Patent ID: 9031172
Filing Date: 2015-05-12
Classification: H04B,H04L

Abstract:
1. A method for receiving modulation symbols transmitted by a transmitter on a wireless transmission channel to a receiver, the signal being modulated by modulation symbols at a symbol frequency (f s ),The method comprising: providing, by a demodulator, observables (y operating, by a Viterbi equalizer, on a N-state lattice, each state representing a state of the transmission channel, each branch between two consecutive states of the lattice being associated with a modulation symbol, said equalizer including a branch metric calculation module receiving said observables, a metric calculation and path selection module from said branch metrics, and an in-lattice backtracing module for determining a survivor path; identifying, by a learning module, a pilot sequence of modulation symbols, said pilot sequence leading to a path passing through all the allowed branches of the lattice, and storing in a memory, for each of these branches, the corresponding observable; and calculating, by the branch metric calculation module, the metric of a branch as a distance between the observable provided by the demodulator and the observable stored for said branch.