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King Fahd University of Petroleum & Minerals

Electrical Engineering Department

Associate Professor

Oualid Hammi

 

My Publications

"Publish or perish!"

(last update: Feb. 27th, 2016)

 

Journal Papers                                                       Conference Papers

 
Books and Chapters
  1. F. M. Ghannouchi, O. Hammi, and M. Helaoui, “Behavioral Modeling and Predistortion of Wideband Wireless Transmitters”, John Wiley & Sons, Chichester, UK, Jun. 2015, ISBN: 978-1-118-40627-4.

  2. F. M. Ghannouchi O. Hammi, and M. Helaoui, “Digital Predistortion for Microwave Transmitters”, Invited Chapter for the Wiley Encyclopaedia of Electrical and Electronics Engineering, published online 16 Sep. 2014, DOI: 10.1002/047134608X.W8224.
     

 
Software
  1. F. M. Ghannouchi O. Hammi, A. Kwan, M. Helaoui, and T. Liu, “AMPS: Amplifiers Modeling and Predistortion Software”, commercialization pursued through Innovate Calgary. A free trial version is available at http://flintbox.com/public/project/23005 .

 

 
Patents
  1. O. Hammi, and S. Najmeddine, “Two-box polar model for transmitters' dynamic nonlinear distortions modeling and mitigation”: patent filed with the U.S. Patent and Trademark Office (USPTO) through KFUPM Intellectual Assets Office on February 22, 2016. Patent pending US15/050,424.

  2. O. Hammi, and M. O. H. Khalifa, “System level oriented load-pull based design of envelope tracking power amplifiers”: patent filed with the U.S. Patent and Trademark Office (USPTO) through KFUPM Intellectual Assets Office on November 24, 2015. Patent pending US14/951,470.

  3. A. I. Abdul-Rahman, O. Hammi, and A. Zerguine, “A novel weighted memory polynomial for LTE base stations power amplifiers behavioural modelling”: patent filed with the U.S. Patent and Trademark Office (USPTO) through KFUPM Intellectual Assets Office on November 10, 2014. Patent pending US14/537,843.

  4. O. Hammi, “Augmented twin-nonlinear two-box models for power amplifiers modeling and predistortion”: patent filed with the U.S. Patent and Trademark Office (USPTO) through KFUPM Intellectual Assets Office on December 9, 2013. Patent pending 14/101,256.

  5. O. Hammi, “Scalable digital predistortion system,” US9,214,969 B2; December 15, 2015. Patent granted by the U.S. Patent and Trademark Office (USPTO).

  6. O. Hammi, “Digital predistortion system and method with extended correction bandwidth,” US9,172,334 B2; October 27, 2015. Patent granted by the U.S. Patent and Trademark Office (USPTO).

  7. A. H. Abdelhafiz, O. Hammi, A. Zerguine, and A. T. Al-Awami, “Memory polynomial based digital predistorter,” US9,160,280 B1; October 13, 2015. Patent granted by the U.S. Patent and Trademark Office (USPTO).

  8. A. Ali, D.S. Owodunni, O. Hammi, and T. Al-Naffouri, “Joint compensation of power amplifier's distortions,” US9,137,082 B1; September 15, 2015. Patent granted by the U.S. Patent and Trademark Office (USPTO).

  9. O. Hammi, “Method for Memory Effects Quantification and Comparison in RF Transmitters and Amplifiers,” US8,897,728 B2; November 25, 2014. Patent granted by the U.S. Patent and Trademark Office (USPTO).
     

 
Journal Papers
  1. M. S. Sharawi, S. K. Dhar, O. Hammi, and F. M. Ghannouchi, “AMiniaturized active integrated antennas: A co-design approach,” IET Microw. Antennas Propag., (accepted).

  2. O. Hammi, M. O. Khalifa, A. Abdelhafiz, A. Kwan, A. Zerguine, M. S. Sharawi, and F. M. Ghannouchi, “A dual-input two-box model for behavioral modeling and predistortion of envelope tracking power amplifiers,” IEEE Microw. Wireless Compon. Lett., (accepted).

  3. M. S. Sharawi, S. K. Dhar, O. Hammi, and F. M. Ghannouchi, “An active integrated ultra-wideband MIMO antenna,” IEEE Trans. Antennas Propag., (accepted).

