CN103795672A - Single-frequency-network wireless digital broadcast signal transmitting method - Google Patents
Single-frequency-network wireless digital broadcast signal transmitting method Download PDFInfo
- Publication number
- CN103795672A CN103795672A CN201410023947.4A CN201410023947A CN103795672A CN 103795672 A CN103795672 A CN 103795672A CN 201410023947 A CN201410023947 A CN 201410023947A CN 103795672 A CN103795672 A CN 103795672A
- Authority
- CN
- China
- Prior art keywords
- time domain
- processed
- wireless digital
- frequency modulation
- data sample
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Abstract
The invention discloses a single-frequency-network wireless digital broadcast signal transmitting method which is a framing and modulating scheme where the space domain, the time domain and the frequency domain are mixed. Original signals of OFDM signals can be easily obtained by conducting processing and recovering at the receiver end through the training sequence optimizing design, the signal generation mode and the signal selection method of the single-frequency-network wireless digital broadcast signal transmitting method. The single-frequency-network wireless digital broadcast signal transmitting method has the advantages of being low in peak-to-average power ratio, short in synchronization time, capable of resisting channel fading, capable of controlling multiple services, and the like.
Description
Technical field
The invention belongs to wireless communication field, relate more specifically to a kind of Wireless digital broadcast signal transmission method for single frequency network.
Background technology
At present, television broadcasting is from simulating gradually to digitlization future development.Digital Television wireless digital broadcasting transmission system, as the important component part of Digital Television wireless digital broadcasting, 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 Television wireless digital broadcasting 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 Television wireless digital broadcasting correlation technique, the emphasis that various countries pay close attention to is at present that the Digital Television wireless digital broadcasting how to pass under environment for complex wave provides the implementation of reliable high-speed mobile cheaply.Single frequency network wireless digital broadcast signal transmitter framing modulation technique is the key technology of Digital Television wireless digital broadcasting 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 Television wireless digital broadcasting.
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.
Adopt the networking model of single frequency network can greatly improve the availability of frequency spectrum of Digital Television wireless digital broadcasting transmission system.In practical communication environment, Digital Television wireless digital broadcasting communication system performance is subject to the impact of the factors such as lock in time, clock jitter, channel fading, channel disturbance.Single frequency network wireless digital broadcast signal transmitter transmission method is the key technology that realizes the digital broadcasting of reliable digit tv wireless.
Utilizing Digital Television wireless digital broadcasting transmission 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 tv wireless digital broadcasting transmission system satisfies social needs.
Based on above background, the present invention is directed to practical communication environment and propose a kind of Wireless digital broadcast signal transmission method for single frequency network just, can meet High Data Rate and can control the needs that multi-service Digital Television wireless digital broadcasting transmits.
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?mul?timedia?eommunications”.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?Digi?tal?Tele?vision：Technology?and?Emerging?Services，pp.37-43，Jan.2006.
U.Ladebusch?and?C.A.Liss.“Terrestrial?DVB(DVB-T)：A?broadcast?technology?for?stat?ionary?portable?and?mobi?le?use，”Proceedings?ofthe?IEEE，Special?Issue?on?Global?Digi?tal?Tele?vision：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?DigitaI?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 Television wireless digital broadcasting problem, proposed a kind of Wireless digital broadcast signal transmission method for single frequency network.
