CN113037669B - Method and device for coding small blocks in satellite internet - Google Patents
Method and device for coding small blocks in satellite internet Download PDFInfo
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- CN113037669B CN113037669B CN202110265723.4A CN202110265723A CN113037669B CN 113037669 B CN113037669 B CN 113037669B CN 202110265723 A CN202110265723 A CN 202110265723A CN 113037669 B CN113037669 B CN 113037669B
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- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
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- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
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Abstract
The invention provides a method and a device for coding small blocks in a satellite internet, wherein the method comprises the following steps: by using [ c 0 c 1 z c 2 c 0 z c 1 c 2 z]The method comprises the step of carrying out small block coding on 2bit information under the 8PSK modulation mode to obtain coded bits, wherein c 2 ＝(c 0 +c 1 ) mod2, z is a placeholder; rate matching the coded bits; and scrambling the coded bits after rate matching in sequence according to a preset rule, so that the scrambled bits are distributed on 4 symbol points with the maximum Euclidean distance, and the reliability of data transmission is improved.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a small block coding method and device in satellite internet.
Background
In the 5G related art, a 2-bit control channel adopts a small block coding scheme, and a 2-bit small block coding scheme of BPSK, QPSK, 16QAM, 64QAM, and 256QAM modulation schemes is given in a protocol, and the coding scheme is as follows: c. C 2 ＝(c 0 +c 1 ) mod2, with N-3Q bits after coding m ，Q m Modulation order for the control channel:
| Q m | coded bit d 0 ,d 1 ,d 2 ,…,d N-1 |
| 1 | [c 0 c 1 c 2 ] |
| 2 | [c 0 c 1 c 2 c 0 c 1 c 2 ] |
| 4 | [c 0 c 1 x x c 2 c 0 x x c 1 c 2 x x] |
| 6 | [c 0 c 1 x x x x c 2 c 0 x x x x c 1 c 2 x x x x] |
| 8 | [c 0 c 1 x x x x x x c 2 c 0 x x x x x x c 1 c 2 x x x x x x] |
Where x is a placeholder, c i The pseudo-random sequence i is 0,1,2, x and y are placeholders, only the placeholder x is used in the 2-bit small block coding, it can be found that scrambling is only used for scrambling the data part, and the purpose of adding the placeholder is to maximize the Euclidean distance of the modulated bit distribution, so that the error correction capability is increased, and the reliability of data transmission is improved.
8PSK is a commonly used modulation scheme in satellite communication systems, but neither NR nor LTE provides 8PSK small block coding scheme for 2-bit control channel, and the small block coding scheme for 8PSK derived from the existing scheme is as follows:
according to modulation order Q m The small block coding scheme for deriving 8PSK for the law of 1 and 2 is as follows:
[c 0 c 1 c 2 c 0 c 1 c 2 c 0 c 1 c 2 ]
scrambling is performed in the above manner, the coding scheme does not introduce placeholders, scrambling is performed on all bits during scrambling, the constellation points are distributed as shown in fig. 1, the solid points are mapped points after scrambling, and it can be known from fig. 1 that the scrambled bits are randomly distributed on the whole 8PSK symbol.
According to modulation order Q m The small block coding scheme for deriving 8PSK for the 4, 6 and 8 regularities is as follows:
[c 0 c 1 x c 2 c 0 x c 1 c 2 x]
scrambling is performed in the above manner, the coding scheme introduces placeholders, scrambling is performed on data bits during scrambling, constellation points are distributed as shown in fig. 2, solid points are mapped points after scrambling, it can be seen that the scrambled bits are distributed on 4 constellation points of 001, 110, 101 and 111, and the bit distribution does not reach the maximum euclidean distance.
The decoding capability in the communication system is related to the minimum Euclidean distance of bits, and the bit distribution after scrambling by the two 8PSK small block coding methods does not reach the maximum Euclidean distance, so the two 8PSK small block coding methods have poor decoding capability and low transmission reliability.
Disclosure of Invention
In view of this, the present invention provides a method and an apparatus for small block coding in satellite internet, which distribute bits after scrambling over 4 symbol points with the largest euclidean distance, thereby increasing the reliability of data transmission.