  4. A. I. Abdu-Rahman, O. Hammi, A. Kwan, A. Zerguine, and F. M. Ghannouchi, “A novel weighted memory polynomial for behavioral modeling and digital predistortion of nonlinear wireless transmitters,” IEEE Trans. Ind. Electron., vol. 63, no. 3, pp. 17451753, Mar. 2016.

  5. O. Hammi, M. H. Khan, A. Abdelhafiz, F. M. Ghannouchi, and M. S. Sharawi, “Complexity reduced behavioral modeling of dynamic nonlinear power amplifiers using two-box structures,” Wiley Microw. Opt. Technol. Lett., vol. 58, no. 3, pp. 726731, Mar. 2016.

  6. O. Hammi, and A. Miftah, “Complexity-aware-NMSE “CAN” metric for dimension estimation of memory polynomial based power amplifiers behavioral models,” IET Commun., vol. 9, no. 18, pp. 2227–2233, Dec. 2015.

  7. O. Hammi, “Efficient linear amplification using digitally predistorted overdriven power amplifiers,” IEEE Trans. Broadcast., vol. 61, no. 3, pp. 398–406, Sep. 2015.

  8. A. Seregin, O. Hammi, D. Wang, M. Helaoui, and F. M. Ghannouchi, “Modified linear prediction algorithm for narrow band interference suppression in Universal Mobile Telecommunication System,” Wireless Communications and Mobile Computing, vol. 15, no. 1, pp. 147–154, Jan. 2015.

  9. A. K. Kwan, M. Younes, F. M. Ghannouchi, S. Zhang, W. Chen, R. Darraji, M. Helaoui, and O. Hammi, “Concurrent multi-band envelope modulated power amplifier linearized using extended phase-aligned DPD,” IEEE Trans. Microw. Theory Tech., vol. 62, no. 12, pp. 3298–3308, Dec. 2014.

  10. O. Hammi, A. Kwan, S. Bensmida, K. A. Morris, and F. M. Ghannouchi, “A digital predistortion system with extended correction bandwidth with application to LTE-A nonlinear power amplifiers,” IEEE Trans. Circuits Syst. I, Reg. Papers, vol. 61, no. 12, pp. 3487–3495, Dec. 2014.

  11. A. H. Abdelhafiz, A. Zerguine, O. Hammi, and F. M. Ghannouchi, “A lattice-based memory polynomial predistorter for wideband RF power amplifiers,” IET Commun., vol. 8, no. 17, pp. 3122–3127, Nov. 2014.

  12. A. H. Abdelhafiz, A. Kwan, O. Hammi, and F. M. Ghannouchi, “Digital predistortion of LTE-A power amplifiers using compressed sampling based unstructured pruning of Volterra series,” IEEE Trans. Microw. Theory Tech., vol. 62, no. 11, pp. 2583–2593, Nov. 2014.

  13. O. Hammi, “Asymmetry index for memory effects quantification in wireless transmitters and power amplifiers driven by broadband modulated signals,” Springer The Arabian Journal for Science and Engineering, vol. 39, no. 5, pp. 4013–4021, Apr. 2014.

  14. D. S. Owodunni, A. Ali, A. A. Quadeer, E. B. Al-Safadi, O. Hammi, and T. Y. Al-Naffouri, “Compressed sensing techniques for receiver based post-compensation of transmitter’s nonlinear distortions in OFDM systems,” Elsevier Signal Processing Journal, vol. 97, pp. 282–293, Apr. 2014.

  15. O. Hammi, “Augmented twin-nonlinear two-box behavioral models for multi-carrier LTE power amplifier,” Hindawi The Scientific World Journal - Subject Area: Communications, vol. 2014, Article ID 762534, 7 pages, 2014. doi:10.1155/2014/762534.

  16. A. Ali, O. Hammi, and T. Y. Al-Naffouri, “Compressed sensing based joint-compensation of power amplifier's distortions in OFDMA cognitive radio systems,” IEEE Journal on Emerging and Selected Topics in Circuits and Systems (IEEE JETCAS) Special Issue on "Advanced Circuits and Systems for CR/SDR Applications", vol. 3, no. 4, pp. 508–520, Dec. 2013.

