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Method of processing CDMA signal components

A RAKE receiver and signal component technology, applied in the direction of electrical components, transmission systems, radio/inductive link selection and arrangement, etc., can solve the problems of increasing equipment requirements, large calculation amount, long matching filter of business channel, etc., to achieve Reduce calculations and achieve simplified effects

Inactive Publication Date: 2004-06-16
NOKIA TECH OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In one prior art solution, the matched filter of the traffic channel is relatively long, which increases the complexity of the receiver searcher due to the large computation required, thereby increasing the equipment requirements

Method used

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  • Method of processing CDMA signal components
  • Method of processing CDMA signal components
  • Method of processing CDMA signal components

Examples

Experimental program
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Embodiment Construction

[0045] The invention is preferably used in different mobile telephone systems implemented using spread spectrum techniques, although the invention is described here in the Universal Mobile Telephone System (UMTS) using Code Division Multiple Access, the invention is not limited to this system. However, the examples provided in describing the present invention are based on the description of the WCDMA system.

[0046] available through Figure 1 and figure 2 Describe the structure of UMTS. Figure 1 shows the brief structure of UMTS, so by figure 2 Which part of the known GSM system is depicted approximately corresponds to which part of UMTS to give an idea of ​​its specific structure. Obviously the comparison provided here is by no means constraining the UMTS system, but merely providing a guideline, since the responsibilities and functions of the different parts of UMTS are still being designed. The figure only includes functional blocks necessary to describe the present inv...

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Abstract

The invention relates to a method of processing multipath-propagated components of a signal in a communications system. In the method, a signal transmitted on the radio channel of the communications system is received (602) in a RAKE receiver and an impulse response of the radio channel is formed (604). In the method, one or more taps having the highest signal energy in the impulse response are located (606) and matched (608) to a short matched filter. A weighting value for the impulse response is calculated (610) on the basis of the one or more taps in the matched filter and a deviation between the weighting value and the centre point of the matched filter is compared (612) with a threshold value set for the deviation. The matched filter is moved (614 to 616) toward the deviation when the deviation exceeds the threshold value set for the deviation.

Description

technical field [0001] The invention relates to a radio system and a method of processing multipath propagated signal components. In particular, the present invention relates to a rake receiver in a radio system realized by spread spectrum technology. Background technique [0002] In a radio system, such as a mobile system, radio signals between a mobile phone and a base station travel along multiple routes between a transmitter and a receiver. The signal can travel directly from the mobile phone to the base station if there are no obstacles between them. In urban environments, buildings, cars, and other obstacles cause reflections and scattering of radio signals. The multipath propagated components of the signal thus travel distances of different lengths on the radio path, causing these components to arrive at the receiver at different times. Some radio systems, such as those implemented using spread spectrum techniques and employing Code Division Multiple Access (CDMA),...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/707H04W56/00
CPCH04B1/712H04B1/7115H04B1/7117
Inventor 加科·维利拉
Owner NOKIA TECH OY