Apparatus and method for transmitting and receiving coded data by encoder having unequal error probability in mobile communication system

Abstract

The inventin discloses an apparatus for transmitting information bits after coding the information bits with Low Density Parity Check (LDPC) codes having unequal error probability values in a wireless communication system which channel-codes and transmits the information bits. The apparatus includes a LDPC encoder for mapping high information bits to low variable nodes and low information bits to high variable nodes, the high information bits having high importance priorities and the low information bits having low importance priorities from among the information bits, wherein the low variable nodes are variable nodes having low error probability values and the high variable nodes are variable nodes having high error probability values in a factor graph of the LDPC codes.

Description

technical field [0001] The present invention relates to mobile communication systems, and more particularly to an apparatus and method for transmitting and receiving encoded data through encoders with unequal error probability values. Background technique [0002] With the introduction of a cellular mobile communication system in the United States in the late 1970s, Korea began to provide voice communication services in an Advanced Mobile Phone Service (AMPS) system, ie, a first generation (1G) analog mobile communication system. In the mid-1990s, South Korea introduced a Code Division Multiple Access (CDMA) system providing voice and low-speed data services, that is, a second generation (2G) mobile communication system to the market. [0003] In the late 1990s, South Korea partially deployed the IMT-2000 (International Mobile Telecommunications-2000) system aimed at providing advanced wireless multimedia services, global roaming, and high-speed data services, that is, third...

AI Technical Summary

Problems solved by technology

[0012] However, it is difficult to devise a design that provides unequal error probabilities to typical linear block codes using conventional non-iterative decoding weighted to a minimum distance

That is, each bit of a typical block code has almost the same probability of error value, and it is extremely difficult to design an encoder that can encode transmitted bits with different probability of error values

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