CN101147374A - Methods and apparatus for transmitting layered and non-layered data via layered modulation - Google Patents
Methods and apparatus for transmitting layered and non-layered data via layered modulation Download PDFInfo
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Abstract
A media access control (MAC) layer controller can manage base layer data and enhancement layer data in a layered modulation system. The MAC layer controller can process both base layer data and enhancement layer data and map the encoded symbols to a layered modulation constellation when both are present. If data for one of the layers terminates, then the MAC layer controller can generate and supply predetermined stuffing data to the layer lacking additional data. The MAC layer controller can send a control signal to the physical layer hardware to cause the hardware to map the layered signals having the stuffing data to a modified signal constellation. The MAC controller can also generate an overhead message that indicates the occurrence of the stuffing data. The receiver can receive the overhead message and can use the information to configure the receiver for the layered modulation constellation or the modified signal constellation.
Description
The cross reference of related application
The application requires the U.S. Provisional Application No.60/660 that is entitled as " METHODS AND APPARATUS FORTRANSMITTING LAYERED AND NON-LAYERED DATA VIA LAYEREDMODULATION (being used for sending via hierarchical modulation the method and apparatus of layering and non-layered data) " of submission on March 10th, 2005,873, and the U.S. Provisional Application No.60/643 that is entitled as " A METHOD OFTRANSMITTING A SINGLE LAYER DATA WHEN THE RECEIVER IS IN ALAYERED MODULATION MODE (when receiver is in the hierarchical modulation pattern, sending the method for single layer data) " of submission on January 11st, 2005,264 priority.
Background of invention
Wireless communication system constantly makes every effort to increase data bandwidth so that information can be coupled to exchange rapidly between the equipment of this communication system.A part that has limited in the parameter of each equipment available data bandwidth comprises the spectral bandwidth of distributing to these equipment and the quality of channel that links these equipment.
Wireless communication system uses various technology to compensate various constraints for data bandwidth.There is a kind of wireless communication system can include multiple coding techniques in, and can selects a kind of coding techniques based on the data transfer rate that channel is supported.In this system, each communication equipment can come the negotiation data rate based on the ability of channel.This communication system may be favourable for many point-to-point links, but individual transmitter to a plurality of receivers just provide in the distributed broadcast system of basic identical data may be ideal so.
Wireless communication system can be included hierarchical modulation in, is also referred to as hierarchical modulation, and wherein a plurality of data flow are striden the data Layer hierarchy and sent simultaneously.These a plurality of data flow can comprise a basic unit, and it is the robust communications link that all can successfully receive under nearly all operation of receiver situation.These a plurality of data flow also can comprise an enhancement layer, and it is broadcasted being lower than, equaling or be higher than under the data transfer rate of base layer data rate.Compare with basic unit, the communication on enhancement layer may require the higher signal quality at the receiver place.Therefore, enhancement layer may be responsive more to the change in the channel quality.
Receiver is guaranteed to have the ability in basic unit's communication usually, but and the data in the common demodulation basic unit.Support under the channel conditions of enhancement layer that receiver can also demodulation be modulated at additional data on the enhancement layer higher service quality to be provided or additional data bandwidth is provided being enough to.
Make the complicated operationization of transmitter and receiver on the use certain degree of layered modulation signal.Some data flow may have incoherent information separately on basic unit and enhancement layer.Because the relative independentability that this is two-layer, wherein one deck---for example enhancement layer---may have been finished and send or do not have more information to send, and basic unit is also continuing to provide information.Transmitter may not possess with the required identical rate selection of the intermittent operation of supporting enhancement layer enable and the ability of inactive hierarchical modulation.Perhaps, being incorporated in the unrestricted ability selected between the operation of layering or non-layered is undesirable or infeasible because of hardware constraints, cost or the standard of setting up.
Each of layered modulation signal layer intermittently lacks information and causes potential problem at the transmitter and receiver place.It is not the ability that can work when all information being arranged that transmitter need have on all layers of layered modulation signal.In addition, when receiver needs to perceive that all layers of layered modulation signal are not the information of all carrying.But any possible scheme should excessively not increase the weight of the burden of transmitter or processor processing ability.
Summary of the invention
A kind of media interviews controls (MAC) layer controller be base layer data and the enhancement data in the managing hierarchically modulating system independently.When base layer data and enhancement data all existed, this MAC layer controller can be handled these data.Base layer data and enhancement data are encoded and are mapped to a layered modulation constellation.
If wherein the data of one deck stop, interrupt, finish or stop, then this MAC layer controller can generate and provide predetermined padding data to lacking more multidata this layer.This MAC layer controller can send a control signal so that this physical layer hardware will have the hierarchical signal of padding data is mapped to once the signal constellation (in digital modulation) of revising to physical layer hardware.This MAC layer controller also can generate the overhead messaging of the generation of indication padding data.
Receiver can receive this overhead messaging, and can use this information to come at this layered modulation constellation or be somebody's turn to do through revising signal constellation (in digital modulation) be configured receiver.Receiver also can generate padding data to assist the decoding of enhancement data locally.
Each side of the present invention comprises a kind of method that sends layering and non-layered data in the hierarchical modulation channel.This method comprises the reception base layer data, base layer data is encoded into basic unit's code element, receive enhancement data, determine that enhancement data stops before base layer data stops, generate padding data, this padding data is appended to this enhancement data, and the enhancement data that will append padding data is encoded into the enhancement layer code element.
Each side of the present invention comprises a kind of method that sends layering and non-layered data in the hierarchical modulation channel.This method generates a hierarchical signal during being included in first time slot of the logic channel with a plurality of time slots, this hierarchical signal is mapped to a layered modulation constellation, during second time slot of this logic channel, generate a non-layered signal, and this hierarchical signal is mapped to a non-layered modulation constellation.
Each side of the present invention comprises that one is configured to send the transmitter of layering and non-layered data on the hierarchical modulation channel.This transmitter comprises: the base treatment piece, and it is configured to receive base layer data and this base layer data is encoded into some basic units code element; The enhancement layer processing block, it is configured to receive enhancement data and this enhancement data is encoded into some enhancement layer code elements; Signal mapper is coupled to this base treatment piece and enhancement layer processing block, and is configured to the combination of at least one basic unit's code element and at least one enhancement layer code element is mapped to a constellation point; And controller, it is configured to determine the termination of enhancement data, generates padding data in response to the termination of enhancement data, and this padding data is coupled to the enhancement data piece.
Each side of the present invention comprises a kind of transmitter that is configured to send layering and non-layered data on the hierarchical modulation channel.This transmitter comprises: the base treatment piece, and it is configured to receive base layer data and this base layer data is encoded into some basic units code element; The enhancement layer processing block, it is configured to receive enhancement data and this enhancement data is encoded into some enhancement layer code elements; Controller, it is configured to generate a control signal based on the existence of enhancement data; And signal mapper, be coupled to this base treatment piece and this enhancement layer processing block, and be configured to these basic unit's code elements and enhancement layer symbol mapped to a constellation of selecting in the middle of a plurality of constellations based on this control signal.