  17. A. H. Abdelhafiz, O. Hammi, A. Zerguine, A. T. Al-Awami, and F. M. Ghannouchi, “A PSO based memory polynomial predistorter with embedded dimension estimation,” IEEE Trans. Broadcast., vol. 59, no. 4, pp. 665–673, Dec. 2013.

  18. O. Hammi, A. Kwan, and F. M. Ghannouchi, “Bandwidth and power scalable digital predistorter for RF power amplifiers,” IEEE Trans. Broadcast., vol. 59, no. 3, pp. 520–527, Sep. 2013.

  19. A. Kwan, F. M. Ghannouchi, O. Hammi, M. Helaoui, and M. R. Smith, “Look-up table-based digital predistorter implementation for field programmable gate arrays using long-term evolution signals with 60MHz bandwidths,” IET Science Measurements & Technology, vol. 6, no. 3, pp. 181–188, May 2012.

  20. R. Darraji, F. M. Ghannouchi, and O. Hammi, “Generic load-pull based design methodology for performance optimization of energy-efficient Doherty amplifiers,” IET Science Measurements & Technology, vol. 6, no. 3, pp. 132–138, May 2012.

  21. F. M. Ghannouchi, F. Taringou, A. Kwan, O. Hammi, and R. Malhame, “Identification of true-static predistorter using a sine wave and accurate quantification of memory effects in broadband wireless transmitters,” IET Communications, vol. 5, no. 9, pp. 1268–1274, Jul. 2011.

  22. R. Darraji, F. M. Ghannouchi, and O. Hammi, “A dual-input digitally driven Doherty amplifier architecture for performance enhancement of Doherty transmitters,” IEEE Trans. Microw. Theory Tech., vol. 59, no. 5, pp. 1284–1293, May. 2011.

  23. M. Younes, O. Hammi, A. Kwan, and F. M. Ghannouchi, “An accurate complexity-reduced “PLUME” model for behavioral modeling and digital predistortion of RF power amplifiers,” IEEE Trans. Ind. Electron., vol. 58, no. 4, pp. 1397–1405, Apr. 2011.

  24. S. Saied-Bouajina, O. Hammi, M. Jaidane-Saidane, and F. M. Ghannouchi, “Experimental approach for robust identification of RF power amplifier behavioral models using polynomial structures,” IET Microwaves, Antennas and Propagation, vol. 4, no. 11, pp. 1818–1828, Nov. 2010.

  25. O. Hammi, M. Younes, and F. M. Ghannouchi, “Metrics and methods for benchmarking of RF transmitter behavioral models with application to the development of a novel hybrid memory polynomial model,” IEEE Trans. Broadcast., vol. 56, no. 3, pp. 350–357, Sep. 2010.

  26. F. Taringou, O. Hammi, B. Srinivasan, R. Malhame, and F. M. Ghannouchi, “Behavior modelling of wideband RF transmitters using Hammerstein-Wiener models,” IET Circuits, Devices and Systems, vol. 4, no. 4, pp. 282–290, Jul. 2010.

  27. N. Boulejfen, A. Harguem, O. Hammi, F. M. Ghannouchi, and A. Gharsallah, “Analytical prediction of spectral regrowth and correlated and uncorrelated distortion in multicarrier wireless transmitters exhibiting memory effects,” IET Microwaves, Antennas and Propagation, vol. 4, no. 6, pp. 685–696, Jun. 2010.

  28. O. Hammi, M. Younes, A. Kwan, M. Smith, and F. M. Ghannouchi, “Performance-driven dimension estimation of memory polynomial behavioral models for wireless transmitters and power amplifiers,” Journal of Progress In Electromagnetics Research (PIER) C, vol. 12, pp. 173–189, 2010.

  29. F. M. Ghannouchi and O. Hammi, “Behavioral modeling and predistortion,” IEEE Microw. Mag., vol. 10, no. 7, pp. 52–64, Dec. 2009.

  30. S. C. Jung, O. Hammi, and F. M. Ghannouchi, “Design optimization and DPD linearization of GaN based unsymmetrical Doherty power amplifiers for 3G multi-carrier applications,” IEEE Trans. Microw. Theory Tech., Vol. 57, no. 9, pp. 2105–2113, Sep. 2009.

  31. O. Hammi and F. M. Ghannouchi, “Twin nonlinear two-box models for power amplifiers and transmitters exhibiting memory effects with application to digital predistortion,” IEEE Microw. Wireless Compon. Lett., Vol. 19, no. 8, pp. 530–532, Aug. 2009.

