CN103780557A - Movable signal framing modulation method in multimedia broadcasting - Google Patents
Movable signal framing modulation method in multimedia broadcasting Download PDFInfo
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- CN103780557A CN103780557A CN201410024068.3A CN201410024068A CN103780557A CN 103780557 A CN103780557 A CN 103780557A CN 201410024068 A CN201410024068 A CN 201410024068A CN 103780557 A CN103780557 A CN 103780557A
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Abstract
The invention discloses a movable signal framing modulation method in multimedia broadcasting. The movable signal framing modulation method in multimedia broadcasting is a framing modulation scheme of mixed time domains and frequency domains, comprises a training sequence optimized design, a signal generation mode and a signal selection method, obtains original signals of OFDM signals easily at a receiver end through processing and recovery, and has the advantages of being low peak-to-average power ratio, short in synchronization time, resistant to channel fading, controllable in multiple service and the like.
Description
Technical field
The invention belongs to wireless communication field, relate more specifically to a kind of multimedia broadcast mobile signal framing modulation method.
Background technology
At present, television broadcasting is from simulating gradually to digitlization future development.Digital TV multimedia broadcast wireless transmissions system, as the important component part of digital TV multimedia broadcast radio, the development of its correlation technique, closely bound up with people's quality of life, and be therefore subject to people's extensive concern especially.Digital TV multimedia broadcast radio correlation technique and related industry thereof are that in Communications And Computer field, development is very fast, the industry of good market prospect.In digital TV multimedia broadcast radio correlation technique, the emphasis that various countries pay close attention to is at present that the digital TV multimedia broadcast radio how to pass under environment for complex wave provides the implementation of reliable high-speed mobile cheaply.Multimedia broadcasting movable signal transmitter framing modulation technique is the key technology of digital TV multimedia broadcast wireless system, plays conclusive effect for whole system performance, is the object of everybody primary study.
Due to the develop rapidly of Digital Signal Processing and integrated circuit technique, the system of OFDM (OFDM) technology realizes and becomes more and more easier.Because OFDM Multicarrier Transmission Technology has simple in structure, the availability of frequency spectrum is high, the plurality of advantages such as can resist frequency selectivity and channel time, becomes and extremely everybody concern obtain deep research and extensive use in the numerous areas such as Xdsl, wide-band mobile communication, wideband wireless local area network, digital TV multimedia broadcast radio.
The peak-to-average power ratio (PAPR) that ofdm signal is higher has very high requirement to the range of linearity of amplifier and digital to analog converter, if system linearity scope can not meet the variation of signal, can cause signal distortion, signal spectrum is changed, thereby cause the orthogonality between subchannel to be destroyed, produce phase mutual interference, make system performance degradation.Therefore the solution that, must consider how to reduce the probability of occurrence of large peak power signal in ofdm signal and reduce nonlinear distortion impact.
In practical communication environment, digital TV multimedia broadcast radio communication system performance is subject to the impact of the factors such as lock in time, clock jitter, channel fading, channel disturbance.Multimedia broadcasting movable signal transmitter framing modulator approach is to realize the key technology of reliable digit television multimedia broadcast radio.
Utilizing digital TV multimedia broadcast wireless transmissions system to provide free television broadcasting, paid television broadcasting, Secret Information Transmission, multimedia value-added service etc. can control multi-service is the embodiment that new-generation digital television multimedia broadcast wireless transmissions system satisfies social needs.
Based on above background, the present invention is directed to practical communication environment and propose a kind of multimedia broadcast mobile signal framing modulation method just, can meet High Data Rate and can control the needs of multi-service digital TV multimedia broadcast wireless transmissions.
Wish is done more deep understanding to patent background can be with reference to following documents and materials:
R.V.Nee，R.Prasad.“OFDM?for?wireless?multimedia?communications”.Boston：Artech?House，2000.
