针对当前LPWA网络对覆盖范围、数据传输可靠性、功耗、系统成本等要求，本课题首先提出利用本地Capture &SIC、空时SIC以及按需的网络MIMO技术，解决在高密度传感器节点、大范围网络覆盖下的可靠数据传输问题；其次，根据超窄带调制的高效性以及抗干扰能力，分析研究UNB相关的调制、解调方法、滤波器设计以及集成FEC、DSSS和UNB等整个系统的抗干扰性能，从而将UNB技术应用于LPWA网络；再者，基于Capture & SIC要求，研究最优的GWs位置和COPY包数，在保证数据通信可靠性前提下，减小系统安装和运营成本、减少功耗；最后，设计LPWA网络无线传感器节点工作于Transmit-Only和Transmit-Mostly两种工作模式，研究两种模式下的无缝ALOHA和分集时隙ALOHA接入协议，并针对不同的QOS要求，设计随机ALOHA结合优先级分级的时隙预留信道接入协议。

Based on requirements to wide coverage, reliable transmission, low energy and low system cost, etc, for current Low Power Wide Area Network (LPWAN), the technologies of local Capture & Successive Interference Cancelation (SIC)，Space-time SIC, Network MIMO on demand are suggested firstly to resolve reliable communication in the application of high density sensor nodes, wide area coverage. Secondly, considering to the property of efficiency and anti-interference of Ultra Narrow Band(UNB) modulation, we will research the methods of modulation and demodulation, design the filter for UNA and estimate anti-interference specialty of globe system integrated in FEC, DSSS and UNB, etc，then, apply UNB into the LPWA networks. Thirdly, on the requirements of Capture & SIC, the optimized location and number of packet COPY is researched and designed to decrease installing and maintaining cost, battery energy on the constrain of reliable transmission. Finally, two working mode of Transmit-Only and Transmit-Mostly is suggested for the sensor nodes of LPWA network and the Frameless ALOHA and Diversity Slot ALOHA access protocol will be researched for the two working mode. Furthermore, the MAC protocol of integrated in random ALOHA and Slot reserved based on classified priorities will be designed.