Patent ID: 7352718
Filing Date: 2008-04-01
Classification: H04B,H04L,H04W

Abstract:
1. A method for operating an access point in a MIMO wireless communication system, said method comprising: inserting a first preamble into a first packet and a second preamble into a second packet, at least one of said first and second preambles comprising symbols for use in synchronization and both of said first and second preambles comprising symbols for use in channel estimation, wherein said first and second preambles are each configured with a quiet period to allow transmission of one of said symbols in said other packet; sending said first packet to a first subscriber unit via a first spatial subchannel; and sending said second packet to a second subscriber unit via a second spatial subchannel, said first spatial subchannel and said second spatial subchannel occupying the same bandwidth; wherein said second packet has greater data length than said first packet; and wherein sending said first packet and sending said second packet begin and end substantially simultaneously.