本文關(guān)鍵詞： 高速移動(dòng)列車 均衡 編碼調(diào)制系統(tǒng) Turbo碼 低密度奇偶校驗(yàn)碼　出處：《西安電子科技大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：信道編碼是提高信息傳輸?shù)目煽考夹g(shù),在通信系統(tǒng)中充當(dāng)著重要的角色。在高鐵日益普及的今天,對(duì)高移動(dòng)環(huán)境下的高可靠性、高譜效率通信技術(shù)的研究將有助于給高速移動(dòng)列車上的乘客提供更好的通信服務(wù)質(zhì)量。本文根據(jù)適用于高速移動(dòng)列車通信的信道模型,主要研究高移動(dòng)性環(huán)境下編碼調(diào)制系統(tǒng)的性能。在高斯信道下,Turbo碼、二元/多元LDPC碼的都具有十分有益的性能,采用OFDM技術(shù)可以有效抵抗多徑衰落對(duì)通信系統(tǒng)所帶來(lái)的影響,因此,對(duì)于高移動(dòng)環(huán)境下的通信系統(tǒng),找到基于OFDM傳輸下在快速變化信道中性能良好的信道編碼技術(shù)顯得至關(guān)重要。本文對(duì)一種非平穩(wěn)基于幾何隨機(jī)模型的高移動(dòng)信道的各統(tǒng)計(jì)特性進(jìn)行了仿真與分析。接著,研究了OFDM系統(tǒng)中適用于快速變化信道的信道估計(jì)技術(shù)與信道均衡技術(shù),對(duì)它們的特點(diǎn)、計(jì)算復(fù)雜度等進(jìn)行了詳細(xì)的介紹與對(duì)比。在此基礎(chǔ)上,本文給出了高移動(dòng)性環(huán)境下,基于OFDM技術(shù)的編碼調(diào)制系統(tǒng)的結(jié)構(gòu)框圖與仿真流程圖,重點(diǎn)對(duì)Turbo碼、二元LDPC碼和多元LDPC碼分別結(jié)合QPSK、16QAM和64QAM所組成的編碼調(diào)制系統(tǒng)在快變信道下的性能進(jìn)行了仿真分析。實(shí)際結(jié)果表明,對(duì)于360km/h及以上的列車移動(dòng)速度,限于均衡能力有限,64QAM的高階數(shù)調(diào)制已經(jīng)不再適用;在各種編碼方式中,相比于Turbo碼與二元LDPC碼,多元LDPC碼在列車高速運(yùn)行的信道狀況下的性能具有明顯的優(yōu)勢(shì),是5G高移動(dòng)通信系統(tǒng)強(qiáng)有力的一種備選編碼方案。
[Abstract]:Channel coding is a reliable technology to improve the transmission of information, which plays an important role in the communication system. The research of high spectral efficiency communication technology will help to provide better communication quality of service for passengers on high-speed mobile train. This paper is based on the channel model suitable for high-speed mobile train communication. This paper mainly studies the performance of coded modulation system in high mobility environment. In Gao Si channel, the binary / multivariate LDPC codes have very beneficial performance. OFDM technology can effectively resist the impact of multipath fading on the communication system, therefore, for the communication system in high mobile environment. It is very important to find a channel coding technique with good performance in fast changing channel based on OFDM transmission. In this paper, the statistical characteristics of a non-stationary high mobile channel based on geometric random model are simulated. And analysis. Then. The channel estimation technology and channel equalization technique suitable for fast changing channel in OFDM system are studied. Their characteristics, computational complexity and so on are introduced and compared in detail. In this paper, the structure block diagram and simulation flow chart of the coded modulation system based on OFDM technology are given under the environment of high mobility. The emphasis is on the Turbo code. The performance of the coded modulation system composed of binary LDPC code and multivariate LDPC code combined with QPSKN 16QAM and 64QAM is simulated and analyzed in fast variable channel. For 360 km / h and above, the high order modulation with limited equalization capacity is no longer applicable. Compared with Turbo codes and binary LDPC codes, the performance of multivariate LDPC codes in high-speed train running channel has obvious advantages. It is a powerful alternative coding scheme for 5 G high mobile communication system.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN911.22

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本文編號(hào)：1484950