CN201114160Y - Multicarrier transmitter based on digital intermediate frequency technology - Google Patents
Multicarrier transmitter based on digital intermediate frequency technology Download PDFInfo
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- CN201114160Y CN201114160Y CNU2007200550577U CN200720055057U CN201114160Y CN 201114160 Y CN201114160 Y CN 201114160Y CN U2007200550577 U CNU2007200550577 U CN U2007200550577U CN 200720055057 U CN200720055057 U CN 200720055057U CN 201114160 Y CN201114160 Y CN 201114160Y
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Abstract
The utility model discloses a multi-carrier transmitter based on digital intermediate frequency technology. The utility model comprises a D/A converter, a RF emission subsystem, a clock subsystem, a microchip control subsystem, a PC, a baseband I/Q signal generator and a multi-carrier digital up-conversion subsystem, wherein a baseband I/Q signal generator subsystem is connected with the RF emission subsystem orderly through the multi-carrier digital up-conversion subsystem and the D/A converter; the PC is connected simultaneously with the baseband I/Q signal generator, the multi-carrier digital up-conversion subsystem, the D/A converter, the RF emission subsystem, the clock subsystem and the microchip control subsystem; the microchip control subsystem is connected simultaneously with the PC, the baseband I/Q signal generator, the multi-carrier digital up-conversion subsystem, the D/A converter, the RF emission subsystem and the clock subsystem. The utility model effectively improves the performance of the transmitter, greatly increases the flexibility and expansibility of a system, ensures the good feasibility of the system, and is easy to realize the miniaturized transmitter with low power consumption.
Description
Technical field
The utility model relates to moving communicating field, relates in particular to the multicarrier transmitter based on digital if technology.
Background technology
Along with the development of mobile communication, the tracking exchage amount also sharply increases, and operator has to that mobile communication system is carried out dilatation and handles, to satisfy the user's communications demand.Nowadays, communication system develops into multicarrier system by single carrier, and multi-carrier communications systems could satisfy the communicating requirement of current mobile communication subscriber.
In mobile communication is arranged net engineering design, before the arrangement base station, need an assessment accurately, assess out the place at cloth station and the coverage condition of signal, so the engineering staff needs a better signal transmitter of anolog base station.This emission function is exported the base station signal of corresponding system, carries out test analysis for the engineering staff, accurately assesses out the place at cloth station and the covering of signal.And, press for the analysis that corresponding multicarrier transmitter carries out the base station signal coverage condition along with the continuous arrangement and the application of Multi-Carrier basestation.
The continuous progress of the communication technology, also make current increasing communication products adopt digital technology to realize, as the frequency-selecting of adopting digital if technology to finish carrier wave is handled, so, along with the continuous application of Multi-Carrier basestation, need to support the transmitter of multicarrier processing capacity on the one hand, on the other hand, along with the requirement of user to small product size, power consumption aspect, product needed progressively develops to low-power consumption, miniaturization, microminiaturized direction.So, expand to multicarrier transmitter from the single carrier transmitter, the synthetic multicarrier transmitter that can not simply the cascade of single carrier transmitter be got up, and the function of single carrier transmitter should be merged and expand, form multicarrier transmitter.
In the single carrier transmitter, using more is single pass digital up converter, the main modulation that realizes the single channel data.In multicarrier transmitter, need use the multi-channel digital upconverter, present multichannel upconverter, generally can only support modulation, expand to the above system of 8 passages, need integrated a plurality of digital up converter the four-way data, can increase system cost on the one hand, on the other hand, be difficult for realizing the miniaturization of product, system power dissipation is bigger.
Traditional multi-channel digital upconverter generally only adopts the one-level Frequency mixing processing, makes the output signal frequency scope that certain restriction be arranged, and has limited the application scenario of transmitter.Each passage individual processing needs more hardware resource, especially some interpolation filter processing modules, can carry out adding up and handling after, and like this, multichannel can multiplexed resource, thus the resource of saving device.Add up and in the end one-level carry out because after Digital Up Convert handled, last data rate was very high, like this, accumulation process needs add tree support, needs more resource.
The utility model content
The purpose of this utility model is to overcome the shortcoming of prior art, and the multicarrier transmitter based on digital if technology is provided, and the utility model effectively reduces system cost, realizes the miniaturization of product, has reduced system power dissipation.
The purpose of this utility model is achieved through the following technical solutions: based on the multicarrier transmitter of digital if technology, comprise D/A converter, the radio-frequency transmissions subsystem, Clock Subsystem, microchip control subsystem and PC, baseband I, the Q signal generator, multi-carrier digital up-conversion subsystem, described baseband I, Q signal generator subsystem is successively by multi-carrier digital up-conversion subsystem, D/A converter links to each other with the radio-frequency transmissions subsystem, described PC and baseband I, Q signal takes place, multi-carrier digital up-conversion subsystem, D/A converter, the radio-frequency transmissions subsystem, Clock Subsystem, the microchip control subsystem connects simultaneously, described Clock Subsystem and PC, baseband I, Q signal takes place, multi-carrier digital up-conversion subsystem, D/A converter, the radio-frequency transmissions subsystem, Clock Subsystem, the microchip control subsystem connects simultaneously, described microchip control subsystem and PC, baseband I, Q signal takes place, multi-carrier digital up-conversion subsystem, D/A converter, the radio-frequency transmissions subsystem, Clock Subsystem connects simultaneously.
