1. Stealth Cognitive Radio With MIMO Active Interference Cancellation and V-BLAST Date: 2007.10.19 Speaker: 王貞傑 指導教授 : 吳仁銘

2. Outline AIC Algorithm simulation V-blast Algorithm simulation MIMO-AIC

3. Active Interference Cancellation (AIC) Algorithm

6. Minimization

7. Active Interference Cancellation (AIC) Simulation

9. Outline AIC Algorithm simulation V-blast Algorithm simulation MIMO-AIC

10. Vertical Bell Laboratories Layered Space-Time (V-BLAST) Encoding

11. Vertical Bell Laboratories Layered Space-Time (V-BLAST) Decoding

13. Initialization: Recursion:

14. V-Blast Simulation

15. Outline AIC Algorithm simulation V-blast Algorithm simulation MIMO-AIC

16. Assumptions: The channel is random, flat-fading or quasi-static, frequency independent (but changing from frame to frame is accepted or that is to say this rule constrains inside a frame). The channel gains, signals and noise are independent. Perfect channel state information (CSI) should be assumed to be available at the receiver end. We have assumed perfect timing and synchronization so that there’s no more degradation. The noise vector is complex AWGN. we have already known first transmitter data sequence so as to operate the AIC action at second receiver to clean interference from both transmitters.

17. MIMO-AIC Assumptions: QPSK Oversampling rate=4 Final oversampling rate (comparison)=20 2x2 UWB channel ( CM1~CM4) Tx1 :data Tx2 :AIC (around preserved band) data (left subcarriers)

18. MIMO-AIC

19. MIMO-AIC(1)

22. MIMO-AIC(2)

25. More analysis for Victim part and AIC part

27. Reference H. Yamaguchi, “Active Interference Cancellation Technique for MB-OFDM Cognitive Radio,” Microwave Conference, 2004. 34th European Volume 2, pp.1105-1108, 13 Oct. 2004. P. W. Wolniasky, G. J. Foschini, G.D. Golden, and R. A. Valenzuela. “V-blast: An architecture for realizing very high data- rates over the rich-scattering wireless channel,” Proc. IEEE ICC- 00, New Orleans, LA, USA, 18-22 June 2000. http://mimo.cm.nctu.edu.tw/Courses/Special_Topics_on_DSP_20 07.htm, Ta-Sung Lee, Signal Processing for Wireless Communications, spring semester in 2007.http://mimo.cm.nctu.edu.tw/Courses/Special_Topics_on_DSP_20 07.htm