  32. M. Younes, O. Hammi, and F. M. Ghannouchi, “Algorithm for model dimension estimation of memory polynomial-based RF transmitters / power amplifiers behavioral models,” International Journal of Microwave and Optical Technology, vol. 4, no. 4, pp. 242–247, Jul. 2009.

  33. O. Hammi and F. M. Ghannouchi, “Power alignment of digital predistorters for power amplifiers linearity optimization,” IEEE Trans. Broadcast., vol. 55, no. 1, pp. 109–114, Mar. 2009.

  34. O. Hammi, S. Carichner, B. Vassilakis, and F. M. Ghannouchi, “Power amplifiers’ model assessment and memory effects intensity quantification using memoryless post-compensation technique,” IEEE Trans. Microw. Theory Tech., vol. 56, no. 12, part: 2, pp. 3170–3179, Dec. 2008.

  35. O. Hammi, S. Carichner, B. Vassilakis, and F. M. Ghannouchi, “Synergetic crest factor reduction and baseband digital predistortion for adaptive 3G Doherty power amplifier linearizer design,” IEEE Trans. Microw. Theory Tech., vol. 56, no. 11, part: 2, pp. 2602–2608, Nov. 2008.

  36. O. Hammi, F. M. Ghannouchi, and B. Vassilakis, “A compact envelope-memory polynomial for RF transmitters modeling with application to baseband and RF-digital predistortion,” IEEE Microw. Wireless Compon. Lett., vol. 18, no. 5, pp. 359–361, May. 2008.

  37. O. Hammi, F. M. Ghannouchi and B. Vassilakis, “On the sensitivity of RF transmitters’ memory polynomial model identification to delay alignment resolution,” IEEE Microw. Wireless Compon. Lett., vol. 18, no. 4, pp. 263–265, Apr. 2008.

  38. S. Boumaiza, M. Helaoui, O. Hammi, T. Liu, and F. M. Ghannouchi, “Systematic and adaptive characterization approach for behavior modeling of dynamic nonlinear transmitters,” IEEE Trans. Instrum. Meas., vol. 56, no. 6, pp. 2203–2211, Dec. 2007.

  39. O. Hammi, F. M. Ghannouchi, S. Boumaiza, and B. Vassilakis, “A data-based nested LUT model for RF power amplifiers exhibiting memory effects,” IEEE Microw. Wireless Compon. Lett., vol. 17, no. 10, pp. 712–714, Oct. 2007.

  40. O. Hammi, S. Boumaiza and F. M. Ghannouchi, “On the robustness of digital predistortion function synthesis and average power tracking for highly nonlinear power amplifiers,” IEEE Trans. Microw. Theory Tech., vol. 55, no. 6, part: 2, pp. 1382–1389, Jun. 2007.

  41. O. Hammi, J. Sirois, S. Boumaiza, and F. M. Ghannouchi, “Design and performance analysis of mismatched Doherty amplifiers using accurate load-pull based model,” IEEE Trans. Microw. Theory Tech., vol. 54, no. 8, pp. 3246–3254, Aug. 2006.

  42. O. Hammi, S. Boumaiza, M. Jaidane and F. M. Ghannouchi, “Digital subband filtering predistorter architecture for wireless transmitters,” IEEE Trans. Microw. Theory Tech., vol. 53, no. 5, pp. 1643–1652, May 2005.
     

 
Conference Papers
  1. A. K. Kwan, M. Younes, O. Hammi, A. Abdelhafiz, F. M. Ghannouchi, and A. O. Fapojuwo, “A multi-stage concurrent dual-band DPD architecture for closely spaced carriers using a low bandwidth feedback loop,” IEEE International Microwave Symposium (IMS2016), San Francisco, CA, 22-27 May 2016. (accepted)

  2. O. Hammi, A. E. Abdelrahman, and A. Zerguine, “Multi-basis weighted memory polynomial for RF power amplifiers behavioral modeling,” IEEE International Wireless Symposium (IWS2016), Shanghai, China, 14 - 16 Mar. 2016. (accepted)

  3. O. Hammi, A. Abdelhafiz, T. Y. Al-Naffouri, and F. M. Ghannouchi, “On the use of compressed sampling algorithms for impairments compensation in dynamic nonlinear transmitters,” 15th IEEE International Symposium on Signal Processing on Signal Processing and Information Technology (ISSPIT 2015), Abu Dhabi, United Arab Emirates, pp. 614618, 7-10 December 2015.

