【摘要】：隨著通信技術(shù)的不斷發(fā)展,人們對(duì)信息交換、互聯(lián)網(wǎng)絡(luò)、無(wú)線通信以及移動(dòng)通信技術(shù)的要求越來(lái)越高。無(wú)線光通信以其抗電磁干擾能力強(qiáng)、保密性好、頻段無(wú)需申請(qǐng)、機(jī)型方便架設(shè)以及容量大等優(yōu)點(diǎn),成為解決新一代通信技術(shù)長(zhǎng)期演進(jìn)過(guò)程中一種可行的替代技術(shù)和有前途的補(bǔ)充技術(shù)。本文針對(duì)M湍流無(wú)線光通信系統(tǒng),建立更加符合實(shí)際的信道模型并提出提高系統(tǒng)傳輸性能的設(shè)計(jì)方案,主要的研究工作包括:(1)在對(duì)大氣傳播特性的分析之后,針對(duì)引起信號(hào)衰減的原因:大氣的衰減作用、M湍流作用以及非零指向誤差,提出M湍流無(wú)線光通信系統(tǒng)的信道模型,此模型可以表征不同程度湍流情況下的無(wú)線光通信系統(tǒng),在此基礎(chǔ)之上推導(dǎo)出M湍流無(wú)線光通信系統(tǒng)衰減因子的概率密度函數(shù)表達(dá)式,更加全面地考慮影響無(wú)線光通信系統(tǒng)傳輸性能的因素。(2)根據(jù)提出的M湍流無(wú)線光通信系統(tǒng)信道衰減因子的概率密度函數(shù)表達(dá)式,以及容量分析的基礎(chǔ)知識(shí),本文對(duì)無(wú)線光通信系統(tǒng)各態(tài)歷經(jīng)容量的上界、下界和中斷概率的性能進(jìn)行分析。研究表明,傳輸距離、發(fā)送信噪比以及大氣的衰減情況對(duì)M湍流無(wú)線光通信系統(tǒng)的性能的影響不容忽視。本文提出的M湍流無(wú)線光通信系統(tǒng)各態(tài)歷經(jīng)容量的上界和下界之間的差距非常小,并且遠(yuǎn)小于香農(nóng)公式推導(dǎo)的各態(tài)歷經(jīng)容量,更加符合實(shí)際的傳輸情況。經(jīng)過(guò)仿真發(fā)現(xiàn),減小光接收機(jī)的接收半徑以及控制瞄準(zhǔn)線位移偏差,可以降低系統(tǒng)的中斷概率。(3)利用多載波調(diào)制系統(tǒng)的速率高以及抗頻率選擇性干擾強(qiáng)等特點(diǎn),將正交頻分復(fù)用的調(diào)制技術(shù)運(yùn)用到M湍流無(wú)線光通信系統(tǒng)中,分析影響直流偏置光正交頻分復(fù)用無(wú)線光通信(DCO-OFDM)系統(tǒng)平均誤碼率的因素。因?yàn)闊o(wú)線光通信系統(tǒng)的傳輸信號(hào)是非負(fù)的實(shí)信號(hào),DCO-OFDM系統(tǒng)在發(fā)送端加上直流偏置電壓,所引起的非線性失真等效為固定的增益與非相干噪聲之和。仿真結(jié)果表明,系統(tǒng)的平均誤碼率與發(fā)送功率和大氣湍流情況有關(guān)。一定程度地提高系統(tǒng)的直流偏置電壓值,可以降低M湍流無(wú)線光DCO-OFDM系統(tǒng)的平均誤碼率,提高系統(tǒng)傳輸性能。
[Abstract]:With the development of communication technology, the requirements of information exchange, Internet, wireless communication and mobile communication are becoming higher and higher. Wireless optical communication has the advantages of strong ability of resisting electromagnetic interference, good confidentiality, no need to apply for frequency band, convenient erection of type and large capacity, etc. It has become a feasible alternative technology and a promising supplementary technology to solve the long-term evolution of new generation communication technology. In this paper, a more practical channel model for M turbulent wireless optical communication system is established and a design scheme to improve the transmission performance of the system is proposed. The main research work includes: (1) after analyzing the characteristics of atmospheric propagation, Aiming at the causes of signal attenuation, such as atmospheric attenuation, M turbulence and non-zero pointing error, the channel model of M turbulence wireless optical communication system is proposed, which can represent the wireless optical communication system with different degree of turbulence. On this basis, the probability density function expression of attenuation factor for M turbulence wireless optical communication system is derived. The factors that affect the transmission performance of wireless optical communication system are considered more comprehensively. (2) according to the probability density function expression of channel attenuation factor of M turbulent wireless optical communication system, and the basic knowledge of capacity analysis, The performance of ergodic capacity upper bound, lower bound and interrupt probability of wireless optical communication system is analyzed in this paper. The results show that the influence of transmission distance, transmit signal-to-noise ratio and atmospheric attenuation on the performance of M turbulent wireless optical communication system can not be ignored. The difference between the ergodic capacity of each state and the lower bound of M turbulent wireless optical communication system proposed in this paper is very small, and is much smaller than the ergodic capacity of each state derived from Shannon's formula, which is more in line with the actual transmission situation. The simulation results show that the interruption probability of the system can be reduced by reducing the receiving radius of the optical receiver and controlling the offset of the line of sight. (3) the characteristics of the multicarrier modulation system such as high rate and strong anti-frequency selective interference are utilized. The modulation technology of orthogonal frequency division multiplexing (OFDM) is applied to M turbulent wireless optical communication system. The factors affecting the average bit error rate (BER) of DC biased optical orthogonal frequency division multiplexing (DCO-OFDM) system are analyzed. Because the transmitted signal of the wireless optical communication system is non-negative real signal, the nonlinear distortion caused by the DC bias voltage in the DCO-OFDM system is equivalent to the sum of the fixed gain and the incoherent noise. The simulation results show that the average bit error rate (BER) of the system is related to the transmission power and atmospheric turbulence. To a certain extent, increasing the DC bias voltage of the system can reduce the average bit error rate of M-turbulence wireless optical DCO-OFDM system and improve the transmission performance of the system.
【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN929.1

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