CN101707584A - Method for applying hierarchical modulation technology in T-MMB system - Google Patents

Abstract

The invention provides a hierarchical modulation method used for a transmitting terminal, which comprises that: a T-MMB service passes through a TS stream to separate out a high-priority code stream and a low-priority code stream, and two code streams are respectively subjected to respective condition access control, energy diffusion and channel coding, and then interwoven into a group of code stream; and the group of code stream is mapped according to hierarchical modulation information in a fast information channel FIC, and then is subjected to differential modulation, OFDM modulation and D/A conversion to be transmitted at a front end by an antenna. The invention also provides a hierarchical modulation method used for a receiving terminal, which comprises the following steps: by decoding quick information of a service organization area and a sub-channel organization area in the fast information channel FIC, filtering out the hierarchical modulation information, and decoding various sub-channels according to the hierarchical modulation information; if receiving signals are good, decoding the high-priority code stream and the low-priority code stream, and then merging and sending to a source decoder; and if the receiving signals are poor, only decoding the high-priority code stream, and sending to the source decoder.

Description

The method of applying hierarchical modulation technology in the T-MMB system

The application is to be that November 8, application number in 2006 are 200610137867.7 the applying date, and denomination of invention is divided an application for the application of " method of applying hierarchical modulation technology in the T-MMB system ".

Technical field

The invention provides a kind of emission/reception mobile multimedia digital broadcast system (T-MMB) service method, in particular, a kind of to the professional method that adopts hierarchical modulation technology emission/reception of T-MMB.

Background technology

Along with growth in the living standard, people are also more and more higher to the requirement of broadcasting tonequality.So broadcasting begins the change from AM to FM, the innovation from the analog broadcasting to the digital broadcasting.Particularly the appearance of digital broadcasting becomes a breakover point on the broadcasting development history, has revolutionary meaning with regard to this field.The generation of digital broadcasting is actually the sound that provided for FM broadcasting before overcoming in qualitative limitation, digital audio broadcasting (DAB) at present is in ground operations such as Europe, Canada, the U.S., and China has also made the trial of a lot of helpfulnesses on the one hand at this.

Ground mobile multimedia broadcast (Terrestrial Mobile MultimediaBroadcasting, T-MMB) system compatible digital audio broadcasting DAB, support the more modulation system of high-order, as 8DPSK or 16DAPSK, improved the availability of frequency spectrum, the utilization time-division multiplexing method can transmit more Polymera in the bandwidth identical with DAB.The T-MMB business also adopts more advanced LDPC coding except supporting original convolutional encoding, error correcting capability is stronger.

The time-multiplexed method of utilization can be transmitted the DAB business simultaneously in a plurality of subchannels in the T-MMB system, the DAB-IP business, and the professional and T-MMB business of T-DMB, as shown in Figure 1, better compatible.

With reference to figure 2, except supporting original convolutional encoding, also adopt more advanced LDPC coding in the T-MMB system, error correcting capability is stronger and chnnel coding is more flexible.

With reference to figure 3, the T-MMB system supports the more modulation system of high-order, as 8DPSK or 16DAPSK, has improved the availability of frequency spectrum, can transmit more Polymera like this in the bandwidth identical with DAB.

Because the influence that the ground environment of the restriction of transmitting power or complexity and high order modulation are brought can not normally receive service some local user.

Summary of the invention

The invention provides a kind of method that in the T-MMB system, the T-MMB business is adopted hierarchical modulation technology, comprising:

At transmitting terminal, T-MMB is professional to isolate high priority code stream and low priority code stream through TS stream separator, two kinds of code streams are group code stream through interweaving after separately condition access control, energy dissipation, the chnnel coding respectively, shine upon according to the hierarchical modulation information among the FIC then, and then launch by differential modulation, OFDM modulation, D/A conversion, front end to antenna.

At receiving terminal, tuner stage mainly is the snap information in work organization district and subchannel tissue district according to the information of decoding among the FIC, filters out all parameters of hierarchical modulation, according to the hierarchical modulation information that obtains each subchannel that goes to decode.If received signal is relatively good, just decode high priority code stream and low priority code stream are sent into source decoder then; If poor signal, the high priority code stream of just only decoding is sent into source decoder then.

Wherein, the high priority code stream advances different subchannels with the low priority code stream, and different subchannel identifiers (SubChId) is arranged.

