CN101056128B - Method and transmitter of the stable transmission power - Google Patents
Method and transmitter of the stable transmission power Download PDFInfo
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- CN101056128B CN101056128B CN2007101052018A CN200710105201A CN101056128B CN 101056128 B CN101056128 B CN 101056128B CN 2007101052018 A CN2007101052018 A CN 2007101052018A CN 200710105201 A CN200710105201 A CN 200710105201A CN 101056128 B CN101056128 B CN 101056128B
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Abstract
The present invention discloses a stable transmitting power method including: obtaining intermediate frequency of feedback figure; obtaining the time delay of the intermediate frequency signal of the feedback figure; obtaining the baseband signal after the predistortion processing corresponding to the intermediate frequency signal of the feedback figure according to said time delay; comparing the power of the intermediate frequency signal of the feedback figure with the power of the baseband signal after the predistortion processing corresponding to the intermediate frequency signal of the feedback figure to generate a result; computing the comparing result by using a power control algorithm to generate digital power control signals and radio frequency power control signals; adjusting the transmit power by using said digital power control signals and radio frequency power control signals. The present invention further discloses a transmitter. In the present invention, the obtaining of digital power control signals and radio frequency power control signals can be realized through comparing the power of the synchronous signals.
Description
Technical field
The present invention relates to wireless communication field, relate in particular to stable transmitting power method and transmitter.
Background technology
In the wireless communication system, in order to pursue high transmitter frequency, digital pre-distortion technology is used widely.Digital pre-distortion technology is, in advance baseband signal carried out digital pre-distortion, comprises the distortion of the transmission channel of high power amplifier with compensation, and is ideally identical through the preceding signal of the signal that obtains behind the power amplifier and digital pre-distortion.
Please refer to Fig. 1, be the transmitter schematic diagram of prior art.This transmitter 100 comprises that pre-distortion unit 101, multiplier 102, modulation and emission digital to analog converter 103, radio-frequency transmissions processing unit 104, high power amplifier 105, pre-distortion coefficients computing unit 106, feedback modulus transducer 107, feedback receiver 108, power splitter 109, asynchronous power ratio are examined analog to digital converter 111 and logarithmic detector unit 112 with power control unit 110, merit.Wherein, the feedback path generation feedback digital intermediate-freuqncy signal that comprises power splitter 109, feedback receiver 108 and feedback modulus transducer 107; The baseband signal of pre-distortion coefficients computing unit 106 after according to this feedback digital intermediate-freuqncy signal and pre-distortion produces pre-distortion coefficients, and sends these pre-distortion coefficients to pre-distortion unit 101; The power detection passage that comprises power splitter 109, logarithmic detector unit 112 and merit inspection analog to digital converter 111 produces the power detection digital signal; Asynchronous power ratio produces digital power control signal and radio frequency power control signal with the baseband signal of power control unit 110 after according to this power detection digital signal and pre-distortion, and digital power control signal and radio frequency power control signal are used to adjust transmitting power; The transmission channel that comprises pre-distortion unit 101, multiplier 102, modulation and emission digital to analog converter 103, radio-frequency transmissions processing unit 104 and high power amplifier 105 produces radiofrequency signal, and this radiofrequency signal is sent to radio-frequency filter 113; The outer interference signal of the band of radio-frequency filter 113 these radiofrequency signals of filtering, and to antenna 114 transmissions.
For the quality that guarantees to communicate by letter, the power output of transmitter need be stabilized in the certain power grade.The prior art stable transmitting power method is as follows: power splitter 109 sends the RF-coupled signal that receives from high power amplifier 105 to logarithmic detector unit 112; 112 pairs of these the RF-coupled signals in logarithmic detector unit carry out logarithmic detector, produce the rectified signal of reflected signal power logarithm size; Merit inspection analog to digital converter 111 is handled the rectified signal that logarithmic detector unit 112 rectified signals produce, and produces the power detection digital signal, sends this power detection digital signal with power control unit 110 to asynchronous power ratio; Asynchronous power ratio is obtained the power detection digital signal with power control unit 110, obtain the baseband signal after the pre-distortion, compare the power of power detection digital signal and the power of baseband signal after the pre-distortion, produce comparative result, use power control algorithm compared result to calculate, produce digital power control signal and radio frequency power control signal; Transmitter 100 uses this numeral power control signal and radio frequency power control signal that transmitting power is adjusted.
