CN105720996B - Direct conversion system and its implementation in a kind of Digital Clustering hand-held set - Google Patents
Direct conversion system and its implementation in a kind of Digital Clustering hand-held set Download PDFInfo
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- CN105720996B CN105720996B CN201610298575.5A CN201610298575A CN105720996B CN 105720996 B CN105720996 B CN 105720996B CN 201610298575 A CN201610298575 A CN 201610298575A CN 105720996 B CN105720996 B CN 105720996B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/0003—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B1/0475—Circuits with means for limiting noise, interference or distortion
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Abstract
The invention discloses the Direct conversion system and its implementation in a kind of Digital Clustering hand-held set, solve the problems, such as that meeting present in the prior art generates serious local oscillator and sideband leakage.Direct conversion system in the Digital Clustering hand-held set, comprising: baseband signal processing module exports I/Q two-way orthogonal digital baseband signal；I/Q two-way orthogonal digital baseband signal is converted to simulation i/q signal by binary channels Digital To Analog Convert；Root-raised cosine low-pass wave device, has the function of pulse shaping and anti-ISI, handles the simulation i/q signal of binary channels Digital To Analog Convert output；Direct quadrature up-conversion device handles the signal of root raised cosine root low-pass filter output；Radio-frequency power amplifier amplifies the signal of direct quadrature up-conversion device output.
Description
Technical field
The present invention relates to mobile communication technology fields, in particular to direct in a kind of Digital Clustering hand-held set
Up-converter system and its implementation.
Background technique
Traditional Digital Clustering hand-held set majority is using double conversion architecture, since there are two-stage mixing for it
Device, not only circuit is complicated, and it is at high cost, integrated level is not high, on the other hand, this structure needs higher power consumption.
With the development of software radio, there is zero intermediate frequency architecture.The core of this system is based on positive intermodulation
The direct quadrature up-conversion technology (DQUC) of system, it be baseband signal is directly modulated on radio-frequency carrier it is a kind of most directly and
Baseband signal directly can be moved radio-frequency carrier and eliminate useless sideband signals by simplest modulation system, to realize
Modulation.Its advantage is that not needing the circuits such as intermediate frequency filtering, amplification, frequency conversion, largely reduce transmitter itself
Volume, power consumption, cost.In realizing process of the present invention, at least there are the following problems in the prior art: zero intermediate frequency for inventor's discovery
Architecture is by being then based on orthogonal modulation, therefore, can generate serious local oscillator and sideband leakage.
Summary of the invention
It is an object of the invention to solve the problems of prior art, provide that a kind of structure is simple, realizes convenient, energy
Enough reduce local oscillator leakage and improve zero intermediate frequency system sideband inhibition effect Digital Clustering hand-held set in Direct conversion system
System.
To achieve the goals above, the invention adopts the following technical scheme:
A kind of Direct conversion system in Digital Clustering hand-held set, comprising:
Baseband signal processing module exports I/Q two-way orthogonal digital baseband signal；
I/Q two-way orthogonal digital baseband signal is converted to simulation i/q signal by binary channels Digital To Analog Convert；
Root-raised cosine low-pass wave device, has the function of pulse shaping and anti-ISI, defeated to binary channels Digital To Analog Convert
Simulation i/q signal out is handled；
Direct quadrature up-conversion device handles the signal of root raised cosine root low-pass filter output；Direct conversion
Module will be offset direct current biasing present in two-way, then need to only be made to reach using the device that differential signal processing can be achieved
The two paths of signals of frequency-variable module direct current biasing having the same, can suppressed carrier leakage；
Radio-frequency power amplifier amplifies the signal of direct quadrature up-conversion device output.
It in a preferred embodiment, further include single-ended transfer difference circuit, the output of the root-raised cosine low-pass wave device connects
Entering to single-ended transfer difference circuit conversion is differential signal, then is input to the Direct conversion device that can handle differential signal.
