| Paper: | SPCOM-P6.10 | ||
| Session: | OFDM and Multi-Carrier Systems | ||
| Time: | Wednesday, May 19, 15:30 - 17:30 | ||
| Presentation: | Poster | ||
| Topic: | Signal Processing for Communications: Detection, Estimation, and Demodulation | ||
| Title: | ON THE EQUALIZATION OF ASYNCHRONOUS MULTIUSER OFDM SIGNALS IN FADING CHANNELS | ||
| Authors: | Hyejung Jung; Purdue University | ||
| Michael Zoltowski; Purdue University | |||
| Abstract: | In this paper we study asynchronous multiuser orthogonal frequency division multiplexing (OFDM) systems over fading channels. Multiuser multiplexing is essential to design a spectrally efficient communication system. On the other hand, a synchronous mode of communication may not be a practically realizable solution considering the demand for high-speed services with portability. Therefore, we develop the model of asynchronous multiuser OFDM signals, and propose several MMSE based equalization methods to supress the asynchronous interference effectively. The proposed space-time domain MMSE filter mitigates the inter-carrier interference (ICI) and the inter-block interference (IBI) induced by the interfering user's relative delay. Furthermore, additional performance gains can be achieved via a two-step procedure, which applies the space-time MMSE filter twice, first to estimate the interference and secondly to equalize the signal after interference cancellation. | ||
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