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Constellation mapping method based on absolute phase shift keying (APSK) constellation map, coded modulation method and system

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

Active Publication Date: 2012-10-24
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Forney and Gallager proposed the concept of Shaping for the first time, and pointed out that there is a gap of 1.53dB between the coded modulation system using the equal probability mapping QAM constellation diagram and the channel capacity at high spectral efficiency

Method used

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  • Constellation mapping method based on absolute phase shift keying (APSK) constellation map, coded modulation method and system
  • Constellation mapping method based on absolute phase shift keying (APSK) constellation map, coded modulation method and system
  • Constellation mapping method based on absolute phase shift keying (APSK) constellation map, coded modulation method and system

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Embodiment 1

[0095] APSK constellation diagram design method with Gray mapping, the key lies in the parameter m 1 and m 2 (m 1 and m 2 Both are positive integers) and the determination of the radius, where, for a Gray map of 2 m - APSK constellation diagram, with m 1 +m 2 = m, m, m 1 and m 2 are positive integers, so m 1 and m 2There are a total of m-1 combinations. The optimal parameters should make the CM-AMI and BICM-AMI corresponding to APSK constraints as large as possible. In addition, in this embodiment, the radius of the lth ring is preferably In traditional constellation diagram design, the minimum Euclidean distance d between constellation points is always desired min maximization, unfortunately this is not guaranteed to have a large BICM-AMI. In the present invention, a larger BICM-AMI corresponds to a larger harmonic mean Euclidean square distance and:

[0096] 1 d ¯ 2 ...

Embodiment 2

[0105] This embodiment provides a coding, modulation, demodulation and decoding method using gray-mapped APSK constellation diagrams, wherein the receiving end uses an independent demapping algorithm. Such as Figure 7 As shown, the encoding modulation and demodulation decoding method comprises steps:

[0106] sender:

[0107] S201. The information bits to be transmitted {s k} Carry out FEC encoding on the finite field;

[0108] S202. Encoding the above FEC bits {s k} for bit interleaving to get interleaved bits {b k};

[0109] S203. Interleave bits {b k} After gray-mapped APSK constellation mapping, the constellation mapping symbol {x} is obtained and sent to the channel;

[0110] Receiving end:

[0111] S204. Perform constellation demapping on the received signal {y} to obtain the demapped log likelihood ratio LLR soft information;

[0112] S205. Deinterleaving the log likelihood ratio above to obtain {L k} and sent to the decoder;

[0113] S206. Based on {L k}, ...

Embodiment 3

[0133] This embodiment provides a coding, modulation, demodulation and decoding method using gray-mapped APSK constellation diagrams, wherein the receiving end uses an iterative demapping algorithm. Such as Figure 12 As shown, the encoding modulation and demodulation decoding method comprises steps:

[0134] sender:

[0135] S301. The information bits to be transmitted {s k} Carry out FEC encoding on the finite field;

[0136] S302. Encoding the above FEC bits {s k} for bit interleaving to get interleaved bits {b k};

[0137] S303. Interleave bits {b k} After gray-mapped APSK constellation mapping, the constellation mapping symbol {x} is obtained and sent to the channel;

[0138] Receiving end:

[0139] S304. Based on the prior information fed back in step S307, perform constellation demapping on the received signal {y}, and obtain the demapped log likelihood ratio LLR soft information;

[0140] S305. Deinterleaving the log likelihood ratio above to obtain {L k} and s...

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Abstract

The invention discloses a constellation mapping method based on an absolute phase shift keying (APSK) constellation map. The constellation mapping method is characterized in that the order M of an APSK constellation is equal to 2<m>; the number n1 of points on each ring is equal to a value of powers to 2, namely n1=2<m1>, the number n1=2<m1>-PSK (phase shift keying), the number of rings R=2<m2>, and a set consisting of different ring radiuses is a special 2<m2>-PAM(pulse amplitude modulation ), wherein m1+m2=m; and the phase deflection theta1 of all the rings are the same. The method comprises the following steps of: B1, for a bit vector which is m in length, setting m1 bits to be only related to the phase, and adopting PSK Gray mapping between the m1 bits and the 2<m1>-PSK; and B2, setting the rest m2 bits to be only related to the amplitude, and adopting PAM Gray mapping between the m2 bits and the 2<m2>-PAM. The invention has the advantages that compared with the conventional coded modulation system adopting quadrature amplitude modulation (QAM) constellation map mapping, the coded modulation system adopting the APSM constellation map Gray mapping can acquire a considerable error control performance gain regardless of adopting independent demapping or iterative demapping by a receiving end.

Description

technical field [0001] The invention relates to the field of digital information transmission, in particular to a constellation mapping method based on an APSK constellation diagram, a coding and modulation method and a system. Background technique [0002] The communication system includes a typical two-way communication system and a one-way broadcast system, and its fundamental task is to realize the error-free transmission of information. A digital communication system is a communication system using digital technology. Compared with an analog communication system, a digital communication system can reliably transmit a higher information rate. Forward Error Control (FEC) coding is one of the core technologies in digital communication systems and one of the most important means to ensure transmission reliability. In order to meet the transmission requirements of digital information in common channels, usually the finite field FEC coding technology needs to be combined wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/36H04L1/00
Inventor 杨知行谢求亮刘在爽彭克武宋健
Owner TSINGHUA UNIV
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