CN102938748A - Multiservice transmission method for physical layer component channel based on bit level - Google Patents
Multiservice transmission method for physical layer component channel based on bit level Download PDFInfo
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Abstract
The invention provides a multiservice transmission method for a physical layer component channel based on a bit level. The method comprises the following steps: A, dividing a physical layer channel at a symbol level according to service quality requirements of a plurality of services needed to be transmitted, so as to acquire a physical layer component channel at the symbol level; B, dividing the physical layer component channel of the symbol level at a bit level according to the service quality requirements of the plurality of services needed to be transmitted, so as to acquire a physical layer component channel on a bit layer; and C, using the physical layer component channel of the bit layer to transmit the corresponding service information. According to the multiservice transmission method disclosed by the invention, a bit with different protection degrees inside one symbol is subjected to physical layer component channels at different bit layers, so that service quality requirements of different services are satisfied more flexibly.
Description
Technical field
The present invention relates to digital information transmission technical field, particularly a kind of multi-service transmission of the physical-layer sub-channel based on the bit level.
Background technology
In digital TV ground broadcasting transmission is used, in order more effectively to utilize frequency spectrum resource, satisfy the multiple business demand, need to utilize same physical layer channel to transmit a plurality of business.Different business is also different to the requirement of the service quality (Quality of Service, QoS) of system, and wherein service quality comprises coverage and data transmission rate etc.
In traditional digital television and broadcasting transinission system, digital TV ground multimedia broadcasting (Digital Television Terrestrial Multimedia Broadcasting for example, DTMB) and digital video wired broadcasting (Digital Video Cable Broadcasting, DVB-C), the transmission of a plurality of business is mainly by transmitting stream (transport stream, TS) the multiplexing of level realized, namely will belong to TS stream (take the TS bag as unit) the process TS bag multiplexer of different business at transmitting terminal, be multiplexed with a TS stream that comprises a plurality of business.To the stream of the TS after multiplexing, carry out identical modulation, and in same physical layer channel, transmit.At receiving terminal, receiving equipment carries out obtaining whole TS streams after the demodulation to the received signal, and demodulation multiplexer is finished demultiplexing by the data of bag identifier (Package Identifier, PID) the differentiation different business of each TS stream.But adopt the multiplexing of TS fluid layer time, different business adopts identical code modulation mode, and namely for identical receiving terminal and transmission condition, the signal-noise ratio threshold of demodulation is identical, therefore the coverage of different business is identical, can not adapt to the difference of different business coverage.
European first generation ground digital television broadcast transmission standard digital video terrestrial wireless broadcast (the Digital Video Terrestrial Broadcasting that announced in 1997, DVB-T) in, having proposed the Delamination Transmission technology supports the business of different priorities to transmit, wherein the key technology of physical layer is hierarchical modulation (Hierarchical modulation, HM) technology.Be the bit stream of high priority be used for selecting the to have larger minimum euclidean distance constellation subset of (Minimum Euclidean Distance, MED), the bit stream of low priority is used for selecting to have the constellation subset of less MED.But adopt the overall transmission efficiency of the system of Delamination Transmission technology to descend, and the bit that constellation symbol is carried is limited, causes to the mode of different business Resources allocation limited.
In the digital communication system, be converted to discrete symbols after binary bits process chnnel coding, Bit Interleave and the constellation mapping etc., carry out again the subsequent treatment such as orthogonal frequency division multiplexi (Orthogonal Frequency Division Multiplexing, OFDM) modulation, framing, quadrature modulation.For band-limited channel, based on piece transmission technology or channel equalization technique, actual continuous time, channel can equivalence be the discrete time channel, the digital baseband model that the transmission model can equivalence represents for discrete symbols, wherein, the signal space of discrete symbols can be time domain, frequency domain and spatial domain etc., that is, time, frequency (or subcarrier), space resources (being the antenna resource) etc. are portability discrete symbols waiting for transmission all.
