Channel estimation method based on exponential smoothing in MIMO-OFDM system

A MIMO-OFDM, exponential smoothing technology, applied in transmission systems, multi-frequency code systems, radio transmission systems, etc., can solve the problem of low estimation accuracy, achieve good estimation performance, filter out random interference, and improve estimation accuracy.

Inactive Publication Date: 2017-08-08
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0005] The present invention aims at the problem of low estimation accuracy of the LS channel estimation algorithm in the MIMO-OFDM system in the prior art, and provides a channel estimation method based on exponential smoothing in the MIMO-OFDM system

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  • Channel estimation method based on exponential smoothing in MIMO-OFDM system
  • Channel estimation method based on exponential smoothing in MIMO-OFDM system
  • Channel estimation method based on exponential smoothing in MIMO-OFDM system

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Embodiment Construction

[0050] The present invention is described in further detail now in conjunction with accompanying drawing.

[0051] Such as figure 1 In the data transmission flow chart shown, after the MIMO-OFDM system obtains the LS estimated value of the channel frequency response of each symbol (an overall OFDM symbol period), the LS estimated value of the channel impulse response of each symbol is obtained by inverse discrete Fourier transform , and then use the exponential smoothing algorithm to optimize the channel impulse response estimate, and finally get the channel frequency response based on exponential smoothing through discrete Fourier transform.

[0052] In the LS channel estimation algorithm of the MIMO-OFDM system, it is assumed that the number of pilots inserted into each antenna is M, OFDM uses K subcarriers, and the number of subcarriers separated by comb pilots is p, satisfying M=[K / p] , [] represents the rounding operation, so the frequency-domain received signal at the p...

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Abstract

The invention discloses a channel estimation method based on exponential smoothing in an MIMO-OFDM system. The problem that a least squares channel estimation algorithm is low in precision is solved. After LS (Least Squares) estimation values of channel frequency responses of symbols are obtained, LS time domain estimation values of channel impulse responses of the symbols are obtained through discrete Fourier transform, then the channel impulse response estimation values are optimized through an exponential smoothing algorithm, and the channel frequency responses based on the exponential smoothing are obtained through the discrete Fourier transform. According to the method, through adoption of the exponential smoothing algorithm, own change rules of channels are uncovered; random interference in the channel estimation results are effectively filtered; only the channel impulse responses corresponding to the symbols are stored; on the premise of increasing little operation complexity, the estimation precision of the LS channel estimation algorithm is effectively improved; a bit error rate of transmitting the system data is reduced; and a satisfactory result can be obtained no matter a channel condition is good or poor.

Description

technical field [0001] The invention belongs to the field of channel estimation of wireless communication systems, and in particular relates to an exponential smoothing-based channel estimation method in a MIMO-OFDM system. Background technique [0002] With the rapid development of wireless mobile communication, users' demand for reliable high-speed wireless communication links has ushered in unprecedented growth. In this regard, a more complete wireless communication system is needed to realize various forms of communication for users in various environments. The fourth-generation mobile communication system adopts an innovative design concept, upgrading from a mobile communication network based on traditional mobile phone services to a high-speed mobile communication network based on mobile data and covering a large area of ​​the Internet, which can support more abundant mobile communication Business, so that users can obtain any form of information service they need any...

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Application Information

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IPC IPC(8): H04L25/02H04L27/26H04B7/0413
Inventor 仲伟志苏生陆晓忆徐磊
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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