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Code modulation method and system based on APSK constellation mapping

A technology of constellation mapping, coding and modulation, applied in the field of digital information transmission

Inactive Publication Date: 2014-04-30
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a large gap between the information transmission rate under the constraints of the uniform Gray-QAM constellation and the channel capacity limit, which can reach 1.53dB at high spectral efficiency

Method used

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  • Code modulation method and system based on APSK constellation mapping
  • Code modulation method and system based on APSK constellation mapping
  • Code modulation method and system based on APSK constellation mapping

Examples

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Embodiment 1

[0091] This embodiment provides an APSK constellation mapping method.

[0092] In traditional constellation mapping design, the minimum Euclidean distance d between constellation points is always desired min Maximize, so when designing the PSK constellation mapping, the constellation points are usually evenly distributed on the ring. But in fact, under normal SNR and low SNR, evenly distributed PSK constellation mapping cannot guarantee a larger BICM-AMI, and non-uniformly distributed PSK constellation mapping may have a larger BICM-AMI. Similar to PSK, in conventional uniform Gray-APSK, uniform distribution of constellation points on each ring on the ring is usually not an optimal design method, and non-uniform APSK constellation mapping can have better performance. In particular, in the APSK constellation mapping, the constellation points on the ring with a smaller radius have lower energy, that is, the equivalent signal-to-noise ratio is also lower, so the non-uniform dist...

Embodiment 2

[0105] This embodiment is based on the uniform (32×8) 256APSK using Gray mapping, which is called 256Gray-APSK for short, such as Figure 8 As shown; with the goal of maximizing BICM-AMI, a non-uniform 256APSK constellation mapping is obtained for 2 / 3 code rate and AWGN channel optimization, which is called 256APSKa for short, as Figure 9 As shown; for 2 / 3 code rate and Rayleigh channel optimization, the non-uniform 256APSK constellation mapping is referred to as 256APSKr, such as Figure 10 shown. Figure 8 , 9 , 10 also draws a reference line for the phase uniform distribution. The phase modulation factors and radius parameters of 256Gray-APSK, 256APSKa, and 256APSKr are shown in the following table. The radii of each ring in the table have been normalized by power, and the values ​​of phase modulation factors not listed are all equal to zero.

[0106]

[0107] This embodiment provides a coding modulation and decoding demodulation method based on APSK constellation ma...

Embodiment 3

[0130] The encoding and modulation method and system based on APSK constellation mapping proposed in this patent can also be used for multiple-input multiple-output (MIMO) channels.

[0131] Under the MIMO channel, the existing communication system usually still adopts QAM constellation mapping, that is, each transmit antenna is independently modulated by using QAM constellation mapping, and the constellation mapping of each antenna may be the same or different. It is easy to imagine that APSK constellation mapping can also be used to replace traditional QAM constellation mapping in MIMO systems, and the method for designing non-uniform APSK constellation mapping of the present invention can naturally be applied to MIMO systems.

[0132] Consider a n T transmit antennas and n R For a MIMO system with multiple receiving antennas, the channel model can be expressed as

[0133] y = SNR n T...

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Abstract

The invention provides a code modulation method and system based on APSK constellation mapping. The code modulation methodcomprises the following steps that coding bits can be obtained by conducting channel encoding on information bits to be sent, mapping bits can be conducted by conducting the bits mapping on the coding bits, APSK constellation mapping symbols can be achieved by conducting APSK constellation mapping on the mapping bits and sent to a subsequent processing unit; the order of the APSK constellation mapping is M=2m, and the APSK constellation mapping is in a concentric circle ring-shape, the numbers of points on all rings are the same and are the power of 2, namely (img file='DDA0000452526680000011. TIF' wi='232' he='64' / ) equals to (img file='DDA0000452526680000012. TIF' wi=' 248' he='67' / ) cylinder number (img file='DDA0000452526680000013. TIF' wi=' 232' he='61' / ), wherein m1 + m2 = m, and m1, m2 and m are positive integers, each constellation symbol is obtained by mapping a bite vector with the length of m, wherein position of the ring is decided by m2 bits, bits among rings are formed into a Gray map. The performance of the code modulation method and the system based on the APSK constellation mapping is better than the adoption of a conventional homogeneous code modulation system of the APSK constellation mapping in a target signal-noise ratio and a target channel.

Description

technical field [0001] The invention relates to the technical field of digital information transmission, in particular to an encoding and modulation method and system based on APSK constellation mapping. Background technique [0002] Digital communication systems can transmit information at higher rates more reliably than analog communication systems. Coded Modulation (CM) technology, which combines channel coding technology and digital modulation technology, is one of the core technologies of digital communication systems and an important means to improve the transmission reliability and efficiency of digital information. In order to meet the transmission requirements of digital information in common channels and realize efficient and reliable information transmission, it is very important to design high-performance coding and modulation technology. [0003] For typical digital communication systems, constellation mapping is one of the key technologies of digital modulatio...

Claims

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Application Information

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IPC IPC(8): H04L27/36H04L1/00
Inventor 彭克武颜克茜杨昉宋健程涛
Owner TSINGHUA UNIV
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