The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 12, 2016
Filed:
Sep. 17, 2015
National Instruments Corporation, Austin, TX (US);
Yong Rao, Austin, TX (US);
National Instruments Corporation, Austin, TX (US);
Abstract
Techniques are disclosed relating to generating pilot sequences for channel estimation and/or equalization. In some embodiments, a generated pilot sequence has a flat frequency response, a null portion, and low autocorrelation. In some embodiments, a method for generating the pilot sequence includes: starting with a Constant Amplitude Zero Autocorrelation (CAZAC) sequence and iteratively performing, until the result has a flat magnitude: padding the sequence with zeros, determining whether a frequency transform (FT) of the zero-padded sequence has a flat magnitude, adjusting a phase of a second sequence (that has a desired frequency response) to match a phase of the FT, determining an inverse FT of the adjusted second sequence and using a result of the inverse FT as the sequence for the next iteration. The disclosed techniques may allow efficient production of pilot sequences for use in cellular networks, for example.