Each side of the present invention comprises a kind of receiver that is configured to receive layering and non-layered data on the hierarchical modulation channel.This receiver comprises: symbol de-interleaver, and it is configured to receive by the tone of constellation point modulation and from this tone and generates a basic unit's code element and an enhancement layer code element, and further is configured to generate a decoder control signal; The base treatment device is coupled to this symbol de-interleaver, and is configured to receive this basic unit's code element and the base layer data of decoding; And the enhancement layer processor, be coupled to this symbol de-interleaver, and be configured to receive this enhancement layer code element and based on this decoder control signal decoding enhancement layer data optionally.
Summary of drawings
Understand the detailed description of following elaboration in conjunction with the accompanying drawings, it is more apparent that the feature of each embodiment of the present disclosure, purpose and advantage will become, and similar in the accompanying drawings key element is marked with identical reference number.
Fig. 1 is the functional block diagram of an embodiment of including the wireless communication system of hierarchical modulation in.
Fig. 2 A is a kind of planisphere of hierarchical modulation to 2C.
Fig. 3 is the simplification functional block diagram of an embodiment of the transmitter in the hierarchical modulation system.
Fig. 4 is the simplification functional block diagram of an embodiment of MAC layer controller.
Fig. 5 is the functional block diagram that is arranged to an embodiment of the receiver of working in a hierarchical modulation system.
Fig. 6 be a hierarchical modulation system logic channel banish the simplification functional block diagram of putting.
Fig. 7 is a kind of simplified flow chart that generates the method for layering and non-layered data in hierarchical modulation system.
Fig. 8 is a kind of simplified flow chart that generates the method for layering and non-layered data in hierarchical modulation system.
Fig. 9 is the simplification functional block diagram of an embodiment of the transmitter in the hierarchical modulation system.
Invention specifies
Described and be used for making layering and non-layered data to be used for sending and receiving on the channel of hierarchical modulation in configuration System, method and apparatus. Logic channel in the wireless communication system can be configured to support hierarchical modulation. This branch Layer modulation can have a plurality of layers. When having defined two layers, ground floor can be configured to basic unit, and the second layer can quilt Be configured to enhancement layer.
Basic unit and enhancement layer can be configured to work substantially independently. The basic number that refers to that independently this carries on two-layer According to independence. Support each communication layers of upper strata and the Physical layer of these two modulating layers can have one or more. But basic unit and enhancement layer are independently substantially, do not carry because the information of carrying on layer relies on another layer The information of confession.
In another embodiment, logic channel can time-multiplexed a plurality of independently hierarchical modulation streams. Each stream can Do not rely on other any stream, and one or more streams of distributing to this logic channel can stop to generate hierarchy number According to, and other stream still continues to generate individual-layer data.
When data source stops to provide individual-layer data to a logic channel for hierarchical modulation configuration, media interviews Control (MAC) layer controller can determine to exist the non-layered data. This MAC layer controller can be configured to Such as filling bit, fill code element, fill grouping, the padding datas such as infilled frame or its certain combination are inserted into data In the stream with emulation, simulation or otherwise generate artificially an individual-layer data source. This MAC layer controller can For example insert a predetermined bit sequences to the disappearance layer. This predetermined bit sequences can be the circulation bit sequence, at random or PRBS pseudo-random bit sequence, or the information that provides on another layer is provided. Generating based on the data from existing layer Among the embodiment of padding data, basic unit and enhancement data no longer are essentially independent. But padding data is not taken Be with source information, but can be used to facilitate the ability in receiver place decoding base layer data.
In one embodiment, this MAC layer controller can be configured to control the signal map in the physical layer hardware Module. This physical layer hardware in the emitter can be configured to support a plurality of signal constellation (in digital modulation)s. This signal map module institute The mapping basic unit that uses and the constellation of enhancement data can be based in part on the control that is generated by this MAC layer controller Signal.
When basic unit and enhancement layer all provide data, this MAC layer controller can be controlled the signal map module will This data-mapping is to a layered modulation constellation. When data source stopped to provide data to enhancement layer, the MAC layer was to increasing Strong layer inserts padding data. This MAC layer controller also this signal map module of signaling will have the branch of padding data Layer data is mapped to second modulation constellation, and this second modulation constellation can be corresponding to also can not corresponding to a hierarchical modulation Constellation.
This MAC layer controller generates one to the existence of receiver indication padding data and this second modulation constellation Overhead messaging. Receiver can become to come receive data according to this overhead messaging with their decoder configurations Operate. These receivers can utilize the knowledge of padding data to assist to recover base layer data.
The functional block diagram of an embodiment of the wireless communication system 100 that Fig. 1 has included hierarchical modulation in---or being called hierarchical modulation---.This system comprises the one or more retaining elements that can communicate by letter with user terminal 110.User terminal 110 can be the radio telephone that for example is configured to use according to one or more communication standard operation of hierarchical modulation.For example, user terminal 110 can be configured to receive the radiophone signal from first communication network, and can be configured to receive data and information from the second communication network.In certain embodiments, these two communication networks all can be realized hierarchical modulation, and in other embodiments, one of them communication network can be realized the hierarchical coding modulation.
In one embodiment, base station 120a and 120b can be configured to send layered modulation signal to user terminal 110.For example, base station 120a and 120b can be configured to send the multicast signals that can be directed to user terminal 110 and other receiver (not shown).Layered modulation signal can comprise the base layer signal of sane configuration and work and thereby the enhancement layer signal more responsive to the variation in the channel under low link allowance.Enhancement layer can be configured to provide supplementary data to the data of supplying with in basic unit, or the independent data with low quality of service requirement is provided.
Although only show a broadcast transmitter 180 in wireless communication system 100, wireless communication system 100 can be configured to support a plurality of broadcast transmitters 180.A plurality of broadcast transmitters 180 can send signal in overlapping overlay area.User terminal 110 can receive the signal from a plurality of broadcast transmitters 180 concomitantly.These a plurality of broadcast transmitters 180 can be configured to broadcast identical, different or similar broadcast singal.For example, second broadcast transmitter of the covering area overlapping of the overlay area and first broadcast transmitter also can be broadcasted the partial information that first broadcast transmitter is broadcasted.
If enhancement layer does not carry the redundant data of data entrained in the basic unit, then this hierarchical modulated data configuration will be favourable.In addition, receiver can not cause loss of service by decoding enhancement layer.For example, basic unit can be configured to broadcast the video under the normal video resolution, and enhancement layer can provide the resolution of raising receiving video signals or the additional data of SNR.In another embodiment, basic unit can be configured to provide the signal with predetermined quality, and such as the vision signal under the 15 frame per seconds, and enhancement layer can be configured to replenish entrained information in the basic unit.For example, enhancement layer can be configured to carry the information that is used to support the vision signal under the 30 frame per seconds.In this configuration, can not cause the signal of low resolution, lower signal quality or SNR by decoding enhancement layer data, but can not cause losing fully of signal.
