8APSK mapping scheme for LDPC-BICM-ID system

A technology of LDPC-BICM-ID and mapping scheme, which is applied in the field of LDPC coding joint iterative demodulation and decoding system, and can solve the problems such as the gain effect is not obvious

Active Publication Date: 2019-04-23
SHANXI UNIV
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Problems solved by technology

[0004] In 2017, Yuan Jianguo et al. proposed a (2,6)-scheme mapping scheme in "A Novel 8APSK Mapping Scheme for BICM-ID System", which shows through simulation that (2,6)-scheme is in the joint LDPC In the BICM-ID system of the code, better bit error rate performan

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  • 8APSK mapping scheme for LDPC-BICM-ID system
  • 8APSK mapping scheme for LDPC-BICM-ID system
  • 8APSK mapping scheme for LDPC-BICM-ID system

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[0047] Below in conjunction with accompanying drawing and example the present invention will be further described:

[0048] figure 1 It is a diagram of the LDPC-BICM-ID system model built based on the mapping scheme provided by the present invention. The model is composed of an LDPC encoder and decoder, a bit interleaver and deinterleaver, and an 8APSK modulator and demodulator. The LDPC code length is 16200, the code rate is 8 / 9, and the mapping scheme of 8APSK modulation adopts the 3-5-scheme 8APSK mapping scheme provided by the present invention, the interleaver uses random interleaving, and the demodulation mode uses the Max-Log-MAP method. The coding method uses the BP decoding algorithm based on the logarithmic domain. The number of external iterations between the demodulator and the decoder is 10, and the number of internal iterations in the decoder is 16. The channel model is an additive white Gaussian noise channel.

[0049] figure 2 The constellation structure dia...

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Abstract

The present invention relates to the field of communication modulation constellation mapping, and is particularly suitable for an LDPC coding joint iterative demodulation decoding system. An 8APSK mapping scheme of an LDPC-BICM-ID system constructs a structure consisting of an inner ring and an outer ring on a plane-rectangular coordinate system with a real part as a horizontal axis and an imaginary part as a vertical axis, wherein the outer ring is distributed with five signal points, and the inner ring is distributed with three signal points, and an amplitude of each signal point is determined by positions of the inner ring and the outer ring where the signal points are located, an angle between a line connecting each signal point and the original point and the positive half axis of thereal axis represents a phase of a modulation signal of the signal. The system can improve spectral efficiency while obtaining coding gain, reliably transmit more information without increasing bandwidth, and can meet requirements of communication quality of wireless communication technology.

Description

Technical field: [0001] The invention relates to the field of communication modulation constellation mapping, and is particularly suitable for LDPC code joint iterative demodulation and decoding systems. Background technique: [0002] The research of DVB-S2 (the second generation standard of satellite digital video broadcasting) shows that better transmission performance can be obtained by using LDPC and 8PSK coded modulation combination in Bit Interleaved Coded Modulation Iterative Decoding (BICM-ID) system. However, as spectrum bandwidth resources become more and more tight, high-order modulation methods combining amplitude and phase should be considered to improve spectrum efficiency. Amplitude Phase Shift Keying (APSK) is more suitable for satellite channel data transmission because of its constellation distribution is circular, the amplitude fluctuation of the modulated signal is small, and the spectrum efficiency is high. Therefore, the 8th-order amplitude phase shift ...

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Application Information

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IPC IPC(8): H04L1/00H04L27/34H04L27/36H04L27/38
CPCH04L1/005H04L1/0061H04L1/0071H04L27/3405H04L27/36H04L27/38
Inventor 付芳焦琦张志才
Owner SHANXI UNIV
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