Blind channel estimation method based on OFDM (orthogonal frequency division multiplexing) signal cyclostationary features

A technology with cyclostationary characteristics and blind channel, applied in the field of channel estimation, which can solve the problems of reducing the utilization rate of spectrum resources and reducing the performance of system estimation.

Inactive Publication Date: 2012-12-12
NINGBO UNIV
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[0010] The above double k method selects two non-zero cyclic frequencies to construct the periodic spectral function of the received signal at each cyclic frequency, and uses the two periodic spectral functions to estimate the phase and amplitude information of the c

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  • Blind channel estimation method based on OFDM (orthogonal frequency division multiplexing) signal cyclostationary features
  • Blind channel estimation method based on OFDM (orthogonal frequency division multiplexing) signal cyclostationary features
  • Blind channel estimation method based on OFDM (orthogonal frequency division multiplexing) signal cyclostationary features

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[0035] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0036] The present invention proposes two blind channel estimation methods in the specific implementation process. The first blind channel estimation method based on the cyclostationary characteristics of OFDM signals, its basic principle is: at a fixed cyclic frequency, analyze the periodic spectral function S of the OFDM received signal y The z-transformation of the delay variable τ in (k,z), by selecting two different correlation values ​​of the z-transformation of the delay variable τ: Finally, the accurate estimation of channel information is realized by using H(z) which contains channel amplitude and minimum phase information and combining with the existing least square method. The specific steps are as follows:

[0037] ① At the sending end of the OFDM system, firstly use the existing quadrature phase shift modulation method to proce...

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Abstract

The invention discloses a blind channel estimation method based on OFDM (orthogonal frequency division multiplexing) signal cyclostationary features, and the method is characterized in that on a fixed cycle frequency, z-transform of a delay variable Tau in a period spectrum function of an OFDM received signal is analyzed, and the accurate estimation of channel information is realized by selecting two different correlation values of the z-transform of the delay variable Tau, finally utilizing H(z) containing channel amplitude and minimal phase information and utilizing the existing least square method. Only the frequency spectrum information of one cycle frequency is adopted by the method, the quantity of the cycle frequency is reduced, so that the utilization rate of the frequency resource is effectively improved, the accuracy of the channel estimation is improved, and the performance of the method is obviously better than that of the existing blind channel estimation method through simulation verification; and by analyzing the energy distribution regulation of the self-correlation function of the OFDM received signal, the frequency spectrum information centralizing partial energy is adopted, the rest frequency spectrum information is set as zero, and the quantity of matrixes to be constructed is reduced, so that the calculation complexity is reduced.

Description

[0001] This application is a divisional application of the original application number 200910157038.9 for a patent application for invention. Its filing date is December 31, 2009. The title of the invention is "A Blind Channel Estimation Method Based on Cyclostationary Characteristics of OFDM Signals". technical field [0002] The present invention relates to a channel estimation method, in particular to a blind channel estimation method based on OFDM signal cyclostationary characteristics. Background technique [0003] With the advent of the post-3G era, Orthogonal Frequency Division Multiplexing (OFDM, Orthogonal Frequency Divided Multiplexing) system, as its key technology, has attracted great attention due to its advantages of low cost and high frequency band utilization, and has become the current wireless Research hotspot in the communication field. Orthogonal Frequency Division Multiplexing (OFDM) system converts high-speed serial data streams into low-speed sub-data ...

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Application Information

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IPC IPC(8): H04L27/26H04L25/02
Inventor 李有明朱文升
Owner NINGBO UNIV
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