Combined narrowband interference detection, elimination and channel estimation method based on continuous cyclic shift training sequence in OFDM system

A technology of training sequence and narrowband interference, which is applied in the fields of elimination and channel estimation, estimation, and joint narrowband interference detection, which can solve problems such as low precision, lack of robustness, and inability to accurately reconstruct narrowband interference

Active Publication Date: 2016-08-24
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

Existing frequency-domain methods detect and eliminate narrow-band interference by setting thresholds, or use compressed sensing algorithms to estimate and eliminate interference. These methods are not robust to asynchronous narrow-band interference with frequency offset; time-domain methods first pass The time-domain linear filter locates

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  • Combined narrowband interference detection, elimination and channel estimation method based on continuous cyclic shift training sequence in OFDM system
  • Combined narrowband interference detection, elimination and channel estimation method based on continuous cyclic shift training sequence in OFDM system
  • Combined narrowband interference detection, elimination and channel estimation method based on continuous cyclic shift training sequence in OFDM system

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[0067] The present invention will be further described below in conjunction with accompanying drawing.

[0068] figure 1 It is a flow chart of the joint narrowband interference detection, elimination and channel estimation method provided by the present invention. Such as figure 1 As shown, the method includes the following steps:

[0069] Step 1), design a two-symbol training sequence with continuous cyclic shift characteristics

[0070] Step 2), using the designed robust statistics with threshold Perform a comparison test to determine whether there is narrow-band interference.

[0071] 2.1. Calculate the decision statistics of narrowband interference detection

[0072] 2.2. Calculate the judgment threshold according to formula (4) ,like , it is judged that there is narrow-band interference; if , it is judged that there is no narrowband interference.

[0073] Step 3), if narrowband interference is detected, start from the data part of the first OFDM symbol, u...

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Abstract

The present invention relates to a combined narrowband interference detection, elimination and channel estimation method based on a continuous cyclic shift training sequence in an OFDM system. On the condition of using two OFDM symbol training sequences to carry out the channel estimation, the method utilizes a signal detection and estimation technology and a training sequence design technology to realize the asynchronous narrowband interference detection, estimation and elimination, is applied to a the OFDM systems existing the narrowband interference, such as a wireless local area network IEEE802.11a, a wireless metropolitan area network WiMAX IEEE 802.16e, etc., realizes the accurate estimation and elimination of an asynchronous narrowband signal while realizing the interference robustness detection, and enables the training sequence auxiliary channel estimation performance on an interference condition to be improved effectively.

Description

technical field [0001] The present invention relates to an anti-narrowband interference channel estimation method in an OFDM system, specifically, to a method for realizing joint narrowband interference detection, estimation, elimination and channel estimation using two OFDM training symbols with continuous cyclic shift characteristics . Background technique [0002] With the explosive growth of wireless services, spectrum is a precious resource. Allowing multiple communication services to share spectrum is one of the feasible solutions to solve spectrum congestion. At present, in unlicensed frequency bands such as ISM (Industrial-Scientific-Medical), the coexistence of multiple communication systems has become a reality. When narrowband systems and OFDM-based broadband communication systems coexist, narrowband interference becomes an important issue to be considered in receiver design. Although cognitive radio technology can avoid interference through spectrum sensing, th...

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Application Information

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IPC IPC(8): H04L27/26
CPCH04L27/2691H04L27/2695
Inventor 张晓瀛魏急波马东堂吴宇王欣王桁瑶黄卫英
Owner NAT UNIV OF DEFENSE TECH
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