Multi-carrier transmission process and system in a difficult...

Details Multi-carrier transmission process and system in a difficult... Multi-carrier transmission process and system in a difficult...

H - Electricity

04

B

H04B 3/02 (2006.01) H04J 11/00 (2006.01) H04L 27/26 (2006.01) H04B 1/69 (2006.01) E21B 47/12 (2006.01)

Patent

CA 2613604

The invention proposes a data transmission process, from a first unit (1) situated at a predetermined depth of an oil well to a second unit (2) situated at the surface of this well, the process comprising a digital-analog conversion stage (8) of the data to obtain an analog signal forming support of the data, and an amplification stage (9) of this signal prior to its emission in a cable (11) connecting the two units, characterised in that at least two distinct scramblings (20, 21) of the data are completed, such that there is a first and a second set of scrambled data. After passage in a single complex inverse Fourier transform, that intended for emission is selected (26), whereof the dynamic in amplitude is the lowest. If the probability of saturating with a single set is 10-q, then due to this process the probability will be 10 -2q.

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