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Method for eliminating inter-subcarrier interference based on OFDM system

An inter-sub-carrier interference and sub-carrier technology, applied in the field of non-ideal factor elimination and communication, can solve problems such as orthogonality deterioration, deterioration of system performance, interference, etc., to reduce system performance loss, eliminate inter-sub-carrier interference, hardware Achieving low-complexity effects

Active Publication Date: 2013-01-02
宁夏储芯科技有限公司
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Problems solved by technology

[0003] Due to the influence of multipath delay (Zheng Li, Xia Lei, Wanbin Tang, Yue Xiao, Shaoqian Li, Channel estimation for OFDM in time-variant multi-path environment, 2008IEEE.) and the time caused by Doppler frequency shift The impact of variable fading channels (Ali Ramadan Ali, Tariq Jamil Khanzada, Abbas Omar, Channel estimation for OFDM systems in rapidly time-variant channels using high degree channel approximation.IEEE international conference on Wireless&Mobile computing, Nerworking&Communication), the orthogonality of system subcarriers performance will deteriorate, causing inter-carrier interference (ICI), thereby deteriorating system performance

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  • Method for eliminating inter-subcarrier interference based on OFDM system
  • Method for eliminating inter-subcarrier interference based on OFDM system
  • Method for eliminating inter-subcarrier interference based on OFDM system

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Embodiment Construction

[0054] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0055] The method for eliminating the interference between subcarriers based on the OFDM system proposed by the present invention is based on the method and simulation of the elimination of interference between subcarriers of the China Mobile Multimedia Broadcasting (CMMB) system, and is carried out by combining the method in the time domain and the frequency domain Suppress and eliminate inter-subcarrier interference to effectively reduce the deterioration of system performance caused by time-varying fading channels and multipath maximum delay.

[0056] The flow chart of the method for eliminating the interference between subcarriers based on the OFDM system provided by the present invention, the method includes: calculat...

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Abstract

The invention discloses a method for eliminating inter-subcarrier interference based on an OFDM system. The method comprises the following steps of: calculating phase angle deviation theta (i, j) of each subcarrier in a current OFDM frame symbol in time domain and performing phase angle compensation of the time domain; and performing equalization operation on the frequency domain of the OFDM system. By using the method, the inter-subcarrier interference caused by multi-path time delay or a time-varying channel can be effectively eliminated so as to effectively reduce the loss of system performance caused by ICI.

Description

technical field [0001] The invention relates to the technical field of eliminating non-ideal factors in the communication field, in particular to a method for eliminating interference between subcarriers based on an Orthogonal Frequency Division Multiplexing (OFDM) system. Background technique [0002] The OFDM system is a high-speed transmission technology in a wireless environment. The frequency response curve of wireless channels is mostly non-flat, and the main idea of ​​OFDM technology is to divide a given channel into many orthogonal sub-channels in the frequency domain, use a sub-carrier for modulation on each sub-channel, and each sub-carrier is parallel Transmission, so the main feature of the OFDM system is that the carriers of each sub-channel are orthogonal to each other. [0003] Due to the influence of multipath delay (Zheng Li, Xia Lei, Wanbin Tang, Yue Xiao, Shaoqian Li, Channel estimation for OFDM in time-variant multi-path environment, 2008IEEE.) and the t...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/03H04L27/26
Inventor 毛剑慧黑勇周玉梅
Owner 宁夏储芯科技有限公司
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