Motorola Corporation

Edward M Roney, Iv

Stephen V Cahill

Bryan A Potratz

The process of the present invention receives encoded data over a channel, decodes the data, and estimates the number of errors induced by the channel. The proper convolutional decoder is chosen by comparing the bit error rates to a threshold that is biased in favor of the FACCH message being present on the channel. The selection process of the present invention requires reduced processing time by the processor thereby reducing the power requirements of the processor.

Decoder selection

The process of the present invention encompasses a method for automatically controlling the gain of a transponded modulation signal. The process receives a demodulated signal, detects whether SAT is present, and transmits the SAT. Before transmission, the transmitted SAT is adjusted for the gain of the modulator and for the gain of the receiver.

Automatic gain control of transponded supervisory audio tone

The bit error rate (BER) estimation process of the present invention receives encoded data over a channel, decodes the data, and estimates the number of errors induced by the channel. The process of the present invention requires reduced processing time by the processor thereby reducing the power requirements of the processor.

Bit error rate estimation

The decoding process of the present invention receives encoded data over a channel, decodes the data, and estimates the number of errors induced by the channel. The decoded date is stored in memory. If no errors were detected, the data stored in memory is used as the decoded signal. The process of the present invention requires reduced processing time by the processor thereby reducing the power requirements of the processor.

Speech decoding in a zero BER environment

The process of the present invention operates on the voice codewords transmitted in a digital cellular radiotelephone environment. The process first determines if a voice is active (201) on the communications path from the base station to the radiotelephone. If a voice is present, a threshold is calculated (202). Any signals on the reverse path from the radiotelephone to the base station that are below this threshold (203) are replaced by noise that is at the same level as the ambient noise (204).

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Grayslake, IL, United States of America

Edward M Roney, Iv