Method and device for equilibrium demodulation

A technology for balanced demodulation and channel response, which is applied to the shaping network in the transmitter/receiver, baseband system components, multi-frequency code system, etc. Poor and other problems, to achieve the effect of shortening the channel dispersion length, reducing the number of states, and reducing the computational complexity of the system

Active Publication Date: 2012-11-07
COMBA TELECOM SYST CHINA LTD
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  • Description
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Problems solved by technology

[0008] Embodiments of the present invention provide a balanced demodulation method and device, which are used to solve the problems in the prior art that the channel dispersion length is relatively large, resulting in high system computational complexity and poor demodulation performance when performing balanced demodulation

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  • Method and device for equilibrium demodulation
  • Method and device for equilibrium demodulation
  • Method and device for equilibrium demodulation

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Embodiment 1

[0027] Such as figure 1 As shown, it is a schematic flow chart of the balanced demodulation method described in Embodiment 1 of the present invention. The balanced demodulation method can be applied to EDGE and its evolution communication system. The method specifically includes the following steps:

[0028] Step 101: Invert the received signal, and perform delay synchronization on the inverted signal to obtain a synchronization signal.

[0029] Specifically, the received signal is flipped at the receiving end, and a locally known training sequence is used to perform a correlation operation with the flipped signal to obtain an estimated value of the channel parameter.

[0030] For a regular burst, the training sequence is 26 symbols, placed in the middle of each burst, and the 26 symbols are known, so the received signal can be used to perform a correlation operation with the known training sequence, as can The method of sliding correlation is adopted, and the orthogonality o...

Embodiment 2

[0095] Such as Figure 4 As shown, it is a schematic structural diagram of the equalized demodulation device described in Embodiment 2 of the present invention, and the equalized demodulation device includes a channel estimation module 11, a pre-filtering module 12, a channel response processing module 13 and an equalized demodulation module 14, further Ground, described balanced demodulation device also comprises synchronous signal processing module 15:

[0096] The synchronous signal processing module 15 is used to invert the received signal, and perform time delay synchronization on the inverted signal to obtain a synchronous signal.

[0097] Specifically, the synchronization signal processing module 15 is used to invert the received signal, and use a locally known training sequence to perform a correlation operation with the inverted signal to obtain an estimated value of the channel parameter, and obtain the channel parameter After estimating the value, the time advance is...

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Abstract

The invention discloses a method and a device for equilibrium demodulation. The method comprises the following steps of: calculating a pre-filter coefficient according to a channel estimated value which is acquired by performing channel estimation on a synchronizing signal, and pre-filtering the synchronizing signal by using the pre-filter coefficient to acquire the pre-filtered synchronizing signal; acquiring minimum phase channel response, performing effective diameter judgment on the minimum phase channel response, selecting taps which accord with the set condition, and setting the number of the selected taps as effective channel dispersion length; and performing the equilibrium demodulation on the pre-filtered synchronizing signal by using the selected taps and the effective channel dispersion length. By the method and the device, minimum phase channels which are added to a pre-filter have the characteristic of minimum delay, and the energy of the minimum phase channels is concentrated, so that the number of the acquired taps is small after the minimum phase channels are subjected to effective diameter judgment, the channel dispersion length is effectively reduced, the number of states during equilibrium demodulation is reduced, and effects of reducing the calculation complexity of a system and improving the performance of equilibrium demodulation are achieved.

Description

technical field [0001] The present invention relates to the technical field of mobile communication, in particular to an equalized demodulation method and device. Background technique [0002] The Global System for Mobile Communications (GSM) is the second generation mobile communication system, which has been widely used all over the world, but because it uses Gaussian minimum shift keying (GSM , GMSK) modulation method is still far from the wide-area coverage of 384kbit / s data rate and the local area coverage of about 2Mbit / s data rate of the third-generation mobile communication system. Therefore, in order to further increase the data transmission rate, To expand the capacity of the GSM system, the European Telecommunications Standardization Institute (ETSI) has decided to enhance the data rate GSM evolution program (Enhanced Data rates for GSM Evolution, EDGE) as the future evolution direction of GSM. [0003] EDGE is a transition technology from GSM to the third-genera...

Claims

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Application Information

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IPC IPC(8): H04L25/03H04L25/02H04L27/26
Inventor 付杰尉邓单
Owner COMBA TELECOM SYST CHINA LTD
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