CN1132448C - Digital up conversion method and up converter with power control function - Google Patents
Digital up conversion method and up converter with power control function Download PDFInfo
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- CN1132448C CN1132448C CN 00119787 CN00119787A CN1132448C CN 1132448 C CN1132448 C CN 1132448C CN 00119787 CN00119787 CN 00119787 CN 00119787 A CN00119787 A CN 00119787A CN 1132448 C CN1132448 C CN 1132448C
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Abstract
The present invention discloses a digital up-frequency conversion method and an up-frequency converter with a power control function. The present invention utilizes the linearity of a signaling passage to firstly control the power grade and the power rise of a modulated digital signal on a baseband with low-data velocity and then carry out digital up-frequency conversion for the controlled modulation signal so that the power control and the up-frequency converter form a whole. After being adopted, the up-frequency conversion method and the up-frequency converter of the present invention reduce the design difficulty of radio frequency and have the advantages of easy production, low cost, good performance, high control precision, flexible control, little storage capacity and low data stream speed.
Description
The present invention relates to digital mobile communication system, more specifically refer to a kind of Digital Up Convert method and upconverter with control function of power.
One of effective measures that improve power system capacity in the communication system are to improve the utilance of frequency spectrum, and its concrete manifestation form is to reduce the interference of interchannel.Automated power control is to reduce one of effective way of disturbing, its principle is: self adaptation reduces the transmitter transmitting power when not needing maximum transmission power just can reach the situation of good transmission quality, promptly guaranteeing that transmission quality is higher than the average transmit power that reduces travelling carriage and base station under the prerequisite of given thresholding, thereby reducing interference other channels.Discontinuous emission is to reduce another effective way of disturbing, and it utilizes the voice activation detection technique, forbids power emission (ERP can be reduced half at least) when the user keeps silence, and has reduced the interference to other conversations.In fact discontinuous emission also is power control after all, this shows global system for mobile communications (GSM, power control down together) is significant for increasing power system capacity and improving channel quality, and the quality of a GSM sender performance quality depends on its power control performance to a great extent.
GSM power grade step footpath is defined as 2dB, is divided into to the individual dynamic power grade of individual rate of static power at least 7 (0～6) and 16 (0～15), promptly reaches the 42dB dynamic range at least.Rate of static power generally is the unit setting with the sub-district, in case givenly generally can not change, becomes when the dynamic power grade is during work.According to the code requirement of GSM05.05, should satisfy the time domain template requirement through the radio frequency transmissions of power controlling, satisfy the requirement of frequency domain template again.The control of traditional power normally realizes with analogue device that in radio frequency part its control difficulty is bigger, and stability, consistency, control precision also be cannot say for sure to demonstrate,prove.
The digitlization that the develop rapidly of large scale integrated circuit (VLSI) brings and broadband be a principal character of current Information Technology Development, it be reflected on the radio communication equipment be exactly digital device more and more near antenna, the linearity of the passage of posting a letter is more and more higher.Digital if technology is obtaining using widely in the moving communicating field at present, combine with digital if technology, the utilization passage favorable linearity characteristic of posting a letter, with power control Digital Realization, and to make power control and upconverter be one, not only can reduce the design difficulty of radio frequency, and have produce easy, with low cost, performance better, control advantage more flexibly, have great importance.The present invention is specially adapted to the broad band multicarrier gsm system.
For this reason, the purpose of this invention is to provide a kind of Digital Up Convert method and upconverter with control function of power.
To achieve these goals, the present invention adopts following technical scheme:
This Digital Up Convert method with control function of power is to utilize the linearity of the passage of posting a letter, and in the base band of low data rate modulated signal is carried out power grade and power climbing control earlier, and then the modulation signal after the control is carried out Digital Up Convert.
This digital up converter with control function of power comprises an address generator, a climbing data storage, two digital multipliers, two cascade integral comb filters, two high-speed figure multipliers, a high-speed adder, a digital controlled oscillator,
Wherein,
Described address generator is used to produce the address of readout power climbing data;
Described climbing data storage is used to store dynamic power climbing data, and is controlled jointly by address generator and dynamic power controlling grade;
Described two digital multipliers are finished the power control data that reads the data storage from climbing and multiplication process through the Guassian Minimum Shift Keying GMSK modulating baseband signal respectively;
Described two integral comb filters carry out interpolation and low-pass filtering and obtain the high speed baseband modulation signal two roadbed band signals of digital multiplier output respectively;
Described digital controlled oscillator is used to produce the quadrature carrier signal, and exports this carrier signal to two high-speed gears;
Described two high-speed figure multipliers multiply each other to the output of digital controlled oscillator and the output of two integral comb filters respectively;
Described high-speed adder is to the output addition of two high-speed figure multipliers, and the output digital medium-frequency signal.