  4. S. Najmeddine, and O. Hammi, “Novel single-input single-output two-box polar behavioral model for envelope tracking power amplifiers,” 2015 IEEE AP-S Symposium on Antennas and Propagation (APS 2015), Vancouver, BC, Canada, pp. 8889, 19-25 Jul. 2015.

  5. A. Alreshaid, O. Hammi, M. S. Sharawi, and K. Sarabandi, “A millimeter wave switched beam planar antenna array,” 2015 IEEE AP-S Symposium on Antennas and Propagation (APS 2015), Vancouver, BC, Canada, pp. 8889, 19-25 Jul. 2015.

  6. M. Hussain, O. Hammi, M. S. Sharawi, S. Podilchak, and Y. Antar, “A dielectric resonator based millimeter-wave MIMO antenna array for hand-held devices,” 2015 IEEE AP-S Symposium on Antennas and Propagation (APS 2015), Vancouver, BC, Canada, pp. 34, 19-25 Jul. 2015.

  7. A. Alreshaid, O. Hammi, M. S. Sharawi, and K. Sarabandi, “'A compact millimeter wave slot antenna array for 5G standards,” 2015 4th Asia-Pacific Conference on Antennas and Propagation (APCAP 2015), Bali Island, Indonesia, pp. 8889, 30 Jun. - 3 Jul. 2015.

  8. M. Hanzala, M. S. Sharawi, and O. Hammi, “Accurate estimation of memory polynomial model dimension for dynamic nonlinear RF power amplifiers,” 10th IEEE Conference on Industrial Electronics and Applications (ICIEA2015), Auckland, New Zealand, pp. 145150, 15-17 Jun. 2015.

  9. A. Abdelhafiz, O. Hammi, and F. M. Ghannouchi “A lattice-based memory polynomial behavioral model for nonlinear MIMO transmitters using fixed point arithmetic,” IEEE International Microwave Symposium (IMS2015), Phoenix, AZ, pp. 1–4, 17-22 May 2015.

  10. S. K. Dhar, O. Hammi, M. S. Sharawi, and F. M. Ghannouchi, “Power amplifier based integrated and miniaturized active antenna,” 9th European Conference on Antennas and Propagation (EuCAP 2015), Lisbon, Portugal, pp. 1–4, 12-17 Apr. 2015.

  11. M. O. H. Khalifa, A. Abdelhafiz, A. Kwan, F. M. Ghannouchi, and O. Hammi, “Behavioral modeling of envelope tracking power amplifier using Volterra series model and compressed sampling,” IEEE International Wireless Symposium (IWS2015), Shenzhen, China, pp. 1–4, 30 Mar.-1 Apr. 2015.

  12. A. Abdelhafiz, M. Younes, A. Kwan, O. Hammi, F. M. Ghannouchi, and N. Boulejfen, “A comparative study of wideband and dual-band digital predistortion architectures,” IEEE International Wireless Symposium (IWS2015), Shenzhen, China, pp. 1–4, 30 Mar.-1 Apr. 2015.

  13. A. Zerguine, O. Hammi, A. H. Abdelhafiz, and F. M. Ghannouchi, "A predistorter based on the least-mean squares Newton algorithm," 2014 International Symposium on Nonlinear Theory and Its Applications (NOLTA 14), Luzern, Switzerland, pp. 660–663, 14-18 Sep. 2014.

  14. A. Zerguine, O. Hammi, A. H. Abdelhafiz, M. Helaoui, and F. M. Ghannouchi, "Behavioral modeling and predistortion of nonlinear power amplifiers based on adaptive filtering techniques," 11th IEEE International Multi-Conference on Systems, Signals, and Devices (SSD 14), Barcelona, Spain, pp. 1–5, 11-14 Feb. 2014.

  15. O. Hammi, S. Bensmida, and K. Morris, “Behavioral modeling of class J amplifier driven by 100MHz LTE-advanced signal using dynamic nonlinearity reduction,” IEEE Topical Meeting on Power Amplifiers for Wireless and Radio Applications (PAWR 2014), New Port Beach, CA, pp. 67–69, 19-22 Jan. 2014.

