Research Activities

Channel coding and adaptive transmission techniques

Definition and evaluation of coding and adaptive transmission techniques, to improve efficiency and ensure a given Quality of Service level, in telecommunication systems that use communication channels with time varying characteristics [1-9,21-24, 26, 38, 39, 41, 43, 46, 54-56, 58-59, 64-65, 69, 74-75].

Multiple access techniques for personal communications

Definition and evaluation of multiple access protocols for multimedia information [10-12, 36, 37, 45, 48, 51, 60, 67-68, 70, 72].

Time varying radio channel models

Radio channel characterization and development of tools and verification techniques to model radio channel parameter evolution with a Markov chain of unspecified order [13-19].

Real time information transmission over heterogeneous networks

Definition and evaluation of priority based algorithms for audio (M-PEG 4) and video (H.263+) and video information transmission over best effort networks [20, 28, 29, 50, 52].

Antenna systems

Characterization, design, optimization of antenna systems for heterogeneous networks, 5G networks, and millimeter wave communication. [25, 27, 30-35, 42, 49, 57, 61-63, 66, 71, 73].

Simulation tools

Development of simulation platforms for directional antenna systems for heterogeneous networks. [40, 44].

Positioning

Time of arrival estimation of LTE signals for positioning applications. [47, 53, 76].

Selected publications

Channel coding and adaptive transmission techniques

[1] F. Babich, F. Vatta, "Coding and Networking Techniques for Radio Networks", Sixth Winlab Workshop on Third Generation Wireless Information Networks, New Brunswick, NJ, March 20-21 1997. Also published in "Advances in Wireless Communications" J.M. Holtzman, M. Zorzi Eds, Kluwer Academic Publishers, 1998.

[2] F. Babich, G. Montorsi, F.Vatta, "Performance bounds of continuous and blockwise decoded turbo codes in Rician fading channels", IEE Elec. Lett., Vol. 34, no. 17, pp.1646-1648, Aug. 1998.

[3] F. Babich, G. Montorsi, F.Vatta, "Transfer function bounds on turbo codes performance in the Rician fading channel", ICC '99, June 1999.

[4] F. Babich, F.Vatta, "A Multimode and Variable-Rate Voice Communications System with Source-Matched Error Protection for Mobile Communications", European Transactions on Telecommunications, vol. 10 n. 5 September/October 1999, pp 523-536.

[5] F. Babich, F. Babich, "Considerations on adaptive techniques for Time Division Multiplexing Radio Systems", IEEE Transactions on Vehicular Technology, vol. 48 n. 6, November 1999, pp.1862-1873.

[6] F. Babich, G. Montorsi, F. Vatta, “ Improved union bounds on turbo codes performance”, IEE Proceedings, Vol. 147, no. 6, December 2000, pp. 337-344.

[7] F. Babich, “Performance of hybrid ARQ schemes for the fading channel”, IEEE Trans. on Communications, Vol. 50, no 12, December 2002, pp. 1882-1885.

[8] F. Babich, G. Montorsi, F. Vatta, “Achievable Performance of Turbo Codes over the Correlated Rician Channel", IEEE Trans. on Communications, Vol. 51, Issue 1, Jan. 2003, pp. 1-4.

[9] F. Babich, E. Valentinuzzi, F. Vatta, “Performance of hybrid ARQ schemes for the mobile LEO satellite channel”, Wireless Personal Communications, special issue on "Broadband Mobile Terrestrial-Satellite Integrated Systems", vol. 24(2), February 2003, pp. 275-289.

[21] F. Babich, “On the Performance of efficient coding techniques Over Fading Channels”, IEEE Trans. on Wireless Communications, Vol. 3, no 1, January 2004, pp. 290-299.

[22] F. Babich, G. Montorsi, F. Vatta, "Partially systematic rate-compatible punctured SCCCs", IEEE Communications Letters, Vol. 8, Issue 4, Apr. 2004 , pp. 241-243.

