Method and device for encoding low-density parity check code

Abstract

The invention provides a method and device for encoding a low-density parity check code. The method comprises the following steps of: comparing a mother code rate and a transmission code rate which are supported by a uniform basic matrix; determining the length K'of an input information grouping bit according to a comparison result; determining an encoding matrix of the low-density parity check (LDPC) code according to the uniform basic matrix and an expansion factor; determining an information bit to be encoded according to the received information grouping bit with the length of K'; and performing LDPC encoding on the information bit to be encoded by using the encoding matrix, and processing a mother code word bit obtained through encoding to acquire a code word bit to be transmitted. By the method and device for encoding the LDPC code, the basic matrix and the expansion factor are determined; the input information grouping length is determined or the encoding matrix is processed according to the received transmission code rate, so the code word which is in accordance with the transmission code rate can be acquired; on the basis of the optimal performance, the changeability of the code rate is realized; furthermore, the hardware design complexity is reduced and the cost is lower.

Description

technical field [0001] The invention relates to the field of digital communication, in particular to an encoding method and device of a low-density parity check code. Background technique [0002] Currently, a digital communication system is a commonly used communication system. Such as figure 1 As shown, a digital communication system consists of a transmitter, a channel, and a receiver. The transmitter usually includes a source, a source coder, a channel coder, and a modulator (or a writing unit); the receiver usually includes a solution tuner (or readout unit), channel decoder, source decoder and sink; there is a channel (or storage medium) between the transmitting end and the receiving end, and there is a noise source in the channel In a digital communication system, and The channel coding link (including channel coding, modulation and demodulation, etc.) is the most critical technology in the physical layer of the entire digital communication, which determines the eff...

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Problems solved by technology

[0024] In IEEE802.16e, the code rates supported by LDPC codes are 1 / 2, 2 / 3, 3 / 4, and 5 / 6. In existing LDPC code coding schemes, LDPC coding matrices H with different mother code rates are usually used. , to ensure that the LDPC code has a certain degree of flexible code rate and performance, at this time, there will be four fundamental matrices H b , multiple LDPC encoders and decoders are required on the hardware, which will greatly increase the cost of hardware implementation; or use an encoder / decoder that can adapt to a variety of mother code rates to implement encoding and decoding with different code rates, but the hardware design It will be very complicated, and it will also greatly increase the cost of hardware implementation

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