CN112332948B - Multi-service transmission sending and receiving method, system, medium and device - Google Patents
Multi-service transmission sending and receiving method, system, medium and device Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0057—Block codes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0071—Use of interleaving
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/36—Modulator circuits; Transmitter circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/38—Demodulator circuits; Receiver circuits
Abstract
The invention provides a method, a system, a medium and a device for transmitting, sending and receiving multi-service transmission, comprising the following steps: generating a first symbol sequence with the length of D by carrying out channel coding, interleaving and modulation on a generated mobile service information bit sequence, generating a symbol sequence with the length of Q by carrying out channel coding, interleaving and modulation on a generated fixed service information bit sequence, generating a third symbol sequence for the symbol sequence with the length of Q according to a punching rule, combining the first symbol sequence and the second symbol sequence to generate a first LDM symbol sequence, carrying out frequency domain multiplexing on the first LDM symbol sequence and the third symbol sequence to output a fourth symbol sequence, carrying out point discrete Fourier inverse transformation on the fourth symbol sequence to output a fifth data sequence, and adding a protection interval to the fifth data sequence to obtain a data signal. The present invention is used to improve the reception characteristics of the EL layer fixed services without degrading the reception performance of the CL layer mobile services of the LDM.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method, a system, a medium, and an apparatus for transmitting and receiving multiple services.
Background
In recent years, next generation DTTB (terrestrial digital television broadcasting) supporting Ultra High Definition Television (UHDTV) has become one of the international hot research issues. With the rapid development of terrestrial broadcasting services, the frequency spectrum of the broadcasting frequency band gradually becomes a scarce resource, and efficient and flexible frequency spectrum use is very important. The newly proposed Layer Division Multiplexing (LDM) technology not only can realize efficient multi-service delivery, but also has higher spectral efficiency. The performance advantages of LDM were verified by extensive simulations of the ATSC (advanced television systems committee) 3.0 system. In a typical scenario of LDM usage, a Core Layer (CL) is used to provide mobile received High Definition TV (HDTV) service and an Enhancement Layer (EL) is used to provide fixed received 4K Ultra High Definition TV (UHDTV) service. To date, little research has been done in the literature regarding the improvement in performance of the EL of LDM. The prior art researches an interference elimination method of CL to EL, and can improve the performance of EL. However, it is considered that the EL and CL of the LDM carry the same service. Methods for improving EL performance under different services are discussed. In addition, for the EL layer power increase by simply changing the LDM power Injection Level (IL), although the reception performance of the fixed service can be improved, the reception threshold of the CL layer mobile reception service is also affected.
Therefore, it is desirable to solve the problem of how to improve the reception characteristics of the EL layer fixed traffic without degrading the reception performance of the CL layer mobile traffic of the LDM.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a multi-service transmission/reception method, system, medium and apparatus, which are used to solve the problem of how to improve the reception characteristics of the EL layer fixed service without reducing the reception performance of the CL layer mobile service of the LDM in the prior art.
In order to achieve the above and other related objects, the present invention provides a method for transmitting multiple services, including the following steps: generating mobile service information bit sequence as { B based on mobile service information bit generation device M (b),b＝0,1,2,...,N Mbit -1}; mobile service information bit sequence B M (b),b＝0,1,2,...,N Mbit -1 as input, a first symbol sequence { X } of length D is generated by channel coding, bit interleaving and modulation based on a first bit interleaved coded modulation means M (d) D =0,1,2,. D-1}; generating a fixed service information bit sequence of { B } based on a fixed service information bit generation means F (e),e＝0,1,2,...,N Fbit -1}; fixing the service information bit sequence B F (e),e＝0,1,2,...,N Fbit -1 as input, a sequence of code symbols of length Q { X ] is generated by channel coding, bit interleaving and modulation based on a second bit interleaved coded modulation means F (Q), Q =0,1,2,.., Q-1}; for the code symbol sequence { X F (Q), Q =0,1,2,.., Q-1} puncturing with a symbol puncturing device according to a puncturing rule; the puncturing rule is that the puncturing rate is v, and a second symbol sequence with the length of D is left after puncturing { X F1 (d) D =0,1,2,., D-1}, and puncturing to extract a third symbol sequence { X > of length K F2 (k) K =0,1,2, ·, K-1}, wherein the puncturing rate v satisfies the relationship v = (Q-D)/Q; based on LDM merging device, the first symbol sequence with length D is coded by the first code sequence X M (d),d＝0,1,2,...D-1 and a second symbol sequence of length D { X } F1 (d) D =0,1, 2.,. D-1} is combined to generate a first LDM symbol sequence that is { X } L (d) D =0,1, 2.., D-1}, which is calculated as X L (d)＝X M (d)+g·X F1 (d) D =0,1,2,. Ang, D-1, where g is the LDM lower layer signal power injection ratio; multiplexing the first LDM symbol sequence { X ] based on data symbols L (d) D =0,1, 2.,. D-1} and a third symbol sequence { X } F2 (k) K =0,1, 2.,. K-1} frequency domain multiplexing outputs a fourth symbol sequence { X } m (l),l＝0,1,...,N F -1}; IDFT transform device-based on the fourth symbol sequence { X } m (l),l＝0,1,...,N F -1} doing N F And performing point inverse discrete Fourier transform, and recording an output fifth data sequence as { x m (i),i＝0,1,...,N F -1}; notation { x ] for the fifth data sequence based on the add cyclic prefix device m (i),i＝0,1,...,N F -1} adding a guard interval with a preset length at the head or tail of the data signal to eliminate the intersymbol interference caused by the channel, thereby obtaining the data signal.
