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Four-dimensional rotating constellation de-mapping method based on joint posterior probability

A technology of rotating constellation and a posteriori probability, applied in the direction of transmission modification based on link quality, digital transmission system, electrical components, etc., can solve the problem of not clearly proposed demapping method and so on

Inactive Publication Date: 2015-04-29
XIDIAN UNIV
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Problems solved by technology

In the existing literature related to this method, the corresponding demapping method is not clearly proposed. Therefore, the present invention proposes a four-dimensional rotation demapping method based on the joint posterior probability for the four-dimensional rotation constellation.

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  • Four-dimensional rotating constellation de-mapping method based on joint posterior probability
  • Four-dimensional rotating constellation de-mapping method based on joint posterior probability
  • Four-dimensional rotating constellation de-mapping method based on joint posterior probability

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Embodiment Construction

[0057] The present invention will be described in detail below in combination with specific embodiments.

[0058] The invention discloses a four-dimensional rotating constellation demapping method based on a maximum a posteriori algorithm, which mainly solves the problem of four-dimensional rotating constellation demapping introduced in the DVB-NGH system. The implementation steps are: the transmitting end performs QPSK modulation on the input bit stream to obtain the modulated signal; performs four-dimensional rotation on the modulated signal to obtain the rotated signal; performs I / Q component interleaving on the rotated signal to obtain the final transmitted signal; The estimated signal is obtained by zero-forcing detection; the I / Q component deinterleaving is performed on the estimated signal, and the log likelihood ratio is obtained by combining the maximum a posteriori algorithm and the joint probability of adjacent symbols; finally, the final estimated bit information is...

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Abstract

The invention discloses a four-dimensional rotating constellation de-mapping method based on joint posterior probability. A sending send carries out quadrature phase shift keying mapping on an input bit stream to obtain the kth pair of adjacent modulation signals; real parts and imaginary parts of the kth pair of modulation signals are combined and multiplied by a quadrature rotating matrix P to obtain corresponding rotating signals; I / Q component interleaving is carried out on the rotating signals, a receiving end calculates channel coefficients and estimation symbols, I / Q component de-interleaving is carried out, all components and corresponding channel coefficients of the rotating signals are obtained, and the log-likelihood ratio (LLR) of each sent bit is calculated; and the finally-estimated bit information is solved in a hard decision mode. The method has the advantages that information of one symbol is distributed to four dimensions, and the correct demodulation probability of the receiving end can be greatly increased.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and relates to a four-dimensional rotating constellation demapping method based on joint posterior probability. Background technique [0002] In traditional QAM constellation mapping, the I component (real part) and the Q component (imaginary part) each carry half of the information of the entire symbol. When a constellation symbol suffers a fading event, the I and Q components will fade simultaneously, and if a deep fading is encountered, it is basically impossible for the symbol to be recovered. If each constellation symbol is rotated by a certain angle, so that the I and Q components contain all the information of the corresponding symbol, then the probability of correct demodulation at the receiving end will greatly increase. This method is the second generation of digital video broadcasting standard (DVB- The two-dimensional rotation constellation employed in T2). The starti...

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Application Information

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IPC IPC(8): H04L1/00
CPCH04L1/0015H04L1/1861
Inventor 宫丰奎陈翔杨娜张南
Owner XIDIAN UNIV
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