Publications

1. A. Kortun, T. Ratnarajah, M. Sellathurai, Caijun Zhong, C. Papadias, “On the Performance of Eigenvalue-based Cooperative Spectrum Sensing for Cognitive Radio,” IEEE Journal of Selected Topics in Signal Processing, Vol 5, No. 1, pp. 49-55, Feb. 2011.
2. E. Tsakalaki, O. N. Alrabadi, C. B. Papadias, R. P. Prasad, “Spatial Spectrum Sensing for Wireless Handheld Terminals: Design Challenges and Novel Solutions Based on Tunable Parasitic Antennas,” IEEE Wireless Communications Magazine, Special Issue on Dynamic Spectrum Management, vol. 17, no. 4, pp. 33-40, Aug. 2010.
3. C. Zhong, T. Ratnarajah, and K-K Wong, “Outage Analysis of Decode-and-Forward Cognative Dual-Hop Systems with Interference Constraint in Nakagami-m Fading Channels“, IEEE Trans on Vehicular Technology, in press.
4. C. Zhong, M. R. McKay, T. Ratnarajah and K. K Wong, “Distribution of the Demmel Condition Number of Wishart Matrices," IEEE Trans on Communications, Vol. 59, pp. 1309-1320, May 2011.
5. C. Zhong, S. Jin, K.-K. Wong, M.-S. Alouini, and T. Ratnarajah, “Low SNR Capacity for MIMO Rician and Rayleigh-Product Fading Channels with Single Co-channel Interferer and Noise” IEEE Trans. on Communications, Vol. 58, pp. 2549-2560, Sep. 2010.
6. E. P. Tsakalaki, O. N. Alrabadi, C. B. Papadias, R. Prasad, “Adaptive reactance-controlled antenna systems for MIMO applications,” IET J. Microwaves, Antennas & Propagation, special issue RF/Microwave Commun. Subsystems for Emerging Wireless Technologies, in press.
7. O. N. Alrabadi, C. Divarathne, P. Tragas, A. Kalis, N. Marchetti, C. B. Papadias, and Ramjee Prasad, “Spatial Multiplexing with a Single Radio: Proof-of-Concept Experiments in an Indoor Environment with a 2.6-GHz Prototype,” IEEE Communications Letters, vol. 15, No. 2, pp. 178-180, Feb. 2011.
8. O. Alrabadi, C. B. Papadias, A. Kalis, N. Marchetti and R. Prasad, “MIMO transmission and Reception Techniques Using Three Element ESPAR Antennas”, IEEE Communications Letters, vol. 13, No. 4, pp. 236-238, April 2009.
9. O. N. Alrabadi, J. Perruisseau-Carrier, and A. Kalis, “MIMO transmission using a single RF source: theory and antenna design,” IEEE Trans. Antennas and Wireless Propagation, 2011, in press.
10. M. Matthaiou, C. Zhong and T. Ratnarjah, “Novel Generic Bounds on the Sum Rate of MIMO ZF Receivers”, IEEE Trans on Signal Processing, in press.
11. L. Li, and M. Pesavento, "The Sum Capacity of Underlay Cognitive Broadcast Channel," In the ICST Conference on Cognitive Radio Oriented Wireless Networks (Crowncom 2011), Yokohama, Japan, May-June 2011.
12. L. Li, F. A. Khan, M. Pesavento and T. Ratnarajah, “Power Allocation and Beamforming in Overlay Cognitive Radio Systems”, IEEE 73rd Vehicular Technology Conference (VTC2011-Spring), Budapest, Hungary, 15-18 May 2011.
13. F. Negro, S. P. Shenoy, I. Ghauri, D.T.M. Slock, “Interference alignment feasibility in constant coefficients MIMO interference channels,” 11th IEEE International Workshop on Signal Processing Advances in Wireless Communications(SPAWC 2010), Marrakech, Morocco , pp 1-5, 20-23 June, 2010.
14. F. Negro, I. Ghauri, D.T.M. Slock, “Optimizing the noisy MIMO interference channel at high SNR,” 48th Allerton Conference on Communication, Control and Computing, Monticello, Illinois, USA , pp 254-261, September 29-October 1, 2010.
15. T. Ratnarajah, C. Zhong, A. Kortun and M. Sellathurai, “Complex Random Matrices and Multiple antenna Spectrum Sensing,” In Proc. the IEEE 36th International Conference on Acoustics, Speech and Signal Processing, Prague, Czech Republic, May 22-27, 2011.
16. W. Guibene, A. Hayar, M. Turki, “Distribution discontinuities detection using algebraic technique for spectrum sensing in cognitive radio networks”, In proc. CrownCom 2010, 5th International Conference on Cognitive Radio Oriented Wireless Networks and Communications, June 9-11, 2010, Cannes, France.
