KR20160133838A - VLC Transmitter and Receiver with PCI Interface - Google Patents

Abstract

The present invention relates to a VLC (Visible Light Communication) transmitter / receiver PHY structure according to the IEEE 802.15.7 standard. For simultaneous functions as a lighting device and a communication device, a transmitter supports a dimming function, Transmission and reception, and features a VLC transmitter and receiver structure supporting simultaneous high-speed and low-speed through the sharing of internal calculation blocks. Therefore, it supports wireless LAN (WPAN) function by supporting functions as a lighting device and communication between computers and peripherals, mobile phones, household appliances, etc. by wirelessly connecting these devices to be used in short distance wireless optical communication convergent lighting .

Description

(VLC Transmitter and Receiver with PCI Interface)

The present invention relates to a VLC (Visible Light Communication) transmitter / receiver PHY structure conforming to the IEEE 802.15.7 standard, more specifically, to a function of a dimming function by supporting a dimming function, And a transmission and reception PHY structure for supporting high-speed communication of 96Mbps high-capacity data through DMA of a PCI interface.

Visible light communication technology is a technology to communicate wirelessly using optical transmitter and receiver. It is a technology that can communicate with functions as lighting while using LED lighting infrastructure as it is. In the visible light communication, the lifetime of the LED used as the light source is semi-permanent, and since the light is used as the communication medium, the electromagnetic wave is not emitted and harmless to the human body. In addition, it can be used in hospitals, airplanes, etc., where electromagnetic waves can cause serious malfunctions, and RF-based wireless communications must be licensed for use due to the scarcity due to limited frequency resources. There is no interference with industrial scientific and medical radio bands (ISM) bands already used for other purposes.

Recently, as the high-performance portable terminals such as smart phones have been spreading, the use of large-capacity multimedia files has increased in recent short-range wireless communication, and accordingly, a large-capacity file is frequently required to be transferred between portable devices or between portable and fixed devices. Visible light communication can be applied as a means to support high-speed short distance communication because it can provide energy efficiency enhancement and security function according to high-speed optical transmission technology and visibility of communication area.

In IEEE Standard 802.15.7: Short-Range Wireless Optical Communication Using Visible Light, which is an international standard for visible light wireless communication technology, a technical standard for physical layer and MAC layer for providing various services , And research is being actively carried out to prevail the VLC-LED lighting market around the world.

The present invention aims at securing the leading technology of the VLC-LED lighting market in the future by designing an efficient PHY structure of a VLC transmitter and receiver that supports low-speed and high-speed communication using a PCI interface in accordance with international standards.

Other objects and advantages of the present invention will become apparent from the following description, and it will be understood by those skilled in the art that the present invention is not limited thereto. It will also be readily apparent that the objects and advantages of the invention may be realized and attained by means of the instrumentalities and combinations particularly pointed out in the appended claims.

The present invention for achieving the above object is composed of a transmitter 5 composed of a transmitter PCI Core 1 and a VLC transmission PHY 2 and a receiver 6 composed of a receiver PCI Core 3 and a VLC reception PHY 4 do.

Transmitter The PCI Core (1) transmits the transmission data for 6 Mbps low-speed communication and the transmission data for high-speed communication of 96 Mbps through the DMA interface and transmits a control signal for controlling the VLC transmission PHY through the register map.

The VLC transmitting PHY 2 is a transmitting PHY that can receive the control signal and transmit the data at the transmission rates of 6 Mbps, 19.2 Mbps, and 96 Mbps defined by IEEE 802.15.7. At the same time, the VLC transmitting PHY 2 performs the dimming control do.

The VLC receiving PHY 3 detects and decodes the communication frame in the visible light signal received from the PD (Photo Dectector), and then transmits the received data.

The receiver PCI Core 4 transfers the received data through the DMA interface, and transmits a control signal for controlling the VLC receiving PHY to the receiving PHY through the Register Map.

As described above, according to the present invention, by designing an effective structure of a VLC transmitter / receiver PHY capable of simultaneously applying a function of brightness capable of adjusting brightness and a low-speed and high-speed communication function according to an international standard, .

1 shows an embodiment of a VLC transmitter and receiver using a PCI interface
2 is a block diagram of an embodiment of a VLC transmitter PHY structure
FIG. 3 is a flow chart of one embodiment of the Dimming control of the VLC transmitter
4 is a block diagram of an embodiment of a VLC receiver PHY structure
5 is a flowchart of an embodiment of a VLC receiver PHY structure

The foregoing and other objects, features and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings, in which: There will be. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 shows an embodiment of a VLC transmitter and receiver using a PCI interface.