The present invention also provides the implementation methods of the Direct conversion system in Digital Clustering hand-held set, including following step
It is rapid:
(1) baseband processing module exports I/Q two-way orthogonal digital baseband signal；
(2) I/Q two-way orthogonal digital baseband signal is converted to simulation i/q signal by binary channels Digital To Analog Convert；
(3) after simulation i/q signal passes through root-raised cosine low-pass wave device respectively, it is sent into direct quadrature up-conversion device, is adjusted
It makes on radio-frequency carrier；
(4) simulation i/q signal is sent into radio-frequency power amplifier amplification, goes out eventually by aerial radiation.
Further, introducing one respectively in the I/Q two-way orthogonal digital baseband signal of baseband processing module output can
The direct current biasing parameter of adjusting observes carrier wave leakage situation by frequency spectrograph, constantly modifies above-mentioned two direct current biasing parameter,
Until carrier wave leakage minimizes, i.e. -30dBc, while the value of Error Vector Magnitude is down to 3.16%；Wherein, two direct currents are inclined
It is not identical to set parameter.
Further, by binary channels Digital To Analog Convert carry out digital-to-analogue conversion when, if simulation i/q signal amplitude and/
Or unbalance in phase, then by simulation i/q signal be finely adjusted so that simulation i/q signal amplitude and/or phase reach into
State before row digital-to-analogue conversion.
Design principle of the invention: for local oscillator leakage problem, mainly just giving in in-phase component for signal exists directly
Caused by stream offset；For sideband rejection ability, Amplitude balance and phase balance degree is to it with particularly important influence: phase error
Bigger with range error, sideband rejection ability is poorer.Therefore, local oscillator leakage is reduced or eliminated, the direct current to i/q signal is needed
Offset is controlled；Sideband rejection ability is improved, needs to improve the Amplitude balance and phase balance degree of i/q signal.
Compared with prior art, the invention has the following advantages:
The I/Q two-way orthogonal digital baseband signal that the present invention is exported by baseband processing module, in the I/Q letter of base band output
An adjustable direct current biasing parameter is introduced in number respectively, the two parameters are constantly modified, so that carrier wave leakage is down to most
It is low, so that suppressed carrier is revealed；On the other hand, present invention uses the root-raised cosine low-pass wave devices and list of anti-ISI
Slip parallel circuit is held, meanwhile, in conjunction with the technological means by being finely adjusted to the modulated data of number, with reality now into change
The improvement of the degree of balance both when frequency module, to achieve the purpose that sideband inhibits.
Detailed description of the invention
Fig. 1 is the principle of the present invention schematic diagram.
Fig. 2 is system structure diagram of the invention.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples, and embodiments of the present invention include but is not limited to
The following example.
The terms "and/or", only a kind of incidence relation for describing affiliated partner, indicates that there may be three kinds of passes
System, for example, A and/or B, can indicate: individualism A, individualism B exist simultaneously tri- kinds of situations of A and B, the terms
"/and " it is to describe another affiliated partner relationship, indicate may exist two kinds of relationships, for example, A/ and B, can indicate: individually depositing
In A, two kinds of situations of individualism A and B, in addition, character "/" herein, typicallying represent forward-backward correlation object is a kind of "or" pass
System.
Embodiment 1
For the problems of existing zero intermediate frequency architecture: local oscillator and sideband leakage present embodiments provide one kind
Direct conversion system in Digital Clustering hand-held set, which includes:
Baseband signal processing module exports I/Q two-way orthogonal digital baseband signal.
I/Q two-way orthogonal digital baseband signal is converted to simulation i/q signal by binary channels Digital To Analog Convert.
Root-raised cosine low-pass wave device, has the function of pulse shaping and anti-ISI, defeated to binary channels Digital To Analog Convert
Simulation i/q signal out is handled；Root-raised cosine low-pass wave device is used cooperatively with single-ended transfer difference circuit circuit, can be improved
The degree of balance of the amplitude and phase of I/Q two paths of signals.Specifically, the output of root-raised cosine low-pass wave device accesses to single-ended turn
Difference channel is converted to differential signal, and differential signal is input to the Direct conversion device that can handle differential signal again.
