CN103763263A - Wireless signal transmission method for digital broadcast single frequency network - Google Patents
Wireless signal transmission method for digital broadcast single frequency network Download PDFInfo
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- CN103763263A CN103763263A CN201410022953.8A CN201410022953A CN103763263A CN 103763263 A CN103763263 A CN 103763263A CN 201410022953 A CN201410022953 A CN 201410022953A CN 103763263 A CN103763263 A CN 103763263A
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Abstract
The invention discloses a wireless 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 wireless 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 wireless signal transmission method for the digital broadcast single frequency network has the advantages of being low in peak-to-average power ratio, short in synchronization time, resistant to channel fading, multiple in controllable service and the like.
Description
Technical field
The invention belongs to wireless communication field, relate more specifically to a kind of transmitting wireless signals in digital broadcasting single frequency network.
Background technology
Digital Television digital broadcast single-frequency network wireless transmitting 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.Digital broadcast single-frequency network wireless signal transmitter framing modulation technique is the key technology of Digital Television wireless digital broadcasting system, for whole system performance, plays conclusive effect, 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 in the time of can resisting frequency selectivity and channel, becomes and extremely everybody concern obtain deep research and the 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 (that is, the same time of several transmitting stations is launched same signal to realize the reliable covering to certain coverage in same frequency) of single frequency network can greatly improve the availability of frequency spectrum of Digital Television digital broadcast single-frequency network wireless transmitting system.In actual single frequency network communication environment, Digital Television digital broadcast single-frequency network performance in wireless communication systems is subject to the impact of the factors such as lock in time, clock jitter, channel fading, channel disturbance.Each digital broadcasting wireless signals transmitter transmission method in single frequency network is the key technology that realizes reliable digit Television Digital broadcast single frequency network wireless transmission.
Utilizing Digital Television digital broadcast single-frequency network wireless transmitting 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 Digital broadcast single frequency network wireless transmitting system satisfies social needs.
Based on above background, the present invention is directed to practical communication environment and propose a kind of transmitting wireless signals in digital broadcasting single frequency network just, can meet High Data Rate and can control the needs of multi-service Digital Television digital broadcast single-frequency network wireless transmission.
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?communications”.
Boston：Artech?House，2000.
Y.Wu，S.Hirakawa，U.H.Reimers，andJ.Whitaker.“Overview?of?digital?television?development，”Proceedings?ofthe?IEEE，Special?Issue?on?Global?Digital?Television：Technology?andEmerging?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?onGlobalPigital?Television：TechnologyandEmergingServices，pp.37-43，Jan.2006.
U.Ladebusch?and?C.A.Li?ss.“Terrestrial?DVB(DVB-T)：A?broadcast?technology?for?stat?ionary?portable?and?mobileuse.”Proceedings?of?the?IEEE，Special?Issue?on?Global?Digital?Television：Technology?and?Emerging?Services，pp.183-194，Jan.2006.
M.Takada?and?M.Sai?to.“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 Television digital broadcast single-frequency network wireless issue, proposed a kind of transmitting wireless signals in digital broadcasting single frequency network.
A kind of transmitting wireless signals in digital broadcasting 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) the network data management device of single frequency network to adopt code check be 1 space-frequency coding device is modulated to the FFT data block forming on frequency domain in each digital broadcasting wireless signals transmitter branches in single frequency network, to form empty frequency modulation FFT data block processed, and the time synchronized of adjusting each digital broadcast single-frequency network wireless 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 digital broadcasting wireless signals 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 digital broadcasting wireless signals 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 digital broadcasting wireless signals 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
* veryexpression is to 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
* evenexpression is to 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 digital broadcasting wireless signals transmitter Insert service index series after training sequence in single frequency network 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 each digital broadcasting wireless signals transmitter in single frequency network;
8) each digital broadcasting wireless signals transmitter in single frequency network inserts and falls the empty frequency modulation of peak-to-average power ratio time domain discrete data sample block processed using Cyclic Prefix as protection interval, the empty frequency modulation of peak-to-average 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 broadcasting wireless signals transmitter in single frequency network is that frame head is inserted into that to fall the empty frequency modulation of peak-to-average power ratio time domain cyclic prefix discrete data sample block processed be frame by time-domain training sequence discrete sample block, to form signal frame;
10) each digital broadcasting wireless 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 broadcasting wireless signals 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 digital broadcasting wireless signals transmitter in the detection of the digital broadcasting wireless signals 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 above-mentioned transmitting wireless signals in digital broadcasting single frequency network, it is characterized in that: each digital broadcasting wireless signals 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 digital broadcasting wireless signals transmitter in single frequency network is comprised 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
*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, 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 digital broadcasting wireless signals transmitter signal frame in single frequency network is 1/16 of FFT data block length K, the operational indicator sequence of each digital broadcasting wireless signals transmitter in single frequency network has pseudo-random characteristics, by one group of Phase shift m sequence, is realized, each different operational indicator sequence of each digital broadcasting wireless signals transmitter in single frequency network is comprising and unique each system parameters and business model information of expressing each digital broadcasting wireless signals transmitter in single frequency network, the FFT data block of each digital broadcasting wireless signals transmitter in single frequency network is comprised 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.Digital broadcasting wireless signals receiver in single frequency network can make full use of the architectural characteristic of training sequence characteristic and signal frame and 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.
