Motorola Corporation

David Mark Johnson

Brian T Kelley

David B Taubenheim

A radio receiver circuit (,) is used for receiving a multi-level signal (,) that includes a plurality of symbols, wherein each level is representative of a symbol of data. Baseband samples are generated for each symbol, whereby each baseband sample has a phase and a signal level. The radio receiver circuit (,) measures the received signal environment. A digital circuit (,) selects a scan duration from a scan duration table (,) based on the measured signal environment and a combination of signal types used for classification of the received signal. The digital circuit tallies, by category, occurrences of the baseband samples, whereby each category is representative of one of a plurality of phases, and one of a plurality of signal level ranges. The digital circuit (,) selects a set of optimized thresholds from a table of predetermined, optimized thresholds (,), based on the measured signal environment and a combination of signal types, and correlates the tallies to at least one template, and classifies the multi-level signal according to the correlation results and the selected optimized thresholds.

Method and apparatus for adaptively classifying a multi-level signal

A multiply accumulate circuit (600) includes a multiply accumulate reduction circuit (527) that generates P current accumulated operands during an iteration. P operand registers (582) are coupled to the multiply accumulate reduction circuit (527). A corresponding one of the P current accumulated operands is stored in each of the P operand registers (582) in place of one of the P partial accumulated operands in response to the iteration. Each of P feedback paths (593) couples one of P outputs of the P operand registers (582) to a corresponding one of P feedback inputs of the multiply accumulate reduction circuit (527). An adder (561) that is coupled to the P outputs through isolation circuits (570) generates an output (551) in N iterations that is a sum of N products, each being a product of one of a series of N multipliers and one of a series of N multiplicands.

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Delray Beach, FL, United States of America

David Mark Johnson