A kind of Wireless digital broadcast signal transmission method for single frequency network that the present invention proposes, is characterized in that it comprises the following steps:
1) the centre data manager of single frequency network converts the multi-medium 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 will be inputted data bit flow and on frequency domain, form FFT data block, and the length of FFT data block is K, and the numerical value of K is got even number;
3) to adopt code check be 1 to the network data management device of single frequency network that space-frequency coding device is modulated to the FFT data block forming on frequency domain on each wireless digital broadcasting signal transmitter branch road in single frequency network and forms empty frequency modulation FFT data block processed, and the time synchronized of adjusting each wireless digital broadcasting signal transmitter branch road is all processed empty frequency modulation FFT data block processed at one time with all transmitters in assurance network;
4) each wireless digital broadcasting signal transmitter in single frequency network adopts IFFT that FFT data block processed empty frequency modulation is transformed to sky frequency modulation time domain discrete data sample block D processed
total=[d
0, d
1..., d
k-2, d
k-1];
5) each wireless digital broadcasting signal transmitter in single frequency network separates successively and generates the strange sub-block D of empty frequency modulation time domain discrete data sample processed by time domain discrete data sample block demultiplexing processed empty frequency modulation and according to the sequencing odd even of each empty frequency modulation time domain discrete data sample processed
very=[d
0, d
2..., d
k-4, d
k-2] and the even sub-block D of empty frequency modulation time domain discrete data sample processed
even=[d
1, d
3..., d
k-3, d
k-1];
6) each wireless digital broadcasting signal transmitter in single frequency network passes through peak-to-average power ratio adjustment unit to the strange sub-block D of empty frequency modulation time domain discrete data sample processed
very, the even sub-block D of empty frequency modulation time domain discrete data sample processed
evencarry 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
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 empty frequency modulation time domain discrete data sample block D processed that generate pattern is synthetic
new, choose wherein there is minimum peak-to-average power ratio the empty frequency modulation of peak-to-average power ratio time domain discrete data sample block processed falls
and the empty frequency modulation of peak-to-average 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
* veryrepresent the strange sub-block D of empty frequency modulation time domain discrete data sample processed
veryeach empty frequency modulation time domain discrete data sample processed carry out conjugate operation processing and the empty frequency modulation time domain discrete data sample sub-block processed that obtains; D
* evenrepresent the even sub-block D of empty frequency modulation time domain discrete data sample processed
eveneach empty frequency modulation time domain discrete data sample processed carry out conjugate operation processing and the empty frequency modulation time domain discrete data sample sub-block processed that obtains;
7) each wireless digital broadcasting signal transmitter Insert service index series after training sequence in single frequency network forms time domain embedding 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 single frequency network wireless digital broadcast signal transmitter; Time domain embeds the length and the length numerically equal of falling the empty frequency modulation of peak-to-average power ratio time domain discrete data sample block processed of training sequence discrete sample block;
8) each wireless digital broadcasting signal transmitter in single frequency network will fall the empty frequency modulation of peak-to-average power ratio time domain discrete data sample block processed, time domain and embed training sequence discrete sample block and directly superpose and form time domain and embed training sequence and fall peak-to-average power ratio sky frequency modulation time domain discrete data sample block processed, as frame;
9) each wireless digital broadcasting signal transmitter in single frequency network is that frame head inserts time domain and embeds training sequence to fall the empty frequency modulation of peak-to-average power ratio time domain discrete data sample block processed be frame using Cyclic Prefix as protection interval, to form signal frame, the length of Cyclic Prefix is C;
10) each wireless digital broadcasting signal transmitter in single frequency network adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
11) each wireless digital broadcasting signal transmitter in single frequency network forms emission of radio frequency signals to on-air radio channel by baseband signal up-conversion to carrier wave;
12) radiofrequency signal that each wireless digital broadcasting signal transmitter in the detection of the wireless digital broadcasting signal receiver in single frequency network reception single frequency network sends also forms baseband signal by its down-conversion, utilizes the architectural characteristic of training sequence characteristic and signal frame to carry out baseband signal reception & disposal.
According to each method for transmitting radio digital broadcasting signal in above-mentioned single frequency network, it is characterized in that: each wireless digital broadcasting signal transmitter in single frequency network the empty frequency modulation of peak-to-average power ratio time domain discrete data sample block processed is fallen by empty frequency modulation time domain discrete data sample block demultiplexing processed and separate successively the strange sub-block of empty frequency modulation time domain discrete data sample processed of generation and empty frequency modulation time domain discrete data sample idol processed sub-block according to the sequencing odd even of each empty frequency modulation time domain discrete data sample processed 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 each wireless digital broadcasting signal transmitter in single frequency network 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 each wireless digital broadcasting signal transmitter signal frame in single frequency network is 1/16 of FFT data block length K; The operational indicator sequence of each wireless digital broadcasting signal transmitter in single frequency network has pseudo-random characteristics, is realized by one group of Phase shift m sequence; Each different operational indicator sequence of each wireless digital broadcasting signal transmitter in single frequency network is comprising and unique each system parameters and business model information of expressing single frequency network wireless digital broadcast signal transmitter; The FFT data block of each wireless digital broadcasting signal transmitter in single frequency network is made up of subcarrier, and the frequency interval of subcarrier is got the one in 2KHz, 4KHz, 1KHz; The code check of space-frequency coding device is 1.