Among the second generation terrestrial DTV transmission standard DVB-T2 of Europe, introduced physical layer pipe (Physical Layer Pipe, PLP) technology, namely a kind of physical-layer sub-channel technology is dealt with in the terrestrial digital television system the more and more higher demand of a plurality of professional transmission.Its basic thought is: according to concrete application scenarios, the time-frequency domain resources of same physical layer channel is divided into a plurality of independently physical-layer sub-channels, every sub-channels can adopt the different coding modulation system, carries different business, and supports the receiver demodulation by physical layer signaling.At first demodulation of receiver, decode and parse physical layer signaling, obtain the information such as code modulation mode of every sub-channels, then the business datum in the required physical-layer sub-channel is carried out demodulating and decoding.
As a kind of working method that realizes the resource flexible allocation, the physical-layer sub-channel technology is fit to a plurality of professional transmission very much, has become the major way that current multiple digital television terrestrial broadcast system supports that a plurality of business are compatible and transmit.What is particularly worth mentioning is that, Long Term Evolution (Long Term Evolution, LTE) and the follow-up evolution (LTE-Advanced of LTE technology, LTE-A) employed resource mapping technology based on " resource particle " and " Resource Block " in the system, in essence with the physical-layer sub-channel technology type seemingly, all be physical layer channel to be cut apart obtain physical-layer sub-channel, then utilize the physical sub-channels of gained to transmit the technology of a plurality of business.
But be based on a plurality of professional transmission of traditional physical-layer sub-channel technology; the problem that still exists: basic channel unit is the set of the symbol composition in one group of time domain, frequency domain, spatial domain or code territory; bit in each symbol is assigned to same physical-layer sub-channel without distinction, has ignored the characteristic that bit in the same constellation symbol has different error protection degree.
Summary of the invention
(1) technical problem that solves
The technical problem to be solved in the present invention is: propose a kind of new multi-service transmission, remedy hierarchical modulation technology or the not high problem of the overall spectrum efficiency of conventional physical subchannel technology, the present invention is intended to improve the efficiency of transmission of system and the flexibility of a plurality of professional transmission.
(2) technical scheme
The present invention proposes a kind of multi-service transmission of the physical-layer sub-channel based on the bit level, described method comprises:
A, according to the quality of service requirement of a plurality of business of required transmission, physical layer channel is cut apart at the symbol level, obtain the physical-layer sub-channel of symbol level;
B, according to the quality of service requirement of a plurality of business of described required transmission, the physical-layer sub-channel of described symbol level is cut apart at the bit level, obtain the physical-layer sub-channel of bit level;
C, utilize a plurality of business information corresponding to physical-layer sub-channel transmission of described bit level.
Preferably, specifically comprise in the steps A: according to the quality of service requirement of a plurality of business of described required transmission, be α with ratio in the physical layer channel
iSymbol be attributed to the physical-layer sub-channel of a symbol level, wherein α
1+ α
2+ ...+α
N=1,0＜α
i＜1,1≤i≤N.
Preferably, the signal space under the described symbol is one or more in time domain, frequency domain, spatial domain or the code territory.
Preferably, the physical-layer sub-channel of each described symbol level comprises a part of symbol of described physical layer channel in the steps A;
Or,
The physical-layer sub-channel of each described symbol level comprises whole symbols of described physical layer channel.
Preferably, the quality of service requirement of a plurality of business of required transmission described in the steps A comprises professional quantity, the message transmission rate of business and required minimum decoding threshold.
Preferably, step B specifically comprises: according to the requirement of the service quality of a plurality of business of described required transmission, do a plurality of symbols in the physical-layer sub-channel of described symbol level as a whole, carry out further cutting apart of bit level, cut apart the physical-layer sub-channel that the every part that obtains forms a bit level.
Preferably, the physical-layer sub-channel of each described bit level comprises a part of bit of the physical-layer sub-channel of described symbol level;
Or,
The physical-layer sub-channel of each described bit level comprises whole bits of the physical-layer sub-channel of described symbol level.
(3) beneficial effect
The multi-service transmission based on the physical-layer sub-channel of bit level that the present invention proposes, physical layer channel is cut apart at the symbol level, obtain the physical-layer sub-channel of symbol level, again the physical-layer sub-channel of symbol level is cut apart at the bit level, obtained the physical-layer sub-channel of bit level.Belong to the physical-layer sub-channel of different bit levels by the bit that will have different degree of protections in the symbol, satisfied more neatly the requirement of different user to service quality.
