
7. mobile terminal as claimed in claim 3, which is characterized in that the crystal oscillator is temperature compensating crystal oscillation
Device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510981490.2A CN105376045B (en) | 2015-12-23 | 2015-12-23 | It is a kind of can be to the radio frequency chip and mobile terminal that Doppler frequency shift is modified |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510981490.2A CN105376045B (en) | 2015-12-23 | 2015-12-23 | It is a kind of can be to the radio frequency chip and mobile terminal that Doppler frequency shift is modified |
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| Publication Number | Publication Date |
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| CN105376045A CN105376045A (en) | 2016-03-02 |
| CN105376045B true CN105376045B (en) | 2019-04-16 |
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| CN201510981490.2A Active CN105376045B (en) | 2015-12-23 | 2015-12-23 | It is a kind of can be to the radio frequency chip and mobile terminal that Doppler frequency shift is modified |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106781374A (en) * | 2016-12-01 | 2017-05-31 | 广东技术师范学院 | A kind of self adaptation frequency corrects wireless remote controller |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101378276A (en) * | 2008-09-23 | 2009-03-04 | 林志华 | Method for correcting Doppler frequency difference of high speed moving body |
| CN101699917A (en) * | 2009-09-18 | 2010-04-28 | 深圳市云海通讯股份有限公司 | Repeater and method for processing downlink radio-frequency signal by same |
| CN102281066A (en) * | 2011-04-15 | 2011-12-14 | 上海迦美信芯通讯技术有限公司 | Frequency synthesizer applied to binary channel and multi-mode radio frequency receiver |
-
2015
- 2015-12-23 CN CN201510981490.2A patent/CN105376045B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101378276A (en) * | 2008-09-23 | 2009-03-04 | 林志华 | Method for correcting Doppler frequency difference of high speed moving body |
| CN101699917A (en) * | 2009-09-18 | 2010-04-28 | 深圳市云海通讯股份有限公司 | Repeater and method for processing downlink radio-frequency signal by same |
| CN102281066A (en) * | 2011-04-15 | 2011-12-14 | 上海迦美信芯通讯技术有限公司 | Frequency synthesizer applied to binary channel and multi-mode radio frequency receiver |
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| CN105376045A (en) | 2016-03-02 |
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