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Information channel estimation method and device for wireless communication system

A wireless communication system and channel estimation technology, applied in the field of channel estimation in wireless communication systems, can solve the problems of no improvement in system performance, loss of time-varying information, and "floor effect" in performance, so as to improve accuracy and reduce noise power. Effect

Inactive Publication Date: 2012-12-05
BEIJING UNIV OF POSTS & TELECOMM
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In the process of realizing the present invention, the inventors found that the channel estimation method in the prior art has at least the following problems: the method can obtain an SNR gain of 3dB under a time-invariant channel, but under a time-varying channel, due to the averaging process, the The time-varying information of the channel is lost, resulting in a "floor effect" in performance, that is, as the signal-to-noise ratio increases, the system performance does not improve

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  • Information channel estimation method and device for wireless communication system
  • Information channel estimation method and device for wireless communication system
  • Information channel estimation method and device for wireless communication system

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Embodiment 1

[0026] Taking the OFDM system as an example, the processing flow of a channel estimation method in a wireless communication system provided by this embodiment is as follows: figure 1 As shown, the following processing steps are included:

[0027] Step 11, setting weighted values ​​according to parameters such as the estimated signal-to-noise ratio of the received signal, the moving speed of the mobile station, and the pilot scheme.

[0028] In the embodiment of the present invention, it is necessary to use a preset weighting value to perform weighting processing on the estimated value of channel state information of adjacent pilot symbols in the OFDM system, so as to reduce the average noise power of the system.

[0029] The above-mentioned weighted value can be set according to parameters such as the signal-to-noise ratio estimate of the received signal, the moving speed of the mobile station, and the pilot scheme. A method for setting the weighted value p provided in this em...

Embodiment 2

[0053] The embodiment of the present invention also provides a channel estimation device in a wireless communication system, and its specific implementation structure is as follows Figure 4 As shown, it may specifically include:

[0054] A weighting processing module 42, configured to use a preset weighting value to perform weighting processing on the estimated value of the channel state information of the pilot symbol of the wireless communication system;

[0055] The interpolation operation processing module 43 is used to perform an interpolation operation on the data symbols between the pilot symbols by using the weighted processing result of the estimated value of the channel state information of the pilot symbols obtained by the weight processing module to obtain the data An estimate of the channel state information for the symbol.

[0056] The device may also include:

[0057] The weighted value setting module 41 is used to set the weighted value according to the sign...

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Abstract

The embodiment of the invention provides an information channel estimation method and a device for a wireless communication system. The method mainly comprises the following steps: setting a weighted value based on signal to noise ratio (SNR) value, carrier frequency and pilot frequency scheme of receipt signals of the wireless communication system and movement speed of a mobile station, carryingout weighted processing on an estimated value of information channel state information of pilot frequency symbols of the wireless communication system with the weighted value, and carrying out interpolation operation on data symbols among pilot frequency symbols based on the result of the weighted processing to the estimated value of information channel state information of the pilot frequency symbols to obtain an estimated value of information channel state information of the data symbols. In information channel environments, such as time variant information channel environment and a time invariant information channel environment, the embodiment of the invention can effectively reduce noise power of the wireless communication system and provide current SNR of the system, thereby improving accuracy of information channel state estimation of the wireless communication system.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a channel estimation method and device in a wireless communication system. Background technique [0002] With the continuous improvement of users' demand for communication bandwidth, how to effectively use limited spectrum resources has attracted more and more attention. OFDM (orthogonal frequency division multiplexing, Orthogonal Frequency Division Multiplexing) technology is widely used in wireless communication due to its efficient spectrum utilization, and has become one of the preferred technologies for wideband communication systems. [0003] Channel estimation is a challenging problem in wireless communication systems. Compared with other directional transmission media, wireless channels are very time-varying. In a wireless environment, frequency selective fading caused by multipath propagation and time selective fading caused by terminal mobility h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02H04L25/03
CPCY02B60/50
Inventor 石鑫俊罗涛胡淼尹长川刘丹谱郝建军李剑峰
Owner BEIJING UNIV OF POSTS & TELECOMM