Filter bank modulation schemes for transmission over wide band channels are becoming more and more relevant for future wireless and wireline communication systems.
The most popular technique is OFDM. Current research is focusing on flexible and efficient filter bank architectures that provide better sub-channel spectral containment which translates into improved spectrum management characteristics and higher spectral efficiency in severe propagation conditions (high frequency selectivity, time selectivity, non ideal time/frequency synchronization, narrow band interference, phase noise, amplifier non-linearity etc.).
However, performance gains don’t come for free but may introduce increased implementation complexity. In other words, OFDM has its limitations but it is an elegant and simple solution. This is why it is important to devise performance and complexity efficient solutions.
“In our lab we are developing novel breakthrough filter bank technologies that capture the best characteristics of the known filter bank solutions but in a radical new architectural philosophy. They exhibit high performance in nasty channels, yet requiring an efficiently low complexity implementation,” Tonello says. “We have been among the first to propose the use of cyclic filter banks, and we have conceived a novel scheme called Cyclic Block FMT,” he adds.
Targeted applications are wireless (e.g. 5G), wireline and power line communications. Examples of the proposed solutions are the DFT filter bank implementation of FMT, concatenated OFDM-FMT, Wavelet OFDM, Hybrid Filter Bank Modulation, and Cyclic Filter Bank Modulation. A number of milestone contributions have been made (see publications):
- Analysis of OFDMA in wireless uplink channels
- Multiuser filter bank systems
- Optimal and suboptimal detection/decoding in multiuser filter bank schemes
- Analysis and design of FMT in double selective fading channels
- Efficient implementation architectures of FMT
- Multiantenna FMT and OFDM
- Concatenated OFDM and FMT scheme
- Synchronization, channel estimation, and equalization in FMT systems
- Orthogonal FMT design
- Wavelet OFDM
- Application of FMT in power line communications
- Precoded polynomial SVD filter banks
- Adaptive OFDM and FMT
- Hybrid OFDM and filter bank modulation
- Cyclic block FMT
M. Girotto, A. M. Tonello: Orthogonal Design of Cyclic Block Filtered Multitone Modulation, IEEE Trans. on Communications, 2016.
A. M. Tonello, M. Girotto: Cyclic Block Filtered Multitone Modulation, EURASIP Journal on Advances in Signal Processing, 2014.
N. Moret, A. M. Tonello: Design of Orthogonal Filtered Multitone Modulation Systems and Comparison among Efficient Realizations, EURASIP Journal on Advances in Signal Processing, Special issue: Filter Banks for Next Generation Wireless Multicarrier Systems, 2010.
A. M. Tonello, F. Pecile: Efficient Architectures for Multiuser FMT Systems and Application to Power Line Communications, IEEE Trans. on Communications, 2009.
A. M. Tonello, “Method and apparatus for filtered multitone modulation using circular convolution,” UD2008A000099, PCT WO2009135886A1, 2008.
A. M. Tonello: A Concatenated Multitone Multiple Antenna Air-interface for the Asynchronous Multiple Access Channel, IEEE Journal on Selected Areas of Communications (JSAC), special issue on 4G systems, 2006.
A. M. Tonello: Performance Limits for Filtered Multitone Modulation in Fading Channels, IEEE Trans. on Wireless Communications, 2005.