Talks and Poster Presentations (with Proceedings-Entry):
M. Simko, C. Mehlführer, T. Zemen, M. Rupp:
"Inter-Carrier Interference Estimation in MIMO OFDM Systems with Arbitrary Pilot Structure";
Talk: 73rd IEEE Vehicular Technology Conference (VTC2011-Spring),
- 05-18-2011; in: "Proc. 73rd IEEE Vehicular Technology Conference (VTC2011-Spring)",
In scenarios with time-varying channels such as intelligent
traffic systems or high speed trains, the orthogonality between
subcarriers in orthogonal frequency division multiplexing
(OFDM) is destroyed leading to inter-carrier interference (ICI).
In the literature, ICI equalization algorithms have been proposed;
however, they assume perfect channel knowledge at sample level.
Unfortunately, existing channel estimation algorithms do not
provide accurate channel estimates at high Doppler spreads,
prohibiting data transmission with high spectral efficiency. In
this paper, we propose an algorithm for ICI estimation that can
be applied to OFDM systems with an arbitrary pilot structure.
Thus, our algorithm can be applied to any already standardized
OFDM system. Our ICI estimator models the channel variation
by means of a basis expansion model (BEM). The performance
of the estimator and of the subsequent equalization is evaluated
in an UMTS long term evolution (LTE) link level simulator.
In a Rayleigh fading scenario, the proposed algorithm allows
a velocity increase of 150km/h without throughput degradation.
The gain in terms of the post-equalization signal to interference
and noise ratio (SINR) is about 3.7 dB at a user speed of 300 km/h.
Electronic version of the publication:
Project Head Christoph Mecklenbräuker:
Christian Doppler Lab "Funktechnologien für nachhaltige Mobilität"
Created from the Publication Database of the Vienna University of Technology.