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Signal mapping and de-mapping method for wireless communication system

A wireless communication system and demapping technology, applied in the field of wireless communication, can solve problems such as increased bit error rate, wrong bit, and decreased signal transmission performance of the wireless communication system, so as to reduce the bit error rate, lower transmission power, and improve signal transmission performance effect

Inactive Publication Date: 2012-08-01
SHENZHEN TINNO WIRELESS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the small distance between the constellation points in the two-dimensional constellation diagram, once the deviation of the received signal increases during the demapping of the two-dimensional map, it is easy to misjudge the constellation points around the actual sending constellation point as the actual sending constellation point, resulting in erroneous bits, resulting in an increase in the bit error rate and a decrease in the signal transmission performance of the wireless communication system

Method used

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  • Signal mapping and de-mapping method for wireless communication system
  • Signal mapping and de-mapping method for wireless communication system
  • Signal mapping and de-mapping method for wireless communication system

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Embodiment 1

[0060] Orthogonal Frequency Division Multiplexing (OFDM) is the main representative of the block transmission frequency domain equalization system. It has attracted great attention due to its remarkable advantages such as high spectral efficiency, strong anti-multipath fading ability, and simple equalization. One of the main supporting technologies for future broadband wireless communications. The signal mapping and demapping method of the present invention is applied to the OFDM system, and the transmission performance gain obtained by the method of the present invention is illustrated through simulation.

[0061] Using the OFDM system to simulate the performance under AWGN (additive white Gaussian noise model) and multipath channel (SUI-3), assuming that the receiver can achieve accurate synchronization and perform ideal channel estimation, the multipath channel adopts the SUI-3 channel model , the specific system simulation parameters are: the symbol rate is 5M symbols / s, t...

Embodiment 2

[0066] Single carrier frequency domain equalization technology (SC-FDE) is also a block transmission technology, by introducing a cyclic prefix (CP) or a special code word (UW), the linear convolution effect of the multipath channel on the signal in the discrete time domain Converted to circular convolution, the time-domain circular convolution corresponds to the product of the signal and the channel in the frequency domain, then Fourier transform can be used to eliminate the inter-symbol interference caused by multi-path propagation, so it has the same Compared with the traditional single-carrier time-domain equalization system, OFDM has similar anti-multipath interference ability, and its equalization complexity is greatly reduced. At the same time, since SC-FDE is a single-carrier transmission system, there is no peak-to-average power ratio (PAPR) problem of a multi-carrier transmission system. The signal mapping and demapping method of the present invention is applied to t...

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Abstract

The invention provides a signal mapping and de-mapping method for a wireless communication system. When the method is used for mapping, a signal bit stream is three-dimensionally mapped to obtain a three-dimensional symbol of a signal bit group corresponding to a three-dimensional constellation point, and then the three-dimensional symbol is converted into a two-dimensional symbol for transmitting; and when the method is used for de-mapping, the two-dimensional symbol is reversed into a three-dimensional symbol, and a three-dimensional constellation point which is closest to the three-dimensional symbol is searched in a three-dimensional constellation image to determine a demodulation bit group of a received signal. Since Euclid distances among three-dimensionally mapped constellation points are greater than those among conventional two-dimensionally mapped constellation points, the method contributes to further reducing error rate, brings higher transmission performance, realizes lower transmitting power and is very suitable for a system needing low-power transmission.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to modulation and demodulation technology in a wireless communication system, and is a signal mapping and demapping method of a wireless communication system. Background technique [0002] The wireless communication system can be divided into three basic components: the signal sending end, the wireless communication transmission channel and the signal receiving end; among them, the signal sending end includes a signal source module, a modulation module, a D / A conversion module, etc., and the signal receiving end includes an A / D conversion module, demodulation module, etc. The block diagram of the wireless communication system is as follows: figure 1 As shown, its signal processing and transmission process includes: the signal source module generates a binary signal data stream in bit form, that is, the signal bit stream; the modulation module maps the signal bit str...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/06H04L25/03H04L27/26
Inventor 仲元红李瑾刘晓明黄智勇熊东吴皓威刘莎
Owner SHENZHEN TINNO WIRELESS TECH
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