CN105656833B - Non-uniformly modulated method in NGB-W systems - Google Patents
Non-uniformly modulated method in NGB-W systems Download PDFInfo
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- CN105656833B CN105656833B CN201410642149.XA CN201410642149A CN105656833B CN 105656833 B CN105656833 B CN 105656833B CN 201410642149 A CN201410642149 A CN 201410642149A CN 105656833 B CN105656833 B CN 105656833B
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Abstract
The present invention provides non-uniform constellation figure and non-uniformly modulated method in a kind of NGB W systems, includes the following steps：Step S1, by bit map to tuple；Step S2, tuple is mapped as by modulation symbol according to corresponding non-uniform constellation figure.Non-uniform constellation figure and non-uniformly modulated method in the NGB W systems of the present invention devise the planisphere of NU 64QAM and NU 256QAM；Compared with traditional homogeneous modulation, the performance gain of 0.3 ~ 0.62dB can be obtained using the BICM systems of NU 64QAM, and the performance gain of 0.76 ~ 1.3dB can be obtained using the BICM systems of NU 256QAM.
Description
Technical field
The present invention relates to the technical fields of physical layer transmission in communication system, more particularly to a kind of next-generation radio and television
Non-uniform constellation figure in (NGB-W, Next Generation BroadcastNetwork-Wireless) system that net is wireless and
Non-uniformly modulated method.
Background technology
With the fast development of world economy culture, demand rapid growth of the user to wireless information services.Individually according to
By conventional wireless radio network or conventional wireless bi-directional communication network, the optimization transmission of information service cannot achieve.At the same time,
People are no longer content with only watching traditional radiated television business, but have more to novel radio broadcast television service
Carry out stronger demand.NGB-W systems can realize the amalgamation and coexistence of radio broadcasting and wireless two-way communication, be to solve mobile message
Contradictory effective way between business datum amount rapid growth and wireless network transmissions capacity are limited, and support are wired, wireless
The necessary ways of information hierarchy business.
In wireless environment complicated and changeable, the transmission of NGB-W system business faces serious interference and noise problem.In conjunction with
Error Correction of Coding and the BICM of modulation (Bit Interleaved Coded Modulation, Bit Interleaved Coded Modulation) technology are
Ensure the reliability of information transmission, overcome one of the most effective technology of noise and interference.BICM includes three parts：Forward error correction
Code, Bit Interleave and QAM (Quadrature Amplitude Modulation, quadrature amplitude modulation) modulation.Wherein, QAM tune
The effect of system is that bit tuple is mapped as modulation symbol.
In traditional communication system, such as DVB-T2 (transmission of second generation Digital European ground TV broadcast), it uses
QAM modulation based on gray mappings and uniform planisphere, abbreviation homogeneous modulation.Homogeneous modulation have constellation point between at equal intervals,
Planisphere is rectangular feature, as shown in Figure 1.This planisphere can ensure that the Euclidean distance between modulation symbol maximizes,
But it cannot be guaranteed that the Average Mutual for receiving signal is maximum.Therefore, using the performance distance Shannon of the BICM systems of homogeneous modulation
Limit also has larger gap, and the performance of BICM systems can be made more to approach shannon limit using non-uniformly modulated.Fig. 2 is one
The planisphere of the 256QAM (Non-Uniform 256QAM, NU-256QAM) of non-uniformly modulated.
Motion of the Sony in ATSC3.0《S32-2-124r0_SS_NUQAM_Presentation-2014-02-02》
In point out：As order of modulation increases to 256QAM from 16QAM, compared to the BICM systems using homogeneous modulation, using two dimension
The BICM systems of (2D)-non-uniformly modulated can additionally obtain 0.3 to 1.85dB gain.
In order to improve the transmission performance of NGB-W system BICM schemes, multiple code checks for NGB-W systems is needed to provide more
Add the planisphere for approaching shannon limit and corresponding non-uniformly modulated method.
Invention content
In view of the foregoing deficiencies of prior art, the purpose of the present invention is to provide non-equal in a kind of NGB-W systems
Even modulator approach provides the planisphere of NU-64QAM and NU-256QAM and corresponding for multiple code checks of NGB-W systems
Non-uniformly modulated method, to further increase NGB-W systems BICM performance, so that it is more approached shannon limit.
In order to achieve the above objects and other related objects, the present invention provides what NU-64QAM in a kind of NGB-W systems was modulated
Planisphere.
