Interference cancellation for MIMO-OFDM systems in the case of insufficient guard interval length

Van Nguyen D.
Hanoi University of Technology, Faculty of Electronics and Telecommunications, Dai Co Viet Str. 1, Hanoi, Viet Nam

Abstract: This paper proposes a new interference cancellation scheme for multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) systems in the presence of intersymbol interference (ISI). The proposed interference cancellation scheme uses the estimated channel coefficients and the channel state information (CSI) to reproduce the interference components, then iteratively cancel them from the received signals. The so-called remodulation technique is also included in this scheme to enhance the interference cancellation performance. To illustrate the proposed method, we assume that the MIMO-OFDM system does not use a guard interval (spectral efficiency factor η1 = 1). Simulation results show that the performance of system in terms of the symbol error ratio (SER) is significantly improved by applying one iteration of the proposed canceller. After two iterations, the SER is slightly better than the results obtained if the guard interval (GI) length is sufficient (η = 0.87). © 2006 IEEE.
Author Keywords: Interference cancellation; MIMO-OFDm systems
Index Keywords: Channel estimation; Channel state information; Decision feedback equalizers; Frequency allocation; Gain control; Intersymbol interference; MIM devices; Multiplexing; Orthogonal frequency division multiplexing; Radio interference; Spectrum analyzers; Telecommunication; Telecommunication systems; Wireless telecommunication systems; channel coefficients; Channel-state information (CSI); Guard interval (GI); Inter-Symbol Interference (ISI); Interference cancellation (IC); interference cancellation scheme; interference components; international conferences; MIMO-OFDM; MIMO-OFDM systems; Multiple-Input-Multiple- Output (MIMO); Orthogonal frequency division; Received signals; simulation results; Spectral efficiency (SE); Symbol error ratio (SER); Frequency division multiplexing

Year: 2006
Source title: HUT-ICCE 2006 First International Conference on Communications and Electronics, Proceedings
Volume: PART 1
Art. No.: 4156468
Page : 178-183
Link: Scorpus Link
Authors with affiliations:

1. Van Nguyen, D., Hanoi University of Technology, Faculty of Electronics and Telecommunications, Dai Co Viet Str. 1, Hanoi, Viet Nam

Correspondence Address: Van Nguyen, D.; Hanoi University of Technology, Faculty of Electronics and Telecommunications, Dai Co Viet Str. 1, Hanoi, Viet Nam
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