Abstract:

A pilot aiming at mitigating the inter-cell interference of channel estimation in multi-input multi-output (MIMO) orthogonal frequency division multiplex (OFDM) systems is designed. The proposed pilot can make the power of interference distribute evenly over all the multi-path delays, so the inter-cell interference is similar to white noise. Based on characteristics of the proposed pilot, an improved frequency domain least squares (LS) channel estimation method is proposed. The algorithm is of low complexity, and is able to mitigate the inter-cell interference effectively even at existing of unknown multi-path delays, therefore, the performance of system will be improved significantly. Simulations validate the pilot design method and the channel estimation algorithm.

Key words: multi-cell, multi-input multi-output, orthogonal frequency division multiplex, pilot design, channel estimation