Indexed Journal
2014
1. Mokayef,M.,Rahman,T.A,Ngah, R., Ahmed,M.Y, "Spectrum sharing between high altitude platform system ", Advanced Science Letters, 20 (2),pp. 451-454, 2014.
2. Mastaneh mokayef, Tharek Abd. Rahman, Razali Ngah, “Early Stage of Spectrum Planning for Operation of HAPS at 5.8GHz Band”, Life Science Journal, Special Issue 2014.
3. Bushra Naeem, Razali Ngah, Siti Zaiton Mohd Hashim , Wajahat Maqbool, Muhaddisa Barat Ali,“A Neural Network Based Approach for Call Admission Control in Heterogeneous Networks”. Life Science Journal 2014.
4.Yasser Zahedi, Razali Ngah, Mastaneh Mokayef “MIMO Correlation-Based Analytical Channel Modeling”, Life Science Journal, Special Issue 2014.
2013
1. Nunoo, S., Chude-Okonkwo, U. A. K., Ngah, R. and Chude-Olisah, C. UWB Channel Measurement and Time Dispersion Analysis for Infostation Application in Outdoor Roadway and Recreation Park. Jökull Journal, 2013. 63(8): 307-322. ISSN: 0449-0576 ISI, IF:1.0
2. Nael A. Al-Sharee, Syed I. S. Hassan, Fareq Malek, Razali Ngah, Syed A. Aljunid, Rashid A. Fayadh, Jaafar A. ALdhaibani, and Hasliza A. Rahim, "Development of a New Approach for High-Quality Quadrupling Frequency Optical Millimeter-wave Signal Generation Without Optical Filter", Progress In Electromagnetics Research (PIERS),Vol. 134, page 189-208, 2013. ISSN : 1559-8985 ISI,IF :5.298
3. Nael A. Shareefi, Syed I.S. Hassan, Fareq Malek, Razali Ngah, Sura A.Abbas, Syed A.Aljunid, “ A Cost-Effective Method for High-Quality 60GHz Optical Milimeter Wave Signal Generation Based on Frequency Quadraupling “, Progress In Electromagenetics Research, Vol 137, 225-274, 2013. ISSN :1559-8985 ISI,IF :5.298
2012
1. Uche Chude A.K Okonkwo, Razali Ngah , Chee Y. Leow, and Tharek Abd Rahman, " Time Scale Domain Characterization of Time Varying Ultrawideband Infostation Channel", Radioengineering Journal , VOL. 21, NO. 2, June 2012, pp. 694-703 (IF: 0.503)
2. Ng, W. P., Abd El Aziz, A., Ghassemlooy, Z., Aly, M., and Ngah, R., ‘Optimised Non-uniform Biasing Technique for High Speed Optical Router to Achieve Uniform SOA Gain’, IET Communications Journal, 6(8), pp 484-491, 2012 (IF: 0.829).
3. Reza Firsandaya Malik, Tharek Abdul Rahman, Razali Ngah and Siti Zaiton Mohd Hashim, Siti Zaiton," The New Multipoint Relays Selection in OLSR using Particle Swarm Optimization", TELKOMNIKA, Indonesian Journal of Electrical Engineering Vol.10, No. 2,Jun 2012, pp. 343-352. (Ei Compendex)
4. N.I. Dzulkipli, M. H. Jamaluddin, R. Ngah, M. R. Kamarudin, N. Seman and M. K. A. Rahim," Mutual Coupling Analysis Using FDTD for Dielectric Resonator Antenna Reflectarray Radiation Prediction" Progress In Electromagnetics Research B, Vol. 41, 121-136, 2012.
2011
1. T. Prakoso, R. Ngah, Z. Ghassemlooy, and T. A. Rahman, “Antenna representation in two-port network scattering parameter,” Microwave and Optical Technology Letters, vol. 53, no. 6, pp. 1404-1409, 2011.( IF : 0.682)
2. Uche Chude A.K Okonkwo, Razali Ngah and Tharek Abdul Rahman , " Time Scale Domain Characterization of Non- WSSUS Wideband Channels", EURASIP Journal on Advances in Signal Processing, 2011 (IF : 1.053 )
2009
1. Uche A.K Okonkwo, Razali Ngah, and Tharek A. Rahman," Affine Group Linear Operator-based Channel Characterization for Mobile Radio Systems", World Scientific and Engineering Academic Society (WSEAS) Transactions on System Journal, Issue 2, Vol. 8, Feb. 2009, pp. 288 – 301. (ISSN: 1109-2777).
2. Uche A.K Okonkwo, Razali Ngah, Zabih Ghassemlooy and Tharek A. Rahman, “Joint Time-Scale Channel Characterization for Mobile Radio Systems”, Submitted to EURASIP Journal on Advances in Signal Processing, Oct. 2009.
3. Uche A.K Okonkwo, Razali Ngah, Zabih Ghassemlooy and Tharek A. Rahman, “Stochastic Time-scale Mobile Radio Channel Characterization”, Submitted to IEEE Transaction on Vehicular Technology, Sept. 2009.
2008
1. Razali Ngah, Teguh Prakoso, and Tharek Abdul Rahman, “Coverage Range and Cost Comparison of Remote Antenna Unit Designs for In-building Radio over Fiber Technology” ITB J. ICT Vol. 2, No. 1, 2008, pp 24-41.