In another embodiment, user terminal 110 can be configured to decode substantially concomitantly basic unit and enhancement layer, and does not rely on base layer information when decoding enhancement layer.For example, user terminal 110 can be configured to determine single decoder threshold value, and uses this single decoder threshold value when decoding basic unit and enhancement layer.This decoder threshold value can be based in part on the characteristic of hierarchical modulated data.For example, this decoder threshold value can be based on power or the energy ratio of enhancement layer with basic unit.This decoder threshold value also can be based in part on the expectation error rate, such as symbol error rate, bit error rate (BER), packet error rate or FER (Floating Error Rate) etc.This decoder threshold value can be fixed, or can change based on the expectation that for example changes or the hierarchical modulated data characteristic of variation.
Fig. 2 A illustrates the planisphere of signal map module operable possibility constellation when shining upon basic unit and enhancement data to 2C.In one embodiment, this signal map module is selected a constellation based on the control input that is received from MAC layer controller.Fig. 2 A does not limit the type constitution of the constellation that can use in hierarchical modulation system to these planispheres shown in the 2C, but provides as the example of an embodiment of two-layer modulating system on the contrary.
Fig. 2 A is the planisphere 260 of an embodiment of particular hierarchical modulation realization.The planisphere 260 of Fig. 2 A comes down to a 16-QAM constellation, and wherein base layer data is mapped to this constellation one particular quadrant, and enhancement layer is mapped to the ad-hoc location in this constellation.16-QAM constellation 260 need not have consistent interval but can be modified to, and different intervals is arranged between the closest approach in different quadrants as one man at interval in each quadrant.In addition, some points in this constellation can be about the mid point mirror image symmetry of this quadrant.
The input of signal map piece comprises 2 bit (b from basic unit
1b
0) and from 2 bit (e of enhancement layer
1e
0).Base layer stream is launched to compare higher power level with enhancement layer stream, and energy is than the satisfied following relation of r:
By average constellation being put energy (=2 α
2+ 2 β
2) normalizing to 1, α and β utilisable energy than the formal representation of r are
A plurality of tones in the same logic channel of one ofdm system can use identical energy ratio, and wherein a logic channel can comprise the one or more tones from this OFDM sets of tones.But the energy ratio can change between logic channel.Therefore, the signal map piece can be mapped to various constellations than with identical data according to energy, and wherein constellation is according to the decision of energy ratio.Thus, an OFDM code element can comprise a plurality of physical channels.The tone of one particular physical channel with respect to same OFDM code element in the corresponding tone of another logic channel can have different energy ratios.
For example, a signal map piece can be configured to basic unit and enhancement data are mapped to one of two constellations, at this this two constellations corresponding to energy than 4 and 9.Notice that this layered modulation signal constellation is followed the Gray mapping, and the signal constellation (in digital modulation) that is used for hierarchical modulation equals to be equivalent to the signal constellation (in digital modulation) of 16-QAM at 4 o'clock than r at energy.
Fig. 2 B is another embodiment 270 of planisphere.The planisphere 270 of Fig. 2 B is corresponding to the QPSK constellation, and supports each code element 2 bit.Thus, when this 2 bit source from one deck the time, the planisphere 270 of Fig. 2 B is not supported hierarchical modulation.In one embodiment, the distance between these constellation point is adjustable to obtain energy than 1.
Fig. 2 C is another embodiment 280 of planisphere.The planisphere 280 of Fig. 2 C comprises 4 constellation point of the planisphere 260 that is selected from Fig. 2 A.These constellation point of planisphere 260 that are selected from Fig. 2 A are corresponding to maximized four constellation point of minimum range that make between any two adjacent constellation point.Certainly, can use other criterion to select other constellation point, or can in this system, use other certain planisphere.
Fig. 3 is the functional block diagram of an embodiment that is arranged to the transmitter 300 of a hierarchical modulation system.In one embodiment, transmitter 300 can be realized with the broadcast transmitter of Fig. 1 system.The transmitter 300 of Fig. 3 can be arranged to the OFDM (OFDMA) of use Fig. 2 B constellation or the hierarchical modulation in OFDM (OFDM) system.
Transmitter 300 can be configured to when base layer data and enhancement data all exist base layer data and enhancement data are mapped to the planisphere of Fig. 2 A.Transmitter 300 can be configured to select when enhancement layer stops or no longer is provided for transmitter 300 one to replace constellation, such as one of constellation of Fig. 2 B or 2C.
But that the transmitter 300 shown in Fig. 3 is represented is an embodiment, limits and disclosed apparatus and method are not constituted.For example, single-carrier system can be modulated with hierarchical modulated data, and corresponding decoder can be configured to the single carrier wave with hierarchical modulation is operated in the receiver.
Transmitter 300 can comprise similar substantially basic unit and enhancement layer processing block 310 and 320 respectively.Base treatment piece 310 can be configured to base layer data is processed into required modulation format, for example QPSK.Enhancement layer processing block 320 can be configured to enhancement data is processed into required modulation format, for example QPSK similarly.
Base treatment piece 310 and enhancement layer processing block 320 receive corresponding data from the source encoder (not shown), and this source encoder can be the broadcast media sources of Fig. 1.Enhancement layer processing block 320 also can be configured to receive padding datas from MAC layer controller 400 when the source encoder (not shown) stops to provide the enhancing data.
In one embodiment, base layer data and enhancement data can comprise certain combination of vision signal, audio signal or video and audio signal.Video/audio signal in the basic unit is corresponding to reproduce the required data of basic service quality at the receiver place.Video/audio signal in the enhancement layer is corresponding to generate the more required additional data of enhanced quality-of-service at the receiver place.Therefore, the user of two layers (basic unit and enhancement layer) of can decoding can enjoy the video/audio signal of abundant enhancing quality to the full, and the user of the basic unit of can decoding can obtain the video/audio signal of minimum quality.
Inner separately at base treatment piece 310 and enhancement layer processing block 320, data are coupled to Reed Solomon encoder 301 or 311 to carry out block encoding.Reed Solomon encoder 301 and 311 output are coupled to corresponding turbo encoder 303 and 313.Turbo encoder 303 and 313 can be configured to come data are carried out the turbo coding according to the predictive encoding rate.This encoding rate can be fixed, and maybe can select from a plurality of encoder rate.For example, turbo encoder 303 and 313 can be configured to provide 1/3,1/2 or 2/3 encoding rate independently.
Turbo encoder 303 and 313 output are coupled to corresponding bit interleaver 305 and 315 to improve anti-burst error ability.Bit interleaver 305 and 315 output are coupled to corresponding time slot allocation module 307 and 317.Time slot allocation module 307 and 317 can be configured to make code symbols and predetermined time slot---such as be the time slot that interweaves in time division multiplex system---time unifying.Time slot allocation module 307 and 317 output are coupled to corresponding scrambler 309 and 319.Encode basic unit and enhancement layer code element have been represented in scrambler 309 and 319 output.
