A Design Method for 16qam Mapping of Tricyclic Structure in Bicm-id System

A design method and technology of a mapping scheme, applied in the field of signal processing, can solve the problems of increasing system complexity, intractability, and high complexity, and achieve the effects of reliable soft demodulation information, large decision area, and excellent bit error performance.

Active Publication Date: 2019-12-13
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, most of the mapping schemes need to be calculated using a cost function with a large amount of calculation, which increases the complexity of the system, and the search of high-order signal constellations suitable for BICM-ID systems by computer becomes difficult due to its high complexity

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  • A Design Method for 16qam Mapping of Tricyclic Structure in Bicm-id System
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  • A Design Method for 16qam Mapping of Tricyclic Structure in Bicm-id System

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[0022] The specific implementation manners and preferred simulation examples of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0023] 1. Combine with attached figure 2 It shows that in the BICM-ID system, through ideal interleaving, the symbols that make up the same modulation symbol are independent of each other, and the effective free distance (EFD) of the signal point can be maximized through the ideal information feedback of other symbols. System performance at high signal-to-noise ratios can thus be improved. Depend on figure 2 It can be seen that the source bit sequence with a length of k passes through an encoder with a code rate of R=k / n to obtain a codeword with a code length of n, and then after bit interleaving, the interleaved sequence is mapped according to different modulation modes to M (M=2 m ,m=1,2,3...) order constellation diagram χ on a constellation point s k , the final symbol transmitted in t...

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Abstract

The invention relates to a tricyclic-16QAM (Quadrature Amplitude Modulation) mapping design scheme of a novel tricyclic-structure in a bit-interleaved coded modulation iterative demodulation / decoding (BICM-ID) system. The scheme aims to improve the effectiveness and the reliability of the BICM-ID system, and on the basis of an Euclidean distance principle, the 16 quadrature amplitude modulation (16QAM) mapping design scheme is optimized with the combination of min-square European weight (MSEW) principles and bit-minimum decision region maximization principles. Simulation results show that the channel capacity of the scheme is larger than those of schemes of classical Gray mapping, set partition (SP) mapping and mixed set partition (MSP) mapping, and the scheme has relatively good effectiveness and relatively good reliability; in addition, the decoding performance of a low-density parity check code combined with the BICM-ID system is relatively well matched with the tricyclic-16QAM mapping scheme, and the scheme has relatively good error bit performance theoretically.

Description

technical field [0001] The invention belongs to the field of signal processing, and relates to a bit-interleaved coding modulation iterative decoding (BICM-ID) system in wireless communication, in particular to a 16QAM mapping design method of a three-ring structure in the BICM-ID system. Background technique [0002] The purpose of communication is to use as little bandwidth and power resources as possible to transmit information reliably in an environment with interference and noise. Bandwidth-saving Bit-interleaved Coded Modulation Iterative Demodulation / Decoding (BICM-ID) scheme is one of the key technologies in future wireless communication systems. The BICM-ID technology, which uses demodulation information and decoding information to jointly iterate, is mainly used to improve the decoding performance of the BICM system encoded by convolutional codes under Additive White Gaussian Noise (AWGN) channel. [0003] For the BICM-ID system, the design of the mapping method d...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/34
CPCH04L27/3416H04L27/3444
Inventor 袁建国汪哲孙雪敏张锡若汪政权曾晶
Owner CHONGQING UNIV OF POSTS & TELECOMM
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