Adaptive channel encoding method and device

Abstract

There is provided a channel encoder having convolutional encoders concatenated in parallel or in series. The channel encoder includes a first encoder for encoding input information bits, an interleaver having a memory and an index generator, for modifying the order of the information bits in a predetermined method, a second encoder for encoding the output of the interleaver, first and second terminating devices for terminating frames of input and output information bits of the first and second encoders, a tail bit generator for storing tails bits used in frame termination, and a controller and a switch for controlling the above procedure.

Description

technical field [0001] The present invention relates to an adaptive channel coding method and device for a communication system, in particular to an adaptive coding method and device used in the transmission of sound and data. Background technique [0002] A turbo encoder in a parallel or serial configuration with two simple component (or constituent) encoders generates parity from an input frame of N information bits bit symbol. Turbocoders use recursive systematic convolutional (RSC) codes as component (or component) codes. [0003] figure 1 It is a block diagram of a conventional parallel turbine encoder disclosed by Berrou in US Patent No. 5,446,747. exist figure 1 In the turbo encoder, the interleaver 12 is placed between the first and second component encoders 11 and 13. The size of the interleaver 12 is equal to the frame length N of the input information bits, and modifies the order of the information bits received in the second componen...

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Problems solved by technology

Although used in turbo encoders figure 1 or figure 2 The performance of the interleaver 12 is roughly proportional to the interleaver size, but the frame size of the turbo code is limited

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