CN114448759B - Interference cancellation system suitable for non-local oscillator homologous dual-polarized signals - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03012—Arrangements for removing intersymbol interference operating in the time domain
- H04L25/03019—Arrangements for removing intersymbol interference operating in the time domain adaptive, i.e. capable of adjustment during data reception
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03165—Arrangements for removing intersymbol interference using neural networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
- H04L2027/0024—Carrier regulation at the receiver end
- H04L2027/0026—Correction of carrier offset
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention discloses an interference cancellation system suitable for non-local oscillator homologous dual-polarized signals, which comprises a main path interference cancellation filter module, an auxiliary path interference cancellation filter module, a first carrier frequency deviation correction module and a second carrier frequency deviation correction module, wherein the main path interference cancellation filter module is used for receiving the non-local oscillator homologous dual-polarized signals; the main path interference cancellation filter module, the sub path interference cancellation filter module, the first carrier frequency deviation correction module and the second carrier frequency deviation correction module form a combined correction loop so as to realize the combined cancellation of polarization interference and carrier frequency deviation; the invention realizes the polarization interference cancellation and the carrier frequency deviation correction simultaneously in a mode of combining the polarization interference and the carrier frequency deviation cancellation, and has wide application range, strong engineering practicability and high processing efficiency.
Description
Technical Field
The invention relates to the technical field of cross polarization interference cancellation, in particular to an interference cancellation system suitable for non-local oscillator homologous dual-polarized signals.
Background
With the development of earth observation technology and remote sensing application requirements, the resolution of satellite payloads is continuously improved, the acquired remote sensing information capacity is increased in geometric progression, and the satellite-earth link transmission rate is higher and higher. Meanwhile, with the rise of high-flux satellite Internet constellations, the transmission rate of a feed link needs to reach Gbps level, and the highest transmission rate can reach 10Gbps. Ultra-high speed data transmission has become a necessary choice for satellite-to-ground data transmission. At present, high-flux satellites and remote sensing satellites at home and abroad have adopted polarization multiplexing technology to improve transmission capacity. The polarization multiplexing technology refers to the transmission of carrier signals with 2 orthogonal polarization directions on the same frequency by using the same satellite-borne transmitting antenna and the same ground receiving antenna. When a carrier wave in a linear polarization form is adopted, a vertical polarized wave and a horizontal polarized wave are selected; when the carrier wave in the circular polarization form is adopted, the left-hand polarized wave and the right-hand polarized wave are selected. Therefore, when the polarization multiplexing technology is adopted, the spectrum efficiency can be improved by 2 times. Due to factors such as polarization isolation of an on-board antenna, polarization isolation of a ground receiving antenna, depolarization of electromagnetic waves by a satellite-ground space propagation link and the like, two paths of orthogonal signals of frequency multiplexing are mutually overlapped, and cross polarization interference is introduced. The performance of the receiving system is drastically deteriorated due to the influence of the cross polarization interference, and the influence of the polarization interference can be eliminated by using the cross polarization interference cancellation method at the receiving end.
Cross-polarization interference cancellation is generally implemented in two ways:
(1) Baseband implementation mode: the baseband implementation mode is that after demodulation and symbol synchronization of two channels are completed, polarization interference cancellation is performed on the synchronous output result of two paths of symbols.
(2) The intermediate frequency implementation mode comprises the following steps: the intermediate frequency implementation mode is based on intermediate frequency sampling data of two paths of signals for processing.
The presently disclosed cross polarization interference algorithm cannot be suitable for all practical application scenarios, under the condition that the frequencies of the transmitting end and the receiving end of the two polarized signals are different, the transmitting carrier frequencies and the receiving carrier frequencies of the two polarized signals have deviations, the polarization cancellation performance depends on the respective deviations of the receiving carrier frequencies, and when the carrier frequency deviation is larger, the polarization cancellation performance is reduced and even fails.
