CN1625256A - Transmission method for raio multimedic broadcast system and its system - Google Patents
Transmission method for raio multimedic broadcast system and its system Download PDFInfo
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Abstract
The invention provides a transmitting method and system for wireless multimedia broadcasting system, where the method includes the following steps: according to the property of each channel data that needs transmitting, determining logic channel and modulating solution needed to transmit each channel data; allocating the logic channel to each channel data and making coding interlace on the logic channel; making mapping and frame-forming operation on the signal through the coding interlace; scrambling operation; modulating the signal; able to combine many logic channels according to the transmitted data property, or dividing them each into many subchannels, where the modulating types and coding modes for these logic channels are mutually independent. Thus it realizes flexible data channel configuration according to different application requirements, provides coding protection at different grades, and provides multiple services largely beyond the range of one-way broadcast. It assures the performance and implementing efficiency of data transmission in different packet lengths and provides an open platform for wideband wireless communication.
Description
Technical field
The present invention relates to digital television system, relate in particular to a kind of data transmission method that is used for the mutual broadcasting of ground multimedia, is a kind of transmission method and system thereof that is used for wireless multimedia broadcasting system specifically.
Background technology
Existing terrestrial digital television system (as DVB-T) mainly provides unidirectional television services.Data structure is confined to certain specific video form, and promptly therefore MPEG-2 lacks the flexibility of development multimedia service.For example, the signal of importing in the DVB-T system is encoded as bigger code block, wants to extract separately short and small information and must carry out monoblock decoding.This has brought very big restriction with regard to giving to be characterized as portable/mobile terminal device mobile and low-power consumption usually.
Growing user's request requires following terrestrial television networks transmission of high distinctness TV signal, interactive program and wide-band bidirectional business simultaneously.Particularly, system should be able to support a plurality of data flow, supports long (for example video code flow) and short (for example data and voice) two kinds of long packets of bag, but requires flexible data channel configuration according to different application, and the coding protection of different brackets is provided.
Summary of the invention
One of purpose of the present invention is for providing a kind of transmission method that is used for wireless multimedia broadcasting system.May further comprise the steps: the characteristic of Chuan Shu each circuit-switched data as required, determine the required logic channel of each circuit-switched data of transmission, modulation scheme and control signal; According to the logic channel of determining, modulation scheme and control signal are described each circuit-switched data assignment logic channel, and logic channel is separately carried out code interleaving separately respectively; Signal behind the code interleaving is shone upon; Signal after the mapping is carried out the framing operation; Signal after the framing is added the scrambler operation; The signal that adds above-mentioned adding scrambler is modulated; Signal after the modulation is launched.Logic channel is by data-signal and subcarrier are shone upon, and making the data-signal ordering is a n dimensional vector n, and a n dimensional vector n is advised class obtains.Described a plurality of logic channel can with its merging, be divided into a plurality of subchannels with it according to the data characteristic of transmission, the modulation type of described a plurality of logic channels, and coded system is independent mutually.Described control signal is by shortening BCH code (54,30) protection.Described shortening BCH code (54,30) be from primal system sign indicating number BCH (63,39, t=4) derive.To being modulated to of described control signal: control signal is evenly distributed on the time-frequency grid in the frame, with (wherein m and n are respectively frequency and time shaft indication for m, the n) position coordinates of indication control signal.M, n value rule are as follows:
Under the 1K pattern: m=3p+1, n=4q+1, p=0,1,2 ... 259, q=0,1,2 ... 38/42/44 (correspond respectively to 1/4,1/8,1/16CP).
Under the 4K pattern: m=4p+1, n=3q+1 p=0,1,2 ... 779, q=0,1,2 ..., 12/13/14 correspond respectively to 1/4,1/8,1/16CP)
Wherein, p is the sequence number of control signal symbol in a frame, and q represents the sequence number of each control signal symbol sub-carriers, and each control signal is carried 2 bits, with 4 orthogonal code modulation.Described each control signal is carried 2 bits, is meant under the 1K pattern with 4 orthogonal code modulation, and information bit is 00, and code word is H
100, information bit is 01, code word is H
150, information bit is 10, code word is H
200, information bit is 11, code word is H
250Under the 4K pattern, information bit is 00, and code word is H
100H
100H
100, information bit is 01, code word is H
150H
150H
150, information bit is 10, code word is H
200H
200H
200, information bit is 11, code word is H
250H
250H
250H wherein
nRepresent the n of 256 * 256 Hadamard matrixes capable, fill up 40 sequence form that become at 260.Described control signal wraps in and repeats transmission in each frame.In described modulation intelligence, insert a beacon signal and think that initial time and Frequency Synchronization provide reference highly reliably, transmit crucial modem information, for example FFT number and circulating prefix-length make physical layer get final product these information of correct demodulation before data decode.
