Patent ID: 8503556
Filing Date: 2013-08-06
Classification: H04L

Abstract:
1. A channel estimating method in an orthogonal frequency division multiplexing, OFDM, system transmitting a signal over a channel, said signal comprising a plurality of symbols, wherein each of said symbols comprises at least one null subcarrier, wherein the method comprises the following steps: obtaining by a receiver device at least one initial channel estimate Ĥ calculating by said receiver device at least one soft information, from said at least one initial channel estimate Ĥ updating said at least one initial channel estimate Ĥ decomposing said partial FFT Matrix Ω applying a threshold value T for at least one singular value of said matrix Σ, wherein one singular value of said matrix Σ is kept unchanged when greater than said threshold T and is set to null when lower than said threshold T; deriving resulting truncated matrices U calculating channel estimates by applying said matrices U