INVENTION DISCLOSURES

[1] T. M. N. Ngatched, A. S. Alfa, and J. Cai “Two Low Complexity Decoding Algorithms for LDPC Codes,” U.S patent 61/525,975.

JOURNAL ARTICLES

[1] A. R. Ndjiongue, T. M. N. Ngatched, and O. A. Dobre, “Impact of the Refractive Index on the Achievable Rate of Liquid Crystal-Based Digital-RIS Indoor VLC Systems,” IEEE Photonic Journal. Accepted.

[2] S. B. Aboagye, A. R. Ndjiongue, T. M. N. Ngatched, O. A. Dobre, and H. V. Poor “RIS-Assisted Visible Light Communication Systems: A Tutorial,” IEEE Communications Surveys and Tutorials. Accepted.

[3] M. Amir, E. Bedeer, T. Khattab, and T. M. N. Ngatched, “Dynamic Coded Caching for Files with Time-Varying Features and Content,” IEEE Trans. Commun., vol. 70, no. 12, pp. 7858 – 7871, Dec. 2022.

[4] S. B. Aboagye, A. R. Ndjiongue, T. M. N. Ngatched, and O. A. Dobre, “Design and Optimization of Liquid Crystal RIS-based Visible Light Communication Receivers,” IEEE Photon. J. vol. 14, no. 6, Dec. 2022, Art. no. 7355607

[5] M. H. A. Khoshafa, T. M. N. Ngatched, and M. H. Ahmed, “Relay Selection for Improving Physical layer Security in D2D Underlay Communications,” IEEE Access., vol. 10, pp. 95539 - 95552, Sep. 2022.

[6] G. She, S. B. Aboagye, T. M. N. Ngatched, O. A. Dobre, Y. Li, and W. Cheng “Secure Transmission on NOMA-Aided Multi-User Visible Light Communication Broadcasting Networks with Cooperative Precoding Design,” IEEE Trans. Inf. Forensics Secur., vol. 17, pp. 3123 – 3138, Aug. 2022.

[7] A. R. Ndjiongue, T. M. N. Ngatched, O. A. Dobre, and H. Haas, “Digital RIS (DRIS): The Future of Digital Beam Management in RIS-Assisted OWC Systems,” IEEE/OSA Journal of Lightwave Technology, vol. 40, no. 16, pp. 5597 – 5604, Aug. 2022.

[8] A. Faisal, I. Al-Nahhal, O. A. Dobre, and T. M. N. Ngatched, “Deep Reinforcement Learning for RIS-Assisted FD Systems: Single or Distributed RIS?,” IEEE Commun. Lett., vol. 26, no. 7, pp. 1563 – 1567, Jul. 2022.

[9] S. B. Aboagye, T. M. N. Ngatched, and O. A. Dobre, “Subchannel and Power Allocation in Downlink VLC under Different System Configurations,” IEEE Trans. Wireless Commun., vol. 21, no. 5, pp. 3179 – 3191, May 2022.

[10] A. R. Ndjiongue, T. M. N. Ngatched, and O. A. Dobre, “On the Capacity of RIS-Assisted Intensity-Modulation Optical Channels,” IEEE Commun. Lett., vol. 26, no. 2, pp. 389 – 393, Feb. 2022.

[11] I. Al-Nahhal, O. A. Dobre, E. Basar, T. M. N. Ngatched, and S. Ikki, “Reconfigurable Intelligent Surface Optimization for Uplink Sparse Code Multiple Access,” IEEE Commun. Lett., vol. 26, no. 1, pp. 133 – 137, Jan. 2022.

[12] A. R. Ndjiongue, T. M. N. Ngatched, O. A. Dobre, and H. Haas, “Design of a Power Amplifying-RIS for Free-Space Optical Communication Systems,” IEEE Wireless Commun., vol. 28, no. 6, pp. 152 – 159, Dec. 2021.

[13] A. Faisal, I. Al-Nahhal, O. A. Dobre, and T. M. N. Ngatched, “Deep Reinforcement Learning for Optimizing RIS-Assisted HD-FD Wireless Systems,” IEEE Commun. Lett., vol. 25, no. 12, pp. 3893 – 3897, Dec. 2021.

[14] S. B. Aboagye, T. M. N. Ngatched, O. A. Dobre, and A. R. Ndjiongue, “Intelligent Reflecting Surfaces-Aided Visible Light Communication Systems,” IEEE Commun. Lett., vol. 25, no. 12, pp. 3913 – 3917, Dec. 2021.

[15] M. H. A. Khoshafa, T. M. N. Ngatched, M. H. Ahmed, and A. R. Ndjiongue, “Active Reconfigurable Intelligent Surfaces-Aided Wireless Communication System,” IEEE Commun. Lett., vol. 25, no. 11, pp. 3699 – 3703, Nov. 2021.