Y.Wu，S.Hirakawa，U.H.Reimers，and?J.Whitaker.“Overview?of?digital?television?development，”Proceedings?of?the?IEEE，Special?Issue?on?Global?Digital?Television：Technology?and?Emerging?Services，pp.8-21，Jan.2006.M.S.Richer，G.Reitmeier，T.Gurley，G.A.Jones，J.Whitaker，and?R.Rast.“The?ATSC?digital?television?system，”Proceedings?of?the?IEEE，Special?Issue?on?Global?Digital?Television：Technology?and?Emerging?Services，pp.37-43，Jan.2006.
U.Ladebusch?and?C.A.Liss.“Terrestrial?DVB(DVB-T)：A?broadcast?technology?for?stationary?portable?and?mobile?use，”Proceedings?of?the?IEEE，Special?Issue?on?Global?Digital?Television：Technology?and?Emerging?Services，pp.183-194，Jan.2006.
M.Takada?and?M.Saito.“Transmission?systems?for?ISDB-T，”Proceedings?of?the?IEEE，Special?Issue?on?Global?Digital?Television：Technology?and?Emerging?Services，pp.251-256，Jan.2006.
Summary of the invention
The present invention is directed to High Data Rate and can control multi-service digital TV multimedia broadcast radio problem, proposed a kind of multimedia broadcast mobile signal framing modulation method.
A kind of multimedia broadcast mobile signal framing modulation method that the present invention proposes, is characterized in that it comprises the following steps:
1) multimedia broadcasting movable signal transmitter is rotated in flow through code element modulation of the input data bit of oneself on frequency domain and forms FFT data block with code element, and the length of FFT data block is K, and the numerical value of K is got even number; Code element is modulated to the one in QPSK, 16QAM, 64QAM and 256QAM, and the symbol constellations figure mapping mode of code element modulation adopts Gray code mapping; Code element is rotated by symbol constellations figure is rotated to an angle and realized, the symbol constellations figure anglec of rotation of QPSK is 22.5 degree, the symbol constellations figure anglec of rotation of 16QAM is 11.25 degree, the symbol constellations figure anglec of rotation of 64QAM is 5.626 degree, and the symbol constellations figure anglec of rotation of 256QAM is 2.8125 degree;
2) multimedia broadcasting movable signal transmitter adopts IFFT that FFT data block is transformed to time domain discrete data sample block D
total=[d
0, d
1..., d
k-2, d
k-1];
3) multimedia broadcasting movable signal transmitter separates successively and generates the strange sub-block D of time domain discrete data sample by time domain discrete data sample block demultiplexing and according to the sequencing odd even of each time domain discrete data sample
very=[d
0, d
2..., d
k-4, d
k-2] and the even sub-block D of time domain discrete data sample
even=[d
1, d
3..., d
k-3, d
k-1];
4) multimedia broadcasting movable signal transmitter passes through peak-to-average power ratio adjustment unit to the strange sub-block D of time domain discrete data sample
very, the even sub-block D of time domain discrete data sample
evencarry out signal power adjustment and corresponding signal and process also synthetic new time domain discrete data sample block D again
new, new time domain discrete data sample block D
newadopt following generate pattern to obtain, generate pattern 1 is D
new=[D
very, D
even], generate pattern 2 is
generate pattern 3 is
generate pattern 4 is
generate pattern 5 is
generate pattern 6 is
generate pattern 7 is D
new=[D
* very, D
even], generate pattern 8 is
generate pattern 9 is
generate pattern 10 is
generate pattern 11 is
generate pattern 12 is
generate pattern 13 is D
new=[D
very, D
* even], generate pattern 14 is
generate pattern 15 is
generate pattern 16 is
generate pattern 17 is
generate pattern 18 is
relatively 18 kinds of time domain discrete data sample block D that generate pattern is synthetic
new, choose wherein there is minimum peak-to-average power ratio peak-to-average power ratio time domain discrete data sample block falls
and peak-to-average power ratio time domain discrete data sample block will be fallen
the corresponding generate pattern information adopting send to operational indicator sequence setting unit, wherein, D
*very represent the strange sub-block D of time domain discrete data sample
veryeach time domain discrete data sample carry out conjugate operation processing and the time domain discrete data sample sub-block that obtains; D
*even expression the even sub-block D of time domain discrete data sample
eveneach time domain discrete data sample carry out conjugate operation processing and the time domain discrete data sample sub-block that obtains;
5) multimedia broadcasting movable signal transmitter Insert service index series after training sequence forms time-domain training sequence discrete sample block in time domain, and operational indicator sequence is comprising and unique each system parameters and business model information of expressing multimedia broadcasting movable signal transmitter;
6) multimedia broadcasting movable signal transmitter inserts Cyclic Prefix to fall peak-to-average power ratio time domain discrete data sample block as protection interval, forms and falls peak-to-average power ratio time domain cyclic prefix discrete data sample block, and as frame, the length of Cyclic Prefix is C;
7) multimedia broadcasting movable signal transmitter is that frame head is inserted into that to fall peak-to-average power ratio time domain cyclic prefix discrete data sample block be frame by time-domain training sequence discrete sample block, to form signal frame;
8) multimedia broadcasting movable signal transmitter adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
9) multimedia broadcasting movable signal transmitter by baseband signal up-conversion to carrier wave.
