KR101924229B1 - multiple intermodulation canceling device and its method - Google Patents

Abstract

The present invention relates to an apparatus and a method for canceling multiple intermodulations which improve the receiving quality for a receiving signal by canceling an intermodulation signal generated in a receiving range by a plurality of transmitting signals and canceling the interference of the receiving range by the plurality of transmitting signals. The apparatus for canceling multiple intermodulations comprises: a first transmitting unit for transmitting a first signal; a second transmitting unit for transmitting a second signal; a receiving unit for removing an intermodulation signal operated by the interference of the receiving range by the first and second transmitting units; and a coupling unit for coupling the first transmitting unit, the second transmitting unit, and the receiving unit.

Description

[0001] DESCRIPTION [0002] Multiple intermodulation canceling devices and their methods [

The present invention relates to an apparatus and method for removing a plurality of intermodulation moduli, and specifically to eliminating the influence of an intermodulation signal of a transmission signal on a reception signal. That is, the present invention relates to a plurality of intermodulation canceling apparatus and method capable of predicting an intermodulation signal of a reception signal band from a transmission signal and removing the intermodulation signal from a reception signal.

Increasing service capacity and minimizing installation cost are major issues for mobile communication development. In order to increase the service and minimize the installation cost, it is a reality that the transmission power is increased or the integrated power is increased by transmitting to the broadband.

At this time, due to power overload, mutual modulation is occurring in passive elements such as antenna, coupler, connector, and cable.

In addition, the influence of a plurality of wireless communications such as WCDMA (Wideband Code Division Multiple Access), WiBro (Wireless Broadband) and the like is increased with one antenna.

Passive Intermodulation Distortion (PIMD) is an interference phenomenon that causes undesired parasitic signals due to interference between frequencies in a transmission signal. Unlike AIMD (Active Intermodulation Distortion) generated in active devices, And the level is also very difficult to predict, and efforts have been made to eliminate such intermodulation signals.

For example, Korean Patent Laid-Open Publication No. 10-2012-0021584 discloses a method of eliminating a passive intermodulation signal by soldering using a bonding material to a connector of a router and a connection point of a feeder line.

However, even in this case, the influence on the received signal can not be eliminated.

Korean Patent Laid-Open Publication No. 10-2012-0021584 (March 23, 2012)

An object of the present invention is to provide a multiple intermodulation elimination apparatus and method for removing an intermodulation signal generated in a reception band by a plurality of transmission signals from a reception signal.

It is another object of the present invention to provide a plurality of intermodulation canceling apparatuses and methods for eliminating interference of a reception band by a plurality of transmission signals to improve reception quality with respect to a reception signal.

A plurality of intermodulation rejection apparatuses according to the present invention include a first transmitter for transmitting a first signal, a second transmitter for transmitting a second signal, an intermodulation signal serving as interference in a reception band due to a first transmitter and a second transmitter, And a coupling unit for coupling the first transmitter, the second transmitter, and the receiver.

Here, the receiver may remove the intermodulation signal generated by the first transmitter and the second transmitter.

The receiving unit may remove the intermodulation signal generated at the combining unit with respect to the outputs of the first transmitting unit and the second transmitting unit.

Here, the coupling portion may be composed of at least one of a combiner, a filter, a switch, an antenna, a connector, and a cable.

The receiving unit may further include an intermodulation generator for generating an intermodulation signal and an intermodulation eliminator for eliminating the intermodulation signal.

Here, the intermodulation generator may include a transmission power detection module for detecting transmission power of the first transmission unit and a second transmission unit, and a reception band intermodulation generation module for generating an intermodulation signal for the reception band.

The intermodulation generator includes a transmission band intermodulation detection module for detecting an intermodulation signal of a transmission band by receiving a transmission signal of the first transmission unit and the second transmission unit and an output signal of the combining unit, And a receiving band intermodulation generation module for generating an intermodulation signal with respect to the received signal.

Here, the intermodulation generator may generate at least one of intermodulation of the output signal of the first transmitter, intermodulation of the output signal of the second transmitter, and intermodulation by combining the first transmitter and the second transmitter .