In an embodiment of the present invention, the mobile service information bit sequence { B } M (b),b＝0,1,2,...,N Mbit -1 as input, a first symbol sequence { X ] of length D is generated by channel coding, bit interleaving and modulation based on a first bit interleaved coded modulation means M (d) D =0,1,2,., D-1} includes: based on channel coding device to said mobile service information bit sequence { B M (b),b＝0,1,2,...,N Mbit -1, channel coding to obtain coded sequence B P (p),p＝0,1,2,...,N CO -1}, wherein N CO The sequence length after coding is the mobile service information bit sequence; based on interleaving device to said code sequence { B P (p),p＝0,1,2,...,N CO -1, to obtain an interleaved bit sequence { B } J (j),j＝0,1,2,...,N CO -1}; based on constellation mapping device to the interleaved bit sequence { B J (j),j＝0,1,2,...,N CO -1 constellation mapping to obtain a first symbol sequence { X ] of length D M (d),d＝0,1,2,...,D-1}。
In an embodiment of the present invention, the frequency domain multiplexing formula is
Wherein N is F ＝N+K。
In order to achieve the above object, the present invention further provides a multi-service transmission and transmission system, including: mobile service information bit generating device, first bit interleaving code modulation device, fixed service information bit generating device, second bit interleaving code modulation device, symbol punching device, LDM merging device, data symbol multiplexing device, IDFT conversion device and cyclic prefix adding device; the mobile service information bit generation device is used for generating the mobile service information bit sequence as { B } M (b),b＝0,1,2,...,N Mbit -1}; mobile service information bit sequence B M (b),b＝0,1,2,...,N Mbit -1 as input, said first bit-interleaved coded modulation means being adapted to generate a first sequence of symbols of length D { X } after channel coding, bit interleaving and modulation M (d) D =0,1,2,. 1, D-1}; the fixed service information bit generating device is used for generating a fixed service information bit sequence of { B } F (e),e＝0,1,2,...,N Fbit -1}; fixing the service information bit sequence B F (e),e＝0,1,2,...,N Fbit -1 as input, said second bit-interleaved coded modulation means being arranged to generate a sequence of code symbols of length Q { X over channel coding, bit interleaving and modulation F (Q), Q =0,1,2, ·, Q-1}; the symbol puncturing means is for puncturing the coded symbol sequence { X } F (Q), Q =0,1,2,.., Q-1} punching according to a punching rule; the puncturing rule is that the puncturing rate is v, and a second symbol sequence { X with the length of D is left after puncturing F1 (d) D =0,1,2,., D-1}, and puncturing to extract a third symbol sequence { X > of length K F2 (k) K =0,1,2, ·, K-1}, wherein the puncturing rate v satisfies the relationship v = (Q-D)/Q; the LDM merging device is used for a first symbol sequence { X with the length of D M (d) D =0,1, 2.,. D-1} and a second symbol sequence of length D { X } F1 (d) D =0,1, 2.,. D-1} are combined to generate a first LDM symbol sequenceThe first LDM symbol sequence is { X L (d) D =0,1, 2.., D-1}, which is calculated as X L (d)＝X M (d)+g·X F1 (d) D =0,1, 2., D-1, where g is the LDM lower layer signal power injection ratio; the data symbol multiplexing device is used for the first LDM symbol sequence { X L (d) D =0,1,2,. Ang, D-1} and a third symbol sequence { X } F2 (k) K =0,1, 2.,. K-1} frequency domain multiplexing outputs a fourth symbol sequence { X } m (l),l＝0,1,...,N F -1}; the IDFT transform device is used for the fourth symbol sequence { X m (l),l＝0,1,...,N F -1} doing N F And performing point inverse discrete Fourier transform, and recording an output fifth data sequence as { x m (i),i＝0,1,...,N F -1}; the cyclic prefix adding device is used for recording the fifth data sequence as { x m (i),i＝0,1,...,N F -1, adding a guard interval with a preset length at the head or the tail of the channel to eliminate the inter-symbol interference caused by the channel, and obtaining a data signal.
In an embodiment of the present invention, the data signal is received based on a guard interval removal apparatus, and the data signal is recorded as { r (t), t =0,1 F + C-1, removing the guard interval with the length of C to obtain the guard interval with the length of N F Of received signal sequence y m (l),l＝0,1,...,N F -1}; based on DFT conversion device to the received signal sequence y m (l),l＝0,1,...,N F -1} doing N F Point discrete Fourier transform, outputting a first data sequence { Y } m (i),i＝0,1,...,N F -1}; recording { Y } for the first data sequence based on a channel equalization device m (i),i＝0,1,...,N F -1, performing a channel equalization operation to obtain an equalized symbol sequence { E } m (i),i＝0,1,2,...,N F -1}; symbol multiplexing removal device based on the equalized symbol sequence { E m (i),i＝0,1,2,...,N F -1} recording the LDM symbol position extracted data as a sequence of LDM symbols
The non-LDM symbol position extraction data is marked as a non-LDM symbol sequence { X } F2 (d),d＝0,1,2,...,K-1}；Based on bit interleaving code modulation decoding device to the LDM symbol sequence
Demapping, deinterleaving and decoding to generate estimated value of information bit sequence of mobile service
Wherein the estimated value
Input a first bit interleaving code modulation device to obtain
Separation device pair based on LDM
And
calculated by LDM separation formula
Based on symbol punching recovery device to the LDM symbol sequence
And non-LDM symbol sequences
Recovering according to the punching rule to obtain the estimated value of the pre-punching sequence
Bit interleaving coding modulation decoding device based estimation value of pre-punching sequence
After demapping, deinterleaving and decoding, the length N is generated Fbit Information of fixed servicesEstimation of a bit sequence
In an embodiment of the invention, the bit-interleaving-based coded modulation decoding apparatus performs decoding on the LDM symbol sequence
Demapping, deinterleaving and decoding to generate estimated value of information bit sequence of mobile service
Wherein the estimated value
Input a first bit interleaving code modulation device to obtain
The method comprises the following steps: mapping device is based on constellation and is used for mapping the LDM symbol sequence
Constellation demapping is carried out to obtain an external information sequence { L J (j),j＝0,1,2,...,N CO -1}, wherein N CO Is the length of the coding sequence; based on the deinterleaving device to the external information sequence { L J (j),j＝0,1,2,...,N CO -1, obtaining a deinterleaved sequence { L } P (p),p＝0,1,2,...,N CO -1}; the de-interleaved sequence { L } is decoded based on a decoding device P (p),p＝0,1,2,...,N CO -1, and obtaining the mobile service information bit sequence as B M (b),b＝0,1,2,...,N Mbit -1}。
The invention also provides a multi-service transmission and transmission system, which comprises: guard interval removing device, DFT converting device, channel equalizing device, symbol multiplexing removing device, first bit interleaving code modulation decoding device, LDM separating device, symbol puncturing restoring device and second bit interleaving code modulation decoding device(ii) a The guard interval removal device is used for receiving a data signal, and the data signal is recorded as { r (t), t =0,1 F + C-1, removing the guard interval with the length of C to obtain the guard interval with the length of N F Of received signal sequence y m (l),l＝0,1,...,N F -1}; the DFT transform device is used for receiving the received signal sequence y m (l),l＝0,1,...,N F -1} is given as N F Performing point discrete Fourier transform to output a first data sequence of Y m (i),i＝0,1,...,N F -1}; the channel equalization device is used for recording { Y ] to the first data sequence m (i),i＝0,1,...,N F -1, performing a channel equalization operation to obtain an equalized symbol sequence { E } m (i),i＝0,1,2,...,N F -1}; the symbol multiplexing and removing device is used for the equalized symbol sequence { E m (i),i＝0,1,2,...,N F -1} recording the LDM symbol position extracted data as a sequence of LDM symbols
The non-LDM symbol position extraction data is marked as a non-LDM symbol sequence { X } F2 (d) D =0,1,2,. K-1}; the first bit interleaving code modulation decoding device is used for the LDM symbol sequence
Method for generating estimated value of information bit sequence of mobile service through demapping, deinterleaving and decoding
Wherein the estimated value
Input a first bit interleaving code modulation device to obtain
The LDM separation device is used for the pair
And
calculated by LDM separation formula
The symbol punching and recovering device is used for the LDM symbol sequence
And non-LDM symbol sequences
Recovering according to the punching rule to obtain the estimated value of the pre-punching sequence
The second bit interleaving code modulation decoding device is used for estimating the pre-puncturing sequence
After demapping, deinterleaving and decoding, the length N is generated Fbit Estimate of the information bit sequence of the fixed service
To achieve the above object, the present invention further provides a computer-readable storage medium, on which a computer program is stored, which, when executed by a processor, implements any of the above methods for transmitting and receiving multiple services.