[16] A. R. Ndjiongue, T. M. N. Ngatched, O. A. Dobre, Ana G. Arnada, and H. Haas, “Analysis of RIS-based T-FSO link over G-G turbulence with distance and jitter ratios,” IEEE/OSA Journal of Lightwave Technology, vol. 39, no. 21, pp. 6746 – 6758, Nov. 2021.

[17] A. R. Ndjiongue, T. M. N. Ngatched, O. A. Dobre, and H. Haas, “Towards the Use of Re-configurable Intelligent Surfaces in VLC Systems: Beam Steering,” IEEE Wireless Commun., vol. 28, no. 3, pp. 156 – 162, Jun. 2021.

[18] S. B. Aboagye, T. M. N. Ngatched, O. A. Dobre, and A. Ibrahim, “Joint Access Point Assignment and Power Allocation in Multi-tier Hybrid RF/VLC Networks,” IEEE Trans. Wireless Commun., vol. 20, no. 10, pp. 6329 – 6342, Oct. 2021.

[19] M. H. A. Khoshafa, J. M. M. Moualeu, T. M. N. Ngatched, and M. H. Ahmed, “On the Performance of Secure Underlay Cognitive Radio Networks with Energy Harvesting and Dual-Antenna Selection,” IEEE Commun. Lett., vol. 25, no. 6, pp. 1815 – 1819, Jun. 2021.

[20] A. R. Ndjiongue, T. M. N. Ngatched, O. A. Dobre, and H. Haas, “Re-configurable Intelligent Surface-based VLC Receivers Using Tunable Liquid-crystals: The Concept,” IEEE/OSA Journal of Lightwave Technology, vol. 39, no. 10, pp. 3193 – 3200, May 2021.

[21] S. B. Aboagye, T. M. N. Ngatched, O. A. Dobre, and Ana G. Arnada “Energy Efficient Subchannel and Power Allocation in Cooperative VLC Systems,” IEEE Commun. Lett., vol. 25, no. 6, pp. 1935 – 1939, Jun. 2021.

[22] M. H. A. Khoshafa, T. M. N. Ngatched, and M. H. Ahmed, “Reconfigurable Intelligent Surfaces-Aided Physical Layer Security Enhancement in D2D Underlay Communications,” IEEE Commun. Lett., vol. 25, no. 5, pp. 1443 – 1447, May 2021

[23] M. H. A. Khoshafa, T. M. N. Ngatched, and M. H. Ahmed, “On the Physical Layer Security of Underlay Relay-Aided Device-to-Device Communications,” IEEE Trans. Veh. Tech. vol. 69, no. 7, pp. 7609 – 7621, Jul. 2020.

[24] M. H. A. Khoshafa, T. M. N. Ngatched, M. H. Ahmed, and A. Ibrahim, “Secure Transmission in Wiretap Channels Using Full-Duplex Relay-Aided D2D Communications With Outdated CSI,” IEEE Wireless Commun. Lett. vol. 9, no. 8, pp. 1216 – 1220, Aug. 2020.

[25] J. M. M. Moualeu and T. M. N. Ngatched, “Physical-Layer Security Enhancement via Relay-Aided D2D Communications Underlaying Cellular Network,” IEEE Open Journal of the Communications Society, vol. 1, pp. 413 – 427, Apr. 2020.

[26] M. H. A. Khoshafa, T. M. N. Ngatched, M. H. Ahmed, and A. Ibrahim, “Improving Physical layer Security Using Full-Duplex Jamming Relay-Aided D2D Communication,” IEEE Access., vol. 8, pp. 53575 - 53586, Mar. 2020.

[27] S. B. Aboagye, A. Ibrahim, and T. M. N. Ngatched, “Energy Efficient User Association, Power and Flow Control in Millimeter Wave Backhaul Heterogeneous Networks,” IEEE Open Journal of the Communications Society, vol. 1, pp. 41 – 59, Jan. 2020.

[28] S. B. Aboagye, A. Ibrahim, and T. M. N. Ngatched, “Frameworks for Energy Efficient Maximization in HetNets with Millimeter Wave Backhaul Links,” IEEE Transactions on Green Communications and Networking, vol. 4, no. 1, pp. 83 – 94, Mar. 2020.

[29] S. B. Aboagye, A. Ibrahim, T. M. N. Ngatched, A. R. Ndjiongue, and O. A. Dobre, “Design of Energy Efficient Hybrid VLC/RF/PLC Communication System for Indoor Networks,” IEEE Wireless Commun. Lett. vol. 9, no. 2, pp. 143 – 147, Feb. 2020.

[30] A. R. Ndjiongue, T. M. N. Ngatched, O. A. Dobre, and A. G. Armada, “VLC-Based Networking: Feasibility and Challenges,” IEEE Netw., vol. 34, no. 4, pp. 158 – 165, Jul./Aug. 2020.

