CN103281278A - LTE (Long Term Evolution) communication transmission system, LTE communication receiving system and communication terminal - Google Patents
LTE (Long Term Evolution) communication transmission system, LTE communication receiving system and communication terminal Download PDFInfo
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- CN103281278A CN103281278A CN2013101467929A CN201310146792A CN103281278A CN 103281278 A CN103281278 A CN 103281278A CN 2013101467929 A CN2013101467929 A CN 2013101467929A CN 201310146792 A CN201310146792 A CN 201310146792A CN 103281278 A CN103281278 A CN 103281278A
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Abstract
The invention is applicable to the technical field of communication, and provides an LTE (Long Term Evolution) communication transmission system, which comprises a radio frequency transmitter, a radio frequency power amplifier, a first signal detector, a first controller and a first matched load; the radio frequency transmitter is used for outputting an LTE modulating signal; the radio frequency power amplifier is used for amplifying the LTE modulating signal; the first signal detector is used for detecting the peak value and average power of the LTE modulating signal and working out and transmitting the value of the peak-to-average ratio of the LTE modulating signal to the controller; the first controller is used for controlling the impedance value of the first matched load according to the peak-to-average ratio; and the first matched load serves as the matched load of the radio frequency power amplifier, and is a variable-impedance device. The invention also correspondingly provides an LTE communication receiving system and a communication terminal. Thereby the LTE communication transmission system, the LTE communication receiving system and the communication terminal can reduce the distortion of signals with a high peak-to-average ratio in communication transmission and receiving links, thus increasing the quality of signal transmission.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of LTE communications transmit system, receiving system and communication terminal.
Background technology
Along with the increase that the user requires wireless traffic, the use of 4G-LTE technology and market demand development increase.At LTE (Long Term Evolution, Long Term Evolution) in the terminal and equipment of technology, up and descending SC-FDMA (the Single-carrier Frequency-Division Multiple Access that adopted respectively, single-carrier frequency division multiple access) technology and OFDMA (Orthogonal Frequency Division Multiple Access, OFDM) technology, the peak-to-average force ratio of signal output obviously increases, for reducing the distortion of signal in amplification process that the signal peak-to-average ratio height causes, present some following two kinds of scheme of comparatively confirming: 1) develop the more PA of high-gain (Power Amplifier, radio-frequency power amplifier) with LNA (Low Noise Amplifier, low noise amplifier), reduce the distortion that caused by peak-to-average force ratio in the signal amplification process, these high performance PA and LNA are applied in main equipment; 2) optimize the peak-to-average force ratio of signal from the algorithm of signal, use signal on the basis of quality assurance, to reduce peak-to-average force ratio as far as possible.
More than the common ground of two kinds of schemes all be to reduce the distortion of high peak-to-average force ratio signal in communication equipment or terminal, improve communication quality.From present scheme, the device cost height of high-gain PA and LNA, simultaneously power consumption increases, and this scheme can be accepted on equipment such as base station, but requires in the terminal of low-power consumption inferior position obvious at mobile phone etc., and the power consumption increase must cause terminal capabilities to descend; The peak-to-average force ratio major defect of optimizing signal from signal algorithm is that algorithm is too complicated, and the efficient of various algorithms has in various degree and reduces.
In summary, existing LTE communication system and communication terminal on reality is used, obviously exist inconvenience and defective, so be necessary to be improved.
Summary of the invention
At above-mentioned defective, the object of the present invention is to provide a kind of LTE communications transmit system, receiving system and communication terminal, it can adjust operating state according to signal peak-to-average ratio, improves effectiveness and quality.
To achieve these goals, the invention provides a kind of LTE communications transmit system, comprising:
Radio-frequency (RF) transmitter is used for output LTE modulation signal;
Radio-frequency power amplifier is used for described LTE modulation signal is amplified processing;
First signal detector for detection of peak value and the average power of described LTE modulation signal, and calculates the value of the peak-to-average force ratio obtain described LTE modulation signal, and the value of described peak-to-average force ratio is sent to first controller;
First controller is for the resistance value of controlling first matched load according to described peak-to-average force ratio;
First matched load, as the matched load of described radio-frequency power amplifier, described first matched load is variable impedance apparatus.
