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Communication method based on gmsk modulation and detection method of fixed frequency

A technology of fixed frequency and communication method, applied in modulation carrier system, digital transmission system, multi-carrier system, etc., can solve the problems of affecting base station reception, poor communication quality, poor GMSK radio frequency channel transmission performance, etc., to avoid transmission interference , The effect of improving signal transmission performance and optimizing communication quality

Active Publication Date: 2018-06-05
SPREADTRUM COMM (SHANGHAI) CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 detection method of fixed frequency
  • Communication method based on gmsk modulation and detection method of fixed frequency
  • Communication method based on gmsk modulation and detection method of 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] In the following description, many specific details are set forth in order to fully understand 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 it cann...

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Abstract

The invention relates to a communication method based on GMSK modulation and a fixed frequency detection method. The communication method based on GMSK modulation includes: performing GMSK modulation on an input signal to obtain a first modulated signal; sending the first modulated signal using a channel of a specified frequency, wherein, if the specified frequency is a fixed frequency, then using a channel of a specified frequency 8PSK channel for transmission, if the specified frequency is a frequency other than the fixed frequency, use the GMSK channel of the specified frequency for transmission; the fixed frequency is an integer multiple of the clock signal. The invention can improve the performance of transmitting GMSK modulation 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] The Global System for Mobile Communication (GSM system for short) 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 modulation processing chip is a digital-analog chip. According...

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Application Information

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