[31] A. Ibrahim, O. A. Dobre, T. M. N. Ngatched, and A. G. Armada “Bender’s Decomposition for Optimization Design Problems in Communication Networks,” IEEE Network Magazine, vol. 34, no. 3, pp. 232 – 239, May/Jun. 2020.

[32] A. Ibrahim, T. M. N. Ngatched, and O. A. Dobre, “Using Bender's Decomposition for Optimal Power Control and Routing in Multihop D2D Cellular Systems,” IEEE Trans. Wireless Commun., vol. 18, no. 11, pp. 5050 – 5064, Nov. 2019.

[33] X. Lin, O. A. Dobre, T. M. N. Ngatched, and C. Li, “A Non-Data-Aided OSNR Estimation Algorithm for Coherent Optical Fiber Communication Systems Employing Multilevel Constellations” IEEE Journal of Lightwave Technology, vol. 37, no. 15, pp. 3815 – 3825, Aug. 2019.

[34] J. M. M. Moualeu, D. B. da Costa, F. Javier Lopez-Martinez, W. Hamouda, T. M. N. Ngatched, and U. S. Dias “Transmit Antenna Selection in Secure MIMO Systems over in α-µ Fading Channels,” IEEE Trans. Commun., vol. 67, no. 9, pp. 6483 – 6498, Sep. 2019.

[35] A. R. Ndjiongue, T. M. N. Ngatched, and H. C. Ferreira “Hybrid APSK-CSK Systems Based on Kite and Color Wheel Constructions” IEEE Systems Journal, vol. 13, no. 3, pp. 2396 – 2407, Sep. 2019.

[36] R. Zhao, H. Long, O. A. Dobre, X. Shen, T. M. N. Ngatched, and H. Mei “Time Reversal based MAC for Multi-Hop Underwater Acoustic Networks” Accepted for publication in IEEE Systems Journal, vol. 13, no. 3, pp. 2531 – 2542, Sep. 2019.

[37] A. Dubey, C. Kundu, T. M. N. Ngatched, O. A. Dobre, and R. K. Mallik, “Incremental Relaying for Power Line Communication: Performance Analysis and Power Allocation” Accepted for publication in IEEE Systems Journal, vol. 13, no. 4, pp. 4236 – 4247, Dec. 2019.

[38] J. M. M.Moualeu, T. M. N. Ngatched, and D. B. da Costa “Sequential Relay Selection in D2D-Enabled Cellular Networks with Outdated CSI Over Mixed Fading Channels,” IEEE Wireless Commun. vol. 8, no. 1, pp. 245 – 248, Feb. 2019.

[39] X. Lin, O. A. Dobre, T. M. N. Ngatched, Y. Eldemerdash, and C. Li, “Joint Modulation Classification and OSNR Estimation by Support Vector Machine” Accepted for publication in IEEE Photonics Technology Letters, vol. 30, no. 24, pp. 2127 – 2130, Dec. 2018.

[40] A. R. Ndjiongue, T. M. N. Ngatched, and H. C. Ferreira “On the Indoor VLC Link Evaluation Based on the Racian K-Factor” Accepted for publication in IEEE Communications Lett., vol. 22, no. 11, pp. 2254 – 2257, Nov. 2018.

[41] O. Omomukuyo, O. A. Dobre, R. Venkatesan, and T. M. N. Ngatched “Discrete FRFT-Based Frame and Frequency Synchronization for Coherent Optical Systems” IEEE Photonics Technology Letters, vol. 29, no. 23, pp. 2016 – 2019, Dec. 2017.

[42] C. Kundu, S. G. Ghose, T. M. N. Ngatched, O. A. Dobre, and T. Q Duong “Effects of CSI Knowledge on Secrecy of Threshold-Selection Decode-and-Forward Relaying,” IEEE Access., vol. 5, pp. 19393 - 19408, Oct. 2017.

[43] A. R. Ndjiongue, H. C. Ferreira, and T. M. N. Ngatched “Closed-Form SER Expression for APSK Based on the Kite Structure” IEEE Commun. Lett., vol. 21, no. 10, pp. 2182 – 2185, Oct. 2017.

[44] O. Omomukuyo, O. A. Dobre, R. Venkatesan, and T. M. N. Ngatched “Synchronization for Next-Generation High-Speed Coherent Optical Transmission Systems: A Robust and Bandwidth-Efficient Method,” IEEE Instrumentation & Measurement Magazine, vol. 20, no. 5, pp. 39 – 45, Oct. 2017.

[45] A. D. Mafuta, T. Walingo, and T. M. N. Ngatched “Energy Efficiency Coverage Extension Relay Node Placement in LTE-A Networks,” IEEE Commun. Lett., vol. 21, no. 7, pp. 1617 – 1620, Jul. 2017.

