發(fā)布時間：2018-04-17 13:42

  本文選題：LTE + 網(wǎng)絡(luò)規(guī)劃與優(yōu)化��； 參考：《東華大學(xué)》2014年碩士論文

【摘要】：現(xiàn)代通信技術(shù)隨著科技的進步飛速發(fā)展,中國的無線網(wǎng)絡(luò)已成功由3G邁入4G,進入LTE時代。傳播模型是蜂窩無線網(wǎng)絡(luò)規(guī)劃的基礎(chǔ),傳播模型的準(zhǔn)確性直接影響到無線網(wǎng)絡(luò)規(guī)劃和優(yōu)化的合理性,最終影響通信質(zhì)量,所以對傳播模型及模型校正算法的研究顯得極其重要。 傳播模型是對無線電波傳播過程中的路徑損耗進行預(yù)測,不同的傳播模型有不同的路徑損耗公式,經(jīng)典傳播模型雖具有相當(dāng)大的普遍適用性,但是對于具體環(huán)境需具體分析。本文對經(jīng)典傳播模型原理進行闡述并總結(jié)對比其傳播特性,對Okumura-Hata模型、COST-231Hata模型、SPM模型進行了仿真分析,結(jié)果表明在密集城區(qū)的傳播環(huán)境下SPM模型是最適合LTE系統(tǒng)的傳播模型。 隨著城市的迅速發(fā)展,密集城區(qū)的地貌環(huán)境趨向多元化和復(fù)雜化,導(dǎo)致傳播模型校正的準(zhǔn)確性降低,難度增加。為了提高密集城區(qū)模型校準(zhǔn)的準(zhǔn)確性,得到與本地傳播環(huán)境相匹配的傳播模型,本文采用擬合校正法、一元校正法以及改進的傳播模型校正法分別進行實測數(shù)據(jù)的傳播模型校正。改進的傳播模型校正方法基于WLS算法,消除了采樣點信號的異方差性,提高了采樣數(shù)據(jù)的有效性,另外考慮了地貌損耗的變化加入了計算獲得的變化的clutter (i)值,使得傳播模型能夠反映當(dāng)?shù)貍鞑キh(huán)境的地貌變化,匹配度得到提升。根據(jù)改進的模型校正算法,本文在matlab/GUI平臺上進行模型校正軟件的開發(fā),該軟件能夠?qū)崿F(xiàn)CW數(shù)據(jù)的導(dǎo)入、模型校正公式系數(shù)的輸出以及誤差分析功能。通過校正后的傳播模型路損公式,本文進行鏈路預(yù)算分析,根據(jù)收發(fā)端的參數(shù)信息得到上下行的鏈路預(yù)算表,為后期覆蓋分析奠定基礎(chǔ)。論文采用的實測數(shù)據(jù)是在上海某密集城區(qū)采集到的CW數(shù)據(jù),數(shù)據(jù)包含了采樣點的有效GIS信息以及電平信息等,數(shù)據(jù)處理過程是在matlab平臺實現(xiàn)的,其中使用到的2維GIS軟件也是在matlab/GUI平臺上開發(fā)的。 本文對LTE系統(tǒng)的實測CW數(shù)據(jù)分別進行模型校正,校正結(jié)果表明,在地貌環(huán)境復(fù)雜的密集城區(qū)進行大尺度傳播模型校正時,改進算法使得預(yù)測數(shù)據(jù)的誤差最低,校正后的傳播模型準(zhǔn)確性大幅提高,結(jié)果表明改進算法更能夠有效反映當(dāng)?shù)氐膫鞑キh(huán)境。
[Abstract]:With the rapid development of modern communication technology, the progress of science and technology, the wireless network Chinese successfully by 3G into 4G, into the LTE era. Propagation model is based on wireless network planning cellular propagation model's accuracy directly affects the rationality of wireless network planning and optimization, and ultimately affect the quality of communication, so the propagation model and model calibration algorithm the research is extremely important.
The propagation model is to predict the path loss of radio wave propagation in the process, there are different propagation path loss formula of different models, the classical propagation model has considerable general applicability, but need a detailed analysis for the specific environment. This paper describes the principle of the classical propagation model and summarizes the comparison of the propagation characteristics of the Okumura-Hata model, COST-231Hata model, SPM model is simulated. The results show that in the dense urban propagation environment SPM model is the most suitable model for the propagation of the LTE system.
With the rapid development of the city, the dense urban geomorphic environment become more diversified and complicated, resulting in lower accuracy of propagation model calibration more difficult. In order to improve the accuracy of the calibration model of dense urban area, spread model matched with the local propagation environment, this paper uses the fitting correction method, propagation model correction method and the improved one yuan correction method of propagation model were measured data correction. Improved propagation model calibration method based on WLS algorithm, eliminates the heteroscedasticity of the sampling signal, improves the effectiveness of the sampling data, in addition to considering the landform change loss joined the calculated changes of clutter (I) value, so that the propagation model can reflect the the topographical changes the local propagation environment, improve the matching degree obtained. According to the improved calibration algorithm model based on the matlab/GUI platform for model calibration software Development, this software can realize the CW data input, the output coefficient of model correction formula and error analysis. The corrected propagation model path loss formula, this paper link budget analysis, according to the parameter information transceiver get down the link budget for later covered to lay the foundation for the analysis of measured data used in this paper. Shanghai is in a dense urban area to collect CW data, including data sampling point information and effective GIS level information, the data processing is implemented in the MATLAB platform, including the use of the 2 dimensional GIS software is developed on the matlab/GUI platform.
The measured CW data of LTE system were model correction, correction results show that the correction of large scale propagation model in complex geomorphic environment of dense urban area, the improved algorithm makes the minimum prediction error data, the corrected propagation model accuracy is greatly improved, and the results show that the improved algorithm can effectively reflect the local propagation environment.

【學(xué)位授予單位】：東華大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN929.5

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本文編號：1763839