As shown in FIG. 1, the transmitter PCI Core 1 transmits the control data through the DMA interface and the control map through the register map to the VLC transmitting PHY. The VLC transmitting PHY 2 receives the control signal and performs OOK Modulation And simultaneously transmits the control signal to the LED driving circuit so that the brightness can be adjusted by using the dimming pattern.

The VLC receiving PHY 3 decodes the data after acquiring the use synchronization of the CDR in the visible light signal received from the PD (Photo Dectector), and delivers the decoded data to the receiver PCI Core 4. The receiver PCI Core 4 receives the received data Through the DMA interface, and transmits a control signal for controlling the VLC receiving PHY to the receiving PHY through the Register Map.

2 is a block diagram of an embodiment of a VLC transmitter PHY structure.

The VLC transmitter PHY includes a PCI Core, a Format Generator 20, an RS Encoder 21, an RLL Encoder 22, and an OOK Modulator 23.

A PHY (Physical Layer Header) and a PHY Service Data Unit (PSDU) in the Format Generator 20 in accordance with the data transmitted through the DMA Interface 10 of the PCI Core 1 and the control signal transmitted through the Register Interface 11, ) Frame format. The RS encoder 21 performs encoding according to the RS (64, 32) and RS (160, 128) according to the transmission mode and can simplify the calculation through sharing of the operation block. The RLL encoder 22 performs 8B10B encoding.

The On-Off Keying (OOK) modulator 23 performs a function of inserting and transmitting a preamble to a frame and a function of dimming control for adjusting the brightness.

3 is a flowchart of one embodiment of Dimming control of a VLC transmitter.

As shown in FIG. 3, after transmitting the preamble, the PHY Header is transmitted, and then the data is transmitted. Dimming control uses the Compensation Symbol to adjust the brightness.

4 is a block diagram of an embodiment of a VLC receiver PHY structure.

The VLC receiver PHY includes a CDR 30, a Frame Detector 31, an RLL Decoder 32, a PHR Decoding 33, an RS Decoder 34, and a PCI Core 4. The CDR (Clock Data Recover) 30 uses clocks of four phases of 0 degree, 90 degree, 180 degree and 270 degree, so that it is not sensitive to timing by jitter without using high-speed clock for over-sampling It has the advantage that it can be designed as a structure. The Frame Detector 31 detects a frame transmitted from the transmitter 2 through detection of a TDP (Topology Dependent Pattern) through correlation. The RLL Decoder 32 converts the serial input data in parallel according to the OOK modulation scheme into a parallel of Bytes, and then performs 8B10B decoding. The detected data frame extracts frame information transmitted through PHR Decoding (33), and performs PSDU decoding based on the extracted information. The RS Decoder shares the received PHR and PSDU for decoding, and it reduces the unnecessary operations by sharing the operation blocks of RS (64,32) and RS (160,128) according to the mode. The received data is transferred via the receive DMA interface 40. [

5 is a flowchart of an embodiment of a VLC receiver PHY structure. When the bit synchronization is locked in the CDR 30, the Frame Detector 31 finds the start point of the frame. After the RLL Decoding, the PSDU data is decoded based on the frame information analyzed in the PHR Decoding 33.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. The present invention is not limited to the drawings.

1: Transmitter PCI Core 2: VLC transmit PHY
3: VLC receive PHY 4: Receiver PCI Core
5: Transmitter 6: Receiver
10: Transmitter DMA Interface 11: Transmitter Register Interface
20: Format Generator 21: RS Encoder
22: RLL Encoder 23: OOK Modulator
30: CDR 31: Frame Detector
32: RLL Decoder 33: PHR Decoding
34: RS Decoder 40: Receiver DMA Interface
41: Receiver Register Interface

Claims (3)

VLC PHY that controls PCI interface support and dimming in VLC (Visible Light Communication)
A transmitter 5;
VLC PHY receiver supporting CDR and PCI Interface (6)
The method according to claim 1,
The VLC PHY transmitter 5 supports a PCI interface for transmitting large amounts of data in a VLC (Visible Light Communication) system, and is capable of simultaneously performing dimming control and communication.
The method according to claim 1,
The VLC PHY receiver is a PHY receiver featuring an RS decoder that erases the PCI interface for receiving large amounts of data in a VLC (Visible Light Communication) system, and shares 4Phase CDR (Clock Data Recovery)

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