Feature of the present invention:
The present invention is the framing modulation scheme that a kind of spatial domain time-domain and frequency-domain mixes.Empty frequency modulation of the present invention time domain discrete data sample block demultiplexing processed also separates successively and generates the strange sub-block of empty frequency modulation time domain discrete data sample processed and the even sub-block of empty frequency modulation time domain discrete data sample processed and the corresponding signal power adjustment of carrying out and signal processing according to the sequencing odd even of each empty frequency modulation time domain discrete data sample processed, what by particular design 18 kinds fell the generate pattern of the empty frequency modulation of peak-to-average power ratio time domain discrete data sample block processed and had a minimum peak-to-average power ratio falls peak-to-average power ratio sky frequency modulation time domain discrete data sample block choosing method processed, 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 each wireless digital broadcasting signal transmitter in single frequency network is obtained through certain optimisation design by permanent envelope zero auto-correlation CAZAC sequence and pseudorandom PN sequence, it is by falling the empty frequency modulation of peak-to-average power ratio time domain discrete data sample block processed that the empty frequency modulation of peak-to-average power ratio time domain discrete data sample block processed falls in the time domain embedding training sequence of each wireless digital broadcasting signal transmitter in single frequency network, time domain embeds training sequence discrete sample block and directly superposes and form, these have guaranteed that single frequency network wireless digital broadcasting 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.Insert time domain embedding training sequence using Cyclic Prefix as protection interval and fall the empty frequency modulation of peak-to-average power ratio time domain discrete data sample block processed to form signal frame, can reduce the interference effect between adjacent signals frame.Each different operational indicator sequence of each wireless digital broadcasting signal transmitter in single frequency network is comprising and unique each system parameters and business model information of expressing single frequency network wireless digital broadcast signal transmitter, can make Digital Television wireless digital broadcasting transmission system can provide free television broadcasting, paid television broadcasting, Secret Information Transmission, multimedia value-added service etc. can control multi-service, satisfy social needs.Transmission method 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 Television wireless digital broadcasting transmission.
Accompanying drawing explanation
Fig. 1 is according to the embodiment schematic diagram of the single frequency network transmitter of Wireless digital broadcast signal transmission method for single frequency network of the present invention.
Fig. 2 is according to the embodiment schematic diagram of the single frequency network transmitter signal framing modulation of Wireless digital broadcast signal transmission method for single frequency network of the present invention.
Embodiment
Below in conjunction with accompanying drawing, specific embodiments of the invention are described in detail.