The intermodulation by the combination of the first transmitter and the second transmitter is an intermodulation of combinations that can occur in the reception band based on the frequency and the frequency bandwidth of the first transmitter and the frequency and the frequency bandwidth of the first transmitter. .

Here, the intermodulation generator performs undermodulation of intermodulation, and can eliminate interference (underlining) of undersampling.

The intermodulation eliminator may include a reception band intermodulation rejection module for removing the intermodulation signal of the reception band from the reception signal of the coupling section and a low noise amplification module for performing low noise amplification on the output of the reception band intermodulation removal module .

Here, the intermodulation eliminator may include a low-noise amplification module for performing low-noise amplification from the reception signal of the coupling part and a reception band intermodulation rejection module for removing the intermodulation signal of the reception band to the output of the low-noise amplification module.

Further, the intermodulation eliminator can remove the intermodulation signal asynchronously using an equalizer.

A plurality of intermodulation removal methods according to another embodiment of the present invention includes a first transmission step of transmitting a first signal at a first transmission unit, a second transmission step of transmitting a second signal at a second transmission unit, And a receiving step of removing an intermodulation signal serving as an interference to a reception band of the reception unit due to the output of the first transmission unit and the second transmission unit.

Here, the receiving step may include an intermodulation generating step of generating an intermodulation signal in the intermodulation generator, and an intermodulation removing step of removing the intermodulation signal in the intermodulation eliminator.

The apparatus and method for removing a plurality of intermodulation modulators according to the present invention are advantageous in that an intermodulation signal generated in a reception band by a plurality of transmission signals is removed from a reception signal.

In addition, the apparatus and method for removing a plurality of intermodulation modulators according to the present invention have an advantage of improving reception quality with respect to a received signal by eliminating interference of a reception band due to a plurality of transmission signals.

FIG. 1 is a block diagram of a multiple intermodulation rejection apparatus according to an embodiment of the present invention.
FIG. 2 is a waveform diagram illustrating an input of a receiver in the absence of an interference signal in the receiver of FIG. 1. FIG.
3 is a waveform diagram illustrating an input of a receiving unit in the case where an interference signal is present in the receiving unit of FIG.
FIG. 4 is a block diagram showing the receiver of FIG. 1 in detail.
FIG. 5 is a block diagram showing the intermodulation generator of FIG. 4 in detail.
FIG. 6 is another configuration diagram showing the intermodulation generator of FIG. 4 in detail.
FIG. 7 is a block diagram showing the intermodulation eliminator of FIG. 4 in detail.
FIG. 8 is another configuration diagram showing the intermodulation eliminator of FIG. 4 in detail.
9 is a flowchart illustrating a plurality of intermodulation cancellation methods according to an embodiment of the present invention.
10 is a detailed flowchart of the receiving step of FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It is to be understood that the present invention is not intended to be limited to the specific embodiments but includes all changes, equivalents, and alternatives included in the spirit and scope of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a plurality of intermodulation removal apparatuses and methods according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a configuration diagram of a plurality of intermodulation rejection apparatuses according to an embodiment of the present invention, and FIGS. 2 to 8 are detailed waveforms and configuration diagrams for explaining FIG. 1 in detail.

Hereinafter, a plurality of intermodulation rejection apparatuses according to an embodiment of the present invention can be described with reference to FIGS. 1 to 8. FIG.

Referring to FIG. 1, a plurality of intermodulation rejection apparatuses according to an embodiment of the present invention includes a first transmitter 110 for transmitting a first signal, a second transmitter 120 for transmitting a second signal, A receiving unit 300 for eliminating an intermodulation signal serving as an interference to a receiving band due to the transmitting unit 110 and the second transmitting unit 120 and a receiving unit 300 for receiving the intermodulation signal acting as an interference to the receiving band by using the first transmitting unit 110, the second transmitting unit 120, (Not shown).

Here, the receiving unit 300 may remove the intermodulation signals generated by the first transmitting unit 110 and the second transmitting unit 120.