According to above-mentioned method, the T-MMB traffic sub channel structure that is used for indicating whether carrying out hierarchical modulation and hierarchical modulation parameter is included in FIG (fast information group) data area of the FIB (FIB) that constitutes FIC.

According to above-mentioned method, whether carry out hierarchical modulation, with the indication of modulation type (ModuType) field, originally 11 for reserving in the FIG0/15 of T-MMB system, and present 11 are used to refer in the T-MMB system and adopt hierarchical modulation technology.

According to above-mentioned method, the hierarchical modulation parameter can increase the FIG data area newly and represent.Its method for designing is: first byte of data area (data field) of newly-increased FIG is of the same type 0, and the zone of certain expansion thereafter is own to be defined; The data area is selected at least one of group that FIG type 0 expansion 15,0 expansion 30 of FIG type, 0 expansion 7 of FIG type, 0 expansion 12 of FIG type, 0 expansion 20 of FIG type, 0 expansion 23 of FIG type, 0 expansion 29 of FIG type, FIG type 3, FIG type 4 form; Use FIG type 0 expansion 23-FIG0/23 at present.

According to above-mentioned method, the hierarchical modulation parameter is indicated with HPSubChId field, LP SubChId field, ModuType field, β value field in 0 expansion 23 of FIG type.Wherein HP SubChId field is indicated the subchannel at high priority code stream place; The subchannel at LPSubChId field indication low priority code stream place.The used modulation system of ModuType field indication hierarchical modulation; The used modulation factor of β value field indication hierarchical modulation.

According to above-mentioned method, the ModuType field is indicated modulation system used when using hierarchical modulation technology in the T-MMB system in 0 expansion 23 of FIG type, specifically is meant 16DAPSK/32DAPSK/64DAPSK.Wherein the high priority code stream is expressed as quadrant on planisphere, represents with 2 bits.

According to above-mentioned method, if carry out hierarchical modulation with the indication of hierarchical modulation indicator field in 0 expansion 15 of FIG type, then in the HP SubChId field of FIG type 0 expansion 23, insert the SubChId of high priority subchannel, in LP SubChId field, insert the SubChId of low priority subchannel.

According to above-mentioned method, increase by one of TS stream separator, each 1 of newly-increased 16APSK, 32APSK, 64APSK symbol mapper.Newly-increased 16APSK symbol mapper is different with original 16APSK symbol mapper in the T-MMB system, distance adjacent 2 in adjacent 2 distance of newly-increased 16APSK adjacent quadrant on planisphere and the same quadrant not necessarily equates, and is definite by modulation factor.Distance adjacent 2 in adjacent 2 distance of newly-increased 32APSK, 64APSK adjacent quadrant on planisphere and the same quadrant also not necessarily equates, and is definite by modulation factor.

The present invention adopts hierarchical modulation technology to the business of T-MMB system, makes the user can receive the code stream of high priority and low priority when signal is good, receives only the code stream of high priority during poor signal, has increased the flexibility of networking.

Description of drawings

Fig. 1 is the emission block diagram of T-MMB system

Fig. 2 is T-MMB system service channel flow figure

Fig. 3 is the method flow diagram that uses multiple modulation system in the T-MMB system

When pattern I, use 4 inputs of each multiplexer among Fig. 3; When pattern IV, only use 2 inputs of each multiplexer.

Fig. 4 is system's emission block diagram of the applying hierarchical modulation technology in the T-MMB system

Fig. 5 is the method flow diagram that adopts multiple modulation system in the T-MMB system behind the use hierarchical modulation technology

When pattern I, use 4 inputs of each multiplexer among Fig. 5; When pattern IV, only using 2 inputs of each multiplexer. the subscript * during sign map represents to adopt the mapping mode of hierarchical modulation

Fig. 6 is the structure chart of T-MMB traffic sub channel

The implication of each sign is as follows among Fig. 6:

Sub-channel: subchannel;

Sub-ChId: subchannel identifier;

Start Address: start address;

ModuType: modulation type;

CodingType: chnnel coding type;

Rfu: be left in the future and use;

Sub-channel field: subchannel zone

-PL: protection class;

-Sub-channel Size: sub-channel size.

Fig. 7 is the structure chart of the hierarchical modulation parameter of the applying hierarchical modulation technology in the T-MMB system.

