Gray mapping-based code design method for optimizing Trellis Coded Modulation (TCM) system

A trellis coded modulation and Gray mapping technology, applied in the field of digital signal processing data coding, can solve the problems of complex optimization pairing and limited optimization improvement.

Inactive Publication Date: 2011-01-12
FUDAN UNIV
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Problems solved by technology

However, the article only gives the optimization scheme when the number of states is 4 and 8 under 8PSK modulation. After the code rate is further increased with the increase of the modulation order, for example, the code rate R=3 / 4, 16QAM modulation, the same initial state exists Four pairs of parallel transfer branches, the optimal pairing of the output results {0, 2, 4, 6, 8, 10, 12, 14} is more complicated and the degree of optimization improvement is limited

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  • Gray mapping-based code design method for optimizing Trellis Coded Modulation (TCM) system
  • Gray mapping-based code design method for optimizing Trellis Coded Modulation (TCM) system
  • Gray mapping-based code design method for optimizing Trellis Coded Modulation (TCM) system

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[0049] The encoding method in the present invention is applicable to TCM system design with different number of code rate states and different modulation orders. Different from the traditional coding method that allocates the constellation subset according to the state transition, the present invention allocates the state transition output based on the layout optimization of the Gray map constellation, and it is proved that effective coding gain can be achieved. image 3 Figure 4 Corresponding code rate R=2 / 3, with 4 states, adopts TCM system coding method of 8PSK modulation. Figure 5 Image 6 Corresponding code rate R = 3 / 4, with 8 states, using 16QAM modulation TCM system coding method, the improved coder design scheme further improves the coding gain of about 0.3dB under Gaussian channel compared with the existing scheme. by Figure 5 Image 6 The coding method is a specific example, and the specific implementation steps are described in detail:

[0050] (1) The pre...

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Abstract

The invention belongs to the technical field of digital signal processing data coding, in particular relates to a gray mapping-based code design method for optimizing a Trellis Coded Modulation (TCM) system. In the method, a Euclidean distance parameter and a Hamming distance parameter in coded modulation are considered together, gray planisphere mapping is adopted, and average transfer route output with a maximum Euclidean distance is distributed and a state transfer next state is determined based on the gray planisphere mapping. Therefore, the TCM system is optimized, coding gain is increased and overall performance is improved.

Description

technical field [0001] The invention belongs to the technical field of digital signal processing data coding, and in particular relates to a code modulation criterion and a design method of a TCM system. Background technique [0002] Trellis-Coded Modulation (TCM) is a coded modulation based on convolutional coding. It can effectively use spectral bandwidth to obtain coding gain and is suitable for high-speed signal transmission. It was first proposed by Ungerboeck in 1976 [1]. Compared with traditional convolutional coding, TCM combines coding and modulation, jointly considers the parameters and performance of coding and modulation, reduces extra redundant bits, and maps redundant information to the extended modulation constellation symbol set, in the same symbol At the transmission rate, the coding gain is obtained by increasing the free distance of the encoder. [0003] In recent decades, a lot of work has been devoted to the design of TCM systems, focusing on finding co...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L27/36H04L27/20
Inventor 周晓方沈寅涛王琳凯
Owner FUDAN UNIV
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