CN103716276A - Multi-service transmission method based on physical layer sub-channel division - Google Patents
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Abstract
The invention discloses a multi-service transmission method based on physical layer sub-channel division. The method comprises the following steps: S1, dividing a physical layer channel into one or more symbol-level physical layer sub-channels in the time domain, the frequency domain and the space domain with constellation mapping symbols as the unit of division according to system parameters and a first service requirement of services; dividing each symbol-level physical layer sub-channel into one or more bit-level physical layer sub-channels in the time domain, the frequency domain and the space domain with the bits in the constellation mapping symbols as the unit of division according to a second service requirement of the services; S3, using each bit-level physical layer sub-channel to carry information of the corresponding service; and S4, transmitting the constellation mapping symbols of all the symbol-level physical layer sub-channels.
Description
Technical field
The present invention relates to communication technical field, be specifically related to a kind of multi-service transmission of dividing based on physical-layer sub-channel.
Background technology
Along with the development of information technology, people present the multi-service features such as increasing mobility, personalization and diversity in the demand of communication.Yet the usable spectrum resource of the wireless communication field especially of communicating by letter is extremely limited.Therefore, one of key problem of future communications system is exactly how more effectively to utilize system usable spectrum resource to support the transmission of multiple business under varying environment, to meet growing multi-service transmission demand.
Current digital TV ground multimedia broadcasting (Digital Television Terrestrial Multimedia Broadcasting, DTMB) adopt based on transport stream (transport stream, TS) the multiplexing multi-service transmission technology of level, is about to come from that the TSLiu YiTSBao Wei unit of different business is multiplexing obtains a TS stream that comprises a plurality of business.TS after multiplexing stream adopts identical coding, interweaves, modulation system is processed, and transmitted with same running time-frequency resource.At receiving terminal, receive signal and after the processing such as demodulation, deinterleaving, decoding, obtain whole TS stream, the bag identifier that demodulation multiplexer flows by each TS (Package Identifier, PID) extracts the data of different business.
The multi-service transmission technology multiplexing based on TS fluid layer has obvious defect, because adopting identical code modulation mode, all business process, demand difference between business is difficult to take into account, especially in the situation that a plurality of business of needs transmission have, different service quality requires, travelling performance requires, requirement of real-time, coverage requirement, is difficult to provide a high efficient coding modulation scheme that is applicable to each business for the demand of polytype business.
Summary of the invention
Technical problem to be solved by this invention is the multi-service transmission that meets different business demand towards single antenna or many antenna transmission systems.
For this purpose, the present invention proposes a kind of multi-service transmission of dividing based on physical-layer sub-channel, and the method comprises:
S1. according to the first business demand of system parameters and each business, in time domain, frequency domain and spatial domain, take constellation mapping symbol as division unit, physical layer channel is cut apart, obtain one or more symbol level physical-layer sub-channels;
S2. according to the second business demand of each business, in time domain, frequency domain and spatial domain, the bit of take in constellation mapping symbol is division unit, and symbol level physical-layer sub-channel is cut apart, and obtains one or more bit-level physical-layer sub-channels;
S3. utilize each bit-level physical-layer sub-channel to carry the information of corresponding business;
S4. launch the constellation mapping symbol of all symbol level physical-layer sub-channels.
Wherein, in step S1, described the first business demand comprises mobility, real-time, service quality, service transmission rate, minimum decoding threshold and receiving terminal complexity, and described system parameters comprises channel condition and system spectral efficiency.
Wherein, described the first business demand is identical, identical with the second business demand or part is identical.
Wherein, in step S1, described constellation mapping symbol adopts OFDM modulation; Described constellation mapping symbol is at certain subcarrier taking after subsequent treatment in time-domain data blocks, and wherein, different time domain data block has identical subcarrier spacing or different subcarrier spacings.
The subcarrier spacing of the time-domain data blocks that wherein, the constellation mapping symbol in prosign level physical straton channel takies is identical.
Wherein, the nonuniform protection degree Image Segmentation Methods Based on Features symbol level physical-layer sub-channel of described step S2 based on bit, the bit-level channel capacity of described bit is larger, and its degree of protection is higher.
Wherein, in step S4, all constellation mapping symbols in prosign level physical straton channel are adopting single-antenna transmission, multi-antenna diversity transmitting or multi-antenna multiplexed transmitting after subsequent treatment, wherein, the constellation mapping symbol of single-antenna transmission and multi-antenna diversity transmitting is scalar complex symbol, the constellation mapping symbol of multi-antenna multiplexed transmitting is vector complex symbol, the modulation system that each dimension of the vector complex symbol of described multi-antenna multiplexed transmitting adopts is identical or different, and the average power of each dimension is identical or different.