According to above-mentioned multimedia broadcast mobile signal framing modulation method, it is characterized in that: multimedia broadcasting movable signal transmitter peak-to-average power ratio time domain discrete data sample block is fallen by time domain discrete data sample block demultiplexing and separate successively the strange sub-block of time domain discrete data sample of generation and the even sub-block of time domain discrete data sample according to the sequencing odd even of each time domain discrete data sample and carry out signal power adjustment and corresponding signal and process and pass through 18 kinds of generate patterns of particular design and again synthesize; The training sequence of multimedia broadcasting movable signal transmitter is made up of the first training sequence and the second training sequence; The Cyclic Prefix that the first training sequence is G by each symbol new sequence that alternately insertion produces and the length thereof of permanent envelope zero auto-correlation CAZAC sequence B and pseudorandom PN sequence A forms; The second training sequence is by permanent envelope zero auto-correlation CAZAC sequence-B
*with pseudorandom PN sequence A
*each symbol alternately insert the Cyclic Prefix composition that the new sequence that produces and length thereof are G; B
*represent each symbol of B to carry out conjugate operation processing, A
*represent each symbol of A to carry out conjugate operation processing, B has identical symbol lengths L with A; The circulating prefix-length G of the first training sequence and the second training sequence be the first training sequence and the second training sequence symbol lengths L 1/8; The circulating prefix-length C of multimedia broadcasting movable signal transmitter signal frame is 1/16 of FFT data block length K; The operational indicator sequence of multimedia broadcasting movable signal transmitter has pseudo-random characteristics, is realized by one group of Phase shift m sequence; Each different operational indicator sequence of multimedia broadcasting movable signal transmitter is comprising and unique each system parameters and business model information of expressing multimedia broadcasting movable signal transmitter; The FFT data block of multimedia broadcasting movable signal transmitter is made up of subcarrier, and the frequency interval of subcarrier is got the one in 2KHz, 4KHz, 1KHz; Code element is modulated to the one in QPSK, 16QAM, 64QAM and 256QAM, and the symbol constellations figure mapping mode of code element modulation adopts Gray code mapping; Code element is rotated by symbol constellations figure is rotated to an angle and realized, the symbol constellations figure anglec of rotation of QPSK is 22.5 degree, the symbol constellations figure anglec of rotation of 16QAM is 11.25 degree, the symbol constellations figure anglec of rotation of 64QAM is 5.626 degree, and the symbol constellations figure anglec of rotation of 256QAM is 2.8125 degree.