In order to achieve the above purpose, the invention provides the following specific technical scheme:
a method for coding small blocks in a satellite Internet comprises the following steps:
by using [ c 0 c 1 z c 2 c 0 z c 1 c 2 z]The coding mode of (2) performing small block coding on the information of the 2-bit control channel to obtain coded bits, wherein c 2 ＝(c 0 +c 1 ) mod2, z is a placeholder;
rate matching the coded bits;
and scrambling the coded bits after rate matching in sequence according to a preset rule, so that the scrambled bits are distributed on 4 symbol points with the maximum Euclidean distance.
Optionally, the scrambling, according to a preset rule, the encoding bits after rate matching in sequence includes:
judging whether the scrambled bit number is smaller than the total bit number to be scrambled;
under the condition that the number of scrambled bits is smaller than the total number of bits to be scrambled, obtaining bits to be scrambled;
judging whether the bit to be scrambled is a placeholder z;
if the bit is the placeholder z, the output scrambling bit is the exclusive-or value of the scrambling bits corresponding to two bits before the bit to be scrambled, and the judgment whether the number of the scrambled bits is smaller than the total number of the bits to be scrambled is returned;
if the bit number is not the placeholder z, the output scrambling bit is the exclusive or value of the bit to be scrambled and the scrambling code sequence, and whether the judgment of the number of scrambled bits is smaller than the total number of bits to be scrambled is returned.
Optionally, when the modulation order of the 2-bit control channel is 3, the scrambled bits are distributed in 000,011,101,110.
Optionally, the scrambling, according to a preset rule, the encoding bits after rate matching in sequence includes:
judging whether the scrambled bit number is smaller than the total bit number to be scrambled;
under the condition that the number of scrambled bits is smaller than the total number of bits to be scrambled, obtaining bits to be scrambled;
judging whether the bit to be scrambled is a placeholder z;
if the bit is the placeholder z, the output scrambling bit is an exclusive or negation value of scrambling bits corresponding to two bits before the bit to be scrambled, and the judgment whether the number of the scrambled bits is smaller than the total number of the bits to be scrambled is returned;
if the bit number is not the placeholder z, the output scrambling bit is the exclusive or negation value of the bit to be scrambled and the scrambling code sequence, and the judgment whether the scrambled bit number is smaller than the total bit number to be scrambled is returned.
Optionally, when the modulation order of the 2-bit control channel is 3, the scrambled bits are distributed in 001,010,100,111.
A small block coding device in satellite internet comprises
A coding unit for adopting [ c ] 0 c 1 z c 2 c 0 z c 1 c 2 z]The coding mode of (2) performing small block coding on the information of the 2-bit control channel to obtain coded bits, wherein c 2 ＝(c 0 +c 1 ) mod2, z is a placeholder;
a rate matching unit for performing rate matching on the coded bits;
and the scrambling unit is used for scrambling the coded bits after the rate matching in sequence according to a preset rule so that the scrambled bits are distributed on 4 symbol points with the maximum Euclidean distance.
Optionally, the scrambling unit is specifically configured to:
judging whether the scrambled bit number is smaller than the total bit number to be scrambled;
under the condition that the number of scrambled bits is smaller than the total number of bits to be scrambled, obtaining bits to be scrambled;
judging whether the bit to be scrambled is a placeholder z;
if the bit is the placeholder z, the output scrambling bit is the exclusive-or value of the scrambling bits corresponding to two bits before the bit to be scrambled, and the judgment whether the number of the scrambled bits is smaller than the total number of the bits to be scrambled is returned;
if the bit number is not the placeholder z, the output scrambling bit is the exclusive or value of the bit to be scrambled and the scrambling code sequence, and whether the judgment of the number of scrambled bits is smaller than the total number of bits to be scrambled is returned.
Optionally, when the modulation order of the 2-bit control channel is 3, the scrambled bits are distributed in 000,011,101,110.