In order to achieve the above object, the present invention further provides a multi-service transmission and transmission apparatus, including: a processor and a memory; the memory is used for storing a computer program; the processor is connected to the memory and configured to execute the computer program stored in the memory, so that the multi-service transmission and transmission apparatus executes any one of the above multi-service transmission and transmission methods.
Finally, the invention also provides a multi-service transmission, transmission and reception system, which comprises: transmission delivery including multiple servicesThe device and the multi-service transmission and receiving device; the multi-service transmission and receiving device is used for receiving a data signal based on a guard interval removing device, and the data signal is recorded as { r (t), t =0,1 F + C-1, removing the guard interval with the length of C to obtain the guard interval with the length of N F Of received signal sequence y m (l),l＝0,1,...,N F -1}; based on DFT conversion device to the received signal sequence y m (l),l＝0,1,...,N F -1} doing N F Point discrete Fourier transform, outputting a first data sequence { Y } m (i),i＝0,1,...,N F -1}; -assigning { Y to said first data sequence based on a channel equalization means m (i),i＝0,1,...,N F -1, performing a channel equalization operation to obtain an equalized symbol sequence { E } m (i),i＝0,1,2,...,N F -1}; removing the equalized symbol sequence { E) based on symbol multiplexing m (i),i＝0,1,2,...,N F -1} the LDM symbol position extracted data is recorded as LDM symbol sequence
The non-LDM symbol position extraction data is recorded as a non-LDM symbol sequence { X F2 (d) D =0,1,2,. K-1}; the LDM symbol sequence is coded, modulated and decoded by a bit interleaving-based coding and decoding device
Demapping, deinterleaving and decoding to generate estimated value of information bit sequence of mobile service
Wherein the estimated value
Input a first bit interleaving code modulation device to obtain
LDM-based separation device pair
And
calculated by LDM separation formula
Based on symbol punching recovery device to LDM symbol sequence
And non-LDM symbol sequences
Recovering according to the punching rule to obtain the estimated value of the pre-punching sequence
Bit interleaving coding modulation decoding device based estimation value of pre-punching sequence
After demapping, deinterleaving and decoding, the length N is generated Fbit Estimate of the information bit sequence of the fixed service
As described above, the transmission, reception method, system, medium, and apparatus for multiple services according to the present invention have the following advantages: for improving the reception characteristics of the EL layer fixed traffic without degrading the reception performance of the CL layer mobile traffic of the LDM.
Drawings
FIG. 1a is a flow chart of a method for multi-service transmission of the present invention in one embodiment;
fig. 1b is a schematic diagram illustrating an equally spaced puncturing in an embodiment of a method for transmitting multiple services according to the present invention;
fig. 1c is a schematic diagram illustrating non-equidistant puncturing in an embodiment of a method for transmitting multiple services according to the present invention;
fig. 1d is a schematic structural diagram of a multi-service transmission system according to an embodiment of the present invention;
fig. 2a is a flowchart of a method for multi-service transmission and reception according to an embodiment of the present invention;
FIG. 2b is a schematic diagram illustrating an embodiment of a multi-service transmission/reception system of the present invention;
fig. 3 is a schematic structural diagram of a multi-service transmission transmitting apparatus according to an embodiment of the present invention;
FIG. 4a is a schematic block diagram illustrating a multi-service transmission/reception system according to an embodiment of the present invention;
FIG. 4b is a diagram illustrating the performance of a multi-service transmission/reception system according to an embodiment of the present invention;
fig. 4c is a performance diagram of a multi-service transmission/reception system according to another embodiment of the present invention.
Description of the element reference
101. Mobile service information bit generating device
102. First bit interleaving code modulation device
103. Fixed service information bit generation device
104. Second bit interleaving code modulation device
105. Symbol punching device
106 LDM merging device
107. Data symbol multiplexing device
108 IDFT conversion device
109. Device for adding cyclic prefix
200. Guard interval removing device
201 DFT conversion device
202. Channel equalization device
203. Symbol multiplexing removal apparatus
204. First bit interleaving code modulation decoding device
205. First buffer memory device
206. Second buffer device
207 LDM separator
208. Symbol puncturing and recovering apparatus
209. Second bit interleaving code modulation decoding device
31. Processor with a memory having a plurality of memory cells
32. Memory device
41. Multi-service transmission and sending device
42. Multi-service transmission and receiving device
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and therefore, the drawings only show the components related to the present invention rather than the number, shape and size of the components in actual implementation, and the type, amount and ratio of the components in actual implementation may be changed arbitrarily, and the layout of the components may be complicated.
The invention provides a method, a system, a medium and a device for transmitting and receiving multi-service, which can improve the receiving characteristic of the fixed service of an EL layer under the condition of not reducing the receiving performance of the CL layer mobile service of an LDM. The SNR threshold value required by the reception of the fixed service can be effectively improved, and even the performance of the mobile service carried by the CL layer can be improved under the condition that the power injection level of the LDM-EL layer is lower.
As shown in fig. 1a, in an embodiment, the method for transmitting and receiving multiple services of the present invention includes the following steps:
step S11And generating a mobile service information bit sequence of { B ] based on the mobile service information bit generation means M (b),b＝0,1,2,...,N Mbit -1}。
Specifically, when a plurality of data blocks are transmitted, the following procedure may be repeated. Suppose an information data block consists of N Mbit An information bit component, which can be expressed as { B } M (b),b＝0,1,2,...,N Mbit -1}。
Step S12, the mobile service information bit sequence { B } M (b),b＝0,1,2,...,N Mbit -1 as input, a first symbol sequence { X ] of length D is generated by channel coding, bit interleaving and modulation based on a first bit interleaved coded modulation means M (d),d＝0,1,2,...,D-1}。
Specifically, the mobile service information bit sequence { B } M (b),b＝0,1,2,...,N Mbit -1 as input, a first symbol sequence { X ] of length D is generated by channel coding, bit interleaving and modulation based on a first bit interleaved coded modulation means M (d) D =0,1,2,., D-1} includes: based on channel coding device to said mobile service information bit sequence { B M (b),b＝0,1,2,...,N Mbit -1, obtaining coded sequence { B ] through channel coding P (p),p＝0,1,2,...,N CO -1}, wherein N CO The sequence length of the coded mobile service information bit sequence is obtained; the channel coding adopted by the channel coding device comprises: polar code, LDPC code, turbo code, or the like. Based on interleaving device to said code sequence { B P (p),p＝0,1,2,...,N CO -1, interleaving to obtain an interleaved bit sequence { B } J (j),j＝0,1,2,...,N CO -1}; based on constellation mapping device to said interleaved bit sequence { B J (j),j＝0,1,2,...,N CO -1 constellation mapping to obtain a first symbol sequence { X ] of length D M (d) D =0,1,2,. 1, D-1}; the constellation mapping adopted by the constellation mapping device comprises: QAM (Quadrature Amplitude Modulation): quadrature amplitude modulation or PSK (phase shift keying), etc. The interleaving process is interleaving coding, the interleaving coding aims to disperse a longer burst error into a random error and then correct the random errorRandom error coding (FEC) techniques eliminate random errors. The larger the interleaving depth, the greater the dispersion and the stronger the burst error resistance. However, the larger the interleaving depth, the longer the interleaving encoding processing time, which results in the increase of data transmission delay, that is, the interleaving encoding is at the cost of time. Therefore, the interleaved coding belongs to time implicit diversity. Fading in an actual mobile communication environment will cause burst errors in digital signal transmission. Such burst errors can be dispersed and corrected using an interleaving coding technique, improving the transmission characteristics of mobile communications.