The embodiment of the single frequency network transmitter of the Wireless digital broadcast signal transmission method for single frequency network proposing according to the present invention, as shown in Figure 1, follows these steps to carry out:
1) the centre data manager of single frequency network converts the multi-medium 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 will be inputted data bit flow and on frequency domain, form FFT data block, and the length of FFT data block is K, and the numerical value of K is got even number;
3) to adopt code check be 1 to the network data management device of single frequency network that space-frequency coding device is modulated to the FFT data block forming on frequency domain on each wireless digital broadcasting signal transmitter branch road in single frequency network and forms empty frequency modulation FFT data block processed, and the time synchronized of adjusting each wireless digital broadcasting signal transmitter branch road is all processed empty frequency modulation FFT data block processed at one time with all transmitters in assurance network;
4) each wireless digital broadcasting signal transmitter in single frequency network adopts IFFT that FFT data block processed empty frequency modulation is transformed to sky frequency modulation time domain discrete data sample block D processed
total=[d
0, d
1..., d
k-2, d
k-1];
5) each wireless digital broadcasting signal transmitter in single frequency network separates successively and generates the strange sub-block D of empty frequency modulation time domain discrete data sample processed by time domain discrete data sample block demultiplexing processed empty frequency modulation and according to the sequencing odd even of each empty frequency modulation time domain discrete data sample processed
very=[d
0, d
2..., d
k-4, d
k-2] and the even sub-block D of empty frequency modulation time domain discrete data sample processed
even=[d
1, d
3..., d
k-3, d
k-1];
6) each wireless digital broadcasting signal transmitter in single frequency network passes through peak-to-average power ratio adjustment unit to the strange sub-block D of empty frequency modulation time domain discrete data sample processed
very, the even sub-block D of empty frequency modulation time domain discrete data sample processed
evencarry 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
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 empty frequency modulation time domain discrete data sample block D processed that generate pattern is synthetic
new, choose wherein there is minimum peak-to-average power ratio the empty frequency modulation of peak-to-average power ratio time domain discrete data sample block processed falls
and the empty frequency modulation of peak-to-average 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
* veryrepresent the strange sub-block D of empty frequency modulation time domain discrete data sample processed
veryeach empty frequency modulation time domain discrete data sample processed carry out conjugate operation processing and the empty frequency modulation time domain discrete data sample sub-block processed that obtains; D
* evenrepresent the even sub-block D of empty frequency modulation time domain discrete data sample processed
eveneach empty frequency modulation time domain discrete data sample processed carry out conjugate operation processing and the empty frequency modulation time domain discrete data sample sub-block processed that obtains;
7) each wireless digital broadcasting signal transmitter Insert service index series after training sequence in single frequency network forms time domain embedding 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 single frequency network wireless digital broadcast signal transmitter; Time domain embeds the length and the length numerically equal of falling the empty frequency modulation of peak-to-average power ratio time domain discrete data sample block processed of training sequence discrete sample block;
8) each wireless digital broadcasting signal transmitter in single frequency network will fall the empty frequency modulation of peak-to-average power ratio time domain discrete data sample block processed, time domain and embed training sequence discrete sample block and directly superpose and form time domain and embed training sequence and fall peak-to-average power ratio sky frequency modulation time domain discrete data sample block processed, as frame;
9) each wireless digital broadcasting signal transmitter in single frequency network is that frame head inserts time domain and embeds training sequence to fall the empty frequency modulation of peak-to-average power ratio time domain discrete data sample block processed be frame using Cyclic Prefix as protection interval, to form signal frame, the length of Cyclic Prefix is C;
10) each wireless digital broadcasting signal transmitter in single frequency network adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
11) each wireless digital broadcasting signal transmitter in single frequency network forms emission of radio frequency signals to on-air radio channel by baseband signal up-conversion to carrier wave;
12) radiofrequency signal that each wireless digital broadcasting signal transmitter in the detection of the wireless digital broadcasting signal receiver in single frequency network reception single frequency network sends also forms baseband signal by its down-conversion, utilizes the architectural characteristic of training sequence characteristic and signal frame to carry out baseband signal reception & disposal.
According to the embodiment of the single frequency network transmitter signal framing modulation of Wireless digital broadcast signal transmission method for single frequency network of the present invention, as shown in Figure 2, be specifically implemented as follows:
The centre data manager of single frequency network converts the multi-medium 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.
The network data management device of single frequency network will be inputted data bit flow and on frequency domain, form FFT data block; To adopt code check be 1, and space-frequency coding device is modulated to the FFT data block forming on frequency domain on each wireless digital broadcasting signal transmitter branch road in single frequency network and forms empty frequency modulation FFT data block processed, and the time synchronized of adjusting each wireless digital broadcasting signal transmitter branch road is all processed empty frequency modulation FFT data block processed at one time with all transmitters in assurance network; Be transformed to sky frequency modulation time domain discrete data sample block processed through IFFT again, generate and choose the empty frequency modulation of peak-to-average power ratio time domain discrete data sample block processed of falling wherein with minimum peak-to-average power ratio by peak-to-average power ratio adjustment unit and the generate pattern information of institute's correspondence employing is sent to operational indicator sequence setting unit simultaneously.
Empty frequency modulation FFT data block processed is made up of subcarrier.The length of empty frequency modulation FFT data block processed is K, and the frequency interval of subcarrier is got the one in 2KHz, 4KHz, 1KHz.