Description of drawings
Fig. 1 is the flow chart of the multi-service transmission of the physical-layer sub-channel based on the bit level of the present invention;
Fig. 2 is 256 rank Gray-QAM signal constellation and mappings described in the embodiment of the invention 2;
Fig. 3 be described in the embodiment of the invention 2 in the 256 rank Gray-QAM constellation mapping channel capacity of each bit with the signal to noise ratio change curve;
Fig. 4 is in the embodiment of the invention 2, adopts the method for the invention, and two kinds of business reach the minimum decoding threshold figure of required transmission rate under the various Bit Allocation in Discrete schemes;
Fig. 5 is among the inventive example embodiment 2, the resource mapping figure of the physical-layer sub-channel of bit level;
Fig. 6 is the embodiment of the invention 2 described three kinds of methods for a plurality of professional transmission, and system reaches the minimum decoding threshold figure of required transfer rate under different schemes;
Fig. 7 is 256 rank Gray-APSK planispheres described in the embodiment of the invention 3;
Fig. 8 is described in the embodiment of the invention 3 in the 256 rank Gray-APSK constellation mapping, the channel capacity that bit is corresponding and Between Signal To Noise Ratio figure;
Fig. 9 is in the embodiment of the invention 3, adopts the method for the invention, two kinds of business transmission rate figure under given minimum decoding threshold under the various Bit Allocation in Discrete schemes;
Figure 10 is among the inventive example embodiment 3, the resource mapping figure of the physical-layer sub-channel of bit level;
Figure 11 is the embodiment of the invention 3 described three kinds of methods for a plurality of professional transmission, when adopting different schemes, and three kinds of transfer rates that business reaches.
Embodiment
For physical layer channel, only consider that in the present invention bits switch is to the process of digital baseband signal in the digital baseband equivalent model, the digital baseband signal that transmits and form by sending symbol receives the digital baseband signal that signal is comprised of receiving symbol.Send symbol and receiving symbol and be discrete symbols, send the decline of symbol channel and also obtain discrete receiving symbol behind the superimposed noise (comprising interference).Therefore can be a discrete symbols channel with the process model building between transmitting terminal and the receiving terminal, it is physical layer channel, its input and output all equivalence are symbol, namely send symbol and receiving symbol, wherein the signal space under the symbol can in time domain, frequency domain, spatial domain or the code territory any one or a plurality of.For example, in the OFDM block transmission system, the signal space under the symbol only is time domain and frequency domain.
In traditional physical-layer sub-channel technology, physical layer channel is cut apart at the symbol level, obtain the physical-layer sub-channel of one or more symbol levels, wherein, the physical-layer sub-channel of each symbol level comprises a part of symbol or whole symbol of physical layer channel.The physical-layer sub-channel of each symbol level adopts identical frame structure parameter and code modulation mode usually, usually supports a kind of business; Utilize the physical-layer sub-channel of multiple symbol level to support multiple business.
Main thought of the present invention is: with during received terrestrial digital broadcasting is communicated by letter, propose a kind of new multi-service transmission: at first physical layer channel is cut apart at the symbol level, obtained the physical-layer sub-channel of symbol level at wideband wireless mobile communication; Then, utilize the bit that carries in the same constellation symbol of high-order constellation mapping to have the characteristic of non-uniform error degree of protection, in the physical-layer sub-channel of symbol level, the whole bits that carry take a plurality of symbols are as a unit, further cut apart at the bit level, obtain the physical-layer sub-channel of bit level, wherein, the physical-layer sub-channel of each bit level only comprises a part of bit or whole bit of the physical-layer sub-channel of symbol level; Utilize at last the physical-layer sub-channel of the bit level of gained to transmit a plurality of business information.
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples are used for explanation the present invention, but are not used for limiting the scope of the invention.