  16. A. M. Kedir A. Kwan, O. Hammi, and F. M. Ghannouchi, “Generic bandwidth scalable behavioral models for RF power amplifiers with memory effects,” 2013 IEEE International RF and Microwave Conference (RFM 2013), Penang, Malaysia, pp. 291–294, 9-11 December 2013.

  17. O. Hammi, “Quantification of power amplifiers' static and dynamic distortions using frequency domain metrics,” 2013 IEEE International RF and Microwave Conference (RFM 2013), Penang, Malaysia, pp. 287–290, 9-11 December 2013.

  18. O. Hammi, “Low complexity behavioral model for RF power amplifiers' nonlinearity and efficiency prediction,” 2013 IEEE International RF and Microwave Conference (RFM 2013), Penang, Malaysia, pp. 283–286, 9-11 December 2013.

  19. O. Hammi, M. S. Sharawi, and F. M. Ghannouchi, “Generalized twin-nonlinear two-box digital predistorter for GaN based LTE Doherty power amplifiers with strong memory effects,” IEEE International Wireless Symposium (IWS2013), Beijing, China, pp. 14, 14-18 April 2013.

  20. A. B. Numan, O. Hammi, M. S. Sharawi, and D. N. Aloi, “A printed MIMO antenna system with CLLs for isolation enhancement,” 7th European Conference on Antennas and Propagation (EUCAP 2013), Gothenburg, Sweden, pp. 19401943, 8-12 April 2013.

  21. S. Deif, O. Hammi, M. S. Sharawi, and D. N. Aloi, “A Compact Size 12-Port Combiner/Splitter,” IEEE Wireless and Microwave Technology Conference (WAMICON 2013), Orlando, FL, USA, pp. 13, 7-9 April 2013.

  22. A. Ibrahim, A. Zerguine and O. Hammi, “Weighted memory polynomial model for RF power amplifiers behavioral modeling,” 4th Saudi Students Scientific Conference, Makkah, Saudi Arabia, April 2013.

  23. A. Ali, O. Hammi, and T. Y. Al-Naffouri, “Compressed sensing based schemes to mitigate nonlinear distortions in WiMAX physical layer,” 4th Saudi Students Scientific Conference, Makkah, Saudi Arabia, April 2013.

  24. O. Hammi, S. C. Jung, and F. M. Ghannouchi, “Design for linearizability of GaN based multi-carrier Doherty power amplifier through bias optimization,” 19th IEEE International Conference on Electronics, Circuits, and Systems (ICECS2012), Seville, Spain, December 2012, pp. 492-495.

  25. O. Hammi, A. M. Kedir, and F. M. Ghannouchi, “Nonuniform memory polynomial behavioral model for wireless transmitters and power amplifiers,” 2012 IEEE Asia-Pacific Microwave Conference (APMC2012), Kaohsiung, Taiwan, December 2012, pp. 836-838.

  26. A. H. AbdelHafiz, O. Hammi, and A. Zerguine, “Efficient adaptive identification of nonlinear power amplifiers using twin-nonlinear two-box model,” IEEE VTS Asia-Pacific Wireless Communications Symposium (APWCS 2012), Kyoto, Japan, Aug. 2012, (accepted).

  27. A. Al-Mansour, R. Al-Safaria, O. Hammi, and M. S. Sharawi, “Programmable portable RF wireless power meter,” 3rd Saudi Students Scientific Conference, Al-Khobar, Saudi Arabia, May 2012.

  28. O. Hammi, “Enhanced delay alignment method for behavioral modeling of power amplifiers exhibiting memory effects,” 16th IEEE Mediterranean Electrotechnical Conference (MELECON2012), Yasmine Hammamet, Tunisia, Mar. 2012, pp. 404-407.

  29. O. Hammi, “Orthogonal polynomial based Hammerstein behavioral model for power amplifiers with strong memory effects,” 2010 IEEE Asia-Pacific Microwave Conference (APMC2010), Yokohama, Japan, Dec. 2010, pp. 441-444.

  30. O. Hammi, A. Kwan, M. Helaoui, and F. M. Ghannouchi, “Green power amplification systems for 3G+ wireless communication infrastructure,” 2010 IEEE 72nd Vehicular Technology Conference (VTC2010-Fall), Ottawa, Canada, Sep. 2010, pp. 1-5.

