CN106330310B - A kind of light OFDM method of three road signal of simultaneous transmission - Google Patents
A kind of light OFDM method of three road signal of simultaneous transmission Download PDFInfo
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- CN106330310B CN106330310B CN201610747392.7A CN201610747392A CN106330310B CN 106330310 B CN106330310 B CN 106330310B CN 201610747392 A CN201610747392 A CN 201610747392A CN 106330310 B CN106330310 B CN 106330310B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
- H04B10/114—Indoor or close-range type systems
- H04B10/116—Visible light communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/5161—Combination of different modulation schemes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2697—Multicarrier modulation systems in combination with other modulation techniques
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Abstract
The invention discloses a kind of light OFDM methods of three road signal of simultaneous transmission, it is characterized by: transmitting terminal is sequentially overlapped ACO-OFDM signal and DCO-OFDM signal on the signal of traditional PAM-DMT, receiving end successively detects PAM-DMT, ACO-OFDM and DCO-OFDM signal using the interference relationships between three road signals, thus transmission while realizing tri- road signal of PAM-DMT, ACO-OFDM and DCO-OFDM.This method takes full advantage of the carrier resource of light OFDM, improves the availability of frequency spectrum of system, while only needing that less direct current is added, and good trade-off is realized between spectrum efficiency and power efficiency.
Description
Technical field
The present invention is to realize light orthogonal frequency division multiplexing (the Orthogonal Frequency of three road signal simultaneous transmissions
Division Multiplexing, OFDM) scheme, belong to technical field of visible light communication.
Background technique
The final goal of wireless communication technique be allow people can in any place any time and anyone carry out it is any
The communication of content (voice, video), the continuous development of the communication technology keep this target more and more closer from us.Existing mobile electricity
The communication system equipments such as telephone system and WLAN (Wireless Local Area Networks, WLAN) router are basic
All using the electromagnetic wave of radio frequency band as signal vehicle.But the frequency spectrum resource of radio is limited, as people are to nothing
The raising of line required communication rate, existing frequency spectrum resource are gradually unable to meet demand.Show channel radio at present according to statistics
The annual growth of letter data has reached 80%, and the annual growth of the availability of frequency spectrum is only 12%.So go down, frequency spectrum resource will
As the factor for restricting Development of Wireless Communications, there is an urgent need to find new communication by people.Due to green energy conservation, it is not necessarily to
The advantages that frequency spectrum planning, transmission rate height and good confidentiality, it is seen that optical communication technique is counted as a kind of important indoor communications
Soverlay technique.
It is detected due to visible light communication system using intensity modulated and directly, therefore it is required that the signal sent must be non-negative
's.In order to meet the requirement of signal nonnegativity, there are mainly three types of basic light OFDM schemes at this stage: direct current biasing light OFDM
(direct current biased optical OFDM, DCO-OFDM), asymmetric clipping light OFDM (asymmetrically
Clipped optical OFDM, ACO-OFDM) and impulse amplitude Discrete Multitone modulation (pulse-amplitude-
Modulated discrete multitone, PAM-DMT) etc..DCO-OFDM is by way of adding direct current biasing negative value
Waveform is raised, and ensure that signal is non-negative, its advantage is that structure is simple, but the disadvantage is that power overhead is larger.ACO-OFDM and PAM-
DMT guarantees that signal is non-negative by clipping, but due to the influence of clipped noise, can only achieve the frequency spectrum effect of DCO-OFDM half
Rate.In order to promote the spectrum efficiency of optical OFDM system, the power efficiency of system is combined, proposes new light OFDM transmission scheme
Very it is necessary to.
Summary of the invention
Goal of the invention: the purpose of the present invention is in view of the deficiencies of the prior art, propose a kind of three road signal of simultaneous transmission
Light OFDM scheme, the program improve the spectrum efficiency of optical OFDM system under the premise of only needing that less direct current is added, are being
Good trade-off is realized between the spectrum efficiency and power efficiency of system.
Technical solution: to achieve the above object, The technical solution adopted by the invention is as follows:
A kind of light OFDM method of three road signal of simultaneous transmission, comprising the following steps:
(1) transmitting terminal is sent after merging PAM-DMT, ACO-OFDM and DCO-OFDM signal；
(2) light signal strength received is detected in receiving end, successively detects PAM- using the interference relationships between three road signals
DMT, ACO-OFDM and DCO-OFDM signal.
