Mobile signal transmission method for digital broadcast single frequency network
Mobile signal transmission method for digital broadcast single frequency network
 CN 103,763,083 A
 Filed: 01/13/2014
 Published: 04/30/2014
 Est. Priority Date: 01/13/2014
 Status: Active Application
First Claim
1. a mobile signal transmission method for digital broadcast singlefrequency network, is characterized in that it comprises the following steps:
 1) the centre data manager of single frequency network converts the multimedium data media data processor of flowing through to bit stream, and the scrambler sequence of utilizing feedback shift register to produce is carried out scrambling processing to form input data bit flow;
2) the network data management device of single frequency network is rotated in the flow through code element modulation of input data bit 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 a kind of in QPSK, 16QAM, 64QAM and 256QAM, and the symbol constellations figure mapping mode of code element modulation adopts Gray code mapping;
Code element rotation is by rotating to an angle and realize symbol constellations figure, 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;
3) the network data management device of single frequency network adopts spacefrequency coding device that code check is 1 that the FFT data block forming on frequency domain is modulated to and in each digital broadcast mobile signals transmitter branches in single frequency network, forms empty frequency modulation FFT data block processed, and the time synchronized of adjusting each digital broadcast singlefrequency network movable signal transmitter branches is all processed empty frequency modulation FFT data block processed at one time with all transmitters in assurance network;
4) each digital broadcast mobile signals transmitter in single frequency network adopts IFFT that empty frequency modulation FFT data block processed is transformed to sky frequency modulation time domain discrete data sample block D processed _{total}=[d _{0}, d _{1}..., d _{k2}, d _{k1}];
5) each digital broadcast mobile signals transmitter in single frequency network is by empty frequency modulation time domain discrete data sample block demultiplexing processed and according to the sequencing odd even of each the empty frequency modulation time domain discrete data sample processed successively separated strange subblock D of empty frequency modulation time domain discrete data sample processed that generates _{very}=[d _{0}, d _{2}..., d _{k4}, d _{k2}] and the even subblock D of empty frequency modulation time domain discrete data sample processed _{even}=[d _{1}, d _{3}..., d _{k3}, d _{k1}];
6) each digital broadcast mobile signals transmitter in single frequency network passes through peaktoaverage power ratio adjustment unit to the strange subblock D of empty frequency modulation time domain discrete data sample processed _{very}, the even subblock D of empty frequency modulation time domain discrete data sample processed _{even}carry out signal power adjustment and corresponding signal and process also synthetic new empty frequency modulation time domain discrete data sample block D processed again _{new}, new empty frequency modulation time domain discrete data sample block D processed _{new}adopt 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 compare the synthetic empty frequency modulation time domain discrete data sample block D processed of 18 kinds of generate patterns _{new}, choose wherein there is minimum peaktoaverage power ratio the empty frequency modulation of peaktoaverage power ratio time domain discrete data sample block processed falls and the empty frequency modulation of peaktoaverage power ratio time domain discrete data sample block processed will be fallen the corresponding generate pattern information adopting send to operational indicator sequence setting unit, wherein, D ^{*}_{very}expression is to the strange subblock D of empty frequency modulation time domain discrete data sample processed _{very}each sky frequency modulation time domain discrete data sample processed carry out conjugate operation processing and the empty frequency modulation time domain discrete data sample subblock processed that obtains;
D ^{*}_{even}expression is to the even subblock D of empty frequency modulation time domain discrete data sample processed _{even}each sky frequency modulation time domain discrete data sample processed carry out conjugate operation processing and the empty frequency modulation time domain discrete data sample subblock processed that obtains;
7) each digital broadcast mobile signals transmitter Insert service index series after training sequence in single frequency network forms timedomain 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 each digital broadcast mobile signals transmitter in single frequency network;
8) each digital broadcast mobile signals transmitter in single frequency network inserts and falls the empty frequency modulation of peaktoaverage power ratio time domain discrete data sample block processed using Cyclic Prefix as protection interval, the empty frequency modulation of peaktoaverage power ratio time domain cyclic prefix discrete data sample block processed falls in formation, as frame, the length of Cyclic Prefix is C;
9) each digital broadcast mobile signals transmitter in single frequency network is that frame head is inserted into that to fall the empty frequency modulation of peaktoaverage power ratio time domain cyclic prefix discrete data sample block processed be frame by timedomain training sequence discrete sample block, to form signal frame;
10) each digital broadcast mobile signals transmitter in single frequency network adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
11) each digital broadcast mobile signals transmitter in single frequency network forms emission of radio frequency signals to onair radio channel by baseband signal upconversion to carrier wave;
12) radiofrequency signal that each digital broadcast mobile signals transmitter in the detection of the digital broadcast mobile signals receiver in single frequency network reception single frequency network sends also forms baseband signal by its downconversion, utilizes the architectural characteristic of training sequence characteristic and signal frame to carry out baseband signal reception &
disposal.
Chinese PRB Reexamination
Abstract
The invention discloses a mobile signal transmission method for a digital broadcast single frequency network, and relates to a mixed framing modulation scheme of the space domain, the time domain and the frequency domain. According to the training sequence optimization design, the signal generating scheme and the signal selecting method of the mobile signal transmission method for the digital broadcast single frequency network, OFDM signals can be processed and recovered at a receiver end easily to obtain original signals of the OFDM signals. The mobile signal transmission method for the digital broadcast single frequency network has the advantages of being low in peaktoaverage power ratio, short in synchronization time, resistant to channel fading, multiple in controllable service and the like.

