【摘要】：衛(wèi)星通信作為地面通信的補(bǔ)充和延伸,因其具有覆蓋范圍廣泛、不受地理環(huán)境限制、對(duì)抗自然災(zāi)害能力優(yōu)異等優(yōu)勢(shì),具有不可替代的地位。然而,衛(wèi)星通信由于信道條件開放,會(huì)受到各種大氣因素的影響,尤其是降雨造成的雨衰會(huì)對(duì)Ka波段的高頻信號(hào)造成嚴(yán)重的干擾。自適應(yīng)編碼調(diào)制技術(shù)作為衰落補(bǔ)償技術(shù)的一種,可以根據(jù)信道狀況調(diào)整編碼和調(diào)制方式,能夠解決衰落對(duì)衛(wèi)星通信的影響問題。因此,衛(wèi)星通信中的自適應(yīng)編碼調(diào)制技術(shù)成為衛(wèi)星通信領(lǐng)域的研究熱點(diǎn)之一。 論文研究了衛(wèi)星通信中的自適應(yīng)編碼調(diào)制技術(shù),分析了雨衰隨時(shí)間變化對(duì)信道的影響和衛(wèi)星通信中的信噪比估計(jì)技術(shù),主要研究工作如下： 1.研究了衛(wèi)星通信系統(tǒng)組成及其物理層技術(shù),對(duì)包括衛(wèi)星信道模型、信噪比估計(jì)技術(shù)和自適應(yīng)編碼調(diào)制技術(shù)進(jìn)行了深入調(diào)研。 2.分析了天氣狀況對(duì)Ka波段高軌固定衛(wèi)星信道的影響,建立了包絡(luò)和相位服從高斯分布的Ka波段高軌固定衛(wèi)星信道靜態(tài)模型,并對(duì)不同天氣狀況對(duì)信道的影響進(jìn)行了仿真分析。在研究衰落斜率的基礎(chǔ)上,設(shè)計(jì)了適合于Ka波段高軌衛(wèi)星信道的基于馬爾科夫狀態(tài)的短期雨衰時(shí)間序列動(dòng)態(tài)模型,并進(jìn)行仿真研究,研究結(jié)果表明該模型能夠較好地反映雨衰對(duì)Ka波段衛(wèi)星信道的影響。 3.研究了適用于衛(wèi)星通信系統(tǒng)的信噪比估計(jì)算法,仿真對(duì)比了EVM算法、SSME算法、M2M4算法、SVR算法、MMSE算法和ML算法在相同條件下的性能。 4.研究了自適應(yīng)編碼調(diào)制技術(shù)的原理和關(guān)鍵技術(shù),DVB-S2標(biāo)準(zhǔn)中的編碼、調(diào)制等內(nèi)容,建立了基于DVB-S2標(biāo)準(zhǔn)的仿真平臺(tái),對(duì)不同編碼調(diào)制方式進(jìn)行仿真�；谒O(shè)計(jì)的短時(shí)間降雨雨衰時(shí)間序列模型,提出了DVB-S2標(biāo)準(zhǔn)自適應(yīng)編碼調(diào)制的優(yōu)化方案,并進(jìn)行了仿真研究。研究結(jié)果表明,優(yōu)化方案能夠有效降低DVB-S2標(biāo)準(zhǔn)原方案的復(fù)雜度。基于馬爾科夫狀態(tài)理論,設(shè)計(jì)了一種新型的自適應(yīng)編碼調(diào)制方式選擇算法,并進(jìn)行了仿真研究。仿真結(jié)果表明,該算法的性能優(yōu)于傳統(tǒng)的門限法。
[Abstract]:Satellite communication, as a supplement and extension of terrestrial communication, has an irreplaceable position because of its advantages such as wide coverage, not limited by geographical environment, excellent ability to resist natural disasters and so on. However, because of the open channel conditions, satellite communications will be affected by various atmospheric factors, especially the rain decline caused by rainfall will cause serious interference to the high frequency signal in Ka band. As one of the fading compensation techniques, adaptive coding modulation can adjust the coding and modulation methods according to the channel conditions, and can solve the problem of the influence of fading on satellite communication. Therefore, adaptive coding modulation technology in satellite communication has become one of the research hotspots in satellite communication field. In this paper, the adaptive coding modulation technology in satellite communication is studied, and the influence of rain attenuation with time on channel and SNR estimation in satellite communication are analyzed. The main research work is as follows: 1. The composition of satellite communication system and its physical layer technology are studied, including satellite channel model, SNR estimation technology and adaptive coding modulation technology. 2. This paper analyzes the influence of weather condition on the Ka band high orbit fixed satellite channel, establishes the static model of the Ka band high orbit fixed satellite channel with the distribution of envelope and phase suit from Gao Si, and simulates the influence of different weather conditions on the channel. Based on the study of fading slope, a dynamic model of short term rain decline time series based on Markov state for Ka band high orbit satellite channel is designed and simulated. The results show that the model can well reflect the influence of rain failure on the Ka band satellite channel. 3. The SNR estimation algorithm for satellite communication system is studied. The performance of EVM algorithm, SSME algorithm, M2M4 algorithm, SVR algorithm, MMSE algorithm and ML algorithm under the same conditions are simulated and compared. 4. The principle and key technology of adaptive coding modulation, the coding and modulation of DVB-S2 standard are studied. The simulation platform based on DVB-S2 standard is established to simulate the different coding modulation methods. Based on the designed model of short time rainfall and rain decline time series, an optimized scheme of DVB-S2 standard adaptive coding modulation is proposed, and the simulation research is carried out. The results show that the optimized scheme can effectively reduce the complexity of the original DVB-S2 standard scheme. Based on Markov state theory, a novel adaptive coding modulation selection algorithm is designed and simulated. Simulation results show that the performance of the algorithm is better than the traditional threshold method.
【學(xué)位授予單位】：北京郵電大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN927.2

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