The implication of each sign is as follows among Fig. 7:

Sub-channel: subchannel;

HP Sub-ChId: high priority code stream subchannel identifier in the hierarchical modulation;

LP Sub-ChId: low priority code stream subchannel identifier in the hierarchical modulation;

β value: the modulation factor of hierarchical modulation;

ModuType: the modulation type of hierarchical modulation.

Fig. 8 is the planisphere of the 16APSK in the T-MMB system

Fig. 9 is the planisphere of the 16APSK of the applying hierarchical modulation technology in the T-MMB system

Figure 10 is the planisphere of the 32APSK of the applying hierarchical modulation technology in the T-MMB system, and wherein amplitude is 4 kinds

Figure 11 is the planisphere of the 32APSK of the applying hierarchical modulation technology in the T-MMB system, and amplitude is 2 kinds

Figure 12 is the planisphere of the 64APSK of the applying hierarchical modulation technology in the T-MMB system

Embodiment

Now, will describe preferred embodiment of the present invention in detail.

By the professional specific implementation method of hierarchical modulation technology emission/reception T-MMB service that adopts of T-MMB is explained as follows:

FIG 0/15 reserves in DAB, is used to refer to the subchannel information of new business in the T-MMB system, and its ModuType field is used to indicate modulator approach as shown in Figure 6, and its 11 field implication is reserved, and now is revised as 11 indication hierarchical modulation, and is specific as follows:

ModuType (modulation type): this 2 bit labeling is used to refer to modulation system, and is specific as follows:

b1???b0

0????0：DQPSK；

0????1：8DPSK；

1????0：16DAPSK；

11: adopt hierarchical modulation.

FIG 0/23 reserves in DAB, now is used to refer to the parameter information of applying hierarchical modulation in the T-MMB system, and is as shown in Figure 7, specific as follows:

HP SubChId (subchannel identifier): this 6 bit regions is encoded to signless binary number, is used to refer to the subchannel at certain high priority code stream place.

LP SubChId (subchannel identifier): this 6 bit regions is encoded to signless binary number, is used to refer to the subchannel at certain low priority code stream place.

ModuType (modulation type): this 2 bit labeling is used to refer to modulation system, and is specific as follows:

b1??b0

0 0:16DAPSK, as shown in Figure 9

0 1:32DAPSK is as Figure 10, shown in Figure 11

1 0:64DAPSK, as shown in figure 12

11: reserve

β value (modulation factor): this 2 bit regions is encoded to signless binary number, the spacing parameter of indication hierarchical modulation.As Fig. 9, Figure 10, Figure 11, shown in Figure 12, β=θ ₁/ θ ₂Size definition is as follows:

b1???b0

0????0：β＝1

0????1：β＝2

1????0：β＝4

11: reserve

At transmitting terminal, in T-MMB, adopt system block diagram such as Fig. 4, shown in Figure 5 of hierarchical modulation technology.T-MMB is professional to tell high priority code stream and low priority code stream through the TS separator, the high priority code stream is put into different subchannels with the low priority code stream, insert 11 expression hierarchical modulation in the ModuType of FIG0/15 field simultaneously, insert the identifier of high priority code stream and low priority code stream place subchannel then at FIG0/23, modulator approach (supposing to choose 16DAPSK), the layering factor (supposing to select 2) etc., again through after the respective coding separately and the coded message in the snap information passage enter the transmission frame multiplexer together, be mapped to θ shown in Figure 9 when shining upon subsequently ₁/ θ ₂=2 planisphere, wherein the high priority code stream is mapped as phase place, as shown in FIG. the 2nd, 3, low priority then is mapped as the 1st, 4 shown in the figure, because the distance of adjacent two points of adjacent two quadrants widens, just effectively reduced the probability of high priority code stream like this in the receiving terminal erroneous judgement.Launch by antenna through differential modulation, OFDM modulation back at last.

At receiving terminal, tuner stage is according to decoding snap information (FIC), mainly is that the snap information FIG type 0 in work organization district and subchannel tissue district is expanded in 15 and indicated whether to carry out hierarchical modulation with the ModuType field.If carry out hierarchical modulation, then in 0 expansion 23 of FIG type, find out the subchannel that HP SubChId field and LP SubChId field are identified, extract the used modulation system of ModuType field indication hierarchical modulation then; The used modulation factor of β value field indication hierarchical modulation carries out differential decoding according to above-mentioned parameter then.If the signal that receives is relatively good, just decode high priority code stream and low priority code stream are sent into source decoder decodes then; If the poor signal that receives, the high priority code stream of just only decoding is sent into source decoder decodes then.