Another object of the present invention is for providing a kind of transmission system that is used for wireless multimedia broadcasting system.It is to adopt an above-mentioned system that is used for the transmission method of wireless multimedia broadcasting system, comprising: a Data Receiving unit, a control unit, one coding unit, a constellation mapping unit, one one-tenth frame unit, one scrambler unit, a modulating unit, a data transmission unit; Described Data Receiving unit and described coding unit link, described coding unit and described constellation mapping unit now join, described constellation mapping unit links with becoming frame unit, described one-tenth frame unit and scrambler unit link, described scrambler unit and described modulating unit link, described modulating unit and described data transmission unit link, described Data Receiving unit, one control unit, a coding unit, a constellation mapping unit, one one-tenth frame unit, one scrambler unit, a modulating unit, a data transmission unit all links with control unit, wherein said control unit can be according to the characteristic of received data, determine the required system information of each circuit-switched data of transmission, and this system information deposited in the control signal that described control unit carries out the coding of data according to control signal information, mapping, framing, scrambler, modulation.Described system information comprises logic channel configuration, modulation type, encoding scheme, the system information of frame number and regional identifying information at least.Control unit is described each circuit-switched data assignment logic channel according to control signal, and the scheme of definite logic channel code interleaving, the modulation scheme of signal.
The present invention has following feature: 1. multipotency is supported 4 independent data stream, and every circuit-switched data stream has different modulation and coded system, considers with compromise between system data rate and robustness.2. TV signal and data message are adopted " long code " and " short code " respectively, be suitable for TV and data with broadcasting.3. to transparent, the reconfigurable phy interface of the data flow of video and other form.4. beacon signal provides basic modulation parameter highly reliably; but fast demodulation beneficial effect of the present invention is for supporting a plurality of data flow; support long (for example video code flow) and short (for example data and voice) two kinds of long packets of bag; but require flexible data channel configuration according to different application, the coding protection of different brackets is provided.
Beneficial effect of the present invention is for supporting a plurality of data flow; support long (for example video code flow) and short (for example data and voice) two kinds of long packets of bag; but require flexible data channel configuration according to different application; the coding protection of different brackets is provided, the multiple business of One-to-All Broadcast scope head and shoulders above is provided.Guarantee the performance of the transfer of data that different bags are long and implemented efficient.The platform of an opening is provided for broadband wireless communications.Be a very big breakthrough than before.In the Previous System, the pilot signal of OFDM is only for the synchronous usefulness of indication, and other parameters need could obtain after data decode, and this shortcoming is overcome in the present invention, and ofdm system parameter (FFT number and Cyclic Prefix) can promptly obtain before data decode.
Description of drawings
Fig. 1 is a kind of configuration schematic diagram possible according to the logic channel of an embodiment of the method for the invention.
Fig. 2 is the modulator-demodulator block diagram according to one embodiment of the invention.
Fig. 3 is the beacon infrastructure according to an embodiment of the method for the invention.
Fig. 4 carries information chart according to the beacon signal of an embodiment of the method for the invention.
Fig. 5 is according to the data-signal of an embodiment of the method for the invention and the mapping table of logic channel.
Fig. 6 is the keychart according to the information bit of the control signal of an embodiment of the method for the invention.
Fig. 7 is the keychart according to the modulation intelligence bit of the control signal of an embodiment of the method for the invention.
Fig. 8 is the keychart according to the encoding rate information bit of the control signal of an embodiment of the method for the invention.
Fig. 9 is the keychart according to the logic channel configuration information bit of the control signal of an embodiment of the method for the invention.
Figure 10 is the modulation according to the control signal of an embodiment of the method for the invention.