Further, the step (1) specifically includes:
(1.1) original SERIAL BINARY DATA is divided into parallel three data, every circuit-switched data bit by serial/parallel conversion
Specific proportionate relationship by three data carry out constellation mapping constellation order determine；
(1.2) M is carried out to the first circuit-switched datapamThen rank PAM constellation mapping carries out PAM-DMT modulation；MpamFor greater than 1
Positive integer；
(1.3) M is carried out to the second circuit-switched dataacoRank PAM constellation mapping, is then placed on the real part of odd subcarriers, carries out
ACO-OFDM modulation；MacoFor the positive integer greater than 1；
(1.4) M is carried out to third circuit-switched datadcoRank PAM constellation mapping, is then placed on the real part of even subcarriers, carries out
DCO-OFDM modulation；MdcoFor the positive integer greater than 1；
(1.5) PAM-DMT, ACO-OFDM that modulation obtains are added merging with tri- road signal of DCO-OFDM, to what is obtained
Time-domain signal adds cyclic prefix, does that send after digital-to-analogue conversion to LED lamp be that optical signal is sent.
Further, the step (2) specifically includes:
(2.1) light signal strength received is detected in receiving end, and to receiving, signal analog-to-digital conversion, removal cyclic prefix are (i.e. fixed
When it is synchronous), obtain discrete sampling sequence signal；
(2.2) this signal is the superposition of three road signals, can directly carry out PAM-DMT demodulation to this sequence, detect PAM-
The data of DMT branch；
(2.3) according to the demodulation result of PAM-DMT branch in step (2.2), PAM-DMT signal is rebuild, from reception signal
In subtract, obtained signal is ACO-OFDM signal to be superimposed with DCO-OFDM signal；
(2.4) ACO-OFDM demodulation is directly carried out to the signal that step (2.3) obtains, detects the number of ACO-OFDM branch
According to；
(2.5) according to the demodulation result of ACO-OFDM signal in step (2.4), ACO-OFDM signal is rebuild, from step
(2.3) it is subtracted in the signal obtained, obtains simple DCO-OFDM signal；
(2.6) DCO-OFDM demodulation is carried out to the signal that step (2.5) obtains, detects the data of DCO-OFDM branch.
Using the testing result of step (2), receiving end further promotes detection performance by way of iterative interference cancellation,
Specifically includes the following steps:
(3.1) according to the testing result of existing ACO-OFDM and DCO-OFDM branch, ACO-OFDM and DCO- is rebuild
Ofdm signal subtracts from reception signal respectively, obtains simple PAM-DMT signal；
(3.2) after the signal obtained to step (3.1) is pairwise clipping, PAM-DMT demodulation, detection are carried out
The data of PAM-DMT branch out；
(3.3) according to the testing result of existing PAM-DMT and DCO-OFDM branch, PAM-DMT and DCO-OFDM is rebuild
Signal subtracts from reception signal respectively, obtains simple ACO-OFDM signal；
(3.4) after the signal obtained to step (3.3) is pairwise clipping, ACO-OFDM demodulation, detection are carried out
The data of ACO-OFDM branch out；
(3.5) according to the testing result of existing PAM-DMT and ACO-OFDM branch, PAM-DMT and ACO-OFDM is rebuild
Signal subtracts from reception signal respectively, obtains simple DCO-OFDM signal；
(3.6) DCO-OFDM demodulation is carried out to the signal that step (3.5) obtains, detects the data of DCO-OFDM branch.
The utility model has the advantages that compared with prior art, smooth OFDM transmission method proposed by the present invention takes full advantage of light OFDM's
Carrier resource improves the availability of frequency spectrum of system, while only needing that less direct current is added, and has in spectrum efficiency and power
Good trade-off is realized between effect property.
Detailed description of the invention
Fig. 1 is system transmitting terminal and receiving end block diagram.
Specific embodiment
In order to enable those skilled in the art to better understand the solution of the present invention, below in conjunction with embodiment in the present invention
Technical solution carry out clear, complete description, it is clear that the described embodiments are merely a part of the embodiments of the present invention, and
The embodiment being not all of.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work
Under the premise of every other embodiment obtained, should fall within the scope of the present invention.