Meanwhile the present invention also provides the NU-64QAM modulator approaches in a kind of NGB-W systems, including the following steps：
Step S1, by bit map to tuple；Wherein, in bit interleaver output bit flow
In, it will be per continuous ηMODA bit forms a tuple wg, i.e. wg=[wg,0wg,1...wg,p...wg,ηMOD-1]T, 0≤g≤NLDPC/
ηMOD- 1, NLDPCFor bitstream length, bit viFor p-th of bit w of g-th of tupleg,p, wherein 0≤i≤NLDPC- 1, p=i
mod ηMOD, g=i div ηMOD；
Step S2, carry out NU-64QAM modulation when, when code check be 1/5,1/4,1/3,5/12,1/2,7/12,2/3,3/4,
When 4/5 and 5/6, using the planisphere of above-mentioned NU-64QAM modulation by tupleIt reflects
It penetrates as modulation symbol.
According to the NU-64QAM modulator approaches in above-mentioned NGB-W systems, wherein：When being modulated using NU-64QAM, ηMODIt takes
Value is 6.
In addition, the present invention also provides the planispheres that NU-256QAM in a kind of NGB-W systems is modulated.
Meanwhile the present invention also provides the NU-256QAM modulator approaches in a kind of NGB-W systems, including the following steps：
Step S1, by bit map to tuple；Wherein, in bit interleaver output bit flow
In, it will be per continuous ηMODA bit forms a tuple wg, i.e.,0≤g≤NLDPC/
ηMOD- 1, NLDPCFor bitstream length, bit viFor p-th of bit w of g-th of tupleg,p, wherein 0≤i≤NLDPC- 1, p=i
mod ηMOD, g=i div ηMOD；
Step S2, carry out NU-256QAM modulation when, when code check be 1/5,1/4,1/3,5/12,1/2,7/12,2/3,3/4,
When 4/5 and 5/6, using the planisphere of above-mentioned NU-256QAM modulation by tupleIt reflects
It penetrates as modulation symbol.
According to the NU-256QAM modulator approaches in above-mentioned NGB-W systems, wherein：When being modulated using NU-256QAM, ηMOD
Value is 8.
As described above, the non-uniformly modulated method in the NGB-W systems of the present invention, has the advantages that：
(1) planisphere of NU-64QAM and NU-256QAM are devised；
(2) compared with traditional homogeneous modulation, the property of 0.3~0.62dB can be obtained using the BICM systems of NU-64QAM
Energy gain, the performance gain of 0.76~1.3dB can be obtained using the BICM systems of NU-256QAM.
Description of the drawings
Fig. 1 is shown as the planisphere of homogeneous modulation 256QAM in the prior art；
Fig. 2 is shown as the planisphere of NU-256QAM when code check in the prior art is 1/2；
Fig. 3 is shown as the flow chart of the non-uniformly modulated method in the NGB-W systems of the present invention.
Specific implementation mode
Illustrate that embodiments of the present invention, those skilled in the art can be by this specification below by way of specific specific example
Disclosed content understands other advantages and effect of the present invention easily.The present invention can also pass through in addition different specific realities
The mode of applying is embodied or practiced, the various details in this specification can also be based on different viewpoints with application, without departing from
Various modifications or alterations are carried out under the spirit of the present invention.
It should be noted that the diagram provided in the present embodiment only illustrates the basic conception of the present invention in a schematic way,
Then component count, shape and size when only display is with related component in the present invention rather than according to actual implementation in schema are painted
System, when actual implementation kenel, quantity and the ratio of each component can be a kind of random change, and its assembly layout kenel also may be used
It can be increasingly complex.
When carrying out coded modulation, the output bit flow of bit interleaver is mapped as tuple by NGB-W systems first, then will
Tuple is mapped as modulation symbol.It is total that NGB-W systems are provided with 1/5,1/4,1/3,5/12,1/2,7/12,2/3,3/4,4/5,5/6
10 kinds of code checks have dedicated planisphere for each modulation system, each code check.
With reference to Fig. 3, the non-uniformly modulated method in NGB-W systems of the invention includes the following steps：
Step S1, by bit map to tuple.
Specifically, in bit interleaver output bit flowIn, it will be per continuous ηMODA bit group
At a tuple, i.e.,0≤g≤NLDPC/ηMOD- 1, NLDPCFor bitstream length.
Bit viFor p-th of bit w of g-th of tupleg,p, wherein 0≤i≤NLDPC- 1, p=i mod ηMOD, g=i div ηMOD。
For different modulating mode, ηMODValue also differ.It is specific as shown in table 1.
η under table 1, different modulating modeMODValue
| Modulation system | ηMOD |
| BPSK | 1 |
| QPSK | 2 |
| NU-16QAM | 4 |
| NU-64QAM | 6 |
| NU-256QAM | 8 |
| NU-1024QAM | 10 |
Step S2, tuple is mapped as by modulation symbol by non-uniform constellation figure according to corresponding non-uniform constellation figure.
Specifically, according to corresponding non-uniform constellation figure by tupleIt is mapped as
Modulation symbol
The modulation system that NGB-W systems are supported includes QPSK, NU-16QAM, NU-64QAM, NU-256QAM and NU-
1024QAM.The corresponding tuple of difference code check is accorded with modulation when being given using NU-64QAM, NU-256QAM in table 2 and table 3
Correspondence between number.