Wherein, in step S1, the part constellation mapping symbol that each symbol level physical-layer sub-channel comprises described physical layer channel or all constellation mapping symbol.
Wherein, in step S2, the partial bit of the symbol level physical-layer sub-channel that each bit-level physical-layer sub-channel comprises its place or all bit.
Wherein, each symbol level physical-layer sub-channel is independently selected transformation parameter, and described transformation parameter comprises symbol interleaving and constellation mapping, and each bit-level physical-layer sub-channel is independently selected transformation parameter, and described transformation parameter comprises coding and Bit Interleave.
Than prior art; the beneficial effect of method provided by the invention is: the present invention makes full use of the constellation mapping symbol of different sub carrier interval and different antennae configuration; bit in conjunction with nonuniform protection degree in same constellation mapping symbol; the bit of take is divided physical-layer sub-channel flexibly as least resource particle; maximally utilise running time-frequency resource and the antenna resource of physical layer channel; elevator system efficiency of transmission meets the requirement of different business to business demands such as travelling performance, service quality, transmission rates simultaneously.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 shows a kind of multi-service transmission flow chart of dividing based on physical-layer sub-channel;
Multi-frame structure and symbol level physical-layer sub-channel that Fig. 2 shows in embodiment 2 are cut apart schematic diagram;
Fig. 3 shows the system physical layer channel resource schematic diagram in embodiment 2.
Fig. 4 shows described in embodiment 2 in 16 rank Gray-QAM the bit-level channel capacity of each bit with signal to noise ratio change curve;
Fig. 5 shows the bitslicing figure of the 1st physical-layer sub-channel described in embodiment 2 and the 2nd physical-layer sub-channel;
Fig. 6 shows 64 rank Gray-APSK signal constellation and mappings described in embodiment 2;
Fig. 7 shows the bit-level channel capacity of each bit when single-antenna transmission of 64 rank Gray-QAM described in embodiment 2 with signal to noise ratio change curve;
Fig. 8 shows the bit-level channel capacity of each bit when single-antenna transmission of 64 rank Gray-APSK described in embodiment 2 with signal to noise ratio change curve;
Fig. 9 shows the bitslicing schematic diagram of the 3rd physical-layer sub-channel described in embodiment 2 and the 4th physical-layer sub-channel;
Multi-frame structure and symbol level physical-layer sub-channel that Figure 10 shows in embodiment 3 are cut apart schematic diagram;
Figure 11 shows the bitslicing schematic diagram of the 2nd physical-layer sub-channel described in embodiment 3 and the 3rd physical-layer sub-channel;
Figure 12 shows 256 rank Gray-APSK signal constellation and mappings described in embodiment 3;
Figure 13 shows the bitslicing schematic diagram of the 4th physical-layer sub-channel described in embodiment 3, the 5th physical-layer sub-channel and the 6th physical-layer sub-channel.
Embodiment
The embodiment of the present invention adopts digital baseband equivalent system model.Wherein, the digital baseband signal that transmits and be comprised of transmitting symbol, receives the digital baseband signal that signal is comprised of receiving symbol.Process between transmitting terminal and receiving terminal is equivalent to a discrete symbols channel, i.e. the physical layer channel that the present invention discusses, and its input is constellation mapping symbol with output, launches symbol and receiving symbol.In ofdm system, described constellation mapping symbol takies certain subcarrier in certain time-domain data blocks when transmission; In single-carrier system, described constellation mapping symbol takies certain time-domain symbol when transmission.
The multi-service transmission of dividing based on physical-layer sub-channel described in the embodiment of the present invention can be simultaneously towards the transmission system of single antenna or many antenna transmissions, and constellation mapping symbol is adopting single-antenna transmission, multi-antenna diversity transmitting or multi-antenna multiplexed transmitting after subsequent treatment.The constellation mapping symbol of single-antenna transmission is scalar complex symbol; The constellation mapping symbol of multi-antenna diversity transmitting is scalar complex symbol, by a certain antenna of many antennas, is determined, the symbol that other antennas are launched obtains through certain conversion by the symbol of this antenna transmission; The constellation mapping symbol of multi-antenna multiplexed transmitting is vector complex symbol, its dimension is the antenna number of independent transmitted signal, the modulation system that each dimension of the vector complex symbol of described multi-antenna multiplexed transmitting adopts is identical or different, and the average power of each dimension is identical or different.
