Encoding method of Turbo code and decoding method

Abstract

The invention discloses an encoding method of a Turbo code and a decoding method. The encoding method comprises: on the one hand, directly carrying out low-order modulation on externally input information bits x(k), currently outputting information bits, and marking the same as x''(k); sending the information bits x(k) into a first sub-encoder at the same time; firstly receiving the information bits x(k) by the first sub-encoder, and outputting check bits y(k); appending zeroing bits at the tail part of the x(k) at the same time to enable the first sub-encoder to be in a zero state after encoding is completed; marking the x(k) and the zeroing bits as x'(k); using an interleaver to scramble the order of the x'(k), then sending the same to a second sub-encoder, and outputting check bits z(k); directly carrying out high-order modulation on the check bits y(k) and z(k), carrying out combining to form a symbol yz(k), and outputting the same at the same time; and carrying out alternate switching of a multiplexing module mux on the x''(k) and the yz(k), then alternately outputting the x''(k) and the yz(k), and obtaining a data stream Rx(k) with a code rate as 1 / 2. The method achieves gooderror correction capability of the Turbo code under a short code condition; and uses the code rate of 1 / 2 to achieve performance better than that of an existing code rate of 1 / 3. The method is suitable for use in the field of digital communication.

Description

technical field [0001] The present invention relates to the field of digital communication, and more particularly, to a coding method and a decoding method of a Turbo code. Background technique [0002] The Turbo code in the prior art is a high-performance error correction code that is very close to the Shannon limit, and the difference between its bit error rate curve and the theoretical limit can be less than 0.01dB. Existing Turbo codes are suitable for long frames containing thousands or more symbols within the data of each frame. In a short frame with only dozens of symbols per frame, especially in narrowband communication or fast frequency hopping communication, the error correction capability or coding gain of the existing Turbo code will be drastically reduced. Compared with ordinary error correction codes, such as RS codes, convolutional codes, etc., in the case of complex operations, the error correction capability of the existing Turbo codes is not much improved....

AI Technical Summary

Problems solved by technology

[0013] In order to solve the problems of low error correction capability and low transmission efficiency of existing Turbo codes in short frame transmission, the present invention provides a Turbo code encoding method and a decoding method, which can make Turbo codes in short frame transmission Improve error correction capability and improve coding efficiency, thereby improving transmission efficiency

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