[46] O. Omomukuyo, D. Chang, O. A. Dobre, R. Venkatesan, and T. M. N. Ngatched “Robust Frame and Frequency Synchronization Based on Alamouti Coding for RGI-CO-OFDM” IEEE Photonics Technology Letters, vol. 28, no. 24, pp. 2783 – 2786, Dec. 2016.

[47] A. R. Ndjiongue, T. Shongwe, H. C. Ferreira, T. M. N. Ngatched, and A. J. H. Vinck, “PSK to CSK Mapping for Hybrid Systems Involving the Radio Frequency and the Visible Spectrum” Springer Telecommun. Syst., pp. 1-20, May 2016.

[48] O. Omomukuyo, D. Chang, O. A. Dobre, R. Venkatesan, and T. M. N. Ngatched “Simple sampling clock synchronization scheme for reduced-guard-interval coherent optical OFDM systems” IET Electron. Lett., vol. 51, no. 24, pp. 2026 – 2028, Nov. 2015.

[49] A. Afana, T. M. N. Ngatched, and O. A. Dobre “Spatial Modulation in MIMO Limited-Feedback Spectrum-Sharing Systems with Mutual Interference and Channel Estimation Errors” IEEE Commun. Lett., vol. 19, no. 10, pp. 1754 – 1757, Oct. 2015.

[50] N. Q. Nhan, T. M. N. Ngatched, O. A. Dobre, P. Rostaing, K. Amis, and E. Radoi, “Multiples-Votes Parallel Symbol-Flipping Decoding Algorithm for Non-Binary LDPC Codes” IEEE Commun. Lett., vol. 19, no. 6, pp. 905 – 908, Jun. 2015.

[51] O. Omomukuyo, D. Chang, J. Zhu, O. A. Dobre, R. Venkatesan, T. M. N. Ngatched, and C. Rumbolt “Joint Timing and Frequency Synchronization Based on Weighted CAZAC Sequences for Reduced-Guard-Internal CO-OFDM Systems,” OSA Optics Express, vol. 23, pp. 5777 – 5788, Mar. 2015.

[52] A. R. Ndjongue, H. Ferreira, and T. M. N. Ngatched “Visible Light Communications (VLC) Technology,” The Wiley Encyclopedia of Electrical and Electronics Engineering. John Wiley and Sons, Inc.DOI:10.1002/047134608X.W8267.

[53] A. Afana, T. M. N. Ngatched, and O. A. Dobre “Cooperative AF Relaying with Beamforming and Limited Feedback in Cognitive Radio Networks,” IEEE Commun. Lett., vol. 19, no. 3, pp. 491 – 494, Mar. 2015.

[54] Ngatched, T. M. N., Alfa, A. S. and Cai, J. (2013) “Cooperative Sensing with Transmit Diversity Based on Randomized STBC in CR Networks,” Int. J. Autonomous and Adaptive Communications Systems, vol. 6, no. 4, pp. 403 – 416.

[55] T. M. N. Ngatched, A. S. Alfa, and J. Cai “A Weighted Queue-Based Model for Correlated Rician Fading Channels,” IEEE Trans. Commun., vol. 59, no. 11, pp. 3049 – 3058, Nov. 2011.

[56] T. M. N. Ngatched, A. S. Alfa, and J. Cai “Hybrid Linear Programming Based Decoding of Finwite-Geometries LDPC Codes,” IEEE Trans. Commun., vol. 59, no. 3, pp. 740 – 749, Mar. 2011.

[57] T. M. N. Ngatched, M. Bossert, A. Fahrner, and F. Takawira “Two bit-flipping decoding algorithms for low-density parity-check codes,” IEEE Trans. Commun., vol. 57, no. 3, pp. 591 – 596, Mar. 2009.

[58] T. M. N. Ngatched, F. Takawira, and M. Bossert “An Improved Decoding Algorithm for Finite-Geometry LDPC codes,” IEEE Trans. Commun., vol. 57, no. 2, pp. 302 – 306, Feb. 2009.

[59] T. M. N. Ngatched and F. Takawira, “An ensemble of iteratively decodable codes constructed based on a superposition method,” IEEE Trans. Commun., vol. 54, no. 11, pp. 1937 – 1947, Nov. 2006.

[60] T. M. N. Ngatched and F. Takawira, “Improved generalized low-density parity-check codes using irregular graphs,” SAIEEE Transactions, vol. 94, pp. 43-49. Dec. 2003.

[61] T. M. N. Ngatched and F. Takawira, “A simple stopping criterion for turbo decoding,” IEE Electronic Letters, vol. 37, no. 22, pp. 1350-1351, Oct. 25, 2001.

CONFERENCE ARTICLES

[1] A. R. Ndjiongue, T. M. N. Ngatched, O. A. Dobre, and H. Haas, “Symbolic Representation of RIS-Assisted FSO Channels,” accepted for presentation at GLOBECOM 2022 Workshop Program, IEEE Global Telecommunications Conference, Rio de Janeiro, Brazil, Dec. 4 – 8, 2022.

