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A channel estimation method and device in an orthogonal frequency division multiplexing system

A channel estimation and orthogonal frequency division technology, applied in the field of channel estimation in OFDM systems, can solve the problem of channel estimation that cannot be used to handle multiple users, and achieve the effect of suppressing the Gibbs phenomenon and improving the quality of channel estimation

Active Publication Date: 2015-10-21
ZTE CORP
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Problems solved by technology

[0005] However, the above-mentioned patent is only suitable for processing the pilot signal transmitted by a single user. When multiple users transmit the pilot signal at the same time, the method disclosed in the above-mentioned patent cannot be used to process the channel estimation of multiple users.

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  • A channel estimation method and device in an orthogonal frequency division multiplexing system
  • A channel estimation method and device in an orthogonal frequency division multiplexing system
  • A channel estimation method and device in an orthogonal frequency division multiplexing system

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Embodiment Construction

[0062] The basic idea of ​​the present invention is: the received pilot signal is sequentially processed by eliminating the pilot code, tail concatenation, IDFT, separating multiple users, DFT, and frequency domain truncation to obtain the channel estimation signal of each user.

[0063] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0064] The method for channel estimation in the OFDM system of the present invention, such as figure 1 shown, including the following steps:

[0065] Step 101: After receiving the pilot signal, perform the process of eliminating the pilot mother code to obtain the first signal;

[0066] Here, it is assumed that the pilot signal occupies M subcarriers, correspondingly, the sequence length of the pilot mother code is M, and the pilot mother code is r(n), n=0, ..., M-1, that is A sequence comprising M signals;

[0067] Assuming that the received signal at th...

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Abstract

A method for channel estimating in an Orthogonal Frequency Division Multiplexing (OFDM) system is disclosed in the present invention, which includes: performing the pilot main code elimination, tail connection, Inverse Discrete Fourier Transform (IDFT), multiuser separation, Discrete Fourier Transform (DFT) and tail cutting processing in frequency domain in turn for the received pilot signal in order to obtain the channel estimating signal of every user. A device for channel estimating in an OFDM system is also disclosed in the present invention. By applying the method and device of the present invention, thus, the channel estimating signals of multiple users are effectively separated and the quality of the channel estimating is improved.

Description

technical field [0001] The present invention relates to Orthogonal Frequency Division Multiplexing (OFDM) technology, in particular to a channel estimation method and device in an OFDM system. Background technique [0002] In an Orthogonal Frequency Division Multiplexing (OFDM) system, the available frequency band is divided into multiple small frequency bands, also referred to as sub-carriers, and data symbols are modulated onto these sub-carriers for transmission. In order for the receiver to accurately demodulate the data, it is necessary to place known pilot signals on certain sub-carriers, and the receiver processes the pilot signals accordingly to obtain channel estimates at the pilot positions, and through interpolation, etc. means to obtain channel estimates at other locations. [0003] After the user receives the pilot signal, the usual processing procedure is: first transform to the time domain for noise reduction processing, then transform back to the frequency d...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02H04L27/26
CPCH04L25/0228H04L27/2647
Inventor 李杰耿鹏马毅华
Owner ZTE CORP
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