The linearity of passage because utilization of the present invention is posted a letter is carried out power grade and power climbing control in the base band of low data rate to modulated signal earlier, and then the modulation signal after the control is carried out Digital Up Convert; And to make power control and upconverter be one, adopts digital form to carry out power control in base band.Therefore, adopt method of the present invention after, can reduce the design difficulty of radio frequency, and have produce easy, with low cost, performance is better, control precision is high and more flexible, memory space is few, speed data stream is low.
Below in conjunction with drawings and Examples, the present invention is done one explains:
Fig. 1 is a digital up converter structural principle block diagram of the present invention.
Fig. 2 becomes device to use schematic diagram on the numeral of the present invention.
Show that by emulation and experiment to gsm system in case the analog channel of posting a letter has certain linearity, power control just can partly be carried out at numeric field, the influence that the analog channel of posting a letter is controlled power just can be ignored and not remember.The present invention utilizes this basic thought just,, utilizes the linearity of the passage of posting a letter that is, in the base band of low data rate modulated signal is carried out power grade and power climbing control, then it is carried out Digital Up Convert,
Therefore, method of the present invention is: utilize the linearity of the passage of posting a letter, in the base band of low data rate modulated signal is carried out power grade and power climbing control earlier, and then the modulation signal after the control is carried out Digital Up Convert.
Described power grade power climbing control is meant that the base band at low data rate realizes that by digital multiplier modulated signal and power control curve multiply each other, and power control curve data is pre-written in the climbing data storage of digital up converter inside by external interface.
The rate of static power of carrier frequency generally is provided with by the sub-district, generally can not change once setting, so rate of static power and dynamic power grade and climb and fall control can be separated independent control, just consider Poewr control method and realization here by this method.At first calculate the climbing curve of Different Dynamic power grade, and store.The bit wide of base band data interpolation rate when memory capacity is climbed with realization power and power climbing data is relevant.Such as, GSM05.05 agreement regulation 0～15 dynamic power grade, base band GMSK modulation interpolation rate is R, power climbing data bit width is n, climb and fall time 8.25bits, then the power of storage climbing data capacity is 16*R*n*8.25.The about 6.02*ndB of dynamic range of power climbing.The number of the necessary guaranteed output climbing of base band GMSK modulation interpolation rate R data does not influence the climbing quality.Power climbing data are read by dynamic power grade and address generator control.The Primary Component digital multiplier of dynamic power control is mainly finished the multiplication process of power control data and baseband modulation signal.Digital multiplier does not have nonlinear problem, can avoid the pre-distortion of traditional analog power control to non-linear complexity, and multiplication is finished in base band in addition, and data rate is low, and its processing speed is not had too high requirement.
Please in conjunction with shown in Figure 1, according to said method of the present invention and the digital up converter 202 that designs comprises an address generator 106, a climbing data storage 107, two 104,105, two high-speed figure multipliers of 102,103, two cascade integral comb filters of digital multiplier 109,110, a high-speed adder 111, a digital controlled oscillator 108, wherein
Described address generator 106 is used to produce the address of readout power climbing data;
Described climbing data storage 107 is used to store dynamic power climbing data, and is controlled jointly by address generator 106 and dynamic power grade Pg;
Described two digital multipliers 102,103 are finished the power control data that reads the data storage 107 from climbing and multiplication process through the Guassian Minimum Shift Keying GMSK modulating baseband signal respectively;
Described two integral comb filters 104,105 carry out interpolation and low-pass filtering and obtain the high speed baseband modulation signal two roadbed band signals of digital multiplier 102,103 outputs respectively;
Described digital controlled oscillator 108 is used to produce the quadrature carrier signal, and exports this carrier signal to two high- speed gears 109 and 110;
Described two high-speed figure multipliers 109,110 multiply each other to the output of digital controlled oscillator 108 and the output of two integral comb filters 104,105 respectively;
The output addition of 111 pairs of two high-speed figure multipliers 109,110 of described high-speed adder, and output digital medium-frequency signal.