[2] A. Faisal, I. Al-Nahhal, O. A. Dobre, and T. M. N. Ngatched, “Distributed RIS-Assisted FD Systems with Discrete Phase Shifts: A Reinforcement Learning Approach,” accepted for presentation at GLOBECOM 2022, IEEE Global Telecommunications Conference, Rio de Janeiro, Brazil, Dec. 4 – 8, 2022.

[3] R. K. M. Ahiaklo-Kuz, C. J. Asiedu, T. M. N. Ngatched, and I. Woungang “Deep Matrix Factorization for Multi-View Clustering using Density-Based Preprocessing,” accepted for presentation at the PAN-African Artificial Intelligence & Smart System 2022 (PA-AI&SS 2022) Conference, Dakar, Senegal, Nov. 2 – 4, 2022.

[4] J. Singh, S. K. Dhurandher, I. Woungang, and T. M. N. Ngatched, “Multi-Agent Reinforcement Learning-based Approach for Vehicle Routing Problem,” accepted for presentation at the PAN-African Artificial Intelligence & Smart System 2022 (PA-AI&SS 2022) Conference, Dakar, Senegal, Nov. 2 – 4, 2022.

[5] S. B. Aboagye, T. M. N. Ngatched, and O. A. Dobre, “Efficient Subchannel and Power Allocation in Multi-cell Indoor VLC Systems” in Proc. the PAN-African Artificial Intelligence & Smart System 2021 (PA-AI&SS 2021) Conference, Windhoek, Namibia, Oct. 7 – 9, 2021.

[6] S. B. Aboagye, T. M. N. Ngatched, O. A. Dobre, and A. Ibrahim, “Matching Theory-Based Joint Access Point Assignment and Power Allocation in Hybrid RF/VLC HetNet,” in Proc. GLOBECOM 2020, IEEE Global Telecommunications Conference, Taipei, Taiwan, Dec. 7 – 11, 2020.

[7] M. H. A. Khoshafa, T. M. N. Ngatched, and M. H. Ahmed, “Secure Transmission in Underlay D2D Communications Using Optimal Relay Selection,” in Proc. VTC2020-Fall, IEEE Vehicular Technology Conference, Victoria, B. C, Canada, Oct. 4 – 7, 2020.

[8] S. B. Aboagye, A. Ibrahim, T. M. N. Ngatched, and O. A. Dobre, “Joint user Association and Power Control for Area Spectral Efficiency Maximization,” in Proc. VTC2020-Fall, IEEE Vehicular Technology Conference, Victoria, B. C, Canada, Oct. 4 – 7, 2020.

[9] A. R. Ndjiongue and T. M. N. Ngatched, “LED-based Energy harvesting for Modern Mobile Terminals” in Proc. ISNCC 2020, International Symposium on Networks, Computer and Communications, Montreal, Canada, Jun. 16 – 18, 2020.

[10] A. R. Ndjiongue and T. M. N. Ngatched, “Outage Probability of a CSK Transmission in Visible Light Communications Systems” in Proc. ISNCC 2020, International Symposium on Networks, Computer and Communications, Montreal, Canada, Oct. 20 – 22, 2020.

[11] S. B. Aboagye, A. Ibrahim, T. M. N. Ngatched, and O. A. Dobre, “VLC in Future Heterogeneous Networks: Energy- and Spectral-Efficiency Optimization” in Proc. at ICC 2020, IEEE International Conference on Communications, Dublin, Ireland, Jun. 7 – 11, 2020.


[12] M. H. A. Khoshafa, T. M. N. Ngatched, M. H. Ahmed, and A Ibrahim, “Enhancing Physical Layer Security Using Underlay Full-Duplex Relay-Aided D2D Communications,” in Proc. WCNC 2020, IEEE Wireless Communications and Networking Conference, Seoul, South Korea, Apr. 6 – 9, 2020.


[13] J. M. M. Moualeu and T. M. N. Ngatched, “Relay Selection Strategies for Physical-Layer Security in D2D-Assisted Cellular Networks,” in Proc. VTC2019-Fall, IEEE Vehicular Technology Conference, Honolulu, Hawaii, U.S.A, Sep. 22 – 25, 2019.

[14] A. R. Ndjiongue, T. M. N. Ngatched, and H. C. Ferreira, “An AF Cooperative VLC Communication Systems: Cascaded Channel Analysis,” in Proc. ICC 2019, IEEE International Conference on Communications, Shanghai, China, May 20 – 24, 2019.

[15] A. Ibrahim, T. M. N. Ngatched, and O. A. Dobre, “'Optimal Interference Management, Power Control and Routing in Multihop D2D Cellular Systems,” in Proc. WCNC 2019, IEEE Wireless Communications and Networking Conference, Marrakech, Morocco, Apr. 15-18, 2019. BEST PAPER AWARD.