The main thought of the embodiment of the present invention is: towards the system of single antenna or many antenna transmissions, propose a kind of multi-service transmission of dividing based on physical-layer sub-channel.First in time domain, frequency domain and spatial domain, take constellation mapping symbol as division unit, physical layer channel is cut apart, obtain symbol level physical-layer sub-channel, wherein constellation mapping symbol is scalar complex symbol or vector complex symbol; Consider in vector complex symbol different dimensions and may adopt different modulation systems, and under high order modulation in same constellation mapping symbol the bit of diverse location there is nonuniform protection degree feature, further take bit as division unit, constellation mapping symbol in symbol level physical-layer sub-channel is cut apart in bit-level, obtained bit-level physical-layer sub-channel; Utilize described bit-level physical-layer sub-channel to carry Multi-service information, the constellation mapping symbol of the process subsequent treatment of all symbol level physical-layer sub-channels of antenna transmission, completes multi-service transmission.
For making object of the present invention, content and advantage clearer, below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples are only for technical scheme of the present invention is more clearly described, and can not limit the scope of the invention with this.
Embodiment 1:
The present embodiment discloses a kind of multi-service transmission of dividing based on physical-layer sub-channel, and as shown in Figure 1, the method comprises:
S1. according to the first business demand of system parameters and each business, in time domain, frequency domain and spatial domain, take constellation mapping symbol as division unit, physical layer channel is cut apart, obtain one or more symbol level physical-layer sub-channels;
In step S1, described constellation mapping symbol adopts OFDM modulation; Wherein, described constellation mapping symbol is at certain subcarrier taking after subsequent treatment in time-domain data blocks; Different time domain data block has identical subcarrier spacing or different subcarrier spacings.
The subcarrier spacing of the time-domain data blocks that wherein, the constellation mapping symbol in prosign level physical straton channel takies is identical.
Mobile telecommunication channel can bring certain doppler spread, and this requirement carries subcarrier spacing in the time-domain data blocks of mobile service and need be greater than certain value and can successfully receive with assurance business.Translational speed is faster, and maximum doppler frequency is larger, higher to sub-carrier spacing requirement.Under fixed-bandwidth, subcarrier spacing is larger, and time domain data block length is less; Subcarrier spacing is less, and time domain data block length is larger.Except mobility, other business demand also can have certain limitation to time domain data block length.For example, when business need high real-time or receiving terminal complexity are when low, time domain data block length can not arrange excessive, and during business need high transfer rate, time domain data block length should not arrange too small.Generally speaking, time domain data block length is too little, can cause overhead proportion larger, thereby system spectral efficiency is declined.Therefore, the configuration of the length of time-domain data blocks need consider business demand and system parameters.
Wherein, when dividing symbol level physical-layer sub-channel according to business demand, described business demand comprises mobility, real-time, service quality, service transmission rate, minimum decoding threshold and receiving terminal complexity etc., and described system parameters comprises channel condition and system spectral efficiency etc.For example, a certain business may have poor channel condition at some subcarrier place of a certain time-domain data blocks, can give other business constellation mapping allocation of symbols corresponding to these subcarriers, and by giving this business to constellation mapping allocation of symbols corresponding to the good subcarrier of this traffic channel conditions, so that reliable service quality to be provided.And for example, can the constellation mapping allocation of symbols in Short Time Domain data block is high to requirement of real-time, high-speed mobile receives or the low business of receiving terminal complexity, and gives non real-time property, low speed mobile reception or the high business of transmission rate request by the constellation mapping allocation of symbols in long time-domain data blocks.
In step S1, the part constellation mapping symbol that each symbol level physical-layer sub-channel comprises described physical layer channel or all constellation mapping symbol.
S2. according to the second business demand of each business, in time domain, frequency domain and spatial domain, the bit of take in constellation mapping symbol is division unit, and symbol level physical-layer sub-channel is cut apart, and obtains one or more bit-level physical-layer sub-channels;
Particularly, the whole bits that all comprise in constellation mapping symbols in certain symbol level physical-layer sub-channel are done as a whole, take bit as minimum division unit is divided into many group bits, every group of bit forms a bit-level physical-layer sub-channel.
Selectable bitslicing strategy has many kinds, corresponding diversified resource distribution mode.Consider the nonuniform protection degree feature of bit, can optimally select a kind of business of a part of bit transfer according to the demand of each business, the another kind of business of other bit transfer, make to maximize system spectral efficiency meeting under the prerequisite of business demand.For example, can select the bit that degree of protection is higher to distribute to the poor business of channel condition, select the lower bit of degree of protection to distribute to the good business of channel condition; Can select the bit that degree of protection is higher to distribute to real time business, select the lower bit of degree of protection to distribute to non-real-time service; Can select the bit that degree of protection is higher to distribute to the high-priority service that quality of service requirement is high, select the lower bit of degree of protection to distribute to the low priority traffice that quality of service requirement is low; Can select the bit that degree of protection is higher to distribute to the business that required decoding threshold is low, select the lower bit of degree of protection to distribute to the business of required decode gates limit for height.Distributing to the bit number of each bit-level physical-layer sub-channel determines according to service transmission rate.In real system, need to consider business demand and system parameters, comprise channel condition, real-time, service quality, decoding threshold, transmission rate etc., divide bit-level physical-layer sub-channel.So long as meet systematic design discipline, meet the bitslicing strategy of business demand, all should be included in the protection range of the present patent application.