In realizing process of the present invention, the inventor finds that there are the following problems at least in the prior art, because the logarithmic detector unit is a slow device, the rectified signal of logarithmic detector unit output can't the reflected signal envelope quick variation, power detection digital signal that asynchronous power ratio is obtained with power control unit and the baseband signal after the pre-distortion can not be alignd in time, they are not same segment signals, by comparing the power of these two asynchronous signals, obtain digital power control signal and radio frequency power control signal; When using this numeral power control signal and radio frequency power control signal to adjust transmitting power, may cause the power departure, cause transmitting power off-design level.
Summary of the invention
The embodiment of the invention provides a kind of stable transmitting power method and transmitter, to realize obtaining digital power control signal and radio frequency power control signal by the power that compares synchronizing signal.
A kind of stable transmitting power method comprises: obtain the feedback digital intermediate-freuqncy signal; Obtain the time delay of feedback digital intermediate-freuqncy signal; Obtain the baseband signal after the pre-distortion of feedback digital intermediate-freuqncy signal correspondence according to time delay; Relatively the power of baseband signal after the pre-distortion of the power of feedback digital intermediate-freuqncy signal and feedback digital intermediate-freuqncy signal correspondence produces comparative result; Use power control algorithm compared result to calculate, produce digital power control signal and radio frequency power control signal; Use digital power control signal and radio frequency power control signal that transmitting power is adjusted.
A kind of transmitter, comprise: synchronizing power comparison and power control unit, be used to obtain the feedback digital intermediate-freuqncy signal, obtain the time delay of feedback digital intermediate-freuqncy signal, obtain the baseband signal after the pre-distortion of feedback digital intermediate-freuqncy signal correspondence according to time delay, power of baseband signal after the power of comparison feedback digital intermediate-freuqncy signal and the pre-distortion of feedback digital intermediate-freuqncy signal correspondence, produce comparative result, use power control algorithm compared result to calculate, produce digital power control signal and radio frequency power control signal; Multiplier is used to use synchronizing power to compare the digital power control signal that produces with power control unit, and the baseband signal after the pre-distortion is carried out digital power control; The radio-frequency transmissions processing unit is used to use synchronizing power to compare the radio frequency power control signal that produces with power control unit, and analog if signal is carried out radio-frequency power control.
From above technical scheme as can be seen, in embodiments of the present invention, obtain the feedback digital intermediate-freuqncy signal; Obtain the time delay of feedback digital intermediate-freuqncy signal; Obtain the baseband signal after the pre-distortion of feedback digital intermediate-freuqncy signal correspondence according to time delay; Relatively the power of baseband signal after the pre-distortion of the power of feedback digital intermediate-freuqncy signal and feedback digital intermediate-freuqncy signal correspondence produces comparative result; Use power control algorithm compared result to calculate, produce digital power control signal and radio frequency power control signal; Use digital power control signal and radio frequency power control signal that transmitting power is adjusted.Because the baseband signal after feedback digital intermediate-freuqncy signal and the pre-distortion can realize alignment in time by time delay, they can be same segment signals, by comparing the power of these two synchronizing signals, obtain exact figure power control signal and radio frequency power control signal; When using this numeral power control signal and radio frequency power control signal to adjust transmitting power, can realize power control well, make transmitting power be stabilized on the design level.
Description of drawings
Fig. 1 is the transmitter schematic diagram of prior art;
Fig. 2 is the stable transmission power method flow diagram of the embodiment of the invention one;
Fig. 3 is the transmitter schematic diagram of the embodiment of the invention two;
Fig. 4 is the transmitter schematic diagram of the embodiment of the invention five;
Fig. 5 a, Fig. 5 b, Fig. 5 c and Fig. 5 d are the isolation network cell schematics of the embodiment of the invention five.
Embodiment
The embodiment of the invention provides stable transmitting power method and transmitter.
Embodiment one:
Please refer to Fig. 2, be the stable transmission power method flow diagram of the embodiment of the invention one.
Power of baseband signal after the power of step 202. comparison feedback digital intermediate-freuqncy signal and the pre-distortion of feedback digital intermediate-freuqncy signal correspondence produces comparative result.
