在不斷發(fā)展的技術中,滿足這個智能世界的需求有許多屬性和挑戰(zhàn)。一些挑戰(zhàn)包括低功耗,低成本,低比特率,高安全性,可靠性,高性能和吞吐量,能耗等。自上幾年以來,許多技術已經(jīng)出現(xiàn),旨在克服上述挑戰(zhàn)。已經(jīng)引入了一種稱為LPWAN-低功率廣域網(wǎng)的無線電技術,其用于不同IoT應用和M2M中的無線數(shù)據(jù)通信。具有僅傳輸節(jié)點的網(wǎng)絡由于其在以低成本和低能耗的長期部署中的優(yōu)勢而吸引更多。僅傳輸具有缺少接收器的缺點的節(jié)點,使得大多數(shù)現(xiàn)有MAC協(xié)議無效。以前的許多研究都集中在純傳輸節(jié)點上,這些節(jié)點具有一些優(yōu)點和缺點。在僅傳輸節(jié)點的情況下,不能接收接收器數(shù)據(jù)確認。這使得學者們專注于傳輸主要節(jié)點,這些節(jié)點確認云/服務器上成功的數(shù)據(jù)包接收。但是在傳感器中加入接收器也有許多缺點,例如增加,功率成本,系統(tǒng)成本和延遲等。考慮到所有這些,一些研究集中在僅傳輸節(jié)點打開接收模塊以在預定時間內轉換為公共節(jié)點當服務器可以分發(fā)配置命令等時,只持續(xù)很短的時間。我也把它帶到了我的研究中。為了提高PDR(數(shù)據(jù)包傳輸率)并減少接收信號的延遲,我的論文提出了一種CRDSA MAC協(xié)議設計。有許多MAC協(xié)議有助于避免沖突并提供更好的PDR和吞吐量結...

【文章頁數(shù)】：96 頁

【學位級別】：碩士

【文章目錄】：
Acknowledgement
摘要
ABSTRACT
Preface
1. Introduction
    1.1 IOT
    1.2 LPWAN
    1.3 Transmit-only
    1.4 Transmit-mostly
    1.5 MIMO
        1.5.1 Types of MIMO systems
    1.6 Research Scope
        1.6.1 Problem Definition
        1.6.2 Literature Review
        1.6.3 Research Goal
        1.6.4 Research Goal Execution
        1.6.5 Experimental Design
        1.6.6 Expected Result and significance
2. LOW POWER WIDE AREA NETWORK (LPWAN)
    2.1 Low Power Wide Area Network (LPWAN)
        2.1.1 Key Features of LPWAN
        2.1.2 LPWA Applications
        2.1.3 LPWA Future Perspective and Challenges
    2.2 Overview of Current LPWA Technologies
        2.2.1 LoRa WAN
        2.2.2 Sigfox
        2.2.3 Narrowband IoT (NB-IoT)
        2.2.4 Long Term Evolution-MTC (LTE-M)
        2.2.5 Weightless-SIG
        2.2.6 Ingenu
        2.2.7 EC-GSM-IOT
3. MAC PROTOCOLS
    3.1 MAC Protocol
        3.1.1 ALOHA and its types
        3.1.2 CSMA
        3.1.3 Hybrid CSMA
        3.1.4 CSMA/CA
    3.2 MAC Protocol Designing concept
        3.2.1 Protocol between sensors and gateways
        3.2.2 Initialization Period
        3.2.3 Transmit-only Period
        3.2.4 Command feedback Period
        3.2.5 Transmit-only to Transmit-mostly
        3.2.6 Transmit-mostly to Transmit-only
        3.2.7 Protocol between gateways and server
4. Contention Resolution Diversity Slotted ALOHA (CRDSA)
    4.1 Methodology
        4.1.1 Simple Capture
        4.1.2 Capture-based on SIC (Local SIC)
        4.1.3 Capture-based on SIC (Global SIC)
        4.1.4 MIMO
    4.2 Code Flow
        4.2.1 Packet Delivery Ratio (PDR)～&～Latency:
        4.2.2 Simple Capture
        4.2.3 Successive Iterative Capture 2
        4.2.4 Successive Iterative Capture
        4.2.5 MIMO based System Using SIC
        4.2.6 CRDSA
    4.3 Simulation Results
5. Conclusion and future work
    5.1 Discussion on CRDSA
    5.2 Future Research Works in Short
        5.2.1 Introducing Combining techniques
        5.2.2 Different Channel and Load Conditions
        5.2.3 NMIMO
        5.2.4 Secure Data Transmissions
    5.3 Conclusion Perspective
References
Author Profile
    Education Credentials
    Academic-Projects
    Internships
Dataset for the Master's Thesis



本文編號：3836604