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Apparatus and method for identifying mobile signal in mobile communication system

A mobile signal and signal technology, applied in the field of identifying mobile signals, can solve the problems of inefficiency of the Doppler estimator, waste of wireless resources of the base station, delay of initial synchronization time, etc.

Inactive Publication Date: 2004-07-07
LG ELECTRONICS INC
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Problems solved by technology

Therefore, it does not make sense to give weights to non-coherent accumulation
[0025] In addition, the initial synchronization time is delayed longer and wastes radio resources of the base station
That is, a Doppler estimator that only considers the UE's moving velocity when given weights for coherent and incoherent accumulation is inefficient

Method used

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  • Apparatus and method for identifying mobile signal in mobile communication system
  • Apparatus and method for identifying mobile signal in mobile communication system
  • Apparatus and method for identifying mobile signal in mobile communication system

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Embodiment Construction

[0040] Typically, a Doppler estimator is used in the multipath searcher of the base station modem to search and identify the mobile UE's signal. However, the Doppler estimator only considers the moving speed of the UE. Even if the mobile speed of the UE is high, it is meaningless to give a weight to the non-coherent accumulator if the SNR is low. Therefore, the average acquisition time taken to identify a received signal is longer in non-coherent multi-slot accumulation than in coherent multi-slot accumulation. Also, the initial synchronization time is also increased, and thus the radio resources of the base station are wasted.

[0041] According to the invention, by adding a Signal-to-Interference Ratio (SIR) estimator, the Doppler estimator controls the weights to be provided to the non-coherent accumulator according to the signal-to-noise ratio. The device and method for identifying mobile signals in a mobile communication system according to the present invention will be...

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Abstract

A method and apparatus for recognizing signals in a mobile communication system reduces a mean acquisition time based on a signal-to-noise ratio of a received signal and the moving speed of user equipment which transmitted the signal. This apparatus includes a multi-path searcher of a base station modem which analyzes a signal from the moving user equipment using a Doppler estimator, decides the moving speed of the user equipment, and transmits a control signal proportional to the moving speed to coherent and non-coherent accumulators. A signal-to-interference ratio estimator then decides a signal-to-noise ratio of the signal and compensates for a control signal transmitted to each accumulator. Through this approach, higher reliability is achieved than other multi-path searchers, which merely consider the moving speed of the user equipment. Also, a mean acquisition time taken to recognize and search signals and an initial synchronization time are reduced and wireless resources of a base station are saved.

Description

technical field [0001] The present invention relates generally to mobile communication systems, and more particularly to an apparatus and method for identifying mobile signals in a receiving base station. Background technique [0002] The first mobile communication system was offered in St.Louis, USA in 1946, which used a 150MHz bandwidth. This type of system has developed into a variety of complex structures that allow users to talk to anyone, anytime, anywhere by telephone. Noticing such advantages of the system, the number of users of mobile communication systems has grown enormously, especially in recent years. [0003] Demand for fast, high-quality and mobile communication services is growing. However, conventional frequency division multiple access (FDMA) or time division multiple access (TDMA) is not satisfactory due to limited bandwidth. In order to solve the above problems, CDMA has been proposed. CDMA offers many technical advantages, such as large paging capac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/69H04W88/08
CPCH04W88/08H04B1/711
Inventor 黄凤俊
Owner LG ELECTRONICS INC
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