Described baseband I, Q signal generator comprise protocol resolver, signal generator and formed filter; The output of described protocol resolver is connected successively with signal generator, formed filter.
Described radio-frequency transmissions subsystem comprises band pass filter, simulation ATT, amplifier, frequency mixer, local oscillator LO and radio-frequency filter, described band pass filter is connected with radio-frequency filter by simulation ATT, amplifier, frequency mixer successively, and described local oscillator LO is connected with frequency mixer.
Described multi-carrier digital up-conversion subsystem comprises a plurality of first order interpolation filter groups, multichannel NCO generation module, first order complex modulation and signal accumulation process module, second level interpolation filter group, second level complex modulation processing module, third level quadrature modulation processing module, gain adjustment module, local oscillator suppresses module, described a plurality of first order interpolation filter group output is in proper order by first order complex modulation and signal accumulation process module, second level interpolation filter group, second level complex modulation processing module, third level quadrature modulation processing module, gain adjustment module suppresses module input with local oscillator and is connected, described a plurality of first order interpolation filter group connects one to one with a plurality of channel data output signals respectively, and described multichannel NCO generation module output is connected with the accumulation process module input with first order complex modulation.Described multi-carrier digital up-conversion subsystem also comprises 2 single channel NCO generation modules, the output of one of them single channel NCO generation module is connected with the input of second level complex modulation processing module, and the output of another single channel NCO generation module is connected with the input of third level quadrature modulation processing module.
Described multi-carrier digital up-conversion subsystem can also following mode be realized: described multi-carrier digital up-conversion subsystem comprises data and goes here and there the conversion process module, first order interpolation filter group, multichannel NCO generation module, first order complex modulation and signal accumulation process module, second level interpolation filter group, second level complex modulation processing module, third level quadrature modulation processing module, gain adjustment module, local oscillator suppresses module, the described data and the conversion process sequence of modules of going here and there are by first order interpolation filter group, first order complex modulation and signal accumulation process module, second level interpolation filter group, second level complex modulation processing module, third level quadrature modulation processing module, gain adjustment module suppresses module input with local oscillator and is connected, and the described data and the conversion process module of going here and there are connected with a plurality of channel data output signals.Described multi-carrier digital up-conversion subsystem also comprises 2 single channel NCO generation modules, the output of one of them single channel NCO generation module is connected with the input of second level complex modulation processing module, and the output of another single channel NCO generation module is connected with the input of third level quadrature modulation processing module.
Described first order complex modulation and signal accumulation process module comprise a plurality of modulation accumulator module, and described modulation accumulator module comprises I, Q signal delay process module, accumulator and add up back I, Q signal delay process module after I behind NCO signal lag processing module, the interpolation filter, Q signal delay process module, multiplier, the mixing; I, Q signal delay process module, accumulator and the back I that adds up, Q signal delay process module are connected successively after the NCO signal lag processing module of described multichannel NCO generation module and a plurality of modulation accumulator module, multiplier, the mixing; I, Q signal delay process module, accumulator and the back I that adds up, Q signal delay process module are connected successively after the I of described first order interpolation filter group and a plurality of modulation accumulator module, Q signal delay process module, multiplier, the mixing; The back I that adds up, Q signal delay process module in the described last modulation accumulator module are connected with the accumulator that modulate in the accumulator module back one.
Described first order interpolation filter group or second level interpolation filter group are made up of one, two or three interpolation filters; Described interpolation filter is FIR, IIR, CIC or partly is with interpolation filter.
Described second level complex modulation processing module comprises 4 multipliers and 2 adders, described 4 multipliers are connected with I, Q signal output and a single channel NCO generation module of second level interpolation filter group respectively, 2 multiplier outputs and being connected on the adder wherein, other 2 multiplier outputs also are connected on another adder; Described third level quadrature modulation processing module comprises 2 multipliers and 1 subtracter, between described 2 multipliers and be connected with subtracter, another single channel NCO generation module.The input of one multiplier of described third level quadrature modulation processing module is connected with a multiplier output of second level complex modulation processing module, and the input of another multiplier of described third level quadrature modulation processing module is connected with another multiplier output of second level complex modulation processing module.
The utility model compared with prior art has following advantage and beneficial effect:
1, the multi-carrier digital up-conversion subsystem in the utility model has adopted the processing mode that combines of complex modulation and quadrature modulation, guarantee I, the consistency of Q signal amplitude and the orthogonality of phase place, thereby good restraining is born image signal frequently, has improved the performance of transmitter;
2, the multi-carrier digital up-conversion subsystem in the utility model provides three grades of Frequency mixing processing, can export the carrier wave of optional frequency combination, has enlarged the scope of application of system;
3, the multi-carrier digital up-conversion subsystem in the utility model helps adopting such as the realization of programmable logic devices such as FPGA, CPLD, EPLD, DSP, and port number can increase and decrease with application demand, has increased the flexibility and the extensibility of system greatly;
4, the present device of the utility model combination is restricted, has proposed Corresponding improvement methods, and the system that makes has good feasibility, is easy to realize the multicarrier transmitter of miniaturization, low-power consumption.
