Coexistence of modulation schemes in a WLAN

Details Coexistence of modulation schemes in a WLAN Coexistence of modulation schemes in a WLAN

2002-02-19

2008-12-30

Pham, Chi H (Department: 2616)

Multiplex communications

Communication over free space

Combining or distributing information via time channels

C370S312000, C370S329000, C455S451000, C455S452100

Reexamination Certificate

active

07471667

ABSTRACT:
A local area network is provided where an OFDM station and DSSS/CCK station coexist. During a contention-free period both stations operate under the point coordination function rules as defined in the IEEE 802.11 specification. Both stations transmit data when polled by the access point. The contention-free period comprises a sub-contention period during which only the OFDM station communicate. During the sub-contention period the OFDM station operates under the distributed coordination function while the DSSS/CCK station waits to be polled by the access point before starting to communicate.

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