Channel estimation method and device in multiple input multiple output OFDM (Orthogonal Frequency Division Multiplexing) system
A technology of channel estimation and orthogonal frequency division, which is applied in the direction of multi-frequency code system and baseband system components, etc., to achieve the effects of suppressing part of the noise, weakening the floor effect, and low complexity
Inactive Publication Date: 2013-02-06
THE PLA INFORMATION ENG UNIV
View PDF0 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0004] The technical problem to be solved by the present invention is to provide a channel estimation method and device in a multiple-input multiple-output OFDM system, which solves the problem of suppressing the phenomenon of time-path diffusion in time-domain channel estimation, and can effectively suppress some noise, which ultimately improves the accuracy of channel estimation
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0036] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0037] The implementation condition of the present invention is aimed at the MIMO-OFDM system with virtual sub-carriers. (Wherein, MIMO channel condition: block fading (that is, the frequency channel response is constant on the same subcarrier within multiple OFDM symbols) + white noise). The implementation of the present invention can be realized through memory and multiple calculators (such as multipliers, adders, etc.).
[0038] The following is N T ×N R Take the MIMO-OFDM system as an example, (where, N T is the transmitting antenna, N R For receiving antenna) channel estimation method in the multiple-input multiple-output OFDM system of the present invention, comprises the following steps:
[0039] Step 110, the system encodes the continuous pilot subcarrier block data on the transmitting antennas and the Walsh (Walsh) orthogonal code...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention relates to channel estimation method and device in a multiple input multiple output OFDM (Orthogonal Frequency Division Multiplexing) system. The method comprises the following steps that the system codes the pilot subcarrier data of each transmitting antenna to generate time domain OFDM signals and then transmitting the time domain OFDM signals to a receiving antenna; the system extracts continuous pilot subcarrier block data on each receiving antenna to obtain pilot receiving data on each transmitting antenna; the system obtains time domain channel response values after obtaining the frequency response of all pilot subcarriers on each transmitting antenna by carrying out frequency domain LS (Least Square) channel estimation on the pilot receiving data on each transmitting antenna; the system carries out peak search, peak point diffusion coefficient calculation and offset iteration on the obtained time domain channel response values and carries out FFT (Fast Fourier Transform Algorithm) transformation processing on the outputted valid time domain multipath channel response values to obtain channel frequency response values of each subcarrier on each transmitting antenna to complete channel estimation. By applying the invention, the problem of path diffusion phenomenon when the time domain channel estimation is carried out is solved, and meanwhile, partial noise is restrained, and finally, the channel estimation precision is improved.
Description
technical field [0001] The invention relates to the field of wireless communication, in particular to a channel estimation method and device in a multiple-input multiple-output orthogonal frequency division multiplexing system. Background technique [0002] For MIMO-OFDM (Multi-Input Multiple-Output Orthogonal Frequency Division Multiplexing) systems with virtual subcarriers, the existing channel estimation methods are mainly frequency domain interpolation methods, namely linear interpolation, Gaussian interpolation, Wiener filter interpolation and transform domain However, the existing variable domain interpolation can only effectively suppress part of the noise, but it cannot suppress the time-domain path diffusion effect caused by the existence of virtual subcarriers, so that when the signal-to-noise ratio is high, the channel estimation has a "floor effect" , the performance deterioration caused by the time-domain path diffusion makes the accuracy of channel estimation d...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04L25/02
Inventor 任修坤耿欣仵国锋崔维嘉
Owner THE PLA INFORMATION ENG UNIV