Do not consider that in order to remedy traditional physical-layer sub-channel technology the bit in the same constellation symbol has the problem of kinds of protect degree, for the resource distribution mode that enriches a plurality of professional transmission and the overall transmission efficiency that improves a plurality of professional transmission.The flow chart of the multi-service transmission of the physical-layer sub-channel based on the bit level of the present invention specifically may further comprise the steps as shown in Figure 1:
A, according to the quality of service requirement of a plurality of business of required transmission, physical layer channel is cut apart at the symbol level, obtain the physical-layer sub-channel of symbol level;
Wherein, in the baseband model of communication system, physical layer channel can equivalence be a discrete symbols channel, and its input and output equivalence is symbol, namely send symbol and receiving symbol, wherein the signal space under the symbol be in time domain, frequency domain, spatial domain or the code territory any one or a plurality of.
Wherein, the quality of service requirement of a plurality of business of required transmission comprises professional quantity, the message transmission rate of business and required minimum decoding threshold.
Wherein, physical layer channel is specially at the dividing method of symbol level: suppose to be split in the physical layer channel physical-layer sub-channel of N symbol level, in physical layer channel, ratio is α
iSymbol be attributed to the physical-layer sub-channel of a symbol level, wherein, α
1+ α
2+ ...+α
N=1,0＜α
i＜1,1≤i≤N.The physical-layer sub-channel of each symbol level comprises a part of symbol of described physical layer channel, or the physical-layer sub-channel of each symbol level comprises whole symbols of described physical layer channel.
B, according to the quality of service requirement of a plurality of business of described required transmission, the physical-layer sub-channel of described symbol level is cut apart at the bit level, obtain the physical-layer sub-channel of bit level;
Particularly: to the physical-layer sub-channel of described symbol level, regard the sign resources of transmission as a dimension, referred to here as the symbol dimension, a plurality of bits in each symbol are regarded as another dimension, referred to here as the bit dimension.According to the requirement of the service quality of a plurality of business of required transmission, a plurality of symbols in the physical-layer sub-channel of symbol level are done as a whole, carry out further cutting apart of bit level, every part forms the physical-layer sub-channel of a bit level.Wherein, the physical-layer sub-channel of each bit level comprises one group of bit in symbol dimension and the bit dimension, and its input and output are bit.
Particularly, a plurality of symbols in the physical-layer sub-channel of symbol level are done as a whole, carried out cutting apart of bit level.For example need in the physical sub-channels of this symbol level, transmit two kinds of business, then need the physical-layer sub-channel of this symbol level is divided into the physical-layer sub-channel of two bit levels, a symbol comprises M bit, N symbol just comprises N*M bit, selectable partitioning scheme is a lot, has enriched the resource distribution mode of a plurality of professional transmission.Has the problem of kinds of protect degree owing to considered the bit in the same constellation symbol; can be in each bit of above-mentioned N*M; optimally select business of a part of bit transfer; other transmit another business; make the efficiency of transmission of a plurality of service transmission systems best; wherein M and N are integer, M〉1.
C, utilize a plurality of business information corresponding to physical-layer sub-channel transmission of described bit level.
The difference of the physical-layer sub-channel of bit level of the present invention and traditional physical-layer sub-channel: the physical-layer sub-channel of bit level of the present invention is physical layer channel to be cut apart based on the cascade of bit and symbol level obtain, and the least unit that namely forms the physical-layer sub-channel of bit level is the bit that the symbol space internal symbol carries; And traditional physical-layer sub-channel is to obtaining cutting apart of physical layer channel symbol-based level, and the least unit that namely forms physical-layer sub-channel is the symbol in the symbol space.
Present embodiment has been described the application of multi-service transmission in the transmission system of DVB-T2 standard criterion of described physical-layer sub-channel based on the bit level.Present embodiment is substantially the same manner as Example 1, and its difference only is following content.
The application scenarios of present embodiment is DVB-T2.In the DVB-T2 standard, utilize traditional physical-layer sub-channel technology, physical layer channel is cut apart at the symbol level, obtain physical layer pipe (PLP), be the physical-layer sub-channel of symbol level of the present invention, wherein the affiliated signal space of symbol is time domain and frequency domain.The division methods of concrete physical layer channel is prior art, can participate in pertinent literature, in this present invention this is not being given unnecessary details.