17. B. Zayen, W. Guibene, A. Hayar, “Performance comparison for low complexity blind sensing techniques in cognitive radio systems”, in proc. CIP'10, 2nd International Workshop on Cognitive Information Processing, June 14-16, 2010, Elba Island, Tuscany, Italy.
18. H. Moussavinik, W. Guibene, A. Hayar, “Centralized Collaborative Compressed Sensing of Wideband Spectrum for Cognitive Radios”, in proc. ICUMT 2010, International Conference on Ultra Modern Telecommunications, Oct. 18-20, 2010, Moscow, Russia.
19. W. Guibene, A. Hayar, “Joint Time-Frequency Spectrum Sensing for Cognitive Radio”, Best Student Paper Award CogART 2010, 3rd International Workshop on Cognitive Radio and Advanced Spectrum Management, Nov. 07-10, 2010, Rome, Italy.
20. E. P. Tsakalaki, O. N. Alrabadi, C. B. Papadias, R. Prasad, “Spatial Spectrum Sensing for Cognitive Radios via Minaturized Parasitic Antenna Systems,” 5th International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom), pp. 1-5, Cannes, France, June 2010.
21. S.-M. Omar, D.T.M. Slock, O. Bazzi, “Bayesian Blind FIR Channel Estimation Algorithms in SIMO Systems,” IEEE Workshop on Statistical Signal Processing (SSP), Nice, France, June 2011.
22. S.-M. Omar, D.T.M. Slock, O. Bazzi, “Bayesian Semi-Blind FIR Channel Estimation Algorithms in SIMO Systems,” 12th IEEE International Workshop on Signal Processing Advances in Wireless Communications (SPAWC), San Francisco, USA, June 2011.
23. I. Wajid, M. Pesavento, Y.C. Eldar, and A.B. Gershman, "Robust downlink beamforming for cognitive radio networks," IEEE Global Communications Conference (GLOBECOM'10), December 2010, Miami, FL, USA.
24. I. Wajid, H. Nikolaeva, and M. Pesavento, "Iterative Robust Downlink Beamforming in Cognitive Radio Networks," In ICST Conference on Cognitive Radio Oriented Wireless Networks (CROWNCOM'11), Yokohama Japan, May-June 2011.
25. C. Masouros, T. Rantarajah, “Utilization of primary-secondary cross-interference via adaptive precoding in cognitive relay assisted MIMO wireless systems," IEEE Int. Conf. Commun. (ICC), Kyoto, Japan, June 2011.
26. E. P. Tsakalaki, O. N. Alrabadi, C. B. Papadias, R. Prasad, “Analogue orthogonal precoding using reduced-complexity transceivers,” IEEE Int. Symp. Antennas and Propag. and USNC/URSI National Radio Science Meeting, Spokane, Washington, July 2011.
27. E. P. Tsakalaki, O. N. Alrabadi, C. B. Papadias, R. Prasad, “An adaptive reactance-assisted antenna system for the MIMO uplink," 17th IEEE Int. Conf. Electronics, Circuits, and Systems (ICECS), pp. 1228-1231, Athens, Greece, Dec. 2010.
28. F. Negro, I. Ghauri, D.T.M. Slock, “On Duality in the MISO Interference Channel," 44th Asilomar Conference on Signals, Systems, and Computers, California, USA, November 7-10, 2010.
29. F. Negro, S. P. Shenoy, I. Ghauri, D.T.M. Slock, “Weighted sum rate maximization in the MIMO interference channel,” 21st Annual IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC 2010), Istanbul, Turkey , pp 684-689, September 26-29, 2010.
30. F. Negro, I. Ghauri and  D.T M. Slock, “Deterministic Annealing Design and Analysis of the Noisy MIMO Interference Channel," IEEE Information Theory and Applications Workshop (ITA 2011), San Diego, January 6-February 11, 2011
31. H. Du, and T. Ratnarajah, "Transmit Beamforming in MIMO Cognitive Radio Network via Semidefinite Programming", IEEE 73rd Vehicular Technology Conference: VTC2011.
32. H. Zhou, T. Ratnarajah and Y-C Liang, “On Secondary Network Interference Alignment in Cognitive Radio”, The IEEE International Dynamic Spectrum Access Networks (DySPAN) symposium, Aachen, Germany, May 3-6, 2011.
