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A new gmsk decoding circuit and decoding method

A technology of decoding circuit and signal conditioning circuit, which is applied in the field of electronic communication to achieve the effects of high reliability, easy debugging and suitable for mass production applications

Active Publication Date: 2018-04-20
TIANJIN 712 COMM & BROADCASTING CO LTD
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention is to solve the problem of how to simplify the GMSK decoding circuit in low-cost simple products, to meet the needs of general communication decoding, and to provide a new GMSK decoding circuit and decoding method to suit different application

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  • A new gmsk decoding circuit and decoding method

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Embodiment Construction

[0011] Such as figure 1 , 2 As shown, a new GMSK decoding circuit is composed of two operational amplifiers and resistors and capacitors. One operational amplifier N1A and peripheral components form a signal conditioning circuit; the other operational amplifier N1B and peripheral components form a signal decoding circuit.

[0012] First, the GMSK modulated radio frequency signal becomes a GMSK modulated baseband signal through the system antenna and the FM demodulation circuit, and then the GMSK modulated baseband signal is input to the GMSK decoding circuit, and the GMSK decoding circuit mediates and decodes the GMSK baseband signal and outputs the decoded number square wave signal.

[0013] The specific circuit connection is: the GMSK modulated baseband signal is connected to the inverting input terminal of the operational amplifier N1A and one end of the resistor R2 through the capacitor C1 and the resistor R1 in turn, and the non-inverting input terminal of the operationa...

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Abstract

The invention relates to a signal decoding circuit and method using a GMSK modulation mode. An operational amplifier N1A and a peripheral element form a signal conditioning circuit, an operational amplifier N1B and a peripheral element form a signal decoding circuit. A GMSK modulation radio frequency signal is converted into a GMSK modulation baseband signal by a system antenna and a frequency modulation demodulation circuit, the GMSK modulation baseband signal is input to a GMSK decoding circuit, and the GMSK decoding circuit demodulates and decodes the GMSK baseband signal and outputs a decoded digital square wave signal. The effects are as follows: a complex and expensive digital signal processing circuit is replaced by the universal operational amplifier and a resistance-capacitance device to solve the GMSK decoding problem very economically and smartly, and miniaturization of the decoding circuit is achieved. The application demands of common communication systems can be satisfied, the system complexity and the overall cost are greatly reduced, and the signal decoding circuit and method are very suitable for portable receivers with low costs.

Description

technical field [0001] The invention relates to the technical field of electronic communication, in particular to a signal decoding circuit and method adopting GMSK modulation mode, that is, a new GMSK decoding circuit and decoding method, and the circuit of the invention can greatly simplify the complexity of the GMSK signal decoding circuit. Background technique [0002] GMSK, or Gaussian Minimum Frequency Shift Keying, is a commonly used digital modulation method in the communication field, such as the GMSK modulation method used in the GSM system. GMSK can improve the frequency spectrum utilization and communication quality of digital mobile communication. The traditional GMSK modulation signal decoding methods mostly use dedicated chips or DSP decoding after digitization. The traditional decoding method has stable performance, but the circuit is more complicated and the cost is relatively high, so it is not suitable for some low-cost simple product applications. Cont...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/14
CPCH04L27/14
Inventor 程树军
Owner TIANJIN 712 COMM & BROADCASTING CO LTD
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