For fear of the influence of the uncertain factor of feedback path, can proofread and correct the power of this feedback digital intermediate-freuqncy signal to the power of feedback digital intermediate-freuqncy signal.Another embodiment based on embodiment one is as follows: before comparing power, obtain the correction coefficient of feedback path gain; When comparing power, the power of feedback digital intermediate-freuqncy signal be multiply by correction coefficient, obtain the power of the correction of feedback digital intermediate-freuqncy signal, relatively the power of baseband signal after the pre-distortion of the power of the correction of feedback digital intermediate-freuqncy signal and feedback digital intermediate-freuqncy signal correspondence.
Wherein, the above-mentioned correction coefficient of obtaining the feedback path gain has following two kinds of methods.
(1) obtain current temperature value, obtain the corresponding relation between the correction coefficient of temperature value and feedback path gain, according to current temperature value, the inquiry corresponding relation obtains the correction coefficient of feedback path gain.This method need be set up the corresponding relation between the correction coefficient of temperature value and feedback path gain in advance.This method can solve the problem of the temperature drift of feedback path.
(2) gain of feedback path is tested, produced test result; Obtain the correction coefficient of feedback path gain according to test result.The gain of feedback path has the nominal value that designs, and gain test result and this nominal value compare, and can obtain correction coefficient.This method can solve the temperature drift and the aging problem of feedback path.
Embodiment two:
Please refer to Fig. 3, be the transmitter schematic diagram of the embodiment of the invention two.This transmitter 300 comprises that pre-distortion unit 301, multiplier 302, modulation and emission digital to analog converter 303, radio-frequency transmissions processing unit 304, high power amplifier 305, pre-distortion coefficients computing unit 306, feedback modulus transducer 307, feedback receiver 308, synchronizing power compare and power control unit 309.
Pre-distortion unit 301 obtains through code modulated baseband signal, and the pre-distortion coefficients of using pre-distortion coefficients computing unit 306 to produce is carried out pre-distortion to this baseband signal, the baseband signal after the generation pre-distortion; Carry out pre-distortion and be distortion for the compensate for emission passage.
Multiplier 302 obtains the baseband signal after the pre-distortion that pre-distortion unit 301 produces, use synchronizing power to compare the digital power control signal that produces with power control unit 309, baseband signal after the pre-distortion is carried out digital power control, produce the baseband signal after the digital power control.
Modulation and emission digital to analog converter 303 obtain the baseband signal after the digital power control that multiplier 302 produces, and it is handled, and produce analog if signal.Below two kinds of methods can produce analog if signal: (1) earlier is modulated to digital medium-frequency signal with baseband signal, produces analog if signal through digital to analog converter then; (2) earlier I way word signal (component in the same way) and Q way word signal (quadrature component) are converted to I road analog signal and Q road analog signal, then analog signal are modulated to analog if signal.The modulation here and be input to pre-distortion unit 301 baseband signal the modulation in the coded modulation of process be distinguishing, modulation in the coded modulation is the mapping process that code signal arrives baseband signal, and modulation is a frequency translation process with the modulation of launching in the digital to analog converter 303.
Radio-frequency transmissions processing unit 304 obtains modulation and launches the analog if signal that digital to analog converter 303 produces, use synchronizing power to compare the radio frequency power control signal that produces with power control unit 309, analog if signal is carried out radio-frequency power control, through obtaining low power radiofrequency signal after the processing such as frequency translation, amplification.By radio frequency power control and the two coordinated of digital power control, can make the transmitting power of transmitter 300 stabilize to the certain power grade.
High power amplifier 305 obtains the radiofrequency signal that radio-frequency transmissions processing unit 304 produces, and this signal is handled, and produces the radiofrequency signal after amplifying.Radiofrequency signal after the amplification sends to radio-frequency filter 310, the outer interference signal of the band of radio-frequency filter 310 these radiofrequency signals of filtering, and send to antenna 311, and antenna 311 is transmitted into wireless space with signal.The output of high power amplifier 305 has coupler, can produce RF-coupled signal.
Feedback receiver 308 obtains the RF-coupled signal that high power amplifier 305 produces, and this RF-coupled signal is handled, and after handling through frequency translation, amplification etc., produces the feedback analog if signal.
Feedback modulus transducer 307 obtains the feedback analog if signal that feedback receiver 308 produces, handle this feedback analog if signal, produce the feedback digital intermediate-freuqncy signal, relatively send this feedback digital intermediate-freuqncy signal to pre-distortion coefficients computing unit 306 and synchronizing power simultaneously with power control unit 309.
