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Channel convolutional coding method of digital communication system

A convolution coding and channel technology, applied in digital transmission system, using convolution code error correction/error detection, transmission system, etc., can solve the problem of consuming precious resources of the processor, and achieve the effect of convenient segmented convolution

Inactive Publication Date: 2003-12-31
INST OF TELECOMM TRANSMISSION MINIST OF INFORMATION IND +1
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Problems solved by technology

[0024] The purpose of the present invention is to propose a channel convolution coding method based on impulse response to perform convolution, so as to overcome the disadvantage of consuming a large amount of valuable resources of the processor in the third generation mobile communication system in the prior art when channel coding

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  • Channel convolutional coding method of digital communication system
  • Channel convolutional coding method of digital communication system
  • Channel convolutional coding method of digital communication system

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Embodiment Construction

[0039] figure 1 The shown 3G TS 25.212 v3.1.1 specification of 3GPP is a hardware implementation circuit of a 1 / 3 convolutional code whose rate is lower than 32 kbps. It can be seen from the knowledge of the coding principle that the coding storage of the encoder is 8, and the coding constraint degree N is 9. It is widely used in data communication systems, especially the third generation mobile communication systems. The following will specifically explain how to use the impulse response to implement convolutional coding.

[0040] by figure 2 For example, inputting a bit M(t) at any time t is equivalent to figure 1 The encoder generates an impulse, and the corresponding '1' impulse response is the nine codewords c0...c8 corresponding to t, t+1, ..., t+8; when the input bit is 0, The '0' impulse response is t, t+1,..., t+8 corresponding to c0...c8 nine codewords (except that the code elements are all 0 at this time), called t...t+ 8 is the survival period of the impulse,...

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Abstract

The present invention discloses a method for implementing rapid channel convolutional coding by using impulse responce principle, and is characterized by that firstly, prestoring length of response state of coder, making simple O.I judgement for input bit, storing impulse responce to 1. ignoring impulse responce of O, then making cyclic iterative treatment to obtain convolutional code of channel.Said invention is applicable of convolutional coding treatment of all constraint lengths and all code efficients in the digital communication system. The adoption of channel convolution coding methodcan reduce lots of operational quantity, reducing load of DSP resource and can implement real time rapid processing in the third-generation mobile communication system.

Description

technical field [0001] The present invention relates to error control technology in the field of digital communication. Background technique [0002] The purpose of communication is to transmit information that the other party does not know to the other party in a timely and reliable manner. Therefore, it is required that a communication system must transmit messages reliably and quickly. Reliability and speed are often a pair of contradictions in digital communication systems. If it is required to be fast, the time occupied by each data symbol will inevitably be shortened, the waveform will be narrowed, and the energy will be reduced. As a result, the possibility of errors will increase after interference, and the reliability of transmitting messages will decrease. If reliability is required, the rate at which messages are transmitted is slowed down. Therefore, how to reasonably resolve the contradiction between reliability and speed is one of the key issues in correctly ...

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Application Information

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IPC IPC(8): H03M13/23H04L1/00
Inventor 白涛刘太江刘奕文王磊赵国峰
Owner INST OF TELECOMM TRANSMISSION MINIST OF INFORMATION IND
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