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An estimation method for OFDM channel based on time-frequency conversion

A technology of channel estimation and time-frequency transformation, applied in the field of channel estimation based on time-frequency transformation, to achieve the effect of eliminating the problem of error flat bottom and reducing complexity

Inactive Publication Date: 2009-08-05
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0009] The technical problem to be solved by the present invention is to adopt a new channel estimation method based on time-frequency transformation to eliminate the error flat bottom problem, improve estimation accuracy, and reduce calculation complexity

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  • An estimation method for OFDM channel based on time-frequency conversion
  • An estimation method for OFDM channel based on time-frequency conversion
  • An estimation method for OFDM channel based on time-frequency conversion

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Embodiment Construction

[0016] Now in conjunction with the accompanying drawings and specific implementation methods, the technical solution for implementing the channel estimation algorithm proposed by the present invention is specifically described as follows:

[0017] figure 1 The basic principle of OFDM channel estimation method based on time-frequency transform is shown. The schematic diagram shows the signal sequence received by the receiver in the frequency domain, after a series of time / frequency domain transformation processing, an accurate estimation value of the frequency domain response of the channel is finally obtained.

[0018] 1. The receiver uses the training sequence to calculate the least squares LS estimate of the frequency domain response of the channel. In the OFDM system, the algorithm module is called to establish a diagonal matrix with the training sequence received by the receiver as the diagonal element, and the inverse matrix of the diagonal matrix is ​​obtained. The prod...

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Abstract

The invention belongs to the technical field of communication, and in particular discloses a channel estimation method based on time-frequency transformation in an Orthogonal Frequency Division Multiplexing (OFDM) system. The method uses a diagonal matrix composed of diagonal elements of the channel time-domain correlation matrix to form a new linear transformation matrix, thereby obtaining a new channel estimation method based on time-frequency transformation. Using this method not only avoids the inreducible error floor problem existing in most time-frequency transform-based channel estimation methods in OFDM systems, but also obtains a good estimation effect very close to the minimum linear mean square error (LMMSE), and fast discrete Fourier The introduction of transform (FFT) and inverse fast Fourier transform (IFFT) makes the complexity of this algorithm small and easy to operate, so this method has a good prospect of practical application.

Description

technical field [0001] The invention relates to modulation and demodulation technology in an Orthogonal Frequency Division (OFDM) system, in particular to a channel estimation method based on time-frequency transformation. Background technique [0002] At present, with the rapid growth of the demand for communication services, higher requirements are put forward for the transmission rate of wireless communication systems and wireless local area networks, and the increase of transmission rate brings inter-symbol interference (ISI) and frequency selection to conventional single-carrier systems. The problem of sexual fading, using Orthogonal Frequency Division Multiplexing (OFDM) is one of the effective ways to solve these problems. OFDM is a multi-carrier transmission method, which disperses high-speed data to several low-rate sub-carriers for parallel transmission. [0003] For OFDM systems, under the same bit error rate requirements, the signal-to-noise ratio of differentia...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02H04L27/26
Inventor 陈前斌张伟张天骐杨繁
Owner CHONGQING UNIV OF POSTS & TELECOMM
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