CN104092518A - Indoor visible light MIMO transmission scheme integrating spatial modulation and space multiplexing technology - Google Patents
Indoor visible light MIMO transmission scheme integrating spatial modulation and space multiplexing technology Download PDFInfo
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- CN104092518A CN104092518A CN201410249388.9A CN201410249388A CN104092518A CN 104092518 A CN104092518 A CN 104092518A CN 201410249388 A CN201410249388 A CN 201410249388A CN 104092518 A CN104092518 A CN 104092518A
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- led lamp
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Abstract
The invention belongs to the field of indoor visible light communication, and specifically relates to an indoor visible light MIMO transmission scheme integrating spatial modulation and the space multiplexing technology. The number of LED lamps of an indoor visible light communication MIMO system is recorded as N, and the number of photoelectric detectors is recorded as M. The transmission method comprises the following steps: (1) LED lamp grouping; (2) channel training; (3) transmission scheme setting; and (4) receiving detection scheme setting. The invention is an MIMO transmission scheme integrating spatial modulation and the space multiplexing technology. Compared with traditional methods, the MIMO transmission scheme has the following advantages: the spacing of the LED lamps in the groups is large enough and the correlation between the LED lamps in the groups is relatively small through LED lamp grouping, and the space multiplexing gain can be improved by adoption of an SMP technology; and an SM technology is adopted between the groups, only one LED lamp group sends information in a single time slot, and mutual interference between LED lamps with strong correlation is avoided.
Description
Technical field
The invention belongs to indoor visible light communication field, be specifically related to a kind of indoor visible ray MIMO transmission plan in conjunction with spatial modulation (SM) and spatial reuse (SMP) technology.
Background technology
Visible light communication (VLC), as a kind of emerging technology that can realize indoor high-speed transfer of data, more and more causes extensive concern both domestic and external.It adopts the light of visible light wave range as the carrier of Information Communication, utilize that white light emitting diode (LED) sends visually observe less than High Speed Modulation light wave signal come, to information modulation and transmission, then to utilize the electrooptical devices such as photodiode (PD) to receive optical carrier acquired information.Compare with other light wireless communications with traditional radio communication, VLC have transmitting power high, without the advantage such as electromagnetic interference, environmental protection, thereby there is great development prospect.The target of indoor VLC is to realize high speed data transfers, but the modulation bandwidth of existing white LED lamp is lower, and the 20M that only has an appointment has seriously restricted the raising of traffic rate.MIMO technology is applied to indoor VLC, can increases potentially link sphere of action, overcome communication link by indoor occupant walk about, the shade of furniture and the problem that interrupts, improve the reliability of link; Can under the condition that does not increase system bandwidth and transmitting power, improve the availability of frequency spectrum, thereby improve message transmission rate simultaneously.And room lighting needs multiple white LED lamps, this provides abundant space resources for indoor VLC.
But indoor VLC MIMO mainly considers direct projection link, channel is relatively definite, and indoor VLC employing intensity modulated (IM) and direct-detection (DD), lacks frequency and phase component, between each subchannel, interference ratio is more serious, causes channel to have stronger correlation.Especially in the time that LED lamp spacing is very little, channel relevancy is very strong, and space multiplexing technique is unavailable, causes obtaining spatial reuse gain, the raising of VLCMIMO system communication speed in confinement cells.For indoor VLC mimo channel, strong correlation causes the way to solve the problem that cannot obtain spatial reuse gain to mainly contain two kinds at present: one is imaging type mimo system, and one is spatial modulation (SM) mimo system.Imaging type receiver is made up of multiple pixels, projects on different pixels by the information that different LED lamp is sent, and eliminates interchannel interference; Imaging type receiver structure is comparatively simple, be easy to realize, but location information is comparatively responsive, projects on identical pixel in some position Different Light, cannot demodulate each transmitting information, cannot meet the requirement of mobility and seamless coverage.The single time slot of spatial modulation mimo system only has 1 LED lamp to send information, has avoided interchannel interference, and the LED lamp of each transmission information carries spatial positional information simultaneously, can realize log
2(N
t) spatial reuse gain; But receiving terminal detects the positional information that sends LED lamp by maximum likelihood (ML), need a large amount of training expenses, and spatial reuse gain is lower.How to have under stronger correlation and to solve better the problem that mimo system spatial reuse is low at channel, effectively utilize the abundant space resources of indoor VLC, obtain spatial reuse gain, be still a hot issue of current indoor VLC MIMO research.
Summary of the invention
The present invention is directed to prior art and exist indoor VLC mimo channel correlation to cause by force the problem that spatial reuse is low, propose the MIMO transmission plan of a kind of combination spatial modulation and space multiplexing technique.
