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A Gaussian frequency shift keying (GFSK) signal demodulation method with low complexity based on decision feedback

A technology of decision feedback and demodulation method, which is applied in the direction of baseband system, FM carrier system, baseband system components, etc., can solve the problems affecting demodulation performance, etc., and achieve the effect of low complexity, reduced area and power consumption

Active Publication Date: 2018-12-18
SHANGHAI HUAHONG INTEGRATED CIRCUIT
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Problems solved by technology

He Jinjin et al. designed a non-coherent maximum likelihood demodulation method[4][5], which significantly improved the performance of the receiver; however, the demodulation process requires iterative calculations, and the selection of the iterative factor will affect the demodulation performance

Method used

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  • A Gaussian frequency shift keying (GFSK) signal demodulation method with low complexity based on decision feedback
  • A Gaussian frequency shift keying (GFSK) signal demodulation method with low complexity based on decision feedback
  • A Gaussian frequency shift keying (GFSK) signal demodulation method with low complexity based on decision feedback

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Embodiment Construction

[0039] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0040] Step 1. According to the expression of the GFSK signal, approximate the phase of the GFSK signal, ignoring the phase interference between adjacent symbols, and obtain a simplified expression of the GFSK signal.

[0041] The complex baseband form of the GFSK modulated signal can be expressed as

[0042]

[0043]

[0044] where E b is the energy per bit of information; T is the symbol period; h is the GFSK modulation index, 0.45≤h≤0.55 in BLE, usually choose h=0.5; α(k) is the transmitted data symbol, α(k)∈{-1 , +1} is the mapping of the transmitted binary information sequence; q(t) is the integral of the Gaussian pulse, and its expression is as follows

[0045]

[0046]

[0047] in BT is the product of the bandwidth and the symbol, BT=0.5 in BLE, and B is the -3dB bandwidth of the Gaussian pulse. The waveform of g(t) is as...

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Abstract

The invention relates to the technical field of wireless communication and discloses a Gaussian frequency shift keying (GFSK) signal demodulation method with low complexity based on decision feedback.According to the expression of GFSK signal, the phase of GFSK signal is approximated, and the phase interference between adjacent symbols is ignored, so the simplified expression of GFSK signal is obtained. Based on the principle of decision feedback, in the current sampling value of the received signal, the detected symbols are canceled to obtain the signal related to the current transmitted data symbols. On the basis of the signal, the data symbols transmitted by the current signal are judged. Compared with the traditional difference demodulation, the decision feedback difference demodulation and the maximum likelihood incoherent demodulation, the GFSK demodulation method of the invention has higher performance, and only two multiplications are required for computational complexity; When the modulation index of the GFSK signal is 0.5, the GFSK demodulation method of the invention does not need multiplication calculation, and directly decides the data symbol according to the real part or the imaginary part of the GFSK signal; Therefore, the GFSK demodulation method of the present invention is very suitable for digital integrated circuit implementation.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a demodulation method of a Gaussian Frequency Shift Keying (GFSK) signal based on decision feedback and low complexity. Background technique [0002] Gaussian Frequency Shift Keying (GFSK) is a continuous phase frequency modulation. Different from the usual frequency modulation, when GFSK is modulated, the transmitted data symbols are passed through a Gaussian filter; in this way, the conversion between two different frequencies is continuous, thereby limiting the spectral bandwidth of the modulated signal. The amplitude of the GFSK signal is constant, which can significantly reduce the linearity requirement of the transmitter on the power amplifier. GFSK modulation is widely used in low-power transmission and IoT fields, such as Bluetooth (Bluetooth), Bluetooth Low Energy (Bluetooth Low Energy, BLE) [1], etc. [0003] GFSK demodulation method is a key technology of digita...

Claims

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Application Information

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IPC IPC(8): H04L25/03H04L27/14
CPCH04L25/03267H04L27/14
Inventor 车小林
Owner SHANGHAI HUAHONG INTEGRATED CIRCUIT
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