User Grouping and Adaptive Interference Suppression Method in Dense Small Cell Networks
A network user and interference suppression technology, applied in network planning, multiplexing communication, orthogonal multiplexing system, etc., can solve the problem that the channel information overhead is unbearable for the actual system, there is no dense small cell network, and co-channel interference And other issues
Active Publication Date: 2018-06-22
NANTONG RES INST FOR ADVANCED COMM TECH CO LTD
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Problems solved by technology
[0003] Scholars have carried out in-depth research on how to suppress pilot pollution in large-scale antenna systems, but there is no such research in dense small cell networks
On the other hand, the implementation of a dense small cell network can cause severe co-channel interference, especially in areas of overlapping coverage between different small cells
The joint processing method that needs to share the global channel state information is usually used to solve the problem of co-channel interference, but the channel information overhead required for joint processing is unbearable for practical systems
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[0049] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.
[0050] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
[0051] The dense small cell network system model of this embodiment is as follows figure 1 As shown, considering the time division duplex (TDD) transmission method, it is assumed that a cell has N small cells, each small cell is equipped with a small cell base station equipped with M antennas, and is connected to the central processing unit through a backhaul link with limited capacity . The number of users served by the same frequency band in the whole cell is K, and each user is configured with a single antenna and is served by a small cell base station. User pilot transmit power is ρ p , the coverage radius ...
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The invention discloses a method for user grouping and adaptive interference suppression in a dense small cell network. Firstly, the central processing unit uses the large-scale fading channel information of each user to group users. The same group of users uses the same pilot frequency, and different groups of users use different pilot frequencies. Orthogonal pilot. Next, each small cell base station uses the user's large-scale fading channel information to determine adjacent inter-group interference users, and uses the received uplink pilot to estimate the channel vector of adjacent users. If there is no inter-group interference user, the uplink and downlink can use Maximum ratio combining (MRC) reception and maximum ratio transmission (MRT) precoding; if there are intergroup interference users, the uplink and downlink can respectively use zero-forcing reception and zero-forcing precoding transmission to eliminate intergroup interference. The invention can reduce pilot frequency pollution through a simple user grouping method, and at the same time reduce system pilot frequency overhead; in addition, each small cellular base station can self-adaptively eliminate intergroup interference, and can effectively improve system spectrum efficiency.
Description
technical field [0001] The present invention relates to a dense small cell network wireless communication technology, in particular to a method for suppressing user grouping and inter-group interference based on pilot frequency reuse. Background technique [0002] Dense small cell networks are considered to be an effective technique to greatly improve the spectral efficiency and power efficiency of the system. Compared with traditional cellular networks, dense small cell networks can greatly shorten the access distance between user terminals and sending nodes by densely deploying low-cost, low-power small cell base stations, thereby achieving low propagation loss and high spatial multiplexing gain. . Due to the densification of the network, dense small cell networks can allow more users to be served simultaneously in the same frequency band. However, the available orthogonal pilot resources are limited. With the increase of the number of users, the dense small cell network...
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IPC IPC(8): H04J11/00H04W16/10H04W72/04
CPCH04J11/0026H04J11/0059H04W16/10H04W72/51
Inventor 孙强李宇晖徐晨包志华王珏任春莉
Owner NANTONG RES INST FOR ADVANCED COMM TECH CO LTD