CN1340974A - Digital up converter supporting intelligent antenna - Google Patents
Digital up converter supporting intelligent antenna Download PDFInfo
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- CN1340974A CN1340974A CN 00119790 CN00119790A CN1340974A CN 1340974 A CN1340974 A CN 1340974A CN 00119790 CN00119790 CN 00119790 CN 00119790 A CN00119790 A CN 00119790A CN 1340974 A CN1340974 A CN 1340974A
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Abstract
A digital up-frequency converter able to support intelligent antenna is composed of modulation module, power control power, multiplier module, numerally controlled oscillator module, frequency mixer module, and multi-channel summing module. Its advantages are simplified circuit, simple design, low cost and easy regulation.
Description
The present invention relates to digital mobile communication system, more specifically be meant a kind of digital up converter supporting intelligent antenna.
(GSM, down together) for the second generation mobile communication system of representative is very ripe, mainly is the main flow business with the speech with global system for mobile communications.But along with the high speed of the Internet (Internet) emerges, the demand develop rapidly of the data communication by wireless air interface, second generation mobile communication system is to 3-G (Generation Three mobile communication system) evolution.
As a pith in the mobile communcations system, antenna technology is also carrying out major transformation simultaneously.Antenna system more and more causes everybody concern as a novel antenna system.
Intelligent antenna technology can obviously improve the performance of wireless (wireless) communication system, and it can make PCS, cellular (GSM, EDGE, CDMA), WLL (wireless local loop) network be significantly increased on signal quality, signal volume and signal coverage rate.
It is transparent that intelligent antenna technology is used for the network application technology, and it can be suitable for all mobile communcations system and mobile communication networks now for modulation system and air interface protocol without limits.
The self-contained unit of support smart antenna emission adopts usually at RF (radio frequency) end adding partial simulation circuit, makes the radiofrequency signal of output satisfy the smart antenna application requirement, but the sort circuit design is complicated, the adjustment difficulty, and cost is higher, so application surface is wideless.
Digital if technology has become in the mobile communcations system comparatively one of mature technique, and digital up converter (DUC) has obtained applying.How in number realize supporting intelligent antenna technology in the frequency converter? be to use and promote one of key that adopts the smart antenna lift-off technology, that is to say, design a kind of the collection and support that the digital up converter that is installed on of smart antenna is that the upconverter of one is with a wide range of applications and important meaning.
For this reason, the purpose of this invention is to provide a kind of digital up converter supporting intelligent antenna.
To achieve these goals, the present invention adopts following technical scheme:
This digital up converter supporting intelligent antenna comprises modulation module, power control module, multiplication module, digital controlled oscillator module, mixer module and multichannel summation module, wherein,
Modulation module receives baseband digital signal and finishes modulation treatment to this input signal, output digital inphase signal and orthogonal signalling;
The modulation signal that power control module is exported modulation module according to different grades carries out the power control and treatment;
Signal after handling through power control module is carried out plural number to multiplication module or real number multiplies each other, and input in the mixer module;
The digital controlled oscillator module produces a single digital medium-frequency signal and inputs in the mixer module;
Mixer module carries out the output of digital controlled oscillator module and multiplication module to obtain single channel modulated medium frequency signal and output to the multichannel summation module after the Frequency mixing processing;
The multichannel summation module can carry out addition to the intermediate-freuqncy signal after the multichannel modulation.
Described multiplication module is the complex multiplier module, this complex multiplier module is adjusted by real part adjusted value and imaginary part adjusted value, to multiply each other through digital I, the Q signal after the power controller resume module obtains solid part signal and imaginary signals, and solid part signal and imaginary signals are admitted to the mixer module of next stage.
Described multiplication module is the real multipliers module, and this real multipliers module is adjusted by different amplitude adjusted values, will multiply each other through digital I, the Q signal after the power controller resume module and deliver to mixer module; Simultaneously, after the digital controlled oscillator module was adjusted by different phase adjustment values, mixer module was also delivered in its output.
The present invention has adopted by modulation module, power control module, multiplication module, the digital controlled oscillator module, the digital up converter that mixer module and multichannel summation module constitute, particularly multiplication module is designed to complex multiplier and real multipliers, its collection supports that the digital up converter that is installed on of smart antenna is an one, after adopting digital up converter of the present invention, can finish dealing with at numerical portion and support the demand of smart antenna, can realize that in mobile communcations system smart antenna transmits, make and to save at the circuit of analog transmissions section processes originally, its simplicity of design, easy to adjust, cost also decreases, and has broad application prospects.
Below in conjunction with drawings and Examples, the present invention is done one explains:
Fig. 1 is a smart antenna transmission channel theory structure block diagram.