Description of drawings
Fig. 1 is the structural representation of the multicarrier transmitter based on digital intermediate frequency of the present utility model;
Fig. 2 is the structural representation of baseband I of the present utility model, Q signal generator;
Fig. 3 is the structural representation of a kind of multi-carrier digital up-conversion subsystem that the utility model proposes;
Fig. 4 is the structural representation of the another kind of multi-carrier digital up-conversion subsystem that the utility model proposes;
Fig. 5 is the first order complex modulation and the signal accumulation process modular structure figure of multi-carrier digital up-conversion subsystem;
The second level complex modulation that Fig. 6 is adopted for multi-carrier digital up-conversion subsystem and the schematic diagram of third level quadrature modulation;
Fig. 7 is a N passage NCO serial output mode schematic diagram;
Fig. 8 is the parallel output mode schematic diagram of N passage NCO;
Fig. 9 is a N passage NCO burst mode NCO output timing schematic diagram;
The radio-frequency transmissions subsystem theory diagram that Figure 10 is in the utility model to be adopted.
Embodiment
Below in conjunction with embodiment and accompanying drawing the utility model is described in further detail, but execution mode of the present utility model is not limited thereto.
Embodiment
Multicarrier transmitter as shown in Figure 1 based on digital intermediate frequency, it comprises D/A converter, the radio-frequency transmissions subsystem, Clock Subsystem, microchip control subsystem and PC, baseband I, the Q signal generator, multi-carrier digital up-conversion subsystem, described baseband I, Q signal generator subsystem is successively by multi-carrier digital up-conversion subsystem, D/A converter links to each other with the radio-frequency transmissions subsystem, described PC and baseband I, Q signal takes place, multi-carrier digital up-conversion subsystem, D/A converter, the radio-frequency transmissions subsystem, Clock Subsystem, the microchip control subsystem connects simultaneously, described Clock Subsystem and PC, baseband I, Q signal takes place, multi-carrier digital up-conversion subsystem, D/A converter, the radio-frequency transmissions subsystem, Clock Subsystem, the microchip control subsystem connects simultaneously, described microchip control subsystem and PC, baseband I, Q signal takes place, multi-carrier digital up-conversion subsystem, D/A converter, the radio-frequency transmissions subsystem, Clock Subsystem connects simultaneously.
Radio-frequency transmissions subsystem wherein, as shown in figure 10, comprise band pass filter, simulation ATT, amplifier, frequency mixer, local oscillator LO and radio-frequency filter, described band pass filter is connected with radio-frequency filter by simulation ATT, amplifier, frequency mixer successively, and described local oscillator LO is connected with frequency mixer.The radio-frequency transmissions subsystem adopts the single-conversion technology, simplifies circuit design, and reduces system cost.In order to reduce the requirement to the front end D/A converter, the intermediate-freuqncy signal frequency range that Radio Frequency Subsystem receives is limited to 60MHz～200MHz, is convenient to the design and the realization of Radio Frequency Subsystem and Digital IF Processing system.The radio-frequency transmissions subsystem, wherein amplifier can be made up of LNA, power amplifier etc.Though the formation more complicated of Radio Frequency Subsystem, such processing, making does not need superfast sampling by the broadband analog if signal that output bandwidth is moderate, and follow-up A/D conversion process can be simplified greatly, has good feasibility.
Wherein D/A converter is one of key modules in the multicarrier transmitter, realizes the digital-to-analogue conversion of digital medium-frequency signal is handled the output analog if signal.D/A converter conversion accuracy and intermodulation index have very big influence to the performance of transmitter.So, need reasonably select corresponding D/A transducer according to the application demand of transmitter.
Clock Subsystem provides reference clock signal for each subsystem and the module in the whole transmitter, and the Clock management of responsible digital transmitter and distribution, processing such as the frequency division of realization clock, frequency multiplication.
The control and the working state monitoring of the whole digital transmitter mode of operation of microchip control (MCU) subsystem responsible.Can monitor and alarming processing with each submodule of receiver system by system bus.If a certain subsystem or operation irregularity appears in submodule, carry out system reset and handle and carry out alarm report and handle.The MCU subsystem also program of whole system is downloaded and is upgraded, as the download of FPGA, DSP program.
PC can be controlled arbitrary subsystem of whole transmitter, realizes configuration and modification to some parameters in the system, as the reference clock that can dispose whole system, output frequency, the power output of revising multi-carrier digital up-conversion subsystem.For 3G transmitters such as WCDMA, TD-SCDMA, CDMA2000, can also export scrambler number etc.