Technical scheme of the present invention is: the indoor visible ray MIMO transmission plan of a kind of combination spatial modulation and space multiplexing technique, remember that the LED lamp number of indoor visible light communication mimo system is N, and the number of photoelectric detector is M, this transmission method comprises the following steps:
(1) LED lamp is divided into groups;
(2) carry out channel training;
(3) delivery plan is set;
(4) reception detection scheme is set.
The indoor visible ray MIMO transmission plan of described combination spatial modulation and space multiplexing technique, described by LED be grouped into note grouping number be N
g, every group comprises N
tindividual LED lamp, N
t=N/N
g; The minimum lamp of the LED lamp in group is apart from the demand of meeting spatial multiplex technique, and N
t≤ M.
The indoor visible ray MIMO transmission plan of described combination spatial modulation and space multiplexing technique, the described channel training that carries out is that each LED lamp group sends respectively training sequence, symbol when the each LED lamp group of receiving terminal acquisition reception sends information separately, the glossary of symbols while detection as maximum likelihood (ML); Channel condition information when estimating each group of LED lamp simultaneously and sending respectively, receiving terminal estimates and sends after LED lamp group, utilizes corresponding channel condition information to solve multiplexed information in group.
The indoor visible ray MIMO transmission plan of described combination spatial modulation and space multiplexing technique, the described delivery plan that arranges is that transmitting terminal is gone here and there the serial data information flow of input change, each time slot sends log
2n
g+ N
tbit information, front log
2n
gbit is determined the LED lamp group of transmission information, and spatial modulation between realization group, by the positional information transmission of selected LED lamp group; Rear N
tbit first passes through sign map, then parallel transmission in the LED lamp group of choosing, spatial reuse in realization group.
The indoor visible ray MIMO transmission plan of described combination spatial modulation and space multiplexing technique, described arrange receive detection scheme be that receiving terminal utilizes the glossary of symbols that channel training obtains to carry out to received signal Maximum Likelihood Detection, determine the LED lamp group of transmission information, obtain the log that between group, spatial modulation is carried
2n
gbit position information, the channel condition information of the corresponding LED lamp group then obtaining according to channel estimation, adopts Space Solutions multiplexing algorithm, solves the N in group
tbit space multiplexed information, then recover original bit information flow through parallel-serial conversion.
The invention has the beneficial effects as follows: the present invention is the MIMO transmission plan of a kind of combination spatial modulation and space multiplexing technique, comparing conventional method tool has the following advantages: it is enough large that a. makes to organize interior LED lamp spacing by the grouping of LED lamp, correlation in group between LED lamp is relatively little, can adopt SMP technology, improve spatial reuse gain; B. between group, adopt SM technology, single time slot only has a LED lamp group to send information, has avoided the LED lamp that correlation is stronger to produce phase mutual interference; C. between LED lamp group of the present invention, adopt SM technology, in group, adopt SMP technology, can realize log
2n
g+ N
tspatial reuse gain, higher than single employing SMP or SM technology.Transmitting terminal and receiving terminal do not need to increase specific device yet simultaneously, are easy to realize, with low cost.
Brief description of the drawings
Fig. 1 is LED lamp grouping scheme of the present invention;
Fig. 2 is delivery plan of the present invention;
Fig. 3 is reception programme of the present invention;
In figure, LED group 1 is for 1. 5. 9.
, LED group 2 is for 2. 6. 10.
, LED group 3 is for 3. 7.
, LED group 4 is for 4. 8.
.
Embodiment
Embodiment 1, in conjunction with Fig. 1-Fig. 3, cause by force for indoor VLC mimo channel correlation the problem that spatial reuse is low, the present invention proposes the MIMO transmission method of a kind of combination SM and SMP technology, the method is divided into groups to LED lamp, group forming criterion is that the LED lamp minimum spacing in group is enough large, can adopt SMP technology.Intra class correlation is multiplexing with implementation space compared with I like this, and inter-class correlation is larger, adopts SM technology.Can realize like this (log
2n
g+ N
t) spatial reuse gain, higher than single employings SMP or SM technology, can effectively improve the spatial reuse gain of indoor VLC mimo system, the transmission rate of raising system.It is characterized in that comprising following content: enough greatly can implementation space be multiplexed with to organize interior LED lamp minimum spacing principle the grouping of LED lamp, avoid SM technology between the group of phase mutual interference between group, improve SMP technology in the group of spatial reuse gain.
Below in conjunction with accompanying drawing, the invention will be further described.The present invention is divided into groups, is carried out channel training, delivery plan is set and reception programme four parts are set forming by LED lamp.
