Robust Design For Massive Access In B5g Cellular Internet Of Things
2019 11TH INTERNATIONAL CONFERENCE ON WIRELESS COMMUNICATIONS AND SIGNAL PROCESSING (WCSP)(2019)
摘要
In this paper, we consider a beyond fifth-generation (B5G) cellular internet of things (IoT) with massive connectivity but sporadic IoT traffic. A grant-free random access scheme is designed to support massive access over limited radio spectrum. Firstly, device activity information and channel state information are obtained by using the same pilot sequences. Then, in order to alleviate the adverse impact of channel uncertainty on system performance, transmit powers and receive vectors of active devices are jointly optimized in the uplink data transmission phase with the goal of maximizing the weighted sum rate. Finally, extensive simulation results validate the effectiveness and robustness of the proposed scheme.
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关键词
B5G, massive access, activity detection, channel estimation, robust optimization
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