Step S13, based on the fixed service information bit generation device, generating the fixed service information bit sequence as { B } F (e),e＝0,1,2,...,N Fbit -1}。
Step S14, fixing service information bit sequence { B } F (e),e＝0,1,2,...,N Fbit -1 as input, a sequence of code symbols { X ] of length Q is generated by channel coding, bit interleaving and modulation based on a second bit interleaved coded modulation means F (q),q＝0,1,2,...,Q-1}。
Specifically, the channel coding, bit interleaving and modulation are the same as the processing method in step S12 and are not described herein again.
Step S15, encoding the code symbol sequence { X F (Q), Q =0,1, 2.., Q-1} drilling using a symbol drilling apparatus according to a drilling rule; the puncturing rule is that the puncturing rate is v, and a second symbol sequence with the length of D is left after puncturing { X F1 (d) D =0,1,2,., D-1}, and puncturing to extract a third symbol sequence { X > of length K F2 (k) K =0,1, 2., K-1}, wherein the puncturing rate v satisfies the relationship v = (Q-D)/Q.
Wherein Q is the length of the coding symbol sequence and D is the length of the second symbol sequence.
The symbol puncturing device is used to perform equal interval puncturing according to the puncturing rule as shown in fig. 1b, and the symbol puncturing device is used to perform unequal interval puncturing according to the puncturing rule as shown in fig. 1c.
Step S16, based on LDM merging device, the first symbol sequence { X with length D M (d) D =0,1, 2.,. D-1} and a length D of the second orderTwo symbol sequence { X F1 (d) D =0,1, 2.,. D-1} is combined to generate a first LDM symbol sequence of { X } L (d) D =0,1, 2.., D-1}, which is calculated as X L (d)＝X M (d)+g·X F1 (d) D =0,1,2,. Ang, D-1, where g is the LDM lower layer signal power injection ratio.
Step S17, based on the data symbol multiplexing device, the first LDM symbol sequence { X } L (d) D =0,1,2,. Ang, D-1} and a third symbol sequence { X } F2 (k) K =0,1, 2.,. K-1} frequency domain multiplexing outputs a fourth symbol sequence { X } m (l),l＝0,1,...,N F -1}。
Specifically, the frequency domain multiplexing formula is
Wherein N is F ＝D+K；
Step S18, based on IDFT transformation device, of the fourth symbol sequence { X m (l),l＝0,1,...,N F -1} doing N F And performing inverse point discrete Fourier transform, and recording the output fifth data sequence as { x m (i),i＝0,1,...,N F -1}。
In particular, wherein N F The inverse point discrete Fourier transform formula is
i＝0,1,2,...,N F -1, j is the root minus one, i.e. an imaginary number. Discrete Fourier Transform (DFT) and Inverse DFT (IDFT) are used.
Step S19, recording the fifth data sequence as { x ] based on the device for adding the cyclic prefix m (i),i＝0,1,...,N F -1, adding a guard interval with a preset length at the head or the tail of the channel to eliminate the intersymbol interference caused by the channel, and obtaining a data signal.
Specifically, the symbol sequence { x after IDFT conversion by IDFT conversion means m (i),i＝0,1,...,N F -1} adding a guard interval of a specific length to the head or tail of the channel to eliminate the intersymbol interference caused by the channel, specifically addingThe manner of addition is not limited. A data symbol is formed after the guard interval adding means as s (t), t =0,1 F + C-1, where C is the guard interval length.
As shown in fig. 1d, in one embodiment, the multi-service transmission and transmission system of the present invention includes a mobile service information bit generation device 101, a first bit interleaving code modulation device 102, a fixed service information bit generation device 103, a second bit interleaving code modulation device 104, a symbol puncturing device 105, an LDM combining device 106, a data symbol multiplexing device 107, an IDFT conversion device 108, and a cyclic prefix adding device 109.
The mobile service information bit generation means 101 is used to generate a mobile service information bit sequence of { B } M (b),b＝0,1,2,...,N Mbit -1}；
Mobile service information bit sequence B M (b),b＝0,1,2,...,N Mbit -1 as input, said first bit-interleaved coded modulation means 102 being adapted to generate a first sequence of symbols of length D { X ] via channel coding, bit interleaving and modulation M (d),d＝0,1,2,...,D-1}；
The fixed service information bit generation means 103 is used to generate a fixed service information bit sequence of { B } F (e),e＝0,1,2,...,N Fbit -1}；
Fixing the service information bit sequence B F (e),e＝0,1,2,...,N Fbit -1 as input, said second bit-interleaved coded modulation means 104 being adapted to generate a sequence of coded symbols of length Q { X } after channel coding, bit interleaving and modulation F (q),q＝0,1,2,...,Q-1}；
The symbol puncturing means 105 is arranged to puncture the coded symbol sequence { X } F (Q), Q =0,1,2,.., Q-1} punching according to a punching rule; the puncturing rule is that the puncturing rate is v, and a second symbol sequence with the length of D is left after puncturing { X F1 (d) D =0,1,2,., D-1}, and puncturing to extract a third symbol sequence { X > of length K F2 (k) K =0,1,2,. K-1}, wherein the puncturing rate v satisfies the relationship v = (Q-D)/Q;
the LDM merging device 106 is used for length matchingFirst symbol sequence { X) of D M (d) D =0,1, 2.,. D-1} and a second symbol sequence of length D { X } F1 (d) D =0,1, 2.,. D-1} is combined to generate a first LDM symbol sequence of { X } L (d) D =0,1,2, 1, D-1, calculated as X L (d)＝X M (d)+g·X F1 (d) D =0,1,2,. Ang, D-1, where g is the LDM lower layer signal power injection ratio;
the data symbol multiplexing device 107 is used for the first LDM symbol sequence { X L (d) D =0,1, 2.,. D-1} and a third symbol sequence { X } F2 (k) K =0,1,2,.., K-1} is frequency domain multiplexed to output a fourth symbol sequence { X } m (l),l＝0,1,...,N F -1}; wherein the frequency domain multiplexing formula is
Wherein N is F ＝D+K；
The IDFT transform device 108 is used for the fourth symbol sequence { X } m (l),l＝0,1,...,N F -1} doing N F The fifth data sequence output by the inverse point-spread Fourier transform is marked as { x m (i),i＝0,1,...,N F -1}; said N is F The inverse point discrete Fourier transform formula is
The cyclic prefix adding device 109 is configured to mark the fifth data sequence as { x m (i),i＝0,1,...,N F -1} adding a guard interval with a preset length at the head or tail of the data signal to eliminate the intersymbol interference caused by the channel, thereby obtaining the data signal. It should be noted that the structures and principles of the mobile service information bit generating device 101, the first bit interleaving code modulation device 102, the fixed service information bit generating device 103, the second bit interleaving code modulation device 104, the symbol puncturing device 105, the LDM combining device 106, the data symbol multiplexing device 107, the IDFT conversion device 108, and the cyclic prefix adding device 109 correspond to the steps in the transmission and transmission method for multiple services one by one, and therefore, no further description is given here.