  31. F. M. Ghannouchi, F. Taringou, and O. Hammi, “A dual branch Hammerstein-Wiener architecture for behavior modeling of wideband RF transmitters,” 2010 IEEE MTT-S International Microwave Symposium (IMS’2010), Anaheim, CA, USA, May 2010, pp. 1692-1695.

  32. A. Kwan, O. Hammi, M. Helaoui, and F. M. Ghannouchi, “High performance wideband digital predistortion platform for 3G+ applications with better than 55dBc over 40 MHz bandwidth,” 2010 IEEE MTT-S International Microwave Symposium (IMS’2010), Anaheim, CA, USA, May 2010, pp. 1082-1085.

  33. O. Hammi and F. M. Ghannouchi, “Comparative study of recent advances in power amplification devices and circuits for wireless communication infrastructure,” 16th IEEE International Conference on Electronics, Circuits, and Systems (ICECS’2009), Yasmine Hammamet, Tunisia, December 2009, pp. 379-382.

  34. S. A. Bassam, M. M. Ebrahimi, A. Kwan, M. Helaoui, M. P. Aflaki, O. Hammi, M. Fattouche, and F. M. Ghannouchi, “A generic architecture for smart multi-standard software defined radio systems,” SDR’09 Technical Conference and Product Exposition, Washington, DC, USA, December 2009, on CDROM.

  35. O. Hammi, S. Carichner, B. Vassilakis, and F. M. Ghannouchi, “Effects of crest factor reduction on the predistortion performance for multi-carrier 3G RF power amplifiers,” 2009 IEEE MTT-S International Microwave Symposium (IMS’2009), Boston, MA, USA, June 2009, pp. 1085-1088.

  36. O. Hammi and F. M. Ghannouchi, “Efficiency optimization of WCDMA driven two-way Doherty power amplifiers over wide power range,” 2009 IEEE Canadian Conference on Electrical and Computer Engineering (CCECE’2009), St. John’s, NF, Canada, May 2009, pp. 1217-1220.

  37. K. Rawat, O. Hammi, and F. M. Ghannouchi, “Investigating effect of quadrature imperfection of vector multiplier in implementing RF/Digital predistortion,” 2009 IEEE Wireless and Microwave Technology Conference (WAMICON 2009), Clearwater, FL, USA, April 2009, on CDROM.

  38. O. Hammi, M. Younes, B. Vassilakis, and F. M. Ghannouchi, “Digital predistorters sensitivity to delay alignment resolution,” 2009 IEEE Radio and Wireless Symposium (RWS 2009), San Diego, CA, USA, January 2009, pp. 606-609.

  39. O. Hammi, S. Carichner, B. Vassilakis, and F. M. Ghannouchi, “On the predistortability of high efficiency multi-carrier power amplifiers for wireless communication infrastructure,” IEEE Topical Symposium on Power Amplifiers for Wireless Communications, San Diego, CA, USA, January 2009.

  40. J. Li, O. Hammi, and F. M. Ghannouchi, Implementation of dual-channel receiver suitable for 3G power amplifiers characterization in RF/digital predistortion systems, IEEE International Conference on Electronics, Circuits and Systems, Malta, August 2008, pp. 169-172.

  41. O. Hammi, S. Carichner, B. Vassilakis, and F. M. Ghannouchi, “Novel approach for static nonlinear behavior identification in RF power amplifiers exhibiting memory effects,” 2008 IEEE MTT-S International Microwave Symposium (IMS’2008), Atlanta, GA, USA, June 2008, pp. 1521-1524.

  42. T. Liu, Y. Ye, S. Boumaiza, M. Helaoui, O. Hammi, and F. M. Ghannouchi, “Accurate identification of static nonlinear properties of wideband RF power amplifiers”, 6th International Conference on Microwave and Millimeter Wave Technology, Nanjing, China, April 2008, pp. 1351-1354.

  43. O. Hammi, F. M. Ghannouchi, and B. Vassilakis, “2-D vector quantized behavioral model for wireless transmitters’ nonlinearity and memory effects modeling,” 2008 IEEE Radio and Wireless Symposium (RWS 2008), Orlando, FL, USA, January 2008, pp. 763-766.