Figure 11 A, 11B are the control signal distribution on the time-frequency grid under 1K and 4K pattern respectively according to an embodiment of the method for the invention.
Figure 12 is the embodiment schematic diagram according to device of the present invention.
Embodiment
Below in conjunction with accompanying drawing, it is as follows that the embodiment of the invention is elaborated:
With reference to figure 2, a kind of transmission method that is used for wireless multimedia broadcasting system, the characteristic of each circuit-switched data that it transmits is as required determined the required logic channel of each circuit-switched data of transmission, modulation scheme and control signal; According to the logic channel of determining, modulation scheme and control signal are described each circuit-switched data assignment logic channel, and logic channel is separately carried out code interleaving separately respectively; Signal behind the code interleaving is shone upon; Signal after the mapping is carried out the framing operation; Signal after the framing is added the scrambler operation; The signal that adds above-mentioned adding scrambler is modulated; Signal after the modulation is launched.With reference to figure 1, at first utilize 4 logic channel LC1, LC2, LC3, LC4.The configuration of 4 logic channels is by the control signal regulation, and data-signal is by carrier transmit, and the mapping definition of logic channel and subcarrier is as follows: supposition d
MnBe a data-signal, m and n indicate its subcarrier and time preface in an OFDM frame respectively.All data-signals are sorted as one one n dimensional vector n in one frame, are expressed as:
Wherein n, m do not belong to the sequence number of pilot tone and control signal.The groups elements of data vector is referred to 4 logic channels, and referring to the definition that Figure 5 shows that logic channel, logic channel 1 is defined as d
8kd
8k+1, k=0,1,2 ..., logic channel 2 is defined as d
8k+2d
8k+3, k=0,1,2 ..., logic channel 3 is defined as d
8k+4d
8k+5, k=0,1,2 ..., logic channel 4 is defined as d
8k+6d
8k+7, k=0,1,2 ....The configuration mode of the modulating-coding of each channel is independent mutually, the configuration of each logic channel is identified by the control signal in the control unit, referring to the control signal form that Figure 6 shows that in the control unit, control signal is carried important system information, as modulation scheme, encoding rate, frame number, logic channel configuration or the like.Following information is carried by control signal: logic channel configuration, modulation type and coded system, frame number, zone identification.Each control signal bag comprises 30 information bits, 30 following configurations of information bit, wherein 2 * 4 bits are used to identify the modulation scheme of 4 logic channels, the modulation scheme of each logic channel identifies with 2 bits, 3 * 4 bits are used to identify the encoding rate of 4 logic channels, and the encoding rate of each logic channel identifies with 3 bits, and 2 bits are used to identify the OFDM frame number, 2 various combination modes that bit is a logic channel in addition, other 6 bit is for keeping the position.Referring to Fig. 9, configuration with 2 each logic channels of bit identification, two bits are 00, identify four logic channels and form a hyper channel, be LC1, LC2, LC3, LC4 is a hyper channel, two bits are 01, identify 4 logic channels and form two medium channels, i.e. LC1, LC2 forms a medium channel, LC3, LC4 forms a medium channel, and two bits are 10, identifies 4 logic channels and forms a medium channel, two little channels, be LC1, LC2 forms a medium channel, and LC3 is a little channel, LC4 is a little channel, two bits are 11, identify 4 logic channels and form four little channels, i.e. LC1, LC2, LC3, LC4 respectively are a little channel, and 4 such logic channels just can be divided into channel greatly according to the practical business demand, little, in three class channels, identify the encoding rate of each logic channel with 3 bits, with reference to figure 8, be 000 as bit, the identification code rate is a long code 1/2, as bit is 001, the identification code rate is a long code 5/8, is 010 as bit, and the identification code rate is a long code 8/9, as bit is 011, the identification code rate is a short code 1/2, is 100 as bit, and the identification code rate is a short code 3/4, as bit is 101, the identification code rate is a short code 8/9, and bit 110 and 111 is as keeping, and the modulation scheme of 4 logic channels identifies with 2 bits, with reference to figure 7, as bit is 00, and the modulation scheme that identifies this channel is QPSK, is 01 as bit, the modulation scheme of this channel is 16-QAM, as bit is 10, and the modulation scheme that identifies this channel is that 64-QAM such as bit are 11, and the modulation scheme of channel is for keeping.