Optionally, the scrambling unit is specifically configured to:
judging whether the scrambled bit number is smaller than the total bit number to be scrambled;
under the condition that the number of scrambled bits is smaller than the total number of bits to be scrambled, obtaining bits to be scrambled;
judging whether the bit to be scrambled is a placeholder z or not;
if the bit is the placeholder z, the output scrambling bit is an exclusive or negation value of scrambling bits corresponding to two bits before the bit to be scrambled, and the judgment whether the number of the scrambled bits is smaller than the total number of the bits to be scrambled is returned;
if the bit number is not the placeholder z, the output scrambling bit is the exclusive or negation value of the bit to be scrambled and the scrambling code sequence, and the judgment whether the scrambled bit number is smaller than the total bit number to be scrambled is returned.
Optionally, when the modulation order of the 2-bit control channel is 3, the scrambled bits are distributed in 001,010,100,111.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a small block coding method in satellite internet, which makes the bit distribution after coding and scrambling reach the maximum Euclidean distance by inserting placeholder z in the small block coding process of 2bit information under 8PSK modulation mode, and improves the decoding capability of the communication system and the reliability of data transmission on the basis of increasing the Euclidean distance because the decoding capability in the communication system is related to the minimum Euclidean distance of the bit distribution after scrambling.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic diagram of constellation point distribution after coding and scrambling with a modulation order of 3(8PSK) derived from coding and scrambling manners with modulation orders of 1 and 2 in the prior art;
fig. 2 is a schematic diagram of constellation point distribution after coding and scrambling with a modulation order of 3(8PSK) derived from a coding and scrambling method with a modulation order of 4 and 6 in the prior art;
FIG. 3 is a schematic flowchart of a method for encoding a small block in a satellite Internet according to an embodiment of the present invention;
fig. 4 is a schematic flowchart of a method for scrambling bits to be scrambled according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a bit distribution after scrambling bits are xor according to an embodiment of the present invention;
fig. 6 is a schematic flowchart of another method for scrambling bits to be scrambled according to the embodiment of the present invention;
fig. 7 is a schematic diagram of a bit distribution after xor inversion of scrambled bits according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a small block coding device in a satellite internet according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention discloses a small block coding method of 2bit information under 8PSK modulation mode in satellite internet, which inserts a placeholder z in a code to make the bit distribution after coding and scrambling reach the maximum Euclidean distance.
Specifically, referring to fig. 3, the method for coding a small block in a satellite internet disclosed in this embodiment includes the following steps:
s101: by using [ c 0 c 1 z c 2 c 0 z c 1 c 2 z]The method comprises the step of carrying out small block coding on 2bit information under the 8PSK modulation mode to obtain coded bits, wherein c 2 ＝(c 0 +c 1 ) mod2, z is a placeholder;
since the present embodiment adopts [ c ] 0 c 1 z c 2 c 0 z c 1 c 2 z]As can be seen from the above coding method, in this embodiment, the modulation order of the control channel is 3, and the rest bit scrambling results are in the set {00,01,10,11} except for the placeholder.
S102: rate matching the coded bits;
the rate matching of the coded bits is the same as the existing rate matching method, namely, the coded bits are repeated or punctured under the control of an algorithm so as to ensure that the bit length after the rate matching is matched with the allocated physical channel resources.
S103: and scrambling the coded bits after rate matching in sequence according to a preset rule, so that the scrambled bits are distributed on 4 symbol points with the maximum Euclidean distance.
And the coded bits after rate matching are the bits to be scrambled, and the scrambled bits are distributed on 4 symbol points with the maximum Euclidean distance by scrambling each bit to be scrambled in sequence.
Referring to fig. 4, a method for sequentially scrambling bits to be scrambled among rate-matched coded bits according to a preset rule is as follows:
s201: judging whether the scrambled bit number is smaller than the total bit number to be scrambled;
if the scrambled bit number is smaller than the total bit number to be scrambled, executing S202: acquiring bits to be scrambled;
s203: judging whether the bit to be scrambled is a placeholder z;
if the placeholder z is the placeholder z, executing S204: the output scrambling bit is the exclusive or value of the scrambling bits corresponding to the two bits before the bit to be scrambled, and the step S201 is executed;
if not, execute S205: the output scrambling bit is the exclusive or value of the bit to be scrambled and the scrambling code sequence, and the S201 is executed in return;
if the scrambled bit number is not less than the total bit number to be scrambled, i.e. all bits to be scrambled have been scrambled, S206: and finishing the coding.
