Obviousness

I am unable to perform an obviousness analysis of US patent 10348471 under 35 U.S.C. § 103, for the following reasons:

1. Lack of Specific Claims: The user prompt does not provide the claims of US patent 10348471. A proper obviousness analysis requires comparing the claimed invention against prior art.
2. Absence of Identifiable Prior Art Documents: The "Prior art keywords" section of the provided patent text lists only general keywords ("sig", "field", "frame", "station", "channel bandwidth") and a "Prior art date" (2015-08-07). It does not include any specific prior art references (e.g., patent numbers, academic papers, industry standards documents) that could be combined for an obviousness argument. The background section explicitly states that information within it should not be assumed to be prior art merely because it is mentioned there.

Without specific claims to analyze and without any identified prior art documents to combine, I cannot determine combinations of prior art references that would render the claims obvious or explain the motivation for combining them.