As shown in Figure 2, baseband I, Q signal generator function are to produce zero intermediate frequency I, the Q signal that conformance with standard communication protocol requires.Baseband I, Q signal generator as the GSM system need produce the tdma frame signal that meets gsm protocol, and data are encoded and the GMSK modulation treatment, form digital baseband I, Q signal.Baseband I, Q signal generator comprise three subsystems: protocol resolver, signal generator and formed filter.The output of protocol resolver is connected successively with signal generator, formed filter.Protocol resolver mainly according to the standard agreement standard of being announced of different communication system, generates the control signal that protocol compliant requires.Signal generator receives the control signal from protocol resolver, forms baseband I, the Q signal of conformance with standard protocol specification.Formed filter carries out moulding and Filtering Processing according to the transmitter requirement to baseband I, Q signal, the filtered baseband I of output moulding, Q signal.Because formed filter is also handled in the frequency conversion system in number, so, according to the actual conditions of system requirements and design, can not comprise formed filter in baseband I, the Q signal generator, and formed filter is embedded in the Digital Up Convert subsystem.
As shown in Figure 3, the multi-carrier digital up-conversion subsystem that the utility model proposes, comprise a plurality of first order interpolation filter groups, multichannel NCO generation module, first order complex modulation and signal accumulation process module, second level interpolation filter group, second level complex modulation processing module, third level quadrature modulation processing module, gain adjustment module, local oscillator suppresses module, described a plurality of first order interpolation filter group output is in proper order by first order complex modulation and signal accumulation process module, second level interpolation filter group, second level complex modulation processing module, third level quadrature modulation processing module, gain adjustment module suppresses module input with local oscillator and is connected, described a plurality of first order interpolation filter group connects one to one with a plurality of channel data output signals respectively, and described multichannel NCO generation module output is connected with the accumulation process module input with first order complex modulation.
As shown in Figure 4, the another kind of multi-carrier digital up-conversion subsystem that the utility model proposes, comprise data and go here and there the conversion process module, first order interpolation filter group, multichannel NCO generation module, first order complex modulation and signal accumulation process module, second level interpolation filter group, second level complex modulation processing module, third level quadrature modulation processing module, gain adjustment module, local oscillator suppresses module, the described data and the conversion process sequence of modules of going here and there are by first order interpolation filter group, first order complex modulation and signal accumulation process module, second level interpolation filter group, second level complex modulation processing module, third level quadrature modulation processing module, gain adjustment module suppresses module input with local oscillator and is connected, and the described data and the conversion process module of going here and there are connected with a plurality of channel data output signals.In the Digital Up Convert subsystem that Fig. 4 proposes to the multi-channel data output signal, be data channel 1, data channel 2 ... the I of data channel N and line output, Q data have been carried out the data and the conversion process of going here and there, parallel data with output, be converted to I, the Q data flow of serial, like this, just can use same interpolation filter group to finish interpolation and Filtering Processing to N passage I, Q data.Therefore, such processing mode has improved the utilization rate of first order interpolation filter group, thereby has saved the utilization of resources.
As Fig. 3 or shown in Figure 4,2 kinds of multi-carrier digital up-conversion subsystems that the utility model proposes, also comprise 2 single channel NCO generation modules, the output of one of them single channel NCO generation module is connected with the input of second level complex modulation processing module, and the output of another single channel NCO generation module is connected with the input of third level quadrature modulation processing module; Described first order interpolation filter group or second level interpolation filter group are made up of one, two or three interpolation filters; Described interpolation filter is FIR, IIR, CIC or partly is with interpolation filter;
As shown in Figure 5, first order complex modulation and signal accumulation process module comprise a plurality of modulation accumulator module; Described first order complex modulation and signal accumulation process module comprise a plurality of modulation accumulator module, and described modulation accumulator module comprises I, Q signal delay process module, accumulator and add up back I, Q signal delay process module after I behind NCO signal lag processing module, the interpolation filter, Q signal delay process module, multiplier, the mixing; I, Q signal delay process module, accumulator and the back I that adds up, Q signal delay process module are connected successively after the NCO signal lag processing module of described multichannel NCO generation module and a plurality of modulation accumulator module, multiplier, the mixing; I, Q signal delay process module, accumulator and the back I that adds up, Q signal delay process module are connected successively after the I of described first order interpolation filter group and a plurality of modulation accumulator module, Q signal delay process module, multiplier, the mixing; The back I that adds up, Q signal delay process module in the described last modulation accumulator module are connected with the accumulator that modulate in the accumulator module back one.
As shown in Figure 6, second level complex modulation processing module comprises 4 multipliers and 2 adders, described 4 multipliers are connected with I, Q signal output and a single channel NCO generation module of second level interpolation filter group respectively, 2 multiplier outputs and being connected on the adder wherein, other 2 multiplier outputs also are connected on another adder; Described third level quadrature modulation processing module comprises 2 multipliers and 1 subtracter, between described 2 multipliers and be connected with subtracter, another single channel NCO generation module.The input of one multiplier of described third level quadrature modulation processing module is connected with a multiplier output of second level complex modulation processing module, and the input of another multiplier of described third level quadrature modulation processing module is connected with another multiplier output of second level complex modulation processing module.