Pre-distortion coefficients computing unit 306 obtains the feedback digital intermediate-freuqncy signal that feedback modulus transducer 307 produces, and this feedback digital intermediate-freuqncy signal is handled, and produces the time delay of this feedback digital intermediate-freuqncy signal.Obtain the baseband signal after the pre-distortion of this feedback digital intermediate-freuqncy signal correspondence.Baseband signal after feedback digital intermediate-freuqncy signal and the pre-distortion can realize alignment in time by time delay, and they can be same segment signals.Pre-distortion coefficients computing unit 306 is handled the baseband signal after feedback digital intermediate-freuqncy signal and its corresponding pre-distortion, produces pre-distortion coefficients.Pre-distortion coefficients computing unit 306 sends pre-distortion coefficients to pre-distortion unit 301, relatively sends the time delay of this feedback digital intermediate-freuqncy signal with power control unit 309 to synchronizing power.
Synchronizing power comparison and power control unit 309 obtain the feedback digital intermediate-freuqncy signal that feedback modulus transducer 307 produces, obtain the time delay of the feedback digital intermediate-freuqncy signal that pre-distortion coefficients computing unit 306 produces, obtain the baseband signal after the pre-distortion of this feedback digital intermediate-freuqncy signal correspondence according to this time delay.Baseband signal after feedback digital intermediate-freuqncy signal and the pre-distortion can realize alignment in time by time delay, and they can be same segment signals.Synchronizing power relatively with power control unit 309 power of baseband signal after the corresponding pre-distortion of the power of feedback digital intermediate-freuqncy signals and this feedback digital intermediate-freuqncy signal relatively, produce comparative result; Use power control algorithm compared result to calculate, produce digital power control signal and radio frequency power control signal.The power control algorithm can with following relating to parameters: allocation strategy of gain, digital power control and radio frequency power control that the control precision of designing requirement, high power amplifier 305 are current etc.Synchronizing power relatively sends digital power control signal with power control unit 309 to multiplier 302, sends radio frequency power control signal to radio-frequency transmissions processing unit 304.
Wherein synchronizing power comparison and power control unit 309 can comprise: feedback digital intermediate-freuqncy signal acquiring unit is used to obtain the feedback digital intermediate-freuqncy signal; The time delay acquiring unit is used to obtain the time delay of the feedback digital intermediate-freuqncy signal that feedback digital intermediate-freuqncy signal acquiring unit obtains; The baseband signal acquiring unit is used for the time delay obtained according to the time delay acquiring unit, obtains the baseband signal after the pre-distortion of the feedback digital intermediate-freuqncy signal correspondence that feedback digital intermediate-freuqncy signal acquiring unit obtains; Power comparison module, be used for the power of baseband signal after the pre-distortion of the power of the feedback digital intermediate-freuqncy signal that comparison feedback digital intermediate-freuqncy signal acquiring unit obtains and the feedback digital intermediate-freuqncy signal correspondence that the baseband signal acquiring unit obtains, produce comparative result; Power control signal generation unit is used to use the power control algorithm that the comparative result that power comparison module produces is calculated, and produces digital power control signal and radio frequency power control signal.
Embodiment three:
Present embodiment is based on embodiment two.For fear of the influence of the uncertain factor of feedback path, can proofread and correct the power of this feedback digital intermediate-freuqncy signal to the power of feedback digital intermediate-freuqncy signal.
In the present embodiment, synchronizing power relatively with power control unit before power relatively, obtain the correction coefficient of feedback path gain; When comparing power, the power of feedback digital intermediate-freuqncy signal be multiply by correction coefficient, obtain the power of the correction of feedback digital intermediate-freuqncy signal, relatively the power of baseband signal after the pre-distortion of the power of the correction of feedback digital intermediate-freuqncy signal and feedback digital intermediate-freuqncy signal correspondence produces comparative result.Accordingly, synchronizing power comparison and power control unit may further include the correction coefficient acquiring unit; The correction coefficient acquiring unit is used to obtain the correction coefficient of feedback path gain; Wherein, power comparison module multiply by the correction coefficient that the correction coefficient acquiring unit obtains with the power of the feedback digital intermediate-freuqncy signal that feedback digital intermediate-freuqncy signal acquiring unit obtains, obtain the power of the correction of feedback digital intermediate-freuqncy signal, relatively the power of baseband signal after the pre-distortion of the power of the correction of feedback digital intermediate-freuqncy signal and the feedback digital intermediate-freuqncy signal correspondence that the baseband signal acquiring unit obtains produces comparative result.
