ESTIMATING A TRANSMISSION CHANNEL WITH PILOT SYMBOLS DISTRIBUTED IN LATTICE STRUCTURE

摘要

The invention concerns a method and devices for estimating a transmission channel from a multicarrier signal transmitted through said transmission channel, the signal comprising real pilot symbols and so-called pure imaginary pilot symbols, the methods consisting in selecting one or several values zk of the received signal corresponding respectively to one or several real pilot symbols, and one or several values zl of the received signal corresponding respectively to one or several pure imaginary pilot symbols, said pilot symbols being sufficiently close both in frequency and in time such that it can be assumed that the fading of the signal through the transmission channel has a complex value alpha substantially identical for said symbols, and further consisting in determining an estimated value &cir& alpha of alpha for the pilot symbols concerned, by minimizing a least square equation involving the values zk and the values zl.