CN101500100B - Fusion implementation architecture for national standard digital television ground broadcast demodulator - Google Patents
Fusion implementation architecture for national standard digital television ground broadcast demodulator Download PDFInfo
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Abstract
The invention discloses a demodulator fusion realization architecture of a nationwide standard digital television terrestrial broadcast receiver, which comprises a analog-to-digital conversion module, a midfrequency processing module, a PN data separation module, a blind mode detection module, a channel estimate module, an interference cancellation module, a first general time-frequency transformation processing module, a second general time-frequency transformation processing module and a frequency-domain equalizing module; signals after frequency-domain equalizing are controlled by a first select switch to be input to a multicarrier transformation processing module so as to form frequency-domain multicarrier signals meeting the multicarrier standards, and then enter a QAM demodulation and channel decoding module by a second select switch; or the signals after frequency-domain equalizing are controlled by the first select switch to be input to a third general time-frequency transformation processing module so as to form time-domain single carrier signals meeting the single carrier standards, and then enter the QAM demodulation and channel decoding module by the second select switch to form MPEG TS code stream finally. The demodulator fusion realization architecture not only can realize the fusion of the single carrier and the multicarrier, but also has high resource reusability and low realization complexity.
Description
Technical field
The present invention relates to the transmission of wireless signals field, particularly relate to a kind of national standard digital television ground broadcast demodulator and merge the realization system.
Background technology
Terrestrial DTV national standard (GB20600-2006) is the first national standard of China's field of digital television transmission.
This standard code in UHF (superfrequency) and VHF (very high frequency(VHF)) frequency range, in every 8MHz Digital Television frequency band, the frame structure of digital television ground broadcast transmission system signal, chnnel coding and modulation technique requirement.Support the transmission of standard resolution and high-resolution digital television signal, support fixing the reception and mobile the reception.
This standard has merged the multi-carrier scheme of Tsing-Hua University and the single-carrier scheme of Shanghai Communications University.Because there are bigger difference in single carrier and multicarrier on principle, on implementation, if take the scheme of mixing, its complexity will be very high.Existing all-in-one has all adopted the mode of two chips combinations: multicarrier and single carrier respectively adopt a chips, and its shortcoming is very tangible, for example is not easy to the system integration; Switching between single carrier and the multicarrier is very inconvenient, and the time is also longer; Be unfavorable for very much the development of industrialization.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of national standard digital television ground broadcast demodulator and merges the realization system, and it not only can realize the fusion of single carrier and multicarrier, and resource multiplex rate height, and the complexity of realization is low.
For solving the problems of the technologies described above, the demodulator of national standard digital television ground broadcast of the present invention merges the realization system, comprise analog-to-digital conversion module, receive the analog intermediate frequency or the zero intermediate frequency signals that convert to through radio-frequency tuner, after sampling, convert digital intermediate frequency or zero intermediate frequency signals to;
The intermediate frequency process module is connected with described analog-to-digital conversion module, and the frequency offset tracking signal of receive channel estimation module output, is used for described digital medium-frequency signal or zero intermediate frequency signals are converted to the 7.56MHz baseband signal that meets GB;
PN data separating module is connected with the intermediate frequency process module, and the timing tracking control signal of receive channel estimation module output, carries out separating of PN signal frame head and signal frame data subject, handles use for channel estimation module and follow-up other module data respectively; The AGC of its output (automatic gain control) signal controlling radio-frequency tuner guarantees to arrive the analog intermediate frequency of analog-to-digital conversion module or the amplitude of zero intermediate frequency signals is fit to digital demodulation.
Blind mode detection module is connected with PN data separating module, in the system initialization process, carries out the initial phase coupling and identification of the respective frame of total blindness's pattern under complete unknown situation;
Channel estimation module is connected with blind mode detection module, carries out channel estimation process, generates the channel condition information signal, to eliminate the influence of channel to signal;
The Interference Cancellation module is connected with PN data separating module, and the delivery channel signal status information of receive channel estimation module, carries out interference-cancellation process;
The first general time frequency transformation processing module is connected with the Interference Cancellation module, finishes FFT or IFFT conversion;
The second general time frequency transformation processing module is connected with channel estimation module, finishes FFT or IFFT conversion;
The frequency domain equalization module is connected with first and second general time frequency transformation processing module, and the frequency domain data after the receiving conversion carries out unified equilibrium treatment to single carrier, multicarrier on frequency domain, removes the influence of channel to signal;
First selector switch, be connected frequency domain equalization module and multicarrier conversion process module, threeway with between the time-frequency conversion process module, be used to select be communicated with between frequency domain equalization module and the multicarrier conversion process module, or frequency domain equalization module and threeway are with being communicated with between the time-frequency conversion process module;
Multicarrier conversion process module generates 3780 frequency domain multi-carrier signals that meet multicarrier standard needs;
Threeway is finished FFT or IFFT conversion with time-frequency conversion process module, forms the time domain single-carrier signal that meets the single carrier standard;
Second selector switch, be connected multicarrier conversion process module, threeway with between time-frequency conversion process module and QAM demodulation and the channel decoding module, be used to select be connected between multicarrier conversion process module and quadrature amplitude modulation demodulation and the channel decoding module, or threeway is connected with between time-frequency conversion process module and quadrature amplitude modulation demodulation and the channel decoding module;
QAM demodulation and channel decoding module are carried out the make a start inverse operation process of standard of national standard digital television terrestrial broadcasting, form MPEG TS code stream.
