Patent ID: 6134278
Filing Date: 2000-10-17
Classification: H04B,H04L

Abstract:
A data rate detection system for detecting the rate of a frame of data received from a cellular telephone system, comprising:an interface for receiving one or more frames of soft data;a controller for successively assuming each of a plurality of data rates for the data and directing an iteration of processing of the soft data for each of the data rates;a de-repeater for de-repeating the soft data to produce de-repeated soft data;a scaler for scaling the de-repeated soft data to produce scaled soft data;a Viterbi decoder for decoding the scaled soft data to produce decoded hard data;a re-encoder for re-encoding the hard data to produce re-encoded hard data; andone or more correlation circuits for performing a correlation between the scaled soft data and the re-encoded hard data, each of the correlation circuits storing correlation data during each iteration for retrieval by the controller after the final iteration, the controller being operative, after the final iteration, to retrieve and evaluate the correlation data and to determine the rate of the frame of cellular telephone data frame depending on the correlation data.