Wherein, in constellation mapping symbol, the degree of protection of each bit can be determined according to the bit-level channel capacity of each bit, and described bit-level channel capacity is larger, and the degree of protection of bit is higher.At a receiving terminal, adopt in the coded modulation scheme of independent demapping, each bit in prosign can be considered as the subchannel of a binary system input of independent experience, the Average Mutual of input binary bits and channel Output rusults is considered as the channel capacity of this subchannel, the i.e. bit-level channel capacity of i bit, computational methods are:
Wherein x is channel input, and y is channel output, and χ represents the set of the constellation mapping symbol of channel input,
represent that i bit is that the constellation mapping character subset of b closes.
In step S2, the partial bit of the symbol level physical-layer sub-channel that each bit-level physical-layer sub-channel comprises its place or all bit.
S3. utilize each bit-level physical-layer sub-channel to carry the information of corresponding business;
S4. launch the constellation mapping symbol of all symbol level physical-layer sub-channels.
Wherein, in step S4, all constellation mapping symbols in prosign level physical straton channel are adopting single-antenna transmission, multi-antenna diversity transmitting or multi-antenna multiplexed transmitting after subsequent treatment, wherein, the constellation mapping symbol of single-antenna transmission and multi-antenna diversity transmitting is scalar complex symbol, the constellation mapping symbol of multi-antenna multiplexed transmitting is vector complex symbol, the modulation system that each dimension of the vector complex symbol of described multi-antenna multiplexed transmitting adopts can be the same or different, and the average power of each dimension can be the same or different.
Each symbol level physical-layer sub-channel can independently be selected transformation parameter, and described transformation parameter includes but not limited to symbol interleaving or constellation mapping; Each bit-level physical-layer sub-channel can independently be selected transformation parameter, and described transformation parameter includes but not limited to coding or Bit Interleave.Described " independent select " refers to that every sub-channels can select transformation parameter separately according to business demand and channel condition independently, is not subject to the impact of other subchannels.
Method described in the present embodiment, transmission system towards single antenna or many antenna transmissions, the least resource particle that the bit of take is divided as physical layer channel, cascade to physical layer channel based on symbol and bit is cut apart, obtain bit-level physical-layer sub-channel, maximally utilise running time-frequency resource and the antenna resource of physical layer channel, elevator system spectrum efficiency meets the business demand such as travelling performance, service quality, transmission rate of different business simultaneously.
For single-carrier system, the physical-layer sub-channel dividing mode that the present embodiment adopts is still applicable.
Embodiment 2:
The application scenarios of the present embodiment is a kind of comprehensive multi-media broadcasting system based on China Digital TV terrestrial broadcasting standard, described comprehensive multi-media broadcasting system bandwidth is 8MHz, needs to transmit high-definition television program, Standard Definition Television program, mobile phone TV services and data in mobile phone business in this system.Wherein, HDTV (High-Definition Television) business and Standard Definition Television business are fixed receptions, and wherein HDTV (High-Definition Television) business need transmission data rate is high; Standard Definition Television business requires medium to transmission data rate.Mobile phone TV services and data in mobile phone business are mobile receptions, and wherein mobile phone TV services are lower to transmission rate request; Data in mobile phone business is low to transmission rate request.
The present embodiment specifically discloses a kind of multi-service transmission of dividing based on physical-layer sub-channel, and the method comprises:
S1. according to the first business demand of system parameters and each business, in time domain, frequency domain and spatial domain, take constellation mapping symbol as division unit, physical layer channel is cut apart, obtain one or more symbol level physical-layer sub-channels;
Concrete, the present embodiment adopts time-domain filtering moulding, and formed filter is chosen as SRRC filter, and wherein, roll-off factor is 0.05; Adopt OFDM modulation, will treat that constellation mapping symbol obtains time-domain data blocks through IDFT conversion.
Selecting basic symbol speed is Fs=7.56MHz, and basic symbol is spaced apart (1/7.56) us.For channel management and resource distribute flexible, definition multi-frame is the frame structure on time-domain data blocks, each multi-frame is comprised of a plurality of physical layer time-domain data blocks and auxiliary signal.
