Patent ID: 8532077
Filing Date: 2013-09-10
Classification: H04B,H04L

Abstract:
1. Non-resolvable long training field (LTF) formatting methods used in wireless networks, comprising: if different number of streams are being sent to different users and short guard interval is used, then defining said non-resolvable LTF frame format so that a transmission of VHT-SIG-B is aligned for all users, thereby requiring that a VHT-LTF portion of a packet be of a same duration for all users; wherein requiring that a VHT-LTF portion of a packet be of a same duration for all users is achieved by transmitting a same number of VHT-LTFs to each user; wherein transmitting a same number of VHT-LTFs to each user is achieved by choosing the number required for a user with the most streams and transmitting said number of VHT-LTFs to each user; wherein for users that require a smaller number of VHT-LTFs, said VHT LTFs are repeated to reach a needed number of VHT-LTFs so that the VHT-LTF portion be of the same duration for all users.