It should be noted that the division of the devices in the above system is only a logical division, and the actual implementation may be wholly or partially integrated into one physical entity or may be physically separated. And these means can all be implemented in the form of software invoked by a processing element; or can be implemented in the form of hardware; part of the device can be realized in the form of calling software by the processing element, and part of the device can be realized in the form of hardware. For example, the x device may be a processing element separately set up, or may be integrated into a chip of the above device, or may be stored in a memory of the above device in the form of program code, and the above function of the x device is called and executed by a processing element of the above device. Other devices are implemented similarly. In addition, all or part of the devices can be integrated together or can be independently realized. The processing element described herein may be an integrated circuit having signal processing capabilities. In the implementation, each step of the above method or each device above may be implemented by an integrated logic circuit of hardware in a processor element or an instruction in the form of software.
For example, the above apparatus may be one or more integrated circuits configured to implement the above methods, such as: one or more Application Specific Integrated Circuits (ASICs), or one or more Microprocessors (MPUs), or one or more Field Programmable Gate Arrays (FPGAs), etc. For another example, when one of the above devices is implemented in the form of a Processing element scheduler code, the Processing element may be a general-purpose processor, such as a Central Processing Unit (CPU) or other processor capable of calling program code. As another example, these devices may be integrated together and implemented in the form of a system-on-a-chip (SOC).
As shown in fig. 2a, in an embodiment, the method for transmitting and receiving multiple services of the present invention includes the following steps:
step S21, based on the guard intervalThe removal device receives a data signal, noting that the data signal is { r (t), t =0,1 F + C-1, removing the guard interval with the length of C to obtain the guard interval with the length of N F Of received signal sequence y m (l),l＝0,1,...,N F -1}。
Step S22, based on DFT transformation device, for the received signal sequence { y } m (l),l＝0,1,...,N F -1} doing N F Point discrete Fourier transform, outputting a first data sequence { Y } m (i),i＝0,1,...,N F -1}。
Specifically, the formula of the point discrete fourier transform is as follows:
step S23, recording { Y ] for the first data sequence based on the channel equalization device m (i),i＝0,1,...,N F -1, performing a channel equalization operation to obtain an equalized symbol sequence { E } m (i),i＝0,1,2,...,N F -1}。
In particular, the channel equalization operation is a time domain or frequency domain equalization method.
Step S24, based on the symbol multiplexing removing device, the equalized symbol sequence { E m (i),i＝0,1,2,...,N F -1} the LDM symbol position extracted data is recorded as LDM symbol sequence
The non-LDM symbol position extraction data is recorded as a non-LDM symbol sequence { X } F2 (d),d＝0,1,2,...,K-1}。
Step S25, based on bit interleaving coding modulation decoding device to said LDM symbol sequence
Method for generating estimated value of information bit sequence of mobile service through demapping, deinterleaving and decoding
Wherein the estimated value
Input a first bit interleaving code modulation device to obtain
Specifically, the LDM symbol sequence is coded and modulated by the bit-based interleaving code and modulation decoding device
Demapping, deinterleaving and decoding to generate estimated value of information bit sequence of mobile service
Wherein the estimated value
Input first bit interleaving code modulation device to obtain
The method comprises the following steps: mapping device is based on constellation and is used for mapping the LDM symbol sequence
Constellation demapping is carried out to obtain an external information sequence { L J (j),j＝0,1,2,...,N CO -1}, wherein N CO Is the length of the coding sequence. Based on the de-interleaving device to the external information sequence { L J (j),j＝0,1,2,...,N CO -1, obtaining a deinterleaved sequence { L } P (p),p＝0,1,2,...,N CO -1}, said deinterleaving being a deinterleaving operation inverse to the interleaving of the transmission sender method of the multi-service. Decoding device-based de-interleaved sequence { L P (p),p＝0,1,2,...,N CO -1, decoding to obtain the mobile service information bit sequence as { B } M (b),b＝0,1,2,...,N Mbit -1}. The decoding being of multi-service typeDecoding by a channel decoding mode corresponding to the transmission and transmission method, for example: polar SLC decoding, LDPC sum-product decoding or maximum a posteriori decoding algorithm of Turbo code, etc.
Specifically, the method further comprises caching the LDM symbol sequence
In particular, the method further comprises caching the non-LDM symbol sequence { X } F2 (d),d＝0,1,2,...,K-1}。
Step S26, separation device pair based on LDM
And
calculated by an LDM separation formula
Specifically, the LDM separation formula is
Step S27, based on the symbol punching recovery device, the LDM symbol sequence
And non-LDM symbol sequences
According to the punching rule recovery, obtaining the estimated value of the pre-punching sequence
Specifically, the puncturing rule is a symbol puncturing rule of a symbol puncturing apparatus for a multi-service transmission and transmission method.
Step S28, based on the estimated value of the pre-puncture sequence of the bit-interleaved code modulation decoding device
After demapping, deinterleaving and decoding, the length N is generated Fbit Estimate of the information bit sequence of the fixed service
Specifically, the demapping, deinterleaving, and decoding are the same as the processing method in step S25 and are not described herein again.
As shown in fig. 2b, in an embodiment, the multi-service transmission and reception system of the present invention includes a guard interval removing device 200, a DFT transform device 201, a channel equalization device 202, a symbol multiplexing removing device 203, a first bit interleaving coding modulation decoding device 204, an LDM separating device 207, a symbol puncturing recovering device 208, and a second bit interleaving coding modulation decoding device 209.
The guard interval removal device 200 is configured to receive a data signal, and record the data signal as { r (t), t =0,1 F + C-1, removing the guard interval with the length of C to obtain the guard interval with the length of N F Of received signal sequence y m (l),l＝0,1,...,N F -1}.
The DFT transform device 201 is used for the received signal sequence y m (l),l＝0,1,...,N F -1} doing N F The point discrete Fourier transform outputs the first data sequence { Y } m (i),i＝0,1,...,N F -1}; wherein the point discrete fourier transform formula is:
the channel equalization apparatus 202 is used for recording { Y } for the first data sequence m (i),i＝0,1,...,N F -1, performing a channel equalization operation to obtain an equalized symbol sequence { E } m (i),i＝0,1,2,...,N F -1}.