33. C. Bonnet, D. Camara, R. Ghaddab, A. Hayar, L. Iacobelli, F. Kaltenberger, R. Knopp, B. Mercier, N. Nikaein, D. Nussbaum, E. Yilmaz, B. Zayen, "OpenAirInterface and Agile Spectrum Access", IEEE DySPAN'11, International Dynamic Spectrum Access Networks Symposium, May 3-6, 2011, Aachen, Germany.
34. F. A. Khan, T. Ratnarajah and S. Prakriya, “Outage Performance of Causal Cognitive Radio Z-interference Fading Channel with Cognitive Relaying”, International Conference on Signal Processing and Communications 2010 (SPCOM 2010), Bangalore India, July 18-21 2010
35. F. A. Khan, T. Ratnarajah and S. Prakriya, “Outage Analysis of Cognitive Z-interference channel with Two-path Cognitive Relaying”, Second UK-India-IDRC International Workshop on Cognitive Wireless Systems (UKIWCWS), New Delhi, India, December 13-14 2010
36. K. Cumanan, A. B. Gershman, et al., “SINR Balancing Technique for Downlink Beamforming in Cognitive Radio Networks,” IEEE Signal Processing Letters, vol. 17, No. 2, pp. 133-136, Feb. 2010. 
37. M. Z. I. Sarkar, T. Ratnarajah, and M Sellathurai, "On the Outage Behavior of Cognitive Relay Assisted MIMO Multiple Access Channel," In Proc. IEEE First International Workshop on Cognitive Wireless Cloud Networks (in conjunction with PIMRC'09), Tokyo, Japan, Sep. 13, 2009 (invited paper).
38. M. Pesavento, D. Ciochina, A.B. Gershman, "Iterative Dual Downlink Beamforming for Cognitive Radio Networks," In Proc. International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2010), Cannes, France, June 9-11, 2010 , BEST PAPER AWARD.
39. M. Z. I. Sarkar, T. Ratnarajah and M. Sellathurai, "Outage Performance of MIMO Multiple Access Interference Channel with Cognitive Relay," In Proc. the IEEE International Conference on Communications (ICC 2010), Cape Town, South Africa, May 23-27, 2010.
40. O. N. Alrabadi, N. Marchetii, A. Kalis, C. B. Papadias, R. Prasad, “A Novel Real OSTBC via a Single Radio,” In Proc. the IEEE International Conference on Communications (ICC 2010), Cape Town, Africa, May 23-27, 2010.
41. M. Z. I. Sarkar and T. Ratnarajah, "Outage Performance Analysis of SIMO Multiple Access Interference Channels with Cognitive Relay," In Proc. The IEEE International Dynamic Spectrum Access Networks (DySPAN) symposium, Singapore, Apr. 6-9, 2010.
42. A. Kortun, T. Ratnarajah, M. Sellathurai and C. Chong, "On the Performance of Eigenvalue-based Spectrum Sensing for Cognitive Radio," In Proc. The IEEE International Dynamic Spectrum Access Networks (DySPAN) symposium, Singapore, Apr. 6-9, 2010.
43. H. Zhou and T. Ratnarajah, "Novel Interference Draining Scheme for Cognitive Radio based on Interference Alignment," In Proc. The IEEE International Dynamic Spectrum Access Networks (DySPAN) symposium, Singapore, Apr. 6-9, 2010.
44. Sudharsan Ganesan; Mathini Sellathurai; T. Ratnarajah, “Opportunistic Interference Alignment in Cognitive MIMO Radio with Limited Feedback,” In Proc. The IEEE International Dynamic Spectrum Access Networks (DySPAN) symposium, Singapore, Apr. 6-9, 2010.
45. O. N. Alrabadi and C. B. Papadias, “A Novel Alamouti Transmission Technique via a Single RF Source and a Miniaturized Antenna System,” In Proc. the IEEE The Eleventh IEEE International Workshop on Signal Processing Advances in Wireless Communications (SPAWC 2010), Marrakech, Morocco, June 20-23, 2010.
46. J. Perruisseau-Carrier, O. N. Alrabadi, and A. Kalis, “Implementation of a Reconfigurable Parasitic Antenna for Beam-Space BPSK Transmissions,” In Proc. the European Wireless Technology Conference (EuWiT), Paris, Sept. 27-28, 2010.
47. S.-M. Omar, D.T.M. Slock and O. Bazzi, “Receiver Diversity with Blind and Semi-Blind FIR SIMO Channel Estimates,” In Proc. IEEE Int. Symposium on Communications, Control and Signal Processing (ISCCSP),  Limassol, Cyprus, March, 2010.
48. S.-M. Omar and D.T.M. Slock, “Variational Bayesian Blind and Semiblind Channel Estimation,” In Proc. IEEE Int. Symposium on Communications, Control and Signal Processing (ISCCSP),  Limassol, Cyprus, March, 2010.
