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Method and device for eliminating same-frequency and adjacent-frequency interference in analog domain

An adjacent frequency interference and interference elimination technology, applied in the direction of echo reduction, transmission system, electrical components, etc., can solve the problems of amplitude compression, signal noise floor increase, application limitation, etc., to improve the effect, reduce noise floor increase, interference Scope widening effect

Active Publication Date: 2021-06-25
ANYWAVE COMM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These operations will cause the noise floor of the signal to rise, the quality to be damaged, and the amplitude to be compressed due to the influence of the device's own dynamic range and indicators, thereby affecting the performance of echo cancellation; and the reference signal used by this technology to generate echo signals is The digital signal in the digital signal processing module, the signal has not gone through the steps of digital-to-analog conversion, up-conversion, power amplifier and antenna output in the up-conversion link in the actual transmission, and the return in the mixed signal received by the actual receiving antenna wave, there will be differences in delay, phase and amplitude, and it is not an ideal reference signal
Moreover, this technology does not compensate for differences in delay, phase, and amplitude.
As a result, when the transmission chain is very long, the delay, phase and amplitude differ greatly, which may exceed the range that echo cancellation can handle, so that echo cannot be eliminated at all; most importantly, this technology can only Dealing with the echo from itself, that is, the interference of known signals, there is no way to deal with the interference of other non-self-transmitted and unknown signals, such as other same-frequency or adjacent-frequency transmission signals from the same transmission point. Interference, compared to the present invention, the application is greatly limited

Method used

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  • Method and device for eliminating same-frequency and adjacent-frequency interference in analog domain
  • Method and device for eliminating same-frequency and adjacent-frequency interference in analog domain
  • Method and device for eliminating same-frequency and adjacent-frequency interference in analog domain

Examples

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Embodiment 1

[0035] Such as figure 1 As shown, this embodiment relates to the same-channel interference cancellation applied to the same-frequency repeater system.

[0036] The same-frequency repeater is used to amplify the useful signal received by the receiving antenna from the distant main tower and retransmit it to improve local area coverage. Usually, the receiving antenna of the co-frequency repeater will receive the interference of the co-frequency signal sent by its own transmitting antenna at the same time as receiving the effective signal, which is called echo, and the echo signal is often larger than the received main frequency signal. The signal is much stronger and therefore belongs to the interference signal described in the present invention.

[0037] For example, in this embodiment, the frequency of the repeater station is channel 25, which is set up on a hillside, and is more than 80 kilometers away from the main TV signal transmission tower that is also channel 25, and b...

Embodiment 2

[0047] Such as image 3 As shown, this embodiment involves adjacent channel interference cancellation: the main transmitting device with a receiving antenna is simultaneously interfered by broadcast signals of nearby upper and lower adjacent channels.

[0048]In this embodiment, the main transmitting device has a main receiving antenna and a main transmitting antenna, and the transmitting power is only 10w (40dbm). Because the signals sent and received are not on the same frequency point and are far apart, there is no need to deal with the same-channel interference caused by its own transmitting antenna. However, on the same transmitting tower as the main device, there is also a transmitting antenna working on the broadcast signal of its upper and lower adjacent frequencies, and it is an omnidirectional antenna with a relatively large transmitting power (2kw, corresponding to 63dbm), so even after the bandpass of the transmitter Filter, a single transmitter still reaches 27db...

Embodiment 3

[0064] Such as Figure 4 As shown, this embodiment is applied to the situation where the same-frequency repeater system suffers from both the same-frequency interference and the upper-lower-adjacent-frequency interference.

[0065] In this embodiment, the interference signal includes not only the same-frequency echo signal from the transmit antenna of the repeater itself, which is 35dB higher than the main signal, but also the echo signal from the same transmission tower working at the upper and lower adjacent frequencies. 30dBm adjacent frequency interference generated by broadcast signal omnidirectional antenna. If the analog domain interference elimination method described in the present invention is not used, it will not work normally.

[0066] For the co-channel interference in this embodiment, the interference signal source comes from the echo generated by the signal transmitted by itself, which is a known signal, so it can be directly connected through the feeder line,...

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Abstract

A method and device for eliminating same-frequency and adjacent-frequency interference in the analog domain, in the case of on-site detection and judgment of the existing same-frequency and / or adjacent-frequency interference signal source in a wireless communication device with a receiving antenna, that is, the transmitting point of the main device , collect the same-frequency and / or adjacent-frequency reference signals from the interference signal source by directly connecting the feeder or adding an antenna, and obtain the same-frequency and / or adjacent-frequency interference analog signals after the interference signal recovery processing, and then directly in the analog domain The same-frequency and / or adjacent-frequency interference analog signals are subtracted from the received signal received by the receiving antenna of the master device to complete the analog interference elimination processing, so as to obtain an interference-eliminated radio frequency analog signal. The present invention introduces the same frequency and / or adjacent frequency as a reference signal in the analog domain to restore the interference signal and eliminates it in the radio frequency analog domain, thereby improving the signal quality received by the receiving antenna.

Description

technical field [0001] The present invention relates to a technology in the field of wireless communication, in particular to a method and device for eliminating same-frequency and adjacent-frequency interference in an analog domain. Background technique [0002] Now that spectrum resources are increasingly scarce, the existing spectrum is expected to be fully utilized as much as possible, and more than one transmitting device of different channels is often installed on the existing signal tower. Therefore, in practical applications, it is not uncommon for a device to be interfered by the signal of its own channel (such as channel N) and / or its adjacent channels (such as upper and lower adjacent channels, N±1). Especially when the device has a receiving antenna, while its receiving antenna collects useful signals, it is also very likely to collect the same-frequency signal transmitted by itself or the interference signal of the adjacent frequency of the adjacent transmitting...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/10H04B7/015
CPCH04B1/1027H04B7/015H04B1/1036
Inventor 夏劲松李文华宋伯炜范莹莹
Owner ANYWAVE COMM TECH