Channel Equalization in FBMC

This repository simulates an FBMC transmission over a doubly-selective channel and shows the Bit Error Ratio (BER) for different MMSE equalization and interference cancellation methods. All figures from R. Nissel et al. “FBMC-OQAM in Doubly-Selective Channels: A New Perspective on MMSE Equalization”, IEEE SPAWC, 2017, can be reproduced.

For more information about FBMC, see https://github.com/rnissel/FBMC. Note that my measurements indicate that one-tap equalizers are often sufficient in mobile communications, see my PhD thesis (perfectly time and frequency synchronized). Only in some rare cases, enhanced equalization methods, as presented here, might be useful.

Requirements

We used Windows 7 (64bit) and Matlab R2013b/2016a, but newer versions (and some older) should also work.

Basic Properties of Our Equalizers

Our n-tap MMSE equalizer additionally employs neighboring subcarriers so that it outperforms conventional methods:

A simple interference cancellation scheme shows a good performance for practical relevant SNR ranges:

Reproducible Figures

All figures from “FBMC-OQAM in Doubly-Selective Channels: A New Perspective on MMSE Equalization” can be reproduced. The figure numbers are the same as in the paper.

• Figure 1: Please run PlotInterferencePower2D.m after uncommenting line 26.

• Figure 2: Please run PlotInterferencePower2D.m.

• Figure 3: Just an illustration.

• Figure 4: Please run BER_SISO.m after uncommenting line 34. Moreover, to truly reproduce Figure 4, line 31 must be uncommented (increases the simulation time).

• Figure 5: Please run BER_SISO.m. To truly reproduce Figure 5, line 31 must be uncommented (increases the simulation time).

• Figure 6: Please run BER_SISO.m. To truly reproduce Figure 6, line 31 must be uncommented (increases the simulation time).

• Figure 7: Please run BER_MIMO.m. To truly reproduce Figure 7, the lines 31-32 must be uncommented (increases the simulation time).

Please Cite Our Paper

@inproceedings{Nissel2017spawcA,
	author    = {R. Nissel and M. Rupp and R. Marsalek},
	booktitle = {IEEE International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)},
	title     = {{FBMC-OQAM} in doubly-selective channels: A new perspective on {MMSE} equalization},
	year 	  = {2017},
	pages 	  = {1-5}, 
	doi 	  = {10.1109/SPAWC.2017.8227806},
	month 	  = {July},
}

References

• R. Nissel, M. Rupp, and R. Marsalek, “FBMC-OQAM in Doubly-Selective Channels: A New Perspective on MMSE Equalization”, IEEE International Workshop on Signal Processing Advances in Wireless Communications (SPAWC), Sapporo, Japan, July 2017.
• R. Nissel, S. Schwarz, and M. Rupp, “Filter bank multicarrier modulation schemes for future mobile communications”, IEEE Journal on Selected Areas in Communications, vol. 35, no. 8, pp. 1768–1782, 2017.
• R. Nissel, “Filter bank multicarrier modulation for future wireless systems”, Dissertation, TU Wien, 2017.