Embodiment four:
Present embodiment is based on embodiment three.Present embodiment obtains the correction coefficient of feedback path gain according to the corresponding relation between current temperature value inquiry temperature value and the correction coefficient; Present embodiment can solve the problem of the temperature drift of feedback path.
In the present embodiment, synchronizing power comparison and power control unit obtain current temperature value, obtain the corresponding relation between the correction coefficient of temperature value and feedback path gain, according to current temperature value, inquire about this corresponding relation, obtain the correction coefficient of feedback path gain.This method need be set up the corresponding relation between the correction coefficient of temperature value and feedback path gain in advance.Accordingly, synchronizing power comparison and power control unit may further include the temperature correction facotor memory cell; The temperature correction facotor memory cell is used for the corresponding relation between the correction coefficient of storing temperature value and feedback path gain; Wherein, the correction coefficient that the correction coefficient acquiring unit obtains the feedback path gain is specially, obtain current temperature value, according to current temperature value, corresponding relation between the temperature value of inquiry temperature correction facotor cell stores and the correction coefficient of feedback path gain obtains the correction coefficient of feedback path gain.
Embodiment five:
Present embodiment is based on embodiment three.Present embodiment obtains the correction coefficient of feedback path gain according to the gain test result to feedback path; Present embodiment can solve the temperature drift and the aging problem of feedback path.
Please refer to Fig. 4, be the transmitter schematic diagram of the embodiment of the invention five.This transmitter 400 comprises that pre-distortion unit 401, multiplier 402, modulation and emission digital to analog converter 403, radio-frequency transmissions processing unit 404, high power amplifier 405, pre-distortion coefficients computing unit 406, feedback modulus transducer 407, feedback receiver 408, isolation network unit 409, signal source 410, synchronizing power compare and power control unit 411.
In the present embodiment, the feedback path that comprises isolation network unit 409, feedback receiver 408 and feedback modulus transducer 407 produces the feedback digital intermediate-freuqncy signal; The baseband signal of pre-distortion coefficients computing unit 406 after according to this feedback digital intermediate-freuqncy signal and pre-distortion produces pre-distortion coefficients, produce the time delay of this feedback digital intermediate-freuqncy signal, and, relatively send the time delay of these feedback digital intermediate-freuqncy signals to synchronizing power with power control unit 411 to pre-distortion unit 401 these pre-distortion coefficients of transmission; Synchronizing power relatively with the baseband signal of power control unit 411 after according to the corresponding pre-distortion of this feedback digital intermediate-freuqncy signal and this feedback digital intermediate-freuqncy signal, produce digital power control signal and radio frequency power control signal, digital power control signal and radio frequency power control signal are used to adjust transmitting power; The transmission channel that comprises pre-distortion unit 401, multiplier 402, modulation and emission digital to analog converter 403, radio-frequency transmissions processing unit 404 and high power amplifier 405 produces radiofrequency signal, and this radiofrequency signal is sent to radio-frequency filter 412; The outer interference signal of the band of radio-frequency filter 412 these radiofrequency signals of filtering, and to antenna 413 transmissions; Antenna 413 is transmitted into wireless space with signal.
Signal source 410 is used for sending test massage to feedback path.Synchronizing power comparison and power control unit 411 further comprise signal source control unit and test result generation unit, and the signal source control unit is used for control signal source 410 and sends test massage to feedback path; The test result generation unit is used for the test signal through feedback path according to described signal source transmission, produces the gain test result; Wherein, the correction coefficient that the correction coefficient acquiring unit obtains the feedback path gain is specially, and the gain test result who produces according to the test result generation unit obtains the correction coefficient of feedback path gain.The gain of feedback path has the nominal value that designs, and gain test result and this nominal value compare, and can obtain correction coefficient.
Isolation network unit 409 is connected with feedback receiver 408, signal source 410 and high power amplifier 405, transmits the test signal that RF-coupled signal that high power amplifier 405 sends to feedback receiver 408 or signal source 410 send to feedback receiver 408.Synchronizing power comparison and power control unit 411 further comprise the isolation network control unit, and the isolation network control unit is used to control isolation network unit 409 and transmits RF-coupled signal or test signal.
