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Channel estimation method for reducing pilot number by using compression perception in wideband mobile communication

A technology of compressed sensing and channel estimation, which is applied in the field of channel estimation of broadband mobile communication, and can solve the problems of not considering the sparse characteristics of the channel, large pilot overhead, etc.

Inactive Publication Date: 2013-06-05
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, the existing pilot insertion methods do not consider the sparse characteristics of the channel, thus requiring a large pilot overhead

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  • Channel estimation method for reducing pilot number by using compression perception in wideband mobile communication
  • Channel estimation method for reducing pilot number by using compression perception in wideband mobile communication
  • Channel estimation method for reducing pilot number by using compression perception in wideband mobile communication

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Embodiment Construction

[0059] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and the simulation of the embodiments.

[0060] see figure 1 , introduces the channel estimation method of the present invention for reducing the number of pilots by using compressed sensing in broadband mobile communication systems. The sparse characteristics of the channel reduce the number of pilot symbols required by the system when estimating the channel; the method includes the following steps:

[0061] (1) Send the pilot symbol p at the sending end l，k , where the subscript (l, k) ∈ θ, θ is the subset of grid points under-sampled in the time-frequency domain of the OFDM symbol, that is, the set of positions of the inserted pilot symbols; l and k represent the time axis and frequency The grid point index on the axis; the inserted pilot symbols should be even...

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Abstract

The invention discloses a signal channel estimating method, which is used for reducing the number of pilot frequencies through compressive sensing in a mobile broadband communicating system, is realized by reducing the required number of pilot frequency symbols in the signal channel estimation of the system as well as on the basis of the principle that the compressive sensing technique can recover sparse signals with less measuring values and the sparse characteristic of the signal channel of the mobile broadband communicating system, and can ensure the signal channel estimation performance of the system. The signal channel estimating method can well solve the defect in the prior art that the sparse characteristic of the signal channel is not considered in the signal channel estimating ways of the prior art and consequently more pilot frequencies consumption is required, and improves the traditional methods as follows: by utilizing the sparse signal channel characteristic, a new signal channel estimating method is designed to reduce the number of pilot frequencies, greatly reduce the energy consumption of the system and ensure effective signal channel estimation. The signal channel estimating method has well popularization and application prospect.

Description

technical field [0001] The present invention relates to a channel estimation method using compressed sensing for a broadband mobile communication system, to be precise, relates to a method for utilizing the sparse characteristics of a channel in a broadband mobile communication system, and reducing the channel estimation requirements based on the compressed sensing theory. The channel estimation method realized by the number of pilot frequencies belongs to the technical field of channel estimation of broadband mobile communication. Background technique [0002] In the transmission process of broadband mobile communication, if the delay spread of the channel exceeds the symbol period, it will cause frequency selective fading, which is more serious when transmitting data at a high rate; moreover, the relative movement and oscillation between the two ends of the transceiver Both device drift and phase noise will cause time selective fading. The combination of the above two typ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02H04L27/26
Inventor 牛凯贺志强别志松王东昊徐文波董超于光炜
Owner BEIJING UNIV OF POSTS & TELECOMM
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