CN105376045A - Radio-frequency chip capable of correcting Doppler frequency shift and mobile terminal - Google Patents
Radio-frequency chip capable of correcting Doppler frequency shift and mobile terminal Download PDFInfo
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- CN105376045A CN105376045A CN201510981490.2A CN201510981490A CN105376045A CN 105376045 A CN105376045 A CN 105376045A CN 201510981490 A CN201510981490 A CN 201510981490A CN 105376045 A CN105376045 A CN 105376045A
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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
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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
- H04L2027/0018—Arrangements at the transmitter end
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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
- 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)
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Abstract
The invention relates to the technical field of mobile communication, and especially relates to a radio-frequency chip capable of correcting Doppler frequency shift and a mobile terminal. Double phase-locked loops are introduced at a terminal side, one of the phase-locked loops detects and tracks a frequency deviation of a downlink signal, and the other one of the phase-locked loops performs frequency precompensation on an uplink signal, so a frequency offset correction for the Doppler frequency shift is achieved at the terminal side, system resource expense on a base station side is reduced, and then the number of users capable of simultaneously accessed into a base station is improved.
Description
Technical field
The present invention relates to mobile communication technology field, particularly relate to a kind of radio frequency chip that can revise Doppler frequency shift and mobile terminal.
Background technology
LTE (Long Term Evolution, LongTermEvolution), with features such as its high transfer rate, high-transmission quality and high mobilities, has become one of current mobile broadband communication system focus of greatest concern.The transmission of LTE system physical layer descending adopts advanced and mature OFDMA (OFDM, OrthogonalFrequencyDivisionMultipleAccess) technology, uplink adopts single carrier SC-FDMA (single-carrier frequency division multiple access, Single-carrierFrequency-DivisionMultipleAccess) technology.But the two is all very responsive to frequency departure, especially for the TDD-LTE system of high band, under high-speed mobile environment, Doppler frequency shift phenomenon is more obvious, has a strong impact on systematic function.
At present, the major technique solving Doppler frequency shift carries out frequency deviation precorrection in base station side exactly, when user terminal transmit uplink signal, base station side carries out frequency offset estimation to the upward signal received, utilize and estimate that the exemplary frequency deviation values obtained carries out frequency deviation precorrection to descending transmission signal, and then data are launched.This process simplify the process of receiving terminal, but add the process complexity of base station side, thus add the requirement to base station producer research and development technology, R&D costs also will directly be added in overall networking hardware cost simultaneously.Meanwhile, base station side adopts the method for frequency deviation precorrection can increase the overhead of base station system resource, for ensureing the data transmission efficiency of base station and terminal room, must limit the number of users that base station can be accessed simultaneously, reducing the user capacity of base station.
Summary of the invention
Technical problem to be solved by this invention is, a kind of radio frequency chip that can revise Doppler frequency shift and mobile terminal are provided, by carrying out frequency deviation estimation in end side to downstream signal, and according to estimated result, frequency precompensation is carried out to upward signal, thus complete the frequency offset correction to Doppler frequency shift in end side, to reduce the system resource overhead of base station side.The present invention is achieved in that
The radio frequency chip can revised Doppler frequency shift, comprises analog to digital converter, the first band pass filter, the first multiplier, the first low noise amplifier, digital to analog converter, the second band pass filter, the second multiplier, the 3rd band pass filter;
Downstream signal forms fundamental frequency signal successively after described first low noise amplifier, the first multiplier, the first band pass filter, analog to digital converter process, upward signal forms radiofrequency signal successively after described digital to analog converter, the second band pass filter, the second multiplier, the 3rd band pass filter process, also comprises two phase-locked loops;
One of them phase-locked loop is connected with the first multiplier, and can carry out phase-locked to the output signal of the first multiplier, another phase-locked loop is connected with the second multiplier, can carry out phase-locked to the output signal of the second multiplier.