In the multi-service transmission, in order to show conventional physical subchannel technology and the lifting of traditional batch modulation technique on overall transmission efficiency of before DVB-T2 employing of a plurality of business transmitting method of the present invention, present embodiment has also provided the design parameter of a plurality of service transmission systems, specifically comprises:
1) a plurality of business and the quality of service requirement thereof of the required transmission of system: data transmission rate request is: professional 1:R
1=2 bit/symbol, professional 2:R
2=1 bit/symbol; Two kinds of minimum decoding thresholds of business differ 10dB, i.e. SNR
1-SNR
2=10dB.
2) modulation system of symbol all adopts 256 rank Gray QAM(Gray Quadrature Amplitude Modulation, Gray-QAM), constellation mapping is as shown in Figure 2.Each symbol carries 8 bits, has 4 kinds of error protection degree, the bit (b in each symbol
0~ b
7) corresponding channel capacity and Between Signal To Noise Ratio are as shown in Figure 3.
3) in the present embodiment, adopt in the method for the invention, only consider the situation of the physical-layer sub-channel of a symbol level of existence.Every P(P=24 in the physical-layer sub-channel of symbol level) individual symbol carries out cutting apart of bit level as a unit, and namely each unit comprises 8P=192 bit.We adopt the bit Choice to be: the data of choosing the best Q of a channel capacity bit transfer business 1, the data of the bit transfer business 2 of all the other 8P-Q, be called in the present embodiment allocation strategy 1, perhaps choose the data of the worst Q of a channel capacity bit transfer business 1, data with the bit transfer business 2 of the best 8P-Q of channel capacity are called allocation strategy 2 in the present embodiment.
4) adopt a plurality of business of conventional physical subchannel technical transmission to be described as: suppose to be split in the physical layer channel physical-layer sub-channel of two symbol levels, the physical-layer sub-channel of each symbol level is used for transmitting a kind of business.Be in the physical layer channel, ratio is the data of the symbol transmission business 1 of α (0＜α＜1), and ratio is the data of the symbol transmission business 2 of 1-α.
5) adopt the method that the traditional batch modulation technique is transmitted a plurality of business to be described as: to utilize N(0＜N in each constellation symbol＜8) data of individual bit transfer business 1, utilize the data of 8-N bit transfer business 2 in each symbol.
In the multi-service transmission, adopt multi-service transmission of the present invention, under various Bit Allocation in Discrete schemes (that is: different Q value), two kinds of business reach required transmission rate, and the minimum decoding threshold under two kinds of allocation strategies is as shown in Figure 4.The minimum decoding threshold here is the theoretical value that calculates by mutual information.According to the information theory of Shannon, the emission symbol of a communication system and the Average Mutual I (X between the receiving symbol; Y) be the maximum information transmission rate that this system can carry.Usually, mutual information I (X; Y) be the increasing function of signal to noise ratio (Signal to Noise Ratio, SNR), i.e. I (X; Y)=and f (SNR), therefore given transmission rate can be tried to achieve by above-mentioned relation the theoretical value of decoding threshold.Although this theoretical value will be higher than actual decoding threshold usually, it is convenient to calculate, and actual performance that still can the predict system.Therefore, hereinafter described minimum decoding threshold all is the decoding thresholds that calculate by mutual information.
Gap according to the minimum decoding threshold of two business requires (SNR again
A-SNR
B=10dB), determining the Bit Allocation in Discrete scheme, i.e. the concrete partitioning scheme of the physical-layer sub-channel of symbol level is so that the minimum decoding threshold that two kinds of business all reach given transmission rate is as much as possible little.The concrete partitioning scheme that obtains is as follows: utilize the data of the poorest bit transfer business 1 of 136 channel capacities, the data of the bit transfer business 2 that 56 channel capacities are best; In the physical-layer sub-channel of symbol level, the resource mapping figure of the physical-layer sub-channel of bit level as shown in Figure 5, dash area is to being applied to the system resource of transport service 2, other parts are to being applied to the system resource of transport service 1.