In conjunction with Fig. 1, Fig. 3, Fig. 5, shown in Figure 6, the utility model may further comprise the steps based on a kind of multicarrier launching technique of the multicarrier transmitter of digital if technology:
(1) baseband I, Q signal generator output zero intermediate frequency I, Q signal are to multi-carrier digital up-conversion subsystem, multi-carrier digital up-conversion subsystem carries out interpolation, filtering, mixing and modulation treatment to the baseband signal that baseband I, Q signal generator produce, baseband signal is moved on the different Frequency points, and the multi-carrier digital intermediate-freuqncy signal of output different frequent points is to D/A converter
(2) D/A converter carries out the digital-to-analogue conversion processing to digital medium-frequency signal, and the output analog if signal is to Radio Frequency Subsystem, and Radio Frequency Subsystem is handled the moderate broadband analog if signal of output bandwidth to analog signal;
Multi-carrier digital up-conversion subsystem carries out interpolation, filtering, mixing and modulation treatment to the baseband signal that baseband I, Q signal generator produce in the described step (1), baseband signal is moved on the different Frequency points, the multi-carrier digital intermediate-freuqncy signal of output different frequent points may further comprise the steps to D/A converter:
(A) a plurality of channel data output output I, the Q data of baseband I, Q signal generator are carried out interpolation of data and Filtering Processing to first order interpolation filter group;
(B) local oscillation signal that generates of data behind the interpolation filtering and multichannel NCO generation module is sent to first order complex modulation and signal accumulation process module is carried out first order mixing in the lump, modulation treatment and accumulating operation, its process is: the cos of multichannel NCO generation module output and sin signal local oscillation signal carry out N through NCO signal lag processing module (wherein N are provided with according to concrete needs, for example: N=1～16) individual clk cycle delay is handled, I behind the first order interpolation filtering, the Q data are through I, Q signal delay process module is carried out M, and (wherein M is provided with according to concrete needs, for example: M=1～16) individual clk cycle delay is handled, through local oscillation signal and the I after the delay processing, the Q data-signal is input to multiplier respectively and carries out Frequency mixing processing, pass through I after the mixing after the Frequency mixing processing again, Q signal delay process module is carried out P, and (wherein P is provided with according to concrete needs, for example: P=1～16) individual clk cycle delay is sent to adder after handling, simultaneously, another port of the adder of back one-level is accepted adding up and the result from previous stage, the signal of afterbody output after ovennodulation adds up, and the signal of back output after ovennodulation adds up; As can be seen from Figure 5, adopted the multiply accumulating processing mode of chain type cascade, overcome the long shortcoming of carry chain of traditional add tree structure, guaranteed that the design bottleneck of system can not appear on the accumulation process.And this processing mode has also made full use of the resource of each device, as multiplier, adder etc., has improved the resource utilization of system greatly.
(C) I, the Q data after adding up are input to second level interpolation filter group and carry out partial interpolation and Filtering Processing, and the I behind the interpolation filtering, Q data are input to second level complex modulation processing module and third level quadrature modulation processing module again and carry out that second level complex modulation is handled and third level quadrature modulation is handled; It is that I, Q data are successively through 4 multiplication and 2 accumulation process that described second level complex modulation is handled; The complex modulation of I, Q data is to carry out 4 multiplication and twice accumulation process by the multiplier of second level complex modulation processing module and accumulator, signal after the complex modulation carries out quadrature modulation by third level quadrature modulation processing module again, signal after the output modulation at last, the modulation of employing two-stage can well suppress negative mirror image frequently.In addition, because generally will being sent to the D/A digital to analog converter, the signal after ovennodulation carries out the digital-to-analogue conversion processing, and D/A generally has the quadrature modulation processing, so, quadrature modulation in the utility model can be handled and carry out the bypass processing, directly utilize the quadrature modulation processing among the D/A also can realize similar function.
(D) signal after ovennodulation is exported I, Q signal that the compliance with system gain requires through gain adjustment module, and is last, and I, Q signal carry out the inhibition of direct current local-oscillator leakage and carrier leak through local oscillator inhibition processing module again, export final modulation signal.
