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Densely-distributed wireless network dynamic pilot multiplexing channel estimation and pilot frequency distribution method

A pilot allocation and channel estimation technology, applied in channel estimation, sustainable building, transmission system, etc., can solve the problems of pilot pollution, pollution, coherence time length cannot support a large number of users to use orthogonal pilots, etc., to achieve High allocation efficiency, reduced pilot overhead, and the effect of solving the acquisition bottleneck problem

Active Publication Date: 2014-03-12
HUAWEI TECH CO LTD
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Problems solved by technology

However, the coherence time length of the channel usually cannot support a large number of users using orthogonal pilots
In order to reduce pilot overhead, it is necessary to rely on pilot multiplexing channel estimation method to support more users, but non-orthogonal training sequences sent by users will cause the uplink channel estimation at the base station to be polluted by training sequences sent by other users, which will lead to to pilot pollution problem
Pilot pollution is one of the bottlenecks restricting the performance of dense distributed wireless communication systems

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  • Densely-distributed wireless network dynamic pilot multiplexing channel estimation and pilot frequency distribution method

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[0022] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0023] 1. System configuration and communication process

[0024] figure 1 Schematic diagram of deploying remote access units for a densely distributed wireless network. In the figure, the application scenario of a single cell is considered, and the transmission mode of time division duplex (TDD) is considered. The number of distributed ...

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Abstract

The invention provides a densely-distributed wireless network dynamic pilot multiplexing channel estimation and pilot frequency distribution method. The method includes that RAUs (remote access units) are densely distributed in a small cell and connected through a high-speed backhaul link and a central processing unit, and multiple users perform wireless communication with the neighboring RAUs on a same time-frequency resource; under the situation that pilot resources are limited, pilot frequency is multiplexed on the same time-frequency resource according to large-scale fading channel information of users, and the dynamic multiplexing channel estimation is implemented according to variation of system parameters; the central processing unit distributes pilot frequency information for dispatching users by the aid of the acquired large-scale fading channel information; the dispatching users transmit pilot frequency information dispatched thereto, the RAUs estimate channel parameters and counts channel estimation errors according to different pilot frequency multiplexing factors and finally design an uplink receiver and downlink transmission precoding. The densely-distributed wireless network dynamic multiplexing channel estimation and pilot frequency distribution method has the advantages that the densely-distributed wireless network is high in spectrum effectiveness, high in power efficiency and low in required pilot frequency cost.

Description

technical field [0001] The invention relates to a multi-antenna wireless communication channel estimation and pilot allocation method, in particular to a dense distributed wireless network dynamic pilot multiplexing channel estimation and pilot allocation method. Background technique [0002] In order to meet the needs of future mobile communication applications, densely deploying antenna arrays at the base station to deeply mine and utilize spatial dimension resources has become one of the development trends of future wireless communication. In the densely distributed wireless communication system, the antenna arrays densely deployed at the base station are distributed to densely deploy remote access units (RAUs) in the community, and each RAU is connected to the central processing unit through optical fibers or high-speed links. By densely deploying RAUs in the cell, the access distance between the user and the antenna can be further shortened, so as to obtain the advantag...

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Application Information

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IPC IPC(8): H04L25/02
CPCY02B60/50H04L25/0202H04L25/0226
Inventor 高西奇孙强孙晓宇金石张源
Owner HUAWEI TECH CO LTD
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