Uplink interference restraining method of cellular system based on antenna synergism

Abstract

An up link interference restraining method of a cellular system based on antenna synergism relates to the field of mobile communication. In order to eliminate strong interference in a side lobe or back lobe direction of a directional antenna in the cellular system, the method realizes interference restraint for an uplink of the cellular system. An omnidirectional antenna access is leaded in a receiver on the base station side of the cellular system; lower frequency conversion, analog-digital conversion and a filtering unit of the omnidirectional antenna access are accordant with a directional antenna access, but gains of the access can be adjusted as required, and Gback / Gomni gain processing is performed on signals. In addition, a signal delay adjusting unit is leaded in the system to perform delay adjustment on two ways of signals, so as to ensure that time sequences of the two ways of interference signals are consistent in a subtracting operation. Gain adjusting values and delay adjusting values of the interference signals are given through a back-end synchronous judging unit by adopting a three-dimensional searching method which is based on MMSE (Minimum Mean Square Error). The method is suitable for the uplink interference restraint of the cellular system.

Description

technical field [0001] The invention relates to the field of mobile communication, in particular to a method for suppressing uplink interference of a cellular system. Background technique [0002] There are many types of interference in cellular wireless communication systems, including co-channel interference, inter-cell interference, intra-cell interference, multi-user interference, and heterogeneous network interference. At present, there are many methods to solve these interferences, such as beam forming, interference randomization, interference cancellation, interference coordination and so on. Among them, the interference cancellation technology is mainly based on interference reconstruction / subtraction. After demodulating / decoding the interference signal, the interference signal is reconstructed, and then subtracted from the received signal. This is the most ideal method for interference elimination, but it requires the system to put forward higher requirements or mo...

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Problems solved by technology

This is the most ideal method for interference elimination, but it requires the system to put forward higher requirements or more restrictions on resource allocation, signal form acquisition, inter-cell synchronization, interleaver design, channel estimation, etc., so it is not practical at present

[0003] And when the link between the terminal and the base station is poor, the uplink signal of a certain terminal arriving at the base station will be very weak

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