[16] M. H. A. Khoshafa, T. M. N. Ngatched, and M. H. Ahmed, “On the Physical Layer Security of Underlay Multi-hop Device-to-Device Relaying,” in Proc. WCNC 2019, IEEE Wireless Communications and Networking Conference, Marrakech, Morocco, Apr. 15-18, 2019.

[17] J. M. M. Moualeu, D. B. da Costa, F. Javier Lopez-Martinez, W. Hamouda, T. M. N. Ngatched, and U. S. Dias “Secrecy Analysis of a TAS/MRC Scheme in α-µ Fading Channels,” in Proc. WCNC 2019, IEEE Wireless Communications and Networking Conference, Marrakech, Morocco, Apr. 15-18, 2019.

[18] A. Ibrahim, T. M. N. Ngatched, and O. A. Dobre, “Joint Power Control and Routing in Multihop D2D Assisted Cellular Systems,” in Proc. GLOBECOM 2018, IEEE Global Telecommunications Conference, Abu Dhabi, UAE, Dec. 9 – 13, 2018.

[19] A. R. Ndjiongue, T. M. N. Ngatched, and H. C. Ferreira, “Access Telecommunication Systems using VLC Technology. Phase I: Cascaded LD-LED Channel Analysis,” in Proc. GLOBECOM 2018, IEEE Global Telecommunications Conference, Abu Dhabi, UAE, Dec. 9 – 13, 2018.

[20] S. B. Aboagye, A. Ibrahim, and T. M. N. Ngatched “Energy Efficient Power and Flow Control in Millimeter Wave Backhaul Heterogeneous Networks,” in Proc. GLOBECOM 2018, IEEE Global Telecommunications Conference, Abu Dhabi, UAE, Dec. 9 – 13, 2018.

[21] A. Dubey, C. Kundu, T. M. N. Ngatched, O. A. Dobre, and R. K. Mallik “Incremental Selective Decode-and-Forward Relaying for Power Line Communication” in Proc. VTC2017-Fall, IEEE Vehicular Technology Conference, Toronto, ON, Canada, Sep. 24 – 27, 2017.

[22] A. R. Ndjiongue, H. C. Ferreira, and T. M. N. Ngatched “Constellation Design for Cascaded MPSK-CSK Systems” in Proc. ICC 2017, IEEE International Conference on Communications, The 3rd Workshop on Optical Wireless Communications (OWC), Paris, France, May. 21 – 25, 2017.

[23] A. Afana, T. M. N. Ngatched, O. A. Dobre, and S. S. Ikki, “Spatial Modulation in MIMO Spectrum Sharing Systems with Imperfect Channel Estimation and Primary Interference Constraint,” in Proc. WCNC 2017, IEEE Wireless Communications and Networking Conference, San Francisco, CA, USA, March 19 – 22, 2017.

[24] C. Kundu, T. M. N. Ngatched, and O. A. Dobre, “Relay Selection to Improve Secrecy in Cooperative Threshold Decode-and-Forward Relaying,” in Proc. GLOBECOM 2016, IEEE Global Telecommunications Conference, Washington, DC, USA, Dec. 4 – 8, 2016.

[25] M. Arifuzzaman, O. A. Dobre, M. H. Ahmed, and T. M. N. Ngatched, “Joint Routing and MAC Layer QoS-Aware Protocol for Wireless Sensor Networks,” in Proc. GLOBECOM 2016, IEEE Global Telecommunications Conference, Washington, DC, USA, Dec. 4 – 8, 2016.

[26] C. Kundu, T. M. N. Ngatched, and O. A. Dobre, “Secrecy Performance of Dual-hop Threshold with Diversity Reception,” in Proc. VTC2016-Fall, IEEE Vehicular Technology Conference, Montreal, QC, Canada, Sep. 18 – 21, 2016

[27] A. Afana, T. M. N. Ngatched, O. A. Dobre, and S. S. Ikki, “Spatial Modulation in MIMO Spectrum Sharing Systems with Imperfect Channel Estimation and Primary Interference Constraint,” in Proc. GLOBECOM 2015, IEEE Global Telecommunications Conference, San Diego, CA, USA, Dec. 6 – 10, 2015.

[28] A. Afana, T. M. N. Ngatched, O. A. Dobre, and S. S. Ikki, “Spatial Modulation in MIMO Spectrum Sharing Systems with Imperfect Channel Estimation and Limited Feedback in the Presence of Multiple Primary Users,” in Proc. GLOBECOM 2015, IEEE Global Telecommunications Conference, San Diego, USA, USA, Dec. 6 – 10, 2015.

