VISIBLE LIGHT COMMUNICATION APPARATUS BASED ON FREQUENCY DIVISION MULTIPLEXING

The present invention refers to various modification may have various can apply in the embodiment which is, in the embodiment example drawing it through detailed description specific to the broadcast receiver. However, the present invention is defined with respect to a particular embodiment form which are not included, all changing range of idea and techniques of the present invention, including the water to replacement should understood to evenly. In describing the present invention, publicly known technique related description is the specific subject matter of invention description if breach of haze can be decided to be supplied from a substrate. In addition, backing representation can be used in the specification and claim, alternatively referred to will not generally interpreted meaning "one or more" should.

Hereinafter, with reference to the accompanying drawing which is a detailed to explain a of the present invention preferred embodiment, with reference to the attached drawing through a browser is connected to, the same or corresponding components and the same drawing number local description dispensed the on-sensors other.

Frequency division multiplexing based visible optical communication techniques are disclosure. Hereinafter, to aid in the understanding of the present invention, frequency division multiplexing one type of orthogonal frequency division multiplexing example, described as follows. In addition, in the present invention number visible optical communication technology based on a frequency division multiplexing-in general frequency division multiplexing communication techniques for the ancestor Ziegler, general frequency division multiplexed communication technique first introduced substrate.

One line of the plurality of frequency bands by using frequency division multiplexed manner, among multiple carrier orthogonal frequency division multiplexing (Orthogonal frequency a-division multiplexing, OFDM) how the digital encoded data (multiple carrier frequencies) are disclosed. Orthogonal frequency division multiplexing (Coded OFDM) (discrete multi-a tone modulation) coded orthogonal frequency division multiplexing scheme on DMT and essentially equal, digital multicarrier modulation (digital multi-a carrier modulation method) methodology of liquefied a frequency division multiplexing (frequency a-division multiplexing, FDM) are disclosed. Several parallel data streams or channels orthogonal frequency division multiplexing in a plurality of close interval for transmitting data via a signal orthogonal subcarrier (orthogonal sub a-carrier) are used. Each subcarrier (quadrature amplitude modulation, QAM) or quadrature amplitude modulation such as phase shift keyed (phase-a shift keying, PSK) traditional modulation schemes (symbol rate) and modulated at low symbol rate, traditional single carrier (single-a carrier) modulation schemes such as bandwidth similar holds the total data rates. A primary reason for the more efficient compared to single carrier scheme OFDM transmission filter micron channel environment without complex (e.g., a copper wire in high frequency attenuation, the narrowband interference and multipath by frequency selective fading) that are emitted from the are disclosed. Channel number shaving cutter is then can be simple [khwel[khwel] (Channel equalization) therefore fallen short of OFDM modulated one wideband signal modulated plurality of narrow-band signal can be gentle instead if the are disclosed. Low symbol rate between symbols maintain appropriate guard interval (guard interval) is permitted by the substrate. A number through intersymbol interference (Inter Symbol Interference, ISI) can be a stand-alone, on echo time non-spreading (analog TV ghosting and blur shown respectively by) (diversity gain) utilizing a diversity gain, i.e. signal to noise ratio (signal provided to a non-noise ratio, SNR) in addition can be improve. Further, the mechanism of rebuilding an existing single carrier real sent from various transmitters and distance occurring interference prevented by construction is coupled to the signal, a signal transmitter is simultaneously the same frequency adjacent various current fed to a design of a single frequency networks (single frequency networks, SFNs) causes more for hereinafter.

Figure 1 shows a frequency division multiplexing communication device block generally are disclosed.

The reference also 1, orthogonal frequency division multiplexing based transmission device (110) and quadrature frequency division multiplexing based receiving device (120) is shown disclosed.

Transmission device (110) includes a coding (coding) module, interleaving (Interleaving) module, QAM mapping (QAM (Quadrature Amplitude Modulation) mapping) module, pilot insertion (Pilot insertion) module, parallel module (serial to parallel), IFFT (inverse Fast Fourier transform) Module, serialization (parallel to serial) module, DAC module and RF transmission (RF TX) module substrate.

Coding module includes a wants to transmit data transmission device (110) is transmitted scanning data converter. Interleaving module includes a data transmission error occurs if the first data packet unit rearrangement of populations nephrophathy error recovery error is generated. QAM OFDM subcarrier mapping module may each data pattern according having assigned to each other. Pilot insertion module may focused to recovery at a receiving end in response to accurate signal, signal informing a start of a transmits a pilot signal data to be inserted into. Series form of parallel module into parallel data converter. IFFT module is in the frequency domain to a time domain signal representing the composite data points of a point number of the same converter. The nibble into Serial data serialization module parallel form of converter. DAC module includes a digital signal into an analog signal converter. Finally the transmission module transmits the analog signal RF signal.