Further, described phase-locked loop comprises phase frequency detector, charge pump, voltage controlled oscillator, Fractional-N frequency device; The output of described phase frequency detector connects the input of described charge pump, described electric charge delivery side of pump connects the input of described voltage controlled oscillator, the output of described voltage controlled oscillator connects the input of described Fractional-N frequency device, and the output of described Fractional-N frequency device connects the input of described phase frequency detector; Described voltage controlled oscillator is also connected with described first multiplier.
Comprise a mobile terminal for any one radio frequency chip as above, also comprise baseband chip and crystal oscillator; Two phase-locked loops and the baseband chip of described crystal oscillator and described radio frequency chip are connected, for providing reference frequency for two phase-locked loops and baseband chip;
Described baseband chip is connected with two phase-locked loops, the frequency shift (FS) relative to described reference frequency of the downstream signal that receives is detected for the phase-locked loop by being connected with the first multiplier, and the frequency of output signal by the first multiplier described in the phase lock control that is connected with the first multiplier, simultaneously, by the phase-locked loop be connected with the second multiplier, frequency precompensation is carried out to upward signal, make the frequency of the output signal of the second multiplier produce the skew contrary with described frequency shift (FS) size equidirectional relative to described reference frequency.
Further, in described baseband chip, store frequency shift (FS) threshold value, when described frequency shift (FS) reaches described threshold value, just frequency precompensation is carried out to upward signal.
Further, described mobile terminal also comprises application processor, and described application processor is connected with described baseband chip, can revise described frequency shift (FS) threshold value by described application processor.
Further, described mobile terminal also comprises the second low noise amplifier, power amplifier, two channels filter, antenna, and described two channels filter comprises the downstream signal passage for receiving downstream signal and the upward signal passage for transmit uplink signal; Described antenna is connected with the input of described second low noise amplifier by described downstream signal passage, and the output of described second low noise amplifier is connected with the input of described first low noise amplifier; The output of described 3rd band pass filter is connected with the input of described power amplifier, and the output of described power amplifier is connected with described antenna by described upward signal passage.
Further, described crystal oscillator is temperature compensating crystal oscillator.
Compared with prior art, the present invention is by introducing two phase-locked loop in end side, one of them phase-locked loop detects and follows the tracks of the frequency departure of downstream signal, another phase-locked loop carries out frequency precompensation to upward signal, thus realize the frequency offset correction to Doppler frequency shift in end side, reduce the system resource overhead of base station side, thus improve the number of users that can simultaneously access base station.
Accompanying drawing explanation
Fig. 1: the composition schematic diagram of the mobile terminal that the embodiment of the present invention provides.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.
Fig. 1 shows the composition schematic diagram of mobile terminal provided by the invention, merely illustrates the part relevant with the present invention in figure.According to Fig. 1, this mobile terminal comprises radio frequency chip 1, baseband chip 2, crystal oscillator 3, application processor 4, second low noise amplifier 5, power amplifier 6, antenna 7 and two channels filter 8.
Radio frequency chip 1 can be any radio frequency chip comprising TDD-LTE radio frequency chip.Radio frequency chip 1 comprises analog to digital converter 12, first band pass filter 13, first multiplier 14, first low noise amplifier 15, digital to analog converter 16, second band pass filter 17, second multiplier 18, the 3rd band pass filter 19.In radio frequency chip 1, downstream signal forms fundamental frequency signal through the first low noise amplifier 15, first multiplier 14, first band pass filter 13, analog to digital converter 12 after processing successively, and upward signal forms radiofrequency signal through digital to analog converter 16, second band pass filter 17, second multiplier 18, the 3rd band pass filter 19 after processing successively.
