本文選題：航空無(wú)線寬帶通信　切入點(diǎn)：高空平臺(tái)通信系統(tǒng)　出處：《中國(guó)民航大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：要真正地實(shí)現(xiàn)航空無(wú)線寬帶通信服務(wù),需滿足航空高空環(huán)境下自由的無(wú)線寬帶信號(hào)接入。地面寬帶無(wú)線信號(hào)接入技術(shù)都是基于120km/h以下低速環(huán)境。而航空無(wú)線寬帶通信處于高速移動(dòng)的環(huán)境,因此會(huì)產(chǎn)生新的信號(hào)接入問(wèn)題。航空寬帶信號(hào)接入需要考慮隔離度問(wèn)題、損耗問(wèn)題、子載波間的干擾問(wèn)題以及多普勒(Doppler)頻偏等問(wèn)題。首先,本文對(duì)航空無(wú)線寬帶信號(hào)接入網(wǎng)絡(luò),分別設(shè)計(jì)出了基于基站、移動(dòng)衛(wèi)星以及高空通信平臺(tái)系統(tǒng)(The High Altitude Platform Stations,HAPS)的航空無(wú)線寬帶信號(hào)接入網(wǎng)模型。其次,對(duì)于航空無(wú)線寬帶信號(hào)接入的隔離問(wèn)題,本文提出了采用改進(jìn)的混合算法計(jì)算天饋系統(tǒng)隔離度,該方法相對(duì)于原算法提高了計(jì)算效率。針對(duì)航空客艙內(nèi)無(wú)線寬帶信號(hào)接入損耗嚴(yán)重的問(wèn)題,提出了設(shè)計(jì)飛機(jī)—地面回傳系統(tǒng)的思想,通過(guò)這個(gè)系統(tǒng),能夠較好地解決信號(hào)接入的損耗。最后,針對(duì)信號(hào)接入的子載波干擾(ICI,inter channel interference)問(wèn)題,提出采用移動(dòng)加權(quán)算法優(yōu)化的ICI抑制算法,能夠更大程度抑制信號(hào)接入ICI。針對(duì)信號(hào)接入Doppler頻偏問(wèn)題,提出采用優(yōu)化的頻偏預(yù)處理算法后,能夠更加準(zhǔn)確地判決Doppler頻偏。另外提出了借助Rake技術(shù)對(duì)Doppler頻偏進(jìn)行處理。仿真結(jié)果表明,上述方法能夠較好地解決高速環(huán)境下信號(hào)接入的Doppler頻偏問(wèn)題。
[Abstract]:To truly achieve aviation wireless broadband communication services, The ground broadband wireless signal access technology is based on the low speed environment below 120 km / h, and the aviation wireless broadband communication is in the high-speed mobile environment. Therefore, there will be a new problem of signal access. The problem of isolation, loss, inter-carrier interference and Doppler Doppler frequency offset should be considered in aeronautical broadband signal access. The model of aeronautical wireless broadband signal access network based on base station, mobile satellite and the High Altitude Platform stations is designed. Secondly, the isolation problem of aeronautical wireless broadband signal access is discussed. In this paper, an improved hybrid algorithm is proposed to calculate the isolation degree of the space-fed system. Compared with the original algorithm, this method improves the computational efficiency. The idea of designing aircraft-ground backhaul system is presented. By this system, the loss of signal access can be solved well. Finally, aiming at the subcarrier interference of signal access, the problem of ICII inter channel interference is discussed. An optimized ICI suppression algorithm based on mobile weighted algorithm is proposed, which can suppress the signal access to Doppler to a greater extent. In view of the problem of signal access to Doppler frequency offset, an optimized frequency offset preprocessing algorithm is proposed. The Doppler frequency offset can be judged more accurately. In addition, the Doppler frequency offset is processed by using Rake technology. The simulation results show that the above method can solve the Doppler frequency offset problem of signal access in high speed environment.
【學(xué)位授予單位】：中國(guó)民航大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN929.5

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