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Same-channel interference cancellation method, device and system

A technology of interference cancellation and co-channel interference, applied in transmission systems, baseband system components, radio transmission systems, etc., and can solve problems such as the complexity of XPIC systems

Active Publication Date: 2017-04-12
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the process of realizing the above-mentioned interference cancellation technology, the inventors found at least the following problems in the prior art: In an XPIC system formed by two ODUs with different polarization directions, each ODU requires at least two interference cancellation links , so the established XPIC system is more complex

Method used

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  • Same-channel interference cancellation method, device and system
  • Same-channel interference cancellation method, device and system
  • Same-channel interference cancellation method, device and system

Examples

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Embodiment 1

[0119] Figure 2A It is a schematic diagram of a co-channel interference cancellation system provided by Embodiment 1 of the present invention. Such as Figure 2A As shown, the system includes: a transmitting polarization combiner 21, which is used to combine the V-polarized signal and the H-polarized signal into a transmitting signal; To transmit the transmitted signal combined by the transmitting polarization combiner 21; the local dual-polarized receiving antenna 23 (which can be referred to as the receiving antenna 23 for short) interfered by the transmitting signal of the transmitting antenna 22; the receiving polarization combiner 24 , for splitting the signal received by the receiving antenna 23 into a V-polarized signal and an H-polarized signal; and a co-channel interference canceling device 30 .

[0120] Wherein, the reference signal input terminal of the same-channel interference canceling device 30, that is, the first coupler (see the following embodiments) is co...

Embodiment 2

[0125] Figure 2B It is a schematic diagram of the same-channel interference cancellation system provided by Embodiment 2 of the present invention. Such as Figure 2B As shown, on the basis of the first embodiment, the system further includes an indoor unit IDU25 and an outdoor unit ODU; the IDU25 is respectively connected to the ODU_V261 in the V polarization direction and the ODU_H262 in the H polarization direction.

[0126] At the transmitting end of the local end, the transmitting polarization combiner 21 is connected to ODU_V261 and ODU_H262 respectively. The V polarization signal is generated from the IDU25, and is input to the emission polarization combiner 21 through the ODU_V261; the H polarization signal is generated from the IDU25, and is input to the emission polarization combiner 21 through the ODU_H262. The V-polarized signal and the H-polarized signal are combined at the transmitting polarization combiner 21 to form a transmitting signal, which is a dual-pola...

Embodiment 3

[0133] image 3 It is a schematic structural diagram of an apparatus for canceling co-channel interference provided by Embodiment 3 of the present invention. Such as image 3 As shown, the same-channel interference canceling device 30 is used to cancel the interference signal formed by the transmitting end of the local end to the receiving end of the local end. As mentioned above, the interference signal includes the first interference signal received by the V-polarized receiving antenna and the second interference signal received by the H-polarized receiving antenna. Device 30 includes:

[0134] The first coupler 31 is configured to couple and acquire a first reference signal and a second reference signal from a transmission signal transmitted on the same transmission link at the transmission end of the local end, where the transmission signal includes a V polarization signal and an H polarization signal;

[0135] The signal recombiner 32 is configured to perform signal re...

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Abstract

The invention provides a same-frequency interference cancellation method, device and system, which relate to the field of wireless and microwave communication and can simplify the XPIC system. The method is used to offset the interference signal formed by the transmitting terminal of the local terminal to the receiving terminal of the local terminal, including: coupling the transmitting signal transmitted on the same transmitting link of the transmitting terminal to obtain the first reference signal and the second reference signal, and the transmitting signal includes a V pole polarization signal and H polarization signal; signal recombination according to the first reference signal and the second reference signal to obtain the first interference cancellation signal and the second interference cancellation signal; let the first interference cancellation signal pass through the analog interference channel, and make the first interference cancellation signal The second interference cancellation signal passes through the analog interference channel; the first interference cancellation signal and the second interference cancellation signal passing through the analog interference channel are coupled and output to the same receiving link of the receiving end of the local end, and combined with the signal received by the receiving end of the local end . The invention is used for the same-frequency interference cancellation technology.

Description

technical field [0001] The present invention relates to the field of wireless and microwave communication, in particular to a method, device and system for co-channel interference cancellation. Background technique [0002] Interference is a key technical problem that wireless and microwave communication equipment needs to solve. One of the main interferences of wireless and microwave communication equipment comes from the coupling from the local transmitting antenna to the local receiving antenna. In order to solve the interference caused by the coupling, the interference cancellation technology can be used: the transmission signal is obtained by coupling from the transmitting end of the local end, makes it pass through the simulated interference channel, and adjusts its phase to an odd number with a phase difference of 180° from the interference signal times, and then coupled to the receiving end of the end, so as to achieve the cancellation of interference signals. [0...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/03H04L25/08
CPCH04L25/08H04B1/0064H04J11/0036H04B1/525H04L25/03H04B1/0475H04B7/0469H04L5/0048H04L5/04
Inventor 刘余洪成蔡梦蒋红丽
Owner HUAWEI TECH CO LTD