2007
1. Firsandaya Malik, Reza., Abdul Rahman, Tharek., Mohd Hashim, Siti Zaiton and Ngah, Razali., “New Particle Swarm Optimizer with Sigmoid Increasing Inertia Weight”, August 2007, The International Journal of Computer Science and Security (IJCSS). (ISSN: 1985-1533)
2005
1. Z. Ghassemlooy, and R. Ngah, “Simulation of 1X2 OTDM Router Employing Symmetric Mach-Zehnder Switches” IEE Proceeding Circuits, Devices & Systems, vol. 152, Issue 2, 8 April 2005, pp. 171-177.
2014
1. Mokayef,M.,Rahman,T.A,Ngah, R., Ahmed,M.Y, "Spectrum sharing between high altitude platform system ", Advanced Science Letters, 20 (2),pp. 451-454, 2014.
2. Mastaneh mokayef, Tharek Abd. Rahman, Razali Ngah, “Early Stage of Spectrum Planning for Operation of HAPS at 5.8GHz Band”, Life Science Journal, Special Issue 2014.
3. Bushra Naeem, Razali Ngah, Siti Zaiton Mohd Hashim , Wajahat Maqbool, Muhaddisa Barat Ali,“A Neural Network Based Approach for Call Admission Control in Heterogeneous Networks”. Life Science Journal 2014.
4.Yasser Zahedi, Razali Ngah, Mastaneh Mokayef “MIMO Correlation-Based Analytical Channel Modeling”, Life Science Journal, Special Issue 2014.
2013
1. Nunoo, S., Chude-Okonkwo, U. A. K., Ngah, R. and Chude-Olisah, C. UWB Channel Measurement and Time Dispersion Analysis for Infostation Application in Outdoor Roadway and Recreation Park. Jökull Journal, 2013. 63(8): 307-322. ISSN: 0449-0576 ISI, IF:1.0
2. Nael A. Al-Sharee, Syed I. S. Hassan, Fareq Malek, Razali Ngah, Syed A. Aljunid, Rashid A. Fayadh, Jaafar A. ALdhaibani, and Hasliza A. Rahim, "Development of a New Approach for High-Quality Quadrupling Frequency Optical Millimeter-wave Signal Generation Without Optical Filter", Progress In Electromagnetics Research (PIERS),Vol. 134, page 189-208, 2013. ISSN : 1559-8985 ISI,IF :5.298
3. Nael A. Shareefi, Syed I.S. Hassan, Fareq Malek, Razali Ngah, Sura A.Abbas, Syed A.Aljunid, “ A Cost-Effective Method for High-Quality 60GHz Optical Milimeter Wave Signal Generation Based on Frequency Quadraupling “, Progress In Electromagenetics Research, Vol 137, 225-274, 2013. ISSN :1559-8985 ISI,IF :5.298
2012
1. Uche Chude A.K Okonkwo, Razali Ngah , Chee Y. Leow, and Tharek Abd Rahman, " Time Scale Domain Characterization of Time Varying Ultrawideband Infostation Channel", Radioengineering Journal , VOL. 21, NO. 2, June 2012, pp. 694-703 (IF: 0.503)
2. Ng, W. P., Abd El Aziz, A., Ghassemlooy, Z., Aly, M., and Ngah, R., ‘Optimised Non-uniform Biasing Technique for High Speed Optical Router to Achieve Uniform SOA Gain’, IET Communications Journal, 6(8), pp 484-491, 2012 (IF: 0.829).
3. Reza Firsandaya Malik, Tharek Abdul Rahman, Razali Ngah and Siti Zaiton Mohd Hashim, Siti Zaiton," The New Multipoint Relays Selection in OLSR using Particle Swarm Optimization", TELKOMNIKA, Indonesian Journal of Electrical Engineering Vol.10, No. 2,Jun 2012, pp. 343-352. (Ei Compendex)
4. N.I. Dzulkipli, M. H. Jamaluddin, R. Ngah, M. R. Kamarudin, N. Seman and M. K. A. Rahim," Mutual Coupling Analysis Using FDTD for Dielectric Resonator Antenna Reflectarray Radiation Prediction" Progress In Electromagnetics Research B, Vol. 41, 121-136, 2012.
2011
1. T. Prakoso, R. Ngah, Z. Ghassemlooy, and T. A. Rahman, “Antenna representation in two-port network scattering parameter,” Microwave and Optical Technology Letters, vol. 53, no. 6, pp. 1404-1409, 2011.( IF : 0.682)
2. Uche Chude A.K Okonkwo, Razali Ngah and Tharek Abdul Rahman , " Time Scale Domain Characterization of Non- WSSUS Wideband Channels", EURASIP Journal on Advances in Signal Processing, 2011 (IF : 1.053 )
2009
1. Uche A.K Okonkwo, Razali Ngah, and Tharek A. Rahman," Affine Group Linear Operator-based Channel Characterization for Mobile Radio Systems", World Scientific and Engineering Academic Society (WSEAS) Transactions on System Journal, Issue 2, Vol. 8, Feb. 2009, pp. 288 – 301. (ISSN: 1109-2777).