Step 1, LED lamp is divided into groups, note grouping number is N
g, every group comprises N
tindividual LED lamp, N
t=N/N
g.Group forming criterion is that the LED lamp minimum spacing in group is enough large, can adopt SMP technology, and N
t≤ M.Such as in the indoor ceiling of 5m × 5m, there are 4 LED array, each LED array comprises 4 LED lamps, as shown in Figure 1.LED array spacing is large (2.5m), and the LED lamp correlation in different LED array is less, the LED lamp spacing less (0.2m) in same LED array, and correlation is stronger.Note receiver comprises 4 PD.Consider LED lamp group forming criterion, 16 LED lamps can be divided into 4 groups, 1,5,9,13 signal lamps are the 1st group, and 2,6,10,14 signal lamps are the 2nd group, and 3,7,11,15 signal lamps are the 3rd group, and 4,8,12,16 signal lamps are the 4th group.The spacing that so just can ensure LED lamp in each LED lamp group is 2.5m, can adopt SMP technology.
Step 2, carry out channel training, each LED lamp group sends respectively training sequence, and receiving terminal obtains the symbol y that receives each LED lamp group and send information
1, y
2, L,
, the glossary of symbols while detection as maximum likelihood (ML); Channel condition information H when estimating each group of LED lamp simultaneously and sending respectively
1, H
2, L,
, receiving terminal estimates and sends after LED lamp group, can utilize corresponding channel matrix to solve multiplexed information in group.In the example shown in Fig. 1,4 LED lamp groups send respectively training sequence, and receiver obtains sending glossary of symbols { y
1, y
2, y
3, y
4, corresponding channel matrix H when estimating 4 LED lamp groups simultaneously and sending respectively
1, H
2, H
3, H
4.
Step 3, delivery plan is set, adopts OOK modulation, transmitting terminal is gone here and there the bit stream of input change, and each time slot sends (log
2n
g+ N
t) individual bit.Front log
2n
gbit is determined the LED lamp group of transmission information, spatial modulation between realization group; Rear N
tbit is parallel transmission in the LED lamp group of choosing, spatial reuse in realization group.In the example shown in Fig. 1,4 LED lamp groups, each time slot portability 2 bit position information, set up mapping relations: " 00 " corresponding LED lamp group 1 transmission information, " 01 " corresponding LED lamp group 2 transmission information, " 11 " corresponding LED lamp group 3 transmission information, " 10 " corresponding LED lamp group 4 transmission information.Each LED lamp group comprises 4 LED lamps, and each time slot can send 4 bit multiplexed informations, and " 0 " is mapped as " I
0", " 1 " is mapped as " I
1", each time slot can transmit 6 bit informations.Suppose that bit stream is for " 100110 ", delivery plan as shown in Figure 2." 10 " are mapped as LED lamp group 4 transmission information, and " 1001 " are first mapped as " I
1i
0i
0i
1", and then parallel transmission on 4,8,12,16 signal lamps, implementation space is multiplexing.
Step 4, reception programme is set, the glossary of symbols { y that receiving terminal utilizes channel training to obtain
1, y
2, L,
to received signal y carry out ML detection, determine the LED lamp group of transmission information, obtain the log that between group, spatial modulation is carried
2n
gbit position information; The channel condition information of the corresponding LED lamp group then obtaining according to channel estimating, adopts Space Solutions multiplexing algorithm to solve the N in group
tbit space multiplexed information, as shown in Figure 3.In the example shown in Fig. 1, first receiving terminal utilizes glossary of symbols { y
1, y
2, y
3, y
4, adopt ML algorithm to detect as LED lamp group 4 transmission information, obtain " 10 "; Then according to the channel matrix H of LED lamp group 4 correspondences
4, adopt Space Solutions multiplexing algorithm, solve multiplexed information " 1001 " in group.
Claims (5)
1. in conjunction with an indoor visible ray MIMO transmission plan for spatial modulation and space multiplexing technique, it is characterized in that: the LED lamp number of remembering indoor visible light communication mimo system is N, and the number of photoelectric detector is M, and this transmission method comprises the following steps:
(1) LED lamp is divided into groups;
(2) carry out channel training;
(3) delivery plan is set;
(4) reception detection scheme is set.
2. the indoor visible ray MIMO transmission plan of combination spatial modulation according to claim 1 and space multiplexing technique, is characterized in that: described by LED be grouped into note grouping number be N
g, every group comprises N
tindividual LED lamp, N
t=N/N
g; The minimum lamp of the LED lamp in group is apart from the demand of meeting spatial multiplex technique, and N
t≤ M.
3. the indoor visible ray MIMO transmission plan of combination spatial modulation according to claim 1 and space multiplexing technique, it is characterized in that: described in to carry out channel training be that each LED lamp group sends respectively training sequence, symbol when the each LED lamp group of receiving terminal acquisition reception sends information separately, the glossary of symbols during as Maximum Likelihood Detection; Channel condition information when estimating each group of LED lamp simultaneously and sending respectively, receiving terminal estimates and sends after LED lamp group, utilizes corresponding channel condition information to solve multiplexed information in group.
