Design of equalizers for frequency selective MIMO systems with low redundancy
140 viewsDOI:
https://doi.org/10.54939/1859-1043.j.mst.91.2023.20-27Keywords:
MIMO; IBI; Frequency selective; Broadband; Decision-feedback equalizer.Abstract
In this paper, we propose several designs of filter bank based decision feedback equalizers (DFE) for frequency selective multi-input multi-output (MIMO) systems. Transmission schemes over frequency selective channels are typically block based, and redundancy in form of guard intervals must be used to avoid inter-block interference (IBI). This paper will focus on the case where spectral efficiency demands low levels of redundancy. Then the remaining IBI will be eliminated by a separate feedback loop. The co-channel interference (CCI) inherited in MIMO channels will be eliminated by different DFE schemes. In another approach, a multi-tap MIMO DFE will be designed to deal with both IBI and CCI. The simulation results show that for quasi-static frequency selective MIMO channels, the multi-tap DFE provides the best performance while for Raleigh frequency selective MIMO channels, the dual loop DFE is a good solution for transmission with low redundancy.
References
[1]. A. J. Paulraj, D. A. Gore, R. U. Nabar and H. Bolcskei, "An overview of MIMO communications - a key to gigabit wireless," Proceedings of the IEEE, Vol. 92, No. 2 (2004), pp. 198-218, (2004). DOI: https://doi.org/10.1109/JPROC.2003.821915
[2]. A. Farhang, N. Marchetti, F. Figueiredo and J. P. Miranda, "Massive MIMO and waveform design for 5th generation wireless communication systems," Proc. of 1st International Conference on 5G for Ubiquitous Connectivity, Akaslompolo, Finland, pp. 70-75, (2014). DOI: https://doi.org/10.4108/icst.5gu.2014.258195
[3]. Zhendao Wang and G. B. Giannakis, "Wireless multicarrier communications," IEEE Signal Processing Magazine, Vol. 17, No. 3, pp. 29-48, (2000). DOI: https://doi.org/10.1109/79.841722
[4]. N. Al-Dhahir, "FIR channel-shortening equalizers for MIMO ISI channels," IEEE Transactions on Communications, Vol. 49, No. 2, pp. 213-218, (2001). DOI: https://doi.org/10.1109/26.905867
[5]. C. Toker, S. Lambotharan and J. A. Chambers, "Joint Transceiver Design for MIMO Channel Shortening," IEEE Transactions on Signal Processing, Vol. 55, No. 7, pp. 3851-3866, (2007). DOI: https://doi.org/10.1109/TSP.2007.894231
[6]. F. Rusek and A. Prlja, "Optimal Channel Shortening for MIMO and ISI Channels," IEEE Transactions on Wireless Communications, Vol. 11, No. 2, pp. 810-818, (2012). DOI: https://doi.org/10.1109/TWC.2011.121911.110809
[7]. Li Youming, "Maximum shortening SNR design for MIMO channels," Proc. Of IEEE International Symposium on Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications, Beijing, China, pp. 1488-1491, (2005).
[8]. M. Joham, D. A. Schmidt, J. Brehmer and W. Utschick, "Finite-Length MMSE Tomlinson–Harashima Precoding for Frequency Selective Vector Channels," IEEE Transactions on Signal Processing, Vol. 55, No. 6, pp. 3073-3088, (2007). DOI: https://doi.org/10.1109/TSP.2007.893954
[9]. A. Stamoulis, G. B. Giannakis and A. Scaglione, "Block FIR decision-feedback equalizers for filterbank precoded transmissions with blind channel estimation capabilities," IEEE Transactions on Communications, Vol. 49, No. 1, pp. 69-83, (2001). DOI: https://doi.org/10.1109/26.898252
[10]. K. Kusume, M. Joham and W. Utschick, "MMSE block decision-feedback equalizer for spatial multiplexing with reduced complexity," Proc. of IEEE Global Telecommunications Conference, 2004. GLOBECOM '04., Dallas, TX, USA, pp. 2540-2544 Vol.4, (2004).
[11]. H. Sampath, P. Stoica and A. Paulraj, "Generalized linear precoder and decoder design for MIMO channels using the weighted MMSE criterion," IEEE Transactions on Communications, Vol. 49, No. 12, pp. 2198-2206, (2001). DOI: https://doi.org/10.1109/26.974266