Owing to adopt technique scheme, the receiver demodulator of national standard digital television ground broadcast of the present invention merges the realization system, can realize the fusion of national standard digital television ground broadcast truly.And owing to only adopt a chip, resource multiplex rate height when GB single carrier and multicarrier are merged, the realization of system is simple relatively, has reduced the complexity of realization, is convenient to very much industrialization.Be applicable to national standard digital television terrestrial broadcasting receiving system.
Description of drawings
The present invention is further detailed explanation below in conjunction with accompanying drawing and embodiment:
Accompanying drawing is that GB single carrier of the present invention, multicarrier demodulator merge realization system configuration schematic diagram.
Embodiment
As shown in the figure, merge in the realization system at national standard digital television terrestrial broadcast receiver demodulator of the present invention, its function is mainly finished by the MXD1320 chip.Radio-frequency tuner is used for received RF signal and it is transformed into analog intermediate frequency or zero intermediate frequency signals.The MXD1320 chip is handled analog intermediate frequency or the zero intermediate frequency signals after the radio-frequency tuner conversion.
Described MXD1320 chip comprises:
Analog-to-digital conversion module 101, analog intermediate frequency or zero intermediate frequency signals convert digital intermediate frequency or zero intermediate frequency signals to via analog-to-digital conversion module 101 samplings.
Intermediate frequency process module 102 will be converted to the 7.56MHz baseband signal that meets GB through digital medium-frequency signal or the zero intermediate frequency signals after analog-to-digital conversion module 101 conversions.This module mainly comprises parts such as DDC (Digital Down Conversion Digital Down Convert), filter, interpolation conversion and frequency offset tracking.
The function of DDC mainly is to realize being used with any IF spot by NCO (Numeric Controlled Oscillator digital controlled oscillator), greatly reduces radio-frequency tuner to the IF spot designing requirement.Processing through DDC makes the digital medium-frequency signal that is positioned at the Low Medium Frequency position on the frequency domain, and digital quadrature demodulation is to baseband I, Q signal.
Filter mainly is for the ACS that improves receiver (Adjacent ChannelSelectivity: ability adjacentchannel selectivity).
The interpolation conversion is in order to obtain meeting the 7.56MHz baseband signal of GB.
Frequency offset tracking is in the process of normal operation, tackles the drift of carrier wave and the drift of sampling clock, needs to receive the frequency offset tracking signal and carries out the frequency offset tracking processing.
PN data separating module 103 receives regularly tracking control signal and carries out separating of PN (pseudo random sequence) signal frame head and signal frame data subject, to handle use for channel estimation module 105 and follow-up other module data respectively.The AGC of its output (automatic gain control) signal controlling radio-frequency tuner guarantees to arrive the analog intermediate frequency of analog-to-digital conversion module or the amplitude of zero intermediate frequency signals is fit to digital demodulation.
Blind mode detection module 104.Two kinds of carrier systems of GB regulation: single carrier (C=1) and multicarrier (C=3780); Three kinds of PN frame head forms: 420,595,945.In three kinds of PN frame head forms, first kind (420 form) also has fixing with the third (945 form) and changes two kinds of patterns, and second kind is had only fixed mode.Under changing pattern, also need to carry out the initial phase identification of respective frame.Blind mode detection module 104 carries out the initial phase coupling and identification of the respective frame of total blindness's pattern exactly under complete unknown situation.This module is only used in the system initialization process.Blind mode detection module 104 mates and identification at the initial phase that initialization stops described respective frame later on, only plays the effect of signal transmission.