For a detailed description of the small block coding of 2-bit information in the 8PSK modulation mode in the satellite internet disclosed in the foregoing embodiments, please refer to the following specific embodiments.
Due to the 3 rd order modulation, the rest bit scrambling results are in the set {00,01,10,11} except the placeholder, when the placeholder of the input bit is z, the output scrambling bit is the exclusive-or value of the scrambling bits of the first two bits of the input bit, and the scrambled result [ c 0 c 1 z]Is in the set {000,011,101,110}, the scrambled bits are distributed as shown in fig. 5, and the bits are distributed on 4 symbol points with the largest Euclidean distance, thereby increasing the reliability of data transmission.
Referring to fig. 6, a method for sequentially scrambling bits to be scrambled among rate-matched coded bits according to a preset rule is as follows:
s301: judging whether the scrambled bit number is smaller than the total bit number to be scrambled;
if the scrambled bit number is smaller than the total bit number to be scrambled, executing S302: acquiring bits to be scrambled;
s303: judging whether the bit to be scrambled is a placeholder z;
if the placeholder z is the placeholder z, executing S304: the output scrambling bit is the exclusive or inverted value of the scrambling bits corresponding to the two bits before the bit to be scrambled, and the step S301 is executed;
if not, execute S305: the output scrambling bit is the exclusive or negation value of the bit to be scrambled and the scrambling code sequence, and the S301 is executed;
if the scrambled bit number is not less than the total bit number to be scrambled, i.e. all bits to be scrambled have been scrambled, S306: and finishing the coding.
For a detailed description of the small block coding of 2-bit information in the 8PSK modulation mode in the satellite internet disclosed in the foregoing embodiments, please refer to the following specific embodiments.
Due to 3-order modulation, the rest bit scrambling results are in a set {00,01,10,11} except placeholders, when the placeholder of the input bit is z, the output scrambling bit is the exclusive OR inversion value of the number of the scrambling bits of the first two bits of the input bit, and the scrambled result [ c 0 c 1 z]Is in the set {001,010,100,111}, the scrambled bits are distributed as shown in fig. 7, and the bits are distributed on the 4 symbol points with the largest Euclidean distance, thereby increasing the reliability of data transmission.
It can be seen that, in the small block coding method in the satellite internet disclosed in this embodiment, in the small block coding process of 2-bit information in the 8PSK modulation mode, by inserting the placeholder z, when the placeholder of the input bit is z, the output scrambled bit is the xor value or the xor negation value of the number of scrambled bits of the first two bits of the input bit, so that the bit distribution after the encoding scrambling reaches the maximum euclidean distance.
Based on the foregoing embodiments, a method for coding a small block in a satellite internet is disclosed, and this embodiment correspondingly discloses a device for coding a small block of 2-bit information in a satellite internet under a 8PSK modulation mode, please refer to fig. 8, where the device includes:
an encoding unit 100 for employing [ c ] 0 c 1 z c 2 c 0 z c 1 c 2 z]The method comprises the step of carrying out small block coding on 2bit information under the 8PSK modulation mode to obtain coded bits, wherein c 2 ＝(c 0 +c 1 ) mod2, z is a placeholder;
a rate matching unit 200 for performing rate matching on the coded bits;
and a scrambling unit 300, configured to scramble the coded bits after rate matching in sequence according to a preset rule, so that the scrambled bits are distributed on 4 symbol points with the largest euclidean distance.
Optionally, the scrambling unit 300 is specifically configured to:
judging whether the scrambled bit number is smaller than the total bit number to be scrambled;
under the condition that the number of scrambled bits is smaller than the total number of bits to be scrambled, obtaining bits to be scrambled;
judging whether the bit to be scrambled is a placeholder z;
if the bit is the placeholder z, the output scrambling bit is the exclusive-or value of the scrambling bits corresponding to two bits before the bit to be scrambled, and the judgment whether the number of the scrambled bits is smaller than the total number of the bits to be scrambled is returned;
if the bit number is not the placeholder z, the output scrambling bit is the exclusive or value of the bit to be scrambled and the scrambling code sequence, and whether the judgment of the number of scrambled bits is smaller than the total number of bits to be scrambled is returned.