Direct quadrature up-conversion device handles the signal of root raised cosine root low-pass filter output.
Radio-frequency power amplifier amplifies the signal of direct quadrature up-conversion device output.
It should be noted that above-mentioned component is existing mature component, and therefore not to repeat here.
By above system, the discrimination extremely -38dBc between the carrier wave and useful signal of leakage, sideband signals can be made
Difference extremely-the 32dBc between useful signal, Error Vector Magnitude (EVM) can be lower than 3.16%, meet RF IC core
Requirement of the piece to Error Vector Magnitude index, so that receiving end is enough to isolate useful signal from the signal received.
Embodiment 2
A kind of Direct conversion method in Digital Clustering hand-held set is present embodiments provided, this method includes following step
It is rapid:
One, baseband processing module exports I/Q two-way orthogonal digital baseband signal；Local oscillator leakage is mainly just giving for signal
Caused by direct current offset in in-phase component, therefore, the I/Q two-way orthogonal digital base that the present embodiment is exported in baseband processing module
An adjustable direct current biasing parameter is introduced in band signal respectively, carrier wave leakage situation is observed by frequency spectrograph, is constantly repaired
Change above-mentioned two direct current biasing parameter, until carrier wave leakage minimizes.
Two, I/Q two-way orthogonal digital baseband signal is converted to simulation i/q signal by binary channels Digital To Analog Convert.
Three, after simulation i/q signal passes through root-raised cosine low-pass wave device respectively, it is sent into direct quadrature up-conversion device, is adjusted
It makes on radio-frequency carrier；Phase error and range error are bigger, and sideband rejection ability is poorer.For the width for guaranteeing I/Q two paths of signals
Degree and phase equilibrium, the present embodiment use the technological means that is finely adjusted to amplitude and phase, i.e., touch turn by binary channels number
When parallel operation carries out digital-to-analogue conversion, if the amplitude and/or unbalance in phase of simulation i/q signal, by being carried out to simulation i/q signal
Fine tuning, so that the amplitude and/or phase of simulation i/q signal reach the state before carrying out digital-to-analogue conversion.
Four, simulation i/q signal is sent into radio-frequency power amplifier amplification, goes out eventually by aerial radiation.
By the above method, an adjustable direct current biasing parameter is introduced respectively in the i/q signal of base band output, no
The two parameters are modified disconnectedly, so that carrier wave leakage minimizes, so that suppressed carrier is revealed；On the other hand, using to number
The technological means that modulated data are finely adjusted improves the flat of two paths of signals to reach the state before entering frequency-variable module
Weighing apparatus degree.
Embodiment 3
As shown in Figure 1, setting I (t) and Q (t) is orthogonal analog baseband signal, fOIt (t) is RF local oscillator signal, transmitter
When work, fO(t) orthogonal local oscillation signal f is first generated through phase-shifter phase shiftOI(t) and fOQ(t), then respectively with baseband signal I
(t) subtraction is done after being multiplied with Q (t), exports useful sideband signals.
As shown in Fig. 2, I, Q two paths of signals all introduce an adjustable direct current biasing parameter, test phase by using
Continuous sine wave observes carrier wave leakage situation in frequency spectrograph, constantly modifies the two parameters, be down to most until by the leakage
It is low.The specific method is as follows:
(1) after orthogonal modulation, I, Q two paths of data are stored in I_buffer [N] and Q_buffer [N] array respectively；
(2) M is added to each element in I_buffer array, is artificially introduced direct current biasing；
(3) N is added to each element in Q_buffer array, is artificially introduced the direct current biasing different from the road I；
(4) by each element or upper 0x1000 in I_buffer array；
(5) by each element or upper 0x8000 in Q_buffer array；
(6) digital analog converter carries out digital-to-analogue conversion to two paths of data.