In conjunction with Fig. 1, Fig. 4, Fig. 5, shown in Figure 6, the utility model may further comprise the steps based on the another kind of multicarrier launching technique of the multicarrier transmitter of digital if technology:
(1) baseband I, Q signal generator output zero intermediate frequency I, Q signal are to multi-carrier digital up-conversion subsystem, multi-carrier digital up-conversion subsystem carries out interpolation, filtering, mixing and modulation treatment to the baseband signal that baseband I, Q signal generator produce, baseband signal is moved on the different Frequency points, and the multi-carrier digital intermediate-freuqncy signal of output different frequent points is to D/A converter
(2) D/A converter carries out the digital-to-analogue conversion processing to digital medium-frequency signal, and the output analog if signal is to Radio Frequency Subsystem, and Radio Frequency Subsystem is handled the moderate broadband analog if signal of output bandwidth to analog signal;
Multi-carrier digital up-conversion subsystem carries out interpolation, filtering, mixing and modulation treatment to the baseband signal that baseband I, Q signal generator produce in the described step (1), baseband signal is moved on the different Frequency points, the multi-carrier digital intermediate-freuqncy signal of output different frequent points may further comprise the steps to D/A converter:
(a) a plurality of channel data outputs of baseband I, Q signal generator and line output I, Q data to data parallel serial conversion module, to walk abreast I, the Q data of input of data parallel serial conversion module are converted to serial data stream, and serial data is carried out interpolation of data and Filtering Processing through first order interpolation filter group;
(b) local oscillation signal that generates of data behind the interpolation filtering and multichannel NCO generation module is sent to first order complex modulation and signal accumulation process module is carried out first order mixing in the lump, modulation treatment and accumulating operation, its process is: the cos of multichannel NCO generation module output and sin signal local oscillation signal carry out N through NCO signal lag processing module (wherein N are provided with according to concrete needs, for example: N=1～16) individual clk cycle delay is handled, I behind the first order interpolation filtering, the Q data are through I, Q signal delay process module is carried out M, and (wherein M is provided with according to concrete needs, for example: M=1～16) individual clk cycle delay is handled, through local oscillation signal and the I after the delay processing, the Q data-signal is input to multiplier respectively and carries out Frequency mixing processing, pass through I after the mixing after the Frequency mixing processing again, Q signal delay process module is carried out P, and (wherein P is provided with according to concrete needs, for example: P=1～16) individual clk cycle delay is sent to adder after handling, simultaneously, another port of the adder of back one-level is accepted adding up and the result from previous stage, the signal of afterbody output after ovennodulation adds up, and the signal of back output after ovennodulation adds up; As can be seen from Figure 5, adopted the multiply accumulating processing mode of chain type cascade, overcome the long shortcoming of carry chain of traditional add tree structure, guaranteed that the design bottleneck of system can not appear on the accumulation process.And this processing mode has also made full use of the resource of each device, as multiplier, adder etc., has improved the resource utilization of system greatly.
(c) I, the Q data after adding up are input to second level interpolation filter group and carry out partial interpolation and Filtering Processing, and the I behind the interpolation filtering, Q data are input to second level complex modulation processing module and third level quadrature modulation processing module again and carry out that second level complex modulation is handled and third level quadrature modulation is handled; It is that I, Q data are successively through 4 multiplication and 2 accumulation process that described second level complex modulation is handled; The complex modulation of I, Q data is to carry out 4 multiplication and twice accumulation process by the multiplier of second level complex modulation processing module and accumulator, signal after the complex modulation carries out quadrature modulation by third level quadrature modulation processing module again, signal after the output modulation at last, the modulation of employing two-stage can well suppress negative mirror image frequently.In addition, because generally will being sent to the D/A digital to analog converter, the signal after ovennodulation carries out the digital-to-analogue conversion processing, and D/A generally has the quadrature modulation processing, so, quadrature modulation in the utility model can be handled and carry out the bypass processing, directly utilize the quadrature modulation processing among the D/A also can realize similar function.
(d) signal after ovennodulation is exported I, Q signal that the compliance with system gain requires through gain adjustment module, and is last, and I, Q signal carry out the inhibition of direct current local-oscillator leakage and carrier leak through local oscillator inhibition processing module again, export final modulation signal.
In multicarrier up-conversion subsystem,, need to adopt interpolation of data to handle, but interpolation can be introduced the mirror image composition, need carry out filtering in order to improve the transmission rate of parallel input data.The interpolation of corresponding high multiple is handled, and in order to reduce the difficulty of Design of Filter, saves device resource, generally will adopt multistage interpolation filter cascade to realize.First order interpolation filter group in the system and second level interpolation filter group generally all are made up of one or two interpolation filter, in particular cases, can adopt three interpolation filters to constitute the interpolation filter group.Wherein, interpolation filter can be for FIR, IIR and CIC, partly be with interpolation filter etc.Need realize the processing of 16 haplotype data interpolations as system's first order interpolation, can adopt 4 times of CIC interpolations and FIR interpolation to realize for 4 times, can adopt and directly utilize FIR to realize 16 times of processing of interpolation, also can adopt 2 times of half-band filter interpolations, 2 times of CIC interpolations and FIR interpolation to realize for 4 times.
Multichannel NCO generation module mainly realizes generating multichannel digital sin and cos signal, for first order complex modulation processing module provides the local oscillator reference signal.Wherein, multichannel NCO generation module can be exported the local oscillation signal of multiple sequential, as serial output mode (see figure 7), parallel output mode (see figure 8) and burst mode (see figure 9), the signal output timing of the serial output mode of N passage NCO under each clock cycle clk triggers, successively output channel 1, passage 2 ..., passage N the NCO data.The signal output timing of the parallel output mode of N passage NCO under each clock cycle clk triggers, passage 1, passage 2 ..., passage N exports the NCO data of respective channel number simultaneously.The signal output timing of the burst output mode of N passage NCO is under each clock cycle clk triggers, (the individual cycle of M=1～N) is the NCO data of output channel 1 constantly for M, the NCO data of M cycle output channel 1 afterwards, and the like, the NCO data of last M cycle output channel N.
