Parallel multistage decision feedback equalizer for single-carrier layered space-time systems in frequency-selective channels

Authors:
Jing Xu;Haifeng Wang;Shixin Cheng;Ming Chen
Affiliations:
National Mobile Communications Research Lab, Southeast University, Nanjing, China;Nokia Mobile Phones, Elektroniikkatie, Oulu, Finland;National Mobile Communications Research Lab, Southeast University, Nanjing, China;National Mobile Communications Research Lab, Southeast University, Nanjing, China
Venue:
EURASIP Journal on Applied Signal Processing
Year:
2004

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Abstract

Space-time transmission techniques can greatly increase the spectral efficiency. In this paper, a parallel multistage decision feed-back equalizer (PMDFE) is proposed for single-carrier layered space-time systems with a fixed cyclic prefix over frequency-selective channels. It is composed of a parallel interference canceller, a multiple-input single-output decision feedback equalizer (MISO-DFE), and a linear combiner. The soft output of the MISO-DFE is linearly combined with the previous tentative soft decision. In addition, an algorithm is proposed to obtain tentative soft and hard decisions for initializing the equalizer. The initializing complexity of the PMDFE is lower than that of MIMO-OFDM. Simulation results show that the PMDFE outperforms MIMO-OFDM and previously existing equalizers for single-carrier layered space-time systems.