2. Uche A.K Okonkwo, Razali Ngah, Zabih Ghassemlooy and Tharek A. Rahman, “Joint Time-Scale Channel Characterization for Mobile Radio Systems”, Submitted to EURASIP Journal on Advances in Signal Processing, Oct. 2009.
3. Uche A.K Okonkwo, Razali Ngah, Zabih Ghassemlooy and Tharek A. Rahman, “Stochastic Time-scale Mobile Radio Channel Characterization”, Submitted to IEEE Transaction on Vehicular Technology, Sept. 2009.
2008
1. Razali Ngah, Teguh Prakoso, and Tharek Abdul Rahman, “Coverage Range and Cost Comparison of Remote Antenna Unit Designs for In-building Radio over Fiber Technology” ITB J. ICT Vol. 2, No. 1, 2008, pp 24-41.
2007
1. Firsandaya Malik, Reza., Abdul Rahman, Tharek., Mohd Hashim, Siti Zaiton and Ngah, Razali., “New Particle Swarm Optimizer with Sigmoid Increasing Inertia Weight”, August 2007, The International Journal of Computer Science and Security (IJCSS). (ISSN: 1985-1533)
2005
1. Z. Ghassemlooy, and R. Ngah, “Simulation of 1X2 OTDM Router Employing Symmetric Mach-Zehnder Switches” IEE Proceeding Circuits, Devices & Systems, vol. 152, Issue 2, 8 April 2005, pp. 171-177.
Non Indexed Journal
2013
1. Bushra Naeem, Abel Nyamapfene, U.A.K. Chude Okonkwo, and Razali Ngah, A Software Radio Design Approach for Heterogeneous Wireless Access Protocol Transceivers, The Pacific Journal of Science and Technology, vol.14.Issue 1, May 2013 pp 216 – 222
2013
1. Bushra Naeem, Abel Nyamapfene, U.A.K. Chude Okonkwo, and Razali Ngah, A Software Radio Design Approach for Heterogeneous Wireless Access Protocol Transceivers, The Pacific Journal of Science and Technology, vol.14.Issue 1, May 2013 pp 216 – 222
International Conferences
2014
1. Ahmed M. Al-Samman,Uche A. K. Chude-Okonkwo, R. Ngah and Solomon Nunoo,” Experimental Characterization of an UWB Channel in outdoor Environment ” IEEE 10th International Colloquium on Signal Processing and Its Applications (CSPA 2014), Kuala Lumpur, 7-9 March 2014.
2. Uche A. K. Chude-Okonkwo, Solomon Nunoo, and Razali Ngah, “Diffusion-Based Molecular Communication Concentration and Capacity Dependencies on Human Body Temperature Variation”, IEEE 10th International Colloquium on Signal Processing and Its Applications (CSPA 2014), Kuala Lumpur, 7-9 March 2014.
3. Solomon Nunoo, Uche A. K. Chude-Okonkwo, Razali Ngah, and Ahmed Al-Samman, “UWB Channel Measurement and Data Transfer Analysis for Multiuser Infostation Applications” IEEE 10th International Colloquium on Signal Processing and Its Applications (CSPA 2014), Kuala Lumpur, 7-9 March 2014.
4.Yasser Zahedi, Razali Ngah, Uche A.K. Chude-Okonkwo, Solomon Nunoo, Mastaneh Mokayef, “ Modeling the RMS Delay Spread in Time-Varying UWB Communication Channels”,International Conference on Intelligent and Advanced Systems (ICIAS2014), Kuala Lumpur ,3-5 June 2014,
5. Hamza M.R.Al-Khafaji, Razali Ngah, S.A.Aljunid, Tharek Abd Rahman, “An Innovative Encoding/Decoding Architecture Based on Two-Code Keying for SAC-OCDMA Systems”, 5th International Conference on Photonics (ICP 2014),Kuala Lumpur, 2-4 September 2014,
6. Yasser Zahedi, Razali Ngah, Uche A.K. Chude-Okonkwo, Solomon Nunoo, Mastaneh Mokayef “UWB Channel Measurement and Development of Scatterer
Identification Algorithm” The 2nd International Conference on Electronic Design (ICED 2014), Penang, 19-21 August 2014.
7. Solomon Nunoo, Uche A. K. Chude-Okonkwo, and Razali Ngah , “Variable Step- Size l0 – Norm NLMS Algorithm for Sparse Channel Estimation”, (APWiMOB 2014), Bali, Indonesia, 28-30 August 2014.
8. Yasser Zahedi, Razali Ngah, Uche A. K. Okonkwo, Solomon Nunoo and Mastaneh Mokayef “Measurement and Analysis of an Outdoor MIMO-UWB Communication Channel” (APWiMOB 2014), Bali, Indonesia, 28-30 August 2014.
2013
1. Jaya, A.S.M., Hashim, S.Z.M., Haron, H.,Ngah, R., Muhamad, M.R., Rahman, M.N.A. “Modeling of ANFIS in predicting TiN coatings roughness” 2013 5th International Conference on Computer Science and Information Technology, CSIT 2013 , art. no. 6588751 , pp. 13-18 , 2013.
