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Channel prediction method and device

A channel prediction and channel technology, applied in channel estimation, digital transmission systems, baseband system components, etc., can solve the problems of high pilot overhead and reduce data transmission efficiency, and achieve the effect of reducing pilot overhead and saving manpower and material resources.

Active Publication Date: 2020-04-21
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0005] The present invention provides a channel prediction method and device to solve the problem that the existing traditional channel estimation algorithm needs a very large pilot overhead and seriously reduces the data transmission efficiency when the number of antennas increases sharply

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Embodiment Construction

[0055] Generally, mobile terminals (such as mobile phones, etc.) will not undergo rapid position changes in a short period of time, and large obstacles (such as buildings and walls, etc.) etc. will cause changes in the propagation path, and this environment is called a quasi-stationary environment. Signals experience multipath fading as they travel before reaching the receiver. In a quasi-stationary environment, some propagation paths are constant, such as building reflection paths, etc., while other propagation paths disappear or reappear as time changes, such as the propagation paths formed by signals encountering cars or pedestrians, etc. . It is precisely because of this phenomenon of birth and death of paths that only the changed paths need to be recalculated during the channel prediction process.

[0056] Since the signal in a quasi-stationary environment has the above-mentioned characteristics, the specific process of obtaining the channel estimation value in the chan...

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Abstract

The invention provides a channel predication method and device. The channel predication method comprises the steps of obtaining channel impulse responses of two adjacent moments corresponding to a current quasi-static environment, wherein each channel impulse response corresponds to N different paths; obtaining first average power delay spectrum and second average power delay spectrum corresponding to the two channel impulse responses; extracting the channel impulse response on an unchanged path corresponding to the current quasi-static environment according to the first average power delay spectrum and the second average power delay spectrum; obtaining the channel impulse response on a changeable path corresponding to the current quasi-static environment according to the channel impulse response on the unchanged path and a channel estimation value of the current quasi-static environment; and predicting the channel estimation value of a next moment according to the channel impulse response on the changeable path. According to the method and the device provided by the invention, the problem of low-pilot cost and real-time channel prediction in the quasi-static environment based on a channel database can be solved.

Description

technical field [0001] The present invention relates to communication technology, in particular to a channel prediction method and device. Background technique [0002] With the wide application of Multiple-Input Multiple-Output (MIMO) technology in mobile communication, especially the fifth generation mobile communication technology (5G) will adopt massive MIMO (massive MIMO) technology, not only the base station side antenna The number will increase sharply, and more antennas will be used on the terminal side, which will greatly increase the spatial dimension of the wireless channel. [0003] Most of the traditional channel estimation algorithms are data-assisted algorithms based on pilot sequences, such as the classic least square (Least Square, LS) algorithm and the linear minimum mean square error (Linear Minimum Mean Square Error, LMMSE) algorithm. The basic flow is: the transmitter transmits a pilot sequence, which is known and has length and orthogonality constraint...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02
CPCH04L25/0204H04L25/0212
Inventor 刘萌萌张建华
Owner BEIJING UNIV OF POSTS & TELECOMM
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