The embodiment of the invention discloses a kind of light OFDM schemes of three road signal of simultaneous transmission.As shown in Figure 1, it is contemplated that
There is N number of carrier wave in one ofdm system, it is assumed that communication channel is additive white Gaussian noise channel.The method master of the embodiment of the present invention
Include the following steps:
(1) transmitting terminal is sent after merging PAM-DMT, ACO-OFDM and DCO-OFDM signal.Including for following steps:
Step 1: original SERIAL BINARY DATA bit is divided into parallel three data, every number by serial/parallel conversion
It is determined according to the specific proportionate relationship of bit by the constellation order that three data carries out constellation mapping；
Step 2: carrying out M to the first circuit-switched datapamThen rank PAM constellation mapping carries out PAM-DMT modulation；
Step 3: carrying out M to the second circuit-switched dataacoRank PAM constellation mapping, is then placed on the real part of odd subcarriers, into
Row ACO-OFDM modulation；
Step 4: carrying out M to third circuit-switched datadcoRank PAM constellation mapping, is then placed on the real part of even subcarriers, into
Row DCO-OFDM modulation；
Step 5: PAM-DMT, ACO-OFDM are added merging with tri- road signal of DCO-OFDM, to obtained time-domain signal
Add cyclic prefix, does that send after digital-to-analogue conversion to LED lamp be that optical signal is sent.
(2) light signal strength received is detected in receiving end, successively detects PAM- using the interference relationships between three road signals
DMT, ACO-OFDM and DCO-OFDM signal.The following steps are included:
Step 1: the light signal strength received is detected in receiving end, (i.e. to reception signal analog-to-digital conversion, removal cyclic prefix
Timing Synchronization), obtain discrete sampling sequence signal；
Step 2: this signal is the superposition of three road signals, PAM-DMT demodulation can be directly carried out to this sequence, detected
The data of PAM-DMT branch；
Step 3: PAM-DMT signal is rebuild according to the demodulation result of PAM-DMT branch in second step, from reception signal
It subtracts, obtained signal is ACO-OFDM signal to be superimposed with DCO-OFDM signal；
Step 4: directly carrying out ACO-OFDM demodulation to the signal that third step obtains, the number of ACO-OFDM branch is detected
According to；
Step 5: rebuilding ACO-OFDM signal according to the demodulation result of ACO-OFDM signal in the 4th step, being obtained from third step
To signal in subtract, obtain simple DCO-OFDM signal；
Step 6: carrying out DCO-OFDM demodulation to the signal that the 5th step obtains, the data of DCO-OFDM branch are detected.
(3) testing result for utilizing step (2), further promotes detection performance in a manner of iterative interference cancellation.Including
Following steps:
Step 1: rebuilding ACO-OFDM and DCO- according to the testing result of existing ACO-OFDM and DCO-OFDM branch
Ofdm signal subtracts from reception signal respectively, obtains simple PAM-DMT signal；
Step 2: carrying out PAM-DMT demodulation after being pairwise clipping to the signal that the first step obtains, detecting
The data of PAM-DMT branch；
Step 3: rebuilding PAM-DMT and DCO- according to the testing result of existing PAM-DMT and DCO-OFDM branch
Ofdm signal subtracts from reception signal respectively, obtains simple ACO-OFDM signal；
Step 4: carrying out ACO-OFDM demodulation, detection after being pairwise clipping to the signal that third step obtains
The data of ACO-OFDM branch out；
Step 5: rebuilding PAM-DMT and ACO- according to the testing result of existing PAM-DMT and ACO-OFDM branch
Ofdm signal subtracts from reception signal respectively, obtains simple DCO-OFDM signal；
Step 6: carrying out DCO-OFDM demodulation to the signal that the 5th step obtains, the data of DCO-OFDM branch are detected.
Although the present invention has been disclosed as a preferred embodiment, however, it is not to limit the invention.Skill belonging to the present invention
Has usually intellectual in art field, without departing from the spirit and scope of the present invention, when can be used for a variety of modifications and variations.Cause
This, the scope of protection of the present invention is defined by those of the claims.
