1. Cooperative Spectrum Sensing for Cognitive Radios

2. 26% highest efficiency for busiest band

3. 13.1% Efficiency in NYC

4.  $20 BILLION for 60 MHz

6. Primary User Secondary User 3 Secondary User 2 Secondary User 1 Common Receiver

7.  Energy Detection  Matched Filter Detection  Cyclostationary Detection  Wavelet Detection  Performance

9. x[n]y[n] Compare to template Decide H0 or H1

13.  Intro to CSS  Performance of CSS  Cooperative Diversity CSS  Relay Diversity CSS  Multiuser Diversity CSS  Censored Decision CSS  Asynchronous CSS

14. Primary User Secondary User 3 Secondary User 2 Secondary User 1 Common Receiver

19. λ1λ1 λ2λ2 Ambiguous H0H1

20. Primary User Secondary User 3 Secondary User 2 Secondary User 1 Common Receiver