Optionally, when the modulation order of the 2-bit control channel is 3, the scrambled bits are distributed in 000,011,101,110.
Optionally, the scrambling unit 300 is specifically configured to:
judging whether the scrambled bit number is smaller than the total bit number to be scrambled;
under the condition that the number of scrambled bits is smaller than the total number of bits to be scrambled, obtaining bits to be scrambled;
judging whether the bit to be scrambled is a placeholder z;
if the bit is the placeholder z, the output scrambling bit is an exclusive or negation value of scrambling bits corresponding to two bits before the bit to be scrambled, and the judgment whether the number of the scrambled bits is smaller than the total number of the bits to be scrambled is returned;
if the bit number is not the placeholder z, the output scrambling bit is the exclusive or negation value of the bit to be scrambled and the scrambling code sequence, and the judgment whether the scrambled bit number is smaller than the total bit number to be scrambled is returned.
Optionally, when the modulation order of the 2-bit control channel is 3, the scrambled bits are distributed in 001,010,100,111.
In the small block coding device in the satellite internet disclosed by the embodiment, in the small block coding process of 2-bit information in the 8PSK modulation mode, by inserting the placeholder z, when the placeholder of an input bit is z, the output scrambling bit is an exclusive or value or an exclusive or negation value of the number of the scrambling bits of the first two bits of the input bit, so that the distribution of the bits after coding and scrambling reaches the maximum Euclidean distance, and because the decoding capability in a communication system is related to the minimum Euclidean distance, the decoding capability of the communication system is improved on the basis of increasing the Euclidean distance, and the reliability of data transmission is increased.
The embodiment also discloses a communication device, comprising a memory and a processor:
the memory is to store program instructions;
the processor is used for executing the following small block coding method in the satellite internet according to the program stored in the memory:
by using [ c 0 c 1 z c 2 c 0 z c 1 c 2 z]The coding mode of (2) performing small block coding on the information of the 2-bit control channel to obtain coded bits, wherein c 2 ＝(c 0 +c 1 ) mod2, z is a placeholder;
rate matching the coded bits;
and scrambling the coded bits after rate matching in sequence according to a preset rule, so that the scrambled bits are distributed on 4 symbol points with the maximum Euclidean distance.
Further, the scrambling the coded bits after the rate matching in sequence according to the preset rule includes:
judging whether the scrambled bit number is smaller than the total bit number to be scrambled;
under the condition that the number of scrambled bits is smaller than the total number of bits to be scrambled, obtaining bits to be scrambled;
judging whether the bit to be scrambled is a placeholder z;
if the bit is the placeholder z, the output scrambling bit is the exclusive-or value of the scrambling bits corresponding to two bits before the bit to be scrambled, and the judgment whether the number of the scrambled bits is smaller than the total number of the bits to be scrambled is returned;
if the bit number is not the placeholder z, the output scrambling bit is the exclusive or value of the bit to be scrambled and the scrambling code sequence, and whether the judgment of the number of scrambled bits is smaller than the total number of bits to be scrambled is returned.
Further, when the modulation order of the 2-bit control channel is 3 orders, the scrambled bits are distributed in 000,011,101,110.
Further, the scrambling the coded bits after the rate matching in sequence according to the preset rule includes:
judging whether the scrambled bit number is smaller than the total bit number to be scrambled;
under the condition that the number of scrambled bits is smaller than the total number of bits to be scrambled, obtaining bits to be scrambled;
judging whether the bit to be scrambled is a placeholder z;
if the bit is the placeholder z, the output scrambling bit is an exclusive or negation value of scrambling bits corresponding to two bits before the bit to be scrambled, and the judgment whether the number of the scrambled bits is smaller than the total number of the bits to be scrambled is returned;
if the bit number is not the placeholder z, the output scrambling bit is the exclusive or negation value of the bit to be scrambled and the scrambling code sequence, and the judgment whether the scrambled bit number is smaller than the total bit number to be scrambled is returned.