If the unbalance in phase of I/Q two paths of signals, can will believe in baseband signal phase shift certain angle, the road Ji Jianggai all the way
The delay for number doing a unit, then carries out digital-to-analogue conversion together with another circuit-switched data.Such as: Q circuit-switched data is postponed, it can be with
Q_buffer data are proceeded as follows: Q_buffer [i]=Q_buffer [i+1]；It, can be to two-way if amplitude imbalance
Baseband signal does different amplitude transformation, such as: by a certain circuit-switched data in bit-level whole shift to right or left one or multiplied by
The modes such as one floating number.Continuous sine wave is used in test phase, frequency spectrograph Intermediate Side Band leak case is observed, constantly changes
Value in above-mentioned steps, by finely tuning repeatedly, so that it may minimize sideband leakage.
According to above-described embodiment, the present invention can be realized well.It is worth noting that before based on above-mentioned design principle
It puts, to solve same technical problem, even if some no realities made on the basis of structure or method disclosed in this invention
The change or polishing of matter, the essence of used technical solution is still as the present invention, therefore it should also be as of the invention
In protection scope.
Claims (1)
1. a kind of implementation method of the Direct conversion system in Digital Clustering hand-held set, which is characterized in that the frequency conversion system
Include: baseband signal processing module, exports I/Q two-way orthogonal digital baseband signal；
I/Q two-way orthogonal digital baseband signal is converted to simulation i/q signal by binary channels Digital To Analog Convert；
Root-raised cosine low-pass wave device, has the function of pulse shaping and anti-ISI, to the output of binary channels Digital To Analog Convert
Simulation i/q signal is handled；
Direct quadrature up-conversion device handles the signal of root-raised cosine low-pass wave device output；
Radio-frequency power amplifier amplifies the signal of direct quadrature up-conversion device output；
It further include single-ended transfer difference circuit, the output of the root-raised cosine low-pass wave device accesses to single-ended transfer difference circuit conversion
For differential signal；
The implementation method the following steps are included:
(1) baseband processing module exports I/Q two-way orthogonal digital baseband signal；
(2) I/Q two-way orthogonal digital baseband signal is converted to simulation i/q signal by binary channels Digital To Analog Convert；
(3) after simulation i/q signal passes through root-raised cosine low-pass wave device respectively, it is sent into direct quadrature up-conversion device, is modulated onto
On radio-frequency carrier；
(4) simulation i/q signal is sent into radio-frequency power amplifier amplification, goes out eventually by aerial radiation；
The hand-held set uses zero intermediate frequency architecture；
An adjustable direct current biasing is introduced respectively in the I/Q two-way orthogonal digital baseband signal of baseband processing module output
Parameter observes carrier wave leakage situation by frequency spectrograph, constantly modifies above-mentioned two direct current biasing parameter, until carrier wave leakage drops
It is extremely minimum；Wherein, two direct current biasing parameters are not identical；
When carrying out digital-to-analogue conversion by binary channels Digital To Analog Convert, if the amplitude and/or unbalance in phase of simulation i/q signal,
Then by being finely adjusted to simulation i/q signal, so that before the amplitude and/or phase of simulation i/q signal reach progress digital-to-analogue conversion
State.
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| CN109787660A (en) * | 2019-03-20 | 2019-05-21 | 上海诺潇智能科技有限公司 | A kind of base band signal producing means of RFID transmit circuit |
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| US8693525B2 (en) * | 2006-07-14 | 2014-04-08 | Qualcomm Incorporated | Multi-carrier transmitter for wireless communication |
| CN101657974B (en) * | 2007-04-25 | 2014-11-12 | 马来西亚电信公司 | Transceiver front end for software radio systems |
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| CN102624440A (en) * | 2012-04-11 | 2012-08-01 | 成都林海电子有限责任公司 | Method for testing satellite mobile communication terminal digital up-converter |
| CN103346810A (en) * | 2013-07-20 | 2013-10-09 | 福州大学 | Full-digital direct up-conversion circuit |
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