Communication method based on GMSK modulation and method for detecting fixed frequency

A fixed frequency, communication method technology, applied in the direction of modulated carrier system, digital transmission system, multi-carrier system, etc., can solve the problems of poor transmission performance of GMSK radio frequency channel, influence on base station reception, poor communication quality, etc., to improve signal transmission performance, avoidance of transmission interference, and optimization of communication quality

Active Publication Date: 2016-03-02
SPREADTRUM COMM (SHANGHAI) CO LTD
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Problems solved by technology

[0008] However, the GMSK radio frequency channel will be interfered by the clock signal in the chip, resulting in poor transmission performance of the GMSK radio frequency channel, poor communication quality, and affecting the reception of the base station

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  • Communication method based on GMSK modulation and method for detecting fixed frequency
  • Communication method based on GMSK modulation and method for detecting fixed frequency
  • Communication method based on GMSK modulation and method for detecting fixed frequency

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Embodiment Construction

[0043] In order to make the purpose, features and effects of the present invention more obvious and understandable, the specific implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0044] Many specific details are set forth in the following description to facilitate a full understanding of the present invention, but the present invention can also be implemented in other ways than described here, so the present invention is not limited by the specific embodiments disclosed below.

[0045] It is known based on the prior art that in the GSM cellular mobile communication system, services are divided into voice services and data services. In wireless transmission, both the voice service and the data service adopt the GMSK modulation method. GMSK modulation has the advantages of constant envelope and small out-of-band radiation, which meets the needs of voice services and some low-speed data services, but...

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Abstract

The invention relates to a communication method based on GMSK modulation and a method for detecting a fixed frequency. The communication method based on GMSK modulation comprises the steps of performing GMSK modulation on an input signal for obtaining a first modulated signal; transmitting the first modulated signal through a channel with a preset frequency, wherein if the preset frequency is the fixed frequency, transmitting through a 8PSK channel with the preset frequency, and if the preset frequency is the frequency except for the fixed frequency, transmitting through the GMSK channel with the preset frequency, wherein the fixed frequency is integer times of that of a clock signal. The communication method based on GMSK modulation can improve performance in transmitting the GMSK modulated signal.

Description

technical field [0001] The invention relates to the communication field, in particular to a communication method based on GMSK modulation and a method for detecting fixed frequencies. Background technique [0002] Digital modulation technology is an important part of the air interface of digital cellular mobile communication system. Under different cellular radii and application environments, mobile communications will exhibit different attenuation characteristics. Under given channel conditions, it has always been an important research topic to find an efficient modulation scheme with superior performance. [0003] Global System for Mobile Communication (Global System for Mobile Communication, hereinafter referred to as GSM system) is one of the main cellular systems. The single-channel baseband modulation processing chip developed for the GSM system transmitter completes the baseband modulation processing of the GSM system. [0004] The single-channel baseband modulatio...

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Application Information

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IPC IPC(8): H04L27/32H04L27/00
Inventor 陈青宇易大川景方阳乔磊
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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