When carrying out NU-264QAM modulation, when code check is 1/5,1/4,1/3,5/12,1/2,7/12,2/3,3/4,4/5 and 5/
When 6, using the planisphere of table 2 by tupleIt is mapped as modulation symbol.
When carrying out NU-256QAM modulation, when code check is 1/5,1/4,1/3,5/12,1/2,7/12,2/3,3/4,4/5 and 5/
When 6, using the planisphere of table 3 by tupleIt is mapped as modulation symbol.
Constellation mappings under table 2, NU-64QAM modulation
Constellation mappings under table 3, NU-256QAM modulation
Specifically, it is assumed that BICM systems are encoded using the FEC of 1/2 code check, modulation system NU-256QAM, Bit Interleave
The bit stream of device output is 0100101010110001, then the bit stream is mapped as the modulation symbol of two NU-256QAM, point
It Wei not -0.13331-0.644i and 1.6291+0.49432i.The modulation of other bit streams and so on, details are not described herein.
In conclusion the non-uniformly modulated method in the NGB-W systems of the present invention devises NU-64QAM and NU-256QAM
Planisphere；Compared with traditional homogeneous modulation, the performance of 0.3~0.62dB can be obtained using the BICM systems of NU-64QAM
Gain can obtain the performance gain of 0.76~1.3dB using the BICM systems of NU-256QAM.So the present invention effectively overcomes
Various shortcoming in the prior art and have high industrial utilization.
The above-described embodiments merely illustrate the principles and effects of the present invention, and is not intended to limit the present invention.It is any ripe
The personage for knowing this technology can all carry out modifications and changes to above-described embodiment without violating the spirit and scope of the present invention.Cause
This, institute is complete without departing from the spirit and technical ideas disclosed in the present invention by those of ordinary skill in the art such as
At all equivalent modifications or change, should by the present invention claim be covered.
Claims (4)
1. a kind of 64QAM modulator approaches of the non-uniformly modulated in NGB-W systems, it is characterised in that：Include the following steps：
Step S1, by bit map to tuple；Wherein, in bit interleaver output bit flowIn,
It will be per continuous ηMODA bit forms a tuple wg, i.e.,0≤g≤NLDPC/
ηMOD- 1, NLDPCFor bitstream length, bit viFor p-th of bit w of g-th of tupleg,p, wherein 0≤i≤NLDPC- 1, p=i
modηMOD, g=i div ηMOD；
Step S2, carry out non-uniformly modulated 64QAM modulation when, when code check be 1/5,1/4,1/3,5/12,1/2,7/12,2/3,
3/4,4/5 and 5/6 when, using the planisphere of following table by tupleIt is mapped as modulating
Symbol；
。
2. the 64QAM modulator approaches of the non-uniformly modulated in NGB-W systems according to claim 1, it is characterised in that：It adopts
When being modulated with the 64QAM of non-uniformly modulated, ηMODValue is 6.
3. a kind of 256QAM modulator approaches of the non-uniformly modulated in NGB-W systems, it is characterised in that：Include the following steps：
Step S1, by bit map to tuple；Wherein, in bit interleaver output bit flowIn,
It will be per continuous ηMODA bit forms a tuple wg, i.e.,0≤g≤NLDPC/
ηMOD- 1, NLDPCFor bitstream length, bit viFor p-th of bit w of g-th of tupleg,p, wherein 0≤i≤NLDPC- 1, p=i
modηMOD, g=i div ηMOD；
When step S2, carrying out the 256QAM modulation of non-uniformly modulated, when code check is 1/5,1/4,1/3,5/12,1/2,7/12,2/
3,3/4,4/5 and 5/6 when, using the planisphere of following table by tupleIt is mapped as adjusting
Symbol processed；
。
4. the 256QAM modulator approaches of the non-uniformly modulated in NGB-W systems according to claim 3, it is characterised in that：
When being modulated using the 256QAM of non-uniformly modulated, ηMODValue is 8.
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| WO2018033641A1 (en) * | 2016-08-19 | 2018-02-22 | Sony Corporation | Wireless communication transceiver and wireless communication method |
| CN107846377B (en) * | 2016-09-19 | 2021-08-03 | 华为技术有限公司 | Method and device for transmitting data |
| CN113497776B (en) * | 2020-04-08 | 2023-03-28 | 华为技术有限公司 | Modulation method and device |
| CN114079531B (en) * | 2020-08-19 | 2023-02-28 | 上海交通大学 | Bit division multiplexing non-uniform constellation diagram design method, system and medium |
| CN114079532A (en) * | 2020-08-19 | 2022-02-22 | 上海交通大学 | Interleaving mapping method and system based on non-uniform constellation diagram with concentric circle structure |
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