The symbol multiplexing removal device 203 is used for the equalized symbol sequence { E } m (i),i＝0,1,2,...,N F -1} extraction of data from LDM symbol positionNotation as LDM symbol sequence
The non-LDM symbol position extraction data is marked as a non-LDM symbol sequence { X F2 (d),d＝0,1,2,...,K-1}。
The first bit-interleaved coded modulation and decoding device 204 is used for the LDM symbol sequence
Method for generating estimated value of information bit sequence of mobile service through demapping, deinterleaving and decoding
Wherein the estimated value
Input a first bit interleaving code modulation device to obtain
Specifically, the method further includes buffering the LDM symbol sequence based on the first buffering means 205.
Specifically, the method further includes buffering the non-LDM symbol sequence based on the second buffering means 206.
The LDM separation device 207 is used for the pair
And
calculated by LDM separation formula
The LDM separation formula is
The symbol puncturing and recovering device 208 is used for puncturing and recovering the LDM symbol sequence
And non-LDM symbol sequences
Recovering according to the punching rule to obtain the estimated value of the pre-punching sequence
The second bit-interleaved codec 209 is configured to estimate the estimated value of the pre-puncture sequence
After demapping, deinterleaving and decoding, the length N is generated Fbit Estimate of the information bit sequence of the fixed service
In an embodiment of the present invention, the present invention further includes a computer-readable storage medium, on which a computer program is stored, where the computer program is executed by a processor to implement any one of the transmission and transmission methods for multiple services.
Those of ordinary skill in the art will understand that: all or part of the steps for implementing the above method embodiments may be performed by hardware associated with a computer program. The aforementioned computer program may be stored in a computer readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
As shown in fig. 3, in an embodiment, the multi-service transmission and transmission apparatus of the present invention includes: a processor 31 and a memory 32; the memory 32 is for storing a computer program; the processor 31 is connected to the memory 32, and is configured to execute a computer program stored in the memory 32, so as to enable the apparatus for transmitting and receiving multiple services to execute any one of the methods for transmitting and receiving multiple services.
Specifically, the memory 32 includes: various media that can store program codes, such as ROM, RAM, magnetic disk, U-disk, memory card, or optical disk.
Preferably, the Processor 31 may be a general-purpose Processor, including a Central Processing Unit (CPU), a Network Processor (NP), and the like; the Integrated Circuit may also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, or discrete hardware components.
As shown in fig. 4, in an embodiment, the multi-service transmission and transmission system of the present invention includes the above-mentioned multi-service transmission and transmission device 41 and multi-service transmission and reception device 42.
The multi-service transceiver 42 is configured to receive a data signal based on a guard interval removal apparatus, and the data signal is recorded as { r (t), t =0,1 F + C-1, removing the guard interval with the length of C to obtain the guard interval with the length of N F Of received signal sequence y m (l),l＝0,1,...,N F -1}。
Based on DFT conversion device to the received signal sequence y m (l),l＝0,1,...,N F -1} doing N F Point discrete Fourier transform, outputting a first data sequence { Y } m (i),i＝0,1,...,N F -1}; wherein the point discrete Fourier transform formula is:
-assigning { Y to said first data sequence based on a channel equalization means m (i),i＝0,1,...,N F -1, performing a channel equalization operation to obtain an equalized symbol sequence { E } m (i),i＝0,1,2,...,N F -1}。
Symbol multiplexing removal device based on the equalized symbol sequence { E m (i),i＝0,1,2,...,N F -1Extracting data of LDM symbol position in the symbol sequence and recording the data as an LDM symbol sequence
The non-LDM symbol position extraction data is recorded as a non-LDM symbol sequence { X F2 (d),d＝0,1,2,...,K-1}。
The LDM symbol sequence is coded, modulated and decoded by a bit interleaving-based coding and decoding device
Method for generating estimated value of information bit sequence of mobile service through demapping, deinterleaving and decoding
Wherein the estimated value
Input a first bit interleaving code modulation device to obtain
Separation device pair based on LDM
And
calculated by LDM separation formula
The LDM separation formula is
Based on symbol punching recovery device to the LDM symbol sequence
And non-LDM symbol sequences
According to the recovery of the punching rule, obtaining the estimated value of the pre-punching sequence
Based on bit interleaving code modulation decoding device to estimate value of pre-punching sequence
Demapping, deinterleaving and decoding to generate the length N Fbit Estimate of the information bit sequence of the fixed service
In an embodiment, the transmission sending receiving system is implemented as shown in fig. 1d and fig. 2b, wherein the symbol puncturing apparatus is shown in fig. 1c, and the uniform equal-spaced puncturing apparatus is adopted, and under the condition that the power injection ratio is selected to be 10dB, the result of BER (bit error rate) performance of the transmission system for multi-service based on LDM is shown in fig. 4b, so as to improve the overall decoding performance when the punctured data is recovered. Compared with the traditional LDM scheme, the newly proposed LDM-based multi-service transmission system can improve the receiving signal-to-noise ratio threshold value of the fixed service when the bit code rate is 10-6 when the BICM symbol equally-spaced puncturing rate of the fixed service data is 1/12, and can improve the fixed service receiving performance by about 2.5dB when the symbol equally-spaced puncturing rate is 1/6. The invention can effectively improve the SNR threshold value required by the receiving of the fixed service, and the BER performance of the fixed service in a typical urban (TU-6) channel can be improved by about 2.5dB under the simulation parameters of the embodiment.
The simulation parameters of the embodiment are as follows:
the TU6 multipath channel model parameters are as follows:
in an embodiment, the block diagrams of the multi-service transmission transmitting and receiving system are shown in fig. 1d and fig. 2b, respectively, where the symbol puncturing apparatus is shown in fig. 1c. As shown, the specific punching mode is not limited to the following execution modes by using a punching device with unequal intervals: setting an energy threshold, performing energy discrimination on an input symbol sequence, taking symbols higher than the specified threshold as puncturing points and taking out the symbols until the symbol sequence meeting the required length is taken out, and if the number of the symbols is not enough, the threshold can be properly reduced. The BER performance results of services of the LDM based multi-service transmission system with the power injection ratio selected to be 0dB are shown in fig. 4 c. Under the simulation parameters of the embodiment, compared with the traditional LDM scheme, the performance of the newly proposed LDM-based multi-service transmission system for receiving fixed services is 10 of the error rate -6 The time is improved by about 1dB, and meanwhile, the mobile service performance carried by the LDM-CL can also be improved by about 1dB.
In summary, the multi-service transmission, reception method, system, medium, and apparatus of the present invention improve the reception characteristics of the EL layer fixed service without reducing the reception performance of the CL layer mobile service of the LDM. The SNR threshold value required by the receiving of the fixed service can be effectively improved, and even the performance of the mobile service carried by the CL layer can be improved under the condition that the LDM-EL layer power injection level is lower. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be accomplished by those skilled in the art without departing from the spirit and scope of the present invention as set forth in the appended claims.
