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Mobile communication system, base station, and interference removal method

A mobile communication system and base station technology, which is applied in the field of mobile communication systems, can solve problems such as the inability to eliminate interference signals, and achieve the effect of avoiding the increase in size

Inactive Publication Date: 2014-03-05
NEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, the above-mentioned interference cancellation technique has the problem that if there is an interfering signal in the same direction as the desired signal, the interfering signal cannot be eliminated because the null cannot be formed in the direction of the interfering signal.

Method used

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  • Mobile communication system, base station, and interference removal method
  • Mobile communication system, base station, and interference removal method
  • Mobile communication system, base station, and interference removal method

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Embodiment Construction

[0022] Now, the best mode for carrying out the invention will be described with reference to the accompanying drawings.

[0023] figure 1 is a diagram showing the overall configuration of a mobile communication system of an exemplary embodiment of the present invention.

[0024] like figure 1 As shown, the mobile communication system of this exemplary embodiment includes a base station (BS: Base Station, base station) 10, and n (n is a natural number equal to or greater than 2) mobile terminals (MS: Mobile Station, mobile terminal) 20- 1~20-n.

[0025] The antenna 11 of the base station 10 is composed of n pairs of antenna elements 11x and 11y having polarizations perpendicular to each other, each pair being used for one of the mobile terminals 20-1 to 20-n.

[0026] Each antenna 21 of the mobile terminals 20-1~20-n is constituted by one antenna element having a vertical polarization characteristic.

[0027] Mobile communication is basically realized by trans-horizon commu...

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Abstract

A base station of the present invention includes: first and second antenna elements that have polarization characteristics orthogonal to each other; a first converter that converts a received signal of the first antenna element into a baseband signal; a first multiplier that weights the baseband signal converted by the first converter by multiplying a first weight coefficient; a second converter that converts a received signal of the second antenna element into a baseband signal; a second multiplier that weights the baseband signal converted by the second converter by multiplying a second weight coefficient; an adder that adds the baseband signals weighted by the first and second multipliers and outputs the sum; and, a signal processor that calculates the first and second coefficients by MMSE such that the combined polarization of the received signals of the first and second antenna elements will be orthogonal to the polarization of an interference signal.

Description

technical field [0001] The invention relates to a mobile communication system, a base station and an interference elimination method. Background technique [0002] In a mobile communication system, multiple mobile terminals can use the same frequency for radio communication with a base station. [0003] When a base station performs radio communication with a specific mobile terminal, if a reception signal (desired signal) received from the mobile terminal is interfered with by a reception signal (interfering signal) received from another mobile terminal, the reception effect deteriorates. [0004] As an example of an interference canceling technique for canceling such an interfering signal, there is a technique in which an antenna is composed of a plurality of antenna elements so that received signals at the respective antenna elements are antenna-combined to obtain Antenna directivity is controlled (see Patent Document 1). According to this, the antenna directivity is con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/10H04J11/00H04W16/28
CPCH01Q21/245H04W88/08H01Q1/246H04B7/0854H04W28/04H04B7/10
Inventor 平部正司
Owner NEC CORP