Code element from these two layers is combined at signal mapper 330 places.Signal mapper 330 can be configured to basic unit and enhancement layer symbol mapped in the constellation specified point to carry out hierarchical modulation.For example, signal mapper 330 can be configured to one or more basic units code element together with a single point of one or more enhancement layer symbol mapped in the layered modulation constellation.Signal mapper 330 can be configured to each logic channel is mapped to a constellation with predetermined power ratio.But different logic channels can be mapped to the constellation with different-energy ratio.
The output of signal mapper 330 is coupled to time-interleaved device 340, and this time-interleaved device 340 is configured to interweave a particular time-slot in a logic channel of institute's mapped constellation points.As previously mentioned, this system can realize the time division multiplexing configuration, and is time-multiplexed with a plurality of other hierarchical modulation streams on the same logic channel at this single hierarchical modulation stream.The set of signal flow can be by time-interleaved, or use such as scheduled time multiplexing algorithms such as circulation (round robin) distribution by time-multiplexed.
The output of time-interleaved device 340 is coupled to sub-carrier allocation module 350.This sub-carrier allocation module can be configured to give every group of time-interleaved logic channel with one or more tones, frequency or sub-carrier allocation from an OFDM tone sets.Distribute to the scope of the subsets of subcarriers of one group of time-interleaved logic channel can be from a channel to a plurality of subcarriers until all available subcarriers.Sub-carrier allocation module 350 can be mapped to a subsets of subcarriers according to a pre-defined algorithm one group of logic channel that serial is time-interleaved.This pre-defined algorithm can be configured to distribute these logic channels in the persistence mode, maybe can be configured to come assigning sub-carriers according to hop algorithm.
The output of sub-carrier allocation module 350 is coupled to OFDM code element module 360, and this OFDM code element module 360 is configured to come modulating subcarrier based on the hierarchical modulation code element of being distributed.Modulated OFDM subcarrier from OFDM code element module 360 is coupled to IFFT module 370, and this IFFT module 370 can be configured to generate an OFDM code element and at the rear portion or the Cyclic Prefix of anterior additional predetermined length.
OFDM code element from IFFT module 370 is coupled to dressing stick 380, this OFDM code element can be by shaping, slicing, window, or carry out other processing.The output of dressing stick 380 is coupled to transmitting RF processor 390 and launches to be transformed into the expectation working band.For example, the output of transmitting RF processor 390 can comprise or be coupled to an antenna (not shown) to carry out wireless transmission.
When the source encoder (not shown) when corresponding processing block 310 and 320 provides base layer data and enhancement data, MAC layer controller 400 control signal mappers 330 with basic unit's code element and enhancement layer symbol mapped to first constellation such as the planisphere of Fig. 2 A.When the source encoder (not shown) stopped or stopping providing the enhancing data, MAC layer controller determined the enhancement data disappearance.MAC layer controller 400 generates padding datas and provides this padding data to the input of enhancement layer processing block 320.MAC layer controller 400 randomly control signal mapper 330 base layer data and enhancement data with padding data are mapped to second constellation such as the constellation of Fig. 2 B or 2C.
Because enhancement layer processing block 320 comprises Reed Solomon encoder 311, bit interleaver 315 and scrambler 319, the order of enhancement layer code element is inconsistent with the order of the enhancement data of being imported probably.Thus, the constellation change of control signal mapper 330 that MAC layer controller 400 can be configured to be controlled at preset time, occasion, at interval or incident---such as once interweaving and after the Reed-Solomon piece of scrambler finishes---.
In another transmitter 300 embodiment, enhancement layer processing block 320 can omit bit interleaver 315 and scrambler 319.In this embodiment, the output of Reed-Solomon encoder 311 is coupled to turbo encoder 313, and can be assigned to a particular time-slot through the turbo coded data.In this embodiment, MAC layer controller 400 can be configured to the constellation of the approximately consistent moment control signal mapper 330 of padding data.
The receiver that receives the transmission of a part that only has Reed Solomon code block can use with the local regeneration of MAC layer controller 400 employed identical algorithms padding data and generate padding data.The local padding data that generates can be used for helping recovering the base layer data that received.Thus, receiver does not require the transmission of padding data, and does not need to handle and the corresponding received signal of padding data.
In one embodiment, MAC layer controller 400 can be configured to generate at random or the pseudorandom padding data.MAC layer controller 400 also can be configured to same constellation is used in layering and non-layered data.In this embodiment, receiver is not benefited from the use of padding data, the part of the enhancement data of Reed-Solomon coding unless this padding data can be used to assist to decode.
In another embodiment, MAC layer controller 400 can be configured to use the constellation of Fig. 2 B when generating padding data.In this embodiment, signal mapper 330 arrives the QPSK constellation point with basic unit's symbol mapped.Signal mapper 330 has been ignored padding data in fact.
In another embodiment, MAC layer controller 400 selects padding data to keep the constellation of Fig. 2 C based on base layer data.But this embodiment may need the significantly signal processing of increase, because need consider the effect of Reed Solomon encoder 313, bit interleaver 315 and scrambler 319 when generating padding data.
Fig. 4 is the simplification functional block diagram of an embodiment of the MAC layer controller 400 shown in the transmitter of Fig. 3.MAC layer controller 400 comprises the enhancing data detector 410 that is coupled to padding data maker 420, overhead messaging maker 430 and constellation controller 440.
Strengthen data detector 410 and can be configured to directly monitor that the enhancement layer source is to monitor the appearance of enhancement data.Alternatively or replenish ground, strengthening data detector 410 can be from receiving such as upper grade logic layer such as application layer or network layers to strengthening the control messages that data detector notice enhancement data is near completion or stops.
In case determine that enhancement data stops or disappearance, strengthen data detector 410 and promptly start padding data maker 420.Padding data maker 420 generates the predetermined filling data sequence, and this padding data is coupled to the input of enhancement layer processing block.The enhancement layer processing block need not this padding data of actual coding, because this data represented dummy data.But, make the enhancement layer processing block handle this padding data and can simplify the hardware realization.
Padding data maker 420 can generate for example predetermined sequence, such as complete 1, complete 0 or preassigned pattern.In another embodiment, padding data maker 420 can use such as predetermined maker algorithms such as multinomials and generate padding data.Padding data can be at random or pseudo random sequence.
Strengthen data detector 410 and also can start overhead messaging maker 430, this overhead messaging maker 430 is configured to generate the indication padding data and is comprised in interior overhead messaging.Because signal mapper is the actual coding padding data not, so overhead messaging is important for receiver receives data.
