Pilot Structure and Channel Estimation for Multicarrier-based Uplink Cellular Systems

We have proposed Frequency Hopping Spread Spectrum OFDMA (FH/SS-OFDMA) [1] as a novel solution for uplink multiple access scheme. In this paper, it is shown that FH/SS-OFDMA has good features to have efficient pilot structure especially on uplink OFDMA systems. Hop-based pilot structure for FH/SS-OFDMA is designed and channel estimation is successfully performed with 2D-LMMSE estimator. We also propose specific pilot patterns for asynchronous cellular environment where intercell interference severely degrades channel estimation performance. The performance of the system is evaluated in our multicell simulator generating all interferers individually, which gives more reliable results than previous works. 1

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