Intensive small cellular network user grouping and self-adaptive interference suppression method

Abstract

The invention discloses an intensive small cellular network user grouping and self-adaptive interference suppression method. The intensive small cellular network user grouping and self-adaptive interference suppression method comprises the steps that: firstly, a central processing unit groups users by utilizing large-scale fading channel information of each user, the users in the same group use the same pilot frequency, and the users of different groups use different orthogonal pilot frequencies; secondly, each small cellular base station determines adjacent intergroup interference users by utilizing the large-scale fading channel information of the users, and estimates channel vectors of the adjacent users by utilizing received uplink pilot frequency; if intergroup interference users do not exist, an uplink can adopt maximum ratio combination (MRC) reception and a downlink can adopt maximum ratio transmission (MRT) precoding; and if the intergroup interference users exist, the uplink can adopt zero-forcing reception and the downlink can adopt zero-forcing precoding transmission, so as to eliminate intergroup interference. The intensive small cellular network user grouping and self-adaptive interference suppression method can reduce pilot frequency pollution and reduce system pilot frequency overhead by adopting the simple user grouping method; moreover, the small cellular base stations eliminate the intergroup interference in a self-adaptive manner, and can effectively improve the spectral efficiency of the system.

Description

technical field [0001] The invention relates to a dense small cellular network wireless communication technology, in particular to a method for suppressing user grouping and intergroup interference based on pilot frequency multiplexing. Background technique [0002] Dense small cell network is considered to be an effective technology to greatly improve the spectrum efficiency and power efficiency of the system. Compared with the traditional cellular network, the dense small cell network can greatly shorten the access distance between the user terminal and the sending node by densely deploying low-cost, low-power small cell base stations, thereby obtaining low propagation loss and high spatial multiplexing gain . Due to the densification of the network, the dense small cell network can allow more users to be served simultaneously in the same frequency band. However, the available orthogonal pilot resources are limited. As the number of users increases, dense small cell netw...

AI Technical Summary

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

Images