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Low complexity, high performance GFSK signal multi-bit demodulation method

A low-complexity, high-performance technology, applied in the direction of frequency modulation carrier system, etc., can solve problems such as large amount of computation and long convergence delay

Active Publication Date: 2007-10-03
豪威国际控股有限公司
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Problems solved by technology

The former has to go through a long convergence delay, while the latter still has a large amount of computation

Method used

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  • Low complexity, high performance GFSK signal multi-bit demodulation method

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Embodiment Construction

[0020] The low-complexity, high-performance GFSK signal multi-bit demodulation method of the present invention comprises the following steps: first, the frequency variation form during frequency modulation is converted into a phase variation form:

[0021] When GFSK modulation, the bit stream data {d i}, d i ∈{0, 1} is converted into a non-return-to-zero code with a duration of T, and then shaped into a baseband signal through a Gaussian filter. The shape of the Gaussian response is related to the modulation factor BT. A commonly used factor (as in bluetooth) is 0.5. The baseband waveform can be expressed as formula (1):

[0022] ( t ) = 2 E b T exp ( jφ ( t ) )

[0023]...

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Abstract

This invention provides a simple and high performance multi-bit demodulation method for GFSK signals including the following steps: 1, converting the frequency change form when modulating to a phase change form, 2, using the DPSK modem method in the GFSK demodulation, 3, making parameters concrete to carry out iterative judgment to get the demodulation resut.

Description

technical field [0001] The invention relates to a signal demodulation method, in particular to a GFSK signal multi-bit demodulation method. Background technique [0002] Gaussian Frequency Shift Keying (GFSK) modulation is a bandwidth-saving digital modulation technique, which is widely used in various low-cost transmission standards, such as Bluetooth[1] and DECT. In engineering, GFSK is generally modulated into a continuous phase (CPFSK) form, which can effectively reduce sidelobe leakage. [0003] Various demodulation methods for GFSK signals have been developed at present. The common ones are Phase-Shift Discriminator, Quadrature Detector, frequency feedback, Zero-Crossing and so on. However, since the GFSK signal is a partial response signal, the intersymbol interference is relatively serious, and compared with BPSK (Binary Phase Shift Keying) and other modulated signals, the intersymbol distance is small, so the performance is relatively poor. In some receivers, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/10
Inventor 何津津崔健杨莲兴
Owner 豪威国际控股有限公司
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