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Channel estimation method and training signal creating method for channel estimation in mimo-ofdm system

An orthogonal frequency division and multiplexing technology, applied in the field of training signal generation, can solve difficult technology, complex structure, application and other problems, and achieve the effect of reducing noise variance and improving quality

Inactive Publication Date: 2008-10-29
ELECTRONICS & TELECOMM RES INST
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Problems solved by technology

[0018] This technique is relatively simple compared to the MMSE channel estimation method, but there is still a complex structure
Moreover, this technology has a feedback structure in which the accuracy of the previous channel estimate seriously affects the accuracy of the current channel estimate
Due to such a feedback structure, it is difficult to apply this technique to systems in environments with low SNR (signal-to-noise ratio) or rapidly changing channels

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  • Channel estimation method and training signal creating method for channel estimation in mimo-ofdm system
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Embodiment Construction

[0034] The above objects, features, and advantages of the present invention will be more apparent through the following detailed description in conjunction with the accompanying drawings, so those skilled in the art can easily imagine the appendages of the present invention. Also, in the following description, well-known prior arts will not be described in detail since they might obscure the present invention in unnecessary detail. Hereinafter, preferred embodiments of the present invention will be given in detail with reference to the accompanying drawings.

[0035] First, before describing the present invention in detail, a conventional OFDM technique is briefly explained.

[0036] In order to prevent inter-symbol interference (ISI) in OFDM, a cyclic prefix (CP) longer than the length of the channel response is provided therein. Considering the maximum response length of the channel, the length of CP is about 1 / 4 of the whole OFDM symbol length. Therefore, in the time doma...

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Abstract

Provided are a training signal generation method using impulse trains encoded with orthogonal codes and a channel estimation method using an orthogonal code decoding in a Multiple-Input Multiple-Output-Orthogonal Frequency Division Multiplex (MIMO-OFDM) system. The channel estimation method using the orthogonal code decoding in the MIMO-OFDM system includes the steps of creating a plurality of orthogonal codes depending on the number of receive antennas, decoding a signal received through each receive antenna by using the orthogonal codes, and estimating a channel response by averaging the received signals decoded with the orthogonal codes every OFDM symbol.

Description

technical field [0001] The present invention relates to a channel estimation method and a training signal generation method for channel estimation in a Multiple Input Multiple Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) system. More specifically, the object of the present invention is to use a training signal generation method of a pulse train encoded with an orthogonal code (for example, Walsh code) and a channel decoded with an orthogonal code in a MIMO-OFDM system. Estimation method in which channel estimation is simply and accurately performed by generating and transmitting a pulse train encoded with an orthogonal code at a transmitting end as a training signal, and decoding a received signal with an orthogonal code at a receiving end and then averaging the decoded signals . Background technique [0002] The MIMO technology refers to a technology that can increase a transmission rate without increasing any bandwidth by transmitting discrete data from e...

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Application Information

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IPC IPC(8): H04J11/00
Inventor 李炫崔源喆全炯九
Owner ELECTRONICS & TELECOMM RES INST
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