Method for softly demodulating Gray-mapping pulse amplitude modulation (PAM) signal

A technology of gray mapping and soft demodulation, applied in digital transmission system, electrical components, error prevention, etc.
CN102420677AInactive Publication Date: 2012-04-18NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Publication Date
2012-04-18
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a method for softly demodulating a Gray-mapping pulse amplitude modulation (PAM) signal. The method comprises the following steps of: converting soft information between second-highest-bit soft information and lowest-bit soft information into highest-bit soft information; and calculating the highest-bit soft information by using a nonlinear approximation function.
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Description

technical field

[0001] The invention relates to the field of computer and communication, in particular to a soft demodulation method of Gray mapping PAM signal. Background technique

[0002] PAM (Pulse Amplitude Modulation) is a commonly used modulation method in wireless communication. The Gray mapped constellation indicates that the mapped constellation is coded according to the Gray code, which ensures that the mapped constellation is symmetrical and that only one code element is different between adjacent constellation points. Compared with other constellations, the gray map constellation has a lower bit error rate for the same symbol error rate.

[0003] In order to make full use of the information of the received signal for error correction decoding, the demodulator should provide the decoder with soft decision information that can reflect the probability of the received bit, generally using the log-likelihood ratio (LLR, Log-Likelihood Ratio) of the received bit To ...

Claims

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