Feature of the present invention:
The present invention is the framing modulation scheme that a kind of time-domain and frequency-domain mixes.Time domain discrete data sample block demultiplexing of the present invention also separates successively and generates the strange sub-block of time domain discrete data sample and the even sub-block of time domain discrete data sample and the corresponding signal power adjustment of carrying out and signal processing according to the sequencing odd even of each time domain discrete data sample, what by particular design 18 kinds fell the generate pattern of peak-to-average power ratio time domain discrete data sample block and had a minimum peak-to-average power ratio falls peak-to-average power ratio time domain discrete data sample block choosing method, but the very high large peak power signal probability of the maximum peak power that not only can make full use of ofdm signal is very low, the power regularity of distribution that the characteristic that the real part (or imaginary part) of the ofdm signal in the time that number of sub carrier wave is larger is multiple Gaussian random process and whose amplitude obeys Rayleigh distribution and then low complex degree ground effectively change over frame signal reaches the object that reduces peak-to-average power ratio, the amount of information of the required extra transmission of generate pattern adopting is little, be easy to process at receiver end the primary signal of recovering to obtain ofdm signal, the orthogonal property that can not destroy sub-carrier signal simultaneously can not produce extra nonlinear distortion yet.Training sequence in the signal frame of multimedia broadcasting movable signal transmitter is obtained through certain optimisation design by permanent envelope zero auto-correlation CAZAC sequence and pseudorandom PN sequence, the signal frame of multimedia broadcasting movable signal transmitter is that frame head is inserted into that to fall peak-to-average power ratio time domain cyclic prefix discrete data sample block be frame and forming by time-domain training sequence discrete sample block, these have guaranteed that multimedia broadcasting movable signal receiver can realize frame synchronization fast and accurately, Frequency Synchronization, time synchronized, channel transfer characteristic is estimated, and phase noise and channel transfer characteristic are reliably followed the tracks of.Cyclic Prefix is inserted and falls peak-to-average power ratio time domain discrete data sample block to form signal frame body as protection interval, can reduce the interference effect between signal frame head and frame data.Code element modulation rotates with code element the diversity that mobile multimedia broadcast signal is provided.Each different operational indicator sequence of multimedia broadcasting movable signal transmitter is comprising and unique each system parameters and business model information of expressing multimedia broadcasting movable signal transmitter, can make digital TV multimedia broadcast wireless transmissions system can provide free television broadcasting, paid television broadcasting, Secret Information Transmission, multimedia value-added service etc. can control multi-service, satisfy social needs.Framing modulator approach of the present invention has low peak-to-average power ratio, lock in time is short, clock jitter is little, anti-channel fading, anti-channel disturbance, can provide High Data Rate can control the plurality of advantages such as multi-service digital TV multimedia broadcast wireless transmissions.
Accompanying drawing explanation
Fig. 1 is the embodiment schematic diagram according to certain transmitter of multimedia broadcast mobile signal framing modulation method of the present invention.
Fig. 2 is according to the embodiment schematic diagram of certain transmitter signal framing modulation of multimedia broadcast mobile signal framing modulation method of the present invention.
Embodiment
Below in conjunction with accompanying drawing, specific embodiments of the invention are described in detail.
