Thanks, Mike. Then how should I calculate the power for each channel? We have analog and digital channels.
已通过MOTOBLUR™连接 -----原始信息----- 来自: Mike Jameson <m...@scanoo.com> 收件人： Jincheng Zhang <perfume0...@gmail.com> 抄送: "discuss-gnuradio@gnu.org" <discuss-gnuradio@gnu.org> 已发送: 2013-04-07, 周日, 16:39:05 格林尼治标准时间+0000 主题: Re: [Discuss-gnuradio] usrp_spectrum_sense.py FFT bin values are all zero. Hi, For your application, please experiment with the following command: ./usrp_spectrum_sense.py -A TX/RX --fft-size=25 --samp-rate=25e6 --gain=15 --dwell-delay=0.25 --tune-delay=0.25 --channel-bandwidth=8e6 470e6 800e6 Note that 'freq_step' should remain unchanged at '0.75 * usrp_rate' in the script to make sure signals at the edge of the incoming front-end signal bandwidth (25MHz) are not missed. Mike -- Mike Jameson M0MIK BSc Email: m...@scanoo.com Web: http://scanoo.com On 7 April 2013 17:22, Jincheng Zhang <perfume0...@gmail.com> wrote: > Thanks Mike. I'm a little confused. The parameters are listed as follows: > > sample-rate: > channel-bandwidth: > freq_step: > fft_size: > > You mean that I should set sample-rate be 25e6, channel-bandwidth be 8e6, > freq_step be 8e6 and fft_size be 25? > > If we set the fft-size be 25, then which 8 bins I should select to > calculate the power? By the way, since the magnitude of FFT bin is decimal, > maybe I should change the magnitude of FFT bin values to mw and add the 8 > bins, and then transfer to decimal again? Since we cannot straightly add > the FFT bin values in decimal. > > By the way, how about the "self.connect", should I add the log parameter > to it? > > Thanks. Hope for your reply. > > > > On Mon, Apr 8, 2013 at 12:11 AM, Mike Jameson <m...@scanoo.com> wrote: > >> Hi Jincheng, >> >> Try setting the UHD sample rate to 25e6 and the number of fft bins to 25 >> which will give you 1e6 Hz per bin. Adding
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