Combinatorial coded telemetry in MWD
AssigneeDevelco, Inc.
InventorLouis H. Rorden
Life of this patent
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Abstract
A unipolar, RZ, constant width pulse telemetry is achieved in the combinatorial set, or any desired subset of pulse sequences thereof. Each input datum W is in one-to-one correspondence with a particular pulse sequence and the correspondence of datum with pulse sequence and vice versa is implemented by any selected ordering of the pulse sequences of the combinatorial set together with a successive comparison of the magnitude of the datum with the cumulative combinatorial capacity of the set.
Claims5
In borehole acoustic communication apparatus for communicating a datum, W, from a data source to a data receiver, by a sequence of time displaced, nonadjacent constant width pulses within a fixed time interval T.sub.w, said time interval having beginning and final ends and being independent of said datum W, comprising:
- (a) means for ordering a combinatorial set of said sequence of pulses;
- determining from said datum, a particular one of said sequence of time displaced pulses of said combinatorial set;
- and generating and transmitting said determined sequence of time displaced pulses from said data source to said data receiver;
- and
- (b) means for recovering said transmitted sequence of time displaced pulses and performing the inverse on the recovered sequence of pulses of determining a particular one of said sequence of time displaced pulses, to obtain a representation of said datum W.
Dependencies are inferred from the claim text.