[23] F. Babich, G. Montorsi, F. Vatta, "Some notes on rate-compatible punctured turbo codes (RCPTC) design'', IEEE Transactions on Communications, Vol. 52, Issue 5 , May 2004, pp. 681-684.

[24] F. Babich, G. Montorsi, F. Vatta, “On rate-compatible punctured turbo codes design", EURASIP Journal on Applied Signal Processing 2005 (6), May 2005, pp. 784-794.

[26] F. Babich, G. Montorsi, F. Vatta, “Turbo codes performance optimization over block fading channels", Journal of Communications Software and Systems (JCOMSS), Vol. 2, N. 3, September 2006, pp. 228-234.

[38] F. Babich, A. Crismani, R.G. Maunder, “EXIT chart aided design of periodically punctured turbo codes”, Electronics Letters, vol. 2010, p. 1001-1003.

[39] F. Babich, F. Vatta, "Turbo Codes Construction for Robust Hybrid Multitransmission Schemes", Journal of Communication Software and Systems, vol. 7, p. 128-135, 2011.

[41] F. Babich, A. Crismani, M. Driusso, L. Hanzo, "Design Criteria and Genetic Algorithm Aided Optimisation of Three-Stage-Concatenated Space-Time Shift Keying Systems" IEEE Signal Processing Letters, vol. 19, p. 543-546, 2012.

[43] F. Babich, A. Crismani, "Cooperative Coding Schemes: Design and Performance Evaluation. IEEE Transactions on Wireless Communications, vol. 11, p. 222-235, 2012.

[46] F. Babich, M. Comisso, A. Crismani. "Considerations on the multiplexing and diversity tradeoff in IEEE 802.11 networks". IET Communications, vol. 8, p. 1551-1559, 2014.

[54] F. Babich, Soranzo A., F. Vatta. “Useful Mathematical Tools for Capacity Approaching Codes Design”. IEEE Communications Letters, vol. 21, p. 1949-1952, 2017.

[55] F. Vatta, A. Soranzo, F. Babich, “Low-complexity bound on irregular LDPC belief-propagation decoding thresholds using a Gaussian approximation” Electronics Letters, Vol. 54, No.17, 2018, pp. 1038-1040

[56] F. Babich, M. Noschese, A. Soranzo, F. Vatta, “Low complexity rate compatible puncturing patterns design for LDPC codes”, Journal of Communications Software and Systems, Vol. 14, No.4, pp. 350-358, 2018.

[58] F. Babich, F. Vatta, “On the error statistics of turbo decoding for hybrid concatenated codes design” Journal of Communications Software and Systems, Vol. 15, No.2, pp. 202-212, 2019

[59] F. Vatta, A. Soranzo, F. Babich, “More Accurate Analysis of Sum-Product Decoding of LDPC Codes Using a Gaussian Approximation”, IEEE Communications Letters, Vol. 23, No. 2, pp. 230-233, 2019.

[64] F. Vatta, F. Babich, F. Ellero, M. Noschese, G. Buttazzoni, M. Comisso, "Role of the product λ'(0)ρ'(1) in determining ldpc code performance", Electronics (Switzerland), Vol. 8, No. 12, 2019.

[65] F. Vatta, A. Soranzo, M. Comisso, G. Buttazzoni, F. Babich, "New explicitly invertible approximation of the function involved in LDPC codes density evolution analysis using a Gaussian approximation", Electronics Letters, Vol. 55, N. 22, October 2019, pp. 1183-1186.

[69] C. Travan, F. Vatta, F. Babich, "Recent results on the implementation of a burst error and burst erasure channel emulator using an FPGA architecture", Journal of Communications Software, Vol. 16, N. 1, March 2020, pp. 19-29.

[74] F. Vatta, A. Soranzo, M. Comisso, G. Buttazzoni, F. Babich, "Performance Study of a Class of Irregular Near Capacity Achieving LDPC Codes", Journal of Communications Software, Vol. 17, N. 1, March 2021, pp. 59-65.