There are three kinds of input signals to come in referring to Fig. 1, be respectively high definition TV HDTV program, SDTV program and message, be these three kinds of signal allocation logic channels, because high definition TV HDTV program, some characteristics of SDTV program and message, code check for example, transmission environment, determined to use a medium logic channel this moment, and use long LDPC encoding scheme that the HDTV program is encoded, use a little logic channel and use long LDPC encoding scheme that the SDTV program is encoded, use a little logic channel, and use short LDPC encoding scheme that message is encoded, promptly control signal corresponding is determined, comes transmission of high distinctness TV HDTV program so logic channel 1 and logic channel 2 are merged into a medium channel of channel, so give the SDTV program as a little channel allocation, so give message as a little channel allocation with logic channel 4 with logic channel 3.So just utilize the encoding rate of each self-channel and modulation scheme channel is encoded and to modulate.
Also transmission of control signals on logic channel.Control signal wraps in and repeats transmission in each frame, repeats 5 times under repetition 1 time, 1k pattern under the 4K pattern.
The modulation of control signal is as follows: control signal is evenly distributed on the time-frequency grid, as shown in figure 11 in the frame.With (wherein m and n are respectively frequency and time shaft indication for m, the n) position coordinates of indication control signal.M, n value rule are as follows:
Under the 1K pattern: m=3p+1, n=4q+1, p=0,1,2 ... 259, q=0,1,2 ... 38/42/44 (correspond respectively to 1/4,1/8,1/16CP).
Under the 4K pattern: m=4p+1, n=3q+1 p=0,1,2 ... 779, q=0,1,2 ..., 12/13/14 correspond respectively to 1/4,1/8,1/16CP)
Wherein, p is the sequence number of control signal symbol in a frame, and q represents the sequence number of each control signal symbol sub-carriers.
Each control signal symbol carries 2 bits, and with 4 orthogonal code modulation, these information bits can be used the non-coherent demodulation method demodulation at receiving terminal.
As shown in figure 10, under the 1K pattern, information bit is 00, and code word is that the 100th row of Hadamard matrix is filled up 40 sequence form that become at 260.By that analogy, corresponding Figure 10, wherein H
nRepresent the n of 256 * 256Hadamard matrix capable, fill up 40 sequence form that become at 260.
135/27 (corresponding 1K or 4K pattern respectively) the above-mentioned orthogonal code modulation of individual control signal symbol that begins most.Therefore, every control frame signal carries 270/54 bit, for (54,30) control signal bag, can repeat 5/1 time (corresponding respectively to the 1K/4K pattern).Other control signal in one frame is modulated with complete 1 fixedly pattern.
According to the present invention, the control signal bag is by shortening BCH code (54,30) protection.This shorten sign indicating number from primal system sign indicating number BCH (63,39, t=4) derive, generator polynomial is:
h(x)＝x
24+x
23+x
22+x
20+x
19+x
17+x
16+x
13+x
10+x
9+x
8+x
6+x
5+x
4+x
2+x+1
In the present invention, in the information of modulation, insert beacon signal periodically, think that initial time and Frequency Synchronization provide reference highly reliably and transmit crucial modem information, for example FFT number and circulating prefix-length make physical layer get final product these information of correct demodulation before data decode.A kind of beacon infrastructure of embodiment for this reason shown in Figure 3.The short synchronizing symbol S (1) that 2 identical long synchronizing symbol L (1), L (2) back are 8 modulation is to S (8): long synchronizing symbol: the CDMA sequence that frequency band is limited: take the 7.6MHz bandwidth among the 10MHz; Length is 1023 samplings; Generator polynomial: x
10+ x
9+ x
8+ x
6+ x
4+ x
2+ 1; Two long Synchronization Design are identical; Transmitting power improves 3dB with respect to common OFDM symbol; Synchronously short: the CDMA sequence that frequency band is limited: take the 7.6MHz bandwidth among the 10MHz; Length is 255 samplings; Production is x
8+ x
4+ x
3+ x
2+ 1; 7 bits are carried in difference BPSK modulation; The short extra synchronously rotation of all even number prefaces π/4.In the present embodiment, beacon signal has been carried the crucial modulation intelligence of 3 bits, is protected by (7,3) Hamming code.For the ofdm system of example among Fig. 2, this 3 bit information correspondence the operator scheme shown in Fig. 4 form.Information bit is 000, and sign FFT number is 1K, and Cyclic Prefix is 1/4, information bit is 001, and sign FFT number is 1K, and Cyclic Prefix is 1/8, information bit is 010, and sign FFT number is 1K, and Cyclic Prefix is 1/16, information bit is 011, and sign FFT number is 1K, and Cyclic Prefix is 1/32 (reservation), information bit is 100, and sign FFT number is 4K, and Cyclic Prefix is 1/4, information bit is 101, and sign FFT number is 4K, and Cyclic Prefix is 1/8.