[29] A. R. Ndjiongue, T. Shongwe, H. C. Ferreira, T. M. N. Ngatched, and A. J. H. Vinck, “Cascaded PLC-VLC Channels Using OFDM and CSK Techniques” in Proc. GLOBECOM 2015, IEEE Global Telecommunications Conference, San Diego, USA, USA, Dec. 6 – 10, 2015.

[30] F. Reátegui, M. Z. Shakir, M. A. Imran, R. Tafazolli, K. A. Qaraqe, and T. M. N. Ngatched, “On Bounds for the Cognitive Multiple Access Z-Interference Channel,” in Proc. the 14th Canadian Workshop on Information Theory (CWIT 2015), St. John’s, NL, Canada, Jul. 6 – 9, 2015.

[31] S. Zhalehpour, M. Uysal, O. A. Dobre, and T. M. N. Ngatched, “Outage Capacity and Throughput Analysis of Multiuser FSO Systems,” in Proc. the 14th Canadian Workshop on Information Theory (CWIT 2015), St. John’s, NL, Canada, Jul. 6 – 9, 2015.

[32] A. Afana, T. M. N. Ngatched, O. A. Dobre, and A. Ghrayeb, “Cooperative Bi-Directional DF Cognitive Radio Networks with Limited Feedback and Beamforming,” in Proc. ICC 2015, IEEE International Conference on Communications, Seventh Workshop on Cooperative and Cognitive Networks (CoCoNet7), London, UK, Jun. 8 – 12, 2015.

[33] A. Afana, S. S. Ikki, T. M. N. Ngatched, and O. A. Dobre, “Performance Analysis of Cooperative Networks with Optimum Combining and Co-channel Interference,” in Proc. ICC 2015, IEEE International Conference on Communications, Seventh Workshop on Cooperative and Cognitive Networks (CoCoNet7), London, UK, Jun. 8 – 12, 2015.

[34] M. Shaat, T. M. N. Ngatched, and O. A. Dobre “Resource Allocation in OFDM-Based Cognitive Two-Way Multiple-Relay Networks,” in Proc. GLOBECOM 2014, IEEE Global Telecommunications Conference, Austin, Texas, USA, Dec. 8 – 12, 2014.

[35] J. M. M. Moualeu, T. M. N. Ngatched, W. Hamouda, and F. Takawira “Energy-efficient Cooperative Spectrum Sensing and Transmission in Multi-channel Cognitive Radio Networks,” in Proc. ICC 2014, IEEE International Conference on Communications, Sydney, Australia, June 10 – 14, 2014.

[36] T. M. N. Ngatched, Shuo Dong, and A. S. Alfa “Analysis of Cognitive Radio Networks with Channel Assembling, Buffering, and Imperfect Sensing,” in Proc. WCNC 2013, IEEE Wireless Communications and Networking Conference, Shanghai, China, April 7 – 10, 2013.

[37] T. M. N. Ngatched, Shuo Dong, A. S. Alfa, and J. Cai “'Performance Analysis of Cognitive Radio Networks with Channel Assembling and Imperfect Sensing,” in Proc. ICC 2012, IEEE International Conference on Communications, Ottawa, Canada, June 10 – 15, 2012.

[38] T. M. N. Ngatched and A. S. Alfa, “Performance Analysis of a Cognitive Radio Network with Imperfect Sensing and a Call Level Queue for Secondary Users,” presented at CanQueue 2011, the 13-th Annual Conference for Canadian Queueing Theorists and Practitioners, August 26 – 28, 2011.

[39] T. M. N. Ngatched, A. S. Alfa, and J. Cai “Analysis of Cognitive Radio Networks with Channel Aggregation and Imperfect Sensing,” in Proc. ICCCN 2011, IEEE International Conference on Computer Communications and Networks, Workshop on Cognitive and Resource-aware Wireless Communications, Maui, Hawaii, USA, July 31 – August 4, 2011.

[40] T. M. N. Ngatched, A. S. Alfa, and J. Cai “Near Optimum Majority-Logic Based Decoding of Low-Density Parity-Check Codes,” in Proc. ICC 2011, IEEE International Conference on Communications, Kyoto, Japan, June 5 – 9 2011.

[41] T. M. N. Ngatched, A. S. Alfa, and J. Cai “An Improvement on the Soft Reliability-Based Iterative Majority-Logic Decoding Algorithm for LDPC Codes,” in Proc. GLOBECOM 2010, IEEE Global Telecommunications Conference Miami, Florida, USA, Dec. 6 – 10, 2010.

[42] T. M. N. Ngatched and A. S. Alfa, “Queuing Analysis of Opportunistic Access in Multichannel Cognitive Radios Using a Fluid Queue Model,” presented at CanQueue 2010, the 12-th Annual Conference for Canadian Queueing Theorists and Practitioners, August 26 – 28, 2010.