2. Musdholifah, A., Hashim, S.Z.M., Ngah, R. “ Robust Local Triangular Kernel density-based clustering for high-dimensional data" 2013 5th International COnference on COmputer Science and Information Technology , CSIT 2013 , art no. 6588753, pp. 24-32,20133. Al-Samman, A.M., Rahman, T.A.,Chude-Okonkwo, U.A.K., Ngah, R. “Hybrid channel estimation for LTE downlink” 2013 IEEE 9th International Colloquium on Signal Processing and its Applications, CSPA 2013 , art. no. 6530011 , pp. 44-48, 2013
4. Teguh Prakoso, Razali Ngah, Tharek Abdul Rahman "Isolation Enhancement and Size Reduction of Printed-Antenna Pairs for Broadband Microwave-Photonic Access-Point" 20th Internation Conferences on Telecommunications 2013 (ICT 2013),Casablanca, Morocco,6-8 May 2013.
5. Nael Ahmed Mohammed, S.I.S Hassan, Fareq Malek, Razali Ngah, Sura Adil Abbas, " Optical Generation of 60-GHz Signal for Millimeter wave Wireless Communication", 2013 IEEE International RF and Microwave (RFM) Conference, Penang, 9-11 Dec 2013.
6.Uche Kennedy Okonkwo, Razali Ngah, Solomon Nunoo," Time-varying UWB channel model for mobile robot-to-robot communication systems", 2013 11th IEEE Malaysia International Conference on Communications, Kuala Lumpur, 26-28 November 2013.
7. Nael Ahmed Al-Shareefi, S.I.S Hassan, Fareq Malek, Razali Ngah, Syed Alwee Aljunid, Sura Adil Abbas, Noor Anida, A study in OCS millimeter-wave generation using two parallel DD-MZMs, 2013 11th IEEE Malaysia International Conference on Communications, Kuala Lumpur, 26-28 November 2013.- dec
8. Solomon Nunoo, Uche Kennedy Okonkwo, Razali Ngah," Path loss and time dispersion analysis for outdoor roadway UWB propagation channel", 2013 11th IEEE Malaysia International Conference on Communications, Kuala Lumpur, 26-28 November 2013.
9. Uche A.K. Chude-Okonkwo, Solomon Nunoo, Razali Ngah, Chollete Olisah Chude, Tharek Abd Rahman, and Anthony A. Okafor, " Characterization and Parameterization of a Class of Multivariable Non-Summable Stochastic Processes with Bounded Stochastic Trends", 2013 IEEE International Conference on Signal and Image Processing Applications, 8-10 October 2013, Melaka.
10. Solomon Nunoo, Uche A. K. Chude-Okonkwo, Razali Ngah," Performance of LMS, NLMS and LMF Algorithms in Tracking Time-Varying UWB Channels ", 2013 IEEE International Conference on SIgnal and Image Processing Applications, 8-10 October 2013, Melaka.
11. Uche A.K. Chude-Okonkwo, Razali Ngah, Solomon Nunoo, Ahmed M. Al-Samman, and Tharek A. Rahman , “Adaptive Transmission Technique for Short Range Mobile UWB and UWA OFDM Communication”, IEEE (GLOBECOM) 2013 Global Communications Conference Exhibition and Industry Forum ,9-13 December 2013, Atlanta GA,USA.
12. Uche A.K. Chude-Okonkwo, Razali Ngah, Yasser Zahedi, Solomon Nunoo, Ahmed Al-Saman and Tharek Abd Rahman “Measurement and Time Dispersion Analysis of UWB Channels for Infostation Application in an Outdoor Recreation Park” , 7th International Conference on Signal Processing and Communication Systems, ICSPCS’2013, 16-18 December 2013, Gold Coast, Australia
13. N.A. Mamat, R. Ngah, U.A.K Chude Okonkwo, R. Dewan, M.A. Romli, "Affine-based time-scale channel simulator for time-varying wireless communication environment", IEEE Symposium on Wireless Technology and Applications, 22-25 September 22 – 25, 2013, Kuching, Malaysia.
2012
1. Okonkwo, U. A. K., Ngah, R., Y. K. Zahedi, S. M. Zaid and Rahman," Measurement and Parameter Description of Time-varying Ultra-wideband Infostation Channel ". Progress in Electromagnetics Research (PIERS 2012) Conference, Kuala Lumpur 27-30 March, 2012.
2. Y. K. Zahedi, Okonkwo, U. A. K., R. Ngah, T.A. Rahman and N.A. Mamat, "Time-Scale Domain Characterization of Ultra- wideband MIMO Channel and Range Extension for Infostation Environment" , IEEE Symposium on Wireless Technology and Applications (ISWTA 2012), Bandung, Indonesia, 23-26 Sept. 2012.
3. U A.K.C Okonkwo, R. Ngah and Tharek A. Rahman," Evolutionary Second-Order Statistical Model for Nonstationarity Wideband Communication Channels", 1st International Symposium on Telecommunication Technologies (ISTT2012), Kuala Lumpur, Nov. 26-28, 2012.
4. N.S.M.Noor, R.Ngah, T.Prakoso and S.N.A.Sukito,"Fiber Drop Point Design for Optical –Wireless Access", 3rd International Conference on Photonics 2012, Penang, 1-3 October 2012.
5. N.S.M.Noor, R.Ngah, T.Prakoso and S.M.Lim," MIMO-OFDM Optical Backhaul Backup System Using WLAN 802.11n", 3rd International Conference on Photonics 2012, Penang, 1-3 October 2012.
