Other

France Telecom

Denis Callonnec

Damien Castelain

Maryline Helard

Rodolphe Legouable

Pierre Combelles

Jean-Pierre Bauduin

Jean-Michel Lemesle

Daniel Pace

The invention relates to a method of determining the time shift and/or the power of a received signal incorporating a reference sequence () and transmitted by multicarrier modulation on a set (M) of carriers spaced from each other by a distance n&#x394;f where n is a natural integer and &#x394;f is a constant. An inverse Fourier transform is applied to the phase variations between components of the signal carried by carriers separated by k&#x394;f for consecutive values of k in order to obtain the impulse response (RI) of the signal and the time shift &#x3c4;and/or the power of the received signal is/are determined from the impulse response by observation of the highest level amplitude peak.

Determination of the time delay and/or power of a multicarrier signal

To interleave or deinterleave data elements in first and second blocks transmitted alternately and each having N data elements with rank n lying between 0 and N&minus;1, N being an integer, the data elements with ranks 0, . . . n, . . . N&minus;1 in the first blocks are ordered in accordance with the successive ranks A(0), . . . A(n), . . . A(N&minus;1) and the data elements with ranks 0, . . . n, . . . N&minus;1 in the second block are ordered in accordance with the successive ranks A,(0), . . . A,(n), . . . A,(N&minus;1). A and A,are different functions such that A,(A(n))&equals;n.

Data element interleaving/deinterleaving

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Rennes, France

Denis Callonnec