4. the indoor visible ray MIMO transmission plan of combination spatial modulation according to claim 1 and space multiplexing technique, is characterized in that: the described delivery plan that arranges is that transmitting terminal is gone here and there the serial data information flow of input change, and each time slot sends log
2n
g+ N
tbit information, front log
2n
gbit is determined the LED lamp group of transmission information, and spatial modulation between realization group, by the positional information transmission of selected LED lamp group; Rear N
tbit first passes through sign map, then parallel transmission in the LED lamp group of choosing, spatial reuse in realization group.
5. the indoor visible ray MIMO transmission plan of combination spatial modulation according to claim 1 and space multiplexing technique, it is characterized in that: described arrange receive detection scheme be that receiving terminal utilizes the glossary of symbols that channel training obtains to carry out to received signal Maximum Likelihood Detection, determine the LED lamp group of transmission information, obtain the log that between group, spatial modulation is carried
2n
gbit position information, the channel condition information of the corresponding LED lamp group then obtaining according to channel estimating, adopts Space Solutions multiplexing algorithm, solves the N in group
tbit space multiplexed information, then recover original bit information flow through parallel-serial conversion.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104811245A (en) * | 2015-04-29 | 2015-07-29 | 广东顺德中山大学卡内基梅隆大学国际联合研究院 | Visible light communication method combining color gamut modulation with spatial modulation |
| CN105515658A (en) * | 2015-11-24 | 2016-04-20 | 广东顺德中山大学卡内基梅隆大学国际联合研究院 | Precoded MIMO-OOFDM visible light communication method |
| CN105939177A (en) * | 2016-03-10 | 2016-09-14 | 兰州理工大学 | Multipath fading channel modeling method of indoor visible light MIMO communication system |
| CN105959050A (en) * | 2016-06-08 | 2016-09-21 | 华北电力大学（保定） | Quaternary differential spatial modulation method |
| CN106027207A (en) * | 2016-05-27 | 2016-10-12 | 华北电力大学（保定） | Differential spatial modulation method |
| CN106130631A (en) * | 2016-06-24 | 2016-11-16 | 中国人民解放军信息工程大学 | A kind of visible light communication device |
| CN106357332A (en) * | 2016-10-20 | 2017-01-25 | 东南大学 | Multi-input-multi-output visible light communication system |
| CN108494485A (en) * | 2018-04-09 | 2018-09-04 | 山东大学 | The mapping method of generalized space modulation spectrum efficiency in a kind of raising visible light communication |
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2014
- 2014-06-06 CN CN201410249388.9A patent/CN104092518A/en active Pending
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104811245A (en) * | 2015-04-29 | 2015-07-29 | 广东顺德中山大学卡内基梅隆大学国际联合研究院 | Visible light communication method combining color gamut modulation with spatial modulation |
| CN104811245B (en) * | 2015-04-29 | 2018-05-15 | 广东顺德中山大学卡内基梅隆大学国际联合研究院 | It is a kind of to combine colour gamut and the visible light communication method of spatial domain modulation |
| CN105515658A (en) * | 2015-11-24 | 2016-04-20 | 广东顺德中山大学卡内基梅隆大学国际联合研究院 | Precoded MIMO-OOFDM visible light communication method |
| CN105939177A (en) * | 2016-03-10 | 2016-09-14 | 兰州理工大学 | Multipath fading channel modeling method of indoor visible light MIMO communication system |
| CN105939177B (en) * | 2016-03-10 | 2018-10-23 | 兰州理工大学 | Indoor visible light MIMO communication system multidiameter fading channel modeling method |
| CN106027207B (en) * | 2016-05-27 | 2018-12-21 | 华北电力大学（保定） | A kind of difference modulating method |
| CN106027207A (en) * | 2016-05-27 | 2016-10-12 | 华北电力大学（保定） | Differential spatial modulation method |
| CN105959050A (en) * | 2016-06-08 | 2016-09-21 | 华北电力大学（保定） | Quaternary differential spatial modulation method |
| CN105959050B (en) * | 2016-06-08 | 2019-04-19 | 华北电力大学（保定） | A kind of quaternary difference modulating method |
| CN106130631A (en) * | 2016-06-24 | 2016-11-16 | 中国人民解放军信息工程大学 | A kind of visible light communication device |
| CN106130631B (en) * | 2016-06-24 | 2019-02-19 | 中国人民解放军信息工程大学 | A kind of visible light communication device |
| CN106357332A (en) * | 2016-10-20 | 2017-01-25 | 东南大学 | Multi-input-multi-output visible light communication system |
| CN106357332B (en) * | 2016-10-20 | 2018-08-17 | 东南大学 | A kind of multiple-input and multiple-output visible light communication system |
| CN108494485A (en) * | 2018-04-09 | 2018-09-04 | 山东大学 | The mapping method of generalized space modulation spectrum efficiency in a kind of raising visible light communication |
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