6. Nor Aswani Mamat, Uche A.K Chude Okonkwo, Razali Ngah and Yasser K. Zahedi,"Development of Generic Wireless Channel Simulator for Diverse Environment" ,2012 IEEE Asia-Pacific Conference on Applied Electromagnetics (APACE 2012) ,Melaka, December 11-13,2012.
7. Nur Shazwani Mohd Noor, Norliziani Zamuri, Razali Ngah and Teguh Prakoso,"Multiple Input Multiple Output Orthogonal Frequency Division Multiplexing Based Photonic Access Point", 2012 IEEE Asia-Pacific Conference on Applied Electromagnetics (APACE 2012) ,Melaka, December 11-13,2012.
2011
1. Teguh Prakoso, Razali Ngah, Tharek Abdul Rahman, Zabih Ghassemlooy and Uche A.K. Okonkwo, “An Evaluation of Half-Cut Technique to Miniaturize A Microwave- Photonic Access-Point Antenna,” 2011 IEEE International RF and Microwave (RFM) Conference, Kuala Lumpur, 12-14 Dec 2011.
2. Uche A.K. Chude Okonkwo, Razali Ngah, Siti Zaiton Mohd. Hashim, Tharek Abd. Rahman, and Yusnita Rahaya," Bit-Error-Rate Performance of Wavelet-based Multicarrier Transmission in Rayleigh Multipath Channel", The 7th Jordanian International Electrical and Electronics Engineering Conference (JIEEEC 2011), 11 April – 14 April 2011, Amman, Jordan, pp. 1-5.
3. T. Prakoso, R. Ngah, N.F. Nanyan, T.A. Rahman, Y. Rahayu, Z. Ghassemlooy," A Broadband Antenna for Microwave Photonic Access Point", The 7th Jordanian International Electrical and Electronics Engineering Conference (JIEEEC 2011), 11 April – 14 April 2011, Amman, Jordan, pp. 1-5.
4. Reza Firsandaya Malik, Tharek Abdul Rahman, Razali Ngah, and Siti Zaiton Mohd. Hashim," Multipoint Relays Selection using Particle Swarm Optimization in OLSR for File Transfer Protocol Application" , The 7th Jordanian International Electrical and Electronics Engineering Conference (JIEEEC 2011), 11 April – 14 April 2011, Amman,Jordan, pp. 1-7.
5. Uche A.K. Chude Okonkwo, Razali Ngah, Tharek Abdul Rahman, Chollette Chude, and Uche Teguh Prakoso, “Time-Varying Infostation Channel Characterization,” 2011 IEEE International RF and Microwave (RFM) Conference, Kuala Lumpur, 12-14 Dec 2011.
6. Uche A.K. Chude Okonkwo, Razali Ngah, and Tharek Abdul Rahman, “Non-WSSUS Analysis of Measurement Data for Mobile Communication Channel”, The 17th Asia- Pasific Conference on Communications, Kota Kinabalu Sabah, 2-5 October 2011.
7. Muhamad Hatta bin Hussain, Razali Ngah, Uche A.K. Okonkwo, Siti Rafidah Abdul Rahim, Maliki Ibrahim, Nur Adyani Mohd Affendi, Nor Haidar Hashim, “Digital Modulation Technique using Wavelet”, 2nd-5th August 2010.
8. Muhamad Hatta Hussain, Maliki Ibrahim, Razali Ngah, Uche A.K. Okonkwo, Siti Rafidah Abdul Rahim, Norhaidar Hashim, “Wavelet Shift Keying based Digital Signal Transmission”, Proceedings of EnCon 2011, 4th Engineering International Conference, Kuching, Sarawak, Malaysia. 29th November – 1st December 2011.
9.Maliki Ibrahim, Muhamad Hatta Hussain, Siti Rafidah Abdul Rahim, Norhaidar Hashim, Razali Ngah, Uche A.K.Okonkwo, “Wavelet based receiver for Digital Communication System”, 3rd CUTSE International Conference on Innovative Green Technology for Sustainable Development, Miri, Sarawak, Malaysia. 8th-9th November, 2011.
10. "Employing multiple wavelengths for an input packet to achieve uniform SOA gain for high speed optical applications", 16th European Conference on Networks and Optical Communications (NOC).
2010
1. Y. Rahayu, R. Ngah, and T. A. Rahman, “A small slotted ultra wideband slotted antenna with slotted ground plane,” in Ultra Wideband, 1st ed., B. lembrikov, Ed. Intech, 2010, pp. 427-444.
2. Y. Rahayu, R. Ngah, and T. A. Rahman, “Various Slotted UWB Antenna Design,” in Wireless and Mobile Communications (ICWMC), 2010 6th International Conference on, 2010, pp. 107-110.
3. Y. Rahayu, R. Ngah, and T. A. Rahman, “Current distribution characteristics of various T slotted ultra wideband antenna,” in Wireless Information Technology and Systems (ICWITS), 2010 IEEE International Conference on, 2010, pp. 1-4.
4. N. F. Nanyan, R. Ngah, T. Prakoso, Y. Rahayu, and T. A. Rahman, “An active downlink photonic antenna,” in Photonics (ICP), 2010 International Conference on, 2010, pp. 1-5.
