Adaptive modulation based on signal quality

Multiplex communications – Communication over free space – Repeater

Reexamination Certificate

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Details

C370S252000, C370S230000, C370S231000, C370S233000, C455S522000, C455S069000, C455S067110

Reexamination Certificate

active

07486634

ABSTRACT:
An apparatus and a method for improving the transmission efficiency when a retransmission of a communication is attained based on a Hybrid-ARQ (Automatic repeat ReQuest) system. A mode determining unit of a base station executes calculations to obtain a received signal quality difference between a received signal quality at the current stage and that of a past stage at a terminal, and supplies the received signal quality difference to a control unit. The control unit controls a power setting unit based on the received signal quality difference to control a transmission power of a signal transmitted from an adaptive coding and modulation unit. The present invention can be applied to a base station of a portable telephone communication network.

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