In the T-MMB system, adopt 16APSK sign map such as Fig. 9 of hierarchical modulation technology.

To each OFDM symbol, the vector (p of 4K-bit _{L, n}) _N=0 ^4K-1(p wherein _{L, n}Referring to ETSI EN 300401[1] the 14.4.2 joint) need be mapped to K 16APSK symbol in the following manner:

$q_{l,m}{=A_{l,m}e}^{j{\mathrm{\Φ}}_{l,m}},m=\mathrm{0,1,2},...,K-1$

Wherein K is a sub-carrier number, Φ _{L, m}As shown in table 1:

Table 1 16APSK phase mapping

??Φ l，m??β＝1	??Φ l，m??β＝2	??Φ l，m??β＝4	??p l，4m+1?p l，4m+2?p l，4m+3
				??π/8	??π/6	??π2/10	??0?0?0
??π3/8	??π2/6	??π3/10	??0?0?1
				??π5/8	??π4/6	??π7/10	??0?1?1
??π7/8	??π5/6	??π8/10	??0?1?0
				??π9/8	??π7/6	??π12/10	??1?1?0
??π11/8	??π8/6	??π13/10	??1?1?1
				??π13/8	??π10/6	??π17/10	??1?0?1
??π15/8	??π11/6	??π18/10	??1?0?0

Wherein the 32APSK sign map of hierarchical modulation such as Figure 10, Figure 11, Figure 10 is that amplitude is four kinds a planisphere, Figure 11 is that amplitude is two kinds a planisphere.

See Figure 10 earlier:

To each OFDM symbol, the vector (p of 5K-bit _{L, n}) _N=0 ^5K-1(p wherein _{L, n}Referring to ETSI EN 300401[1] the 14.4.2 joint) need be mapped to K 32APSK symbol in the following manner:

$q_{l,m}{=A_{l,m}e}^{j{\mathrm{\Φ}}_{l,m}},m=\mathrm{0,1,2},...,K-1$

Wherein K is a sub-carrier number, Φ _{L, m}As shown in table 2, A _{L, m}As shown in table 3:

Table 2 32APSK phase mapping

??Φ l，m??β＝1	??Φ l，m??β＝2	??Φ l，m??β＝4	??p l，5m+2?p l，5m+3?p l，5m+4
				??π/8	??π/6	??π2/10	??0?0?0
??π3/8	??π2/6	??π3/10	??0?0?1
				??π5/8	??π4/6	??π7/10	??0?1?1

??Φ l，m??β＝1	??Φ l，m??β＝2	??Φ l，m??β＝4	??p l，5m+2?p l，5m+3?p l，5m+4
				??π7/8	??π5/6	??π8/10	??0?1?0
??π9/8	??π7/6	??π12/10	??1?1?0
				??π11/8	??π8/6	??π13/10	??1?1?1
??π13/8	??π10/6	??π17/10	??1?0?1
				??π15/8	??π11/6	??π18/10	??1?0?0

The mapping of table 3 amplitude

??A l，m	??p l，5m?p l，5m+1
		??1	??0?0
??α	??0?1
		??α 2	??1?1
??α 3	??1?0

See Figure 11 again:

To each OFDM symbol, the vector (p of 5K-bit _{L, n}) _N=0 ^5K-1(p wherein _{L, n}Referring to ETSI EN 300401[1] the 14.4.2 joint) need be mapped to K 32APSK symbol in the following manner:

$q_{l,m}{=A_{l,m}e}^{j{\mathrm{\Φ}}_{l,m}},m=\mathrm{0,1,2},...,K-1$

Wherein K is a sub-carrier number, Ф _{L, m}As shown in table 4:

Table 4 32APSK phase mapping

??Φ l，m??β＝1	??Φ l，m??β＝2	??Φ l，m??β＝4	??p l，5m+1?p l，5m+2?p l，5m+3?p l，5m+4
				??π/16	??π/10	??π2/14	??0?0?0?0
??π3/16	??π2/10	??π3/14	??0?0?0?1