Fig. 2 is a digital up converter theory structure block diagram of the present invention.
Fig. 3 is another digital up converter theory structure block diagram of the present invention.
Fig. 4 is an another digital up converter theory structure block diagram of the present invention.
Fig. 5 is the application example theory diagram of digital up converter of the present invention.
Please consult shown in Figure 1ly earlier, using smart antenna is the new ideas that propose in the mobile communcations system field.As can be seen from Figure 1, the baseband signal after the Base-Band Processing is outwards launched by smart antenna through behind the digital up converter, radio frequency successively, has illustrated the several transmitting antenna among Fig. 1.
The use of smart antenna need be satisfied following relation:
Adopt the implement device of complex multiplier in number among the frequency converter DUC, the value of complex multiplier real part, imaginary part
Can change by time slot.
Adopt the digital up converter DUC of complex multiplier in concrete application-specific integrated circuit (ASIC) (ASIC) is realized, to need four real multipliers and two full adders to finish.
Complex multiplication implement body complete operation is:
Real part:
Imaginary part;
In order to reduce application-specific integrated circuit (ASIC) (ASIC) design resource, we consider again to replace complex multiplier with real multipliers.
(1) derives to formula, can obtain:
A wherein
j, θ
jIt is the number that changes by time slot Slot
The effect of complex multiplier is broken down into two parts: a part is an amplitude A
jEffect; Another part is the θ of intermediate frequency mixer phase place
jEffect.
The digital controlled oscillator phase theta
jAdjust A with amplitude
jAll can change, carry out the minimum point that amplitude and phase place adjustment are all controlled at power by time slot; Each channel amplitude and phase place adjustment keep synchronized relation; Phase adjustment value θ
jAdopt N bit control, improve the degree of regulation of initial phase.
According to above-mentioned design philosophy, core concept of the present invention is that upconverter is redesigned, to this, see also shown in Figure 2,
This digital up converter comprises modulation module, power control module, multiplication module, digital controlled oscillator module, mixer module and multichannel summation module, wherein,
Modulation module receives baseband digital signal and finishes modulation treatment to this input signal, output digital inphase signal (I) and orthogonal signalling (Q);
The modulation signal that power control module is exported modulation module according to different grades carries out the power control and treatment;
Signal after handling through power control module is carried out plural number to multiplication module or real number multiplies each other, and input in the mixer module, to guarantee supporting smart antenna;
The digital controlled oscillator module produces a single digital medium-frequency signal and inputs in the mixer module;
Mixer module carries out the output of digital controlled oscillator module and multiplication module to obtain single channel modulated medium frequency signal and output to the multichannel summation module after the Frequency mixing processing;
The multichannel summation module can carry out addition, F to the intermediate-freuqncy signal after the multichannel modulation
jRepresent other modulated medium frequency signal, that is, summation module is exactly with the addition of suing for peace of the intermediate-freuqncy signal of mixer module output and other modulated medium frequency signal.
Please consult shown in Figure 3ly again, described multiplication module is the complex multiplier module, and this complex multiplier module is by real part adjusted value B
jWith imaginary part adjusted value C
jAdjust, will multiply each other through the digital inphase signal after the power controller resume module (I), orthogonal signalling (Q) obtains solid part signal and imaginary signals, and solid part signal and imaginary signals are admitted to the mixer module of next stage.Operation principle is, modulation module produces baseband modulation signal after finishing modulation function, power control module carries out relevant power control and treatment according to different grades to baseband modulation signal, complex multiplier is by being provided with different real part adjusted values and imaginary part adjusted value, thereby guarantee that digital up converter can cooperate the instructions for use of smart antenna, digital controlled oscillator produces single digital medium-frequency signal, frequency mixer obtains the single channel modulated medium frequency after treatment with digital controlled oscillator output and multiplier output, the multichannel summation module is finished the summation addition of several single channel modulated medium frequency signals, to satisfy the needs of suing for peace with other modulated medium frequency signal.
Please continue to consult shown in Figure 4, described multiplication module is the real multipliers module, and this real multipliers module is adjusted by different amplitude adjusted values, will multiply each other through digital I, the Q signal after the power controller resume module and deliver to mixer module; Simultaneously, after the digital controlled oscillator module was adjusted by different phase adjustment values, mixer module was also delivered in its output.