5. U. A. K. Okonkwo, R. Ngah, Z. Ghassemlooy, and T. A. Rahman, “Stochastic Time-scale Channel Characterization of Nonstationary Underwater Communication Channel,” T0.
6. U. A. K. Okonkwo, R. Ngah, Z. Ghassemlooy, and T. A. Rahman, “Non-WSSUS Time-Scale Characterization of High Speed Train Communication Channel,”
7. U. A. K. C. Okonkwo, S. Z. M. Hashim, R. Ngah, N. F. Nanyan, and T. A. Rahman, “Time-scale domain characterization of nonstationary wideband vehicle-to-vehicle propagation channel,” in Applied Electromagnetics (APACE), 2010 IEEE Asia-Pacific Conference on, 2010, pp. 1-6.
8. U. A. K. Okonkwo, R. Ngah, Z. Ghassemlooy, and T. A. Rahman, “Eigen Solution and Declassification of Some Overspread Underwater Communication Channels,” The 3rd International Conference on Underwater System Technology:Theory and Applications. USYS 2010 . 2010.
9. U. A. K. Okonkwo, R. Ngah, Z. Ghassemlooy, and T. A. Rahman, “Geometrical-based Channel Simulation Model for Ultra Wideband Environment,” 4th International Symposium On Broadband Communication. ISBC 2010. 2010.
10. Y. Rahayu, R. Ngah, and T. A. Rahman, “Slotted ultra wideband antenna for bandwidth enhancement,” in Ultra Wideband, 1st ed., B. lembrikov, Ed. Intech, 2010, pp. 445-458.
11. T. Prakoso, R. Ngah, T. A. Rahman, and Z. Ghassemlooy, “A high gain active photonic antenna for high speed backhaul link: A system analysis,” in Telecommunications (ICT), 2010 IEEE 17th International Conference on, 2010, pp. 455-461.
12. A. A. El Aziz, W. P. Ng, Z. Ghassemlooy, M. H. Aly, R. Ngah, and M. F. Chiang, “Impact of signalwavelength on the semiconductor opticalamplifier gain uniformity for high speed optical routers employing the segmentation model,” in Information Sciences Signal Processing and their Applications (ISSPA), 2010 10th International Conference on, 2010, pp. 259-262.
13. A. Salleh, A. S. Ja’afar, M. Z. A. Abd. Aziz, and R. Ngah, “Active Mode Radio Access Point at 2.4 GHz for Radio over Fiber Technology,” 4th International Symposium On Broadband Communication. ISBC 2010. 2010.
14. A. Abd El Aziz, W. P. Ng, Z. Ghassemlooy, M. H. Aly, and R. Ngah, “SOA gain uniformity improvement employing a non-uniform biasing technique for ultra-high speed optical routers,” in Communication Systems Networks and Digital Signal Processing (CSNDSP), 2010 7th International Symposium on, 2010, pp. 642-647
2009
1. Yusnita Rahayu, Tharek A. Rahman, Razali Ngah, and Peter S. Hall," Small Printed Ultra Wideband Antenna with Coupled Slot" , Accepted for Loughborough Antennas & propagation Conference (LAPC 2009), Loughborough University, UK.
2. Uche A. K Okonkwo, Razali Ngah, and Tharek Abdul Rahman, “Wavelet-Based Digital Modulation Technique,” Accepted for IEEE 9th Malaysia International Conference on Communications (MICC'09), Kuala Lumpur, Dec 2009.
3. A. A. El Aziz, W. P. Ng, Z. Ghassemlooy, M. H. Aly, R. Ngah, and M. F. Chiang, "The effect of the input energy on the SOA gain with non-uniform biasing," in 14th European Conference on Networks and Optical Communications (NOC09), Vallodolid, Spain, 10-12 June 2009, pp. 307-315.
4. Teguh Prakoso, Razali Ngah, Tharek Abdul Rahman, and Z. Ghassemlooy, “A Capacity Analysis of Outdoor-Backhaul Network Using WLAN and Radio over Fiber Technology”, Accepted for IEEE International Conference on Antennas, Propagation, and Systems (INAS 2009), 3-5 Dec. 2009, Johor Bahru, Malaysia.
5. Nurul Huda binti Ismail, Razali Ngah, Teguh Prakoso, Tharek Abdul Rahman,, and Z. Ghassemlooy, “Wireless Local Area Network Bridging Using Radio over Fiber Technology”, Accepted for IEEE International Conference on Antennas, Propagation, and Systems (INAS 2009), 3-5 Dec. 2009, Johor Bahru, Malaysia.
6. Nadia Nawawi, Razali Ngah, Teguh Prakoso, Tharek Abdul Rahman, and Z. Ghassemlooy, “Wireless Local Area Network System Employing Free Space Optic Communication Link”, Accepted for IEEE International Conference on Antennas, Propagation, and Systems (INAS 2009), 3-5 Dec. 2009, Johor Bahru, Malaysia.
7. Uche A. K Okonkwo, Razali Ngah, Frank N. Igboamalu, Zabih Ghassemloy and Tharek Abdul Rahman, “Mobile Radio Channel Characterization and Stationarity Issues”, Accepted for IEEE International Conference on Antennas, Propagation, and Systems (INAS 2009), 3-5 Dec. 2009, Johor Bahru, Malaysia.
