Downhole telemetry system using discrete multi-tone...

Details Downhole telemetry system using discrete multi-tone... Downhole telemetry system using discrete multi-tone...

2006-04-11

2006-04-11

Wong, Albert K. (Department: 2635)

Communications: electrical

Wellbore telemetering or control

Multiplexed signals

C340S855400, C375S261000, C370S476000, C370S474000

Reexamination Certificate

active

07026952

ABSTRACT:
A downhole telemetry system and method using discrete multi-tone modulation having repeated symbols. The system includes a surface receiver, a cable, and a downhole transmitter coupled to the surface receiver via the cable. The transmitter communicates a time-domain signal to the receiver. The time-domain signal has a cyclic prefix for a symbol at least as long as the length of the symbol. The system may alternatively include the time-domain signal having a symbol followed immediately by a copy of the symbol. The method includes receiving a time-domain signal carrying desired information at specific frequencies. The signal has at least one symbol. The method includes prepending a cyclic prefix having first length to the beginning of the symbol. The cyclic prefix has a second length no longer than the first length. The method may alternatively include appending a copy of the at least one symbol to the end of the at least one symbol.

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