In the present embodiment, multi-frame is comprised of auxiliary signal and two time-domain data blocks, with reference to time-domain synchronization OFDM (Time Domain Synchronous Orthogonal Frequency Division Multiplexing, TDS-OFDM) technology, by known frequency domain binary sequence, through IDFT, conversion obtains time domain binary sequence and through cyclic extensions, obtains 1024 symbols of overall length auxiliary signal.Time-domain data blocks 1 is for transmitting mobile phone TV services and the data in mobile phone business of mobile reception, and time-domain data blocks 2 is for transmitting HDTV (High-Definition Television) business and the Standard Definition Television business of fixed reception.Consider service mobility and transmission rate requirements, the length that time-domain data blocks 1 is set is 2048 constellation mapping symbols, subcarrier spacing 7.56MHz/2048=3.691kHz, the length that time-domain data blocks 2 is set is 8192 constellation mapping symbols, subcarrier spacing 7.56MHz/8192=0.923kHz.
As shown in Figure 2, described physical layer channel is split into two symbol level physical-layer sub-channels, wherein, by the whole allocation of symbols in time-domain data blocks 1 to symbol level physical-layer sub-channel A
1, by the whole allocation of symbols in time-domain data blocks 2 to symbol level physical-layer sub-channel A
2.Wherein, the subcarrier that lateral arrows signal is placed continuously.
Wherein, symbol level physical-layer sub-channel A
1be used for transmitting the business of mobile reception, symbol level physical-layer sub-channel A
2be used for transmitting the business of fixed reception.
Wherein, symbol level physical-layer sub-channel A
1in constellation mapping symbol adopt dual-antenna diversity transmitting, be scalar complex symbol; Symbol level reason straton channel A
2in symbol adopt the multiplexing transmitting of double antenna, be two-dimensional vector complex symbol.Fig. 3 has provided by the definite system physical layer channel resource of the independent equivalent channel of transmitting.
S2. according to the second business demand of each business, in time domain, frequency domain and spatial domain, the bit of take in constellation mapping symbol is division unit, and symbol level physical-layer sub-channel is cut apart, and obtains one or more bit-level physical-layer sub-channels;
Wherein, symbol level physical-layer sub-channel A
1in constellation mapping symbol be scalar complex symbol, modulation system adopts the Gray-QAM on 16 rank, each constellation mapping symbol carries 4 bits, the bit (b in each symbol
0,16QAM～b
3,16QAM) corresponding bit-level channel capacity as shown in Figure 4.As shown in Figure 4, the peculiar 2 kinds of different degree of protections of ratio in 16 rank Gray-QAM, bit-level channel capacity is higher, and degree of protection is higher.
In the present embodiment, consider that mobile phone TV services need to provide image quality clearly, higher than data in mobile phone business to the requirement of service quality, preferentially select the bit that bit-level channel capacity is high to distribute to mobile phone TV services.Symbol level physical-layer sub-channel A
1be split into two bit-level physical-layer sub-channels, dividing method is specially: by the every P of constellation mapping symbol
1individual is one group, altogether 4P
1the highest Q of channel capacity in individual bit
1individual bit is assigned to i.e. the 1st physical-layer sub-channel of a bit-level physical-layer sub-channel, for transmitting cell-phone television services, and all the other 4P
1-Q
1individual bit is assigned to i.e. the 2nd physical-layer sub-channel of another bit-level physical-layer sub-channel, for transmitting cell-phone data service.
In the present embodiment, according to the transmission rate request of mobile phone TV services and data in mobile phone business, get P
1=15, Q
1the bitslicing of the=23,1st physical-layer sub-channel and the 2nd physical-layer sub-channel as shown in Figure 5.
Symbol level physical-layer sub-channel A
2constellation mapping symbol be two-dimensional vector complex symbol, a dimension adopts 64 rank Gray-QAM to modulate, another dimension adopts 64 rank Gray-APSK to modulate.Each vector complex symbol carries 12 kinds of bit (b
0,64QAM～b
5,64QAMand b
0,64APSK～b
5,64APSK).Described 64 rank Gray-APSK are 4 planispheres that ring forms, and the number of constellation points on each ring is 16, and its signal constellation and mapping as shown in Figure 6.While adopting single-antenna transmission, the bit-level channel capacity that in 64 rank Gray-QAM and 64 rank Gray-APSK, each bit is corresponding respectively as shown in Figure 7 and Figure 8.The average power of each dimension of vector complex symbol can be set as identical value according to business demand and antenna configuration also can be set as different value.To sum up, while adopting multi-antenna multiplexed transmitting, the channel capacity that in prosign, each bit is corresponding also has larger difference.
