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Wiener filtering channel estimation method based on superimposed pilot

A channel estimation and Wiener filtering technology, applied in channel estimation, baseband system, baseband system components, etc., to achieve the effect of eliminating interference, improving estimation performance, and improving accuracy

Inactive Publication Date: 2018-11-23
CHONGQING UNIV
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Problems solved by technology

[0005] In summary, due to the superimposed pilot scheme not occupying bandwidth and the simplicity of receiver design, the system efficiency is improved, but it brings challenges to the channel estimation method

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  • Wiener filtering channel estimation method based on superimposed pilot
  • Wiener filtering channel estimation method based on superimposed pilot

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Embodiment Construction

[0056] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0057] In describing the present invention, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", The orientation or positional relationship indicated by "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than Nothing indicating or implying that a referenced device or elem...

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Abstract

The invention proposes a Wiener filtering channel estimation method based on superimposed pilot, comprising: firstly, establishing a time domain channel model, pre-estimating the superimposed pilot sequence by using LS to estimate the channel impulse response; secondly, constructing a Wiener filter by using the channel estimation result of LS as the initial value of Wiener filter and using the minimum mean square error as the criterion to improve the estimation performance of channel estimation; then adopting a hard decision detection method to remove the information sequence in order to eliminate the interference of the information sequence on the estimation performance; and finally, adopting an iterative estimation method in order to solve the problem that the pilot power is limited as the estimation performance is improved, and obtaining the optimal channel estimation value when the estimation accuracy requirement is met. The invention may estimate the channel time domain impulse response by using LS estimation based on the channel estimation by using Wiener filtering of superimposed pilots, obtain the channel state information (CSI) under minimum mean square error by optimizingthe estimated value by Wiener filtering, reduce the interference of the information sequence to the estimation performance by removing the information sequence decision value, and solve the problem that the pilot power is limited as the estimation performance is improved through the iterative estimation performed then, thereby improving the channel estimation accuracy overall.

Description

Technical field: [0001] The invention relates to the field of wireless communication, in particular to a method for channel estimation of a Wiener filter based on superimposed pilots. Background technique: [0002] The performance of a wireless communication system will be limited by the wireless transmission channel in its working environment, so it is necessary to estimate the channel response of the system, obtain channel state information (CSI), and an accurate and reliable channel estimate for subsequent coherent demodulation, detection And decoding is very important. Therefore, channel estimation is a major challenge to obtain a reliable wireless communication system. In most practical systems, two methods are commonly used for channel estimation. One is the estimation method based on the training sequence / pilot, that is, the channel response at the pilot is estimated by using the pilot symbols known to both the transmitting and receiving ends, and then the data symb...

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Application Information

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IPC IPC(8): H04L25/02H04L25/03
CPCH04L25/0202H04L25/024H04L25/0256H04L25/03012
Inventor 廖勇张楠
Owner CHONGQING UNIV
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