The embodiment of certain transmitter of the multimedia broadcast mobile signal framing modulation method proposing according to the present invention, as shown in Figure 1, follows these steps to carry out:
1) this certain multimedia broadcasting movable signal transmitter is rotated in flow through code element modulation of the input data bit of oneself on frequency domain and forms FFT data block with code element, and the length of FFT data block is K, and the numerical value of K is got even number; Code element is modulated to the one in QPSK, 16QAM, 64QAM and 256QAM, and the symbol constellations figure mapping mode of code element modulation adopts Gray code mapping; Code element is rotated by symbol constellations figure is rotated to an angle and realized, the symbol constellations figure anglec of rotation of QPSK is 22.5 degree, the symbol constellations figure anglec of rotation of 16QAM is 11.25 degree, the symbol constellations figure anglec of rotation of 64QAM is 5.626 degree, and the symbol constellations figure anglec of rotation of 256QAM is 2.8125 degree;
2) this certain multimedia broadcasting movable signal transmitter adopts IFFT that FFT data block is transformed to time domain discrete data sample block D
total=[d
0, d
1..., d
k-2, d
k-1];
3) this certain multimedia broadcasting movable signal transmitter separates successively and generates the strange sub-block D of time domain discrete data sample by time domain discrete data sample block demultiplexing and according to the sequencing odd even of each time domain discrete data sample
very=[d
0, d
2..., d
k-4, d
k-2] and the even sub-block D of time domain discrete data sample
even=[d
1, d
3..., d
k-3, d
k-1];
4) this certain multimedia broadcasting movable signal transmitter passes through peak-to-average power ratio adjustment unit to the strange sub-block D of time domain discrete data sample
very, the even sub-block D of time domain discrete data sample
evencarry out signal power adjustment and corresponding signal and process also synthetic new time domain discrete data sample block D again
new, new time domain discrete data sample block D
newadopt following generate pattern to obtain, generate pattern 1 is D
new=[D
very, D
even], generate pattern 2 is
generate pattern 3 is
generate pattern 4 is
generate pattern 5 is
generate pattern 6 is
generate pattern 7 is D
new=[D
* very, D
even], generate pattern 8 is
generate pattern 9 is
generate pattern 10 is
generate pattern 11 is
generate pattern 12 is
generate pattern 13 is D
new=[D
very, D
* even], generate pattern 14 is
generate pattern 15 is
generate pattern 16 is
generate pattern 17 is
generate pattern 18 is
relatively 18 kinds of time domain discrete data sample block D that generate pattern is synthetic
new, choose wherein there is minimum peak-to-average power ratio peak-to-average power ratio time domain discrete data sample block falls
and peak-to-average power ratio time domain discrete data sample block will be fallen
the corresponding generate pattern information adopting send to operational indicator sequence setting unit, wherein, D
* veryrepresent the strange sub-block D of time domain discrete data sample
veryeach time domain discrete data sample carry out conjugate operation processing and the time domain discrete data sample sub-block that obtains; D
* evenrepresent the even sub-block D of time domain discrete data sample
eveneach time domain discrete data sample carry out conjugate operation processing and the time domain discrete data sample sub-block that obtains;
5) this certain multimedia broadcasting movable signal transmitter Insert service index series after training sequence forms time-domain training sequence discrete sample block in time domain, and operational indicator sequence is comprising and unique each system parameters and business model information of expressing multimedia broadcasting movable signal transmitter;
6) this certain multimedia broadcasting movable signal transmitter inserts Cyclic Prefix to fall peak-to-average power ratio time domain discrete data sample block as protection interval, peak-to-average power ratio time domain cyclic prefix discrete data sample block falls in formation, as frame, the length of Cyclic Prefix is C;
7) this certain multimedia broadcasting movable signal transmitter is that frame head is inserted into that to fall peak-to-average power ratio time domain cyclic prefix discrete data sample block be frame by time-domain training sequence discrete sample block, to form signal frame;
8) this certain multimedia broadcasting movable signal transmitter adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
9) this certain multimedia broadcasting movable signal transmitter by baseband signal up-conversion to carrier wave.
According to the embodiment of certain transmitter signal framing modulation of multimedia broadcast mobile signal framing modulation method of the present invention, as shown in Figure 2, be specifically implemented as follows:
This certain multimedia broadcasting movable signal transmitter is rotated in flow through code element modulation and code element of the input data bit of oneself on frequency domain, to form FFT data block, be transformed to again the discrete data sample block of time domain through IFFT, generate and choose the peak-to-average power ratio time domain discrete data sample block of falling wherein with minimum peak-to-average power ratio and the generate pattern information of corresponding institute employing is sent to operational indicator sequence setting unit simultaneously by peak-to-average power ratio adjustment unit.
The FFT data block of this certain multimedia broadcasting movable signal transmitter is made up of subcarrier, and the frequency interval of subcarrier is got the one in 2KHz, 4KHz, 1KHz; Code element is modulated to the one in QPSK, 16QAM, 64QAM and 256QAM, and the symbol constellations figure mapping mode of code element modulation adopts Gray code mapping; Code element is rotated by symbol constellations figure is rotated to an angle and realized, the symbol constellations figure anglec of rotation of QPSK is 22.5 degree, the symbol constellations figure anglec of rotation of 16QAM is 11.25 degree, the symbol constellations figure anglec of rotation of 64QAM is 5.626 degree, and the symbol constellations figure anglec of rotation of 256QAM is 2.8125 degree.