A kind of transmission system that is used for wireless multimedia broadcasting system comprises: a Data Receiving unit, a control unit, a coding unit, a constellation mapping unit, one one-tenth frame unit, a scrambler unit, a modulating unit, a data transmission unit; Described Data Receiving unit and described coding unit link, described coding unit and described constellation mapping unit link, described constellation mapping unit links with becoming frame unit, described one-tenth frame unit and scrambler unit link, described scrambler unit and described modulating unit link, and described modulating unit and described data transmission unit link, described Data Receiving unit, one coding unit, one constellation mapping unit, one one-tenth frame unit, a scrambler unit, one modulating unit, one data transmission unit all links with control unit, and wherein said control unit can be determined the required system information of each circuit-switched data of transmission according to the characteristic of received data, and this system information deposited in the control signal, described control unit carries out the coding of data according to control signal information, mapping, framing, scrambler, modulation.Described system information comprises logic channel configuration, modulation type, encoding scheme, the system information of frame number and regional identifying information at least.Control unit is described each circuit-switched data assignment logic channel according to control signal, and the scheme of definite logic channel code interleaving, the modulation scheme of signal.
Receive three kinds of input signals referring to Fig. 1 receiving element, be respectively high definition TV HDTV program, SDTV program and message, control unit is these three kinds of signal allocation logic channels, because high definition TV HDTV program, some characteristics of SDTV program and message, code check for example, transmission environment, determined to use a medium logic channel this moment, and use long LDPC encoding scheme that the HDTV program is encoded, use a little logic channel and use long LDPC encoding scheme that the SDTV program is encoded, use a little logic channel, and use the LDPC encoding scheme that message is encoded, promptly control signal corresponding is determined, so control unit is merged into a medium channel allocation of channel to high definition TV HDTV program according to control signal with logic channel 1 and logic channel 2, give the SDTV program with logic channel 3 as a little channel allocation, so give message as a little channel allocation with logic channel 4.Data-signal and control signal like this, by the control of control unit, encoded unit and modulating unit are encoded to channel and are modulated.
The modulation of control signal is as follows: control signal is evenly distributed on the time-frequency grid, as shown in figure 11 in the frame.With (wherein m and n are respectively frequency and time shaft indication for m, the n) position coordinates of indication control signal.M, n value rule are as follows:
Under the 1K pattern: m=3p+1, n=4q+1, p=0,1,2 ... 259, q=0,1,2 ... 38/42/44 (correspond respectively to 1/4,1/8,1/16CP).
Under the 4K pattern: m=4p+1, n=3q+1 p=0,1,2, ... 779, q=0,1,2, ..., 12/13/14 correspond respectively to 1/4,1/8,1/16CP) wherein, p is the sequence number of control signal symbol in a frame, q represents the sequence number of each control signal symbol sub-carriers.
Each control signal symbol carries 2 bits, and with 4 orthogonal code modulation, these information bits can be used the non-coherent demodulation method demodulation at receiving terminal.
As shown in figure 10, under the 1K pattern, information bit is 00, and code word is that the 100th row of Hadamard matrix is filled up 40 sequence form that become at 260.By that analogy, corresponding Figure 10, wherein Hn represents the n of 256 * 256Hadamard matrix capable, fills up 40 sequence form that become at 260.
135/27 (corresponding 1K or 4K pattern respectively) the above-mentioned orthogonal code modulation of individual control signal symbol that begins most.Therefore, every control frame signal carries 270/54 bit, for (54,30) control signal bag, can repeat 5/1 time (corresponding respectively to the 1K/4K pattern).Other control signal in one frame is modulated with complete 1 fixedly pattern.