The receiving unit 300 may remove an intermodulation signal generated in the combining unit 200 with respect to outputs of the first transmitting unit 110 and the second transmitting unit 120. [

Here, the coupling unit 200 may be composed of a combiner, a filter, a switch, an antenna, a connector, and a cable.

The intermodulation may include active intermodulation occurring in the active elements in the first transmitter 110 and the second transmitter 120 and passive intermodulation occurring in the passive elements in the combiner 200. [

Interference that affects the received signal may be active intermodulation and passive intermodulation.

In this case, the intermodulation occurs as a result of intermodulation between frequencies in the transmission signal, which can be divided into odd-order and even-order. In the case of the even order, the influence affects the transmission frequency N times. There are characteristics.

In addition, low-order intermodulation affects the transmission frequency, such as third order and fifth order. However, high-order intermodulation can have an effect if the distance from the transmission frequency is small.

On the other hand, when a plurality of transmission frequencies coexist, it is necessary to consider all the cases of the N-order of the intermodulation when the plurality of combinations become the N-order, and therefore, a very complicated signal processing is required and a broadband and super high-speed signal processing is required.

The intermodulation becomes larger as the size of the transmission signal becomes larger, and may affect the reception signal band.

2 to 3 are waveforms showing the influence of interference on a received signal band according to a transmission signal size.

2 is a waveform showing the input of the receiving unit 300 when there is no interference signal in the receiving unit 300 of FIG. 2, when the outputs of the first transmission signal 410 and the second transmission signal 420 are low, the first transmission signal 410 and the second transmission signal 420 cause the intermodulation signal size The received signal 500 is not affected.

On the other hand, when the outputs of the first transmission signal 410 and the second transmission signal 420 are high, the size of the modulated signal is large due to the first transmission signal 410 and the second transmission signal 420, Lt; RTI ID = 0.0 > 500. ≪ / RTI >

FIG. 3 is a waveform showing the input of the receiver 300 when there is an interference signal in the receiver 300 of FIG. 3, when the outputs of the first interference signal 610 and the second interference signal 620 are high, the first transmission unit 110 and the second transmission unit 120 or the coupling unit 200 mutually Modulation may occur and may affect the received signal 500. At this time, since the received signal is added to the intermodulation signal 700 and the received signal 800 after intermodulation cancellation, it can be seen that the interference effect is large.

The intermodulation signal 700 may be an active intermodulation generated by the first transmitter 110 and the second transmitter 120 or may be a passive intermodulation generated by the combiner 200, And may include both intermodulation signals.

Therefore, the reception performance can be improved by removing the intermodulation signal 700 and extracting the reception signal 800 after intermodulation cancellation.

FIG. 4 is a detailed diagram of the receiving unit 300 of FIG.

As shown in FIG. 4, the receiving unit 300 may include an intermodulation generator 310 for generating an intermodulation signal and an intermodulation eliminator 320 for removing the intermodulation signal.

The intermodulation generator 310 may include an intermodulation unit 310 for intermodulating an output signal of the first transmission unit 110, intermodulation of an output signal of the second transmission unit 120, and an intermodulation of the output signals of the first transmission unit 110 and the second transmission unit 120 ) By intermodulation.

The intermodulation by the combination of the first transmitter 110 and the second transmitter 120 may be performed in the reception band on the basis of the frequency and frequency bandwidth of the first transmitter 110 and the frequency and frequency bandwidth of the first transmitter 110, And may be characterized by intermodulation of a combination that can occur.

Here, the intermodulation generator 310 performs undermodulation for intermodulation, and can eliminate interference (underlining) of undersampling.

In addition, the intermodulation eliminator 320 may asynchronously remove the intermodulation signal using an equalizer.

Here, the intermodulation generator 310 may generate an intermodulation signal that affects the receiving band through the intermodulation model from the first interfering signal 610 and the second interfering signal 620.

At this time, when the frequency difference between the transmission band and the reception band is large, the degree of the intermodulation model increases, and high-speed signal processing is required to process the signal.