[75] F. Vatta, A. Soranzo, M. Comisso, G. Buttazzoni, F. Babich, "A Survey on Old and New Approximations to the Function Φ(x) Involved in LDPC Codes Density Evolution Analysis Using a Gaussian Approximation", Information Vol. 12, No.5, 2021

Multiple access techniques for personal communications

[10] F. Babich, "Analysis of a Contention Resolution Multiple Access Algorithm for Handling Mixed Traffic on Wireless Networks", Int. Journal of Wireless Information Networks, Vol. 1, No. 4, pp. 271-287, 1994.

[11] F. Babich, "Analysis of Frame Based Reservation Random Access Protocols for Microcellular Radio Networks", IEEE Transactions on Vehicular Technology, vol. 46, No.2, May 1997, pp. 408-421.

[12] F. Babich, ''Free Access Stack Algorithms for Microcellular Radio Systems '', IEEE Transactions on Vehicular Technology, Vol. 48, No. 2, pp. 363-375, March 1999.

[36] F. Babich and M. Comisso, “Theoretical Analysis of Asynchronous Multi-Packet Reception in 802.11 Networks”, IEEE Transactions on Communications, vol. 58, No. 6, pp. 1782-1794, June 2010.

[37] F. Babich, M. Comisso, “On the use of a nonuniform backoff in 802.11 networks”, Electronics Letters, vol. 2010, p. 1468-1470.

[45] F. Babich, M. Comisso. “Multi-Packet Communication in Heterogeneous Wireless Networks Adopting Spatial Reuse: Capture Analysis”. IEEE Trans. on Wireless Communication, vol. 12, p. 5346-5359, 2013.

[48] Babich F., Comisso M., Crismani A., Dorni A. "On the Design of MAC Protocols for Multi-Packet Communication in IEEE 802.11 Heterogeneous Networks Using Adaptive Antenna Arrays". IEEE Transactions on Mobile Computing, vol. 14, p. 2332-2348, 2015.

[51] F. Babich, M. Comisso. "Including the Angular Domain in the Analysis of Finite Multi-Packet Peer-to-Peer Networks with Uniformly Distributed Sources". IEEE Transactions on Communications, vol. 64, p. 2494-2510, 2016.

[60] F. Babich, M. Comisso. “Impact of Segmentation and Capture on Slotted Aloha Systems Exploiting Interference Cancellation”. IEEE Transactions on Vehicular Technology, Vol. 68, No. 3, March 2019, pp. 3613-3627.

[67] F. Babich, M. Comisso, A. Cuttin, F. Ricciato, "Exploiting capture and interference cancellation for uplink random multiple access in 5G millimeter-wave networks", Annales des Telecommunications/Annals of Telecommunications, Vol. 75, N. 1-2, February 2020,

[68] F. Babich, M. Comisso, A. Cuttin, M. Marchese, and F. Patrone, "Nanosatellite-5G Integration in the Millimeter Wave Domain: A Full Top-Down Approach",IEEE Transactions on Mobile Computing, Vol. 19, N. 2, February 2020, pp. 390-404.

[70] F. Babich, G. Buttazzoni, F. Vatta, M. Comisso, "Energy-constrained uncoordinated multiple access for next-generation networks", IEEE Open Journal of the Communications Society, Vol 1, 2020, pp. 1808-1819.

[72] F. Babich, G. Buttazzoni, F. Vatta, M. Comisso, "Energy-Constrained Design of Joint NOMA-Diversity Schemes with Imperfect Interference Cancellation", Sensors, Vol. 21, No. 12, 2021.

Time varying radio channel models

[13] F. Babich, O. E. Kelly, G. Lombardi, "A Variable Order Discrete Model for the Fading Channel", 9th Tyrrhenian International Workshop on Digital Communications, Lerici, Italy, September 7-10, 1997. Also published in "Broadband Wireless Communications" M. Luise and S. Pupolin Eds, Springer-Verlag, 1998

[14] F. Babich, G. Lombardi, "A General Nakagami Approximation for the Sum of Ricean Interferers", IEE Elec. Lett., Vol. 34, no. 1, pp. 23-24, Jan. 1998.