In the present invention, radio frequency chip 1 also comprises two phase-locked loops 11, and one of them phase-locked loop 11 is connected with the first multiplier 14, can carry out phase-locked to the output signal of the first multiplier 14, another phase-locked loop 11 is connected with the second multiplier 18, can carry out phase-locked to the output signal of the second multiplier 18.Carry out phase-locked to the output signal of the first multiplier 14 and the second multiplier 18 as a result, can make the output frequency of the first multiplier 14 and the second multiplier 18 in fixing frequency band range or on fixing frequency values.The output signal of the first multiplier 14 is intermediate-freuqncy signal, and continuation is become baseband signal through the first band pass filter 13, analog to digital converter 12 after processing by this intermediate-freuqncy signal, and input baseband chip 2 processes.The phase-locked loop 11 be connected with the first multiplier 14 can carry out frequency displacement correction to the downstream signal received by the frequency of the output signal of control first multiplier 14.The output signal of the second multiplier 18 is radiofrequency signal, and this signal is launched as upward signal, and the phase-locked loop 11 be connected with the second multiplier 18 can realize the frequency precompensation to upward signal by the frequency of the output signal of control second multiplier 18.
Phase-locked loop 11 comprises phase frequency detector 111, charge pump 114, voltage controlled oscillator 113, Fractional-N frequency device 112.The output of phase frequency detector 111 connects the input of charge pump 114, the output of charge pump 114 connects the input of voltage controlled oscillator 113, the output of voltage controlled oscillator 113 connects the input of Fractional-N frequency device 112, and the output of Fractional-N frequency device 112 connects the input of phase frequency detector 111; Voltage controlled oscillator 113 is also connected with the first multiplier 14.Two phase-locked loops 11 carry out phase-locked respectively by the output signal of respective voltage controlled oscillator 113 to the first multiplier 14 and the second multiplier 18.
Two phase-locked loops 11 and the baseband chip 2 of crystal oscillator 3 and radio frequency chip 1 are connected, for providing reference frequency for two phase-locked loops 11 and baseband chip 2.Crystal oscillator 3 is temperature compensating crystal oscillator, has temperature compensation function, precision and stability high.Baseband chip 2 is connected with two phase-locked loops 11, the frequency shift (FS) relative to reference frequency of the downstream signal that receives is detected for the phase-locked loop 11 by being connected with the first multiplier 14, and the frequency of the output signal of the first multiplier 14 is controlled by the phase-locked loop 11 be connected with the first multiplier 14, simultaneously, frequency precompensation is carried out by the phase-locked loop 11 pairs of upward signals be connected with the second multiplier 18, the frequency of the output signal of the second multiplier 18 is made to produce the skew contrary with frequency shift (FS) size equidirectional relative to reference frequency, thus balance out upward signal and arrive the base station Doppler frequency shift that is, the frequency of the upward signal that base station is received is equal with its reference frequency.When detecting the frequency shift (FS) of downstream signal, the frequency detecting that baseband chip 2 goes the mode of the frequency of the output signal of detection first multiplier 14 to realize downstream signal by the phase-locked loop 11 be connected with the first multiplier 14, then the frequency of the downstream signal detected and reference frequency are compared, thus draw frequency shift (FS).Baseband chip 2 controls by the frequency of phase-locked loop 11 to the output signal of the first multiplier 14 be connected with the first multiplier 14, makes in its frequency band range remaining at baseband chip 2.
Because communication system itself allows the frequency shift (FS) of certain limit, frequency displacement skew in certain limit can not cause obvious impact to communication quality, only have when frequency shift (FS) exceedes to a certain degree, just be necessary correction or the compensation of carrying out frequency shift (FS), therefore, the system throughput caused for reducing unnecessary Doppler frequency shift modification glides, a frequency shift (FS) threshold value can be write in advance in baseband chip 2, when the frequency shift (FS) of downstream signal reaches this threshold value, just frequency precompensation is carried out to upward signal, thus reduce unnecessary frequency displacement correction, improve signal transacting efficiency.This mobile terminal also comprises application processor 4, and application processor 4 is connected with baseband chip 2, can be revised the frequency shift (FS) threshold value stored in baseband chip 2 by application processor 4.