Strengthen also may command constellation controller 440 of data detector 410, this constellation controller 440 is configured to the employed signal constellation (in digital modulation) of control signal mapper.In certain embodiments, constellation controller 440 can be omitted, and layering and non-layered data are used same constellation.In other embodiments, hierarchical modulation is used first layered modulation constellation, and the non-layered data are used the second non-layered constellation.
Fig. 5 is the simplification functional block diagram of an embodiment of receiver 500.Receiver general execution and the complementary operation of transmitter operation.
Receiver 500 comprises reception RF processor, and this reception RF processor is configured to receive the OFDM code element of these transmitting RF, and they are handled and become baseband OFDM code element or frequency conversion to become basic their frequency conversions is baseband signal.If from the frequency shift (FS) of baseband signal is a remnant of signal bandwidth, if perhaps signal is sentenced permission this signal of direct processing and further frequency conversion at enough low intermediate frequency, then this signal can be called as the basic baseband signal that is.Be coupled to FFT module 520 from the OFDM code element that receives RF processor 510, this FFT module 520 is configured to these OFDM symbol transformations to these hierarchical modulation frequency domain subcarrier.
FFT module 520 can be configured to and will be coupled to channel estimator 530 such as predetermined one or more subcarriers such as pilot subcarrier.These pilot subcarriers can be for example equally spaced one or more groups OFDM subcarriers.Channel estimator 530 is configured to utilize these pilot subcarriers to estimate receiving influential each channel of OFDM code element.In one embodiment, channel estimator 530 can be configured to determine and the corresponding channel estimating of each subcarrier.The channel estimating at one certain subcarriers place can be used as for example channel estimating of the contiguous subcarriers such as those subcarriers in the predetermined coherence bandwidth of pilot subcarrier.
Subcarrier and these channel estimating from FFT module 520 are coupled to subcarrier symbol deinterleaver 540.The modulation that symbol de-interleaver 540 can be configured to reverse and be carried out by the sub-carrier allocation module of Fig. 3.Symbol de-interleaver 540 also can be configured to generate decoder control signal.Symbol de-interleaver 540 can generate this decoder control signal based on the existence of the notice padding data that is for example sent by transmitter and the overhead messaging of position.Symbol de-interleaver 540 can be coupled to this decoder control signal enhancement layer decoder with the enhancement layer decoder of optionally stopping using when this overhead messaging indication enhancement layer only comprises padding data.This decoder control signal also can be used for optionally generating padding data, and this padding data be appended to the enhancement layer code element that received or decoded enhancement data to assist the carrying out of decode procedure by enhancement layer decoder.For example, enhancement layer decoder can generate padding data, and can this padding data be appended to enhancement data to assist the carrying out of error correction and error detection at Reed Solomon decoder place.
Receiver 500 is configured to each OFDM subcarrier or tone are carried out base layer decoder and enhancement layer decoder.For clear and for simplicity, Fig. 5 shows a kind of single base layer decoder device and enhancement layer decoder.
This base layer decoder device and enhancement layer decoder can be operated substantially concurrently.Each decoder module can be configured to operation concomitantly on identical reception constellation point.Enhancement layer decoder can be independent of the operation of base layer decoder device thus basically, and does not rely on the result of base layer decoder device when decoding enhancement layer data.As long as enhancement layer decoder does not rely on the decoded result that obtains from the base layer decoder device, base layer decoder device and enhancement layer decoder just can be regarded as operating substantially independently, although shared some submodule of these decoders.Thus, but base layer decoder device and enhancement layer decoder shared channel estimate, and even can shared individual bit metric module, for example 550.Yet if enhancement layer decoder does not rely on the result of base layer decoder device when decoding enhancement layer data, these two decoders can be considered to be essentially independent.
These decoders shown in the embodiment of the receiver 500 of Fig. 5 are configured to decoding through the hierarchical modulated data of turbo coding.Certainly, if transmitter is configured to generate other coding of certain type, then the decoder in the receiver 500 will be complementary with this encoder type.For example, transmitter can be configured to use turbo coding, convolutional encoding, low-density checksum (LDPC) coding or other certain type of coding to come coded data.In this embodiment, receiver 500 disposes complementary decoder.Thus, base layer decoder device in the receiver 500 and enhancement layer decoder can be configured to provide the combination of turbo decoding, the convolution decoder such as the use Veterbi decoding, LDPC decoding or other certain decoder or these decoders separately.
Each hierarchical modulation tone is coupled to basic unit's bit metric module 550 and enhancement layer bit metric module 560.Bit metric module 550 and 560 can receive the tolerance of the quality of constellation point to determine indication to the operation of hierarchical modulation tone.
Among the embodiment that the code element of representing in constellation point is encoded by turbo, bit metric module 550 and 560 can be configured to determine the log-likelihood ratio (LLR) of the receiving symbol represented by constellation point.LLR is the logarithm of likelihood ratio.It is the probability that original bit equals 0 on 1 the likelihood ratio that this ratio can be defined as original bit.Perhaps, this ratio can define with opposite way, and wherein LLR is that original bit is the probability that original bit equals 1 on 0 the likelihood ratio.There is not essential difference between these two kinds of definition.Bit metric module 550 and 560 can utilize that for example constellation point amplitude and channel estimating are determined these LLR values.
Each bit metric module 550 and 560 utilizes channel estimating and received signal to determine the LLR value.Also can utilize Noise Estimation.But if used the turbo coding/decoding method no matter why Noise Estimation all provides identical result, then the Noise Estimation item can be ignored substantially.In this embodiment, bit metric module 550 and 560 hardware can use predetermined value as Noise Estimation when calculating the LLR value.
The output of base bit metric module 550 is coupled to base treatment device 570.The output of enhancement layer bit metric module 560 is coupled on function enhancement layer processor 580 basic and that base treatment device 570 is similarly worked.For example, the LLR value is coupled to corresponding basic unit or enhancement layer processor 570 and 580 from bit metric module 550 and 560.
Base treatment device 570 comprises descrambler 572, and this descrambler 572 is configured to operate the code element scrambler of carrying out in the encoder to be reversed in to receiving the LLR value.The output of code element descrambler 572 is coupled to the bit interleaver 574 that is configured to the code element deinterleaving that will before interweave.The output of bit deinterleaver 574 is coupled to turbo decoder 576, and this turbo decoder 576 is configured to will decode through the turbo symbols encoded according to the employed encoding rate of turbo encoder.For example, turbo decoder 576 can be configured to carrying out decoding through 1/3,1/2 or 2/3 speed turbo coded data.576 pairs of turbo encoders for example LLR value are operated.Decoding output from turbo decoder 576 is coupled to Reed Solomon decoder 578, and this ReedSolomon decoder 578 can be configured to be based in part on Reed Solomon coded-bit and recover basic unit's bit.Basic unit's bit of gained is sent to source decoder (not shown) as a result.