According to LTE communications transmit of the present invention system, described first controller is preset with the first threshold of described LTE modulation signal peak-to-average force ratio;
If described LTE modulation signal peak-to-average force ratio is greater than described first threshold, then described first controller is controlled the resistance value of described first matched load, makes described radio-frequency power amplifier be operated in first operating state;
Otherwise described first controller is controlled the resistance value of described first matched load, makes described radio-frequency power amplifier be operated in second operating state.
According to LTE communications transmit of the present invention system, described first matched load is the variable dielectric constant load device.
According to LTE communications transmit of the present invention system, described first matched load is the composite set of variable capacitance and/or inductance.
The present invention also provides a kind of communication terminal of emission system as mentioned above that comprises.
The present invention also provides a kind of LTE communication receiving system, comprising:
Low noise amplifier is used for the LTE signal that receives is amplified processing;
The secondary signal detector for detection of peak value and the average power of described LTE signal, and calculates the value of the peak-to-average force ratio obtain described LTE signal, and the value of described peak-to-average force ratio is sent to second controller;
Second controller is for the resistance value of controlling second matched load according to described peak-to-average force ratio;
Second matched load, as the matched load of described low noise amplifier, described second matched load is variable impedance apparatus;
Radio frequency receiver is used for the described LTE signal demodulation process after amplifying.
According to LTE communication receiving system of the present invention, described second controller is preset with second threshold value of described LTE signal peak-to-average ratio;
If described LTE signal peak-to-average ratio is greater than described second threshold value, then described second controller is controlled the resistance value of described second matched load, makes described low noise amplifier be operated in first operating state;
Otherwise described second controller is controlled the resistance value of described second matched load, makes described low noise amplifier be operated in second operating state.
According to LTE communication receiving system of the present invention, described second matched load is the variable dielectric constant load device.
According to LTE communication receiving system of the present invention, described second matched load is the composite set of variable capacitance and/or inductance.
The present invention also provides a kind of communication terminal of receiving system as mentioned above that comprises.
The present invention is by at LTE communications transmit system and receiving system signalization detector, makes peak value and average power that it can detection signal, to obtain the peak-to-average force ratio of this signal.Simultaneously, the matched load of the amplifier of system all adopts variable load, the control of its controlled device.Controller is judged the operating state of system by signal peak-to-average ratio, and then control load makes corresponding impedance variation, so that signal can high-quality and high efficiency transmission.
Description of drawings
Fig. 1 is the structural representation of the LTE communications transmit system of one embodiment of the invention;
Fig. 2 is the structural representation of the LTE communication receiving system of one embodiment of the invention;
Fig. 3 is the structural representation of the communication terminal of one embodiment of the invention;
Fig. 4 A is Amplifier Gain and the impedance relationship schematic diagram of one embodiment of the invention;
Fig. 4 B is efficient and the impedance relationship schematic diagram of the amplifier of one embodiment of the invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explaining the present invention, and be not used in restriction the present invention.
Referring to Fig. 1, the invention provides a kind of LTE communications transmit system, this system 100 can be the software unit that is built in communication terminal, hardware cell or software and hardware combining unit.Described communication terminal can for portable terminal such as mobile phone, PDA(Personal Digital Assistant, personal digital assistant), palmtop PC etc.Described LTE communications transmit system 100 comprises:
Radio-frequency (RF) transmitter 101 is used for output LTE modulation signal.In LTE communications transmit system 100, the SC-CDMA technology is adopted in its emission, i.e. the LTE modulation signal of radio-frequency (RF) transmitter 101 outputs is the SC-CDMA modulation signal, and sends it to radio-frequency power amplifier 102 processing.
Radio-frequency power amplifier 102 is used for described LTE modulation signal is amplified processing.The LTE signal needs to amplify processing through radio-frequency power amplifier 102 before emission after ovennodulation, makes signal can transmit the requirement that farther distance satisfies communication whereby.
First matched load 105, as the matched load of described radio-frequency power amplifier 102, this first matched load 105 is variable impedance apparatus.Such as, this first matched load 105 can be the variable dielectric constant load device, also can be composite set of voltage-controlled variable capacitance and/or inductance etc., this variable impedance apparatus is not limited to above-mentioned two kinds of devices.
At present the relevant device that can change appearance value and sense value by voltage has been arranged, can be used as first matched load 105 of amplifier.In addition, the device impedance also changes along with the change in dielectric constant of device, can use relevant variable dielectric constant material as first matched load 105, and other variable load impedance device also can be used as the output loading of radio-frequency power amplifier 102 certainly.
