| Popis: |
We construct and test a novel, simple yet flexible architecture based on software-defined radio for 5G IoT network. In our system, separation of radios and baseband processing facilitates sharing of radio heads among different L1 or L2 standards, while centralization of processing unit allows sharing of computation resources, coordination of radio heads and easier management. A problem is raised about how to dynamically assign a large number of radio heads in a network with vastly different transmitter counts and locations. We therefore propose a low-complexity antenna distribution algorithm which we prove is optimal for the lowest system error rate. In addition, the fact that our algorithm changes assignment incrementally makes it more suitable for time- varying networks. We construct a testbed according to this architecture. High integration and cost reduction are achieved by the use of a single ARM+FPGA system-on-chip. Experiment results show the system exhibits near ultra-low latency with high reliability. These characteristics combined with the reconfigurability of both ARM and FPGA make the system an ideal choice for real-time, highly reliable and multi-standard IoT applications. |