The ground multimedia interactive broadcast system that the present invention is made up of one or more logic channels, each logic channel can transmit information source independence, the different data-signal of code check, each channel can be according to the data flow of the different bag/block lengths of different application transmission, and a plurality of logic channels are merged into the stream of a single logic channel with the transmission High Data Rate.Periodically insert beacon signal, to carry the basic parameter of modem initialization demodulation, beacon signal is made up of long and short frequency expansion sequence, and the FFT number of OFDMmodem and circulating prefix-length are by the beacon signal transmission.Control signal is carried system parameter message, control signal is carried the logic channel configuration parameter, control signal is carried the modulating-coding parameter, control signal is carried frame information and regional identifying information, control bit is represented by the different code words that are distributed on the time-frequency domain, the adaptive coding and modulating scheme is adopted in broadcasting, and the video code flow that interweaves for needs length adopts long code, adopts short code for the application of the type of message of quick feedback.
Above embodiment only is used for illustrating the present invention, is not to be used for limiting the present invention.
Claims (22)
1. transmission method that is used for wireless multimedia broadcasting system may further comprise the steps:
The characteristic of Chuan Shu each circuit-switched data is determined the required logic channel of each circuit-switched data of transmission, modulation scheme and control signal as required;
According to the logic channel of determining, modulation scheme and control signal are described each circuit-switched data assignment logic channel, and logic channel is separately carried out code interleaving separately respectively;
Signal behind the code interleaving is shone upon;
Signal after the mapping is carried out the framing operation;
Signal after the framing is added the scrambler operation;
The signal that adds above-mentioned adding scrambler is modulated;
Signal after the modulation is launched.
2. method according to claim 1 is characterized in that, logic channel is by data-signal and subcarrier are shone upon, and making the data-signal ordering is a n dimensional vector n, and a n dimensional vector n is advised class obtains.
3. method according to claim 2 is characterized in that, described data-signal and subcarrier mapping relations are:
Wherein n, m do not belong to the sequence number of pilot tone and control signal.
4. method according to claim 2 is characterized in that, a n dimensional vector n is advised class obtain logic channel and be meant: logic channel 1 is defined as d
8kd
8k+1, k=0,1,2 ..., logic channel 2 is defined as d
8k+2d
8k+3, k=0,1,2 ..., logic channel 3 is defined as d
8k+4d
8k+5, k=0,1,2 ..., logic channel 4 is defined as d
8k+6d
8k+7, k=0,1,2 ...
5. transmission method according to claim 1 is characterized in that, described a plurality of logic channels can be according to the data characteristic of transmission, with its merging.
6. transmission method according to claim 1 is characterized in that, described logic channel can be divided into a plurality of subchannels with it according to the data characteristic of transmission.
7. transmission method according to claim 1 is characterized in that, the modulation type of described a plurality of logic channels is independent mutually.
8. transmission method according to claim 1 is characterized in that, the coded system of described a plurality of logic channels is independent mutually.
9. transmission method according to claim 1 is characterized in that, described control signal is carried logic channel configuration, modulation type, encoding scheme, the system information of frame number and regional identifying information at least.
10. transmission method according to claim 9, it is characterized in that, described control signal comprises 30 information bits, 30 following configurations of information bit, wherein 2 * 4 bits are used to identify the modulation scheme of 4 logic channels, the modulation scheme of each logic channel identifies with 2 bits, 3 * 4 bits are used to identify the encoding rate of 4 logic channels, the encoding rate of each logic channel identifies with 3 bits, 2 bits are used to identify the OFDM frame number, 2 various combination modes that bit is a logic channel in addition, other 6 bit is for keeping the position.
11. transmission method according to claim 1 is characterized in that, described control signal is by shortening BCH code (54,30) protection.