In traditional multi-carrier digital up-conversion subsystem, add up and in the end one-level carry out, because after Digital Up Convert is handled, Shu Chu data rate is very high at last, like this, accumulation process needs add tree support, needs more resource, if and under the low speed situation, carry out accumulation process, can adopt time-multiplexed processing mode to economize on resources.The utility model is placed on multi channel signals accumulation process module after first order interpolation and the complex modulation processing module, like this, because through first order interpolation filtering, data rate is not very high, like this, just can adopt the mode of time division multiplex resources to realize accumulating operation, realize the summation processing economizing on resources greatly and need not traditional add tree framework.Data after adding up and the data that comprised each passage, follow-up interpolation and modulation treatment, be equivalent to the signal of a passage is handled, through adding up summation module, be single pass upconversion process, simplified follow-up interpolation filtering and modulation treatment multichannel Digital Up Convert treatment conversion.
Multi-carrier digital up-conversion subsystem, for further optimal design, improve the reusability of resource, first order complex modulation processing module and multi channel signals accumulation process module are combined, utilize a kind of more special version to realize, to reach when carrying out complex modulation, modulation signal is carried out accumulation process, be that the signal after the exportable process modulation adds up and the result at last.
In multi-carrier digital up-conversion subsystem, the signal of output after the modulation is carried out gain-adjusted and control, to satisfy in the system design control requirement to signal input, output gain.Gain adjustment module has been opened some user interfaces, so that the user can revise system gain arbitrarily according to requirement of system design.
The local oscillator of multi-carrier digital up-conversion subsystem suppresses module and suppresses to realize offsetting upconversion process, because direct current signal and carrier leak signal that Design Treatment etc. are introduced improve systematic function.In number in the frequency-conversion processing, unavoidably can introduce direct current signal, can adopt " symmetry rounds off " processing method to suppress direct current leakage, also can adopt the inhibition of the method realization of DC filtering to direct current, can also adopt other method to carry out the inhibition of direct current, as ask for the average of signal, signal is compensated processing.And in multicarrier up-conversion subsystem, the carrier leak of each frequency correspondence also can be brought bigger influence to systematic function, so, need suppress to handle to the carrier leak signal, to reduce the interference of carrier leak to other passages.
The multi-carrier digital up-conversion subsystem that the utility model proposed can utilize programmable logic devices such as CPLD, FPGA, EPLD, DSP to realize, also can use special-purpose asic chip to realize.The utility model can be applied in the communication system systems such as GSM, CDMA, WCDMA, TD-SCDMA, CDMA2000.
Claims (9)
1, multicarrier transmitter based on digital if technology, comprise D/A converter, the radio-frequency transmissions subsystem, Clock Subsystem, microchip control subsystem and PC, it is characterized in that, also comprise baseband I, the Q signal generator, multi-carrier digital up-conversion subsystem, described baseband I, Q signal generator subsystem is successively by multi-carrier digital up-conversion subsystem, D/A converter links to each other with the radio-frequency transmissions subsystem, described PC and baseband I, Q signal takes place, multi-carrier digital up-conversion subsystem, D/A converter, the radio-frequency transmissions subsystem, Clock Subsystem, the microchip control subsystem connects simultaneously, described Clock Subsystem and PC, baseband I, Q signal takes place, multi-carrier digital up-conversion subsystem, D/A converter, the radio-frequency transmissions subsystem, Clock Subsystem, the microchip control subsystem connects simultaneously, described microchip control subsystem and PC, baseband I, Q signal takes place, multi-carrier digital up-conversion subsystem, D/A converter, the radio-frequency transmissions subsystem, Clock Subsystem connects simultaneously.
2, multicarrier transmitter based on digital if technology according to claim 1, it is characterized in that, described multi-carrier digital up-conversion subsystem comprises a plurality of first order interpolation filter groups, multichannel NCO generation module, first order complex modulation and signal accumulation process module, second level interpolation filter group, second level complex modulation processing module, third level quadrature modulation processing module, gain adjustment module, local oscillator suppresses module, described a plurality of first order interpolation filter group output is in proper order by first order complex modulation and signal accumulation process module, second level interpolation filter group, second level complex modulation processing module, third level quadrature modulation processing module, gain adjustment module suppresses module input with local oscillator and is connected, described a plurality of first order interpolation filter group connects one to one with a plurality of channel data output signals respectively, and described multichannel NCO generation module output is connected with the accumulation process module input with first order complex modulation.
