Method and device for detecting modulation type of EDGE communication system

A technology of modulation type and communication system, which is applied in wireless communication, frequency modulation carrier system, phase modulation carrier system, etc., can solve the fundamental problem of the first burst pulse modulation type detection accuracy rate, low detection accuracy rate, error Judgment accumulation and other issues to achieve the effect of improving correctness, low complexity, and improving resistance

Inactive Publication Date: 2011-09-14
COMBA TELECOM SYST CHINA LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the above method needs to make a comprehensive judgment based on the previous results when detecting the modulation type of the current pulse, there will be accumulation of misjudgments
Moreover, the judgment of the following several pulse modulation types depends on the judgment of the first burst pulse modulation type, so the detection accuracy of the first burst pulse modulation type is not fundamentally solved.
[0007] In summary, in the prior art, the modulation type detection of the EDGE communication system is easily affected by multipath interference, the complexity is relatively high and the detection accuracy is low

Method used

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  • Method and device for detecting modulation type of EDGE communication system
  • Method and device for detecting modulation type of EDGE communication system
  • Method and device for detecting modulation type of EDGE communication system

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Embodiment 1

[0026] A kind of modulation type detection method of EDGE communication system, such as figure 1 shown, including the following steps:

[0027] Derotate the symbol of GMSK modulation on the received multiple sampling data, perform time delay synchronization on the derotated signal, determine the channel parameter estimate and time advance; extract the synchronous sampling sequence and burst pulse according to the time advance A biased sampling sequence, performing physical measurements on the synchronous sampling sequence and the biased sampling sequence to obtain the GMSK physical measurement value;

[0028] Perform 8PSK modulated symbol derotation on the received multiple sampling data, and perform time delay synchronization on the derotated signal to determine the channel parameter estimate and time advance; extract the burst synchronous sampling sequence and the time advance according to the time advance Biased sampling sequence, physical measurement is performed on the s...

Embodiment 2

[0035] It has been mentioned above that the physical measurement can be SNR measurement, noise power measurement or useful signal power measurement. The technical solution of the present invention will be further described below taking SNR measurement as an example.

[0036] Such as image 3 Shown, a kind of modulation type detection method of EDGE communication system, comprises the following steps:

[0037] In step S1, multi-sampling received data is obtained. Assuming that the modulation type is GMSK or 8PSK, symbol inverse rotation of GMSK or 8PSK modulation is performed (in this embodiment, 4 times the sampling data is taken as an example for illustration).

[0038] According to the GSM / EDGE protocol, the baseband modulation of 8PSK requires symbol rotation, that is, GMSK using linear modulation is equivalent to baseband modulation similar to 8PSK and needs to be symbol rotation. During demodulation, the operation of phase inverse rotation is required, and the followin...

Embodiment 3

[0081] Corresponding to a modulation type detection method of an EDGE communication system of the present invention, the present invention also provides a modulation type detection device of an EDGE communication system, such as figure 2 shown, including:

[0082] The GMSK modulation module is used to de-rotate the symbol of GMSK modulation on the received multiple sampling data, perform time-delay synchronization on the de-rotated signal, determine the channel parameter estimate and the time advance; and extract the burst according to the time advance Pulse synchronous sampling sequence and biased sampling sequence, physical measurement of the synchronous sampling sequence and biased sampling sequence, to obtain GMSK physical measurement value;

[0083] The 8PSK modulation module is used to de-rotate the symbols of the 8PSK modulation on the received multi-sampling data, perform time-delay synchronization on the de-rotated signal, determine the estimated value of the channel...

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Abstract

The invention provides a method and device for detecting the modulation type of a EDGE (Enhanced Data Rates for GSM Evolution) communication system, wherein the method comprises the following steps of: performing symbol counter-rotation of GMSK (Gaussian-filtered Minimum Shift Keying) modulation and 8PSK (8 Phase Shift Keying) modulation on received multiple sampling data respectively; performing time delay synchronization on counter-rotated signals to determine channel estimation values and time leads; extracting a synchronous sampling sequence and a biased sampling sequence of a burst pulse in accordance with various time leads; and performing physical measurement on the synchronous sampling sequence and the biased sampling sequence, comparing the physical measurement values obtained by calculation under two modulation types, and determining the modulation types by means of judgment. The method and the device provided by the invention greatly enhance the ability of judgment criteria in resisting channel distortion and noise owing to the consideration of asynchronous information quantity, effectively improve the correctness in detecting the modulation types, andare not high in complexity, simple, effective and great in application prospect.

Description

technical field [0001] The invention relates to the technical field of mobile communication, in particular to a method and device for detecting a modulation type of an EDGE communication system. Background technique [0002] The GSM communication system is the second generation mobile communication system, which has been widely used all over the world. However, with the development of mobile communication technology and the diversification of services, people's demand for data services continues to increase. The GSM system uses the Gaussian minimum shift keying (GMSK) modulation method, which is far from the wide-area coverage of the 384kbit / s data rate and the local area coverage of about 2Mbit / s data rate of the third-generation mobile communication system . At present, the European Telecommunications Standardization Institute (ETSI) has decided to develop an enhanced data rate GSM evolution solution - EDGE (Enhanced Data rates for GSM Evolution) as the future evolution ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W24/00H04L25/02H04L27/12H04L27/20
Inventor 付杰尉邓单
Owner COMBA TELECOM SYST CHINA LTD
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