12. transmission method according to claim 11 is characterized in that, described shortening BCH code (54,30) be from primal system sign indicating number BCH (63,39, t=4) derive, the multinomial of generation is:
h(x)＝x
24+x
23+x
22+x
20+x
19+x
17+x
16+x
13+x
10+x
9+x
8+x
6+x
5+x
4+x
2+x+1。
13. transmission method according to claim 1, it is characterized in that to being modulated to of described control signal: control signal is evenly distributed on the time-frequency grid in the frame, with (m, n) position coordinates of indication control signal, wherein m and n are respectively frequency and time shaft indication.M, n value rule are as follows:
Under the 1K pattern: m=3p+1, n=4q+1, p=0,1,2 ... 259, q=0,1,2 ... 38/42/44 (corresponding respectively to 1/4,1/8,1/16 CP).
Under the 4K pattern: m=4p+1, n=3q+1 p=0,1,2 ... 779, q=0,1,2 ..., 12/13/14 corresponds respectively to 1/4,1/8,1/16 CP)
Wherein, p is the sequence number of control signal symbol in a frame, and q represents the sequence number of each control signal symbol sub-carriers, and each control signal is carried 2 bits, with 4 orthogonal code modulation.
14. transmission method according to claim 13 is characterized in that, described each control signal is carried 2 bits, is meant under the 1K pattern with 4 orthogonal code modulation, and information bit is 00, and code word is H
100, information bit is 01, code word is H
150, information bit is 10, code word is H
200, information bit is 11, code word is H
250Under the 4K pattern, information bit is 00, and code word is H
100H
100H
100, information bit is 01, code word is H
150H
150H
150, information bit is 10, code word is H
200H
200H
200, information bit is 11, code word is H
250H
250H
250H wherein
nRepresent the n of 256 * 256Hadamard matrix capable, fill up 40 sequence form that become at 260.
15. transmission method according to claim 1 is characterized in that, described control signal wraps in and repeats transmission in each frame.
16. transmission method according to claim 15 is characterized in that, described control signal wraps under the 4K pattern, repeats 1 time, under the 1K pattern, repeats 5 times.
17. transmission method according to claim 1, it is characterized in that, in described modulation intelligence, insert a beacon signal and think that initial time and Frequency Synchronization provide reference highly reliably, transmit crucial modem information, for example FFT number and circulating prefix-length make physical layer get final product these information of correct demodulation before data decode.
18. transmission method according to claim 17, it is characterized in that, it is that the short synchronizing symbol S (1) of 8 modulation is to S (8) that the structure of described beacon signal can be 2 identical long synchronizing symbol L (1), L (2) back, length is the limited CDMA sequence of frequency band synchronously, take the 7.6MHz bandwidth among the 10MHz, length is 1023 samplings, generator polynomial: x
10+ x
9+ x
8+ x
6+ x
4+ x
2+ 1
Two long Synchronization Design are identical; Short is the limited CDMA sequence of frequency band synchronously, takies the 7.6MHz bandwidth among the 10MHz, and length is 255 samplings, and production is x
8+ x
4+ x
3+ x
2+ 1.
19. transmission method according to claim 18 is characterized in that, the transmitting power of described long synchronizing signal improves 3dB with respect to common OFDM symbol; 7 bits are carried in difference BPSK modulation, the short extra synchronously rotation of all even number prefaces π/4.
20. a transmission system that is used for wireless multimedia broadcasting system comprises: a Data Receiving unit, a control unit, a coding unit, a constellation mapping unit, one one-tenth frame unit, a scrambler unit, a modulating unit, a data transmission unit; Described Data Receiving unit and described coding unit link, described coding unit and described constellation mapping unit now join, described constellation mapping unit links with becoming frame unit, described one-tenth frame unit and scrambler unit link, described scrambler unit and described modulating unit link, described modulating unit and described data transmission unit link, described Data Receiving unit, a control unit, a coding unit, one constellation mapping unit, one one-tenth frame unit, a scrambler unit, a modulating unit, one data transmission unit all links with control unit, it is characterized in that described control unit can be determined the required system information of each circuit-switched data of transmission according to the characteristic of received data, and this system information deposited in the control signal, described control unit carries out the coding of data according to control signal information, mapping, framing, scrambler, modulation.
21. system according to claim 20 is characterized in that, described system information comprises logic channel configuration, modulation type, encoding scheme, the system information of frame number and regional identifying information at least.
22. system according to claim 20 is characterized in that, control unit is described each circuit-switched data assignment logic channel according to control signal, and the scheme of definite logic channel code interleaving, the modulation scheme of signal.
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