2008
1. Yusnita Rahayu, Tharek A. Rahman, Razali Ngah, and Peter S. Hall, “Slotted Ultra Wideband Antenna for Bandwidth Enhancement,” Loughborough Antennas & propagation Conference (LAPC 2008), 17-18 Mac. 2008, Loughborough university, UK.
2. Teguh Prakoso, Razali Ngah, and Tharek Abdul Rahman, “Representation of Antenna in Two-Port Network S-Parameter,” 2008 International RF and Microwave (RFM) Conference, Kuala Lumpur, 2 -4 Dec 2008.
3. Teguh Prakoso, Razali Ngah, Tharek Abdul Rahman, and Mohd Amin Mualif “5.8 GHz photonic antenna for point-to-point applications,” 2008 International RF and Microwave (RFM) Conference, Kuala Lumpur, 2 -4 Dec 2008.
4. Teguh Prakoso, Razali Ngah, and Tharek Abdul Rahman, “Active Photonic Antenna for Wireless Communications at 2.4 GHz,” 2008 IEEE International RF and Microwave (RFM) Conference, Kuala Lumpur, 2-4 Dec 2008, pp. 497-500.
5. Uche A. K Okonkwo, Razali Ngah, and Tharek Abdul Rahman, “Wavelet-Domain Channel Characterization for Mobile Broadband Communication Systems,” 2008 International RF and Microwave (RFM) Conference, Kuala Lumpur, Dec 2008.
6. Yusnita Rahayu,Tharek Abd Rahman, Razali Ngah, P.S. Hall “Ultra Wideband Technology and Its Applications”, Forth International Conference on Wireless and Optical Communications Network (WOCN 2008), Surabaya Indonesia, Mei 2008
7. Yusnita Rahayu, Tharek Abd Rahman, Razali Ngah, P.S. Hall, “A Small Novel Ultra Wideband Antenna with Slotted Ground Plane”, International Conference on Computer and Communication Engineering 2008 (ICCCE 08) Kuala Lumpur Malaysia, Mei 2008.
8. Y.R. Naumar, T.A. Rahman, R. Ngah, P.S. Hall, “Numerical analysis of Small Slotted Ultra Wideband Antenna Based on Current Distribution for bandwidth Enhancement”, European Electromagnectics (EUROEM 2008), Lausanne,Switzerland. Julai 2008.
9. Nani Fadzlina Naim, Razali Ngah, Zabih Ghassemlooy, Suzi Seroja Sarnin," Modelling of All-Optical Symmetric Mach-Zehnder Switch with Asymmetric Coupler",2008 International RF and Microwave (RFM) Conference, Kuala Lumpur, Dec 2008.
10. Ahmad Said Chahine, Ali K. Aswad, Uche A. K Okonkwo and Razali Ngah, " Study the Performance of OFDM Radio over Fiber for Wireless Communication Systems", 2008 International RF and Microwave (RFM) Conference, Kuala Lumpur, Dec 2008.
11. A. A. El Aziz, W. P. Ng, Z. Ghassemlooy, M. H. Aly, R. Ngah, and M. F. Chiang, "Characterization of the semiconductor optical amplifier for amplification and photonic switching employing the segmentation model," in International Conference on Transparent Optical Networks "Mediterranean Winter" (ICTON-MW'08), Invited Paper, Marrakech, Morocco, 2008, pp. Fr1A.1 (1-6).
2007
1. Razali Ngah, Yusnita Rahayu, Teguh Prakoso and Mohd Shukri Othman, “Printed square UWB antenna,” International Conference on Electrical Engineering and Informatics (ICEEI2007), 17th – 19th June, 2007.
2. Razali Ngah, Teguh Prakoso and Yusnita Rahayu,, “ Coverage range and cost comparison of RAU designs for in-building RoF ”, International Conference on Electrical Engineering and Informatics (ICEEI2007), 17th – 19th June, 2007.
3. Razali Ngah, Reza Abdolee, Tharek Abd Rahman, and Vida Vakilian, “Comparative analysis of four wave mixing effect between conventional optical and radio over fiber system,” International Conference on Robotics, Vision, Information and Signal Processing, Penang, Malaysia, vol. 1, 4 pp, 28-30 Nov 2007.
4. Reza Abdolee, Razali Ngah, Vida Vakilian and Tharek A.Rahman," Application of Radio-Over-Fiber (ROF) in mobile communication", Asia Pacific Conference on Applied Electromagnetics (APACE2007), Malacca, Malaysia, 5th – 6st Dec. 2007.
5. Mohamed Sherfi Omer AbuElHassan and Razali Ngah," Secured Indoor Powerline Communication Using CDMA Technique", Asia Pacific Conference on Applied Electromagnetics (APACE2007), Malacca, Malaysia, 5th – 6st Dec. 2007.
6. Firsandaya Malik, Reza., Abdul Rahman, Tharek., Mohd Hashim, Siti Zaiton., and Ngah, Razali., “Empirical Study of Sigmoid Increasing Inertia Weight in Particle Swarm Optimization”, International Conference on Robotics, Visions, Information and Signal Processing (ROVISP 2007), 28 – 30 November 2007, Universiti Sains Malaysia, Penang.