The training sequence of each wireless digital broadcasting signal transmitter in single frequency network 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.
Each wireless digital broadcasting signal transmitter Insert service index series after training sequence in single frequency network forms time domain and embeds training sequence discrete sample block in time domain.
The operational indicator sequence of each wireless digital broadcasting signal transmitter in single frequency network has pseudo-random characteristics, is realized by one group of Phase shift m sequence; Each different operational indicator sequence of each wireless digital broadcasting signal transmitter in single frequency network is comprising and unique each system parameters and business model information of expressing single frequency network wireless digital broadcast signal transmitter.
The time domain of each wireless digital broadcasting signal transmitter in single frequency network embeds the length and the length numerically equal of falling the empty frequency modulation of peak-to-average power ratio time domain discrete data sample block processed of training sequence discrete sample block; Each wireless digital broadcasting signal transmitter in single frequency network will fall the empty frequency modulation of peak-to-average power ratio time domain discrete data sample block processed, time domain and embed training sequence discrete sample block and directly superpose and form time domain and embed training sequence and fall peak-to-average power ratio sky frequency modulation time domain discrete data sample block processed, as frame; Each wireless digital broadcasting signal transmitter in single frequency network is that frame head inserts time domain and embeds training sequence to fall the empty frequency modulation of peak-to-average power ratio time domain discrete data sample block processed be frame using Cyclic Prefix as protection interval, to form signal frame, the length of Cyclic Prefix is C; The circulating prefix-length C of each wireless digital broadcasting signal transmitter signal frame in single frequency network is 1/16 of FFT data block length K.
Each wireless digital broadcasting signal transmitter in single frequency network adopts square root raised cosine filter to carry out pulse shaping to the signal of signal frame.
Each wireless digital broadcasting signal transmitter in single frequency network forms emission of radio frequency signals to on-air radio channel by baseband signal up-conversion to carrier wave.
The radiofrequency signal that each wireless digital broadcasting signal transmitter in wireless digital broadcasting signal receiver detection reception single frequency network in single frequency network sends also forms baseband signal by its down-conversion, utilize the architectural characteristic of training sequence characteristic and signal frame to carry out baseband signal reception & disposal, comprising the time domain and frequency domain combined alternate analysis processing to signal frame head and signal frame body.
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 Wireless digital broadcast signal transmission method for single frequency network, is characterized in that it comprises the following steps:
1) the centre data manager of single frequency network converts the multi-medium 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 will be inputted data bit flow and on frequency domain, form FFT data block, and the length of FFT data block is K, and the numerical value of K is got even number;
3) to adopt code check be 1 to the network data management device of single frequency network that space-frequency coding device is modulated to the FFT data block forming on frequency domain on each wireless digital broadcasting signal transmitter branch road in single frequency network and forms empty frequency modulation FFT data block processed, and the time synchronized of adjusting each wireless digital broadcasting signal transmitter branch road is all processed empty frequency modulation FFT data block processed at one time with all transmitters in assurance network;
4) each wireless digital broadcasting signal transmitter in single frequency network adopts IFFT that FFT data block processed empty frequency modulation is transformed to sky frequency modulation time domain discrete data sample block D processed
total=[d
0, d
1..., d
k-2, d
k-1];
5) each wireless digital broadcasting signal transmitter in single frequency network separates successively and generates the strange sub-block D of empty frequency modulation time domain discrete data sample processed by time domain discrete data sample block demultiplexing processed empty frequency modulation and according to the sequencing odd even of each empty frequency modulation time domain discrete data sample processed
very=[d
0, d
2..., d
k-4, d
k-2] and the even sub-block D of empty frequency modulation time domain discrete data sample processed
even=[d
1, d
3..., d
k-3, d
k-1];
6) each wireless digital broadcasting signal transmitter in single frequency network passes through peak-to-average power ratio adjustment unit to the strange sub-block D of empty frequency modulation time domain discrete data sample processed
