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Signal interference detection method and device

A signal interference and detection method technology, applied in the field of mobile communication, can solve the problems of ineffective detection of system interference signals, low accuracy and reliability, etc., and achieve the effect of reducing errors and eliminating interference

Inactive Publication Date: 2011-11-09
ZTE CORP
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Problems solved by technology

[0007] The embodiment of the present invention provides a signal interference detection method and device to solve the problems in the prior art that the accuracy and reliability of signal interference detection are low and the interference signals in the system cannot be effectively detected

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  • Signal interference detection method and device
  • Signal interference detection method and device

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Embodiment Construction

[0028] When data transmission is performed in the OFDM system, the total power of each subcarrier transmitted is composed of signal power and noise plus interference power, based on the above-mentioned characteristics of signal transmission in the OFDM system, the signal interference detection method provided by the embodiment of the present invention is effective for The noise interference power of the subcarriers in the received frequency domain signal is estimated, and according to the frequency points (ie physical locations) where each subcarrier is located, the estimated noise interference power of multiple subcarriers in the received frequency domain signal is calculated Statistically, obtain the average value of noise interference estimation values ​​of multiple subcarriers at each frequency point, and determine whether there is interference at each frequency point according to the obtained average value. The flow process of the inventive method is as figure 2 As shown...

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Abstract

The invention discloses a signal interference detection method and a signal interference detection device. The method comprises the following steps of: traversing a data constellation diagram of frequency domain signals according to the received channel response of sub-carriers in the frequency domain signals in a frequency domain, and determining transmitted signal estimated values corresponding to the sub-carriers; determining interference and noise power estimated values of the sub-carriers according to the transmitted signal estimated values and the channel response; for frequency points of each sub-carrier in the received frequency domain signals, counting the interference and noise power estimated values of the sub-carriers at each frequency point, and computing a mean value of the interference and noise power estimated values of each sub-carrier at each frequency point; and comparing the computed mean value with a preset interference and noise power threshold value to determine whether interference exists at each frequency point or not. By the method and the device, interference signals in a system can be effectively detected with high accuracy and reliability.

Description

technical field [0001] The invention relates to the technical field of mobile communication, in particular to an interference signal detection method based on noise interference power (Interference and Noise power, NI) estimation. Background technique [0002] Since a new generation of wireless communication systems requires a higher transmission rate for data transmission, an Orthogonal Frequency Division Multiplexing (OFDM) technology emerges as the times require. This technology divides serial data into N different parallel data streams, and transmits data in parallel on N subcarriers. There is no interference between multiple parallel subcarriers, which greatly improves the data transmission rate of the system. Moreover, each of its The data stream of subcarriers has a lower bit rate, thereby improving the reliability of data transmission. [0003] In the OFDM system, the coded and modulated data is used as frequency domain information at the sending end, and the freque...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L27/26
CPCH04J11/0023H04L25/03821H04B17/0055H04B17/345
Inventor 周旭武陈威王守义
Owner ZTE CORP
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