US Patent No. 9,294,164

NUMBER OF STREAMS INDICATION FOR WLAN


Patent No. 9,294,164
Issue Date March 22, 2015
Title Number Of Streams Indication For Wlan
Inventorship Hongyuan Zhang, Fremont, CA (US)
Raja Banerjea, Sunnyvale, CA (US)
Yong Liu, Campbell, CA (US)
Mao Yu, San Jose, CA (US)
Assignee MARVELL WORLD TRADE LTD., St. Michael (BB)

Claim of US Patent No. 9,294,164

1. A method for generating a preamble of a data unit for transmission via a communication channel, the method comprising:
including a first indication of a first number of spatial or space-time streams in a first sub-field of a first field of the
preamble, wherein the first number of spatial or space-time streams corresponds to transmission of the data unit to a first
receiver;

including one or more training sequences in a second field of the preamble;
including in a second sub-field of the first field an indication of whether space-time block coding is to be used in transmitting
the data unit via the communication channel;

when the data unit corresponds to only one receiver,
including in a third sub-field of the first field an indication that the data unit corresponds to only one receiver, and
including in a fourth sub-field of the first field of the preamble an indicator of the one receiver so that other receivers
can determine that the data unit is not addressed to the other receivers;

when the data unit corresponds to a group of multiple receivers,
including in the third sub-field an indication that the data unit corresponds to multiple receivers, and
including in the fourth sub-field of the first field of the preamble a second indication of a second number of spatial or
space-time streams, wherein the second number of spatial or space-time streams corresponds to transmission of the data unit
to the second receiver; and

formatting the preamble such that the first field of the preamble will be transmitted prior to the second field of the preamble
being transmitted.