Also, the combination of the output signal of the first transmission unit 110 and the output signal of the second transmission unit 120 may affect the reception band.

In this case, when the output signal of the first transmitting unit 110 is A and the output signal of the second transmitting unit 120 is B, in the case of intermodulation of N-th order, the (NM) And M is an integer equal to or greater than 0 and equal to or less than N). Based on this, a combination that affects the reception band is selected in advance, thereby reducing the complexity of signal processing.

On the other hand, it is possible to carry out under-sampling less than twice the transmission frequency or the bandwidth of the transmission signal. At this time, interference due to duplicated sampling may occur.

That is, there is an effect that the signal processing can be performed at a low speed by removing the interference (alignment) according to the intermodulation order within the intermodulation model to generate the intermodulation signal in the reception band.

Meanwhile, when the transmission power is small, interference due to intermodulation does not exist. Therefore, the interference signal may not be generated. At this time, the noise generated in the intermodulation generator may affect the intermodulation canceler 320 There are advantages that do not go far.

FIG. 5 is a block diagram showing the intermodulation generator 310 of FIG. 4 in detail.

5, the intermodulation generator 310 includes a transmission power detection module 311 for detecting transmission power of the first transmission unit 110 and the second transmission unit 120, And a reception band intermodulation generation module 312 for generating a reception band modulation signal.

Here, the transmission power detection module 311 may detect the transmission power and perform the operation of the reception band intermodulation generation module 312. When the reception band intermodulation generation module 312 receives the intermodulation signal 312, .

In addition, an unmodulated down-converter, an intermodulation signal synchronizer, an intermodulation regenerator, an intermodulation covariance calculator, an intermodulation signal orthogonalizer, and an intermodulation gain controller may generate intermodulation signals.

Meanwhile, in the reception band intermodulation generation module 312, an intermodulation model may be used for generation of intermodulation in the reception band, and an intermodulation signal of N orders can be generated using Taylor series or Volterra series .

Also, the output of the Taylor series or the Boltera series can be performed so that the N inter-modulated signals are orthogonal to each other through a covariance operation.

FIG. 6 is another configuration diagram showing the intermodulation generator 310 of FIG. 4 in detail.

6, the intermodulation generator 310 receives the transmission signals of the first and second transmission units 110 and 120 and the output signal of the combining unit 200 and receives the intermodulation signal of the transmission band And a reception band intermodulation generation module 314 for generating an intermodulation signal for the reception band on the basis of the intermodulation signal of the transmission band.

Here, the transmission band mutual modulation detection module 313 is a module configured to detect a magnitude of the intermodulation generated in the coupling unit 200 by the signals transmitted from the first transmission unit 110 and the second transmission unit 120 .

At this time, the transmission band mutual modulation detection module 313 extracts the difference between the signal in the transmission band received by the combining unit 200 and the transmission signal of the first transmitter 110 and the second transmitter 120, The modulation signal can be extracted.

Further, it is possible to compensate the intermodulation model from the characteristics of the intermodulation signal in the transmission signal band.

That is, the model accuracy of the intermodulation characteristic in the first transmitter 110, the second transmitter 120, and the coupling unit 200 is compensated by compensating the magnitude, phase, and delay of the order of the Taylor series or Boltera series. Can be increased.

Meanwhile, in the reception band intermodulation generation module 314, an intermodulation model can be used for generation of intermodulation in the reception band as in the reception band intermodulation generation module 312, and N Order intermodulation signal can be generated.

Also, the output of the Taylor series or the Boltera series can be performed so that the N inter-modulated signals are orthogonal to each other through a covariance operation.

FIG. 7 is a block diagram showing the intermodulation eliminator 320 of FIG. 4 in detail.

7, the intermodulation eliminator 320 includes a reception band intermodulation removal module 322 for removing the intermodulation signal of the reception band from the reception signal of the coupling unit 200, And a low noise amplification module 321 for performing low noise amplification on the output of the low pass filter 322.

