Patent ID: 7298778

Claim:
A method for receiving a signal transmitted on a multipath transmission channel using a spread spectrum technique with a low spreading factor, said signal being transmitted in the form of sequences of coded binary symbols comprising predefined pilot symbols and data symbols, multiplied by a spreading sequence, said method including a step of determining a channel estimate using received predefined pilot symbols, the method comprising reconstituting the transmitted signal by means of a rake receiver using a rake receiver that utilizes the channel estimate on the basis of received signals that were transmitted over the multiple paths of the transmission channel, determining an equivalent model of the channel as seen at the output of the rake receiver as a function of the channel estimate, reducing intersymbol interference in the reconstituted transmitted signal resulting from the low spreading factor, using the channel equivalent model and a DDFSE detector based on a trellis with a reduced number of states and delivering at its output estimated values of the received coded symbols, de-interleaving the coded symbols, and decoding the estimated values of the de-interleaved coded symbols to reconstitute the transmitted data symbols.