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Joint demodulation and decoding method for convolutionally encoded Gaussian frequency shift keying (GFSK) signals

A technology of convolutional coding and convolutional coding, which is applied in the field of joint demodulation and decoding of Gaussian frequency shift keying signals, can solve problems such as high coding gain, and achieve the effect of low complexity and simplified calculation.

Active Publication Date: 2018-11-23
SHANGHAI HUAHONG INTEGRATED CIRCUIT
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Problems solved by technology

This method is simple to implement, however, it is difficult to achieve high coding gain with the hard decision of GFSK signal

Method used

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  • Joint demodulation and decoding method for convolutionally encoded Gaussian frequency shift keying (GFSK) signals
  • Joint demodulation and decoding method for convolutionally encoded Gaussian frequency shift keying (GFSK) signals
  • Joint demodulation and decoding method for convolutionally encoded Gaussian frequency shift keying (GFSK) signals

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Embodiment Construction

[0043] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0044] The original information data of the transmitter undergoes convolution coding and bit pattern mapping before transmission, and redundant data is added to the transmission data; after that, the data is transmitted through GFSK modulation. The receiver converts the RF GFSK signal into a baseband signal through the RF front end, and after joint demodulation and Viterbi decoding, the original information data is directly decoded from the baseband signal. figure 1 Shown is a block diagram of a convolutionally coded GFSK transmitter and receiver. The convolutional encoder is a convolutional code defined in the Bluetooth Low Energy 5.0 standard; figure 2 Shown is the structural diagram of the convolutional code encoder; the constraint length of the convolutional code is 4, and the code rate is 1 / 2; image 3 The state transition diagram of th...

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Abstract

The invention, which relates to the field of wireless communication technologies, discloses a joint demodulation and decoding method for convolutionally encoded Gaussian frequency shift keying (GFSK)signals. Approximating processing is carried out on phases of GFSK signals and the phase interference between adjacent symbols is neglected, so that the path metric calculation is simplified and thusthe computational complexity of the path metric is reduced. According to a grid diagram of a convolutional code, a path metric of each surviving path is calculated based on a surviving path processingmethod. For each surviving path, one path metric and a coded sequence sum corresponding to the surviving path are kept, wherein the coded sequence sum is used for constructing a transmitting GFSK signal on the branch; correlation values a received signal and a corresponding transmitted signal on the branch are calculated to obtain a branch metric of the branch. With the joint demodulation and decoding method provided by the invention, the coded gain of the convolutional code is realized; and compared with the GFSK signal hard decision separation demodulation and decoding method, the joint demodulation and decoding method has the obvious performance gain.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a method for joint demodulation and decoding of convolutionally coded Gaussian frequency shift keying (GFSK) signals. Background technique [0002] Gaussian frequency shift keying (GFSK) is a common wireless transmission technology, and the phase of the modulated signal is continuous. The transmitted data symbols first pass through a Gaussian filter; then frequency modulation is performed, so that the conversion between the two different frequencies corresponding to the data symbols +1 and -1 is continuous, reducing the spectral bandwidth of the modulated signal. In addition, the GFSK signal belongs to the constant envelope modulation, thus reducing the linearity requirement of the transmitter on the power amplifier. In systems such as Classic Bluetooth, Bluetooth Low Energy, and GSM mobile communication, GFSK has been widely used. [0003] In order to further improve the ...

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Application Information

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IPC IPC(8): H04L27/14H03M13/23
CPCH03M13/235H04L27/14
Inventor 车小林
Owner SHANGHAI HUAHONG INTEGRATED CIRCUIT
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