Detection of fast poll responses in a TWACS inbound receiver

Details Detection of fast poll responses in a TWACS inbound receiver Detection of fast poll responses in a TWACS inbound receiver

2007-08-09

2011-10-18

Zimmerman, Brian (Department: 2612)

Communications: electrical

Continuously variable indicating

Condition responsive

C340S010100, C375S260000

Reexamination Certificate

active

08040251

ABSTRACT:
A method for use in a power line communication systems for an electrical distribution system (1) to quickly and accurately poll electrical meters (6) installed at user facilities to determine if an outage has occurred at a facility. An outbound communications message is transmitted to the meter at the facility requesting a short response consisting of a bit pattern that is either partially or completely known to the receiver. Any perceived response from the meter is then processed to ascertain whether or not the meter actually transmitted a message. Receipt of a message indicates that an outage has not occurred at that site, while an indication the message was not received indicates an outage has likely occurred. In processing the received message, two types of errors can potentially occur; i.e., a false positive or a false negative. A false positive occurs when a detection algorithm used to process the response indicates that the meter sent a response when actually it did not. A false negative occurs when the detection algorithm indicates the meter did not send a response when actually it did. The method utilizes a signal processing algorithm to determine if a response was actually sent by the meter and is important because it minimizes the probability of both types of errors.

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