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 when 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 digital broadcasting wireless signals transmitter in single frequency network is obtained through certain optimisation design by permanent envelope zero auto-correlation CAZAC sequence and pseudorandom PN sequence, the signal frame of each digital broadcasting wireless signals transmitter in single frequency network is that frame head is inserted into that to fall the empty frequency modulation of peak-to-average power ratio time domain cyclic prefix discrete data sample block processed be frame and forming by time-domain training sequence discrete sample block, these have guaranteed that digital broadcast single-frequency network wireless 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.Using Cyclic Prefix as protection interval, insert and fall the empty frequency modulation of peak-to-average power ratio time domain discrete data sample block processed to form signal frame body, can reduce the interference effect between signal frame head and frame data.Each different operational indicator sequence of each digital broadcasting wireless signals transmitter in single frequency network is comprising and unique each system parameters and business model information of expressing each digital broadcasting wireless signals transmitter in single frequency network, can make Digital Television digital broadcast single-frequency network wireless transmitting 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 digital broadcast single-frequency network wireless transmission.
Accompanying drawing explanation
Fig. 1 is according to the embodiment schematic diagram of signal transmission between the transmitter and receiver of transmitting wireless signals in digital broadcasting single frequency network of the present invention.
Fig. 2 is the embodiment schematic diagram forming according to signal frame in signals transmission between the transmitter and receiver of transmitting wireless signals in digital broadcasting 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 schematic diagram of signal transmission between the transmitter and receiver of the transmitting wireless signals in digital broadcasting 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) the network data management device of single frequency network to adopt code check be 1 space-frequency coding device is modulated to the FFT data block forming on frequency domain in each digital broadcasting wireless signals transmitter branches in single frequency network, to form empty frequency modulation FFT data block processed, and the time synchronized of adjusting each digital broadcast single-frequency network wireless 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 digital broadcasting wireless signals 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 digital broadcasting wireless signals 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 digital broadcasting wireless signals 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
* veryexpression is to 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
* evenexpression is to 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 digital broadcasting wireless signals transmitter Insert service index series after training sequence in single frequency network 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 each digital broadcasting wireless signals transmitter in single frequency network;
8) each digital broadcasting wireless signals transmitter in single frequency network inserts and falls the empty frequency modulation of peak-to-average power ratio time domain discrete data sample block processed using Cyclic Prefix as protection interval, the empty frequency modulation of peak-to-average 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 broadcasting wireless signals transmitter in single frequency network is that frame head is inserted into that to fall the empty frequency modulation of peak-to-average power ratio time domain cyclic prefix discrete data sample block processed be frame by time-domain training sequence discrete sample block, to form signal frame;
10) each digital broadcasting wireless 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 broadcasting wireless signals 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 digital broadcasting wireless signals transmitter in the detection of the digital broadcasting wireless signals 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.
The embodiment that forms (suppose in single frequency network have N transmitter) according to signal frame in signals transmission between the transmitter and receiver of transmitting wireless signals in digital broadcasting single frequency network of the present invention, as shown in Figure 2, is 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 space-frequency coding device is modulated to the FFT data block forming on frequency domain in each digital broadcasting wireless signals transmitter branches in single frequency network, to form empty frequency modulation FFT data block processed, and the time synchronized of adjusting each digital broadcast single-frequency network wireless signal transmitter branch road is all processed empty frequency modulation FFT data block processed at one time with all transmitters in assurance network; Through IFFT, be transformed to sky frequency modulation time domain discrete data sample block processed again, by peak-to-average power ratio adjustment unit, 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 and the generate pattern information of institute's correspondence employing is sent to operational indicator sequence setting unit simultaneously.
The FFT data block of each digital broadcasting wireless signals transmitter in single frequency network is comprised of subcarrier, and the frequency interval of subcarrier is got the one in 2KHz, 4KHz, 1KHz.
The training sequence of each digital broadcasting wireless signals transmitter in single frequency network is comprised 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
*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; 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 digital broadcasting wireless signals transmitter Insert service index series after training sequence in single frequency network forms time-domain training sequence discrete sample block in time domain.
The operational indicator sequence of each digital broadcasting wireless signals transmitter in single frequency network has pseudo-random characteristics, by one group of Phase shift m sequence, is realized; Each different operational indicator sequence of each digital broadcasting wireless signals transmitter in single frequency network is comprising and unique each system parameters and business model information of expressing each digital broadcasting wireless signals transmitter in single frequency network.
Each digital broadcasting wireless signals transmitter in single frequency network inserts and falls the empty frequency modulation of peak-to-average power ratio time domain discrete data sample block processed using Cyclic Prefix as protection interval, the empty frequency modulation of peak-to-average power ratio time domain cyclic prefix discrete data sample block processed falls in formation, as frame, the length of Cyclic Prefix is C; Each digital broadcasting wireless signals transmitter in single frequency network is that frame head is inserted into that to fall the empty frequency modulation of peak-to-average power ratio time domain cyclic prefix discrete data sample block processed be frame by time-domain training sequence discrete sample block, to form signal frame; The circulating prefix-length C of each digital broadcasting wireless signals transmitter signal frame in single frequency network is 1/16 of FFT data block length K.
Each digital broadcasting wireless signals transmitter in single frequency network adopts square root raised cosine filter to carry out pulse shaping to the signal of signal frame.
Each digital broadcasting wireless signals 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 digital broadcasting wireless signals transmitter in digital broadcasting wireless signals 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 transmitting wireless signals in digital broadcasting 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) the network data management device of single frequency network to adopt code check be 1 space-frequency coding device is modulated to the FFT data block forming on frequency domain in each digital broadcasting wireless signals transmitter branches in single frequency network, to form empty frequency modulation FFT data block processed, and the time synchronized of adjusting each digital broadcast single-frequency network wireless 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 digital broadcasting wireless signals 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 digital broadcasting wireless signals 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 digital broadcasting wireless signals 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
* veryexpression is to 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
* evenexpression is to 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 digital broadcasting wireless signals transmitter Insert service index series after training sequence in single frequency network 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 each digital broadcasting wireless signals transmitter in single frequency network;
8) each digital broadcasting wireless signals transmitter in single frequency network inserts and falls the empty frequency modulation of peak-to-average power ratio time domain discrete data sample block processed using Cyclic Prefix as protection interval, the empty frequency modulation of peak-to-average 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 broadcasting wireless signals transmitter in single frequency network is that frame head is inserted into that to fall the empty frequency modulation of peak-to-average power ratio time domain cyclic prefix discrete data sample block processed be frame by time-domain training sequence discrete sample block, to form signal frame;
10) each digital broadcasting wireless 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 broadcasting wireless signals 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 digital broadcasting wireless signals transmitter in the detection of the digital broadcasting wireless signals 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 transmitting wireless signals in digital broadcasting single frequency 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 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
*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.
3. by the transmitting wireless signals in digital broadcasting 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 transmitting wireless signals in digital broadcasting single frequency network of claim 1, it is characterized in that: described operational indicator sequence has pseudo-random characteristics, by one group of Phase shift m sequence, realized.
5. by the transmitting wireless signals in digital broadcasting single frequency network of claim 1, it is characterized in that: described FFT data block is comprised of subcarrier, and the frequency interval of subcarrier is got the one in 2KHz, 4KHz, 1KHz.
6. by the transmitting wireless signals in digital broadcasting single frequency network of claim 1, it is characterized in that: the baseband signal reception & disposal that described digital broadcast single-frequency network wireless 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.
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