In the present embodiment, consider that the required decoding threshold of Standard Definition Television business is low, the required decode gates limit for height of HDTV (High-Definition Television) business, preferentially selects the bit that bit-level channel capacity is high to distribute to Standard Definition Television business.Symbol level physical-layer sub-channel A
2be split into two bit-level physical-layer sub-channels, dividing method is specially: by the every P of constellation mapping symbol
2individual is one group, by 12P
2the highest Q of channel capacity in individual bit
2individual bit is assigned to i.e. the 3rd physical-layer sub-channel of a bit-level physical-layer sub-channel, for transmitting Standard Definition Television business, all the other 12P
2-Q
2individual bit is assigned to i.e. the 4th physical-layer sub-channel of another bit-level physical-layer sub-channel, for transmitting HDTV (High-Definition Television) business.
In the present embodiment, according to the transmission rate request of Standard Definition Television business and HDTV (High-Definition Television) business, get P
2=15, Q
2the bitslicing of the=50,3rd physical-layer sub-channel and the 4th physical-layer sub-channel as shown in Figure 9.
S3. utilize each bit-level physical-layer sub-channel to carry the information of corresponding business;
S4. launch the constellation mapping symbol of all symbol level physical-layer sub-channels.
The transmission mode of all physical-layer sub-channels arranges as shown in table 1:
Table 1 subchannel transmission pattern arranges result
Adopt the physical-layer sub-channel transmission mode shown in table 1, the transmission rate of the 1st physical-layer sub-channel is 7.56* (2/11) * 4*0.4* (23/60)=0.843Mbps;
Wherein, 7.56 finger basic symbol speed are Fs=7.56MHz, and (2/11) refers to the ratio of time-domain data blocks 1 shared running time-frequency resource in whole multi-frame: 2048/ (1024+2048+8196)=2/11; When 4 representatives adopt to adopt 16QAM modulation, each scalar complex symbol carries 4 bits, and 0.4 represents encoder bit rate, and 23/60 is illustrated in bit-level physical-layer sub-channel all 23/60 of bit numbers is divided into the 1st physical-layer sub-channel in time-domain data blocks 1 after dividing.The transmission rate of the 2nd physical-layer sub-channel is 7.56* (2/11) * 4*0.5* (37/60)=1.695Mbps; The transmission rate of the 3rd physical-layer sub-channel is 7.56* (8/11) * 12*0.6* (50/180)=10.996Mbps; The transmission rate of the 4th physical-layer sub-channel is 7.56* (8/11) * 12*0.8* (130/180)=38.121Mbps.
The transmission rate of above-mentioned 4 bit-level physical-layer sub-channels meets respectively the transmission rate requirements of the business carrying separately.The receiving equipment of each business can select many antenna receptions or single antenna to receive according to the computing capability of self, condition of acceptance and business demand etc.
In the present embodiment, mobile phone TV services and data in mobile phone business can occupy the impact that the time-domain data blocks of larger subcarrier spacing transmits to resist doppler spread in high-speed mobile, adopt higher average power to improve the coverage of business, and utilize multi-antenna diversity transmitting to improve transmission reliability; Standard Definition Television business and HDTV (High-Definition Television) business can occupy the time-domain data blocks that subcarrier spacing is less and transmit and utilize multi-antenna multiplexed transmitting to improve service transmission rate.In addition; the least resource particle that the bit of take is divided as physical layer channel; according to unequal error protection feature, by bit flexible allocation, give each physical-layer sub-channel; can make full use of the sign resources of different sub carrier interval and different antennae configuration in time frequency space; in conjunction with the bit of nonuniform protection in prosign, meet the transmission demand that a plurality of business are different.
Embodiment 3:
The present embodiment is towards radio communication multiservice system, described system bandwidth is 8MHz, business transmission towards a plurality of users is provided in 735MHz-743MHz frequency range, comprise user 1 high-speed mobile business 1A and 1B, user 2 high-speed mobile business 2, user 3 high-speed mobile business 3, user's 4 low speed mobile service 4, user 5 low speed mobile service 5, user 6 fixedly accept business 6.Wherein low speed mobile service 4 is real-time service, and other business are non-real time service.
