Spectrum Usage In Madrid (20150331) When Some Dvb-T Channels Were Switched Off

This dataset represents the spectrum usage in Madrid city on 31st of March 2015 between 02:00 am and 04:00 am. Some DVB-T channels stopped transmitting (~800-860MHz) to make room for 4G networks. The spectrum was scanned using a RTL-SDR device connected to a RPi unit. The dataset is a CSV file with the following structure. Pear each line you have: TimeStamp (seconds) , frequency(Hz) , Signal Power (dB)本数据集记录了2015年3月31日凌晨2时至4时，马德里市的无线电频谱使用状况。当时部分数字视频地面广播（DVB-T）频道暂停了约800-860MHz频段的信号传输，以腾出频谱资源用于4G网络部署。本次频谱扫描通过连接至树莓派（RPi）单元的RTL-SDR设备完成。该数据集为CSV格式文件，其结构如下：每一行依次包含时间戳（单位：秒）、频率（单位：赫兹）以及信号功率（单位：分贝）。