7. Firsandaya Malik, Reza., Abdul Rahman, Tharek., Mohd Hashim, Siti Zaiton., and Ngah, Razali., “Sigmoid Increasing Inertia Weight for Particle Swarm Optimization”, 1st International Workshop on Hybrid Soft Computing in Engineering, ICT and Social Science, 3rd Desember 2007, Senai, Johor.
2005
1. Razali Ngah, and Zabih Ghassemlooy, “Self-synchronization scheme for OTDM packet signal using a symmetric Mach-Zehnder switch,” IEEE 7th MalaysiaInternational Conference on Communication/13th IEEE International Conference on Networks, vol. 1, pp. 4 pp, 16-18 Nov. 2005.
2. Yusnita Rahayu, Razali Ngah, and Tharek A. Rahman, “Simulation of wideband inverted suspended path antenna,” Asia Pacific Conference on Applied Electromagnetics (APACE2005), 20th – 21st Dec. 2005.
2004
1. R. Ngah, and Z. Ghassemlooy, “BER performance of an OTDM demultiplexer based on SMZ switch” Postgraduate Research Conference in Electronic, Photonics, Communication & Networks, and Computing Science, Hertfordshire, U.K., 5-7 April 2004, pp 228 –229.
2. R. Ngah, and Z. Ghassemlooy, “Bit Error Rate Performance of All-Optical Router Based on SMZ Switches,” First IFIP International Conference on Wireless and Optical Communications Networks (WOCN 2004), Oman, 7 – 9 June 2004. pp. 110-113.
3. R. Ngah, and Z. Ghassemlooy, “The Performance of an OTDM Demultiplexer Based on SMZ Switch,” IEE Seminar on Future Challenges and Opportunities for DWDM and CWDM in the Photonic Networks, University of Warwick, U.K., 11 June 2004.
4. R. Ngah, and Z. Ghassemlooy, “Simulation of Simultaneous All-Optical Clock Extraction and Demultiplexing for OTDM Packet Signal Using SMZ Switches,” 9th European Conference on Networks & Optical Communications (NOC 2004), Eindhoven, Holland, 29 June – 1 July 2004, pp. 437-442.
5. R. Ngah, and Z. Ghassemlooy, “Noise and Crosstalk Analysis of SMZ Switches,” International Symposium on Communication Systems, Networks and Digital Signal Processing (CSNDSP 2004), University of Newcastle, U.K., 20 - 22 July 2004, pp. 160-163.
6. Hoa Le-Minh, Z. Ghasemmloy, W. P. Ng, and R. Ngah,"Terahertz optical asymmetric demultiplexer switch with a symmetrical switching window", Annual London Conference on Communication, London, UK, 13-14 Sept. 2004, pp. 89-92.
2003
1. R. Ngah, Z. Ghassemlooy, and G. Swift, “40 Gb/s All-Optical Router Using Terahertz Optical Asymmetric Demultiplexer (TOADs)” International Conference on Robotics, Vision, Information and Signal Processing, Penang, Malaysia, 22-24 Jan 2003, pp. 179-183.
2. R. Ngah, Z. Ghassemlooy, and G. Swift, “Simulation of 1 ´ 2 OTDM router employing Symmetric Mach-Zehnder (SMZ)” Postgraduate Research Conference in Electronic, Photonics, Communication & Networks, and Computing Science, Exeter, U.K., 14-16 April 2003, pp 105-106.
3. R. Ngah, Z. Ghassemlooy, and G. Swift, “Comparison of Interferometric all-optical switches for router applications in OTDM systems” 4th Annual Postgraduate Symposium on Convergence of Telecommunications, Networking and Broadcasting, Liverpool, U.K., 16-17 June 2003, pp. 81-85.
4. A. Als, R. Ngah, Z. Ghassemlooy, and G. Swift, “Simulation of all-optical recirculating fibre loop buffer employing a SMZ switch” 7th World Multiconference on Systemics, Cybernetics, and Informatics, Florida, U.S.A, 27-30 July 2003, pp 1-5.
2002
1. R. Ngah, Z. Ghassemlooy, G. Swift, T. Ahmad and P. Ball, “Simulation of an all Optical Time Division Multiplexing Router Employing TOADs”, 3rd Annual Postgraduate Symposium on the Convergence of Telecommunications, Networking & Broadcasting, Liverpool, U.K., 17-18 June 2002, pp. 415-420.
2. R. Ngah, Z. Ghassemlooy, and G. Swift, “Simulation of an all Optical Time Division Multiplexing Router Employing Symmetric Mach-Zehnder (SMZ),” 7th IEEE High Frequency Postgraduate Student Colloquium, London, U.K., 8-9 Sept. 2002, pp. 133-139.
National Conferences
1. Razali Ngah, Imran Ibrahim, and W. Khairuddin W. Ali, “Absorbers analysis for anechoic chamber,” NCTT 2000, Johor Bahru, 20-21 Nov 2000.
2. Mazlina Esa, Sh. Kamilah Sy. Yusof, and Razali Ngah, “Preliminary investigation of electromagnetic disturbance from wireless telephones,” Seminar Penyelidikan Dalam Bidang Elektrik, Elektronik, Aeroangkasa, Teknologi Maklumat & Telekomunikasi, 18 March 1998.