MIMO-OFDM channel estimator designed based on quadratic curve fitting method

A technology of MIMO-OFDM and channel estimator, applied in baseband system components, multi-frequency code system, etc., can solve the problems of inter-carrier interference in OFDM system, affecting communication quality, and inability to obtain channel gain, etc.

Inactive Publication Date: 2015-04-22
SYSU HUADU IND SCI & TECH INST
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Problems solved by technology

In previous studies, the MIMO wireless transmission channel has a large coherence time, especially when the subcarrier DC corresponds to X0 = 0, the channel estimation algorithm cannot find the corresponding channel gain at DC
At the same time, under the 802.11n protocol, the recei

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  • MIMO-OFDM channel estimator designed based on quadratic curve fitting method
  • MIMO-OFDM channel estimator designed based on quadratic curve fitting method
  • MIMO-OFDM channel estimator designed based on quadratic curve fitting method

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Embodiment Construction

[0033] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, so as to define the protection scope of the present invention more clearly.

[0034] refer to figure 1 and figure 2As shown, the present invention provides a MIMO-OFDM channel estimator designed based on a quadratic curve fitting method, including a transmitting end and a receiving end, and the transmitting end includes multiple groups of pilots equidistantly distributed in OFDM symbols, each group of pilots The zero pilot and non-zero pilot in the frequency are inserted alternately at the subcarrier, and the zero pilot is used as the guard interval. The receiving end is used to receive the signal sent by the sending end, and calculate the zero pilot at the zero pilot after FFT transformation. Estimated value and filter ...

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Abstract

The invention discloses an MIMO-OFDM channel estimator designed based on a quadratic curve fitting method. The channel estimator comprises a transmitting end and a receiving end, and is characterized in that the transmitting end comprises multiple groups of pilot frequencies which are distributed in OFDM symbols in equal distance; zero pilot frequencies and non-zero pilot frequencies in each group of pilot frequencies are mixed at a subcarrier to be alternatively inserted, and the zero pilot frequencies serve as protection intervals; the receiving end is used for receiving a signal transmitted by the transmitting end and calculating the estimated value and filter coefficient at the zero pilot frequencies by virtue of FFT transform; and the estimated value and filter coefficient at the zero pilot frequencies are respectively calculated by virtue of the quadratic curve fitting method of a six-point smoothing filter. The condition that the channel estimation is damaged by an improper averaging method is avoided. According to the STBC technology, LS operation of a multidimensional matrix is transformed into a one-dimensional matrix operation, the complexity is reduced, the estimation accuracy of a traditional channel estimation method is improved based on the optimization thought of the system, and the signal-to-noise ratio application range is widened.

Description

technical field [0001] The present invention relates to the technical field of communication, and more specifically relates to a MIMO-OFDM channel estimator designed based on a quadratic curve fitting method. Background technique [0002] The development and application of Wireless Local Area Network (WLAN) technology has profoundly changed the way people communicate and work, bringing unprecedented convenience to people. In addition, various smart terminals (such as Smart Phone, iPad, IPTV, etc. ) and the introduction and implementation of the concept of "Smart Home", people have higher and higher requirements for the convenience brought by WLAN and the efficiency of signal transmission. Under high-speed transmission, the Orthogonal Frequency Division Multiplexing (OFDM) signal is transmitted in the channel. Due to the influence of frequency selective fading, Doppler frequency shift and carrier frequency offset, its phase will shift and its amplitude will attenuate. In ord...

Claims

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Application Information

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IPC IPC(8): H04L25/02H04L27/26
Inventor 徐永键陆许明齐立成谭洪舟
Owner SYSU HUADU IND SCI & TECH INST
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