In order to ensure the universality of the cross polarization interference cancellation algorithm, how to normally work the polarization interference cancellation algorithm under the condition that the transmitting end frequency and the receiving end frequency of two paths of polarization signals are different, which is a problem to be solved.
Disclosure of Invention
The object of the present invention is to solve at least one of the technical drawbacks.
Therefore, an object of the present invention is to provide an interference cancellation system suitable for non-local oscillator homologous dual polarized signals, which includes a main path interference cancellation filter module, an auxiliary path interference cancellation filter module, a first carrier frequency deviation correction module and a second carrier frequency deviation correction module; the main path interference cancellation filter module is connected with the first carrier frequency deviation correction module, the first carrier frequency deviation correction module is connected with the second carrier frequency deviation correction module, the second carrier frequency deviation correction module is connected with the secondary path interference cancellation filter module, and the secondary path interference cancellation filter module is connected with the main path interference cancellation filter module; the main path interference cancellation filter module, the sub path interference cancellation filter module, the first carrier frequency deviation correction module and the second carrier frequency deviation correction module form a combined correction loop so as to realize the combined cancellation of polarization interference and carrier frequency deviation;
the main path interference cancellation filter module comprises a first interference cancellation filter and a first filter coefficient updating module, and the auxiliary path interference cancellation filter module comprises a second interference cancellation filter and a second filter coefficient updating module.
The first interference cancellation filter is connected with the first filter coefficient updating module, and the second interference cancellation filter is connected with the second filter coefficient updating module.
The first interference cancellation filter is used for correcting inter-code crosstalk of the main input signal.
The first filter coefficient updating module obtains a first interference cancellation filter coefficient through an LMS self-adaptive updating algorithm, and sends the first interference cancellation filter coefficient to the first interference cancellation filter to realize real-time correction of inter-code crosstalk.
The first carrier frequency deviation correction module is used for receiving and transmitting carrier frequency deviation correction of the main input signal.
The second interference cancellation filter is used to correct polarization interference from the input signal to the main input signal.
The second filter coefficient updating module obtains a second interference cancellation filter coefficient through an LMS self-adaptive updating algorithm, and sends the second interference cancellation filter coefficient to a second interference cancellation filter to realize polarization interference real-time correction.
The second carrier frequency deviation correction module is used for correcting deviation of receiving and transmitting carrier frequency deviation of the secondary path input signal and the main path input signal.
Preferably, the first interference cancellation filter coefficient update formula in the first filter coefficient update module is:
wherein the method comprises the steps ofFor the first interference cancellation filter coefficient at time k+1,/for>For the first interference cancellation filter coefficient at k time instants, μ is the update step, err derot For the signal after the carrier difference signal frequency offset of the output actual signal and the ideal signal is derotated, R H Is the input signal of the main path.
In any of the above schemes, it is preferable that the phase discrimination error extraction formula in the first carrier frequency deviation correction module:
in the phase discrimination error extraction formula in the first carrier frequency deviation correction moduleFor the output ideal signal err is the vector difference of the output actual signal and the ideal signal.
In any of the above schemes, preferably, the second interference cancellation filter coefficient update formula in the second filter coefficient update module is:
wherein the method comprises the steps ofWhen k+1 is usedInscribed second interference cancellation filter coefficients, < >>For the second interference cancellation filter coefficient at time k, μ is the update step, ph HV The phase to be corrected for the second interference cancellation filter err derot For the signal after the carrier difference signal frequency offset of the output actual signal and the ideal signal is derotated, R V Is the input signal of the slave.
In any of the above schemes, it is preferable that the phase discrimination error extraction formula in the first carrier frequency deviation correction module: imag (S) V_rot * ·err derot )。
S in phase discrimination error extraction formula in first carrier frequency deviation correction module V_rot Err for polarization-disturbance correction derot And the signal is a signal after the vector difference signal frequency offset of the output actual signal and the ideal signal is derotated.
In any of the above-described aspects it is preferred that,wherein->For the actual signal output, +.>To output an ideal signal.