Claims (10)
1. A method for transmitting and receiving multi-service transmission is characterized by comprising the following steps:
generating mobile service information bit sequence as { B based on mobile service information bit generation device M (b),b＝0,1,2,...,N Mbit -1}；
Mobile service information bit sequence B M (b),b＝0,1,2,...,N Mbit -1 as input, a first symbol sequence { X } of length D is generated by channel coding, bit interleaving and modulation based on a first bit interleaved coded modulation means M (d),d＝0,1,2,...,D-1}；
Generating a fixed service information bit sequence of { B ] based on a fixed service information bit generation means F (e),e＝0,1,2,...,N Fbit -1}；
Fixing the service information bit sequence B F (e),e＝0,1,2,...,N Fbit -1 as input, generating a sequence of code symbols of length Q { X } through channel coding, bit interleaving and modulation based on a second bit interleaved coded modulation means F (q),q＝0,1,2,...,Q-1}；
For the code symbol sequence { X F (Q), Q =0,1, 2.., Q-1} puncturing with a symbol puncturing device according to a puncturing rule; the puncturing rule is that the puncturing rate is v, and a second symbol sequence { X with the length of D is left after puncturing F1 (d) D =0,1, 2., D-1}, a third symbol sequence of length K { X } is punctured F2 (k) K =0,1,2,. K-1}, wherein the puncturing rate v satisfies the relationship v = (Q-D)/Q; the punching rules comprise equal-interval punching and unequal-interval punching;
based on LDM merging device, the first symbol sequence with length D is coded by the first code sequence X M (d) D =0,1, 2.,. D-1} and a second symbol sequence of length D { X } F1 (d) D =0,1, 2.,. D-1} is combined to generate a first LDM symbol sequence of { X } L (d) D =0,1,2, 1, D-1, calculated as X L (d)＝X M (d)+g·X F1 (d) D =0,1,2,. Ang, D-1, where g is the LDM lower layer signal power injection ratio;
based on data symbolsNumber multiplexing device for the first LDM symbol sequence { X L (d) D =0,1, 2.,. D-1} and a third symbol sequence { X } F2 (k) K =0,1, 2.,. K-1} frequency domain multiplexing outputs a fourth symbol sequence { X } m (l),l＝0,1,...,N F -1}；
IDFT transform device-based on the fourth symbol sequence { X m (l),l＝0,1,...,N F -1} doing N F And performing point inverse discrete Fourier transform, and recording an output fifth data sequence as { x m (i),i＝0,1,...,N F -1}；
Marking the fifth data sequence as { x based on the device for adding the cyclic prefix m (i),i＝0,1,...,N F -1, adding a guard interval with a preset length at the head or the tail of the channel to eliminate the intersymbol interference caused by the channel, and obtaining a data signal.
2. The method of claim 1, wherein the mobile service information bit sequence { B } M (b),b＝0,1,2,...,N Mbit -1 as input, a first symbol sequence { X } of length D is generated by channel coding, bit interleaving and modulation based on a first bit interleaved coded modulation means M (d) D =0,1,2,., D-1} includes:
based on channel coding device to said mobile service information bit sequence { B M (b),b＝0,1,2,...,N Mbit -1, channel coding to obtain coded sequence B P (p),p＝0,1,2,...,N CO -1}, wherein N CO The sequence length after coding is the mobile service information bit sequence;
based on interleaving device to said code sequence { B P (p),p＝0,1,2,...,N CO -1, interleaving to obtain an interleaved bit sequence { B } J (j),j＝0,1,2,...,N CO -1}；
Based on constellation mapping device to said interleaved bit sequence { B } J (j),j＝0,1,2,...,N CO -1 constellation mapping to obtain a first symbol sequence { X ] of length D M (d),d＝0,1,2,...,D-1}。
3. According toThe method for transmitting multi-service transmission as claimed in claim 1, wherein the frequency domain multiplexing formula is
Wherein N is F ＝N+K。
4. A multi-service transmission system, comprising: mobile service information bit generating device, first bit interleaving coding modulation device, fixed service information bit generating device, second bit interleaving coding modulation device, symbol punching device, LDM merging device, data symbol multiplexing device, IDFT conversion device and cyclic prefix adding device;
the mobile service information bit generation device is used for generating a mobile service information bit sequence of { B } M (b),b＝0,1,2,...,N Mbit -1}；
Mobile service information bit sequence B M (b),b＝0,1,2,...,N Mbit -1 as input, said first bit-interleaved coded modulation means being arranged to generate a first sequence of symbols of length D { X over channel coding, bit interleaving and modulation M (d),d＝0,1,2,...,D-1}；
The fixed service information bit generation means is for generating a fixed service information bit sequence of { B } F (e),e＝0,1,2,...,N Fbit -1}；
Fixing the service information bit sequence B F (e),e＝0,1,2,...,N Fbit -1 as input, said second bit-interleaved coded modulation means being arranged to generate a sequence of code symbols of length Q { X over channel coding, bit interleaving and modulation F (q),q＝0,1,2,...,Q-1}；
The symbol puncturing means is for puncturing the coded symbol sequence { X } F (Q), Q =0,1,2,.., Q-1} punching according to a punching rule; the puncturing rule is that the puncturing rate is v, and a second symbol sequence with the length of D is left after puncturing { X F1 (d) D =0,1,2,., D-1}, and puncturing to extract a third symbol sequence { X > of length K F2 (k) K =0,1,2,. K-1}, wherein the puncturing rate v satisfies the relationship v = (Q-D) · based on punch pressure, punch velocity, and punch depthQ；
The LDM merging device is used for a first symbol sequence { X with the length of D M (d) D =0,1,2, 1, D-1 and a second symbol sequence of length D { X } F1 (d) D =0,1, 2.,. D-1} is combined to generate a first LDM symbol sequence of { X } L (d) D =0,1,2, 1, D-1, calculated as X L (d)＝X M (d)+g·X F1 (d) D =0,1,2,. Ang, D-1, where g is the LDM lower layer signal power injection ratio;
the data symbol multiplexing device is used for the first LDM symbol sequence { X L (d) D =0,1, 2.,. D-1} and a third symbol sequence { X } F2 (k) K =0,1,2,.., K-1} is frequency domain multiplexed to output a fourth symbol sequence { X } m (l),l＝0,1,...,N F -1}；
The IDFT transform device is used for the fourth symbol sequence { X m (l),l＝0,1,...,N F -1} doing N F And performing point inverse discrete Fourier transform, and recording an output fifth data sequence as { x m (i),i＝0,1,...,N F -1}；
The cyclic prefix adding device is used for recording the fifth data sequence as { x m (i),i＝0,1,...,N F -1} adding a guard interval with a preset length at the head or tail of the data signal to eliminate the intersymbol interference caused by the channel, thereby obtaining the data signal.
