基于MIMO-OFDM聯(lián)合技術(shù)LED可見(jiàn)光通信系統(tǒng)設(shè)計(jì)
發(fā)布時(shí)間：2018-11-16 17:18
【摘要】：可見(jiàn)光LED通信(VLC)技術(shù)由于其超寬的帶寬、輻射安全性及應(yīng)用廣泛性,已逐漸成為斷句通信的有利補(bǔ)充,并已形成為一種發(fā)展趨勢(shì)。期望不久的將來(lái),LED照明普及的同時(shí)VLC在室內(nèi)無(wú)線數(shù)據(jù)傳輸方面也能夠普及。VLC通信是通過(guò)驅(qū)動(dòng)電路將電信號(hào)通過(guò)高速閃爍的LED光源發(fā)射出去的。接收端捕捉這些光信號(hào),通過(guò)多種技術(shù)手段,從紛繁復(fù)雜的干擾中提取有用的信號(hào)分量,實(shí)現(xiàn)兼容照明與通信的雙重目的。 本文提出了將OFDM-MIMO聯(lián)合技術(shù)應(yīng)用在可見(jiàn)光通信系統(tǒng)的設(shè)計(jì)。OFDM技術(shù)通過(guò)IFFT及FFT算法將串行的高速碼流映射為并行的低速正交子載波,碼流速率降低,周期大幅延長(zhǎng)使得多徑時(shí)延帶來(lái)干擾非常小,又由于正交性使得接收端可以清楚的將每個(gè)載波信號(hào)剝離并還原。另外,OFDM技術(shù)對(duì)每個(gè)OFDM符號(hào)前段添加循環(huán)前綴。循環(huán)前綴長(zhǎng)度大于最大多徑時(shí)延,成功的克制了多徑效應(yīng)。 MIMO技術(shù)采用了多天線收發(fā)的技術(shù),利用空分復(fù)用的原理,同時(shí)收發(fā)多路光信號(hào)。本文設(shè)計(jì)了2發(fā)2收天線陣列,與傳統(tǒng)的單發(fā)單收天線技術(shù)相比,信道的利用率提高一倍,信道容量也變?yōu)樵瓉?lái)的2倍。采用的MIMO的檢測(cè)為MMSE算法。同時(shí),MIMO技術(shù)同時(shí)也利用了空間分集原理。在發(fā)射端對(duì)信源進(jìn)行STBC編碼,天線間發(fā)射的數(shù)據(jù)流彼此正交,減少多天線帶來(lái)的自干擾,帶來(lái)了編碼增益。 本設(shè)計(jì)針對(duì)傳統(tǒng)的光通信模式、僅有OFDM調(diào)制的光通信模式、OFDM-MIMO聯(lián)合技術(shù)的光通信模式、帶有STBC編碼的OFDM-MIMO聯(lián)合技術(shù)的光通信模式,這四種模式經(jīng)行仿真。仿真誤碼率曲線表明這四種模式下誤碼率的表現(xiàn)是依次遞優(yōu)的。
[Abstract]:Because of its wide bandwidth, radiation safety and wide application, (VLC) technology of visible light LED communication has gradually become a favorable supplement to break sentence communication, and has become a trend of development. It is expected that in the near future, LED lighting will be popularized, while VLC will be able to popularize indoor wireless data transmission. VLC communication emits electrical signals through high speed flicker LED light source through driving circuit. The receiver captures these optical signals and extracts the useful signal components from the complex interference by a variety of technical means to achieve the dual purpose of compatible lighting and communication. In this paper, the design of the application of OFDM-MIMO technology in visible light communication system is presented. The OFDM technology maps the serial high speed bitstream into a parallel low speed orthogonal subcarrier by IFFT and FFT algorithm, which reduces the bitstream rate. The extended period makes the interference of multipath delay very small, and because of the orthogonality, the receiver can clearly peel off and restore each carrier signal. In addition, OFDM technology adds a cyclic prefix to the front of each OFDM symbol. The cyclic prefix length is larger than the maximum multipath delay and the multipath effect is successfully restrained. The MIMO technology adopts the technology of multi-antenna transceiver and uses the principle of space-division multiplexing to transmit and receive multi-channel optical signals at the same time. In this paper, two transmit and two receive antenna arrays are designed. Compared with the traditional single transmit and single receiving antenna technology, the channel utilization ratio is doubled and the channel capacity is doubled. The detection of MIMO is MMSE algorithm. At the same time, MIMO technology also makes use of spatial diversity principle. The source is coded by STBC at the transmitter, and the data streams transmitted between the antennas are orthogonal to each other, which reduces the self-interference caused by the multiple antennas and brings the coding gain. This design aims at the traditional optical communication mode, only the optical communication mode of OFDM modulation, the optical communication mode of OFDM-MIMO joint technology, the optical communication mode with STBC coded OFDM-MIMO joint technology, and the simulation of these four modes. The simulation results show that the performance of BER in these four modes is sequentially superior.
【學(xué)位授予單位】：華東理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TN929.1
本文編號(hào)：2336132
[Abstract]:Because of its wide bandwidth, radiation safety and wide application, (VLC) technology of visible light LED communication has gradually become a favorable supplement to break sentence communication, and has become a trend of development. It is expected that in the near future, LED lighting will be popularized, while VLC will be able to popularize indoor wireless data transmission. VLC communication emits electrical signals through high speed flicker LED light source through driving circuit. The receiver captures these optical signals and extracts the useful signal components from the complex interference by a variety of technical means to achieve the dual purpose of compatible lighting and communication. In this paper, the design of the application of OFDM-MIMO technology in visible light communication system is presented. The OFDM technology maps the serial high speed bitstream into a parallel low speed orthogonal subcarrier by IFFT and FFT algorithm, which reduces the bitstream rate. The extended period makes the interference of multipath delay very small, and because of the orthogonality, the receiver can clearly peel off and restore each carrier signal. In addition, OFDM technology adds a cyclic prefix to the front of each OFDM symbol. The cyclic prefix length is larger than the maximum multipath delay and the multipath effect is successfully restrained. The MIMO technology adopts the technology of multi-antenna transceiver and uses the principle of space-division multiplexing to transmit and receive multi-channel optical signals at the same time. In this paper, two transmit and two receive antenna arrays are designed. Compared with the traditional single transmit and single receiving antenna technology, the channel utilization ratio is doubled and the channel capacity is doubled. The detection of MIMO is MMSE algorithm. At the same time, MIMO technology also makes use of spatial diversity principle. The source is coded by STBC at the transmitter, and the data streams transmitted between the antennas are orthogonal to each other, which reduces the self-interference caused by the multiple antennas and brings the coding gain. This design aims at the traditional optical communication mode, only the optical communication mode of OFDM modulation, the optical communication mode of OFDM-MIMO joint technology, the optical communication mode with STBC coded OFDM-MIMO joint technology, and the simulation of these four modes. The simulation results show that the performance of BER in these four modes is sequentially superior.
【學(xué)位授予單位】：華東理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TN929.1
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