In any of the above schemes, preferably err derot ＝err·ph H * The method comprises the steps of carrying out a first treatment on the surface of the Wherein ph is H * Err is the vector difference between the actual signal output and the ideal signal, which is the conjugate of the phase to be corrected for the first interference canceller.
In any of the above-described aspects it is preferred that,wherein->For the actual signal output, +.>To output an ideal signal.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the invention realizes the polarization interference cancellation and the carrier frequency deviation correction simultaneously in a mode of combining the polarization interference and the carrier frequency deviation, so that the invention is suitable for the scenes of the homology and the different sources of the frequencies of the transmitting end and the receiving end of two paths of polarization signals and has strong engineering practicability.
2. The invention can be used for all scenes of same-frequency dual polarization, including satellite-ground remote sensing signal receiving, satellite communication signal receiving and transmitting, ground wireless signal relay, large-capacity wireless data return and the like, and has wide application range.
3. The invention is applicable to the reception of narrowband signals, wideband signals and ultra wideband signals, and has wide symbol rate range; the cancellation performance of the polarization interference can reach-1 dB to-50 dB, and the cancellation performance of the polarization interference is high.
4. The invention is realized mainly by the self-adaptive filtering algorithm and the phase-locked loop algorithm, the required logic realization resource only needs partial multiplier resource, a small amount of LUT resource and RAM resource, no complex equipment is needed, and the engineering realization is strong.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
fig. 1 is a block diagram of an interference cancellation system suitable for non-local oscillator-homologous dual polarized signals according to an embodiment of the present invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
As shown in fig. 1, an interference cancellation system applicable to non-local oscillation homologous dual-polarized signals in the embodiment of the invention includes a main path interference cancellation filter module, an auxiliary path interference cancellation filter module, a first carrier frequency deviation correction module 3 and a second carrier frequency deviation correction module 4; the main path interference cancellation filter module is connected with the first carrier frequency deviation correction module 3, the first carrier frequency deviation correction module is connected with the second carrier frequency deviation correction module 4, the second carrier frequency deviation correction module 4 is connected with the secondary path interference cancellation filter module, and the secondary path interference cancellation filter module is connected with the main path interference cancellation filter module; the main path interference cancellation filter module, the sub path interference cancellation filter module, the first carrier frequency deviation correction module and the second carrier frequency deviation correction module form a combined correction loop to realize the combined cancellation of polarization interference and carrier frequency deviation.
The main path interference cancellation filter module comprises a first interference cancellation filter 1 and a first filter coefficient updating module 2,
the secondary interference cancellation filter module includes a second interference cancellation filter 5 and a second filter coefficient update module 6.
The first interference cancellation filter 1 is connected to the first filter coefficient updating module 2, and the second interference cancellation filter 5 is connected to the second filter coefficient updating module 6.
The first interference cancellation filter is used for correcting inter-code crosstalk of the main input signal.
The first filter coefficient updating module obtains the filter coefficient of the first interference cancellation filter through an LMS self-adaptive updating algorithm, and sends the filter coefficient of the first interference cancellation filter to realize inter-code crosstalk real-time correction.
The first carrier frequency deviation correction module is used for receiving and transmitting carrier frequency deviation correction of the main input signal.
The second interference cancellation filter is used to correct polarization interference from the input signal to the main input signal.
The second filter coefficient updating module obtains the filter coefficient of the second interference cancellation filter through an LMS self-adaptive updating algorithm, and sends the filter coefficient of the second interference cancellation filter to realize real-time correction of polarization interference.
The second carrier frequency deviation correction module is used for correcting deviation of receiving and transmitting carrier frequency deviation of the secondary path input signal and the main path input signal.
The embodiment of the invention can be used for all scenes with the same frequency and dual polarization, including satellite-ground remote sensing signal receiving, satellite communication signal receiving and transmitting, ground wireless signal relay, large-capacity wireless data returning and the like, and has the advantages of wide application range, high working efficiency and more enterprise cost saving.
