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A Transmission Method Combining Channel Estimation and Power Control Based on User Arrival Angle

A channel estimation and power control technology, which is applied in the transmission field combining channel estimation and power control, and can solve problems such as no significant improvement in performance gain of edge users, few cell edge user schemes, and limited pilot sequence dimensions. , to achieve the effect of reducing pilot resource requirements, saving pilot overhead, and reducing pilot pollution

Active Publication Date: 2019-07-30
白盒子(上海)微电子科技有限公司
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Problems solved by technology

Due to the limited dimension of the pilot sequence, users in different cells will use non-orthogonal pilot sequences, or multiplex the same pilot sequence. The interference of the pilot signal sent by the user is the pilot pollution, and this problem seriously restricts the performance of the system, and the user at the edge of the cell is particularly affected by the pilot pollution.
[0003] Aiming at the problem of pilot pollution, relevant researchers have proposed a variety of solutions to reduce the impact of pilot pollution and improve the achievable transmission rate of the communication system, but there are few solutions specifically for cell edge users, and the performance gain of edge users no significant improvement

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  • A Transmission Method Combining Channel Estimation and Power Control Based on User Arrival Angle
  • A Transmission Method Combining Channel Estimation and Power Control Based on User Arrival Angle
  • A Transmission Method Combining Channel Estimation and Power Control Based on User Arrival Angle

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0029] Such as figure 1 As shown, the transmission method based on the combination of channel estimation and power control based on user angle of arrival, first divides each user into cell center users or cell edge users; then according to the angle of arrival of the cell edge users at each base station antenna, group all the cell edge users through the proposed greedy grouping algorithm, so that the interference between users in the group is as small as possible; then according to the specific pilot allocation method , all users send pilot signals, and the base station estimates channel information according to the received pilot signals; finally, users in different cells send data at the same time, and the base station reduces the interference received by the center users of this cell by controlling the power of the center users of adjacent c...

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Abstract

The invention discloses a transmission method with channel estimation and power control combined based on a user arrival direction. Firstly, users in each cell are divided into cell center users or cell edge users; in view of arrival directions of the cell edge users arriving at each base station antenna, secondary grouping is carried out on all cell edge users, users of different users are equipped with pilot occupancy resources, and the base station estimates channel information according to received pilot signals; and finally, through enabling the base station to control the power of center users in an adjacent cell, interference on the center users in the cell is reduced. The method of the invention can use angle domain information to save pilot overhead, pilot pollution to the cell edge users can be effectively lessened, the channel estimation errors are reduced, the performance of the center users in the cell is improved through controlling user transmitting power, and the whole transmission rate of the system is greatly improved.

Description

technical field [0001] The invention belongs to the field of channel estimation and data transmission in a large-scale multiple-input multiple-output (MIMO) system in a multi-cell environment, and relates to a transmission method combining channel estimation and power control based on user arrival angles. Background technique [0002] In a large-scale multiple-input multiple-output (MIMO) system in a multi-cell environment, the channel is estimated by sending pilot signals. Since the number of antennas at the base station is far greater than the number of users, the massive MIMO system generally uses a time division duplex (TDD) mechanism. , the channel is estimated by the user sending a pilot signal. Due to the limited dimension of the pilot sequence, users in different cells will use non-orthogonal pilot sequences, or multiplex the same pilot sequence. Therefore, the pilot signal received by the base station of a specific cell will be affected by other cell The interferen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/04H04L25/02H04L5/00
CPCH04B7/0413H04B7/0426H04B7/0495H04L5/0048H04L25/0202
Inventor 许威刘明霞
Owner 白盒子(上海)微电子科技有限公司
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