??Φ l，m??β＝1	??Φ l，m??β＝2	??Φ l，m??β＝4	??p l，5m+1?p l，5m+2?p l，5m+3?p l，5m+4
				??π5/16	??π3/10	??π4/14	??0?0?1?1
??π7/16	??π4/10	??π5/14	??0?0?1?0
				??π9/16	??π6/10	??π9/14	??0?1?1?0
??π11/16	??π7/10	??π10/14	??0?1?1?1
				??π13/16	??π8/10	??π11/14	??0?1?0?1
??π15/16	??π9/10	??π12/14	??0?1?0?0
				??π17/16	??π11/10	??π16/14	??1?1?0?0
??π19/16	??π12/10	??π17/14	??1?1?0?1
				??π21/16	??π13/10	??π18/14	??1?1?1?1
??π23/16	??π14/10	??π19/14	??1?1?1?0
				??π25/16	??π16/10	??π23/14	??1?0?1?0
??π27/16	??π17/10	??π24/14	??1?0?1?1
				??π29/16	??π18/10	??π25/14	??1?0?0?1
??α 3	??π19/10	??π26/14	??1?0?0?0

The 64APSK sign map of hierarchical modulation as shown in figure 12.

To each OFDM symbol, the vector (p of 6K-bit _{L, n}) _N=0 ^6K-1Be mapped to K 64APSK symbol in the following manner:

$q_{l,m}{=A_{l,m}e}^{j{\mathrm{\Φ}}_{l,m}},m=\mathrm{0,1,2},...,K-1$

Wherein K is a sub-carrier number, Φ _{L, m}As shown in table 5, A _{L, m}As shown in table 6.

Table 5 64APSK phase mapping

??Φ l，m??β＝1	??Φ l，m??β＝2	??Φ l，m??β＝4	??p l，6m+2?p l，6m+3?p l，6m+4?p l，6m+5
				??π/16	??π/10	??π2/14	??0?0?0?0
??π3/16	??π2/10	??π3/14	??0?0?0?1
				??π5/16	??π3/10	??π4/14	??0?0?1?1
??π7/16	??π4/10	??π5/14	??0?0?1?0
				??π9/16	??π6/10	??π9/14	??0?1?1?0
??π11/16	??π7/10	??π10/14	??0?1?1?1
				??π13/16	??π8/10	??π11/14	??0?1?0?1
??π15/16	??π9/10	??π12/14	??0?1?0?0
				??π17/16	??π11/10	??π16/14	??1?1?0?0
??π19/16	??π12/10	??π17/14	??1?1?0?1
				??π21/16	??π13/10	??π18/14	??1?1?1?1
??π23/16	??π14/10	??π19/14	??1?1?1?0
				??π25/16	??π16/10	??π23/14	??1?0?1?0
??π27/16	??π17/10	??π24/14	??1?0?1?1
				??π29/16	??π18/10	??π25/14	??1?0?0?1
??α 3	??π19/10	??π26/14	??1?0?0?0

The mapping of table 6 amplitude

??A l，m	??p l，6m?p l，6m+1
		??1	??0?0

??A l，m	??p l，6m?p l，6m+1
		??α	??0?1
??α 2	??1?1
		??α 3	??1?0

2. in the T-MMB system, adopt the frequency interlacing of hierarchical modulation technology

Frequency interlacing is that the 16APSK/32APSK/64APSK symbol is carried out the constellation point mapping according to specific order, and different transmission modes has different interlacing rules, and formula is as follows:

y _{L, k}=q _{L, n}, l=2,3,4 ..., L and k=F (n).

Specifically see ETSI EN 300 401.

3. in the T-MMB system, adopt the differential modulation of hierarchical modulation technology

Generate the PRS signal by the phase reference symbol maker,, provide fixed phase for follow-up OFDM symbol carries out differential modulation as second OFDM symbol of transmission frame.

16DAPSK is the differential amplitude modulation scheme that combines with phase place, and its amplitude and phase place are independently carried out differential modulation respectively.Its amplitude is modulated by 2DASK, and phase place is modulated by 8DPSK.

Differential modulation is carried out on same subcarrier of two adjacent OFDM symbols, is undertaken by following formula:

$z_{l-1,k}=R_L\·{\mathrm{\α}}^{p_{l-\mathrm{1,4}k}^{\′}}\·e^{j{\mathrm{\Φ}}_{l-1,k}^{\′}}$

