發(fā)布時(shí)間：2018-01-19 10:23

  本文關(guān)鍵詞： Wi-Fi Direct 安卓系統(tǒng) 信道選擇 wpa_supplicant 干擾避免　出處：《武漢郵電科學(xué)研究院》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著互聯(lián)網(wǎng)的不斷發(fā)展,中國正逐步進(jìn)入一個(gè)高速信息化的時(shí)代,移動(dòng)互聯(lián)網(wǎng)在網(wǎng)絡(luò)中所占的比重越來越大。智能手機(jī)作為移動(dòng)互聯(lián)網(wǎng)平臺(tái)中占比最大的接入設(shè)備,了解并掌握其技術(shù)與發(fā)展顯得十分重要。從2007年安卓被谷歌公司收購以來,它每一次更新?lián)Q代都備受全世界的關(guān)注。安卓系統(tǒng)憑借自身絢麗友好的界面設(shè)計(jì)和開放合作的商業(yè)模式給它帶來了巨大的成功。與此同時(shí)Wi-Fi作為一種便捷高效的無線局域網(wǎng)傳輸技術(shù),它的出現(xiàn)和發(fā)展大大地解放了傳統(tǒng)網(wǎng)絡(luò)設(shè)備移動(dòng)范圍受限的問題。自從安卓系統(tǒng)結(jié)合市場上較為流行的Wi-Fi Direct技術(shù)發(fā)布了Wi-Fi Display功能的產(chǎn)品以后,關(guān)于無線高清視頻傳輸技術(shù)的討論就從未停歇。Wi-Fi 2.4GHz頻段的網(wǎng)絡(luò)由于頻譜資源的緊缺性和來自類似藍(lán)牙等其他同頻無線設(shè)備的干擾的原因,加之為了滿足無線高清視頻傳輸對(duì)信號(hào)的實(shí)時(shí)性與穩(wěn)定性的需求,2.4GHz頻段上Wi-Fi信道的合理選擇就顯得尤為重要。本文首先簡要介紹安卓系統(tǒng)的組成結(jié)構(gòu)以及安卓系統(tǒng)中的關(guān)鍵技術(shù)知識(shí),研究Wi-Fi的物理特性以及802.11協(xié)議中使用到的關(guān)鍵類型MAC幀結(jié)構(gòu)。通過分析安卓系統(tǒng)中Wi-Fi部分的技術(shù)架構(gòu)與實(shí)現(xiàn)原理,重點(diǎn)研究了wpa_supplicant的代碼框架,研究分析了安卓系統(tǒng)中現(xiàn)行的Wi-Fi Direct信道選擇方案的不足,在現(xiàn)有方案基礎(chǔ)上通過程序優(yōu)化設(shè)計(jì)并編譯安卓系統(tǒng)源碼,以重寫手機(jī)Image文件的形式使安卓手機(jī)具有智能化的信道選擇功能。最后對(duì)方案優(yōu)化前后的手機(jī)設(shè)備進(jìn)行了對(duì)比實(shí)驗(yàn),通過在兩種不同無線環(huán)境下傳輸大容量文件進(jìn)行實(shí)驗(yàn)?zāi)M,通過觀察信道的自動(dòng)選擇、傳輸速率和傳輸時(shí)長來判斷Wi-Fi Direct通信質(zhì)量的優(yōu)劣。并在測試實(shí)驗(yàn)結(jié)果基礎(chǔ)上進(jìn)行了分析,實(shí)驗(yàn)結(jié)果顯示在Wi-Fi Direct通信過程中通過實(shí)現(xiàn)信道智能選擇,能夠較大程度的提升傳輸?shù)乃俾逝c穩(wěn)定性。論文創(chuàng)新點(diǎn)在于,通過系統(tǒng)軟件修改的方式較傳統(tǒng)硬件升級(jí)具有好的靈活性與可迭代性,用戶通過系統(tǒng)升級(jí)即可完成Wi-Fi Direct信道智能選擇。
[Abstract]:With the continuous development of the Internet, China is gradually entering a high-speed information age. The proportion of mobile Internet in the network is increasing. Smart phone is the largest access device in the mobile Internet platform. It's important to know and master its technology and development, since Android was acquired by Google in 2007. Every new generation of Android has attracted worldwide attention. Android has been a huge success with its gorgeous, friendly interface design and open and collaborative business model. At the same time, Wi-Fi is a convenience. Agile and efficient WLAN transmission technology. Its emergence and development have greatly liberated the problem of limited mobile range of traditional network devices. Wi-Fi has been released since Android combined with the more popular Wi-Fi Direct technology on the market. Display features later on in the product. Discussion of wireless HD video transmission technology has never stopped. Wi-Fi. The 2.4GHz band network is due to the scarcity of spectrum resources and interference from other co-frequency wireless devices such as Bluetooth. In addition, in order to meet the need of real-time and stability of wireless high-definition video transmission. The reasonable choice of Wi-Fi channel in 2.4 GHz band is very important. Firstly, this paper briefly introduces the structure of Android system and the key technology knowledge in Android system. This paper studies the physical characteristics of Wi-Fi and the key type of MAC frame structure used in 802.11 protocol, and analyzes the technical structure and implementation principle of Wi-Fi part in Android system. This paper focuses on the code framework of wpa_supplicant, and analyzes the shortcomings of the current Wi-Fi Direct channel selection scheme in Android system. On the basis of the existing programs through the optimization of the design and compilation of Android source code. In the form of rewriting mobile phone Image file, Android phone has intelligent channel selection function. Finally, the comparison experiment of mobile phone device before and after optimization is carried out. Experimental simulation is carried out through the transmission of large capacity files in two different wireless environments, and the automatic selection of observation channels is carried out. The quality of Wi-Fi Direct communication is judged by the transmission rate and the transmission time. The analysis is made on the basis of the test results. The experimental results show that in the process of Wi-Fi Direct communication, the rate and stability of transmission can be greatly improved by realizing the intelligent channel selection. The innovation of this paper lies in. The modification of the system software is more flexible and iterative than the traditional hardware upgrade. Users can select the Wi-Fi Direct channel intelligently through the system upgrade.
【學(xué)位授予單位】：武漢郵電科學(xué)研究院
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN929.53;TP311.52

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本文編號(hào)：1443753