[43] T. M. N. Ngatched, A. S. Alfa, and J. Cai “Cooperative Sensing with Transmit Diversity Based on Randomized STBC in CR Networks,” in Proc. IWCMC 2010, 6th International Wireless Communications and Mobile Computing Conference, pp. 225-230, June 28 – July 2 2010.

[44] T. M. N. Ngatched, A. S. Alfa, and J. Cai “Efficient Implementation of Interior Point Decoding Based on Barrier Function for LDPC Codes,” in Proc. WCNC 2010, 2010 IEEE Wireless Communications and Networking Conference, pp. 1-6, 18 – 21 April 2010.

[45] T. M. N. Ngatched, A. S. Alfa, and J. Cai “Hybrid Decoding of LDPC Codes Based on Finite Geometries,” in Proc. ICC 2010, IEEE International Conference on Communications, pp. 1 – 6, 23 – 27 Jun. 2010.

[46] N. Nuwan, P. Yahampath, T. M. N. Ngatched, and Attahiru. S. Alfa “Low-Complexity Iterative Detection and Decoding in Finite Geometry LPDC-coded MIMO Systems,” in Proc. PIMRC’09, 20th Personal Indoor and Mobile Radio Communications Symposium (PIMRC’09), Sept. 13 – 16, 2009, Tokyo, Japan.

[47] T. M. N. Ngatched and A. S. Alfa, “A modified binary communication channel with memory based on a finite Queue,” presented at the 10-th Annual Conference for Canadian Queueing Theorists and Practitioners at Carleton University, August 28 – 30, 2008.

[48] T. M. N. Ngatched, F. Takawira, and M. Bossert “A Modified bit-flipping decoding algorithm for low-density parity-check codes,” in Proc. ICC 2007, IEEE International Conference on Communications, vol. 1, pp. 653-658, 24 – 28 Jun. 2007.

[49] T. M. N. Ngatched and F. Takawira, “A list decoding algorithm for short low-density parity-check codes,” in Proc. of the 4th International Symposium on Turbo codes and Related Topics to be held in Munich, Germany Apr. 3-7 2006.

[50] T. M. N. Ngatched, M. Bossert, and A. Fahrner, “Two decoding algorithms for low-density parity-check codes,” in Proc. ICC 2005, IEEE International Conference on Communications, vol. 1, pp. 673-677, 16 – 20 May 2005.

[51] T. M. N. Ngatched and F. Takawira, “A low-weight trellis based soft-input soft-output decoding algorithm for binary linear block codes with application to generalized irregular low density codes,” in Proc. 2004 GLOBECOM 2004, IEEE Global Telecommunications Conference, vol. 4, no. 1, pp. 705-710, Nov. 29 – Dec. 3, 2004

[52] T. M. N. Ngatched and F. Takawira, “Pairwise error probability on the Gilbert-Elliott channel with application to turbo codes,” in Proc. IEEE AFRICON 2004, pp. 279 – 284, Sept. 2004.

[53] T. M. N. Ngatched and F. Takawira, “An Iterative Soft-Input Soft-Output Decoding Algorithm for Linear Block Codes,” in Proc. South African Telecommunication Networks & Applications Conference (SATNAC), Spier Wine Estate, Western Cape, South Africa, 6 – 8 Sept. 2004.

[54] T. M. N. Ngatched and F. Takawira, “Error-Correcting Codes Based on Irregular Graphs,” in Proc. South African Telecommunication Networks & Applications Conference, 8 – 10 Sept. 2003, George, South Africa.

[55] T. M. N. Ngatched and F. Takawira, “Efficient Decoding of Generalized Low-Density Parity-Check Codes Based on Long Component codes,” in Proc. WCNC 2003, 2003 IEEE Wireless Communications and Networking Conference, vol. 4, no. 1, pp. 705 – 710, Mar. 2003.

[56] T. M. N. Ngatched and F. Takawira, “Generalized Irregular low-Density (Tanner) Codes based on Hamming Component Codes,” in Proc. AFRICON 2002, October 2002, pp. 193 – 196.

[57] T. M. N. Ngatched and F. Takawira, “Decoding of GLD Codes in a Rayleigh Fading Channel With Imperfect Channel Estimates,” in Proc. South African Telecommunication Networks & Applications Conference, 1 – 4 Sept. 2002, Drakensberg, South Africa.

[58] T. M. N. Ngatched and F. Takawira, “Comparison of stopping criteria for turbo decoding,” in Proc. South African Telecommunication Networks & Applications Conference, 2 – 5 Sept. 2001, Wild Coast Sun, South Africa.

[59] T. M. N. Ngatched and F. Takawira, “Effect of mobile Doppler frequency on the performance of coherent turbo-coded DS-CDMA over frequency selective multi-path Rayleigh fading channel,” in Proc. South African Telecommunication Networks & Applications Conference, 10 – 13 Sept. 2000, Cape Town, South Africa.