Spectrum Sensing with Software Radios

Progress Presentation

Team members: Eun Kim, Suen Guy Min, and Matt DolterAdvisor: Dr. Zhengdao WangGroup: May-1006

Project Plan

1st Semester Spent most of the time learning▪ Cognitive Radio, USRP, GNURadio, Linux, Python

2nd Semester Develop sensing program Research sensing parameters

Key USRP Concepts ADC rate (64MHz) -> decimation (20) -> quad rate

(3.2MHz) -> sample size (32bits/sample) -> bps rate (102.4Mbits/second) -> byte rate (12.8Mbytes/second)

12.8 MB/s is less than 32 MB/sec supported by USB

Project Design

Sensing Method Energy Detector

Considered Spectrum 100-800 MHz

Sensing Hardware USRP

Software Python and

GNURadio

Research Areas Spectrum

Characteristics Noise Criterion Sensing Time Sensing Accuracy

Detailed Block Diagram of Signal Transformations

Plot Entire Spectrum FFT

Plot of Channel Averages

0 10 20 30 40 50 60 70 800

1

2

3

4

5

6

7

8

9

10

Plot of Average Power of US DTV Channels

US Digital TV Channels

Avera

ge P

ow

er

KCCI IA DES MOINES 31 On the airKDIN IA DES MOINES 50 On the airKDMI IA DES MOINES 56 Authorized to program testKDSM IA DES MOINES 16 On the airWHO- IA DES MOINES 19 Authorized to program test

Initial Sensing Time Plot

0.01 0.02 0.025 0.05 0.1 0.2 0.25 0.5 1 2 4 6 822.15

22.20

22.25

22.30

22.35

22.40

22.45

22.50

22.55

22.60

Power of fc=103 MHz

Time (s)

Pow

er

Remaining Time Plan