very, the even sub-block D of empty frequency modulation time domain discrete data sample processed
evencarry 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
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 empty frequency modulation time domain discrete data sample block D processed that generate pattern is synthetic
new, choose wherein there is minimum peak-to-average power ratio the empty frequency modulation of peak-to-average power ratio time domain discrete data sample block processed falls
and the empty frequency modulation of peak-to-average 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
* veryrepresent the strange sub-block D of empty frequency modulation time domain discrete data sample processed
veryeach empty frequency modulation time domain discrete data sample processed carry out conjugate operation processing and the empty frequency modulation time domain discrete data sample sub-block processed that obtains; D
* evenrepresent the even sub-block D of empty frequency modulation time domain discrete data sample processed
eveneach empty frequency modulation time domain discrete data sample processed carry out conjugate operation processing and the empty frequency modulation time domain discrete data sample sub-block processed that obtains;
7) each wireless digital broadcasting signal transmitter Insert service index series after training sequence in single frequency network forms time domain embedding 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 single frequency network wireless digital broadcast signal transmitter; Time domain embeds the length and the length numerically equal of falling the empty frequency modulation of peak-to-average power ratio time domain discrete data sample block processed of training sequence discrete sample block;
8) each wireless digital broadcasting signal transmitter in single frequency network will fall the empty frequency modulation of peak-to-average power ratio time domain discrete data sample block processed, time domain and embed training sequence discrete sample block and directly superpose and form time domain and embed training sequence and fall peak-to-average power ratio sky frequency modulation time domain discrete data sample block processed, as frame;
9) each wireless digital broadcasting signal transmitter in single frequency network is that frame head inserts time domain and embeds training sequence to fall the empty frequency modulation of peak-to-average power ratio time domain discrete data sample block processed be frame using Cyclic Prefix as protection interval, to form signal frame, the length of Cyclic Prefix is C;
10) each wireless digital broadcasting signal transmitter in single frequency network adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
11) each wireless digital broadcasting signal transmitter in single frequency network forms emission of radio frequency signals to on-air radio channel by baseband signal up-conversion to carrier wave;
12) radiofrequency signal that each wireless digital broadcasting signal transmitter in the detection of the wireless digital broadcasting signal receiver in single frequency network reception single frequency network sends also forms baseband signal by its down-conversion, utilizes the architectural characteristic of training sequence characteristic and signal frame to carry out baseband signal reception & disposal.
2. by the Wireless digital broadcast signal transmission method for single frequency network 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 Wireless digital broadcast signal transmission method for single frequency network of claim 1, it is characterized in that: described C gets 1/16 of K; Described G gets 1/8 of L.
4. by the Wireless digital broadcast signal transmission method for single frequency network 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 Wireless digital broadcast signal transmission method for single frequency network 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 Wireless digital broadcast signal transmission method for single frequency network of claim 1, it is characterized in that: the baseband signal reception & disposal that described single frequency network wireless digital broadcasting signal receiver carries out, one of them step is the time domain and frequency domain combined alternate analysis processing of signal frame head and signal frame body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410023947.4A CN103795672A (en) | 2014-01-13 | 2014-01-13 | Single-frequency-network wireless digital broadcast signal transmitting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410023947.4A CN103795672A (en) | 2014-01-13 | 2014-01-13 | Single-frequency-network wireless digital broadcast signal transmitting method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103795672A true CN103795672A (en) | 2014-05-14 |
Family
ID=50670967
