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FDD massive MIMO downlink channel reconstruction and multi-user transmission method

A transmission method and multi-user technology, applied in the field of downlink channel reconstruction and multi-user transmission, can solve problems such as the loss of the effect of interference cancellation, and achieve the effects of eliminating interference between users, realizing maximum mining, and saving downlink pilot overhead.

Active Publication Date: 2021-03-26
SOUTHEAST UNIV
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Problems solved by technology

Therefore, under the premise of imprecise CSI-T acquisition, the effect of user interference cancellation in FDD massive MIMO system is also lost

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  • FDD massive MIMO downlink channel reconstruction and multi-user transmission method

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Embodiment Construction

[0028] The present invention provides a downlink channel reconstruction and multi-user transmission method for FDD massive MIMO system, which specifically includes the following steps:

[0029] 1) The user sends the uplink pilot to the base station, the pilots between the users are orthogonal, and the base station extracts the direction angle and time delay of all propagation paths in each user channel;

[0030] 2) The base station uses the estimated direction angle information to perform user selection and scheduling, which specifically includes the following steps:

[0031] 2.1) The base station presets a set of sample direction angles, these sample direction angles are a set of samples of spatial directions, uniformly covering the entire spatial range;

[0032] 2.2) For each direction angle extracted in step 1, the base station normalizes it to the nearest sample direction angle, and marks the sample direction angle; for the same user channel, if the two extracted are diffe...

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Abstract

The invention discloses a downlink channel reconstruction and multi-user transmission method for FDD large-scale MIMO system. The method comprises the following steps: transmitting an uplink pilot frequency by a user to a base station; pilots between users are orthogonal; the base station extracts the directional angles and time delays of all propagation paths in each user channel; the user sendsthe uplink pilot frequency to a base station. The base station uses the estimated direction angle information to perform user selection and scheduling; The base station transmits the downlink dilute dredging pilot frequency, the selected user estimates the downlink gain of each propagation path according to the received pilot frequency and feeds back to the base station, and the base station reconstructs the downlink channel for each selected user; The base station uses the reconstructed downlink channel to design a precoding matrix for downlink multi-user data transmission. The invention breaks through the bottleneck of multi-user channel reconstruction of FDD large-scale MIMO system with low cost, and realizes downlink multi-user interference-free data transmission with high throughput.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a downlink channel reconstruction and multi-user transmission method for an FDD massive MIMO system. Background technique [0002] Multiple-input multiple-output (MIMO) technology has been regarded as a key means to improve spectral efficiency since the fourth generation (4G) mobile communication system. By erecting multiple antennas at the base station, the space dimension can be developed, and space utilization can be enhanced by means of space division multiplexing to improve spectrum efficiency. With the explosive growth of users' demand for mobile communication services, in order to meet user needs, the industry proposed the concept of massive MIMO in the initial stage of fifth-generation (5G) mobile communication research. The base station is equipped with a large-scale antenna array to maximize the freedom of space and support dozens of users at...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/0413H04B7/0417H04B7/0456H04B7/06H04L5/00
CPCH04B7/0413H04B7/0417H04B7/0456H04B7/0617H04B7/0626H04L5/0048
Inventor 韩瑜金石温朝凯高飞飞
Owner SOUTHEAST UNIV
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