Communications system, methods and apparatus

Multiplex communications – Generalized orthogonal or special mathematical techniques

Reexamination Certificate

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Details

C370S319000, C370S328000, C370S344000

Reexamination Certificate

active

07403470

ABSTRACT:
An OFDM wireless communications system includes terrestrial and satellite based base stations. Mobile nodes support two uplink modes of operation, multi-tone mode for terrestrial station interaction and single tone mode for satellite base station interaction. In single tone mode the peak to average power ratio is lower than in the multi-tone mode allowing the same power amplifier to transmit higher average power signals and thus extend range and reach a satellite in geostationary orbit. In multi-tone mode, the mobile node: is temporarily assigned a multi-tone uplink traffic channel segment for user data, is assigned a dedicated control channel for uplink control signals, and supports slaved Ack/Nak for traffic channels. In single tone mode, the mobile node: is assigned a single logical uplink dedicated tone to use for transmitting both user data and control data, and does not use a slaved Ack/Nak mechanism for traffic channels.

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International Search Report for PCT/US2006/022702, 3 pages, dated Oct. 16, 2006.
Written Opinion of the International Searching Authority for PCT/US2006/022702, 6 pages, dated Oct. 16, 2006.

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