3, multicarrier transmitter based on digital if technology according to claim 1, it is characterized in that, described multi-carrier digital up-conversion subsystem comprises data and goes here and there the conversion process module, first order interpolation filter group, multichannel NCO generation module, first order complex modulation and signal accumulation process module, second level interpolation filter group, second level complex modulation processing module, third level quadrature modulation processing module, gain adjustment module, local oscillator suppresses module, the described data and the conversion process sequence of modules of going here and there are by first order interpolation filter group, first order complex modulation and signal accumulation process module, second level interpolation filter group, second level complex modulation processing module, third level quadrature modulation processing module, gain adjustment module suppresses module input with local oscillator and is connected, and the described data and the conversion process module of going here and there are connected with a plurality of channel data output signals.
4, the multicarrier transmitter based on digital if technology according to claim 1 is characterized in that, described baseband I, Q signal generator comprise protocol resolver, signal generator and formed filter; The output of described protocol resolver is connected successively with signal generator, formed filter.
5, the multicarrier transmitter based on digital if technology according to claim 1, it is characterized in that, described radio-frequency transmissions subsystem comprises band pass filter, simulation ATT, amplifier, frequency mixer, local oscillator LO and radio-frequency filter, described band pass filter is connected with radio-frequency filter by simulation ATT, amplifier, frequency mixer successively, and described local oscillator LO is connected with frequency mixer.
6, according to claim 2 or 3 described multicarrier transmitters based on digital if technology, it is characterized in that, also comprise 2 single channel NCO generation modules, the output of one of them single channel NCO generation module is connected with the input of second level complex modulation processing module, and the output of another single channel NCO generation module is connected with the input of third level quadrature modulation processing module.
7, according to claim 2 or 3 described multicarrier transmitters based on digital if technology, it is characterized in that, described first order complex modulation and signal accumulation process module comprise a plurality of modulation accumulator module, and described modulation accumulator module comprises I, Q signal delay process module, accumulator and add up back I, Q signal delay process module after I behind NCO signal lag processing module, the interpolation filter, Q signal delay process module, multiplier, the mixing; I, Q signal delay process module, accumulator and the back I that adds up, Q signal delay process module are connected successively after the NCO signal lag processing module of described multichannel NCO generation module and a plurality of modulation accumulator module, multiplier, the mixing; I, Q signal delay process module, accumulator and the back I that adds up, Q signal delay process module are connected successively after the I of described first order interpolation filter group and a plurality of modulation accumulator module, Q signal delay process module, multiplier, the mixing; The back I that adds up, Q signal delay process module in the described last modulation accumulator module are connected with the accumulator that modulate in the accumulator module back one.
According to claim 2 or 3 described multicarrier transmitters, it is characterized in that 8, described first order interpolation filter group or second level interpolation filter group are made up of one, two or three interpolation filters based on digital if technology; Described interpolation filter is FIR, IIR, CIC or partly is with interpolation filter.
9, according to claim 2 or 3 described multicarrier transmitters based on digital if technology, it is characterized in that, described second level complex modulation processing module comprises 4 multipliers and 2 adders, described 4 multipliers are connected with I, Q signal output and a single channel NCO generation module of second level interpolation filter group respectively, 2 multiplier outputs and being connected on the adder wherein, other 2 multiplier outputs also are connected on another adder; Described third level quadrature modulation processing module comprises 2 multipliers and 1 subtracter, between described 2 multipliers and be connected with subtracter, another single channel NCO generation module.The input of one multiplier of described third level quadrature modulation processing module is connected with a multiplier output of second level complex modulation processing module, and the input of another multiplier of described third level quadrature modulation processing module is connected with another multiplier output of second level complex modulation processing module.
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| CNU2007200550577U CN201114160Y (en) | 2007-07-31 | 2007-07-31 | Multicarrier transmitter based on digital intermediate frequency technology |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103517005A (en) * | 2012-06-18 | 2014-01-15 | 北京昆腾微电子有限公司 | Integrated wireless audio and video transmission chip and transmission method thereof |
| WO2016145837A1 (en) * | 2015-03-17 | 2016-09-22 | 华为技术有限公司 | Signal frequency conversion circuit and signal frequency conversion method |
| CN107193000A (en) * | 2017-05-19 | 2017-09-22 | 矽力杰半导体技术(杭州)有限公司 | Object features detection means and method |
-
2007
- 2007-07-31 CN CNU2007200550577U patent/CN201114160Y/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103517005A (en) * | 2012-06-18 | 2014-01-15 | 北京昆腾微电子有限公司 | Integrated wireless audio and video transmission chip and transmission method thereof |
| WO2016145837A1 (en) * | 2015-03-17 | 2016-09-22 | 华为技术有限公司 | Signal frequency conversion circuit and signal frequency conversion method |
| US9780729B2 (en) | 2015-03-17 | 2017-10-03 | Huawei Technologies Co., Ltd. | Signal frequency conversion circuit and signal frequency conversion method |
| CN107193000A (en) * | 2017-05-19 | 2017-09-22 | 矽力杰半导体技术(杭州)有限公司 | Object features detection means and method |
| US11209468B2 (en) | 2017-05-19 | 2021-12-28 | Silergy Semiconductor Technology (Hangzhou) Ltd | Apparatus and method for detecting object features |
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