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Novel OFDM signal channel estimation combination ICI self elimination method

A new type of channel estimation technology, applied to transmitter/receiver shaping network, baseband system components, multi-frequency code system, etc., can solve the problems of high complexity and low spectrum utilization, and achieve performance improvement, Effect of Improving Spectrum Utilization Efficiency

Inactive Publication Date: 2010-07-14
BEIJING JIAOTONG UNIV
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AI Technical Summary

Problems solved by technology

Due to the high complexity of solving the equation, the spectrum utilization rate of the classic ICI self-cancellation method is too low

Method used

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  • Novel OFDM signal channel estimation combination ICI self elimination method
  • Novel OFDM signal channel estimation combination ICI self elimination method
  • Novel OFDM signal channel estimation combination ICI self elimination method

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Embodiment Construction

[0031] The present invention will be described in more detail below in conjunction with the accompanying drawings and specific embodiments.

[0032] Firstly, an OFDM system model is given here.

[0033] Assuming an OFDM system model with N subcarriers, the source binary information is interleaved, coded, and mapped as x=[X[0], X[1],...,X[N-1]], and then after N The point IFFT modulation transformation obtains the time domain x=[x(0), x(1),...,x(N-1)], where x(n) is expressed as:

[0034] x ( n ) = 1 N Σ m = 0 N - 1 X [ m ] exp ( j 2 π mn N ) , 0 ≤ n ≤ N - ...

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Abstract

The invention discloses a novel OFDM signal channel estimation combination ICI self elimination method. The sending end pilot frequency design adopts a cluster type pilot frequency OFDM structure with the ICI estimation function. The receiving end is processed according to the following steps: a, converting proceeding FFT of an OFDM sign to a frequency domain, taking out the pilot frequency, and carrying out ICI elimination signal channel estimation; b, carrying out counter modulation after using the signal channel estimation in the first step for coarse balancing; c, using the signal channelestimation in the first step for time domain linear continuous sign signal channel estimation; d, calculating ICI signal channel matrixes through cyclic convolution by using a time domain pulse response structure in the third step, and obtaining ICI interference matrixes; and e, carrying out ICI elimination through combining counter modulation signals in the second step and ICI interference matrixes in the fourth step, and making the judgment after the secondary balancing. The invention solves the problem of influence on OFDM by interference between carrier waves under the condition of lineartime change signal channels, and improves the frequency spectrum utilization rate and the system performance.

Description

technical field [0001] The invention relates to the technical field of wireless mobile communication, in particular to a novel OFDM channel estimation joint inter-carrier interference (Inter-Carrier Interference-ICI) elimination method. Background technique [0002] With the rapid development of wireless communication, people pay more and more attention to how to provide high-speed data services for high-speed mobile terminals, and high-speed railway broadband wireless access is one of the application scenarios. [0003] Orthogonal Frequency Division Multiplexing (OFDM), as a high-speed wireless communication technology, can effectively combat the Inter-Symbol Interference (ISI) caused by frequency selective fading, and has become one of the candidates for the next generation of wireless communication. However, OFDM is very sensitive to inter-carrier interference (ICI) caused by frequency offset. The ICI of OFDM system is mainly caused by carrier frequency offset (CFO), phas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L25/02H04L25/03
Inventor 刘留陶成邱佳慧
Owner BEIJING JIAOTONG UNIV
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