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Advanced Mud Pulse Telemetry: M-Ary Encoding for MWD Tools [Chapter 2]
Download this free white paper to learn about the encoding and higher-level design of M-Ary mud pulse telemetry.
About this white paper
This White Paper focuses on how the mud-pulse telemetry transmitter sends out blocks of encoded pulses after every flow cycle in the following order:
For an introduction to M-Ary telemetry, please see the MUD Pulse Telemetry M-ARY Encoding and Decoding white paper by Erdos Miller.
M-Ary pulse encoding is a form of phase shift keying. The packets are encoded in 4 TU’s (for 2-bit) or 8 TU’s (for a 3-bit packet). The position of the rising edge of the pulse determines the packet value.
For instance, in a 2-bit packet, the pulse would start at position 0 TU when the packet value is 3, at 1 TU for a value of 2, at 2 TU for a value of 1 and at 3 TU for a value of 0. Note that the pulse width itself is 2 TUs. Each packet is separated from the next packet by 4 TU’s.
Here's an example:
