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Interference elimination in receiver of radio system

A radio system, interference elimination technology, applied in transmission systems, electrical components, etc., can solve problems such as poor performance, detected signals, strong noise, etc., and achieve good performance results

Inactive Publication Date: 2003-11-05
NOKIA TECH OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But in many operating situations where the external interference is weak and the interfering-to-signal ratio is on the order of 1dB, the performance of the external interference cancellation algorithm used to remove the external interference is severely poor
Also, in many operating situations the noise is so intense that it is difficult to detect the signal from the noise

Method used

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  • Interference elimination in receiver of radio system
  • Interference elimination in receiver of radio system
  • Interference elimination in receiver of radio system

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Embodiment Construction

[0018] The present invention will be described below with reference to the accompanying drawings. Figure 2 shows a preferred embodiment of the method. The spread spectrum signal is received 202 at a receiver. First, multi-user interference is canceled from the received spread spectrum signal in one or more interference cancellation stages. The method for canceling multi-user interference may be, for example, parallel interference cancellation PIC, serial interference cancellation SIC or a combination of both, or corresponding known methods. In terms of performance and complexity, a single-stage PIC may sometimes be the type of receiver available. But in reality, there may be two or three stages, because at least up to three stages, the signal estimate that will be generated from the user signal is improved. A phase of parallel interference cancellation typically includes the following phases: despreading user signals, generating user signal estimates, regenerating user sign...

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Abstract

The invention relates to a receiver in a spread spectrum system comprising receiving means (500) for receiving spread spectrum signals. The receiver comprises interference cancellation means (502) configured to cancel multi-user interference and external interference from the received spread spectrum signal in one or more interference cancellation stages. The invention also relates to a method for eliminating interference in a spread spectrum system.

Description

technical field [0001] The invention relates to interference cancellation in a receiver of a radio system. Background technique [0002] As the number of mobile communication systems and users increases day by day, mobile communication systems must be located near each other's frequency bands more and more often, that is, the guard frequency bands between systems must be reduced. The inevitable result is that radio systems will increasingly cause mutual interference, which should be taken into account when designing the system. This situation can be illustrated by Figure 1, where two radio systems operate within the same geographical area. The base transceiver station 100 belongs to a first radio system and serves a terminal device 104 . In contrast, the base transceiver station 102 belongs to the second radio system and serves the terminal 106 . A terminal device 106 located within the coverage area 110 of a base transceiver station 100 is located far away from the base ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/707
CPCH04B1/71075H04B1/7115
Inventor 尤卡·努蒂宁卡里·帕尤科斯基卡里·霍内曼
Owner NOKIA TECH OY