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Equilized demodulation method used in mobile communication system

A mobile communication system and balanced demodulation technology, applied in the field of mobile communication systems, can solve the problems of increased complexity, large amount of calculation, and many resources, and achieve the effects of improving receiving performance, fast execution speed, and small computational complexity

Inactive Publication Date: 2003-09-17
ZTE CORP
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Problems solved by technology

However, due to the use of blind equalization technology, the complexity of its calculation is greatly increased
[0010] Since the Viterbi algorithm needs to be used for iterative processing when performing balanced demodulation of the data sent by the wireless channel, the amount of calculation is large, the time is long, and the resources consumed are relatively large. Therefore, it is necessary to compromise between computational complexity and hardware resources. , using a balanced demodulation method suitable for mobile terminals, especially GSM / GPRS mobile terminals

Method used

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  • Equilized demodulation method used in mobile communication system
  • Equilized demodulation method used in mobile communication system
  • Equilized demodulation method used in mobile communication system

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Embodiment Construction

[0027] The method of the present invention comprehensively considers the performance, complexity, stability and convergence speed of the balanced demodulation method, adopts the improved Viterbi algorithm to carry out balanced demodulation to the input baseband digital I, Q signal, and solves the problem of signal in mobile communication. Various distortions in the wireless channel, such as the zero point of the channel characteristics, especially the intersymbol interference caused by the multipath effect.

[0028] figure 1 It is a schematic diagram of the channel model of the mobile communication system. The mobile terminal receives the data sent through the wireless channel. The demodulation module demodulates the received baseband I and Q signals first, and then sends the demodulated results to the channel The decoding module performs channel decoding. For the control channel, the information sent by the system can be directly obtained so far; for the business channel, th...

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Abstract

An equilibrium demodulation method used in the mobile communication system includes: carrying on amplitude limitation process for them after sampling data of I (phase inversion) and Q (quadrature) ofbaseband are received by the mobile terminal and further carrying on rotation removel treatment and converting the received multiple data to real number, utilizing the training series kept the storage to carry on related calculation for estimating impact response of channel, conforming the position for the training serial in input series, calculating the mensuration initial value, and then carrying on iteration calculation for obtaining state transfer diagram and utilizing the state transfer diagram to obtain decoding output series.

Description

technical field [0001] The invention relates to a mobile communication system, in particular to an equalized demodulation method for a mobile receiver in the GSM / GPRS mobile communication system. Background technique [0002] After receiving the signal transmitted by the wireless channel, the receiver of the mobile communication system needs to estimate the most likely modulated data sequence from the received signal, that is, perform demodulation. In the GSM / GPRS system, to accomplish this task, part of each burst is modulated by a sequence (training sequence) known in advance by the receiver, which allows the receiver to estimate Signal distortion caused by path effects. [0003] In the GSM / GPRS specification, there is no restriction on which method to use for demodulation, and the method used only needs to be able to identify two multipath signals with the same power received within an interval of 16us (ie about 4 bit width). In this case, compared with the interference...

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Application Information

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IPC IPC(8): H04B7/005H04B7/26
Inventor 谭扬波黄勇何剑王磊
Owner ZTE CORP
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