本文關(guān)鍵詞：下一代無線局域網(wǎng)關(guān)鍵技術(shù)研究　出處：《北京郵電大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

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【摘要】：無線局域網(wǎng)(Wireless Local Area Network, WLAN)是一種以無線電波作為傳輸媒介,傳輸距離一般只有幾十米的數(shù)據(jù)通信系統(tǒng)。無線局域網(wǎng)的出現(xiàn)是為了補(bǔ)充和擴(kuò)展有線連網(wǎng)方式,使得網(wǎng)絡(luò)接入方式更加靈活,使數(shù)據(jù)傳輸更加便利。隨著通信技術(shù)的發(fā)展,無線局域網(wǎng)也得到了飛速的發(fā)展,如多輸入多輸出、正交頻分多址、預(yù)編碼等通信行業(yè)近十年來的優(yōu)秀技術(shù)將無線局域網(wǎng)的性能推升到了一個(gè)前所未有的高度。 IEEE802.11作為無線局域網(wǎng)的主流標(biāo)準(zhǔn),也處于不斷更新和完善的狀態(tài)。由最初的802.11到經(jīng)典的802.11n到如今的802.11ac和802.11a]1,無線局域網(wǎng)的性能指標(biāo)已經(jīng)發(fā)生了翻天覆地的變化,無線通信的用戶數(shù)也已呈爆炸性增長。無線通信業(yè)務(wù)的進(jìn)一步發(fā)展,對(duì)系統(tǒng)的傳輸速率和傳輸質(zhì)量都提出了更高的要求,而對(duì)應(yīng)的無線資源尤其是頻譜資源越來越緊張。因此如何利用有限的無線資源完成更加高效且優(yōu)質(zhì)的數(shù)據(jù)傳輸,正在成為無線局域網(wǎng)未來發(fā)展的焦點(diǎn)。 本文對(duì)當(dāng)前無線局域網(wǎng)在高密度和超高吞吐兩種場景下的最新協(xié)議IEEE802.11ah和IEEE802.11ac進(jìn)行了跟蹤研究,并提出了具有一定性能優(yōu)勢的新方案。首先,在原協(xié)議方案的基礎(chǔ)上添加了預(yù)編碼技術(shù),降低系統(tǒng)中其他用戶或其他天線引入的干擾；然后通過使用旋轉(zhuǎn)調(diào)制和分量交織技術(shù),聯(lián)合提高系統(tǒng)分集增益；最后提出了基于預(yù)編碼技術(shù)的聯(lián)合編碼調(diào)制分集方案,相比于原無線局域網(wǎng)方案有較大的性能提升。除此之外,本文通過搭建基于無線局域網(wǎng)協(xié)議IEEE802.11ah的MAC層和物理層聯(lián)合仿真系統(tǒng),綜合考慮仿真了MAC層各種信道監(jiān)聽機(jī)制和物理層場景、用戶數(shù)對(duì)系統(tǒng)吞吐的影響,具有前沿的實(shí)踐意義。
[Abstract]:Wireless LAN (Wireless Local Area Network, WLAN) is a kind of radio waves as the transmission medium, transmission distance is generally only tens of meters of the data communication system. The wireless LAN is to supplement and extension of wired networking, the network access method is more flexible and makes data transmission more convenient. With the development of communication technology, wireless LAN has been rapid development, such as multiple input multiple output orthogonal frequency division multiple access, precoding, communications industry outstanding technology in recent ten years, the performance of wireless LAN push up to a hitherto unknown height.
IEEE802.11 as the mainstream standard of wireless LAN, is constantly updated and improved. From the initial 802.11 to classic 802.11n to today's 802.11ac and 802.11a]1, the performance index of wireless LAN has changed turn the world upside down changes, the number of users of wireless communication has been explosive growth. The further development of wireless communication services, all put forward higher requirements on the transmission rate and quality of the system, and the wireless resources corresponding to the particular spectrum resource becomes more and more nervous. So how to utilize the limited resources to complete data transmission more efficient and high quality, is becoming the focus of the future development of wireless LAN.
This paper studied the process of the current wireless LAN protocol in the latest high density and ultra high throughput two scenarios of IEEE802.11ah and IEEE802.11ac, and proposes a new scheme has certain performance advantages. Firstly, adding pre encoding technology based on the original protocol scheme, reduce the interference introduced by other users or other antenna system; then by using rotating modulation and component interleaving technology, combined with higher diversity gain; finally proposed joint encoding and modulation diversity scheme based on pre encoding technology, compared to the original wireless LAN scheme can significantly improve the performance. In addition, this paper builds the MAC layer and physical layer simulation system of wireless LAN protocol IEEE802.11ah based on considering the simulation of the MAC layer and physical layer channel monitoring mechanism of various scenes, the number of users of the system throughput, with the front edge of the Practical significance.

【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】：2015
【分類號(hào)】：TN925.93

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本文編號(hào)：1380905