Specifically, a first interference cancellation filter coefficient update formula in the first filter coefficient update module is:
wherein the method comprises the steps ofFor the first interference cancellation filter coefficient at time k+1,/for>For the first interference cancellation filter coefficient at k time instants, μ is the update step, err derot For the signal after the carrier difference signal frequency offset of the output actual signal and the ideal signal is derotated, R H An input signal of a main path; err (r) derot * ·R H The signal after the frequency deviation derotation of the vector difference signal representing the output actual signal and the ideal signal is conjugated and then multiplied with the main input signal.
Specifically, the phase discrimination error extraction formula in the first carrier frequency deviation correction module:in the phase discrimination error extraction formula in the first carrier frequency deviation correction module +.>For the output ideal signal, the output ideal signal is a determined value which can be obtained in advance, err is the vector difference between the output actual signal and the ideal signal; imag () is an imaginary function that is complex; />Representing the output ideal signal conjugate and the vector difference of the output actual signal and the ideal signal.
Specifically, the second interference cancellation filter coefficient update formula in the second filter coefficient update module is:
wherein the method comprises the steps ofSecond interference cancellation filter coefficient at time k+1,/for>For the second interference cancellation filter coefficient at time k, μ is the update step, ph HV The phase to be corrected for the second interference cancellation filter,
err derot for the signal after the carrier difference signal frequency offset of the output actual signal and the ideal signal is derotated, R V Is the input signal of the slave.
(ph HV ·err derot ) * ·R V Indicating the phase (ph) of the second interference cancellation filter to be corrected HV ) The signal after derotation with the frequency offset of the vector difference signal (i.e., err derot ) Conjugate after multiplication, and then combine with the slave input signal (i.e. R V ) Multiplying.
Specifically, the phase discrimination error extraction formula in the first carrier frequency deviation correction module: imag (S) V_rot * ·err derot ) The method comprises the steps of carrying out a first treatment on the surface of the S in phase discrimination error extraction formula in first carrier frequency deviation correction module V_rot Err for polarization-disturbance correction derot The signal after the frequency offset derotation is carried out on the vector difference signal of the output actual signal and the ideal signal; imag () is an imaginary function that is complex; s is S V_rot * ·err derot And the signal is multiplied by the carrier difference signal frequency offset derotation of the output actual signal and the ideal signal after representing the conjugation of the polarization interference correction value.
Further, the method comprises the steps of,err derot ＝err·ph H * the method comprises the steps of carrying out a first treatment on the surface of the Where err is the difference in vector between the actual signal and the ideal signal of the output, +.>For the actual signal output, +.>Is an ideal signal for output; err (r) derot For the signal after the frequency deviation derotation of the vector difference signal of the output actual signal and the ideal signal, ph H * Phase conjugation, which requires correction for the first interference canceller.
The working principle of the invention is as follows: input signal of main path (R H ) Is input into a first interference cancellation filter which corrects inter-code crosstalk of the main input signal, and the first interference cancellation filter coefficient (W HH ) From the first filter coefficient updating module, the output signal (R V ) Is input into a second interference cancellation filter which corrects polarization interference from the input signal to the main input signal, and the second interference cancellation filter coefficient (W HV ) From the second filter coefficient updating module; the phase correction signal (ph) output from the second interference cancellation filter and output from the second carrier frequency deviation correction module HV ) Multiplication to obtain a polarization-disturbance correction value signal (S V_rot ) The polarization interference correction value signal is divided into two paths, one path of polarization interference correction value signal is fed back to the second carrier frequency deviation correction module, the other path of polarization interference correction value signal is added with the main path signal output by the first interference cancellation filter, and the added main path signal is added with the phase correction signal (ph H ) Multiplying, dividing the multiplied main path signal into two paths, one path being the actual signalThe other path of the output signal is subtracted from the output ideal signal to obtain an actual signal +.>And ideal signal->Is divided into two paths, one path is output to a first carrier deviation correction module, and the phase correction signal (ph H ) Is divided into two paths, one path of phase correction signal is multiplied by the added main path signal, and the other path of phase correction signal is conjugated (ph) H * ) Multiplying the signal with another vector difference (err) to obtain a signal (err) after the frequency offset derotation derot ) The frequency offset derotated signal (err derot ) The method comprises the steps of dividing the frequency offset into three paths, outputting a signal after the frequency offset is derotated in a first filter coefficient updating module, outputting a signal after the frequency offset is derotated in a second carrier frequency deviation correcting module, and outputting two paths of phase correction signals (ph HV ) The first phase correction signal (ph HV ) Multiplied by the slave signal output from the first interference cancellation filter, and a second phase correction signal (ph HV ) And the signal (err) after derotation with the third frequency offset derot ) And the multiplied conjugate is output to a second filter coefficient updating module.
