Method and device for performing channel estimation

Device for performing a channel estimation of a channel between a source and a receiver, a noise with a frequency-dependent variance being added to the stream of symbols received by the receiver from the source through the channel, the receiver performing a demodulation in the frequency domain, characterized in that the device comprises:

• means for extracting symbols at pilot positions from the received stream of symbols,
• means for estimating noise variances at pilot positions,
• means for determining a rough channel estimation from the symbols extracted at pilot positions,
• means for determining weighting coefficients from the estimated noise variances,
• means for weighting the rough channel estimation by the determined weighting coefficients,
• means for filtering the weighted rough channel estimation using predetermined coefficients, at least one predetermined coefficient being different from the other predetermined coefficients, the predetermined coefficients being determined for a constant noise variance,
• means for determining normalization coefficients from the determined weighting coefficients and predetermined filter coefficients,
• means for normalizing the filtered weighted rough channel estimation using the determined normalization coefficients.