Two channels filter 8 comprises the downstream signal passage for receiving downstream signal and the upward signal passage for transmit uplink signal.Antenna 7 is connected with the input of the second low noise amplifier 5 by downstream signal passage, the output of the second low noise amplifier 5 is connected with the input of the first low noise amplifier 15, and downstream signal enters the first low noise amplifier 15 through the downstream signal passage of antenna 7, two channels filter 8, the second low noise amplifier 5 successively.The output of the 3rd band pass filter 19 is connected with the input of power amplifier 6, the output of power amplifier 6 is connected with antenna 7 by upward signal passage, after upward signal sends from the 3rd band pass filter 19, upward signal passage successively through power amplifier 6, two channels filter 8 enters antenna 7, and is launched by antenna 7.
These are only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. the radio frequency chip can revised Doppler frequency shift, comprises analog to digital converter, the first band pass filter, the first multiplier, the first low noise amplifier, digital to analog converter, the second band pass filter, the second multiplier, the 3rd band pass filter;
Downstream signal forms fundamental frequency signal successively after described first low noise amplifier, the first multiplier, the first band pass filter, analog to digital converter process, upward signal forms radiofrequency signal successively after described digital to analog converter, the second band pass filter, the second multiplier, the 3rd band pass filter process, it is characterized in that, also comprise two phase-locked loops;
One of them phase-locked loop is connected with the first multiplier, and can carry out phase-locked to the output signal of the first multiplier, another phase-locked loop is connected with the second multiplier, can carry out phase-locked to the output signal of the second multiplier.
2. radio frequency chip as claimed in claim 1, it is characterized in that, described phase-locked loop comprises phase frequency detector, charge pump, voltage controlled oscillator, Fractional-N frequency device; The output of described phase frequency detector connects the input of described charge pump, described electric charge delivery side of pump connects the input of described voltage controlled oscillator, the output of described voltage controlled oscillator connects the input of described Fractional-N frequency device, and the output of described Fractional-N frequency device connects the input of described phase frequency detector; Described voltage controlled oscillator is also connected with described first multiplier.
3. comprise a mobile terminal for radio frequency chip as claimed in claim 1 or 2, it is characterized in that, also comprise baseband chip and crystal oscillator; Two phase-locked loops and the baseband chip of described crystal oscillator and described radio frequency chip are connected, for providing reference frequency for two phase-locked loops and baseband chip;
Described baseband chip is connected with two phase-locked loops, the frequency shift (FS) relative to described reference frequency of the downstream signal that receives is detected for the phase-locked loop by being connected with the first multiplier, and the frequency of output signal by the first multiplier described in the phase lock control that is connected with the first multiplier, simultaneously, by the phase-locked loop be connected with the second multiplier, frequency precompensation is carried out to upward signal, make the frequency of the output signal of the second multiplier produce the skew contrary with described frequency shift (FS) size equidirectional relative to described reference frequency.
4. mobile terminal as claimed in claim 3, is characterized in that, store frequency shift (FS) threshold value in described baseband chip, when described frequency shift (FS) reaches described threshold value, just carries out frequency precompensation to upward signal.
5. mobile terminal as claimed in claim 4, it is characterized in that, also comprise application processor, described application processor is connected with described baseband chip, can revise described frequency shift (FS) threshold value by described application processor.
6. mobile terminal as claimed in claim 3, it is characterized in that, also comprise the second low noise amplifier, power amplifier, two channels filter, antenna, described two channels filter comprises the downstream signal passage for receiving downstream signal and the upward signal passage for transmit uplink signal; Described antenna is connected with the input of described second low noise amplifier by described downstream signal passage, and the output of described second low noise amplifier is connected with the input of described first low noise amplifier; The output of described 3rd band pass filter is connected with the input of described power amplifier, and the output of described power amplifier is connected with described antenna by described upward signal passage.
7. mobile terminal as claimed in claim 3, it is characterized in that, described crystal oscillator is temperature compensating crystal oscillator.
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 |
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| 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 true CN105376045A (en) | 2016-03-02 |
| CN105376045B 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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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101378276B (en) * | 2008-09-23 | 2014-06-18 | 林志华 | Method for correcting Doppler frequency difference of high speed moving body |
| CN101699917B (en) * | 2009-09-18 | 2012-08-08 | 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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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| CN105376045B (en) | 2019-04-16 |
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