5 Citations
No References
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6 Claims

1. a mobile signal transmission method for digital broadcast singlefrequency network, is characterized in that it comprises the following steps:

1) the centre data manager of single frequency network converts the multimedium data media data processor of flowing through to bit stream, and the scrambler sequence of utilizing feedback shift register to produce is carried out scrambling processing to form input data bit flow; 2) the network data management device of single frequency network is rotated in the flow through code element modulation of input data bit 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 a kind of in QPSK, 16QAM, 64QAM and 256QAM, and the symbol constellations figure mapping mode of code element modulation adopts Gray code mapping;
Code element rotation is by rotating to an angle and realize symbol constellations figure, 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;3) the network data management device of single frequency network adopts spacefrequency coding device that code check is 1 that the FFT data block forming on frequency domain is modulated to and in each digital broadcast mobile signals transmitter branches in single frequency network, forms empty frequency modulation FFT data block processed, and the time synchronized of adjusting each digital broadcast singlefrequency network movable signal transmitter branches is all processed empty frequency modulation FFT data block processed at one time with all transmitters in assurance network; 4) each digital broadcast mobile signals transmitter in single frequency network adopts IFFT that empty frequency modulation FFT data block processed is transformed to sky frequency modulation time domain discrete data sample block D processed _{total}=[d _{0}, d _{1}..., d _{k2}, d _{k1}];
5) each digital broadcast mobile signals transmitter in single frequency network is by empty frequency modulation time domain discrete data sample block demultiplexing processed and according to the sequencing odd even of each the empty frequency modulation time domain discrete data sample processed successively separated strange subblock D of empty frequency modulation time domain discrete data sample processed that generates _{very}=[d _{0}, d _{2}..., d _{k4}, d _{k2}] and the even subblock D of empty frequency modulation time domain discrete data sample processed _{even}=[d _{1}, d _{3}..., d _{k3}, d _{k1}];
6) each digital broadcast mobile signals transmitter in single frequency network passes through peaktoaverage power ratio adjustment unit to the strange subblock D of empty frequency modulation time domain discrete data sample processed _{very}, the even subblock D of empty frequency modulation time domain discrete data sample processed _{even}carry out signal power adjustment and corresponding signal and process also synthetic new empty frequency modulation time domain discrete data sample block D processed again _{new}, new empty frequency modulation time domain discrete data sample block D processed _{new}adopt 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 compare the synthetic empty frequency modulation time domain discrete data sample block D processed of 18 kinds of generate patterns _{new}, choose wherein there is minimum peaktoaverage power ratio the empty frequency modulation of peaktoaverage power ratio time domain discrete data sample block processed falls and the empty frequency modulation of peaktoaverage power ratio time domain discrete data sample block processed will be fallen the corresponding generate pattern information adopting send to operational indicator sequence setting unit, wherein, D ^{*}_{very}expression is to the strange subblock D of empty frequency modulation time domain discrete data sample processed _{very}each sky frequency modulation time domain discrete data sample processed carry out conjugate operation processing and the empty frequency modulation time domain discrete data sample subblock processed that obtains;
D ^{*}_{even}expression is to the even subblock D of empty frequency modulation time domain discrete data sample processed _{even}each sky frequency modulation time domain discrete data sample processed carry out conjugate operation processing and the empty frequency modulation time domain discrete data sample subblock processed that obtains;
7) each digital broadcast mobile signals transmitter Insert service index series after training sequence in single frequency network forms timedomain 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 each digital broadcast mobile signals transmitter in single frequency network; 8) each digital broadcast mobile signals transmitter in single frequency network inserts and falls the empty frequency modulation of peaktoaverage power ratio time domain discrete data sample block processed using Cyclic Prefix as protection interval, the empty frequency modulation of peaktoaverage power ratio time domain cyclic prefix discrete data sample block processed falls in formation, as frame, the length of Cyclic Prefix is C; 9) each digital broadcast mobile signals transmitter in single frequency network is that frame head is inserted into that to fall the empty frequency modulation of peaktoaverage power ratio time domain cyclic prefix discrete data sample block processed be frame by timedomain training sequence discrete sample block, to form signal frame; 10) each digital broadcast mobile signals transmitter in single frequency network adopts square root raised cosine filter to be shaped to the signal pulse of signal frame; 11) each digital broadcast mobile signals transmitter in single frequency network forms emission of radio frequency signals to onair radio channel by baseband signal upconversion to carrier wave; 12) radiofrequency signal that each digital broadcast mobile signals transmitter in the detection of the digital broadcast mobile signals receiver in single frequency network reception single frequency network sends also forms baseband signal by its downconversion, utilizes the architectural characteristic of training sequence characteristic and signal frame to carry out baseband signal reception &
disposal.