[15] F. Babich, O. E. Kelly, G. Lombardi, "A Context-Tree Based Model for Quantized Fading", IEEE Communications Letters, Vol. 3, No. 2, pp. 46-48, February 1999.

[16] F. Babich, G. Lombardi, E.Valentinuzzi," Variable order Markov modeling for LEO mobile satellite channels", IEE Elec. Lett., Vol. 35, no. 8, 15 Apr. 1999.

[17] F. Babich, G. Lombardi, "A Markov Model for the Mobile Propagation Channel", IEEE Trans. on Vehicular Technology,  F. Babich, G. Lombardi, "A Markov Model for the Mobile Propagation Channel", IEEE Trans. on Vehicular Technology,  vol. 49, no. 1, January 2000, pp. 63-73.

[18] F. Babich, G. Lombardi, "Statistical Analysis and Characterization of the Indoor Propagation Channel", IEEE Trans. on Communications,  vol. 48, no. 3, March 2000, pp. 455-464.

[19] F. Babich, O.E. Kelly, G. Lombardi, "Generalized Markov Modeling for Flat Fading", IEEE Trans. on Communications,  vol. 48, no. 4, April 2000, pp. 547-551.

Real time information transmission over heterogeneous networks

[20] Fulvio Babich, Marko Vitez, "A Novel Wide-Band Audio Transmission Scheme over the Internet with a Smooth Quality Degradation", ACM SIGCOMM Computer Communication Review Volume 30, Number 1, January 2000.

[28] F. Babich, M. D'Orlando, F. Vatta, "Video quality estimation in wireless IP networks: Algorithms and applications", ACM Transactions on Multimedia Computing, Communications, and Applications (TOMCCAP), Vol. 4, Issue 1 , January 2008, pp. 1344-1453.

[29] F. Babich, D.R. Bull, J. Cai,"Wireless video", Eurasip Journal on Advances in Signal Processing, 2008, pp. 1-2.

[50] F. Babich, M. Comisso, Corrado Riccardo, Merazka, Fatiha. "Joint Voice/Video Retry Limit Adaptation for On-Demand Streaming over WiFi Networks". IEEE Communications Letters, vol. 20, p. 1852-1855, 2016.

[52] F. Babich, M. Comisso, R. Corrado, "Fast retry limit adaptation for video distortion/delay control in IEEE 802.11 e distributed networks" Ad Hoc Networks Vol. 36, 229-243, 2016.

Antenna systems

[25] F. Babich, M. Comisso, M. D'Orlando, L. Manià, "Interference Mitigation on WLANs Using Smart Antennas", Wireless Personal Communications Journal (WPC), vol. 36, no. 4, 2006, pp. 387-401.

[27] F. Babich, M. Comisso, M. D'Orlando, L. Manià, "Performance evaluation of Distributed Wireless Networks Using Smart Antennas in Low-Rank Channel", IEEE Trans. on Communications, Vol. 55, Issue 7 , July 2007, pp. 1344-1453.

[30] F. Babich, M. Comisso, “Optimum Contention Window for 802.11 Networks Adopting Directional Communications”, Electronics Letters, Vol. 44, No. 16, pp. 994 - 995, 31st July. 2008.

[31] F. Babich, M. Comisso, "Throughput and delay analysis of 802.11-based wireless networks using smart and directional antennas" IEEE Trans. on Communications, Vol. 57, No. 5, pp. 1413 - 1423, May 2009.

[32] F. Babich, M. Comisso, “Optimum Contention Window for 802.11 Networks Adopting Directional Communications”, Electronics Letters, Vol. 44, No. 16, pp. 994 - 995, 31st July. 2008.

[33] F. Babich, M. Comisso, "Throughput and delay analysis of 802.11-based wireless networks using smart and directional antennas" IEEE Trans. on Communications, Vol. 57, No. 5, pp. 1413 - 1423, May 2009.

[34] F. Babich, M. Comisso, L. Manià, "Performance Comparison of Advanced Antenna Systems for Wireless Mesh Routers in an Outdoor Environment", International Journal of Pervasive Computing and Communications, Vol. 5, No. 3, pp. 249 - 271, May 2009.

