Multiplex communications – Wide area network – Packet switching
Patent
1996-03-14
1998-01-06
Trammell, James P.
Multiplex communications
Wide area network
Packet switching
370349, 370342, 370465, 375202, 375206, 375347, H04Q 130, H04L 1228
Patent
active
057064288
ABSTRACT:
A wireless LAN includes first stations adapted to operate at a 1 or a 2 Mbps data rate and second stations adapted to operate at a 1,2,5 or 8 Mbps data rate. The 1 and 2 Mbps rates use DBPSK and DQPSK modulation, respectively. The 5 and 8 Mbps rates use PPM/DQPSK modulation. All four data rates use direct sequence spread spectrum (DSSS) coding. All transmitted messages start with a preamble and header at the 1 Mbps rate. The header includes fields identifying the data rate for the data portion of the message, and a length field. For a 2 Mbps transmission the length field identifies the number of bytes in the data field. For a 5 or 8 Mbps the length field identifies the number of bytes in the data field which, if transmitted at 2 Mbps, would take the same transmission time of the data field, and is thus a fraction 2/5 or 2/8 of the actual number of the bytes. With this arrangements, all the stations are interoperable in a co-existent manner in the LAN.
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Boer Jan
Diepstraten Wilhelmus Josephus
Kamerman Adriaan
van Bokhorst Hendrik
van Driest Hans
Kaminis Shah
Lucent Technologies - Inc.
Malvone Christopher N.
Trammell James P.
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