Channel estimation method for multi-input multi-output-orthogonal frequency-division multiplexing system

A channel estimation, multiple input and multiple output technology, applied in multi-frequency code systems, baseband system components, wireless communications and other directions, can solve the problems of reducing channel estimation performance, DFT transform energy leakage, etc., to achieve excellent filtering performance and improve performance , the effect of eliminating the "floor" effect

Inactive Publication Date: 2010-06-23
INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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Problems solved by technology

In this case, energy leakage occurs in the DFT transformation of the cha

Method used

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  • Channel estimation method for multi-input multi-output-orthogonal frequency-division multiplexing system
  • Channel estimation method for multi-input multi-output-orthogonal frequency-division multiplexing system
  • Channel estimation method for multi-input multi-output-orthogonal frequency-division multiplexing system

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[0086] Example

[0087] The present invention will be further described below in conjunction with embodiments and drawings:

[0088] In this embodiment, taking a 2-transmit and 2-receive WLAN system with a 20MHz bandwidth as an example, the number of subcarriers is N=64, CP=16, and the frame structure of the transmitted data is as image 3 As shown; the channel coefficients are four one-dimensional vectors [H 11 , H 21 , H 12 , H 22 ], we use H 11 As an example, the method of the present invention is used for channel estimation:

[0089] Step 1: The estimated value H of the channel parameter between each transmitting and receiving antenna pair by the conventional LS estimation method 11 LS ;

[0090] H 11 LS = 0 0 0 0 0.021304 + 0.00738344 i

[0091] 0.092918 - 0.039402 i 0.061958 - 0.020777 i 0.057491 - 0.17426 i

[0092] - 1.8429 e - 005 - 0.16476 i - 0.065331 - 0.19724 ...

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Abstract

The invention discloses a channel estimation method for a multi-input multi-output spacial multiplexing system. The method comprises the following steps: acquiring a primary channel coefficient in a frequency domain by a least square estimation method, and transforming the primary channel coefficient to a time domain through inverse Fourier transform; introducing a concept of an effective tap of a channel impulse response, and taking the maximum of the channel impulse response outside a circular preamble range as a judgment condition; searching an effective tap range, and filtering noise interference in the part outside the effective tap range by a zero padding method in the time domain; and converting to the frequency domain, replacing by a least square estimation channel coefficient of a data carrier, and restoring a channel coefficient of a null subcarrier by an iterated interpolation method; and finally acquiring channel estimation approximate to an actual channel coefficient. The time domain characteristics of the channel response of a wireless wide-band communication system are fully utilized, the traditional channel estimation method is improved through noise suppression, and the influence of the noise on a channel estimator is eliminated.

Description

technical field [0001] The invention relates to the technical field of wireless broadband communication, in particular to a channel estimation method applied to a multiple-input multiple-output Orthogonal Frequency Division Multiplexing system applied to a wireless local area network (WLAN, Wireless Local Area LAN). Background technique [0002] With the advent of the era of high-speed wireless transmission, broadband wireless access has become one of the main directions for the future evolution of broadband access and mobile communications. Research on new broadband wireless access technology is of great significance for broadband wireless communication to achieve higher stability and higher data transmission rate, and to meet the needs of various integrated services from voice to multimedia. [0003] The joint application of multiple-input multiple-output (Multiple-Input Multiple-Output, MIMO) technology and Orthogonal Frequency Division Multiplexing (OFDM) technology is t...

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Application Information

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IPC IPC(8): H04L25/03H04L27/26H04W84/12
Inventor 鉴海防肖宛昂石寅
Owner INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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