Channel estimation module 105.Wireless digital TV-set terrestrial broadcasting receiving system is different from wired broadcast system, and its channel has distinctive complexity.This mainly shows in the following areas:
A) under the situation of analog digital coexistence at present, receiver also has with frequency and the adjacent existence of simulaed interference signal frequently except having various noises such as thermal noise, impulsive noise and Johnson noise etc. in the actual application environment.
B) owing to need to support to cover on a large scale, static multipath effect is very obvious, the multipath transmisstion that needs consideration to cause by reflection, diffraction, scattering, can cause frequency selective fading, wireless digital TV-set terrestrial broadcasting receiving system should have the anti-time delay extended capability stronger than general mobile communication system.
C) owing to need to support mobile application such as vehicle-mounted grade, the frequency shift property that causes by Doppler under the dynamic multi-path condition, can cause time selective fading, the wireless digital TV-set terrestrial broadcast system should have the felt power of broad and to the quick follow-up control of time varying channel.
Under so complicated wireless channel environment, to carry out correlation demodulation and must carry out channel estimation process, to eliminate the influence of channel signal.
Interference Cancellation module 106.As previously mentioned; because wireless signal can have bigger time delay extended attribute usually behind wireless channel; will introduce ISI (Inter Symbol Interference intersymbol interference), thereby influence the receptivity of system, therefore must carry out interference-cancellation process.
First, second and third general time frequency transformation processing module 107,108,111.These general time frequency transformation processing modules are the parameter configuration difference, and major function is to finish FFT (Fourier transform) or IFFT (inverse fourier transform) conversion.
Frequency domain equalization module 109 receives through the frequency domain data after first and second general time frequency transformation processing module 107,108 conversion, on frequency domain single carrier, multicarrier is carried out unified equilibrium treatment, removes the influence of channel to signal.
Multicarrier conversion process module 110,3780 frequency domain datas that the generation standard needs.
QAM (quadrature amplitude modulation) demodulation and channel decoding module 112 are carried out the make a start inverse operation process of standard of national standard digital television terrestrial broadcasting, form the MPEG transmission code stream to source decoder.
The present invention realizes that the concrete signal processing flow of single carrier and multicarrier integration program framework is:
Analog intermediate frequency or zero intermediate frequency signals are processed into digital intermediate frequency or zero intermediate frequency signals via analog-to-digital conversion module 101.This digital intermediate frequency or zero intermediate frequency signals are the 7.56MHz baseband signal through the sampling point speed that intermediate frequency process module 102 is processed into GB regulation again.This baseband signal ignorant of the economics mode detection module 104 (this moment, 103 do not work as yet, promptly do not carry out separating of PN signal frame head and signal frame data subject by PN data separating module; Described baseband signal is sent to blind mode detection module 104 by PN data separating module 103, promptly only play the effect of signal transmission) after the respective frame initial phase coupling of carrying out total blindness's pattern and the identification, carry out channel estimation process by channel estimation module 105, form regularly tracking signal control PN data separating module 103, realize that data-signal separates; Channel estimation module 105 also forms the frequency offset tracking signal, and control intermediate frequency process module 102 is carried out frequency offset tracking and handled.(PN data separating module 103 quits work at this moment with process channel estimation module 105 by the data-signal after 103 separation of PN data separating module, promptly stop to carry out separating of PN signal frame head and signal frame data subject, only playing the effect of signal transmission) the channel condition information signal of channel estimation process imports Interference Cancellation module 106 together, carries out interference-cancellation process.Simultaneously, PN data separating module 103 exports also that AGC (automatic gain control) signal controlling radio-frequency tuner guarantees to arrive the analog intermediate frequency of analog-to-digital conversion module or the amplitude of zero intermediate frequency signals is fit to digital demodulation.Then, export the first general time frequency transformation processing module 107 to, carry out FFT or IFFT conversion.The channel condition information signal of process channel estimation module 105 channel estimation process inputs to the second general time frequency transformation processing module 108 simultaneously and carries out FFT or IFFT conversion.The frequency domain equalization processing is carried out in the output of first and second general time frequency transformation processing module 107,108 input frequency domain balance module 109 respectively.Signal behind frequency domain equalization forms the frequency domain multi-carrier signal that meets the multicarrier standard by first selector switch control input multicarrier conversion process module 110, enters QAM demodulation and channel decoding module 112 through second selector switch again; Perhaps the signal behind frequency domain equalization is by first selector switch control input threeway time-frequency conversion process module 111, formation meets the time domain single-carrier signal of single carrier standard, enter QAM demodulation and channel decoding module 112 through described second selector switch again, form MPEG TS stream at last and deliver to information source source code device.