Please refer to Fig. 5 a, Fig. 5 b, Fig. 5 c and Fig. 5 d, be the isolation network cell schematics of the embodiment of the invention five.Synchronizing power compares signal source control unit and isolation network control unit difference control signal source and the isolation network unit with power control unit.Wherein, there are 3 ports the isolation network unit, and port one connects feedback receiver, and port 2 connects high power amplifier, and port 3 connects signal source.Below in conjunction with Fig. 5, introduce 4 kinds of isolation network unit that the embodiment of the invention proposes respectively.
In Fig. 5 a, the isolation network unit directly is connected with feedback receiver, signal source and high power amplifier.In the RF-coupled signal of isolation network unit forwards, signal source control unit control signal source is output as 0, to avoid the influence of RF coupling signal; Be in idle condition at transmitter, and when needing the gain of test feedback path, output test signal in signal source control unit control signal source is to finish the test to the feedback path gain.
In Fig. 5 b, the isolation network unit directly is connected with feedback receiver, signal source, is connected with high power amplifier by switch S 1.In the RF-coupled signal of isolation network unit forwards, isolation network control unit control S1 closes, and signal source control unit control signal source is output as 0, to avoid the influence of RF coupling signal; In the gain of needs test feedback path, isolation network control unit control S1 opens, and output test signal in signal source control unit control signal source is to finish the test to the feedback path gain.
In Fig. 5 c, the isolation network unit directly is connected with feedback receiver, is connected with high power amplifier by switch S 2, is connected with signal source by switch S 3.In the RF-coupled signal of isolation network unit forwards, letter isolation network control unit control S2 closes, and control S3 opens; In the gain of needs test feedback path, letter isolation network control unit control S2 opens, and control S3 closes.
In Fig. 5 d, the isolation network unit directly is connected with feedback receiver, is connected with signal source with high power amplifier by single-pole double-throw switch (SPDT).In the RF-coupled signal of isolation network unit forwards, close being connected of feedback receiver and high power amplifier; In the gain of needs tests feedback path, close being connected of feedback receiver and signal source.
It is pointed out that the input signal of pre-distortion unit/multiplier and the relation of output signal are clear and definite, use known mathematical algorithms that input signal is carried out computing, just can obtain output signal; So can set up the baseband signal before the pre-distortion and the relation of the baseband signal after the pre-distortion, also can set up the baseband signal after the pre-distortion and the relation of the baseband signal after the digital power control by known mathematical algorithms by known mathematical algorithms.In above embodiment, synchronizing power relatively with the power control unit power of baseband signal after the corresponding pre-distortion of the power of feedback digital intermediate-freuqncy signal and this feedback digital intermediate-freuqncy signal relatively, produce comparative result.Be understandable that, synchronizing power comparison and power control unit can obtain the baseband signal before the pre-distortion, baseband signal before using known mathematical algorithms to pre-distortion is carried out computing, relatively the power of baseband signal before the pre-distortion of the process computing of the power of feedback digital intermediate-freuqncy signal and this feedback digital intermediate-freuqncy signal correspondence produces comparative result; Synchronizing power comparison and power control unit also can obtain the baseband signal after the digital power control, baseband signal after using known mathematical algorithms to digital power control is carried out computing, relatively the power of baseband signal after the process digital power control of computing of the power of feedback digital intermediate-freuqncy signal and this feedback digital intermediate-freuqncy signal correspondence produces comparative result.In like manner, the pre-distortion coefficients computing unit can obtain preceding baseband signal of pre-distortion or the baseband signal after the digital power control, produces pre-distortion coefficients according to the baseband signal after baseband signal before the pre-distortion or the digital power control.
From above technical scheme as can be seen, in embodiments of the present invention, obtain the feedback digital intermediate-freuqncy signal; Obtain the time delay of feedback digital intermediate-freuqncy signal; Obtain the baseband signal after the pre-distortion of feedback digital intermediate-freuqncy signal correspondence according to time delay; Relatively the power of baseband signal after the pre-distortion of the power of feedback digital intermediate-freuqncy signal and feedback digital intermediate-freuqncy signal correspondence produces comparative result; Use power control algorithm compared result to calculate, produce digital power control signal and radio frequency power control signal; Use digital power control signal and radio frequency power control signal that transmitting power is adjusted.Because the baseband signal after feedback digital intermediate-freuqncy signal and the pre-distortion can realize alignment in time by time delay, they can be same segment signals, by comparing the power of these two synchronizing signals, obtain digital power control signal and radio frequency power control signal, when using this numeral power control signal and radio frequency power control signal to adjust transmitting power, can realize power control well, make transmitting power be stabilized on the design level.