The present embodiment specifically discloses a kind of multi-service transmission of dividing based on physical-layer sub-channel, and the method comprises:
S1. according to the first business demand of system parameters and each business, in time domain, frequency domain and spatial domain, take constellation mapping symbol as division unit, physical layer channel is cut apart, obtain one or more symbol level physical-layer sub-channels;
The present embodiment adopts OFDM modulation, and constellation mapping symbol to be passed is obtained to time-domain data blocks through IDFT conversion.Selecting basic symbol speed is Fs=7.56MHz, and basic symbol is spaced apart (1/7.56) us.For channel management and resource distribute flexible, definition multi-frame is the frame structure on time-domain data blocks.Each multi-frame is comprised of two time-domain data blocks and auxiliary signal.Time-domain data blocks 1 is for transmitting high speed mobile service 1A and 2A, high-speed mobile business 2 and high-speed mobile business 3, and time-domain data blocks 2 is for transmitting low speed mobile service 4, low speed mobile service 5 and fixed reception business 6.In the present embodiment, the transmission rate request of business 4,5,6 is higher, and the transmission rate request of business 1,2,3 is lower.Consider service mobility, real-time and transmission rate requirements, it is 1024 symbols that auxiliary signal length is set, the length of time-domain data blocks 1 is 2048 symbols, subcarrier spacing 7.56MHz/2048=3.691kHz, the length of time-domain data blocks 2 is 4096 symbols, subcarrier spacing 7.56MHz/4096=1.846kHz.
The high-speed mobile business 1A of user oriented 1 and 1B channel condition in 737MHz-742MHz frequency range is better, and channel condition is poor in other frequency ranges, supporting business receives well, and other users have good channel condition in 735MHz-743MHz frequency range.Take constellation mapping symbol when division unit is cut apart physical-layer sub-channel, preferentially the subcarrier in 737MHz-742MHz frequency range is being allocated to user 1 high-speed mobile business 1A, 1B.
Consider traffic channel conditions, transmission rate requirements and multi-frame structure, described physical layer channel is split into three symbol level physical-layer sub-channels, i.e. B
1subchannel, B
2subchannel and B
3subchannel, as shown in figure 10, the subcarrier that lateral arrows signal is wherein placed continuously.Symbol level physical-layer sub-channel B
1occupy 1024 constellation mapping symbols corresponding to 1024 subcarriers from label 512 to label 1535 in time-domain data blocks 1, symbol adopts single-antenna transmission, is scalar complex symbol; Symbol level physical-layer sub-channel B
2occupy other 1024 the constellation mapping symbols in time-domain data blocks 1, symbol adopts the multiplexing transmitting of double antenna, is 2 n dimensional vector n complex symbols; Symbol level physical-layer sub-channel B
3occupy the whole constellation mapping symbols in time-domain data blocks 2, symbol adopts the multiplexing transmitting of double antenna, is 2 n dimensional vector n complex symbols.
Wherein, symbol level physical-layer sub-channel B
1be used for transmitting high speed mobile service 1A, 1B, symbol level physical-layer sub-channel B
2be used for transmitting high speed mobile service 2,3, symbol level physical-layer sub-channel B
3be used for transmitting low speed mobile service 4,5 and fixed reception business 6.
S2. according to the second business demand of each business, in time domain, frequency domain and spatial domain, the bit of take in constellation mapping symbol is division unit, and symbol level physical-layer sub-channel is cut apart, and obtains one or more bit-level physical-layer sub-channels;
Wherein, symbol level physical-layer sub-channel B
1in constellation mapping symbol be scalar complex symbol, modulation system adopts QPSK, each scalar complex symbol carries 2 bit (b
0, QPSK～b
1, QPSK), its corresponding bit-level channel capacity is equal, and the degree of protection of 2 bits is identical.By symbol level physical-layer sub-channel B
1in all the whole bits in constellation mapping symbols be attributed to a bit-level physical-layer sub-channel, i.e. the 1st physical-layer sub-channel, for high-speed mobile business 1A, the 1B of transmission user 1.The data flow of 1A, 1B two-way business mixes at transport stream level, is loaded into the 1st physical-layer sub-channel, adopts same coded modulation and subsequent treatment.
Symbol level physical-layer sub-channel B
2in constellation mapping symbol be two-dimensional vector complex symbol, a dimension adopts 64 rank Gray-QAM to modulate, another dimension adopts 16 rank Gray-QAM to modulate, each vector complex symbol carries 10 bit (b
0,64QAM～b
5,64QAMand b
0,16QAM～b
3,16QAM).
Priority ratio user 3 height due to user 2, be that the QoS requirement of business 2 is than business 3 height, take bit when division unit is divided bit-level physical-layer sub-channel, the preferential high bit of bit-level channel capacity of selecting is distributed to business 2, distributes to the bit number of each bit-level physical-layer sub-channel according to service transmission rate Location of requirement.Symbol level physical-layer sub-channel B
2be divided into two bit-level physical-layer sub-channels, concrete dividing method is: by every 15 of constellation mapping symbol, be one group, with bitslicing method as shown in figure 11, obtain the 2nd physical-layer sub-channel and the 3rd physical-layer sub-channel, carry respectively high-speed mobile data service 2 and high-speed mobile data service 3.
