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

Dataset that 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02:00至04:00期间马德里市的无线电频谱使用情况。为给4G网络腾出频谱资源，部分数字视频广播-地面（DVB-T）频道暂停了约800-860MHz频段的信号传输。本次频谱扫描采用连接至树莓派（RPi）单元的RTL-SDR设备完成。 本数据集为逗号分隔值（CSV）文件，结构如下：每一行依次包含时间戳（单位：秒）、频率（Hz）以及信号功率（dB）。