  44. S. Bensmida, O. Hammi, and F. M. Ghannouchi, “High efficiency digitally linearized GaN based power amplifier for 3G applications,” 2008 IEEE Radio and Wireless Symposium (RWS 2008), Orlando, FL, USA, January 2008, pp. 751-754.

  45. T. Ying, O. Hammi, S. Boumaiza, and F. M. Ghannouchi, “Design and optimization of digital signal component separator of LINC transmitters using FPGA processors,” 2007 IEEE International Conference on Signal Processing and Communications (ICSPC 2007), Dubai, UAE, November 2007, pp. 836-839.

  46. O. Hammi, S. Boumaiza, B. Vassilakis, and F. M. Ghannouchi, “On the effects of the average power of training sequences used to synthesize memory digital predistorters in WCDMA transmitters,” 37th IEEE European Microwave Conference (EuMC2007), Munich, Germany, October 2007, pp. 174-177.

  47. O. Hammi, S. Boumaiza, B. Vassilakis, and F. M. Ghannouchi, “Digital predistorter architecture with small signal gain control for highly nonlinear RF power amplifiers,” 50th IEEE International Midwest Symposium on Circuits & Systems (MWSCAS2007), Montreal, Qc, Canada, August 2007, pp. 1201-1204.

  48. N. Messaoudi, O. Hammi, S. Boumaiza, and F. M. Ghannouchi, “A comparative study of power amplifier’s sensitivity to mismatched load: single branch vs. Doherty architectures”, IEEE Canadian Conference on Electrical and Computer Engineering, Vancouver, BC, Canada, April 2007, on CDROM.

  49. O. Hammi, S. Boumaiza, and F. M. Ghannouchi, “Multi-branch polynomial model of RF power amplifiers with embedded average power dependency”, IEEE Canadian Conference on Electrical and Computer Engineering, Vancouver, BC, Canada, April 2007, on CDROM.

  50. O. Hammi, S. Boumaiza, and F. M. Ghannouchi, “Study of the output load mismatch effects on the load modulation of Doherty power amplifiers”, IEEE Radio Wireless Symposium (RWS 2007), Long Beach, CA, USA, January 2007, pp. 393 - 394a.

  51. O. Hammi, S. Boumaiza, and F. M. Ghannouchi, “On the robustness of the predistortion function synthesis for highly nonlinear RF power amplifiers linearization,” IEEE European Microwave Conference (EuMC2006), Manchester, UK, September 2006, pp. 145-148.

  52. O. Hammi, S. Boumaiza, J. Kim, S. Hong, I. Kim, B. Kim, and F. M. Ghannouchi, “RF power amplifiers for emerging wireless communications: single branch vs. multi-branch architectures”, IEEE Canadian Conference on Electrical and Computer Engineering, Ottawa, ON, Canada, 7-10 May 2006, pp. 1469 - 1472.

  53. O. Hammi and F. Ghannouchi, “Temperature compensated digital predistorter for 3G power amplifiers, IEEE International Conference on Electronics, Circuits and Systems (ICECS’2005), Carthage, Tunisia, December 2005.

  54. O. Hammi, S. Bousnina, and F. M. Ghannouchi, “A linearized Doherty amplifier using complex baseband digital predistortion driven by CDMA signals”, IEEE Radio and Wireless Conference (RAWCON’2004), Atlanta, GA, USA, 19-22 September 2004, Conference Proceedings, pp. 435-438.

  55. O. Hammi, S. Boumaiza, M. Jaidane, and F. M. Ghannouchi, “Baseband digital predistortion using subband filtering technique”, IEEE MTT-S International Microwave Symposium (IMS’2003), Philadelphia, PA, USA, 8-13 June 2003, Symposium Digest, Vol. 3, pp. 1699-1702.

  56. O. Hammi, S. Boumaiza, M. Jaidane-Saidane, and F. M. Ghannouchi, “Adaptive baseband digital predistorter suitable for wideband signals”, 14th International Conference on Microelectronics (ICM’2002), Beirut, Lebanon, 11-13 December 2002, Conference Proceedings, pp. 131-134.

  57. O. Hammi, M. Jaidane-Saidane, S. Boumaiza, and F. M. Ghannouchi, “Subband digital predistorter for 3G applications”, 8th International Symposium of Microwave & Optical Technology (ISMOT’2001), Montreal, Qc, Canada 19-23 June 2001, Symposium Digest, pp. 199-202.

 
 

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