49. F. Negro, S. P. Shenoy, I. Ghauri and D.T. M. Slock, “On the MIMO Interference Channel ,” In Proc. Information Theory and Applications Workshop (ITA), 2010 , San Diego, California, USA, February 2010.
50. F. Negro, I. Ghauri and D.T. M. Slock, “Transmission techniques and channel estimation for spatial interweave TDD cognitive radio systems,” In Proc. 43rd Asilomar Conference on Signals Systems and Computers, Pacific Grove, California, USA, November, 2009.
51. F. Negro, S. P. Shenoy, D.T. M. Slock and I. Ghauri, “Interference alignment limits for K-user frequency-flat MIMO Interference Channels,” In Proc. European Signal Proc. Conf. (Eusipco), Glasgow, Scotland, August 2009.
52. A. Shukla, D. Stephens, J. Stoodley, “Cognitive Radio Business Models,” E3 Workshop on Business Models for Software Radio and Cognitive Radio Systems, Dec. 11, 2009, Brussels.
53. L. Li, M. Pesavento, A.B. Gershman, "On Ergodic Sum Capacity of Underlay Cognitive Broadcast Channels," In Proc. Personal, Indoor and Mobile Radio Communications (PIMRC 2010), Istanbul, Turkey, Sept. 26-30, 2010.
54. I. Wajid, M. Pesavento, Y.C. Eldar, A.B. Gershman, "Robust downlink beamforming for cognitive radio networks," In Proc. GLOBECOM 2010, 6-10 December 6-10, Miami, FL, USA.
55. E. Tsakalaki, O. N. Alrabadi, C. B. Papadias, R. P. Prasad, “Spatial Spectrum Sensing for Cognitive Radios via Minaturized Parasitic Antenna Systems,” In Proc. International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2010), Cannes, France, June 9-11, 2010.
56. Ayse Kortun, T. Ratnarajah and M. Sellathurai, “Exact Performance Analysis of Blindly Combined Energy Detection for Spectrum Sensing”, In Proc. Personal, Indoor and Mobile Radio Communications (PIMRC 2010), Istanbul, Turkey, Sept. 26-30, 2010.
57. F. A. Khan, T. Ratnarajah and M. Sellathurai, “Multiuser Diversity Analysis in Spectrum Sharing Cognitive Radio Networks”, In Proc. International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2010), Cannes, France, June 9-11, 2010.
58. E. Tsakalaki, O. N. Alrabadi, C. B. Papadias, R. P. Prasad, “Enhanced Selection Combining for Compact Single RF User Terminals in Multiuser Diversity Systems,” In Proc. Personal, Indoor and Mobile Radio Communications (PIMRC 2010), Istanbul, Turkey, Sept. 26-30, 2010.
59. F. Negro, I. Ghauri, and D. T.M. Slock, “Beamforming for the Underlay Cognitive MISO Interference Channel via UL-DL Duality,” In Proc. International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2010), Cannes, France, June 9-11, 2010.
60. F. Negro, I. Ghauri, and D. T.M. Slock, “Maximum Weighted Sum Rate Multi-User MIMO Amplify-and-Forward for Two-Phase Two-Way Relaying,” In Proc. Personal, Indoor and Mobile Radio Communications (PIMRC 2010), Istanbul, Turkey, Sept. 26-30, 2010.
61. F. Negro, S. P. Shenoy, I. Ghauri and Dirk Slock, “Weighted Sum Rate Maximization in the MIMO Interference Channel,” In Proc. Personal, Indoor and Mobile Radio Communications (PIMRC 2010), Istanbul, Turkey, Sept. 26-30, 2010.
62. M. Z. I. Sarkar, T. Ratnarajah and M. Sellathurai, "Outage Behavior of MIMO Cognitive Radio Fading Channels: A Causal Approach," In Proc. IEEE First UK-India International Workshop on Cognitive Wireless Systems (UKIWCWS 2009), IIT Delhi, India, December 11-12, 2009.
63. Faheem Khan, T. Ratnarajah, M. Sellathurai and Shankar Prakriya, "Outage Analysis of Causal Cognitive Radio Channel," In Proc. IEEE First UK-India International Workshop on Cognitive Wireless Systems (UKIWCWS 2009), IIT Delhi, India, December 11-12, 2009.
64. Sudharsan Ganesan; Mathini Sellathurai; T. Ratnarajah "Opportunistic Interference Alignment in Cognitive MIMO with Finite Rate Feedback," In Proc. IEEE First UK-India International Workshop on Cognitive Wireless Systems (UKIWCWS 2009), IIT Delhi, India, December 11-12, 2009.