2. by the mobile signal transmission method for digital broadcast singlefrequency network of claim 1, it is characterized in that:
 described training sequence is comprised of the first training sequence and the second training sequence;
The first training sequence alternately inserts the new sequence of generation by each symbol of permanent envelope zero autocorrelation CAZAC sequence B and pseudorandom PN sequence A and Cyclic Prefix that length is G forms;
The second training sequence is by permanent envelope zero autocorrelation CAZAC sequenceB ^{*}with pseudorandom PN sequence A ^{*}each symbol alternately insert the Cyclic Prefix that the new sequence that produces and length thereof are G and form;
B ^{*}expression is carried out conjugate operation processing, A to each symbol of B ^{*}expression is carried out conjugate operation processing to each symbol of A, and B has identical symbol lengths L with A.
 described training sequence is comprised of the first training sequence and the second training sequence;

3. by the mobile signal transmission method for digital broadcast singlefrequency network of claim 1, it is characterized in that:
 described C gets 1/16 of K;
Described G gets 1/8 of L.
 described C gets 1/16 of K;

4. by the mobile signal transmission method for digital broadcast singlefrequency network of claim 1, it is characterized in that:
 described operational indicator sequence has pseudorandom characteristics, by one group of Phase shift m sequence, realized.

5. by the mobile signal transmission method for digital broadcast singlefrequency network of claim 1, it is characterized in that:
 described FFT data block is comprised of subcarrier, the frequency interval of subcarrier is got a kind of in 2KHz, 4KHz, 1KHz.

6. by the mobile signal transmission method for digital broadcast singlefrequency network of claim 1, it is characterized in that:
 the baseband signal reception &
disposal that described digital broadcast singlefrequency network movable signal receiver carries out, one of them step is that the time domain and frequency domain combined alternate analysis of signal frame head and signal frame body is processed.
 the baseband signal reception &
Specification(s)