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Method for acquiring status information of medium- and long-term channel of communication system

A channel state information and communication system technology, applied in the field of wireless communication, can solve problems such as ignoring channel time-related characteristics, reduce the complexity of channel measurement, improve system performance, and meet system requirements

Inactive Publication Date: 2011-01-12
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, current methods generally only use the spatial correlation characteristics of the channel, while ignoring the time correlation characteristics of the channel

Method used

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  • Method for acquiring status information of medium- and long-term channel of communication system
  • Method for acquiring status information of medium- and long-term channel of communication system

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Embodiment Construction

[0029] In the present invention, an N-element antenna array is used at the eNB side, and a single antenna is used at the UE side, and a static narrowband channel between the two is considered. Assuming that there are S scatterers around the mobile user, the complex envelope of channel fading in a TDMA time slot m can be expressed as follows:

[0030]

[0031] Among them, T s is the time slot duration, α s is the signal amplitude, θ s is the angle of arrival (AoA) observed by the eNB, f d，s and are the Doppler frequency shift and random phase shift of the s-th scatterer, respectively, α(θ s ) represents the steering vector. In the case where only the strongest L diameter (L≤S) is considered, a simplified discrete AoA model can be assumed.

[0032] Suppose a uniform linear array (ULA) is used, the array element spacing is d, and the direction is θ s , then there is

[0033] α ( θ s ) ...

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Abstract

The invention discloses a method for acquiring status information of a medium- and long-term channel of a communication system, and belongs to the field of wireless communication. The method comprises that: 1) a base station computes an uplink space-time covariance matrix according to the status information of an uplink channel of a frequency division duplex communication system; and 2) the base station converts the uplink space-time covariance matrix according to the reciprocity between the uplink channel and a downlink channel of the frequency division duplex communication system so as to obtain the status information of a downlink medium- and long-term channel. Compared with the prior art, the method for acquiring the status information of the medium- and long-term channel of the communication system reduces the complexity of channel measurement at a UE end and the feedback overhead in the communication system.

Description

technical field [0001] The invention relates to a method for acquiring channel state information, in particular to a method for acquiring long-term channel state information in a communication system, which is applicable to the field of wireless communication. Background technique [0002] Current research in the field of wireless communication shows that channel state information (CSI) is one of the important parameters that affect the performance of multiple-input multiple-output (MIMO) downlink systems. In an existing system, a set of channel state information is generally saved as a codebook to provide short-term channel state information for a base station (eNB) and a user terminal (UE). However, these codebooks are specially designed for specific transmitters. In this sense, they are fixed codebooks and cannot be changed adaptively as the channel changes. In order to adapt to the characteristics of the actual correlation channel, recent technical research points out t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/06
Inventor 冯岩宋令阳
Owner PEKING UNIV
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