Claims (2)
1. a national standard digital television ground broadcast receiver demodulator merges the realization system, comprising: analog-to-digital conversion module, receive analog intermediate frequency or zero intermediate frequency signals, and after sampling, convert digital intermediate frequency or zero intermediate frequency signals to;
The intermediate frequency process module is connected with described analog-to-digital conversion module, and the frequency offset tracking signal of receive channel estimation module output, is used for described digital medium-frequency signal or zero intermediate frequency signals are converted to the 7.56MHz baseband signal that meets GB;
PN data separating module is connected with the intermediate frequency process module, and the timing tracking control signal of receive channel estimation module output, carries out separating of PN signal frame head and signal frame data subject, handles use for channel estimation module and follow-up other module data respectively; The automatic gaining controling signal control radio-frequency tuner of its output guarantees to arrive the analog intermediate frequency of analog-to-digital conversion module or the amplitude of zero intermediate frequency signals is fit to digital demodulation;
Blind mode detection module is connected with PN data separating module, in the system initialization process, carries out the initial phase coupling and identification of the respective frame of total blindness's pattern under complete unknown situation;
Channel estimation module is connected with blind mode detection module, carries out channel estimation process, to eliminate the influence of channel to signal;
The Interference Cancellation module is connected with PN data separating module, and the delivery channel signal status information of receive channel estimation module, carries out interference-cancellation process;
The first general time frequency transformation processing module is connected with the Interference Cancellation module, finishes FFT or IFFT conversion;
The second general time frequency transformation processing module is connected with channel estimation module, finishes FFT or IFFT conversion;
The frequency domain equalization module is connected with first and second general time frequency transformation processing module, and the frequency domain data after the receiving conversion carries out unified equilibrium treatment to single carrier, multicarrier on frequency domain, removes the influence of channel to signal;
First selector switch, be connected frequency domain equalization module and multicarrier conversion process module, threeway with between the time-frequency conversion process module, be used to select be communicated with between frequency domain equalization module and the multicarrier conversion process module, or frequency domain equalization module and threeway are with being communicated with between the time-frequency conversion process module;
Multicarrier conversion process module generates 3780 frequency domain multi-carrier signals that meet multicarrier standard needs;
Threeway is finished FFT or IFFT conversion with time-frequency conversion process module, forms the time domain single-carrier signal that meets the single carrier standard;
Second selector switch, be connected multicarrier conversion process module, threeway with between time-frequency conversion process module and quadrature amplitude modulation demodulation and the channel decoding module, be used to select be connected between multicarrier conversion process module and quadrature amplitude modulation demodulation and the channel decoding module, or threeway is connected with between time-frequency conversion process module and quadrature amplitude modulation demodulation and the channel decoding module;
Quadrature amplitude modulation demodulation and channel decoding module are carried out the make a start inverse operation process of standard of national standard digital television terrestrial broadcasting, form MPEG TS code stream.
2. national standard digital television ground broadcast receiver demodulator as claimed in claim 1 merges the realization system, and it is characterized in that: described intermediate frequency process module comprises Digital Down Convert, filter, interpolation conversion and frequency offset tracking part;
Digital Down Convert realizes being used with any IF spot by digital controlled oscillator, and the processing through Digital Down Convert makes the digital medium-frequency signal that is positioned at the Low Medium Frequency position on the frequency domain, and digital quadrature demodulation is to baseband I, Q signal;
Filter is used to improve the adjacentchannel selectivity ability of receiver;
The interpolation conversion is used to obtain meeting the 7.56MHz baseband signal of GB;
Frequency offset tracking is used to receive the frequency offset tracking signal and carries out the frequency offset tracking processing.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1798337A (en) * | 2004-12-30 | 2006-07-05 | 电子科技大学 | Framing method of isomorphic data in two domains in use for ground digital TV transmission system |
| CN1984326A (en) * | 2006-04-25 | 2007-06-20 | 华为技术有限公司 | Method, apparatus and system for transmitting wireless digital TV-set and broadcast |
| CN101110901A (en) * | 2007-07-31 | 2008-01-23 | 北京航空航天大学 | Synchronous generation method and device for carrier in ground digital television system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1798337A (en) * | 2004-12-30 | 2006-07-05 | 电子科技大学 | Framing method of isomorphic data in two domains in use for ground digital TV transmission system |
| CN1984326A (en) * | 2006-04-25 | 2007-06-20 | 华为技术有限公司 | Method, apparatus and system for transmitting wireless digital TV-set and broadcast |
| CN101110901A (en) * | 2007-07-31 | 2008-01-23 | 北京航空航天大学 | Synchronous generation method and device for carrier in ground digital television system |
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