MIMO-OFDM channel estimation method considering same frequency interference

A MIMO-OFDM, channel estimation technology, applied in multi-frequency code systems, space transmit diversity, baseband system components and other directions, can solve performance bottlenecks and other issues

Inactive Publication Date: 2013-12-25
SOUTHEAST UNIV
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Problems solved by technology

Traditional channel estimation methods treat co-channel interference as white noise, which will cause

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  • MIMO-OFDM channel estimation method considering same frequency interference
  • MIMO-OFDM channel estimation method considering same frequency interference
  • MIMO-OFDM channel estimation method considering same frequency interference

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Embodiment Construction

[0036] In order to enable those skilled in the art to better understand the solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. the embodiment. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0037] The MIMO-OFDM channel estimation method considering co-channel interference of the present invention mainly refers to estimating the MIMO-OFDM channel impulse response and channel frequency response at the receiving end of the MIMO-OFDM system by using the signal samples at the received pilot positions. The following scenario is taken as an example to illustrate the method described in the present i...

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Abstract

The invention discloses an MIMO-OFDM channel estimation method considering same frequency interference. The method comprises the following steps that 1), an observation sample of MIMO-OFDM pilot signals is utilized, an estimation criterion of the least square method is based, and then initial estimation of a channel impulse response is obtained; 2), the initial estimation of the channel impulse response is utilized, a residual error estimation method is based, and then an initial estimation value of an interference covariance matrix is obtained; 3), the initial estimation value of the interference covariance matrix is utilized, Cholesky decomposition and time domain 'low-pass filtering' are based, and then an improved estimation value of the interference covariance matrix is obtained; 4), the improved estimation value of the interference covariance matrix is utilized, a maximum likelihood estimation method is based, and then an improved estimation value of the channel impulse response and an improved estimation value of the channel frequency response are obtained. The MIMO-OFDM channel estimation method considering the same frequency interference is low in computation complexity and good in estimation error performance, and the performance gain is larger as the number of antennas is increased.

Description

technical field [0001] The invention relates to a MIMO-OFDM wireless communication system, in particular to a channel estimation method in the MIMO-OFDM system considering co-frequency interference. Background technique [0002] In the case of increasingly tight spectrum resources, further improving spectrum efficiency is one of the important goals of wireless communication system design. The wireless transmission technology of multi-antenna transmission and multi-antenna reception (MIMO) can improve the effectiveness and reliability of wireless transmission by mining space dimension resources without additional time and frequency resources, and finally achieve spectral efficiency. the goal of. Orthogonal Frequency Division Multiplexing (OFDM) technology converts high-speed data streams into a set of parallel transmission data streams, and overlaps the frequency bands of sub-channels, which has strong anti-multipath interference ability and high frequency band utilization. ...

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Application Information

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IPC IPC(8): H04L25/02H04B7/04H04L27/26
Inventor 曹敦孟鑫江彬高西奇尤肖虎
Owner SOUTHEAST UNIV
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