System for oderwire modulation

Details System for oderwire modulation System for oderwire modulation

2007-06-14

2008-10-14

Harper, Kevin C (Department: 2616)

Multiplex communications

Communication over free space

Combining or distributing information via frequency channels

C370S465000, C370S503000

Reexamination Certificate

active

07436812

ABSTRACT:
Systems for orderwire modulation are provided. In one embodiment, a bidirectional communication system comprises a first remote unit for communicating with a host unit using orthogonal frequency division multiplexing, the host unit communicatively coupled to a plurality of remote units in a multipoint-to-point configuration; wherein the first remote unit is configured to transmit up to a plurality of tones, the up to a plurality of tones modulated with upstream information using orthogonal frequency division multiplexing; and wherein the first remote unit is configured to modulate at least one tone of the up to a plurality of tones with payload data using a first modulation scheme, and modulate at least one tone of the up to a plurality of tones with control data using a second modulation scheme, the second scheme more robust than the first modulation scheme.

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