The present invention changes the operating state of system, to improve signal transfer quality whereby by the resistance value of first controller, 104 controls, first matched load 105.Preferably, first controller 104 of the present invention is preset with the first threshold of described LTE modulation signal peak-to-average force ratio, if the actual peak-to-average force ratio of detected signal is greater than this first threshold, illustrate that then this peak-to-average force ratio is high peak-to-average force ratio, the impedance variation of first controller, 104 controls, first matched load 105, and then control radio-frequency power amplifier 102 makes it be operated in high gain state (first operating state); If the actual peak-to-average force ratio of detected signal is not more than this first threshold, illustrate that then this peak-to-average force ratio is low peak average ratio, the impedance variation of first controller, 104 controls, first matched load 105, and then control radio-frequency power amplifier 102 makes it be operated in high efficiency state (second operating state).
Referring to Fig. 2, the present invention provides a kind of LTE communication receiving system accordingly again, and this system 200 can be the software unit that is built in communication terminal, hardware cell or software and hardware combining unit.Described communication terminal can for portable terminal such as mobile phone, PDA(Personal Digital Assistant, personal digital assistant), palmtop PC etc.Described LTE communication receiving system 200 comprises:
Second matched load 204, as the matched load of described low noise amplifier 201, described second matched load 204 is variable impedance apparatus.Such as, this first matched load 105 can be the variable dielectric constant load device, also can be composite set of voltage-controlled variable capacitance and/or inductance etc., this variable impedance apparatus is not limited to above-mentioned two kinds of devices.
The present invention changes the operating state of system, to improve signal transfer quality whereby by the resistance value of second controller, 203 controls, second matched load 204.Preferably, second controller 203 of the present invention is preset with second threshold value of described LTE signal peak-to-average ratio, if the actual peak-to-average force ratio of detected signal is greater than this second threshold value, illustrate that then this peak-to-average force ratio is high peak-to-average force ratio, the impedance variation of second controller, 203 controls, second matched load 204, and then control low noise amplifier 201 makes it be operated in high gain state (first operating state); If the actual peak-to-average force ratio of detected signal is not more than this first threshold, illustrate that then this peak-to-average force ratio is low peak average ratio, the impedance variation of second controller, 203 controls, second matched load 204, and then control low noise amplifier 201 makes it be operated in high efficiency state (second operating state).
In LTE communications transmit or the receiving system, amplifier is under different loading conditions, can be operated in different states, this state can be determined, in conjunction with Fig. 4 A and Fig. 4 B, this figure is the different gains of PA of one embodiment of the invention and the SMITH circle diagram of efficient, and as can be seen from the figure the gain optimum impedance point of PA is different with efficient maximum impedance point, also has same operating state for LNA.
LTE communications transmit system of the present invention and receiving system can reduce high peak-to-average force ratio signal in communications transmit and the problem that receives distortion in the link process, improve the quality of signal transmission, simultaneously, under the lower situation of signal peak-to-average power, can control and make corresponding amplifier be operated in the high efficiency state, save power consumption.
The present invention also provides a kind of communication terminal 300 of LTE communications transmit system 100 and LTE communication receiving system 200 as mentioned above that comprises accordingly, as shown in Figure 3.In this communication terminal 300, radio-frequency (RF) transmitter 101 and radio frequency receiver 205 can be wholely set, and make it have SC-CDMA modulation and OFDMA demodulation function, and finish with signal of base station by send/receive antenna and to transmit.
LTE adopts SC-FDMA technology and OFDMA technology respectively in up emission and descending reception, the signal peak-to-average ratio of these two kinds debugging ZAP is higher, namely under the certain situation of average power signal, signal peak is higher, and PA and LNA have certain linearity, peak power output one timing, higher peak power input meeting distortion occurs at amplifier out.Often efficient is not high and amplifier (for example radio frequency PA) is operated under the maximum gain state, high-gain and high efficiency are a pair of contradiction indexs of Amplifier Design, and the amplifier of communication terminal 300 of the present invention by variableimpedance is set be the contradiction between balance high-gain and the low-power effectively.