Symbol level physical-layer sub-channel B
3in constellation mapping symbol be two-dimensional vector complex symbol, a dimension adopts 64 rank Gray-APSK to modulate, another dimension adopts 256 rank Gray-APSK to modulate, the signal constellation and mapping of 256 rank Gray-APSK is as shown in figure 12.Each vector complex symbol carries 14 bit (b
0,64APSK～b
5,64APSKand b
0,256APSK～b
7,256APSK).The requirement of real-time of considering business 4 is high, bad channel conditions, preferentially selects the highest bit of bit-level channel capacity to distribute to business 4; Although business 5 does not have requirement of real-time, its channel condition is poor compared with business 6, selects bit-level channel capacity time high bit to distribute to business 5; The transmission rate request of business 6 is high, and the bit of therefore distributing to business 6 is maximum.Consider real-time, channel condition, the transmission rate requirements of each business, by symbol level physical-layer sub-channel B
3be divided into three bit-level physical-layer sub-channels, concrete dividing method is: by every 20 of symbol, be one group, with bitslicing method as shown in figure 13, obtain the 4th physical-layer sub-channel, the 5th physical-layer sub-channel and the 6th physical-layer sub-channel, carry respectively low speed mobile service 4, low speed mobile service 5 and fixed reception business 6.
S3. utilize each bit-level physical-layer sub-channel to carry the information of corresponding business;
S4. launch the constellation mapping symbol of all symbol level physical-layer sub-channels.
The transmission parameter settings of all bit-level physical-layer sub-channels is as shown in table 2:
Table 2 subchannel transmission pattern arranges result
The receiving equipment of each business can select many antenna receptions or single antenna to receive according to the complexity requirement of self, business demand etc.
Although described by reference to the accompanying drawings embodiments of the present invention, but those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, such modification and modification all fall into by within claims limited range.
Claims (10)
1. a multi-service transmission of dividing based on physical-layer sub-channel, is characterized in that, the method comprises:
S1. according to the first business demand of system parameters and each business, in time domain, frequency domain and spatial domain, take constellation mapping symbol as division unit, physical layer channel is cut apart, obtain one or more symbol level physical-layer sub-channels;
S2. according to the second business demand of each business, in time domain, frequency domain and spatial domain, the bit of take in constellation mapping symbol is division unit, and symbol level physical-layer sub-channel is cut apart, and obtains one or more bit-level physical-layer sub-channels;
S3. utilize each bit-level physical-layer sub-channel to carry the information of corresponding business;
S4. launch the constellation mapping symbol of all symbol level physical-layer sub-channels.
2. method according to claim 1, it is characterized in that, in step S1, described the first business demand comprises mobility, real-time, service quality, service transmission rate, minimum decoding threshold and receiving terminal complexity, and described system parameters comprises channel condition and system spectral efficiency.
3. method according to claim 1, is characterized in that, described the first business demand is not identical, identical with the second business demand or part is identical.
4. method according to claim 1, is characterized in that, in step S1, described constellation mapping symbol adopts OFDM modulation; Described constellation mapping symbol is at certain subcarrier taking after subsequent treatment in time-domain data blocks, and wherein, different time domain data block has identical subcarrier spacing or different subcarrier spacings.
5. method according to claim 4, the subcarrier spacing of the time-domain data blocks that the constellation mapping symbol in prosign level physical straton channel takies is identical.
6. method according to claim 1, is characterized in that, the nonuniform protection degree Image Segmentation Methods Based on Features symbol level physical-layer sub-channel of described step S2 based on bit, and the bit-level channel capacity of described bit is larger, and its degree of protection is higher.
7. method according to claim 1, it is characterized in that, in step S4, all constellation mapping symbols in prosign level physical straton channel are adopting single-antenna transmission after subsequent treatment, multi-antenna diversity transmitting or multi-antenna multiplexed transmitting, wherein, the constellation mapping symbol of single-antenna transmission and multi-antenna diversity transmitting is scalar complex symbol, the constellation mapping symbol of multi-antenna multiplexed transmitting is vector complex symbol, the modulation system that each dimension of the vector complex symbol of described multi-antenna multiplexed transmitting adopts is identical or different, the average power of each dimension is identical or different.
8. method according to claim 1, is characterized in that, in step S1, and the part constellation mapping symbol that each symbol level physical-layer sub-channel comprises described physical layer channel or all constellation mapping symbol.
9. method according to claim 1, is characterized in that, in step S2, and the partial bit of the symbol level physical-layer sub-channel that each bit-level physical-layer sub-channel comprises its place or all bit.
10. method according to claim 1, is characterized in that, each symbol level physical-layer sub-channel is independently selected transformation parameter, and described transformation parameter comprises symbol interleaving and constellation mapping; Each bit-level physical-layer sub-channel is independently selected transformation parameter, and described transformation parameter comprises coding and Bit Interleave.
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