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Discrete cosine interpolation method in channel estimation based on pilot frequency

A technology of discrete cosine and interpolation methods, which is applied in the directions of multi-frequency code systems and baseband system components, and can solve problems such as inability to use

Inactive Publication Date: 2011-02-09
SOUTHEAST UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the extended inverse discrete cosine transform interpolation is not based on the traditional discrete cosine type II transform, and the traditional discrete cosine type II transform and its fast algorithm cannot be used. Starting from the traditional discrete cosine type II transform, a method based on The discrete cosine interpolation method in the channel estimation of the pilot frequency enables it to be based on the traditional discrete cosine type II transform, and provides a fast algorithm for the discrete cosine transform interpolation, which has the same performance as the extended inverse discrete cosine transform interpolation method, but more widely used

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  • Discrete cosine interpolation method in channel estimation based on pilot frequency
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  • Discrete cosine interpolation method in channel estimation based on pilot frequency

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[0034] The present invention will be further described by giving an example of the discrete cosine interpolation method and its fast algorithm below.

[0035] see figure 2 , an example of the discrete cosine interpolation method: the signal sequence to be interpolated is 4 points, the signal sequence obtained after interpolation is 8 points, the signal sequence to be interpolated {1, 2, 3, 4} is transformed into the discrete cosine transform domain, and the discrete cosine is obtained Transform domain coefficients {5, -2.2304, 0, -0.1585}, substituting {5, -2.2304, 0, -0.1585} into formula (6) can be calculated to obtain the interpolated signal sequence {1, 1.464, 2, 2.5, 3 , 3.536, 4, 4.1892}. ,

[0036] see image 3 , an example of the fast algorithm of the discrete cosine interpolation method: the signal sequence to be interpolated is 4 points, and the signal sequence obtained after interpolation is 8 points, and the signal sequence to be interpolated {1, 2, 3, 4} is pa...

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Abstract

The invention discloses a discrete cosine interpolation method in channel estimation based on pilot frequency aiming at the problem that the traditional DCT (Discrete Cosine Transform) interpolation algorithm is not based on the widely used DCT II and can not use continuously the traditional DCT rapid algorithm for interpolation. The interpolation is carried out by using the DCT II, and rapid calculation is carried out by adopting rapid Fourier, thus the invention can be widely applied to communication systems and digital signal processing.

Description

technical field [0001] The invention relates to an Orthogonal Frequency Division Multiplexing (OFDM) communication system, in particular to a discrete cosine interpolation method in pilot-based channel estimation, which belongs to the field of wireless communication. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) is a technology that can effectively combat frequency selective fading. In the OFDM communication system, due to the frequency selectivity and time-varying nature of the wireless channel, the frequency selective fading caused by multipath shows the inconsistency of fading on different subcarriers, resulting in distortion on each data subcarrier non-uniform, so channel estimation is required to track changes in the channel response. [0003] Pilot-based channel estimation can accurately reflect the time-varying characteristics of wireless channels. Then, according to the channel response at the pilot frequency, some interpolation me...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L25/02
Inventor 陈文辉陈晓曙
Owner SOUTHEAST UNIV
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