$y_{l,k}={\mathrm{\α}}^{p_{l,4k}^{\′}}\·e^{j{\mathrm{\Φ}}_{l,k}^{\′}}$

$z_{l,k}=R_L\&CenterDot;{\mathrm{\&alpha;}}^{(p_{l-\mathrm{1,4}k}^{\&prime;}+p_{l,4k}^{\&prime;}{)}^{\mathrm{<figure-callout\; id="2"\; label="mod"\; filenames="H2009102223198E0000012.png,H2009102223198E0000041.png"\; state="\{\{state\}\}">mod</figure-callout>}2}}\&CenterDot;e^{j({\mathrm{\&Phi;}}_{l-1,k}^{\&prime;}+{\mathrm{\&Phi;}}_{l,k}^{\&prime;})},$ l＝2，3，4，...，L，

-K/2≤k≤K/2

R wherein _LThe interior ring amplitude of expression 16DAPSK; P ' _L-1,4k, p ' _{L, 4k}Bit behind the expression frequency-domain-interleaving; Φ ' _{L-1, k}, Φ ' _{L, k}Phase information behind the expression frequency-domain-interleaving.

32DAPSK is the differential amplitude modulation scheme that combines with phase place, and its amplitude and phase place are independently carried out differential modulation respectively.As Figure 10, shown in Figure 11, be divided into two kinds of modulator approaches, a kind of is that amplitude is modulated by 4DASK, phase place is modulated by 8DPSK; Another kind is that amplitude is modulated by 2DASK, and phase place is modulated by 16DPSK.

First talk about first kind:

Differential modulation is carried out on same subcarrier of two adjacent OFDM symbols, is undertaken by following formula:

$z_{l-1,k}=R_L\&CenterDot;A_{l-1,k}^{\&prime;}\&CenterDot;e^{j{\mathrm{\&Phi;}}_{l-1,k}^{\&prime;}}$

$y_{l,k}=A_{l,k}^{\&prime;}\&CenterDot;e^{j{\mathrm{\&Phi;}}_{l,k}^{\&prime;}}$

$z_{l,k}=R_L\&CenterDot;A_{l,k}^{\&prime;}\&CenterDot;e^{j({\mathrm{\&Phi;}}_{l-1,k}^{\&prime;}+{\mathrm{\&Phi;}}_{l,k}^{\&prime;})},$ l＝2，3，4，...，L，

-K/2≤k?≤K/2

R wherein _LThe interior ring amplitude of expression 32DAPSK; Φ ' _{L-1, k}, Φ ' _{L, k}Phase information behind the expression frequency-domain-interleaving; A ' _{L, k}As shown in table 7:

The mapping of table 7 amplitude

A′ l-l，k	A′ l，kp′ l-1，5k?p′ l，5k＝00	??A′ l，kp′ l-1，5k?p′ l，5k＝01	??A′ l，kp′ l-1，5k?p′ l，5k＝11	??A′ l，kp′ l-1，5k?p′ l，5k＝10
					1	1	??α	??α 2	??α 3
α	α	??α 2	??α 3	??1
					α 2	α 2	??α 3	??1	??α
α 3	α 3	??1	??α	??α 2

P ' _L-1,5k, p ' _{L, 5k}Bit behind the expression frequency-domain-interleaving;

Besides another kind of:

Differential modulation is carried out on same subcarrier of two adjacent OFDM symbols, is undertaken by following formula:

$z_{l-1,k}=R_L\&CenterDot;{\mathrm{\&alpha;}}^{p_{l-\mathrm{1,5}k}^{\&prime;}}\&CenterDot;e^{j{\mathrm{\&Phi;}}_{l-1,k}^{\&prime;}}$

$y_{l,k}={\mathrm{\&alpha;}}^{p_{l,5k}^{\&prime;}}\&CenterDot;e^{j{\mathrm{\&Phi;}}_{l,k}^{\&prime;}}$

$z_{l,k}=R_L\&CenterDot;{\mathrm{\&alpha;}}^{(p_{l-\mathrm{1,5}k}^{\&prime;}+p_{l,5k}^{\&prime;})\mathrm{<figure-callout\; id="2"\; label="mod"\; filenames="H2009102223198E0000012.png,H2009102223198E0000041.png"\; state="\{\{state\}\}">mod</figure-callout>}2}\&CenterDot;e^{j({\mathrm{\&Phi;}}_{l-1,k}^{\&prime;}+{\mathrm{\&Phi;}}_{l,k}^{\&prime;})},$ l＝2，3，4，...，L，

-K/2≤k≤K/2

R wherein _LThe interior ring amplitude of expression 32DAPSK; P ' _L-1,5k, p ' _{L, 5k}Bit behind the expression frequency-domain-interleaving; Φ ' _{L-1, k}, Φ ' _{L, k}Phase information behind the expression frequency-domain-interleaving.

