Efficient Signal Detection Methods for High Mobility OFDM System with Transmit Diversity
In this paper, we propose two efficient signal detection methods for high mobility space–time block code based orthogonal frequency division multiplexing (OFDM). The first proposed method is based on order block decision feedback equalizer (OBDFE) which is the column norm ordering version of the conventional BDFE method. To improve the system performance further, we have proposed a hybrid OBDFE–MPD method by cascading the OBDFE method with a multistage parallel decoder (MPD). The advantage of the OBDFE–MPD method is that it does not need additional complexity as most of the computations are performed in the initial stage by the OBDFE method. These two proposed methods are compared with minimum mean square error (MMSE), block linear minimum mean square error (BLMMSE), block decision feedback equalizer (BDFE), vertical Bell laboratories layered space–time (VBLAST) and space alternating generalized expectation maximization (SAGE) in terms of performance and computational complexity. From the simulation results and computational complexity, it is shown that both the proposed OBDFE and OBDFE–MPD methods provide a great trade-off between performance and computational complexity for high mobility OFDM system with transmit diversity.
KeywordsSTBC–OFDM OBDFE SAGE VBLAST MPD Doubly selective channel
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- 4.Lee, K.F.; Williams, D.B.: A space–time coded transmitter diversity technique for frequency selective fading channels. In: IEEE Sensor Array and Multichannel Signal Processing Workshop (SAM), pp. 149–152 (2000)Google Scholar
- 5.Wee, W.; Seo, J.W.; Lee, K.T.; Lee, Y.S.; Jeon, W.G.: Successive interference cancellation for STBC–OFDM systems in a fast fading channel. In: IEEE Vehicular Technology Conference, pp. 841–844 (2005)Google Scholar
- 7.Tso, C.Y.; Wu, J.M.; Ting, P.A.: Iterative interference cancellation for STBC–OFDM systems in fast fading channels. In: IEEE Global Telecommunications Conference (GLOBECOM), pp. 1–5 (2009)Google Scholar
- 8.Sheu, C.R.; Liu, J.W.; Huang, C.Y.; Huang, C.C.: A low complexity interference suppression scheme for high mobility STBC–OFDM systems. In: IEEE Vehicular Technology Conference (VTC Spring), pp. 1–5 (2012)Google Scholar
- 12.Rugini, L.; Banelli, P.; Leus, G.: Low-complexity banded equalizers for OFDM systems in Doppler spread channels. EURASIP J. Appl. Signal Process. 2006, 1–13 (2006)Google Scholar
- 13.Rugini, L.; Banelli, P.: Banded equalizers for MIMO-OFDM in fast time-varying channels. In: IEEE 14th European Signal Processing Conference (EUSIPCO), pp. 1–5 (2006)Google Scholar
- 21.Cho, Y.S.; Kim, J.; Yang, W.Y.; Kang, C.G.: MIMO-OFDM Wireless Communications with MATLAB. Wiley, Singapore (2010)Google Scholar