[35] F. Babich, M. Comisso, L. Manià, "Sustainable Simultaneous Communications in Ad-Hoc Networks Using Smart Antenna Systems" ACM Wireless Networks, Vol. 15, No. 8, pp. 1074 - 1085, Nov. 2009.

[42] F. Babich, M. Comisso, E. Valentinuzzi, A. Dorni, A. Suriano, M. Davanzo, "Numerical and experimental characterization of antenna positioning in a dual-radio mesh router", AEÜ. International Journal of Electronics and Communications, vol. 66, p. 255-261, 2012.

[49] Babich Fulvio, Comisso Massimiliano. "A Reliable Approach for Modeling the Actual Antenna Pattern in Millimeter-Wave Communication". IEEE Communications Letters, vol. 19, p. 1335-1338, 2015.

[57] G. Buttazzoni, F. Babich, F. Vatta, M. Comisso, “Low-complexity phase-only scanning by aperiodic antenna arrays”, IEEE Antennas and Wireless Propagation Letters, Vol. 18, No. 5, pp. 966-970, 2019.

[61] M. Comisso, G. Palese, F. Babich, F. Vatta, G. Buttazzoni, “3D multi-beam and null synthesis by phase-only control for 5G antenna arrays”, Electronics (Switzerland), Vol. 8, No.6, 2019.

[62] M. Comisso, F. Vatta, G. Buttazzoni, F. Babich, “3D Millimeter-Wave Peer-to-Peer Networks With Boundary Located Destination”, IEEE Communications Letters, Vol. 23, No. 7, pp. 1227-1230, 2019.

[63] M. Comisso, F. Babich. “Coverage Analysis for 2D/3D Millimeter Wave Peer-to-Peer Networks”. IEEE Transactions on Wireless Communications, vol. 18, No. 7, July 2019, pp. 3613-3627.

[66] G. Buttazzoni, F. Babich, F. Vatta, M. Comisso, "Geometrical synthesis of sparse antenna arrays using compressive sensing for 5G IoT applications", Sensors (Switzerland), Vol. 20, No. 2, January 2020.

[71] G. Buttazzoni, F. Babich, S. Pastore, F. Vatta, M. Comisso, "Gaussian Approach for the Synthesis of Periodic and Aperiodic Antenna Arrays: Method Review and Design Guidelines", Sensors, Vol. 21, No. 7, 2021.

[73]

M. Comisso, F. Vatta, G. Buttazzoni, F. Babich, "Limiting Performance of Millimeter-Wave Communications in the Presence of a 3D Random Waypoint Mobility Model", Journal of Communications Software, Vol. 17, N. 1, March 2021, pp. 44-49.

Simulation tools

[40] F. Babich, M. Comisso, A. Dorni, F. Barisi, M. Driusso, A. Manià, "Discrete-time simulation of smart antenna systems in Network Simulator-2 Using MATLAB and Octave", SIMULATION, vol. 87, p. 932-946, 2011.

[44] Babich F., Comisso M., D'Orlando M., Dorni A., "Deployment of a Reliable 802.11e Experimental Setup for Throughput Measurements", Wireless Communications and Mobile Computing, vol. 12, p. 910-923, 2012.

Positioning

[47] Driusso Marco, Comisso Massimiliano, Babich Fulvio, Marshall Chris. "Performance analysis of time of arrival estimation on OFDM signals". IEEE Signal Processing Letters, vol. 22, p. 983-987, 2015.

[53] M. Driusso, C. Marshall, M. Sabathy, F. Knutti, H. Mathis, F. Babich. “Vehicular Position Tracking Using LTE Signals”. IEEE Transactions on Vehicular Technology, vol. 66, No. 4, April 2017, pp. 3376-3391.

[76] M. Noschese, F. Babich, M. Comisso, C. Marshall, "Multi-Band Time of Arrival Estimation for Long Term Evolution (LTE) Signals",IEEE Transactions on Mobile Computing, Vol. 20, N. 12, December 2021, pp. 3383-3394.