More than stable transmitting power method and transmitter that the embodiment of the invention provided are described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (10)
1. a stable transmitting power method is characterized in that, comprising:
Obtain the feedback digital intermediate-freuqncy signal; Obtain the time delay of described feedback digital intermediate-freuqncy signal; Obtain the baseband signal after the pre-distortion of described feedback digital intermediate-freuqncy signal correspondence according to described time delay;
Power of baseband signal after the pre-distortion of the power of more described feedback digital intermediate-freuqncy signal and described feedback digital intermediate-freuqncy signal correspondence produces comparative result;
Use the power control algorithm that described comparative result is calculated, produce digital power control signal and radio frequency power control signal; Use described digital power control signal and radio frequency power control signal that transmitting power is adjusted.
2. method according to claim 1 is characterized in that:
Before the power of baseband signal after the pre-distortion of the power of described feedback digital intermediate-freuqncy signal and described feedback digital intermediate-freuqncy signal correspondence, obtain the correction coefficient of feedback path gain;
Power of baseband signal after the pre-distortion of the power of described feedback digital intermediate-freuqncy signal and described feedback digital intermediate-freuqncy signal correspondence is specially, the power of described feedback digital intermediate-freuqncy signal be multiply by described correction coefficient, obtain the power of the correction of described feedback digital intermediate-freuqncy signal, the power of baseband signal after the pre-distortion of the power of the correction of more described feedback digital intermediate-freuqncy signal and described feedback digital intermediate-freuqncy signal correspondence.
3. method according to claim 2 is characterized in that:
Before the described correction coefficient of obtaining feedback path gain, obtain current temperature value, obtain the corresponding relation between the correction coefficient that temperature value and feedback path gain;
The described correction coefficient of obtaining the feedback path gain is specially, and according to described current temperature value, inquires about described corresponding relation, obtains the correction coefficient of feedback path gain.
4. method according to claim 2 is characterized in that:
Before the described correction coefficient of obtaining feedback path gain, the gain of feedback path is tested, produced test result;
The described correction coefficient of obtaining the feedback path gain is specially, and obtains the correction coefficient of feedback path gain according to described test result.
5. a transmitter is characterized in that, comprising:
Synchronizing power comparison and power control unit, be used to obtain the feedback digital intermediate-freuqncy signal, obtain the time delay of described feedback digital intermediate-freuqncy signal, obtain the baseband signal after the pre-distortion of described feedback digital intermediate-freuqncy signal correspondence according to described time delay, power of baseband signal after the pre-distortion of the power of more described feedback digital intermediate-freuqncy signal and described feedback digital intermediate-freuqncy signal correspondence, produce comparative result, use the power control algorithm that described comparative result is calculated, produce digital power control signal and radio frequency power control signal;
Multiplier is used to use described synchronizing power to compare the digital power control signal that produces with power control unit, and the baseband signal after the pre-distortion is carried out digital power control;
The radio-frequency transmissions processing unit is used to use described synchronizing power to compare the radio frequency power control signal that produces with power control unit, and analog if signal is carried out radio-frequency power control.
6. transmitter according to claim 5 is characterized in that, described synchronizing power comparison and power control unit comprise:
Feedback digital intermediate-freuqncy signal acquiring unit is used to obtain the feedback digital intermediate-freuqncy signal;
The time delay acquiring unit is used to obtain the time delay of the feedback digital intermediate-freuqncy signal that described feedback digital intermediate-freuqncy signal acquiring unit obtains;
The baseband signal acquiring unit is used for the time delay obtained according to described time delay acquiring unit, obtains the baseband signal after the pre-distortion of the feedback digital intermediate-freuqncy signal correspondence that described feedback digital intermediate-freuqncy signal acquiring unit obtains;
The correction coefficient acquiring unit is used to obtain the correction coefficient of feedback path gain;
Power comparison module, the power that is used for feedback digital intermediate-freuqncy signal that described feedback digital intermediate-freuqncy signal acquiring unit is obtained multiply by the correction coefficient that described correction coefficient acquiring unit obtains, obtain the power of the correction of described feedback digital intermediate-freuqncy signal, power of baseband signal after the pre-distortion of the feedback digital intermediate-freuqncy signal correspondence that the power of the correction of more described feedback digital intermediate-freuqncy signal and described baseband signal acquiring unit obtain produces comparative result;
Power control signal generation unit is used to use the power control algorithm that the comparative result that described power comparison module produces is calculated, and produces digital power control signal and radio frequency power control signal.