When utilizing two kinds of above-mentioned three kinds of methods transmission professional, under different schemes (being the value of every kind of method each self-optimizing Q, α, N), the minimum decoding threshold that system reaches required transfer rate as shown in Figure 6.As can be seen from the figure, multi-service transmission based on the physical-layer sub-channel based on the bit level of the present invention, under given quality of service requirement (being the signal-noise ratio threshold gap), the minimum decoding threshold of two kinds of business is the minimum decoding threshold when adopting conventional physical subchannel technology and adopting hierarchical modulation technology all.In addition, in multi-service transmission was used, the multi-service transmission of the physical sub-channels based on the bit level of the present invention also can provide abundant bit Resource Allocation Formula, can satisfy flexibly the requirement of the business of different transmission rate.
Present embodiment has been described the multi-service transmission of described physical sub-channels based on the bit level, a kind of based on the application in the transmission system of TDS-OFDM technology.Present embodiment is substantially the same manner as Example 1, and its difference only is following content.
The present embodiment application scenarios is a kind of transmission system based on the TDS-OFDM technology.In a kind of transmission system based on the TDS-OFDM technology, utilize conventional physical subchannel technology, physical layer channel is cut apart at the symbol level, obtained the physical-layer sub-channel of symbol level of the present invention, wherein the signal space under the symbol is time domain and frequency domain.The division methods of concrete physical layer channel is prior art, can participate in pertinent literature, in this present invention this is not being given unnecessary details.
In the multi-service transmission is used, for the multi-service transmission that shows the physical-layer sub-channel based on the bit level of the present invention than front traditional physical-layer sub-channel technology and the lifting of hierarchical modulation technology on overall transmission efficiency, present embodiment has also provided the design parameter of a plurality of service transmission systems, specifically comprises:
1) a plurality of business and the quality of service requirement thereof of the required transmission of system: professional 1: minimum decoding threshold is 15dB; Professional 2: minimum decoding threshold is 5dB; The message transmission rate ratio R of two kinds of business
1: R
2=2:1.
2) modulation system of symbol all adopts 256 rank Gray-APSK.Wherein, the exponent number of described Gray-APSK planisphere is M=2
m, the n that counts on each ring
lEquate and
Number of rings
M=m wherein
1+ m
2, m
1, m
2Be positive integer with m.Described 256 rank Gray-APSK planispheres as shown in Figure 7, mapping mode is prior art, in this present invention this is not being given unnecessary details, each symbol carries 8 bits, has 8 kinds of error protection degree, the bit (b in each symbol
0~ b
7) corresponding channel capacity and Between Signal To Noise Ratio are as shown in Figure 8.
3) in the present embodiment, adopt in the method for the invention, only consider that physical layer channel only comprises the situation of the physical-layer sub-channel of a symbol level.Every P(P=24 in the physical-layer sub-channel of symbol level) individual symbol carries out cutting apart of bit level as a unit, and namely each unit comprises 8P=192 bit.We adopt the bit Choice to be: the data of choosing the best Q of a channel capacity bit transfer business 1, the data of the bit transfer business 2 of all the other 8P-Q, be called in the present embodiment allocation strategy 1, perhaps choose the data of the worst Q of a channel capacity bit transfer business 1, data with the bit transfer business 2 of the best 8P-Q of channel capacity are called allocation strategy 2 in the present embodiment.
4) adopt the method for a plurality of business of conventional physical subchannel technical transmission to be described as: suppose to be split in the physical layer channel physical-layer sub-channel of two symbol levels, the physical-layer sub-channel of each symbol level is used for transmitting a kind of business.Be in the physical layer channel, ratio is the data of the symbol transmission business 1 of α (0＜α＜1), and ratio is the data of the symbol transmission business 2 of 1-α.
5) adopt the method that hierarchical modulation technology transmits a plurality of business to be described as: to utilize N(0＜N in each constellation symbol＜8) data of individual bit transfer business 1, utilize the data of 8-N bit transfer business 2 in each symbol.
