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Incremental iterative time-varying channel evaluation and inter carrier interference (ICI) elimination method of fast orthogonal frequency division multiplexing (OFDM) system

A time-varying channel and channel estimation technology, applied in the field of OFDM iterative channel estimation with ICI elimination, can solve the problems affecting the accuracy and inaccuracy of frequency domain estimation

Inactive Publication Date: 2013-05-15
BEIJING UNIV OF TECH
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Problems solved by technology

However, since ICI will affect the accuracy of frequency domain estimation, in a fast-moving environment, a large number of iterations are required, and the results of channel estimation are also inaccurate at low signal-to-noise ratio (SNR)

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  • Incremental iterative time-varying channel evaluation and inter carrier interference (ICI) elimination method of fast orthogonal frequency division multiplexing (OFDM) system
  • Incremental iterative time-varying channel evaluation and inter carrier interference (ICI) elimination method of fast orthogonal frequency division multiplexing (OFDM) system
  • Incremental iterative time-varying channel evaluation and inter carrier interference (ICI) elimination method of fast orthogonal frequency division multiplexing (OFDM) system

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[0116] The progressive iterative time-varying channel estimation and ICI elimination method of the fast-changing OFDM system is characterized in that, in the channel estimation of the OFDM system, the sum SIN of ICI and noise is used as the denoising object of the Kalman filter, from only using the pilot point information, gradually increase the information used for iterative calculation, and implement it according to the following steps:

[0117] Step (1), the transmitting end generates the sending data, and inserts the pilot data into the sending data according to the comb pilot method:

[0118] The sending end is set as follows: s represents the sth OFDM symbol, s=1,2,...,s,...S, each OFDM symbol contains N subcarriers, n=1,2,...,n,...,N, which contains N p pilot symbols and N d data symbols, N d +N p = N, n p =1,2,...,N p , the position matrix of the pilot in the frequency domain is expressed as: in And guarantee N p ≥L, L is the maximum value of channel mult...

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Abstract

An incremental iterative time-varying channel evaluation and inter carrier interference (ICI) elimination method of fast orthogonal frequency division multiplexing (OFDM) system is applied in the field of wireless communication channel evolution, and is used for channel evaluation based on pilot frequency in the circumstance that a severe ICI influence of a time-varying channel occurs. The incremental iterative time-varying channel evaluation and ICI elimination method of fast OFDM system is characterized in that the sum of an ICI and a channel noise (SIN) is taken as a denosing object of a Kalman wave filter, and the ICI influence when the Kalman wave filter evaluates is eliminated. In addition, an incremental mode is used by data used for iteration, the number of the sub-carrier waves used for measurement increases slowly along two sides of each pilot frequency point in an iterative process, and thus the influence caused by the ICI is suppressed. The performance of the incremental iterative time-varying channel evaluation and ICI elimination method of fast OFDM system is improved significantly compared with an existing algorithm in the circumstance that signal noise ratio (SNR) is small.

Description

technical field [0001] The invention relates to a progressive OFDM iterative channel estimation method with ICI elimination. It belongs to the related field of channel estimation research in wireless communication. technical background [0002] Orthogonal Frequency Division Multiplexing (OFDM) is a kind of multi-carrier modulation. Its idea is to divide the channel into several mutually orthogonal sub-carriers, and convert high-speed serial data into parallel groups of low-speed Data streams are transferred to these sub-carriers for transmission to improve spectrum utilization. If the signal bandwidth on the sub-carrier is smaller than the relevant bandwidth of the channel, the sub-carrier can be regarded as flat fading, thereby eliminating inter-symbol interference. Due to its high spectrum utilization rate and good anti-interference ability, OFDM technology has been widely used in broadcast audio, video and civil communication systems. The main applications include: asym...

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Application Information

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IPC IPC(8): H04L27/26H04L25/02H04L25/03
Inventor 杨睿哲张琳张杰张延华孙艳华孙恩昌司鹏搏
Owner BEIJING UNIV OF TECH
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