Receiving device (120) is received RF (RF RX) module, ADC module, parallel module, FFT (Fast Fourier transform) Module, serialization module, channel correction (Channel correction) module, QAM demapping (QAM demapping) module, deinterleaving (Deinterleaving) module and decoding module comprises.

Transmission device RF receiving module (110) receives a signal transmitted from. ADC module provides an analog signal into a digital signal converter. Series form of parallel module into parallel data converter. FFT module is a time domain signal into signals of frequency domain converter. Parallel module Serial data into parallel data converter. Serialization module Serial data into parallel data converter. Channel correction module includes a channel number [syen[syen][khwel[khwel] orthogonality signals a plurality of hierarchies. Extracted data from QAM demapping module includes a QAM signal. Deinterleaving module error state re-arranged in the data arrangement restored to original data head toward each other. Decoding (Decoding) module includes a data form of data won recover substrate.

Figure 2 shows a device of the present invention also one in the embodiment according to orthogonal frequency division multiplexing based visible light communication block are disclosed.

The reference 2 also, orthogonal frequency division multiplexing based visible optical communication transmission device (210) and receiving device (220) is shown disclosed.

Visible optical communication transmission device (210) is a processing section (211), modulation section (212) and transmission (213) having a predetermined wavelength.

Processing section (211) or a generates a transmission data to be input, the input data to the converter in a form capable of day three.

As one example, processing section (211) is coding (coding) module, interleaving (Interleaving) module, QAM mapping (QAM mapping) module, pilot insertion (Pilot insertion) module and parallel module can be. Coding module includes a wants to transmit data transmission device (110) is transmitted scanning data converter. Interleaving module includes a data transmission error occurs if the first data packet unit rearrangement of populations nephrophathy error recovery error is generated. QAM OFDM subcarrier mapping module may each data pattern according having assigned to each other. Pilot insertion module may focused to recovery at a receiving end in response to accurate signal, signal informing a start of a transmits a pilot signal data to be inserted into. Series form of parallel module into parallel data converter. In one example, be a day three Serial data is parallel data.

Modulation section (212) is each day three subcarrier based on modulating substrate. Transferring the at least one subcarrier for transmitting a day three, day three subcarrier based on modulating substrate. As one example, modulation section (210) is delay (delay) and quadrature subcarrier multiplexing module comprising a module number (orthogonal sub-a carrier multiplier) can be. The module comprises a plurality of visible light signals to be transmitted through each transmission module delay number adjusting delays between each other. I.e., the module comprises a plurality of visible optical communication transmission module configured delay number received at receiving device when optical signals to be transmitted, by receiving a signal to a signal of Figure 1 IFFT, S. adjusting delays of each of the signals. Parallel orthogonal subcarrier multiplexing module is mixed with data carriers produce a transmit signal.

Transmission unit (213) is separate visible optical communication transmission module transmits the modulated sub-carriers each. In one example, transmission unit (213) DAC module and optical transmission module comprises a plurality of prong can be. The LED can be composed of visible optical communication transmission module.

Visible optical communication receiving device (220) includes a visible optical communication reception module (PD RX), ADC module, parallel module, FFT (Fast Fourier transform) Module, serialization module, channel correction (Channel correction) module, QAM demapping (QAM demapping) module, deinterleaving (Deinterleaving) module and decoding module comprises.

Transmission device visible optical communication reception module (210) receives a signal transmitted from. ADC module provides an analog signal into a digital signal converter. Series form of parallel module into parallel data converter. FFT module is a time domain signal into signals of frequency domain converter. Parallel module Serial data into parallel data converter. Serialization module Serial data into parallel data converter. Channel correction module includes a channel number [syen[syen][khwel[khwel] orthogonality signals a plurality of hierarchies. Extracted data from QAM demapping module includes a QAM signal. Deinterleaving module error state re-arranged in the data arrangement restored to original data head toward each other. Decoding (Decoding) module includes a data form of data won recover substrate.

Figure 3 shows a delay adjusting device of the present invention also included one in the embodiment according to block visible optical communication transmission are disclosed.

The reference also 3, visible optical communication transmission device includes a delay adjustment unit (300) having a predetermined wavelength. Delay adjustment unit (300) through respective visible optical communication transmission module generates delay number between delay control signal for signals to be transmitted from the intermediate module, in one example, delay adjustment unit (300) comprises a plurality of visible optical communication reception module (310) and delay calculation module (320) can be comprising.

Plurality of barbs optical communication reception module (310) for respectively receiving the signals to be transmitted from each visible light communication transmission module, received signal to an analog to digital converter.

Delay calculation module (320) each visible optical communication reception module (310) analyze signals received at each visible optical communication transmission module to delay for a signal received from a module delivers the delay number is stored. Thus, the optical transmission device visible in visible optical communication transmission module of signals transmitted via the feedback, in accordance with the more accurate than delay adjustment.

