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Soft solution mapping method

A soft demapping and constellation mapping technology, applied in the field of soft demapping, can solve the problems of high computational complexity, large amount of calculation, inconvenient hardware implementation, etc., and achieve the effect of improving computing speed, small performance loss, and reducing resources

Inactive Publication Date: 2012-10-03
TSINGHUA UNIV +1
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Problems solved by technology

However, when the order of the constellation diagram is very high, the amount of calculation is still relatively large
[0030] Although the existing soft demapping scheme for constellation mapping is relatively accurate, it has high computational complexity and is not convenient for hardware implementation

Method used

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Embodiment Construction

[0052] The soft demapping method proposed by the present invention is described in detail as follows in conjunction with the accompanying drawings and embodiments.

[0053] In the method of the present invention, the hard decision boundary refers to the decision boundary used when performing hard decisions. The normalized hard decision boundary is the hard decision boundary of the normalized constellation. The normalized hard decision boundary is determined by the constellation diagram and has nothing to do with the channel state. The hard decision boundary of the phase bit is the same as the normalized hard decision boundary.

[0054] In addition, the method of the present invention is used to perform soft demapping at the receiving end of the transmitted signal based on the constellation mapping of the Gray-mapped APSK constellation diagram (hereinafter referred to as Gray-APSK constellation mapping), and the constellation order of the Gray-APSK constellation diagram is M=...

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Abstract

The invention discloses a soft solution mapping method, and relates to the technical field of digital information transmission. The method comprises the following steps of: calculating an amplitude and a phase of a received sign; performing soft solution mapping on an amplitude bit in the received sign according to channel state information and a hard judgment boundary of the received sign, so as to obtain a log-likelihood ratio of the amplitude bit; and performing the soft solution mapping on a phase bit in the received sign according to the channel state information and the hard judgment boundary of the received sign, so as to obtain a log-likelihood ratio of the phase bit, wherein the amplitude bit is a bit which is only related to the amplitude in the received sign; and the phase bit is a bit which is only related to the phase in the received sign. According to the method, an Euclidean distance between each bit and the hard judgment boundary is calculated; the calculation complexity is O (log M); the operation complexity is simplified; the performance loss of a system is extremely low; the resource consumption of hardware is reduced; and the calculation speed is increased.

Description

technical field [0001] The invention relates to the technical field of digital information transmission, in particular to a soft demapping method. Background technique [0002] One of the fundamental tasks of digital communication systems, including typical wireless mobile communication systems and terrestrial digital broadcasting systems, is to realize the error-free transmission of digital information. Using channel coding for error control is the most effective method and means to realize this fundamental task. In order to meet the transmission requirements of digital information on common analog channels, channel coding technology usually needs to be combined with digital modulation technology. The combination of channel coding and modulation constitutes a coded modulation system, which is a subsystem of the digital communication system transmitter and one of its core modules, and the corresponding coded modulation technology is also the core technology of the digital c...

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Application Information

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IPC IPC(8): H04L27/38
Inventor 潘长勇黄嘉晨彭克武谢求亮
Owner TSINGHUA UNIV
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