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J. Blumenstein, R. Marsalek, Z. Fedra, A. Prokes, C. Mecklenbräuker:
"Channel estimation method for OFDM in low SNR based on two-dimensional spreading";
Wireless Personal Communications, 78 (2014), 1; 715 - 728.

In this paper, we present a channel estimation method based on two-dimensional signal spreading applicable to Orthogonal Frequency Multiple Access (OFDM) multicarrier systems. Our method exploits a spreading of a transmitted data signal as well as a pilot signal over the assigned frequency range and time period. As a spreading sequence we exploited orthogonal Walsh-Hadamard sequences.
When compared with traditional pilot symbol based channel estimation, our method is beneficial in low Signal to Noise Ratio (SNR).
For a comparison of our method with state-of-the-art channel estimation method, we utilized an open source LTE downlink simulator developed at TU Vienna. This enables a reproducibility of our results. Considering the LTE system, our method outperforms the traditional approach in typical range of SNR from -5 dB to 10 dB. For a comparison of a throughput performance, a number of channel models has been employed.

Channel estimation, LTE, 2D signal spreading, OFDM

http://dx.doi.org/10.1007/s11277-014-1779-y

Project Head Christoph Mecklenbräuker:
Christian Doppler Lab "Funktechnologien für nachhaltige Mobilität"