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Multidimensional constellation mapping based coding and modulating method, demodulating and decoding method and system

A constellation mapping, coding and modulation technology, which is applied in the fields of coding and modulation methods, demodulation and decoding methods and systems based on multi-dimensional constellation mapping, can solve the problems of poor performance, inability to apply to multiple channels, and insufficient robustness, and achieves improved performance. The effect of diversity order

Active Publication Date: 2011-05-25
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the robustness of the traditional BICM-ID system is not enough, that is, it cannot be applied to a variety of channel transmission conditions. For example, the BICM-ID system with excellent performance in the AWGN channel does not perform well in the fading channel.

Method used

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  • Multidimensional constellation mapping based coding and modulating method, demodulating and decoding method and system
  • Multidimensional constellation mapping based coding and modulating method, demodulating and decoding method and system
  • Multidimensional constellation mapping based coding and modulating method, demodulating and decoding method and system

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Embodiment 1

[0117] Embodiment 1 - BICM-ID system using multi-dimensional constellation diagram

[0118] This embodiment proposes a BICM-ID system using a multi-dimensional constellation diagram according to an implementation manner of the present invention. In order to enable the BICM-ID system to provide performance close to Shannon’s limit in AWGN and fading channels at the same time under medium and low spectral efficiency, this embodiment proposes to use a multi-dimensional constellation diagram with constellation rotation in the BICM-ID coded modulation system, combined with SSD technology.

[0119] like Image 6 Shown is a schematic diagram of the encoding and modulation system and method at the transmitting end of the BICM-ID system:

[0120] S101. Perform channel coding and bit interleaving on the input information bits to obtain coded and interleaved bits;

[0121] S102. Perform K-dimensional pulse amplitude modulation constellation mapping on coded interleaved bits to obtain ...

Embodiment 2

[0138] In order to further demonstrate the performance advantages of the BICM-ID system proposed by the present invention using a multi-dimensional constellation diagram combined with an optimal transformation matrix, this embodiment provides a BICM-ID system using 3D-nPAM with various specific parameters, and Give the bit error performance of the system.

[0139] The coding and modulation method of the system includes steps:

[0140] S301. Perform channel coding and bit interleaving on the input bits to obtain coded and interleaved bits;

[0141] The system uses cascaded channel coding techniques, including parallel cascading and serial cascading technologies. like Figure 8(a) and 8(b)As shown, respectively represent the coding and modulation block diagrams of the transmitting end of the BICM and BICM-ID systems using parallel concatenated and serial concatenated channel coding. Among them, a typical example of parallel concatenated channel coding is a parallel concatena...

Embodiment 3

[0167] In order to further demonstrate the performance advantages of the BICM-ID system using the multi-dimensional constellation diagram combined with the optimal rotation matrix proposed by the present invention, this embodiment provides a BICM-ID system using 4D-nPAM with various specific parameters.

[0168] The encoding and modulation method at the sending end of the system includes steps:

[0169] S401. Perform channel coding and bit interleaving on the input bits to obtain coded and interleaved bits;

[0170] like Figure 10(a) and 10(b) , represent two block diagrams of BICM-ID system coding and modulation at the transmitting end proposed in this embodiment, and use a component code group with parallel features to replace the traditional single component code. System block diagram, Figure 10(b) shows a system block diagram using serial concatenated channel coding. The specific steps of the channel coding and bit interleaving are as follows:

[0171] S401.a encode t...

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Abstract

The invention relates to a multidimensional constellation mapping based coding and modulating method, demodulating and decoding method and system. The coding and modulating method comprises the following steps of: carrying out channel coding and bit interleaving on input information bits to obtain coded interleaved bits; carrying out K-dimensional pulse amplitude modulated constellation mapping on the coded and interleaved bits to obtain a constellation mapping symbol of a K-dimensional real-number vector, wherein K is a positive integer; carrying out constellation rotation on the constellation mapping symbol to obtain a multidimensional rotated constellation mapping symbol of the K-dimensional real-number vector; and carrying out dimension conversion and general real-number interleaving on the multidimensional rotated constellation mapping symbol to obtain a coded and modulated symbol, and outputting the coded and modulated symbol. The method and system in the invention can ensure that the performances of a coding and modulating system and a corresponding demodulating and decoding system approach the channel capacity at medium and low frequency spectrum efficiency under the AWGN (Added White Gaussian Noise) and fading channel conditions and meanwhile, the throughput of the system is taken into consideration.

Description

technical field [0001] The invention relates to the field of digital information transmission, in particular to a coding and modulation method, demodulation and decoding method and system based on multidimensional constellation mapping. Background technique [0002] The fundamental task of digital communication systems, especially wireless communication systems, is to provide high-speed, efficient and error-free transmission of digital information using limited bandwidth. In order to meet the transmission requirements of digital information on common analog channels, channel coding technology usually needs to be combined with digital modulation technology. Coding and modulation technology is an effective method and an important means to realize the fundamental task of the wireless communication system. The combination of channel coding and modulation constitutes a coded modulation system, which is a subsystem of the digital communication system transmitter and one of its co...

Claims

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Application Information

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IPC IPC(8): H04L27/34H04L1/00
Inventor 杨知行谢求亮杨昉彭克武宋健
Owner TSINGHUA UNIV
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