Claims (2)
1. a kind of light OFDM method of three road signal of simultaneous transmission, which comprises the following steps:
(1) transmitting terminal is sent after merging PAM-DMT, ACO-OFDM and DCO-OFDM signal；Specifically includes the following steps:
(1.1) original SERIAL BINARY DATA is divided into parallel three data, the tool of every circuit-switched data bit by serial/parallel conversion
Body proportionate relationship is determined by the constellation order that three data carries out constellation mapping；
(1.2) M is carried out to the first circuit-switched datapamThen rank PAM constellation mapping carries out PAM-DMT modulation；MpamFor just greater than 1
Integer；
(1.3) M is carried out to the second circuit-switched dataacoRank PAM constellation mapping, is then placed on the real part of odd subcarriers, carries out ACO-
OFDM modulation；MacoFor the positive integer greater than 1；
(1.4) M is carried out to third circuit-switched datadcoRank PAM constellation mapping, is then placed on the real part of even subcarriers, carries out DCO-
OFDM modulation；MdcoFor the positive integer greater than 1；
(1.5) PAM-DMT, ACO-OFDM that modulation obtains are added merging with tri- road signal of DCO-OFDM, to obtained time domain
Signal adds cyclic prefix, does that send after digital-to-analogue conversion to LED lamp be that optical signal is sent；
(2) light signal strength that receives is detected in receiving end, using the interference relationships between three road signals successively detect PAM-DMT,
ACO-OFDM and DCO-OFDM signal；Specifically includes the following steps:
(2.1) light signal strength received is detected in receiving end, and to signal analog-to-digital conversion, removal cyclic prefix is received, i.e. timing is same
Step, obtains discrete sampling sequence signal；
(2.2) signal obtained in step (2.1) is the superposition of three road signals, directly carries out PAM-DMT demodulation to this sequence, is examined
Measure the data of PAM-DMT branch；
(2.3) according to the demodulation result of PAM-DMT branch in step (2.2), PAM-DMT signal is rebuild, is subtracted from receiving in signal
It goes, obtained signal is ACO-OFDM signal to be superimposed with DCO-OFDM signal；
(2.4) ACO-OFDM demodulation is directly carried out to the signal that step (2.3) obtains, detects the data of ACO-OFDM branch；
(2.5) according to the demodulation result of ACO-OFDM signal in step (2.4), ACO-OFDM signal is rebuild, is obtained from step (2.3)
To signal in subtract, obtain simple DCO-OFDM signal；
(2.6) DCO-OFDM demodulation is carried out to the signal that step (2.5) obtains, detects the data of DCO-OFDM branch.
2. the light OFDM method of three road signal of simultaneous transmission according to claim 1, which is characterized in that utilize step (2)
Testing result, receiving end further promotes detection performance by way of iterative interference cancellation, specifically includes the following steps:
(3.1) according to the testing result of existing ACO-OFDM and DCO-OFDM branch, ACO-OFDM and DCO-OFDM letter is rebuild
Number, it is subtracted from reception signal respectively, obtains simple PAM-DMT signal；
(3.2) after the signal obtained to step (3.1) is pairwise clipping, PAM-DMT demodulation is carried out, is detected
The data of PAM-DMT branch；
(3.3) according to the testing result of existing PAM-DMT and DCO-OFDM branch, PAM-DMT and DCO-OFDM signal is rebuild,
It is subtracted from reception signal respectively, obtains simple ACO-OFDM signal；
(3.4) after the signal obtained to step (3.3) is pairwise clipping, ACO-OFDM demodulation is carried out, is detected
The data of ACO-OFDM branch；
(3.5) according to the testing result of existing PAM-DMT and ACO-OFDM branch, PAM-DMT and ACO-OFDM signal is rebuild,
It is subtracted from reception signal respectively, obtains simple DCO-OFDM signal；
(3.6) DCO-OFDM demodulation is carried out to the signal that step (3.5) obtains, detects the data of DCO-OFDM branch.
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| CN107181531B (en) * | 2017-05-22 | 2019-05-07 | 南京邮电大学 | Bit mapping method when LED number is any in light spatial modulation communication system |
| CN106992814B (en) * | 2017-06-02 | 2019-05-28 | 东南大学 | A kind of visible light multi-carrier communications systems transmitter design method based on distributed multiple light courcess |
| CN107395274B (en) * | 2017-06-13 | 2019-06-18 | 东南大学 | A kind of implementation method of DCO-OFDM visible light communication Transmission system |
| CN107612618B (en) * | 2017-09-28 | 2019-11-15 | 天津大学 | One kind being based on the novel hybrid modulation method of visible light communication |
| CN115173953B (en) * | 2022-07-01 | 2024-04-02 | 桂林电子科技大学 | Method for improving hybrid HACO-OFDM performance by using predistortion technology |
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