CHANNEL ESTIMATION USING CYCLIC CORRELATION

摘要

Methods, systems, and devices for channel estimation and/or earliest path detection in a location tracking system are described. The described tools and techniques may involve accumulation of energy of multiple copies of a periodic sequence, which may be contained and/or associated with a signal transmitted from a location tracking tag. One or more access points within the location tracking system may receive and process multiple copies of the sequence, employing period-wise coherent accumulation, and estimate an earliest path, or a corresponding delay associated with an earliest path, of the sequence. The access point(s) may transmit information related to the earliest path, including the corresponding delay, to a tracking management server, which may use the information to estimate and/or determine a location of a tag.

主权项

1. A method to perform channel estimation, comprising:
identifying a period of each of multiple copies of a sequence; identifying a period of each of multiple channel estimation windows, the period of each of the channel estimation windows being based at least in part on the period of each of the multiple copies of the sequence; and accumulating energy of each of the multiple copies of the sequence during each of the multiple channel estimation windows, a first channel estimation window being initiated before an expected sequence receive time.