5. A method for transmitting and receiving multiple services is characterized by comprising the following steps:
receiving a data signal based on a guard interval removal device, said data signal being recorded as { r (t), t =0,1 F + C-1, removing the guard interval with the length of C to obtain the guard interval with the length of N F Of received signal sequence y m (l),l＝0,1,...,N F -1}；
Based on DFT conversion device to the received signal sequence y m (l),l＝0,1,...,N F -1} is given as N F Performing point discrete Fourier transform to output a first data sequence of Y m (i),i＝0,1,...,N F -1}；
Recording the first data sequence based on a channel equalization device{Y m (i),i＝0,1,...,N F -1, performing a channel equalization operation to obtain an equalized symbol sequence { E } m (i),i＝0,1,2,...,N F -1}；
Removing the equalized symbol sequence { E) based on symbol multiplexing m (i),i＝0,1,2,...,N F -1} the LDM symbol position extracted data is recorded as LDM symbol sequence
The non-LDM symbol position extraction data is recorded as a non-LDM symbol sequence { X F2 (d),d＝0,1,2,...,K-1}；
Based on bit interleaving code modulation decoding device to the LDM symbol sequence
Demapping, deinterleaving and decoding to generate estimated value of information bit sequence of mobile service
Wherein the estimated value
Input first bit interleaving code modulation device to obtain
Separation device pair based on LDM
And
calculated by LDM separation formula
Based on symbol punching recovery device to the LDM symbol sequence
And non-LDM symbol sequences
Recovering according to the punching rule to obtain the estimated value of the pre-punching sequence
Based on bit interleaving code modulation decoding device to estimate value of pre-punching sequence
After demapping, deinterleaving and decoding, the length N is generated Fbit Estimate of the information bit sequence of the fixed service
6. The multi-service transmission and reception method according to claim 5, wherein the bit-interleaved coded modulation and decoding based apparatus performs coding and decoding on the LDM symbol sequences
Demapping, deinterleaving and decoding to generate estimated value of information bit sequence of mobile service
Wherein the estimated value
Input first bit interleaving code modulation device to obtain
The method comprises the following steps:
based on starsThe seat demapping device maps the LDM symbol sequence
Constellation demapping is carried out to obtain an external information sequence { L J (j),j＝0,1,2,...,N CO -1}, wherein N CO Is the length of the coding sequence;
based on the deinterleaving device to the external information sequence { L J (j),j＝0,1,2,...,N CO -1 to obtain a deinterleaved sequence L P (p),p＝0,1,2,...,N CO -1}；
Decoding device-based de-interleaved sequence { L P (p),p＝0,1,2,...,N CO -1, and obtaining the mobile service information bit sequence as B M (b),b＝0,1,2,...,N Mbit -1}。
7. A multi-service transmission receiving system, comprising: guard interval removing device, DFT conversion device, channel equalization device, symbol multiplexing removing device, first bit interleaving coding modulation decoding device, LDM separation device, symbol punching recovery device and second bit interleaving coding modulation decoding device;
the guard interval removal device is used for receiving a data signal, and the data signal is recorded as { r (t), t =0,1 F + C-1, removing the guard interval with the length of C to obtain the guard interval with the length of N F Of received signal sequence y m (l),l＝0,1,...,N F -1}；
The DFT conversion device is used for receiving the received signal sequence y m (l),l＝0,1,...,N F -1} doing N F Performing point discrete Fourier transform to output a first data sequence of Y m (i),i＝0,1,...,N F -1}；
The channel equalization device is used for recording { Y ] to the first data sequence m (i),i＝0,1,...,N F -1, performing a channel equalization operation to obtain an equalized symbol sequence { E } m (i),i＝0,1,2,...,N F -1}；
The symbol multiplexing and removing device is used for balancing the symbol sequenceColumn { E m (i),i＝0,1,2,...,N F -1} the LDM symbol position extracted data is recorded as LDM symbol sequence
The non-LDM symbol position extraction data is recorded as a non-LDM symbol sequence { X F2 (d),d＝0,1,2,...,K-1}；
The first bit interleaving coding modulation decoding device is used for the LDM symbol sequence
Method for generating estimated value of information bit sequence of mobile service through demapping, deinterleaving and decoding
Wherein the estimated value
Input first bit interleaving code modulation device to obtain
The LDM separation device is used for the pair
And with
Calculated by LDM separation formula
The symbol punching and recovering device is used for the LDM symbol sequence
And non-LDM symbol sequences
According to the punching rule recovery, obtaining the estimated value of the pre-punching sequence
The second bit interleaving code modulation decoding device is used for estimating the pre-puncturing sequence
After demapping, deinterleaving and decoding, the length N is generated Fbit Estimate of the information bit sequence of the fixed service
8. A computer-readable storage medium, on which a computer program is stored, the computer program being executable by a processor to implement the method for multi-service transmission according to any one of claims 1 to 3.
9. A multi-service transmission transmitting apparatus, comprising: a processor and a memory;
the memory is used for storing a computer program;
the processor is connected to the memory and configured to execute the computer program stored in the memory, so as to enable the multi-service transmission and transmission apparatus to execute the multi-service transmission and transmission method according to any one of claims 1 to 3.
10. A multi-service transmission receiving system comprising the multi-service transmission transmitting apparatus and the multi-service transmission receiving apparatus according to claim 9;
the multi-service transmission and receiving device is used for receiving a data signal based on a guard interval removing device, and the data signal is recorded as { r (t), t =0,1 F + C-1}, removing the guard interval with the length of C to obtain the guard interval with the length of N F Of received signal sequence y m (l),l＝0,1,...,N F -1}；
Based on DFT conversion device to the received signal sequence y m (l),l＝0,1,...,N F -1} doing N F Point discrete Fourier transform, outputting a first data sequence { Y } m (i),i＝0,1,...,N F -1}；
-assigning { Y to said first data sequence based on a channel equalization means m (i),i＝0,1,...,N F -1 performing a channel equalization operation to obtain an equalized symbol sequence { E } m (i),i＝0,1,2,...,N F -1}；
Removing the equalized symbol sequence { E) based on symbol multiplexing m (i),i＝0,1,2,...,N F -1} recording the LDM symbol position extracted data as a sequence of LDM symbols
The non-LDM symbol position extraction data is recorded as a non-LDM symbol sequence { X F2 (d),d＝0,1,2,...,K-1}；
Based on bit interleaving code modulation decoding device to the LDM symbol sequence
Method for generating estimated value of information bit sequence of mobile service through demapping, deinterleaving and decoding
Wherein the estimated value
Input a first bit interleaving code modulation device to obtain
LDM-based separation device pair
And
calculated by LDM separation formula
Based on symbol punching recovery device to the LDM symbol sequence
And non-LDM symbol sequences
According to the punching rule recovery, obtaining the estimated value of the pre-punching sequence
Based on bit interleaving code modulation decoding device to estimate value of pre-punching sequence
Demapping, deinterleaving and decoding to generate the length N Fbit Estimate of the information bit sequence of the fixed service
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