Enhancement layer processor 580 is operated similarly with base treatment device 570.Descrambler 582 receives the LLR value from strengthening bit metric module 560.Its output is coupled to bit deinterleaver 584 and turbo decoder 586.The output of turbo decoder 586 is coupled to Reed Solomon decoder 588.The enhancement layer bit of gained is sent to source decoder (not shown) as a result.
When using padding data, enhancement layer can not be sent out.In this embodiment, enhancement layer processor 580 idle runnings or be de-energized to preserve power.In another embodiment, no matter send signal and be hierarchical signal or can be used as the non-layered signal that the result of basic unit's pattern only generates, base treatment device 570 and enhancement layer processor 580 can continue decoded signal.Base treatment device 570 and enhancement layer processor 580 need not to have any knowledge about employed operator scheme of transmitter or planisphere.Receiver 500 can be configured to always suppose a layered modulation constellation.Decoded data can comprise the individual-layer data that has base data and strengthen data, perhaps can only comprise base data and can be abandoned by subsequent treatment level (not shown) from the decoded data of enhancement process device 580.
Fig. 6 is that the banising of logic channel of a hierarchical modulation system put 600 simplification functional block diagram.This is banishd and puts and can use in the system of for example Fig. 1.
Corresponding to basic constituent element and enhancing constituent element at least one data channel MAC protocol encapsulation is arranged respectively.The big I of stream packets is forced to equate in each encapsulation.Can use single field to carry the stream packets size of representing with the form of MAC layer grouping number.This field is applicable to that basic constituent element encapsulation and enhancing constituent element encapsulate the stream packets among both.
For the stream that is configured to " only basic unit ", there is not the enhancing constituent element that provides to network one side's data channel MAC layer by fluid layer.In this case, data channel MAC layer is created the virtual stream grouping that comprises the padding data that can be known mode, makes the basic constituent element of MAC layer encapsulation basic identical with the stream packets layout that strengthens constituent element thus.
Network one side, when paying the grouping of MAC layer to physical layer, MAC layer sign comprises those groupings and the indication physical layer of filling grouping and do not send padding data, or do not send most padding data.For the error control of the piece that is made of padding data fully, MAC layer indication physical layer does not send parity packets yet.
Fig. 7 is a kind of simplified flow chart that generates the method 700 of layering and non-layered data in hierarchical modulation system.Method 700 can be carried out by the transmitter of for example Fig. 3.
Transmitter proceeds to frame 730 and receives enhancement data.In certain embodiments, enhancement data is relevant with base layer data, and in other embodiments, base data and enhancement data are incoherent.Transmitter can for example receive enhancement data from source of media.Transmitter proceeds to frame 740 and encoding enhancement layer data.Transmitter can be before the base treatment shown in frame 710 and 720, carry out enhancement layer afterwards or with it concomitantly handles.
Transmitter proceeds to decision box 750 and determines only whether the basic mode formula enables.Only the basic mode formula may occur in the system for example one and uses and be configured to send high-priority data and this system and wish successfully to receive the possibility of these data when high.Alternatively or in addition, only the basic mode formula can be used as the result that enhancement data finishes, stops, stops or ending and takes place.In enhancement data and base layer data is uncorrelated and enhancement data when having been transmitted fully, enhancement data can stop or stop.
If transmitter determines that only the basic mode formula is not enabled, then transmitter is back to frame 710 to continue to handle two layer data from decision box 750.But if transmitter determines that only the basic mode formula is enabled, then transmitter proceeds to frame 760 from decision box 750.
At frame 760, transmitter generates padding data in response to basic mode formula only.This padding data can be the interior tentation data that is combined in that can comprise predetermined bit sequences, predetermined bit, pseudo-random bits, random bit or other certain bit sequence or bit sequence.
Transmitter proceeds to frame 770 and handles the path to enhancement layer and append or provide these filling bits.For example, transmitter can offer enhancement layer encoder with filling bit.Transmitter proceeds to frame 780 and encodes has the enhancement layer of padding data.
Fig. 8 is a kind of simplified flow chart that generates the method 800 of layering and non-layered data in hierarchical modulation system.Method 700 can be carried out by the transmitter of for example Fig. 3.
Transmitter proceeds to frame 840 and generates the non-layered modulation signal.For example, transmitter can generate only base layer signal in response to basic mode formula only.Transmitter proceeds to frame 850 and this non-layered modulation signal is mapped to a non-layered modulation constellation points.For example, transmitter can be configured to a non-layered modulation signal is mapped to a constellation point from the constellation of Fig. 2 B.
Transmitter proceeds to frame 860, and will from this minute layered modulation signal constellation point distribute to second time slot of the same logic channel that in first time slot, has hierarchical modulation.Transmitter proceeds to frame 870 and this logic channel is mapped to a physical channel to launch.For example, transmitter can be configured to this logic channel is mapped to one or more subcarriers of one or more OFDM code elements.
Fig. 9 is the simplification functional block diagram of an embodiment of the transmitter 900 in the hierarchical modulation system.Transmitter 900 comprises the device 910 that is used to receive base layer data of the device 960 that is coupled to the base layer data that is used to encode.
Transmitter 900 also comprises the device 920 that is used to receive enhancement data.This transmitter comprises and is used for determining the only device 930 of basic mode formula that this device 930 is coupled to the device 920 that is used to receive the device 910 of base layer data and is used to receive enhancement data.Be used for determining that only the device 930 of basic mode formula can monitor that each data flow maybe can receive and indicate the only control signal of basic mode formula.
The device 940 that is used to generate padding data is coupled to and is used for determining the only device 930 of basic mode formula, and can enable and generate padding data in response to basic mode formula only.Be used for the device 950 that padding data is appended to enhancement data is coupled to the device 940 that is used to receive the device 920 of enhancement data and is used to generate padding data.The device 950 that is used for padding data is appended to enhancement data appends padding data or replaces with padding data to enhancement data when only the basic mode formula is enabled and strengthens data.
The device 950 that is used for padding data is appended to enhancement data is coupled to the device 980 that is used for the encoding enhancement layer data.Be used for the combination that the device 980 of encoding enhancement layer data can come encoding enhancement layer data, padding data or enhancement data and padding data thus according to transmitter mode.
The device 970 that is used to shine upon coded data is coupled to the device 960 of the base layer data that is used to encode and is used for the device 980 of encoding enhancement layer data.The device 970 that is used to shine upon coded data can be configured to coded data is mapped to a signal constellation (in digital modulation) of selecting in the middle of a plurality of signal constellation (in digital modulation)s.This constellation can be based on the state of basic mode formula only---and promptly whether enable and select according to basic mode formula only.The device 970 that is used to shine upon coded data can be configured to select a basic unit's code element and a corresponding enhancement layer code element, and with selected these symbol mapped to a constellation point.In addition, the device 970 that is used to shine upon coded data can be configured to coded data or signal constellation point are mapped to a logic channel, and this logic channel is mapped to a physical channel.The device 990 that is used to send data is coupled to and is used to shine upon the device 970 of coded data to send mapped data.