In sum, the present invention is by at LTE communications transmit system and receiving system signalization detector, makes peak value and average power that it can detection signal, to obtain the peak-to-average force ratio of this signal.Simultaneously, the matched load of the amplifier of system all adopts variable load, the control of its controlled device.Controller is judged the operating state of system by signal peak-to-average ratio, and then control load makes corresponding impedance variation, so that signal can high-quality and high efficiency transmission.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (10)
1. a LTE communications transmit system is characterized in that, comprising:
Radio-frequency (RF) transmitter is used for output LTE modulation signal;
Radio-frequency power amplifier is used for described LTE modulation signal is amplified processing;
First signal detector for detection of peak value and the average power of described LTE modulation signal, and calculates the value of the peak-to-average force ratio obtain described LTE modulation signal, and the value of described peak-to-average force ratio is sent to first controller;
First controller is for the resistance value of controlling first matched load according to described peak-to-average force ratio;
First matched load, as the matched load of described radio-frequency power amplifier, described first matched load is variable impedance apparatus.
2. LTE communications transmit according to claim 1 system is characterized in that described first controller is preset with the first threshold of described LTE modulation signal peak-to-average force ratio;
If described LTE modulation signal peak-to-average force ratio is greater than described first threshold, then described first controller is controlled the resistance value of described first matched load, makes described radio-frequency power amplifier be operated in first operating state;
Otherwise described first controller is controlled the resistance value of described first matched load, makes described radio-frequency power amplifier be operated in second operating state.
3. LTE communications transmit according to claim 1 system is characterized in that described first matched load is the variable dielectric constant load device.
4. LTE communications transmit according to claim 1 system is characterized in that described first matched load is the composite set of variable capacitance and/or inductance.
5. one kind comprises the communication terminal as claim 1～4 emission system as described in each.
6. a LTE communication receiving system is characterized in that, comprising:
Low noise amplifier is used for the LTE signal that receives is amplified processing;
The secondary signal detector for detection of peak value and the average power of described LTE signal, and calculates the value of the peak-to-average force ratio obtain described LTE signal, and the value of described peak-to-average force ratio is sent to second controller;
Second controller is for the resistance value of controlling second matched load according to described peak-to-average force ratio;
Second matched load, as the matched load of described low noise amplifier, described second matched load is variable impedance apparatus;
Radio frequency receiver is used for the described LTE signal demodulation process after amplifying.
7. LTE communication receiving system according to claim 6 is characterized in that, described second controller is preset with second threshold value of described LTE signal peak-to-average ratio;
If described LTE signal peak-to-average ratio is greater than described second threshold value, then described second controller is controlled the resistance value of described second matched load, makes described low noise amplifier be operated in first operating state;
Otherwise described second controller is controlled the resistance value of described second matched load, makes described low noise amplifier be operated in second operating state.
8. LTE communication receiving system according to claim 6 is characterized in that, described second matched load is the variable dielectric constant load device.
9. LTE communication receiving system according to claim 6 is characterized in that, described second matched load is the composite set of variable capacitance and/or inductance.
10. one kind comprises the communication terminal as 6～9 receiving systems as described in each.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310146792.9A CN103281278B (en) | 2013-04-24 | 2013-04-24 | LTE (Long Term Evolution) communication transmission system, LTE communication receiving system and communication terminal |
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| CN201310146792.9A CN103281278B (en) | 2013-04-24 | 2013-04-24 | LTE (Long Term Evolution) communication transmission system, LTE communication receiving system and communication terminal |
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| CN103281278B CN103281278B (en) | 2017-03-22 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106358282A (en) * | 2016-10-26 | 2017-01-25 | 努比亚技术有限公司 | Device and method for optimizing emission power dissipation of mobile terminal |
| CN107404727A (en) * | 2017-09-07 | 2017-11-28 | 锐捷网络股份有限公司 | A kind of optimization method, device and the communication equipment of the network interface that communicates |
| WO2022068635A1 (en) * | 2020-09-30 | 2022-04-07 | 华为技术有限公司 | Signal processing circuit and related apparatus |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106358282A (en) * | 2016-10-26 | 2017-01-25 | 努比亚技术有限公司 | Device and method for optimizing emission power dissipation of mobile terminal |
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| WO2022068635A1 (en) * | 2020-09-30 | 2022-04-07 | 华为技术有限公司 | Signal processing circuit and related apparatus |
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| CN103281278B (en) | 2017-03-22 |
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