公开(公告)号：US10187124B2

公开(公告)日：2019-01-22

申请号：US15283168

申请日：2016-09-30

Applicant: MEDIATEK INC.

Inventor： Jianhan Liu ,  Shuling Feng ,  Thomas Edward Pare, Jr. ,  YungPing Hsu

IPC: H04B7/02 ,  H04L27/26 ,  H04L25/02 ,  H04B7/06 ,  H04W84/12

Abstract: A method of transmitting and receiving a HE PPDU and perform channel estimation enhancement is proposed. The HE PPDU comprises legacy preamble, HE-STF, HE-LTF, and data. A beam-change indication indicates if the pre-multiplied beamforming Q-matrix is changed from legacy preamble to H-SFT, HE-LTF, and data portion. A value of 1 indicates that Q matrix is changed. A value of 0 indicates that Q matrix is unchanged and receiver should be safe to combine L-LTF and HE-LTF. The beam-change indication can be used to significantly enhance channel estimation at receiver. When there is no beam-change, receiver does not change operation during HE-STF and HE-LTF such that the channel estimations can rely on the combination of L-LTFs, L-SIG, RL-SIG, HE-SIGAs and HE-LTF.