7. transmitter according to claim 6 is characterized in that, described synchronizing power comparison and power control unit further comprise:
The temperature correction facotor memory cell, be used for storing temperature value and feedback path the gain correction coefficient between corresponding relation;
Wherein, the correction coefficient that described correction coefficient acquiring unit obtains the feedback path gain is specially, obtain current temperature value, according to described current temperature value, inquire about the corresponding relation between the correction coefficient of the temperature value of described temperature correction facotor cell stores and feedback path gain, obtain the correction coefficient of feedback path gain.
8. transmitter according to claim 6 is characterized in that, further comprises:
Signal source is used for sending test massage to feedback path;
Described synchronizing power comparison and power control unit further comprise:
The signal source control unit is used to control described signal source and sends test massage to feedback path;
The test result generation unit is used for the test signal through feedback path according to described signal source transmission, produces the gain test result;
Wherein, the correction coefficient that described correction coefficient acquiring unit obtains the feedback path gain is specially, and according to the gain test result that described test result generation unit produces, obtains the correction coefficient of feedback path gain.
9. transmitter according to claim 8 is characterized in that, further comprises:
Feedback receiver is used to handle RF-coupled signal, produces the feedback analog if signal;
The feedback modulus transducer is used to handle the feedback analog if signal that described feedback receiver produces, and produces the feedback digital intermediate-freuqncy signal;
The pre-distortion coefficients computing unit is used to handle the feedback digital intermediate-freuqncy signal that described feedback modulus transducer produces, and produces the time delay of described feedback digital intermediate-freuqncy signal;
Wherein, described feedback modulus transducer sends the feedback digital intermediate-freuqncy signal of described generation to described synchronizing power comparison and power control unit, and described pre-distortion coefficients computing unit sends the time delay of the feedback digital intermediate-freuqncy signal of described generation to described synchronizing power comparison and power control unit.
10. transmitter according to claim 9 is characterized in that, further comprises:
High power amplifier is used to produce RF-coupled signal;
The isolation network unit, be used for being connected, transmit the test signal that RF-coupled signal that described high power amplifier sends to described feedback receiver or described signal source send to described feedback receiver with described feedback receiver, described signal source and described high power amplifier;
Described synchronizing power comparison and power control unit further comprise:
The isolation network control unit is used to control described RF-coupled signal of described isolation network unit forwards or test signal.
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| CN2007101052018A CN101056128B (en) | 2007-05-21 | 2007-05-21 | Method and transmitter of the stable transmission power |
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| CN101753182A (en) * | 2008-12-01 | 2010-06-23 | 中兴通讯股份有限公司 | Method for reusing pre-distortion channel and power detection channel and device |
| CN102065531B (en) * | 2009-11-13 | 2014-06-11 | 中兴通讯股份有限公司 | Power calibrating method and device |
| CN102431578B (en) * | 2011-11-17 | 2014-11-12 | 广东工业大学 | Method for processing railway flood detecting and early warning device based on radio frequency signal attenuation |
| CN102594749A (en) * | 2012-02-28 | 2012-07-18 | 中兴通讯股份有限公司 | Digital pre-distortion processing method and device |
| CN107659322A (en) * | 2016-07-26 | 2018-02-02 | 北京展讯高科通信技术有限公司 | The transmitting detection means and its control method of a kind of rf terminal |
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| KR20010026747A (en) * | 1999-09-08 | 2001-04-06 | 서평원 | Method and Device for Compensation of Distortion Signal in Communication System |
| CN1384602A (en) * | 2001-05-08 | 2002-12-11 | 华为技术有限公司 | Adaptive RF digital pre-distortion linearization method and circuit |
| CN1479471A (en) * | 2003-06-25 | 2004-03-03 | 浙江华立通信集团有限公司 | Method fast forward power optimizing channel for CDMA receiver |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20010026747A (en) * | 1999-09-08 | 2001-04-06 | 서평원 | Method and Device for Compensation of Distortion Signal in Communication System |
| CN1384602A (en) * | 2001-05-08 | 2002-12-11 | 华为技术有限公司 | Adaptive RF digital pre-distortion linearization method and circuit |
| CN1479471A (en) * | 2003-06-25 | 2004-03-03 | 浙江华立通信集团有限公司 | Method fast forward power optimizing channel for CDMA receiver |
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