Be illustrated at system, the method and apparatus of hierarchical modulation system transmission layering and non-layered data being used for.A kind of transmitter can seamlessly be handled layering or the non-layered data that are assigned to the stream that disposes the logic channel that is used for hierarchical modulation.
Various illustrative components, blocks, module and the circuit of describing in conjunction with these embodiment disclosed herein can be realized by the combination in any that general processor, digital signal processor (DSP), Reduced Instruction Set Computer (RISC) processor, application-specific integrated circuit (ASIC) (ASIC), field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components or its are designed to carry out function described herein or carry out.General processor can be a microprocessor, but alternatively, this processor can be random processor, controller, microcontroller or state machine.Processor also can be implemented as the combination of computing equipment, for example DSP and the combination of microprocessor, a plurality of microprocessor, one or more microprocessors of cooperating with the DSP core or any other this type of configuration.
Software module or the two combination enforcement that the step of method, process or the algorithm of describing in conjunction with these embodiment disclosed herein can directly use hardware, be carried out by processor.Order shown in various steps in method or the process or action can be pressed is carried out, and maybe can carry out by another order.In addition, one or more processes or method step be can omit, or can one or more processes or method step be added to these methods and process.The step that other adds, frame or action can be added on beginning, the ending of these methods and process or occupy between its existing key element.
The above explanation that disclosed embodiment is provided is in order to make any those of ordinary skill in this area all can make or use disclosed invention.The various modifications of these embodiment are easy to those of ordinary skills apparent, and defined herein vague generalization principle can be applied to other embodiment and can not depart from the spirit or scope of disclosed invention.Thus, disclosed invention is not intended to be defined to shown these embodiment herein, but should meet the scope of the broad sense consistent with principle disclosed herein and novel feature.
Claims (30)
1. method that in the hierarchical modulation channel, sends layering and non-layered data, described method comprises:
Receive base layer data;
Described base layer data is encoded into some basic units code element;
Receive enhancement data;
Determine that described enhancement data stopped before described base layer data stops;
Generate padding data;
Described padding data is appended to described enhancement data; And
The described enhancement data of appending described padding data is encoded into some enhancement layer code elements.
2. the method for claim 1 is characterized in that, further comprises:
Select at least one basic unit's code element;
Select at least one corresponding enhancement layer code element; And
With selected symbol mapped to a constellation point.
3. the method for claim 1 is characterized in that, further comprises:
Before described padding data, described basic unit code element and described enhancement layer code element are mapped to first constellation combinedly; And
After described padding data, described basic unit code element and described enhancement layer code element are mapped to second constellation combinedly.
4. method as claimed in claim 3 is characterized in that, described first constellation comprises 16 constellation point.
5. method as claimed in claim 3 is characterized in that, described second constellation comprises a QPSK constellation.
6. method as claimed in claim 3 is characterized in that, described second constellation comprises a subclass from the constellation point of described first constellation.
7. method as claimed in claim 3 is characterized in that, with described basic unit code element and described enhancement layer code element be mapped to combinedly described second constellation do not comprise consider described enhancement layer code element ground with described basic unit symbol mapped to described second constellation.
8. the method for claim 1 is characterized in that, described padding data comprises predetermined sequence.
9. the method for claim 1 is characterized in that, described padding data comprises pseudo random sequence.
10. method that in the hierarchical modulation channel, sends layering and non-layered data, described method comprises:
During first time slot of logic channel, generate a hierarchical signal with a plurality of time slots;
Described hierarchical signal is mapped to a layered modulation constellation;
During second time slot of described logic channel, generate a non-layered signal; And
Described hierarchical signal is mapped to a non-layered modulation constellation.
11. method as claimed in claim 10 is characterized in that, further comprises a subclass of described logical channel assignment being given the OFDM subcarrier.
12. method as claimed in claim 10 is characterized in that, described hierarchical signal comprises at least one basic unit's code element and at least one enhancement layer code element.
13. method as claimed in claim 10 is characterized in that, described non-layered signal comprises at least one basic unit's code element and at least one enhancement layer code element, and described at least one enhancement layer code element is to generate by the predetermined padding data of encoding.
14. method as claimed in claim 10 is characterized in that, described non-layered modulation constellation comprises the QPSK constellation.
15. method as claimed in claim 10 is characterized in that, described non-layered modulation constellation comprises a subclass from the constellation point of described layered modulation constellation.
16. a transmitter that is configured to send layering and non-layered data on the hierarchical modulation channel, described transmitter comprises:
The base treatment piece, it is configured to receive base layer data and described base layer data is encoded into some basic units code element;
The enhancement layer processing block, it is configured to receive enhancement data and described enhancement data is encoded into some enhancement layer code elements;
Signal mapper is coupled to described base treatment piece and described enhancement layer processing block, and is configured to the combination of at least one basic unit's code element and at least one enhancement layer code element is mapped to a constellation point; And
Controller, it is configured to determine the termination of described enhancement data, generates padding data in response to the termination of described enhancement data, and described padding data is coupled to described enhancement layer processing block.
17. transmitter as claimed in claim 16 is characterized in that, described controller is further configured to be controlled described signal mapper based on the appearance of described padding data at least in part select a constellation from a plurality of constellation.
18. transmitter as claimed in claim 17, it is characterized in that, described controller is controlled described signal mapper and is selected a non-layered constellation when padding data occurs, and wherein said signal mapper does not consider that described enhancement layer code element ground arrives described non-layered constellation with described basic unit symbol mapped.
19. transmitter as claimed in claim 16 is characterized in that, described controller comprises the padding data maker, and described padding data maker is configured to generate the padding data that comprises predetermined sequence.
20. transmitter as claimed in claim 16 is characterized in that, described controller comprises the padding data maker, and described padding data maker is configured to generate the padding data that comprises pseudo random sequence.
21. transmitter as claimed in claim 16 is characterized in that, described controller comprises the overhead messaging maker, and described overhead messaging maker is configured to generate the overhead messaging that the indication padding data occurs.
22. transmitter as claimed in claim 16 is characterized in that, further comprises channel assignment module, described channel assignment module is configured to modulate a tone with described constellation point.
23. a transmitter that is configured to send layering and non-layered data on the hierarchical modulation channel, described transmitter comprises:
The base treatment piece, it is configured to receive base layer data and described base layer data is encoded into some basic units code element;
The enhancement layer processing block, it is configured to receive enhancement data and described enhancement data is encoded into some enhancement layer code elements;
Controller, it is configured to generate a control signal based on the existence of enhancement data; And
Signal mapper is coupled to described base treatment piece and described enhancement layer processing block, and is configured to based on described control signal described basic unit code element and enhancement layer symbol mapped to a constellation of selecting in the middle of a plurality of constellations.
