An FPGA-Based Implementation of a Multifunction Environment Sensing Device for Shared Access With Rotating Radars
| Autor: | Zaheer Khan, Matti Latva-aho, Janne Lehtomaki, Alan G. Marshall, Ekram Hossain |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
wireless platforms
Computer science spectrum measurements spectrum access system 02 engineering and technology law.invention Signal strength radars law 0202 electrical engineering electronic engineering information engineering Wireless field-programmable gate array (FPGA) Electrical and Electronic Engineering Radar Field-programmable gate array Instrumentation database business.industry 020208 electrical & electronic engineering Detector 020206 networking & telecommunications shared spectrum access environmental sensing capability (ESC) devices prototype business Computer hardware 5G Communication channel temporal sharing (TS) |
| Zdroj: | IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT |
| Popis: | To protect radar receivers and to facilitate shared access in radar bands, regulatory bodies have recommended the use of spectrum monitoring devices called environmental sensing capability (ESC). High-speed and low-cost ESC devices are required to process in real time the large amount of data (in-phase and quadrature samples) for the detection of radar signals and to differentiate them from secondary users (SUs) signals. In this paper, we present a field-programmable gate array (FPGA)-based design and implementation of a multifunction ESC device that can detect radar pulses and can also differentiate them from SU signals in microsecond time scales. The proposed ESC device performs the following tasks in parallel: 1) it detects and differentiates between radar and SU signals; 2) it measures received signal strength from SUs for radar protection; and 3) it also measures SUs’ airtime utilization (ATU) in a channel, which can be used to perform load balancing (based on ATU) of SUs on different channels for efficient access. Detection of signals requires threshold setting. We present a novel minimum-based threshold setting technique, which is suitable for real-time operation of energy detectors. We implement a prototype of the proposed ESC device design on a Wireless Open-Access Research Platform node, which is equipped with a Xilinx FPGA. We evaluate the performance of the implemented device and show that with very high probability (close to 100%), it detects and differentiates between radar and SU signals. Moreover, it also accurately measures the ATU of SUs. |
| Databáze: | OpenAIRE |
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