Operation principle is as follows: modulation module produces baseband modulation signal after finishing modulation function, power control module carries out relevant power control and treatment according to different grades to baseband modulation signal, real multipliers is the special module that increases for the use that is fit to smart antenna, by different amplitude adjusted values is set, to guarantee that digital up converter can cooperate the instructions for use of smart antenna, digital controlled oscillator produces single digital medium-frequency signal, and adjust the initial phase of intermediate-freuqncy signal by phase adjustment value, phase adjustment value increases newly for being fit to the smart antenna use, and with the acting in conjunction of amplitude adjusted value, frequency mixer obtains the single channel modulated medium frequency after treatment with digital controlled oscillator output and multiplier output, the multichannel summation module is finished the summation addition of several single channel modulated medium frequency signals, to satisfy the needs of suing for peace with other modulated medium frequency signal.
By system emulation and circuit FPGA checking, digital up converter of the present invention satisfies the requirement of smart antenna fully.
Fig. 5 has illustrated one of the present invention to use example, and among the figure, unit 41 is baseband functions processing modules, finishes Base-Band Processing such as source encoding, chnnel coding, and sends baseband signal to the unit 43.Unit 43 is digital up converter (DUC) with support smart antenna function that the present invention pays close attention to, and in order to support the function of the many antennas emissions of smart antenna, generally can select a plurality of digital up converter for use.For mode of operation and amplitude adjusted value, the phase adjustment value etc. of control figure upconverter, introduced digital signal processing unit 42, the control of being correlated with.Unit 44 is high speed, high accuracy DAC, and the digital intermediate frequency modulation signal that digital up converter is exported is converted into the analog intermediate frequency modulation signal.Unit 45 is RF processing units, analog if signal is carried out linear amplification, bandpass filtering and frequency spectrum shift after, be transformed into analog radio-frequency signal and send into unit 46, promptly the smart antenna unit is transmitted into the space at last.
This example should consider how each passage digital up converter is applied corresponding amplitude adjusted value and phase adjustment value in concrete enforcement; System should guarantee that each passage adjustment carries out synchronously.
Claims (3)
1, a kind of digital up converter supporting intelligent antenna is characterized in that: this digital up converter comprises modulation module, power control module, multiplication module, digital controlled oscillator module, mixer module and multichannel summation module, wherein,
Modulation module receives baseband digital signal and finishes modulation treatment to this input signal, output digital inphase signal and orthogonal signalling;
The modulation signal that power control module is exported modulation module according to different grades carries out the power control and treatment;
Signal after handling through power control module is carried out plural number to multiplication module or real number multiplies each other, and input in the mixer module;
The digital controlled oscillator module produces a single digital medium-frequency signal and inputs in the mixer module;
Mixer module carries out the output of digital controlled oscillator module and multiplication module to obtain single channel modulated medium frequency signal and output to the multichannel summation module after the Frequency mixing processing;
The multichannel summation module can carry out addition to the intermediate-freuqncy signal after the multichannel modulation.
2, digital up converter supporting intelligent antenna as claimed in claim 1, it is characterized in that: described multiplication module is the complex multiplier module, this complex multiplier module is adjusted by real part adjusted value and imaginary part adjusted value, to multiply each other through digital homophase, the orthogonal signalling after the power controller resume module obtains solid part signal and imaginary signals, and solid part signal and imaginary signals are admitted to the mixer module of next stage.
3, digital up converter supporting intelligent antenna as claimed in claim 1, it is characterized in that: described multiplication module is the real multipliers module, this real multipliers module is adjusted by different amplitude adjusted values, will multiply each other through digital homophase, the orthogonal signalling after the power controller resume module and deliver to mixer module; Simultaneously, after the digital controlled oscillator module was adjusted by different phase adjustment values, mixer module was also delivered in its output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00119790 CN1132449C (en) | 2000-08-29 | 2000-08-29 | Digital up converter supporting intelligent antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00119790 CN1132449C (en) | 2000-08-29 | 2000-08-29 | Digital up converter supporting intelligent antenna |
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| Publication Number | Publication Date |
|---|---|
| CN1340974A true CN1340974A (en) | 2002-03-20 |
| CN1132449C CN1132449C (en) | 2003-12-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00119790 Expired - Fee Related CN1132449C (en) | 2000-08-29 | 2000-08-29 | Digital up converter supporting intelligent antenna |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106571778A (en) * | 2016-11-01 | 2017-04-19 | 航天恒星科技有限公司 | Ka-waveband up-conversion device and up-conversion method |
-
2000
- 2000-08-29 CN CN 00119790 patent/CN1132449C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106571778A (en) * | 2016-11-01 | 2017-04-19 | 航天恒星科技有限公司 | Ka-waveband up-conversion device and up-conversion method |
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| CN1132449C (en) | 2003-12-24 |
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Granted publication date: 20031224 Termination date: 20160829 |