64DAPSK also is the differential amplitude modulation scheme that combines with phase place, and its amplitude and phase place are independently carried out differential modulation respectively.Its amplitude is modulated by 4DASK, and phase place is modulated by 16DPSK.

Differential modulation is carried out on same subcarrier of two adjacent OFDM symbols, is undertaken by following formula:

$z_{l-1,k}=R_L\&CenterDot;A_{l-1,k}^{\&prime;}\&CenterDot;e^{j{\mathrm{\&Phi;}}_{l-1,k}^{\&prime;}}$

$y_{l,k}=A_{l,k}^{\&prime;}\&CenterDot;e^{j{\mathrm{\&Phi;}}_{l,k}^{\&prime;}}$

$z_{l,k}=R_L\&CenterDot;A_{l,k}^{\&prime;}\&CenterDot;e^{j({\mathrm{\&Phi;}}_{l-1,k}^{\&prime;}+{\mathrm{\&Phi;}}_{l,k}^{\&prime;})},$ l＝2，3，4，...，L，

-K/2≤k≤K/2

R wherein _LThe interior ring amplitude of expression 64DAPSK; Φ ' _{L-1, k}, Φ ' _{L, k}Phase information behind the expression frequency-domain-interleaving; A ' _{L, k}As shown in table 8:

The mapping of table 8 amplitude

??A′ l-l，k	A′ l，kp′ l-1，6k?p′ l，6k＝00	A′ l，kp′ l-1，6k?p′ l，6k＝01	A′ l，kp′ l-1，6k?p′ l，6k＝11	A′ l，kp′ l-1，6k?p′ l，6k＝10
					??1	??1	??α	??α 2	??α 3
??α	??α	??α 2	??α 3	??1
					??α 2	??α 2	??α 3	??1	??α
??α 3	??α 3	??1	??α	??α 2

P ' _L-1,6k, p ' _{L, 6k}Bit behind the expression frequency-domain-interleaving.

The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention, all any modifications of being made within the spirit and principles in the present invention, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (6)

1. a hierarchical modulating method is used for transmitting terminal, comprising:

T-MMB is professional to isolate high priority code stream and low priority code stream through TS stream, two kinds of code streams are group code stream through interweaving after separately condition access control, energy dissipation, the chnnel coding respectively, shine upon according to the hierarchical modulation information among the fast information channel in dab receiver FIC then, and then launch by differential modulation, OFDM modulation, D/A conversion, front end to antenna.

2. a hierarchical modulating method is used for receiving terminal, comprising:

According to the work organization district among the decoding fast information channel in dab receiver FIC and the snap information in subchannel tissue district, filter out hierarchical modulation information, according to each subchannel of hierarchical modulation information decoding that obtains; If received signal is better, decoding high priority code stream and low priority code stream are sent into source decoder then altogether; If received signal is bad, the high priority code stream of only decoding is sent into source decoder then.

3. method as claimed in claim 1 or 2 is characterized in that: first byte of data area of newly-increased FIG is of the same type 0, and the zone of certain expansion thereafter is own to be defined; The data area is selected at least one of group that FIG type 0 expansion 15,0 expansion 30 of FIG type, 0 expansion 7 of FIG type, 0 expansion 12 of FIG type, 0 expansion 20 of FIG type, 0 expansion 23 of FIG type, 0 expansion 29 of FIG type, FIG type 3, FIG type 4 form.

4. as right 3 described methods, it is characterized in that: the hierarchical modulation parameter is indicated with HP SubChId field, LP SubChId field, ModuType field, β value field in 0 expansion 23 of FIG type; Wherein HP SubChId field is indicated the subchannel at high priority code stream place; The subchannel at LP SubChId field indication low priority code stream place; The used modulation system of ModuType field indication hierarchical modulation; The size of the modulation factor that β value field indication hierarchical modulation is used.

5. as right 4 described methods, it is characterized in that: the modulation system of ModuType field indication hierarchical modulation in 0 expansion 23 of FIG type; Wherein the high priority code stream is expressed as quadrant on planisphere, represents with 2 bits.

6. method as claimed in claim 4 is characterized in that: insert the SubChId of high priority subchannel in the HP SubChId field of FIG type 0 expansion 23, insert the SubChId of low priority subchannel in the LPSubChId field.

Images