Patent ID: 9654308
Date: 2017-05-16
CPC Classifications: H04L

Claim:
1. A wireless communication device comprising: at least one memory comprising computer-executable instructions stored thereon; and one or more processing elements to execute the computer-executable instructions to: cause to receive one or more streams comprising one or more encoded long training field (LTF) symbols over a wireless communication channel; determine a number of streams comprised in the one or more streams; determine a number of LTF symbols comprised in the one or more LTF symbols, wherein the number of streams is less than the number of LTF symbols; determine a first phase of the wireless communication channel upon receipt of a first LTF symbol; determine a second phase of the wireless communication channel upon receipt of a second LTF symbol; determine a phase difference between the first phase and the second phase; determine a carrier frequency offset (CFO) of the wireless communication channel using the determined phase difference; and modify the wireless communication channel based at least in part on the determined CFO; and determine one or more additional LTF symbols added to the one or more encoded LTF symbols, where a total number of LTF symbols encoded in the one or more streams is equal to the determined number of streams, wherein the total number of LTF symbols comprises a first decodable set of LTF symbols and a second decodable set of LTF symbols, wherein a first portion of the one or more additional LTF symbols are added to the first decodable set using a first orthogonal matrix of a first size and a second portion of the one or more additional LTF symbols are added to the second decodable set using a second orthogonal matrix of a second size different from the first size.