Multiplex communications – Generalized orthogonal or special mathematical techniques – Quadrature carriers
Reexamination Certificate
2007-06-12
2007-06-12
To, Doris H. (Department: 2616)
Multiplex communications
Generalized orthogonal or special mathematical techniques
Quadrature carriers
C370S208000, C370S210000, C370S335000, C375S260000, C455S525000
Reexamination Certificate
active
09822906
ABSTRACT:
Orthogonal frequency division multiplexing (OFDM) is used to divide a single TDMA time slot into multiple non-contending access request opportunities that are reserved for particular subscriber units. An OFDM burst is divided into multiple tonesets where each toneset is allocated for access request by a particular subscriber unit. One application is providing an efficient mechanism for requesting resumption of periodic grants of time slots to support a voice call after a quiet period during which such time slots were temporarily unnecessary. A single access request slot can provide an opportunity for multiple subscriber units to request such a resumption.
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Jones Vincent K.
Raissinia Alireza
Cisco Technology Inc.
Kaplan Cindy
Moore Ian N.
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