The Method of Resisting Narrowband Interference in Ofdm Communication System

A narrowband interference and communication system technology, applied in the field of wireless communication, can solve problems such as jitter, pause, decoding error, etc., and achieve the effect of reducing FER, improving performance, and resisting narrowband interference

Active Publication Date: 2016-03-02
SHANGHAI RES CENT FOR WIRELESS TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Under strong narrowband interference signal interference, although OFDM technology and frequency diversity technology can resist narrowband interference, decoding errors may occur in both the discrete subcarrier allocation method and the continuous subcarrier allocation method, resulting in mosaic, pause, and jitter in video transmission etc., which greatly affect the normal use of the business and cannot meet the needs of users for high-quality video services

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  • The Method of Resisting Narrowband Interference in Ofdm Communication System
  • The Method of Resisting Narrowband Interference in Ofdm Communication System
  • The Method of Resisting Narrowband Interference in Ofdm Communication System

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Embodiment 1

[0059] In this embodiment, the communication system of the IEEE802.16-2005 standard is used to describe the inventive method.

[0060] According to information such as the current frame error rate and bit error rate of the system, the base station chooses whether to perform interference detection. New available frequency domain resource information can be obtained through interference detection to ensure effective data transmission; the base station transmits the bitmap mask to the terminal through the FCH in the downlink subframe, thereby establishing a new data connection. see figure 1 , the method for resisting narrowband interference of the present invention specifically comprises the following steps:

[0061] [Step S1] According to the current frame error rate and bit error rate information of the system, the base station side initiates interference detection. The MAC layer of the base station allocates the interference detection time and determines the interference dete...

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Abstract

The invention discloses a method resisting narrow-band interference in an orthogonal frequency division multiplexing (OFDM) communication system. According to the method, an OFDM physical layer obtains interference situations inside a channel used by a current system by means of interference detection, a media access control (MAC) layer calculates available bitmap masks corresponding to spectrum resources according to the interference situations reported by the physical layer and transmits the masks to the physical layer again, the physical layer uses an interference avoiding method and carries out sub-carrier mapping again according to the bitmap masks, the physical layer achieves bitmap information interaction between a base station and a terminal according to a frame structure used for dynamic interaction of the bitmap masks, and the terminal carries out downlink receiving and uplink transmitting according to new bitmap masks, and carries out normal communication flow. The method can effectively resist the narrow-band interference, lowers a system floating error rate (FER) under interference environment, performance of discrete type sub-carrier distribution way is improved, and normal communication of the system under multiple burst interference situations can be achieved.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and relates to an anti-jamming method of an OFDM communication system, in particular to a method for resisting narrow-band interference in an OFDM communication system. Background technique [0002] OFDM (Orthogonal Frequency Division Multiplexing) is Orthogonal Frequency Division Multiplexing technology. A type of OFDM multi-carrier modulation. The main idea is: divide the channel into several orthogonal sub-channels, convert high-speed data signals into parallel low-speed sub-data streams, and modulate them on each sub-channel for transmission. Orthogonal signals can be separated by using correlation techniques at the receiving end, which can reduce the mutual interference ICI between sub-channels. The signal bandwidth on each sub-channel is smaller than the correlation bandwidth of the channel, so each sub-channel can be regarded as flat fading, so that inter-symbol interferen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26
Inventor 刘广宇高子旺贠超陈拥兵陆犇卜智勇解云雁
Owner SHANGHAI RES CENT FOR WIRELESS TECH
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