Further, when the modulation order of the 2-bit control channel is 3 orders, the scrambled bits are distributed in 001,010,100,111.
The embodiment also discloses a storage medium, on which a computer program is stored, which when executed by a processor implements the following method for encoding a tile in a satellite internet:
by using [ c 0 c 1 z c 2 c 0 z c 1 c 2 z]The coding mode of (2) performing small block coding on the information of the 2-bit control channel to obtain coded bits, wherein c 2 ＝(c 0 +c 1 ) mod2, z is a placeholder;
rate matching the coded bits;
and scrambling the coded bits after rate matching in sequence according to a preset rule, so that the scrambled bits are distributed on 4 symbol points with the maximum Euclidean distance.
Further, the scrambling the coded bits after the rate matching in sequence according to the preset rule includes:
judging whether the scrambled bit number is smaller than the total bit number to be scrambled;
under the condition that the number of scrambled bits is smaller than the total number of bits to be scrambled, obtaining bits to be scrambled;
judging whether the bit to be scrambled is a placeholder z;
if the number of the bits is the placeholder z, the output scrambling bits are exclusive or values of scrambling bits corresponding to two bits before the bits to be scrambled, and the judgment whether the number of the scrambled bits is smaller than the total number of the bits to be scrambled is returned;
if the bit number is not the placeholder z, the output scrambling bit is the exclusive or value of the bit to be scrambled and the scrambling code sequence, and whether the judgment of the number of scrambled bits is smaller than the total number of bits to be scrambled is returned.
Further, when the modulation order of the 2-bit control channel is 3 orders, the scrambled bits are distributed in 000,011,101,110.
Further, the scrambling the coded bits after the rate matching in sequence according to the preset rule includes:
judging whether the scrambled bit number is smaller than the total bit number to be scrambled;
under the condition that the number of scrambled bits is smaller than the total number of bits to be scrambled, obtaining bits to be scrambled;
judging whether the bit to be scrambled is a placeholder z;
if the number of the bits is the placeholder z, the output scrambled bits are exclusive-or negatives of the scrambled bits corresponding to the two bits before the bits to be scrambled, and the judgment whether the number of the scrambled bits is smaller than the total number of the bits to be scrambled is returned;
if the bit number is not the placeholder z, the output scrambling bit is the exclusive or negation value of the bit to be scrambled and the scrambling code sequence, and the judgment whether the scrambled bit number is smaller than the total bit number to be scrambled is returned.
Further, when the modulation order of the 2-bit control channel is 3 orders, the scrambled bits are distributed in 001,010,100,111.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. A method for coding small blocks in a satellite Internet, which is characterized by comprising the following steps:
by using [ c 0 c 1 z c 2 c 0 z c 1 c 2 z]The coding mode of (2) performing small block coding on the information of the 2-bit control channel to obtain coded bits, wherein c 2 ＝(c 0 +c 1 ) mod2, z is a placeholder;
rate matching the coded bits;
scrambling the coded bits after rate matching in sequence according to a preset rule, so that the scrambled bits are distributed on 4 symbol points with the largest Euclidean distance;
the scrambling is sequentially performed on the coded bits after rate matching according to a preset rule, so that the scrambled bits are distributed on 4 symbol points with the largest Euclidean distance, and the method comprises the following steps:
judging whether the scrambled bit number is smaller than the total bit number to be scrambled;
under the condition that the number of scrambled bits is smaller than the total number of bits to be scrambled, obtaining bits to be scrambled;
judging whether the bit to be scrambled is a placeholder z;
if the bit is the placeholder z, the output scrambling bit is the exclusive-or value of the scrambling bits corresponding to two bits before the bit to be scrambled, and the judgment whether the number of the scrambled bits is smaller than the total number of the bits to be scrambled is returned;
if the bit number is not the placeholder z, the output scrambling bit is the exclusive or value of the bit to be scrambled and the scrambling code sequence, and whether the judgment of the number of scrambled bits is smaller than the total number of bits to be scrambled is returned;
or
The scrambling is sequentially performed on the coded bits after rate matching according to a preset rule, so that the scrambled bits are distributed on 4 symbol points with the largest Euclidean distance, and the method comprises the following steps:
judging whether the scrambled bit number is smaller than the total bit number to be scrambled;
under the condition that the number of scrambled bits is smaller than the total number of bits to be scrambled, obtaining bits to be scrambled;
judging whether the bit to be scrambled is a placeholder z;
if the number of the bits is the placeholder z, the output scrambled bits are exclusive-or negatives of the scrambled bits corresponding to the two bits before the bits to be scrambled, and the judgment whether the number of the scrambled bits is smaller than the total number of the bits to be scrambled is returned;
if the bit number is not the placeholder z, the output scrambling bit is the exclusive or negation value of the bit to be scrambled and the scrambling code sequence, and the judgment whether the scrambled bit number is smaller than the total bit number to be scrambled is returned.