Adopt the multi-service transmission of the physical-layer sub-channel based on the bit level of the present invention, under the various Bit Allocation in Discrete schemes, the transmission rate of two kinds of business under given minimum decoding threshold as shown in Figure 9.Again according to the ratio (R of the transfer rate of two business
1: R
2=2:1), can draw the Bit Allocation in Discrete schemes of two kinds of professional transmission, i.e. the concrete partitioning scheme of the physical-layer sub-channel of symbol level is so that the transfer rate of two kinds of business is large as much as possible under given signal to noise ratio.The concrete partitioning scheme that obtains: utilize the data of the poorest bit transfer business 1 of 125 channel capacities, the data of the bit transfer business 2 that 67 channel capacities are best; In the physical-layer sub-channel of symbol level, the resource mapping figure of the physical-layer sub-channel of each bit level as shown in figure 10, dash area is to being applied to the system resource of transport service 2, other are to being applied to the system resource of transport service 1.
When utilizing two kinds of above-mentioned three kinds of methods transmission professional, under given decoding threshold, when adopting different scheme (being the value of every kind of method each self-optimizing Q, α, N), the data transmission rate that two kinds of business reach as shown in figure 11.As shown in the figure, when the minimum decoding threshold of given two kinds of business is respectively 15dB and 5dB, the data transmission rate ratio R of two kinds of business
1: R
2=2:1.Can find out, multi-service transmission based on the physical-layer sub-channel based on the bit level of the present invention, under given quality of service requirement (being decoding threshold), the data transmission rate of two kinds of business is the data transmission rate when adopting conventional physical subchannel technology and adopting hierarchical modulation technology all.
Above execution mode only is used for explanation the present invention; and be not limitation of the present invention; the those of ordinary skill in relevant technologies field; in the situation that does not break away from the spirit and scope of the present invention; can also make a variety of changes and modification; therefore all technical schemes that are equal to also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.
Claims (7)
1. the multi-service transmission based on the physical-layer sub-channel of bit level is characterized in that, described method comprises:
A, according to the quality of service requirement of a plurality of business of required transmission, physical layer channel is cut apart at the symbol level, obtain the physical-layer sub-channel of symbol level;
B, according to the quality of service requirement of a plurality of business of described required transmission, the physical-layer sub-channel of described symbol level is cut apart at the bit level, obtain the physical-layer sub-channel of bit level;
C, utilize a plurality of business information corresponding to physical-layer sub-channel transmission of described bit level.
2. method according to claim 1 is characterized in that, specifically comprises in the steps A: according to the quality of service requirement of a plurality of business of described required transmission, be α with ratio in the physical layer channel
iSymbol be attributed to the physical-layer sub-channel of a symbol level, wherein α
1+ α
2+ ...+α
N=1,0＜α
i＜1,1≤i≤N.
3. method according to claim 2 is characterized in that, the signal space under the described symbol is one or more in time domain, frequency domain, spatial domain or the code territory.
4. method according to claim 3 is characterized in that, the physical-layer sub-channel of each described symbol level comprises a part of symbol of described physical layer channel in the steps A;
Or,
The physical-layer sub-channel of each described symbol level comprises whole symbols of described physical layer channel.
5. method according to claim 1 is characterized in that, the quality of service requirement of a plurality of business of required transmission described in the steps A comprises professional quantity, the message transmission rate of business and required minimum decoding threshold.
6. method according to claim 1, it is characterized in that, step B specifically comprises: according to the requirement of the service quality of a plurality of business of described required transmission, do a plurality of symbols in the physical-layer sub-channel of described symbol level as a whole, carry out further cutting apart of bit level, cut apart the physical-layer sub-channel that the every part that obtains forms a bit level.
7. method according to claim 6 is characterized in that, the physical-layer sub-channel of each described bit level comprises a part of bit of the physical-layer sub-channel of described symbol level;
Or,
The physical-layer sub-channel of each described bit level comprises whole bits of the physical-layer sub-channel of described symbol level.
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| CN105940650A (en) * | 2014-01-28 | 2016-09-14 | 华为技术有限公司 | Indication method of data transmission, access point and terminal |
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