The operation principle of above-mentioned digital up converter is: after base band data is input to GMSK modulator 101, the data rate of output two-way quadrature is the GMSK modulating baseband signal of 270.833*RkHz, and I, Q baseband signal enter the digital up converter with dynamic power controlled function 202 that the present invention relates to subsequently.The power grade that address generator 106 is sent here with system is as tabling look-up the address, from power climbing tables of data, read the climbing data, give digital multiplier 102 and 103, realize that in 102 and 103 GMSK modulation I, Q signal multiply each other with the power control data respectively.To each time slot, the power control data comprises that 8.25*R power climbing data and 148*R power keep data, this 148*R maximum that keeps data to equal these dynamic power grade upward slope data, when storage, deposit a value and get final product, can realize the power grade and the climbing control of each time slot so flexibly.Base band GMSK modulation I, Q signal input-cascade integral comb filter (cic filter) 104 and 105 through dynamic power control carry out interpolation and low-pass filtering to I, Q signal respectively, obtain baseband modulation signal at a high speed.104 and 105 output respectively with the quadrature carrier signal multiplication and the addition of digital controlled oscillator (NCO) 108 output, realize Digital Up Convert.Two high- speed figure multipliers 109 and 110 and be that high-speed adder 111 has constituted digital mixer jointly, 111 outputs are digital medium-frequency signals.
For the linearity not high arrowband and broadband system, utilize digital up converter involved in the present invention, also belong to the present invention by the power control purpose method of the climb and fall curve being taked the mode of predistortion reach whole system with control thought and protect content.
Fig. 2 is the practical application example of digital up converter of the present invention, the 201st, and baseband processor, the 202nd, digital up converter 202,203rd of the present invention, digital to analog converter.
Claims (3)
1, a kind of Digital Up Convert method with control function of power, it is characterized in that: the post a letter linearity of passage of this method utilization, in the base band of low data rate modulated signal is carried out power grade and power climbing control earlier, and then the modulation signal after the control is carried out Digital Up Convert.
2, the Digital Up Convert method with control function of power as claimed in claim 1, it is characterized in that: described power grade power climbing control is meant that the base band at low data rate realizes that by digital multiplier modulated signal and power control curve multiply each other, and power control curve data is pre-written in the climbing data storage of digital up converter inside by external interface.
3, a kind of digital up converter with control function of power is characterized in that:
This upconverter comprises an address generator, a climbing data storage, two digital multipliers, two cascade integral comb filters, two high-speed figure multipliers, a high-speed adder, a digital controlled oscillator, wherein,
Described address generator is used to produce the address of readout power climbing data;
Described climbing data storage is used to store dynamic power climbing data, and is controlled jointly by address generator and dynamic power controlling grade;
Described two digital multipliers are finished the power control data that reads the data storage from climbing and multiplication process through the Guassian Minimum Shift Keying GMSK modulating baseband signal respectively;
Described two integral comb filters carry out interpolation and low-pass filtering and obtain the high speed baseband modulation signal two roadbed band signals of digital multiplier output respectively;
Described digital controlled oscillator is used to produce the quadrature carrier signal, and exports this carrier signal to two high-speed gears;
Described two high-speed figure multipliers multiply each other to the output of digital controlled oscillator and the output of two integral comb filters respectively;
Described high-speed adder is to the output addition of two high-speed figure multipliers, and the output digital medium-frequency signal.
Described digital controlled oscillator is used to produce the quadrature carrier signal, and exports this carrier signal to two high-speed gears.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00119787 CN1132448C (en) | 2000-08-29 | 2000-08-29 | Digital up conversion method and up converter with power control function |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 00119787 CN1132448C (en) | 2000-08-29 | 2000-08-29 | Digital up conversion method and up converter with power control function |
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| CN1340973A CN1340973A (en) | 2002-03-20 |
| CN1132448C true CN1132448C (en) | 2003-12-24 |
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| CN 00119787 Expired - Lifetime CN1132448C (en) | 2000-08-29 | 2000-08-29 | Digital up conversion method and up converter with power control function |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2012103723A1 (en) * | 2011-06-29 | 2012-08-09 | 华为技术有限公司 | A method and a device for adjusting signal transmission power |
| CN102751998A (en) * | 2012-04-06 | 2012-10-24 | 华北电力大学 | Data intermediate frequency module based on software radio receiver |
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