The reception band intermodulation rejection module 322 performs the intermodulation elimination module 322 prior to the low noise amplification module 321 to reduce the size of the intermodulation received by the low noise amplification module 321 so that the IIMD of the low noise amplification module 321 Intermodulation Distortion).

The receiving band intermodulation rejection module 322 may subtract the output of the intermodulation generator 310 from the output of the combining unit 200 by subtraction and may be included in the output of the receiving band intermodulation rejection module 322 The output component of the intermodulation generator 310 may be minimized.

In addition, a delay may occur between the signal of the reception band intermodulation rejection module 322 and the output of the combining unit 200. Such a delay may be fixed in the system to synchronize, and an asynchronous have.

In this case, when the present invention is implemented using an equalizer, synchronization between the output of the intermodulation generator 310 and the output of the combining unit 200 is not required, and even if the configuration of the combining unit 200 is changed over time, There is an advantage to be able to do.

FIG. 8 is another configuration diagram showing the intermodulation canceler 320 of FIG. 4 in detail.

8, the intermodulation eliminator 320 receives the output of the low-noise amplification module 324 and the low-noise amplification module 324, which perform low-noise amplification from the received signal of the coupling unit 200, And a reception band intermodulation rejection module 323 for removing the intermodulation signal.

Here, the low-noise amplification module 324 is performed prior to the reception-band intermodulation removal module 323 to effectively remove the intermodulation signal of a low amplitude.

The receiving band intermodulation rejection module 322 may subtract the output of the intermodulation module 310 from the output of the combining unit 200 by subtracting the output of the receiving band intermodulation rejection module 322, It may be implemented as feedback so that the output of the modulation generator 310 is minimized.

In addition, a delay may occur between the signal of the reception band intermodulation rejection module 322 and the output of the combining unit 200. Such a delay may be fixed in the system to synchronize and be implemented asynchronously including an equalizer .

In this case, when the present invention is implemented using an equalizer, synchronization between the output of the intermodulation generator 310 and the output of the combining unit 200 is not required, and even if the configuration of the combining unit 200 is changed over time, There is an advantage to be able to do.

FIG. 9 is a flowchart illustrating a plurality of intermodulation cancellation methods according to an embodiment of the present invention, and FIG. 10 is a detailed flowchart for explaining FIG. 9 in detail.

Hereinafter, a plurality of intermodulation cancellation methods according to another embodiment of the present invention will be described with reference to FIGS.

9, a plurality of intermodulation cancellation methods according to another exemplary embodiment of the present invention includes a step S110 of transmitting a first signal in a first transmission unit 110, a step S110 of transmitting a first signal in a second transmission unit 120, A step S200 of combining the first transmission unit 110, the second transmission unit 120 and the reception unit 300 and the step S200 of connecting the first transmission unit 110 and the second transmission unit 120, And removing the intermodulation signal acting as an interference in the reception band of the receiver 300 due to the output (S300).

The transmission signals generated in the first transmission step (S110) and the second transmission step (S120) may affect the reception signal band depending on the size of the signal.

Such intermodulation includes the active intermodulation occurring in the active elements in the first transmitter 110 and the second transmitter 120 and the passive intermodulation occurring in the passive elements in the combiner 200, And the description of detailed intermodulation is omitted for the sake of brevity.

FIG. 10 is a detailed flowchart of the receiving step (S300) of FIG.

10, the receiving step S300 includes a step S310 of generating an intermodulation signal at the intermodulation generator 310 and a step S320 of removing the intermodulation signal at the intermodulation eliminator 320, .

That is, in the intermodulation generation step S310, an intermodulation signal of the reception signal band can be generated based on the transmission signal. At this time, the signal processing can be performed at a low speed by eliminating interference due to undersampling , Can occur simply by using Taylor series or Volterra series when intermodulation occurs.

Meanwhile, in the intermodulation removal step S320, the intermodulation signal generated in the intermodulation generation step S310 may be removed from the reception signal. When the intermodulation is performed using the equalizer, And it is possible to eliminate the intermodulation signal even if the configuration of the combining unit 200 changes with time.