24. a receiver that is configured to receive layering and non-layered data on the hierarchical modulation channel, described receiver comprises:
Symbol de-interleaver, it is configured to receive by the tone of constellation point modulation and from described tone and generates a basic unit's code element and an enhancement layer code element, and further is configured to generate a decoder control signal;
The base treatment device is coupled to described symbol de-interleaver, and is configured to receive the described basic unit code element and the base layer data of decoding; And
The enhancement layer processor is coupled to described symbol de-interleaver, and is configured to receive described enhancement layer code element and based on described decoder control signal decoding enhancement layer data optionally.
25. receiver as claimed in claim 24 is characterized in that, described enhancement layer decoder further is configured to generate padding data and based on described decoder control signal described padding data is appended to described enhancement data.
26. a transmitter that is configured to launch layering and non-layered data on the hierarchical modulation channel, described transmitter comprises:
Be used for base layer data is encoded into the device of some basic units code element;
Be used to determine to enable the only device of basic mode formula;
Be used in response to the described only device of basic mode formula generation padding data of enabling;
Be used for described padding data is appended to the device of enhancement data; And
The described enhancement data that is used for appending described padding data is encoded into the device of some enhancement layer code elements.
27. transmitter as claimed in claim 26 is characterized in that, further comprises:
Be used for before described padding data described basic unit code element and described enhancement layer code element are mapped to combinedly the device of first constellation; And
Be used for after described padding data described basic unit code element and described enhancement layer code element are mapped to combinedly the device of second constellation.
28. transmitter as claimed in claim 26 is characterized in that, further comprises:
Be used to select the device of at least one basic unit's code element;
Be used to select the device of at least one corresponding enhancement layer code element; And
Be used for the device of selected symbol mapped to a constellation point, described constellation point based on described only basic mode formula whether for enabling.
29. a computer-readable medium of having stored the computer executable instructions of the part that is used to carry out wireless receiver on it, described part comprises:
Receive base layer data;
Described base layer data is encoded into some basic units code element;
Receive enhancement data;
Determine that described enhancement data stopped before described base layer data stops;
Generate padding data;
Described padding data is appended to described enhancement data; And
The described enhancement data of appending described padding data is encoded into some enhancement layer code elements.
30. a computer-readable medium of having stored the computer executable instructions of the part that is used to carry out wireless receiver on it, described part comprises:
During first time slot of logic channel, generate a hierarchical signal with a plurality of time slots;
Described hierarchical signal is mapped to a layered modulation constellation;
During second time slot of described logic channel, generate a non-layered signal; And
Described hierarchical signal is mapped to a non-layered modulation constellation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410043828.5A CN103763068B (en) | 2005-01-11 | 2006-01-11 | Method and apparatus for transmitting layered and non-layered data via layered modulation |
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US64326405P | 2005-01-11 | 2005-01-11 | |
| US60/643,264 | 2005-01-11 | ||
| US66087305P | 2005-03-10 | 2005-03-10 | |
| US60/660,873 | 2005-03-10 | ||
| PCT/US2006/001014 WO2006076451A2 (en) | 2005-01-11 | 2006-01-11 | Methods and apparatus for transmitting layered and non-layered data via layered modulation |
Related Child Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410043828.5A Division CN103763068B (en) | 2005-01-11 | 2006-01-11 | Method and apparatus for transmitting layered and non-layered data via layered modulation |
| CN201010583628.0A Division CN102064914B (en) | 2005-01-11 | 2006-01-11 | Methods and apparatus for transmitting layered and non-layered data via layered modulation |
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| CN101147374A true CN101147374A (en) | 2008-03-19 |
| CN101147374B CN101147374B (en) | 2012-10-17 |
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| ZA (1) | ZA200706259B (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102316056A (en) * | 2010-07-08 | 2012-01-11 | 中兴通讯股份有限公司 | Method and device for processing baseband data |
| CN104521208A (en) * | 2012-08-23 | 2015-04-15 | 三菱电机株式会社 | Communication system, transmission device, receiving device, and digital transmission method |
| CN105940626A (en) * | 2014-11-06 | 2016-09-14 | Lg电子株式会社 | Method and apparatus for receiving broadcast signal, and method and apparatus for transmitting broadcast signal |
| CN111226424A (en) * | 2017-10-20 | 2020-06-02 | 高通股份有限公司 | Multi-layer modulated stream |
| CN112929318A (en) * | 2021-02-09 | 2021-06-08 | 电子科技大学 | Constellation shaping safety access method for optical access network |
| CN113395136A (en) * | 2015-04-06 | 2021-09-14 | Lg电子株式会社 | Broadcast transmitter, broadcast receiver and method for processing broadcast signal |
| EP3518484B1 (en) * | 2016-03-30 | 2024-05-01 | Panasonic Intellectual Property Corporation of America | Transmission device, reception device, transmission method and reception method |
-
2006
- 2006-01-11 CN CN2006800047660A patent/CN101147374B/en not_active Expired - Fee Related
-
2007
- 2007-07-27 ZA ZA200706259A patent/ZA200706259B/en unknown
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102316056A (en) * | 2010-07-08 | 2012-01-11 | 中兴通讯股份有限公司 | Method and device for processing baseband data |
| CN102316056B (en) * | 2010-07-08 | 2014-11-05 | 中兴通讯股份有限公司 | Method and device for processing baseband data |
| CN104521208A (en) * | 2012-08-23 | 2015-04-15 | 三菱电机株式会社 | Communication system, transmission device, receiving device, and digital transmission method |
| CN104521208B (en) * | 2012-08-23 | 2017-11-10 | 三菱电机株式会社 | Communication system, dispensing device, reception device and digit transmission method |
| CN105940626A (en) * | 2014-11-06 | 2016-09-14 | Lg电子株式会社 | Method and apparatus for receiving broadcast signal, and method and apparatus for transmitting broadcast signal |
| CN113395136A (en) * | 2015-04-06 | 2021-09-14 | Lg电子株式会社 | Broadcast transmitter, broadcast receiver and method for processing broadcast signal |
| CN113395136B (en) * | 2015-04-06 | 2023-06-23 | Lg电子株式会社 | Broadcast transmitter, broadcast receiver and method for processing broadcast signal |
| EP3518484B1 (en) * | 2016-03-30 | 2024-05-01 | Panasonic Intellectual Property Corporation of America | Transmission device, reception device, transmission method and reception method |
| CN111226424A (en) * | 2017-10-20 | 2020-06-02 | 高通股份有限公司 | Multi-layer modulated stream |
| CN111226424B (en) * | 2017-10-20 | 2021-03-23 | 高通股份有限公司 | Method and apparatus for wireless communication |
| CN112929318A (en) * | 2021-02-09 | 2021-06-08 | 电子科技大学 | Constellation shaping safety access method for optical access network |
| CN112929318B (en) * | 2021-02-09 | 2022-05-03 | 电子科技大学 | Constellation shaping safety access method for optical access network |
Also Published As
| Publication number | Publication date |
|---|---|
| ZA200706259B (en) | 2008-06-25 |
| CN101147374B (en) | 2012-10-17 |
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