Research Articles

Channel and delay estimation for base-station–based cooperative communications in frequency-selective fading channels

Hongjun Xu, Laneil Padayachee
South African Journal of Science | Vol 107, No 7/8 | a414 | DOI: https://doi.org/10.4102/sajs.v107i7/8.414 | © 2011 Hongjun Xu, Laneil Padayachee | This work is licensed under CC Attribution 4.0
Submitted: 23 August 2010 | Published: 13 July 2011

About the author(s)

Hongjun Xu, School of Electrical, Electronic and Computer Engineering, University of KwaZulu-Natal, South Africa
Laneil Padayachee, School of Electrical, Electronic and Computer Engineering, University of KwaZulu-Natal, South Africa

Abstract

A channel and delay estimation algorithm for both positive and negative delay, based on the distributed Alamouti scheme, has been recently discussed for base-station–based asynchronous cooperative systems in frequency-flat fading channels. This paper extends the algorithm, the maximum likelihood estimator, to work in frequency-selective fading channels. The minimum mean square error (MMSE) performance of channel estimation for both packet schemes and normal schemes is discussed in this paper. The symbol error rate (SER) performance of equalisation and detection for both time-reversal space-time block code (STBC) and single-carrier STBC is also discussed in this paper. The MMSE simulation results demonstrated the superior performance of the packet scheme over the normal scheme with an improvement in performance of up to 6 dB when feedback was used in the frequency-selective channel at a MSE of 3 x 10–2. The SER simulation results showed that, although both the normal and packet schemes achieved similar diversity orders, the packet scheme demonstrated a 1 dB coding gain over the normal scheme at a SER of 10–5. Finally, the SER simulations showed that the frequency-selective fading system outperformed the frequency-flat fading system.

Keywords

electronic patient records; digital watermarking; steganography; mobile devices; security; health care

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References


Laneman JN, Wornell GW. Distributed space-time coded protocols for exploiting cooperative diversity in wireless networks. IEEE Trans Inf Theory. 2003;49(10):2415–2425. doi:10.1109/TIT.2003.817829

Wang D, Fu SL. Asynchronous cooperative communications with STBC coded single carrier block transmission. Paper presented at: IEEE International Conference on Global Communications 2007. Proceedings of IEEE International Conference on Global Communications; 2007 Nov 26–30; Washington DC, USA. Washington DC: IEEE Communication Society; 2007. p. 2987–2991.

Li X. Space-time coded multi-transmission among distributed transmitters without perfect synchronisation. IEEE Signal Process Lett. 2004;11(12):948–951. doi:10.1109/LSP.2004.838213

Wei S, Goeckel DL, Valenti MC. Asynchronous cooperative diversity. IEEE Trans Wireless Commun. 2006;5(6):1547–1557. doi:10.1109/TWC.2006.1638675

Li Z, Xia XG. A simple Alamouti space-time transmission scheme for asynchronous cooperative systems. IEEE Signal Process Lett. 2007;14(11):803–807. doi:10.1109/LSP.2007.900224

Skjevling H, Gesbert D, Hjørungnes A. Precoded distributed space-time block codes in cooperative diversity-based downlink. IEEE Trans Wireless Commun. 2007;6(12):4209–4214. doi:10.1109/TWC.2007.051008

Tourki K, Deneire L. Channel and delay estimation algorithm for asynchronous cooperative diversity. Wireless Pers Commun. 2006;37:361–369. doi:10.1007/s11277-006-9033-x

Xu H, Padayachee L. Channel and delay estimation for base-station–based cooperative communications in frequency flat-fading channels. S Afr J Sci. 2010;106(3/4):32–37. doi:10.4102/sajs.v106i3/4.60

Mheidat H, Uysal M, Al-Dhahir N. Equalization techniques for distributed space-time block codes with amplify-and-forward relaying. IEEE Trans Wireless Commun. 2007;55(5):1839–1852.

Simeone O, Spagnolini U. Lower bound on training-based channel estimation error for frequency-selective block-fading Rayleigh MIMO channels. IEEE Trans Signal Processing. 2004;52(11):3265–3277. doi:10.1109/TSP.2004.836534

Sirbu M. Channel and delay estimation algorithms for wireless communication systems. PhD thesis, Helsinki, Helsinki University of Technology, 2003.

Li. Z, Xia XG, Lee MH. A simple orthogonal space-time coding scheme for asynchronous cooperative systems for frequency selective fading channels. IEEE Trans Commun. 2010;58(8):2219–2224. doi:10.1109/TCOMM.2010.08.090226

Dong M, Tong L. Optimal design and placement of pilot symbols for channel estimation. IEEE Trans Signal Processing. 2002;50(12):3055–3069. doi:10.1109/TSP.2002.805504

Zhou S, Giannakis GB. Single-carrier space-time block-coded transmissions over frequency-selective fading channels. IEEE Trans Inf Theory. 2003;49(1):164–178. doi:10.1109/TIT.2002.806158

Mheidat H. Channel estimation and equalization for cooperative communication. PhD thesis, Ontario, University of Waterloo, 2006.

Mheidat H, Uysal M. Equalization techniques for space-time coded cooperative systems. Paper presented at: IEEE 60th Vehicular Technology Conference 2004. Proceedings of IEEE 60th Vehicular Technology Conference; 2004 Sep 26–29; Los Angeles, California, USA. New York: IEEE Communications Society; 2004. p. 1708–1712.

Berriche L, Abed-Meraim K, Belfiore JC. Cramér-Rao bounds for MIMO channel estimation. Paper presented at: IEEE International Conference on Acoustics, Speech, and Signal Processing 2004. Proceedings of IEEE International Conference on Acoustics, Speech, and Signal Processing; 2004 May 17–21; Montreal, Canada. New York: IEEE Signal Processing Society; 2004. p. 397–400.

Fragouli C, Al-Dhahir N, Turin W. Training-based channel estimation for multiple-antenna broadband transmissions. IEEE Trans Wireless Commun. 2003;2(2):384–391. doi:10.1109/TWC.2003.809454



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