The training sequence of this certain multimedia broadcasting movable signal transmitter is made up of the first training sequence and the second training sequence; The Cyclic Prefix that the first training sequence is G by each symbol new sequence that alternately insertion produces and the length thereof of permanent envelope zero auto-correlation CAZAC sequence B and pseudorandom PN sequence A forms; The second training sequence is by permanent envelope zero auto-correlation CAZAC sequence-B
*with pseudorandom PN sequence A
*each symbol alternately insert the Cyclic Prefix composition that the new sequence that produces and length thereof are G; B
*represent each symbol of B to carry out conjugate operation processing, A
*represent each symbol of A to carry out conjugate operation processing, B has identical symbol lengths L with A; The circulating prefix-length G of the first training sequence and the second training sequence be the first training sequence and the second training sequence symbol lengths L 1/8.
This certain multimedia broadcasting movable signal transmitter Insert service index series after training sequence forms time-domain training sequence discrete sample block in time domain.
The operational indicator sequence of this certain multimedia broadcasting movable signal transmitter has pseudo-random characteristics, is realized by one group of Phase shift m sequence; Each different operational indicator sequence of this certain multimedia broadcasting movable signal transmitter is comprising and unique each system parameters and business model information of expressing multimedia broadcasting movable signal transmitter.
This certain multimedia broadcasting movable signal transmitter inserts Cyclic Prefix to fall peak-to-average power ratio time domain discrete data sample block as protection interval, forms and falls peak-to-average power ratio time domain cyclic prefix discrete data sample block, and as frame, the length of Cyclic Prefix is C; This certain multimedia broadcasting movable signal transmitter is that frame head is inserted into that to fall peak-to-average power ratio time domain cyclic prefix discrete data sample block be frame by time-domain training sequence discrete sample block, to form signal frame; The circulating prefix-length C of this certain multimedia broadcasting movable signal transmitter signal frame is 1/16 of FFT data block length K.
This certain multimedia broadcasting movable signal transmitter adopts square root raised cosine filter to carry out pulse shaping to the signal of signal frame.
By reference to the accompanying drawings specific embodiments of the invention are had been described in detail above, but the present invention is not limited to above-described embodiment, in the spirit and scope situation of claim that does not depart from the application, those skilled in the art can make various modifications or remodeling.
Claims (6)
1. a multimedia broadcast mobile signal framing modulation method, is characterized in that it comprises the following steps:
1) multimedia broadcasting movable signal transmitter is rotated in flow through code element modulation of the input data bit of oneself on frequency domain and forms FFT data block with code element, and the length of FFT data block is K, and the numerical value of K is got even number; Code element is modulated to the one in QPSK, 16QAM, 64QAM and 256QAM, and the symbol constellations figure mapping mode of code element modulation adopts Gray code mapping; Code element is rotated by symbol constellations figure is rotated to an angle and realized, the symbol constellations figure anglec of rotation of QPSK is 22.5 degree, the symbol constellations figure anglec of rotation of 16QAM is 11.25 degree, the symbol constellations figure anglec of rotation of 64QAM is 5.626 degree, and the symbol constellations figure anglec of rotation of 256QAM is 2.8125 degree;
2) multimedia broadcasting movable signal transmitter adopts IFFT that FFT data block is transformed to time domain discrete data sample block D
total=[d
0, d
1..., d
k-2, d
k-1];
3) multimedia broadcasting movable signal transmitter separates successively and generates the strange sub-block D of time domain discrete data sample by time domain discrete data sample block demultiplexing and according to the sequencing odd even of each time domain discrete data sample
very=[d
0, d
2..., d
k-4, d
k-2] and the even sub-block D of time domain discrete data sample
even=[d
1, d
3..., d
k-3, d
k-1];
4) multimedia broadcasting movable signal transmitter passes through peak-to-average power ratio adjustment unit to the strange sub-block D of time domain discrete data sample
