Synchronous CDMA telemetry system for use in a wellbore
First Claim
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1. A method of communicating data in a wellbore, the method comprising the steps of:
- installing multiple sensor nodes in the wellbore, each of the sensor nodes including at least one sensor producing a respective digital output;
multiplying each sensor'"'"'s output by a digital code unique to that sensor to thereby produce an encoded output of each sensor; and
simultaneously transmitting the encoded outputs of the sensors to a remote location via a transmission channel.
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Abstract
A synchronous CDMA telemetry system is provided for use in a wellbore. In one described embodiment, each data bit of digital outputs of multiple downhole data sources is multiplied by an orthogonal code unique to each data source. The resulting encoded outputs are modulated on a carrier frequency and summed on a transmission channel. The resulting signal is demodulated at a remote location and separately multiplied by each of the codes to separate out the contributions to the signal from each data source. The individual demodulated and decoded outputs are then integrated over the length of each data bit.
20 Citations
33 Claims
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1. A method of communicating data in a wellbore, the method comprising the steps of:
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installing multiple sensor nodes in the wellbore, each of the sensor nodes including at least one sensor producing a respective digital output;
multiplying each sensor'"'"'s output by a digital code unique to that sensor to thereby produce an encoded output of each sensor; and
simultaneously transmitting the encoded outputs of the sensors to a remote location via a transmission channel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A method of communicating data in a wellbore, the method comprising the steps of:
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installing multiple data sources in the wellbore;
encoding each bit of a digital output of each data source by multiplying the bit by a unique code corresponding to the data source, thereby producing an encoded output of each data source;
transmitting the encoded data source outputs simultaneously on the same transmission channel to a remote location; and
separating the data source outputs at the remote location by multiplying each bit of the simultaneously transmitted encoded data source outputs by each of the codes. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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Specification