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410023947.4A Pending CN103795672A (en) | 2014-01-13 | 2014-01-13 | Single-frequency-network wireless digital broadcast signal transmitting method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103795672A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107277566A (en) * | 2014-12-24 | 2017-10-20 | 上海数字电视国家工程研究中心有限公司 | Signalling coding modulator approach and demodulation coding method based on supercomposed coding |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007068077A1 (en) * | 2005-12-15 | 2007-06-21 | Nortel Networks Limited | System and method for reducing peak-to-average power ratio in orthogonal frequency division multiplexing signals using reserved spectrum |
| US20090003478A1 (en) * | 2006-01-13 | 2009-01-01 | Electronics And Telecommunications Research | Method and Apparatus for Generating and Receiving Ofdm Symbol |
| CN101778075A (en) * | 2010-03-03 | 2010-07-14 | 宁波大学 | Multimedia broadcast wireless signal anti-fading transmission method |
| CN102281242A (en) * | 2011-08-22 | 2011-12-14 | 宁波大学 | Wireless digital broadcast signal transmission method for single frequency network |
| CN102882670A (en) * | 2012-09-13 | 2013-01-16 | 电子科技大学 | Synchronous processing method based on CMMB signals |
-
2014
- 2014-01-13 CN CN201410023947.4A patent/CN103795672A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007068077A1 (en) * | 2005-12-15 | 2007-06-21 | Nortel Networks Limited | System and method for reducing peak-to-average power ratio in orthogonal frequency division multiplexing signals using reserved spectrum |
| US20090003478A1 (en) * | 2006-01-13 | 2009-01-01 | Electronics And Telecommunications Research | Method and Apparatus for Generating and Receiving Ofdm Symbol |
| CN101778075A (en) * | 2010-03-03 | 2010-07-14 | 宁波大学 | Multimedia broadcast wireless signal anti-fading transmission method |
| CN102281242A (en) * | 2011-08-22 | 2011-12-14 | 宁波大学 | Wireless digital broadcast signal transmission method for single frequency network |
| CN102882670A (en) * | 2012-09-13 | 2013-01-16 | 电子科技大学 | Synchronous processing method based on CMMB signals |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107277566A (en) * | 2014-12-24 | 2017-10-20 | 上海数字电视国家工程研究中心有限公司 | Signalling coding modulator approach and demodulation coding method based on supercomposed coding |
| CN107277566B (en) * | 2014-12-24 | 2020-04-17 | 上海数字电视国家工程研究中心有限公司 | Signaling coding modulation method and demodulation decoding method based on superposition coding |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103763249A (en) | Anti-interference wireless signal transmission method for digital broadcast | |
| CN103795672A (en) | Single-frequency-network wireless digital broadcast signal transmitting method | |
| CN103763264A (en) | Anti-noise wireless signal transmission method for digital broadcast single frequency network | |
| CN103763290A (en) | Method for framing and modulating anti-interference wireless multimedia broadcast signals in single frequency network | |
| CN103763287A (en) | Anti-fading wireless digital broadcast signal transmission method for single frequency network | |
| CN103763261A (en) | Anti-interference wireless signal transmission method for digital broadcast single frequency network | |
| CN103780533A (en) | Digital broadcasting single frequency network anti-interference mobile signal transmission method | |
| CN103763263A (en) | Wireless signal transmission method for digital broadcast single frequency network | |
| CN103763284A (en) | Anti-noise wireless digital broadcast signal transmission method for single frequency network | |
| CN103780563A (en) | Single-frequency network mobile digital broadcasting signal transmission method | |
| CN103780562A (en) | Mobile digital broadcasting signal transmission method | |
| CN103763257A (en) | Anti-interference transmission method for wireless digital radio signals | |
| CN103763288A (en) | Wireless multimedia broadcast signal framing modulation method for single frequency network | |
| CN103780564A (en) | Single-frequency network anti-noise mobile digital broadcasting signal transmission method | |
| CN103763259A (en) | Wireless digital broadcasting signal transmission method | |
| CN103780541A (en) | Single-frequency network anti-interference wireless digital broadcasting signal transmission method | |
| CN103780534A (en) | Anti-fading wireless digital broadcasting signal transmission method | |
| CN103780547A (en) | Anti-noise wireless signal framing modulation method for single frequency network in multimedia broadcasting | |
| CN103763289A (en) | Single frequency network anti-noise wireless multimedia broadcasting signal framing modulation method | |
| CN103780536A (en) | Digital broadcasting mobile signal transmission method | |
| CN103763292A (en) | Anti-interference mobile digital broadcasting signal transmission method | |
| CN103780546A (en) | Single-frequency network anti-fading wireless multimedia broadcasting signal framing modulation method | |
| CN103763282A (en) | Wireless multimedia broadcast signal framing modulation method | |
| CN103763268A (en) | Mobile multimedia broadcast signal framing modulation method for single frequency network | |
| CN103763293A (en) | Multimedia broadcasting single frequency network wireless signal framing modulation method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20140514 |