As described above, the apparatus and method for removing a plurality of intermodulation modulators according to the present invention are advantageous in that an intermodulation signal generated in a reception band by a plurality of transmission signals is removed from a reception signal, and interference of a reception band by a plurality of transmission signals is eliminated Thereby improving the reception quality of the received signal.

What has been described above includes examples of one or more embodiments. It is, of course, not possible to describe all possible combinations of components or methods for purposes of describing the embodiments described, but one of ordinary skill in the art may recognize that many further combinations and permutations of various embodiments are possible. Accordingly, the described embodiments are intended to embrace all such alterations, modifications and variations that fall within the spirit and scope of the appended claims.

Claims (15)

A first transmitter for transmitting a first signal;
A second transmitter for transmitting a second signal;
A receiving unit for removing an intermodulation signal serving as interference in a reception band due to the first transmission unit and the second transmission unit; And
And a coupling unit coupling the first transmitter, the second transmitter, and the receiver,
The receiver may further comprise:
An intermodulation generator for generating an intermodulation signal; And
And an intermodulation eliminator for removing the intermodulation signal,
Wherein the intermodulation generator performs undermodulation of the intermodulation and removes interference of the under-sampling (aliasing). The method according to claim 1,
Wherein the receiving unit removes an intermodulation signal generated in the first transmitting unit and the second transmitting unit. The method according to claim 1,
Wherein the receiving unit removes an intermodulation signal generated in the combining unit with respect to outputs of the first transmitting unit and the second transmitting unit. The method according to claim 1,
Wherein the coupling unit is composed of at least one of a combiner, a filter, a switch, an antenna, a connector, and a cable. delete The method according to claim 1,
The intermodulation generator includes:
A transmission power detection module for detecting transmission power of the first transmission unit and the second transmission unit; And
And a reception band intermodulation generation module for generating the intermodulation signal with respect to the reception band. The method according to claim 1,
The intermodulation generator includes:
A transmission band intermodulation detection module for detecting the intermodulation signal of a transmission band by receiving a transmission signal of the first transmission unit and the second transmission unit and an output signal of the combining unit; And
And a reception band intermodulation generation module for generating the intermodulation signal for the reception band based on the intermodulation signal of the transmission band. The method according to claim 1,
Wherein the intermodulation generator includes at least one of intermodulation of the output signal of the first transmission unit, intermodulation of the output signal of the second transmission unit, and intermodulation by the combination of the first transmission unit and the second transmission unit One of the plurality of intermodulation canceling units is generated. 9. The method of claim 8,
Wherein the intermodulation by the combination of the first transmitter and the second transmitter is performed based on the frequency and frequency bandwidth of the first transmitter and the frequency and frequency bandwidth of the first transmitter, And a plurality of intermodulation canceling units. delete The method according to claim 1,
Wherein the intermodulation rejection unit comprises: a reception band intermodulation rejection module for removing the intermodulation signal of the reception band from the reception signal of the combining unit; And
And a low noise amplification module for performing low noise amplification on the output of the reception band intermodulation rejection module. The method according to claim 1,
Wherein the intermodulation rejection unit comprises: a low noise amplification module for performing low noise amplification from a received signal of the coupling unit; And
And a reception band intermodulation rejection module for removing the intermodulation signal of the reception band with respect to the output of the low noise amplification module. The method according to claim 1,
Wherein the intermodulation eliminator removes the intermodulation signal asynchronously using an equalizer. A first transmitting step of transmitting a first signal at a first transmitting unit;
A second transmitting step of transmitting a second signal at a second transmitting unit;
A combining step of combining the first transmitter, the second transmitter, and the receiver; And
And a receiving step of removing an intermodulation signal serving as an interference to a reception band of the receiver due to the output of the first transmitter and the second transmitter,
Wherein the receiving step comprises:
An intermodulation generating step of generating the intermodulation signal in an intermodulation generator; And
And an intermodulation canceling step of removing the intermodulation signal from the intermodulation eliminator,
Wherein the intermodulation step comprises performing undermodulation with respect to intermodulation and eliminating interference due to undersampling. delete

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