Figure 5 shows a color frequency division multiplexing scheme of the present invention 4 and also one in the embodiment according to account for visible optical communication surface also are disclosed.

Color frequency splitting multiplexing (color FDM) is obtained using a frequency band of visible optical cross each other visible optical communication signal outputted by big. The reference also 4, color frequency division multiplexing based visible optical communication transmission device (410) and receiving device (420) is in the nanometer range. Hereinafter, to omit redundant portion of description is also 2 and described as follows.

Visible optical communication transmission device (410) unit of (411) is different colors which describes the frequency by using the optical transmission module comprises a visible region. In one example, optical transmission module is visible red filter (R), green (G), blue (B) color gamut using a frequency can be. Transmission unit (411) is a modulated carrier wave to each visible optical communication transmission module transmits the.

Visible optical communication receiving device (420) for receiving section (421) is different color filter including optical reception module comprises a plurality of barbs. Specifically red band part of the visible optical communication reception module transmission device (410) receives the signal transmitted signals of red, green band visible optical communication reception module that receives a signal transmission device (410) receives the signal transmitted signals of green, part of the visible optical communication reception module blue band transmission device (410) receives a signals of the signal transmitted blue. The, color frequency division multiplexing based in visible optical communication, it is possible not to cross each other frequency band superimposed, orthogonality between subcarriers must not needed. I.e., (a) to (d) of Figure 5 as shown, transmission device (410) is red filter, green, even blue band transmits a signal, receiving device (420) color filtering through the red filter, green, separating and receive signals of equal to or higher than blue.

Figure 6 shows a method of the present invention also one in the embodiment according to frequency division multiplexing based visible optical flow are disclosed. Hereinafter, the frequency division multiplexing based visible optical communication device said method carried out at a exemplify by 2000.

The reference also 6, in step S610, the visible optical communication device transferring the data input converter in a form capable of day three. Specifically, visible optical communication device input data coding, interleaving, QAM mapping, pilot insertion, parallel or the like has a plurality of hierarchies.

In step S620, day three visible optical communication device based on the subcarrier modulating substrate. Specifically, each of the plurality of subcarrier each visible optical communication device comprises a plurality of day three mixing (mixing) including data modulated sub-carriers generate musical sound. In one in the embodiment, the orthogonality between subcarriers may have.

In step S630, the visible optical communication device transmit signal adjusting delays other. Specifically, the conversion signal IFFT is visible optical communication device transmits a signal to the same state, be transmitted each day three of adjusting delays other.

In one in the embodiment, visible optical communication device comprises a plurality of visible optical communication transmission module receives signals to be transmitted from each optical reception module through each of a plurality of barbs, delay of each signal and calculate information, transmit delay information calculated based on day three each transmission adjusting delays other.

In step S640, transmits the modulated sub-carriers is visible optical communication device. Specifically, visible optical communication device comprises a plurality of visible optical communication transmission module, transmits modulated sub-carriers each.

In one in the embodiment, different colors visible optical communication device transmits a signal at the frequency band is visible optical communication transmission module, can be modulated sub-carriers for transmitting.

Various computational means according to an embodiment of the present invention device and method can be carried out through program instructions can be embodied in the form of computer-readable medium recording. The computer readable media comprises program instructions, data files, data structure or the like can be either alone or in combination.

Computer-readable medium instructions are specially designed and constructed for the present invention are those recorded programs or computer software field to enable the one or more relative to conventional publicly known may be filled. Examples of computer-readable recording medium hard disk, floppy disk and magnetic medium (magnetic media) such as tapes, CD-a ROM, DVD (optical media) such as optical recording medium, such as magnetic - flop mote curl disk (floptical disk) optical medium (magneto-a optical media) and ROM (ROM), ram (RAM), such as flash memory and executing program instructions stored to hardware device specially configured multiple myelomas are included. In addition the aforementioned medium program instructions, data structure for transmitting a signal light or as an synthesiser comprising including metal, such as a waveguide of transmission media may be disclosed. Examples of such as machine code by a compiler program instructions are made can be carried out by a computer as well as interpreter order currently used in conventional language code comprises brilliance.

The above-mentioned hardware device of the present invention perform operations can be configured to operate as one or more software modules, and vice-versa are disclosed.

The present invention is to the tank by a number in the embodiment the transformed for flaws. The present invention is in the field of the present invention is provided essentially from deviating from a person with skill in the art of the present invention is embodied in the form of modified inputted properties may be understand it will rain. The definitive aspect as well as the descriptive disclosure in the embodiment are contemplated aspect should. The aforementioned range of the present invention description and claim rather than as shown, and the present invention is in a range equal to all differences may be carried on an will be interpreted.