# IEEE 802.15.4 subsystem

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# IEEE 802.15.4 subsystem Commit Details

Date: | 2010-12-01 14:30:02 (8 years 11 months ago) |
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Author: | Werner Almesberger |

Commit: | fea4ee551a27612c3b481198c12aaf0b8cd3eec5 |

Message: | usrp/README: change threshold to avoid making section reference look
like a typo - usrp/README: changed threshold from 50 to 60, such that the reference "5)" right next to it doesn't look like a mistyped "50" |

Files: |
usrp/README (3 diffs) |

## Change Details

usrp/README | ||
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102 | 102 | This noise floor value is used to filter uninteresting samples later |

103 | 103 | on, removing a constant bias from the results. |

104 | 104 | |

105 | In this example, we'll use a noise floor value of -50 dB. | |

105 | In this example, we'll use a noise floor value of -60 dB. | |

106 | 106 | |

107 | 107 | 6) Determine the "interesting" frequency range. For this, we consider all |

108 | 108 | the spectra of the measurements: |

... | ... | |

129 | 129 | |

130 | 130 | 7) Obtain the peaks from all measurements |

131 | 131 | |

132 | gnuplot> plot "<for n in 100/tmp*; do ./fft -s 100 0 20 50 <$n;done" \ | |

132 | gnuplot> plot "<for n in 100/tmp*; do ./fft -s 100 0 20 60 <$n;done" \ | |

133 | 133 | with lines |

134 | 134 | ^ ^ ^ ^ |

135 | 135 | | | | | |

... | ... | |

142 | 142 | |

143 | 143 | 8) The final result for one measurement run can be obtained as follows: |

144 | 144 | |

145 | for n in 100/tmp*; do ./fft -s 100 0 20 50 <$n;done | ./range -v 2 | |

145 | for n in 100/tmp*; do ./fft -s 100 0 20 60 <$n;done | ./range -v 2 | |

146 | 146 | |

147 | 147 | In this example, "range" eliminates all outliers more than 2 dB from |

148 | 148 | the average and reports this. |