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Iterative demapping and decoding method and iterative demapping and decoding system

A mapping decoding and iterative solution technology, applied in transmission systems, digital transmission systems, electrical components, etc., can solve the problems of limited throughput, high complexity, low computing efficiency, etc. low effect

Active Publication Date: 2013-07-03
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0033] The technical problem to be solved by the present invention is to provide an iterative demapping decoding method and system to solve the problems of low operational efficiency, high complexity, and limited throughput capacity faced by the actual system, and greatly improve the iterative demapping decoding system. While improving computing efficiency, the system can achieve a flexible compromise between the complexity of multiple computing units and the system throughput.

Method used

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  • Iterative demapping and decoding method and iterative demapping and decoding system
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  • Iterative demapping and decoding method and iterative demapping and decoding system

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Embodiment 1

[0093] Such as Figure 6 As shown, the present embodiment describes an iterative demapping decoding method for LDPC codes, comprising the following steps:

[0094] S101: Initialize the control unit and each computing unit including the demapper, the variable node decoder VND and the check node decoder CND.

[0095] Wherein, the initialization control unit includes: setting the whole decoding process and the start conditions and stop conditions of each operation unit, and setting the state control mode of each operation unit. The starting conditions of the demapper include but are not limited to the demapper starting to input received symbols and channel state information; the starting conditions of the variable node decoder VND include but not limited to after the variable node decoder VND starts to input the first operation of the demapper The first decoding prior information passed to the variable node decoder VND; the start condition of the check node decoder CND includes ...

Embodiment 2

[0111] like Figure 10 As shown, this embodiment describes an iterative demapping decoding system corresponding to the above method, including:

[0112] The demapper, and the front-end module of the external receiver (to obtain the received symbol containing the channel state information, Figure 10 not shown in), the demapping external information memory ARAM, the first decoding external information memory ERAM and the control unit are connected, and are used to combine the channel state information input from the previous module and the first decoding external information under the control of the control unit The demapping prior information read out by the memory ERAM performs soft demapping operation on the received symbols to obtain demapping information, and writes it into the demapping external information memory ARAM;

[0113] The demapping external information memory ARAM is connected with the demapper, the variable node decoder VND and the control unit, and is used t...

Embodiment 3

[0122] It can be seen from the traditional LDPC iterative decoding process that the CND decoding operation of the check node decoder and the VND decoding operation of the variable node decoder are always executed alternately in series, that is, in the check node decoder CND (or the variable node decoder VND ) operation completes one iteration (that is, updates all node soft information), the variable node decoder VND (or check node decoder CND) performs operations with all updated input information. Similar to the (3) state control mode in Embodiment 1, this embodiment, as an extension of Embodiment 1, provides an iterative demapping decoding method, which is characterized in that the demapper operates in parallel, and each operation can only be completed Partial iteration, while the variable node decoder VND and the check node decoder CND are serially and alternately operated, and each operation must complete a complete iteration. like Figure 11 As shown, the iterative dema...

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Abstract

The invention discloses an iterative demapping and decoding method and an iterative demapping and decoding system. The iterative demapping and decoding method comprises the following steps: step 1, a control unit and arithmetic units are initialized, wherein the arithmetic units comprise a demapper, a variable node decoder and a check node decoder; step 2, when the demapper reaches a starting condition, decoding procedures are started by the control unit; step 3, the decoding procedures are operated under the control of the control unit, at least part of the arithmetic units executes respective operation concurrently; and step 4, when a decoding stop condition is reached, the decoding procedures are stopped by the control unit, and code words of decoding results are output. The iterative demapping and decoding system comprises the control unit, a storer, the demapper, the variable node decoder and the check node decoder for achieving the method. The iterative demapping and decoding method and the iterative demapping and decoding system can solve the problems that operating efficiency is low, complexity is high, handling capacity is limited and the like in an actual system.

Description

technical field [0001] The invention relates to the technical field of digital information transmission, in particular to an iterative demapping decoding method and system. Background technique [0002] One of the fundamental tasks of digital communication systems, including typical wireless mobile communication systems and terrestrial digital broadcasting systems, is to realize efficient and reliable transmission of digital information. Using channel coding for error control is an effective method and means to realize this fundamental task. In order to meet the transmission requirements of digital information in the common analog channel environment, channel coding technology usually needs to be combined with digital modulation technology. The coded modulation system composed of channel coding and modulation is a subsystem of the digital communication system transmitter and one of its core modules. The corresponding coded modulation technology is the core technology of the...

Claims

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Application Information

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IPC IPC(8): H04L1/00
Inventor 彭克武刘在爽宋健潘长勇杨知行
Owner TSINGHUA UNIV
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