2. The method of claim 1, wherein when the output scrambled bits are the exclusive-or value of the scrambled bits corresponding to two bits before the bit to be scrambled or the exclusive-or value of the output scrambled bits and the scrambling sequence, when the modulation order of the 2-bit control channel is 3 orders, the scrambled bits are distributed in {000,011,101,110 }.
3. The method of claim 1, wherein when the output scrambled bits are the exclusive-or negation value of the scrambled bits corresponding to two bits before the bit to be scrambled or the exclusive-or negation value of the bit to be scrambled and the scrambling sequence, the bits after scrambling are distributed at {001,010,100,111} when the modulation order of the 2-bit control channel is 3.
4. A small block coding device in satellite internet is characterized by comprising
A coding unit for adopting [ c ] 0 c 1 z c 2 c 0 z c 1 c 2 z]The coding mode of (2) performing small block coding on the information of the 2-bit control channel to obtain coded bits, wherein c 2 ＝(c 0 +c 1 ) mod2, z is a placeholder;
a rate matching unit for performing rate matching on the coded bits;
the scrambling unit is used for scrambling the coded bits after the rate matching in sequence according to a preset rule so that the scrambled bits are distributed on 4 symbol points with the maximum Euclidean distance;
the scrambling unit is specifically used for judging whether the scrambled bit number is smaller than the total bit number to be scrambled; under the condition that the number of scrambled bits is smaller than the total number of bits to be scrambled, obtaining bits to be scrambled; judging whether the bit to be scrambled is a placeholder z; if the bit is the placeholder z, the output scrambling bit is the exclusive-or value of the scrambling bits corresponding to two bits before the bit to be scrambled, and the judgment whether the number of the scrambled bits is smaller than the total number of the bits to be scrambled is returned; if the bit number is not the placeholder z, the output scrambling bit is the exclusive or value of the bit to be scrambled and the scrambling code sequence, and whether the judgment of the number of scrambled bits is smaller than the total number of bits to be scrambled is returned;
or
The scrambling unit is specifically used for judging whether the scrambled bit number is smaller than the total bit number to be scrambled; under the condition that the number of scrambled bits is smaller than the total number of bits to be scrambled, obtaining bits to be scrambled; judging whether the bit to be scrambled is a placeholder z; if the bit is the placeholder z, the output scrambling bit is an exclusive or negation value of scrambling bits corresponding to two bits before the bit to be scrambled, and the judgment whether the number of the scrambled bits is smaller than the total number of the bits to be scrambled is returned; if the bit number is not the placeholder z, the output scrambling bit is the exclusive or negation value of the bit to be scrambled and the scrambling code sequence, and the judgment whether the scrambled bit number is smaller than the total bit number to be scrambled is returned.
5. A communication device, comprising a memory and a processor:
the memory is to store program instructions;
the processor is used for executing the small block coding method in the satellite internet according to the program stored in the memory, wherein the method is as defined in any one of claims 1 to 3.
6. A storage medium having stored thereon a computer program, wherein the computer program, when being executed by a processor, implements a method for coding tiles in a satellite internet according to any one of claims 1 to 3.
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