Low-complexity demapping algorithm for cross constellation QAM (Quadracture Amplitude Modulation) in G. HN (G. home Network) standard

A low-complexity, demapping technology, applied in the transmitter/receiver shaping network, baseband system components, multi-carrier systems, etc., can solve the QAM simplification algorithm without considering the high-order cross constellation QAM demodulation difficulties And other issues

Inactive Publication Date: 2014-04-02
CHANGAN UNIV
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Problems solved by technology

[0008] Documents 1 to 4 all study the QAM demapping algorithm for square constellations. Although Document 5 studies the demodulation technology of cross constellations,

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  • Low-complexity demapping algorithm for cross constellation QAM (Quadracture Amplitude Modulation) in G. HN (G. home Network) standard
  • Low-complexity demapping algorithm for cross constellation QAM (Quadracture Amplitude Modulation) in G. HN (G. home Network) standard
  • Low-complexity demapping algorithm for cross constellation QAM (Quadracture Amplitude Modulation) in G. HN (G. home Network) standard

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Embodiment

[0104] Usually, in order to improve system performance, channel coding is effectively combined with high-order modulation techniques. The present invention takes the QC-LDPC code in G.HN as an example, its information bit length is 960, the code rate is 1 / 2, the decoding algorithm adopts the Layered TDMP algorithm, 8 iterations, and the maximum number of simulation frames is 10 6 .

[0105] figure 1 Combined with the distribution characteristics of the constellation diagram, three situations of the received signal relative to the reference constellation points are given, which are represented by different shading patterns. Constellation points with slash shading correspond to the situation outside the constellation diagram; constellation points with square shading correspond to the situation on the shoulder of the constellation diagram; constellation points without shading correspond to other situations.

[0106] figure 2is the overall constellation diagram of 128-QAM. Th...

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Abstract

The invention discloses a low-complexity demapping algorithm for cross constellation QAM (Quadracture Amplitude Modulation) in a G. HN (G. home Network) standard. The algorithm is used for reducing the demapping complexity of high-ranking cross constellation QAM in the G. HN standard, expanding the application scenes of the high-speed data transmission of the high-ranking cross constellation QAM, measuring the contribution of reference constellation points to demapping through contribution weight, and narrowing search scopes to the reference constellation points with large contribution weight, so as to effectively lowering demapping complexity of the high-ranking cross constellation QAM. The algorithm can make full use of channel estimation information, and assist self-adaptation to choose the search scopes, thereby narrowing down the search scopes, effectively reducing the demapping complexity of the high-ranking cross constellation QAM, reaching favorable balance between algorithm complexity and performance, and laying the foundation for expanding the application scenes of the high-ranking cross constellation QAM.

Description

technical field [0001] The invention relates to a cross-constellation QAM low-complexity demapping algorithm in the G.HN standard. Background technique [0002] Modulation and demapping technology is a core technology of the communication system, which has a decisive impact on the performance of the communication system. The task of QAM de-mapping is to calculate the best estimate of the transmitted data, and the output of de-mapping can be hard-decision digital bits, or an effective measurement value of soft-decision digital bits at the sending end. Generally, soft-decision demapping and channel decoding (such as Turbo code, LDPC, etc.) work together to further reduce the bit error rate of transmission based on the principle of minimizing the influence of channel noise. [0003] Document 1 "Comparison of Soft Output Algorithms for High-order Modulation [Journal of Beijing University of Posts and Telecommunications, 2003, 26(1): 82-85]" studied the LogMap algorithm and simp...

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Application Information

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IPC IPC(8): H04L27/34H04L25/03
Inventor 徐娟姚如贵朱礼亚南花妮高凡琪
Owner CHANGAN UNIV
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