very, the even sub-block D of time domain discrete data sample
evencarry out signal power adjustment and corresponding signal and process also synthetic new time domain discrete data sample block D again
new, new time domain discrete data sample block D
newadopt following generate pattern to obtain, generate pattern 1 is D
new=[D
very, D
even], generate pattern 2 is
generate pattern 3 is
generate pattern 4 is
generate pattern 5 is
generate pattern 6 is
generate pattern 7 is D
new=[D
* very, D
even], generate pattern 8 is
generate pattern 9 is
generate pattern 10 is
generate pattern 11 is
generate pattern 12 is
generate pattern 13 is D
new=[D
very, D
* even], generate pattern 14 is
generate pattern 15 is
generate pattern 16 is
generate pattern 17 is
generate pattern 18 is
relatively 18 kinds of time domain discrete data sample block D that generate pattern is synthetic
new, choose wherein there is minimum peak-to-average power ratio peak-to-average power ratio time domain discrete data sample block falls
and peak-to-average power ratio time domain discrete data sample block will be fallen
the corresponding generate pattern information adopting send to operational indicator sequence setting unit, wherein, D
* veryrepresent the strange sub-block D of time domain discrete data sample
veryeach time domain discrete data sample carry out conjugate operation processing and the time domain discrete data sample sub-block that obtains; D
* evenrepresent the even sub-block D of time domain discrete data sample
eveneach time domain discrete data sample carry out conjugate operation processing and the time domain discrete data sample sub-block that obtains;
5) multimedia broadcasting movable signal transmitter Insert service index series after training sequence forms time-domain training sequence discrete sample block in time domain, and operational indicator sequence is comprising and unique each system parameters and business model information of expressing multimedia broadcasting movable signal transmitter;
6) multimedia broadcasting movable signal transmitter inserts Cyclic Prefix to fall peak-to-average power ratio time domain discrete data sample block as protection interval, forms and falls peak-to-average power ratio time domain cyclic prefix discrete data sample block, and as frame, the length of Cyclic Prefix is C;
7) multimedia broadcasting movable signal transmitter is that frame head is inserted into that to fall peak-to-average power ratio time domain cyclic prefix discrete data sample block be frame by time-domain training sequence discrete sample block, to form signal frame;
8) multimedia broadcasting movable signal transmitter adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
9) multimedia broadcasting movable signal transmitter by baseband signal up-conversion to carrier wave.
2. by the multimedia broadcast mobile signal framing modulation method of claim 1, it is characterized in that: described training sequence is made up of the first training sequence and the second training sequence; The Cyclic Prefix that the first training sequence is G by each symbol new sequence that alternately insertion produces and the length thereof of permanent envelope zero auto-correlation CAZAC sequence B and pseudorandom PN sequence A forms; The second training sequence is by permanent envelope zero auto-correlation CAZAC sequence-B
*with pseudorandom PN sequence A
*each symbol alternately insert the Cyclic Prefix composition that the new sequence that produces and length thereof are G; B
*represent each symbol of B to carry out conjugate operation processing, A
*represent each symbol of A to carry out conjugate operation processing, B has identical symbol lengths L with A.
3. by the multimedia broadcast mobile signal framing modulation method of claim 1, it is characterized in that: described C gets 1/16 of K.
4. by the multimedia broadcast mobile signal framing modulation method of claim 1, it is characterized in that: described operational indicator sequence has pseudo-random characteristics, realized by one group of Phase shift m sequence.
5. by the multimedia broadcast mobile signal framing modulation method of claim 1, it is characterized in that: described FFT data block is made up of subcarrier, and the frequency interval of subcarrier is got the one in 2KHz, 4KHz, 1KHz.
6. by the multimedia broadcast mobile signal framing modulation method of claim 1, it is characterized in that: described G gets 1/8 of L.
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Application publication date: 20140507 |