Component coder and coding method, double-output Turbo coder and coding method

Abstract

The invention is concerned with the component encoder and the decoding method, the initial condition set of the register is zero state in the component encoder, the component encoder uses the outputting feedback bit from the self register to decode at the control of the controlling switch after finish the decode for each decoding block, in order to ensure the final condition and the initial condition of the register are consistent after decode. The method is concerned with the double inputting Turbo encoder and the encoding method using the above component encoder. The invention can avoid the two time encoding process in the existing encoder, reduce computation quantity of encode and the coding delay, and reduce the decoding computation quantity of the receiving terminal.

Description

technical field [0001] The invention relates to the channel coding technology in the communication system, in particular to a component coder and its coding method, a double-input Turbo coder and its coding method. Background technique [0002] In order to improve the reliability of data transmission in the wireless communication environment and combat possible errors during data transmission, modern communication systems usually use forward error correction code (FEC) to encode the transmitted data at the transmitter. For example, Turbo code is a channel coding method with high error correction capability, and a coder using Turbo code for coding is called a Turbo coder. Turbo encoders are widely used in most data transmission systems, such as 3G, DVB-s2, WIMAX systems, etc. [0003] Generally, a Turbo encoder is composed of two or more identical component encoders, and the information bits to be encoded input by each component encoder are exactly the same, but the input se...

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Problems solved by technology

[0016] It is not difficult to see from the above-mentioned encoding process of the dual-input Turbo code that in order to obtain the state cycle characteristics of the component encoder, each encoding block to be encoded needs to be encoded twice by the two component encoders, and the dual-input Turbo encoder is added. The amount of encoding calculation and encoding delay, which is intolerable for communication systems with large encoding blocks

At the same time, although the existing encoding method guarantees the cyclic characteristics of the state of the component encoder, the decoder at the receiving end does not know the specific state. In order to achieve better decoding performance, it is usually necessary to convert the first piece of data Copying to the end of the encoding block artificially increases the length of the encoding block, thereby increasing the complexity of decoding

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