The invention realizes the polarization interference cancellation and the carrier frequency deviation correction simultaneously in a mode of combining the polarization interference and the carrier frequency deviation, so the invention is suitable for the scenes of the homology and the different sources of the frequencies of the transmitting end and the receiving end of two paths of polarization signals, has strong engineering practicability, and the required logic realization resources only need partial multiplier resources, a small amount of LUT resources and RAM resources, has high processing efficiency and saves more resources.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
It will be readily understood by those skilled in the art that the present invention, including any combination of parts described in the summary and detailed description of the invention above and shown in the drawings, is limited in scope and does not constitute a complete description of the various aspects of these combinations for the sake of brevity. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Although embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives, and variations may be made in the above embodiments by those skilled in the art without departing from the spirit and principles of the invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. An interference cancellation system suitable for non-local oscillator homologous dual polarized signals, which is characterized in that: the system comprises a main path interference cancellation filter module, an auxiliary path interference cancellation filter module, a first carrier frequency deviation correction module and a second carrier frequency deviation correction module; the main path interference cancellation filter module is connected with the first carrier frequency deviation correction module, the first carrier frequency deviation correction module is connected with the second carrier frequency deviation correction module, the second carrier frequency deviation correction module is connected with the auxiliary path interference cancellation filter module, and the auxiliary path interference cancellation filter module is connected with the main path interference cancellation filter module; the main path interference cancellation filter module, the sub path interference cancellation filter module, the first carrier frequency deviation correction module and the second carrier frequency deviation correction module form a combined correction loop so as to realize the combined cancellation of polarization interference and carrier frequency deviation;
the main path interference cancellation filter module comprises a first interference cancellation filter and a first filter coefficient updating module, and the sub path interference cancellation filter module comprises a second interference cancellation filter and a second filter coefficient updating module;
the first interference cancellation filter is used for correcting inter-code crosstalk of the main path input signal;
the first filter coefficient updating module obtains a first interference cancellation filter coefficient through an LMS self-adaptive updating algorithm, and sends the first interference cancellation filter coefficient to the first interference cancellation filter so as to realize real-time correction of inter-code crosstalk;
the first carrier frequency deviation correction module is used for receiving and transmitting carrier frequency deviation correction of a main input signal;
the second interference cancellation filter is used for correcting polarization interference from the aliasing of the input signal to the main input signal;
the second filter coefficient updating module obtains a second interference cancellation filter coefficient through an LMS self-adaptive updating algorithm, and sends the second interference cancellation filter coefficient to the second interference cancellation filter to realize real-time correction of polarization interference;
the second carrier frequency deviation correction module is used for correcting deviation of receiving and transmitting carrier frequency deviation of the secondary path input signal and the main path input signal.
2. An interference cancellation system for non-local oscillator-homologous dual polarized signals as claimed in claim 1, wherein: the first interference cancellation filter coefficient updating formula in the first filter coefficient updating module is as follows:
wherein,for the first interference cancellation filter coefficient at time k+1,/for>For the first interference cancellation filter coefficient at k time instants, μ is the update step, err derot For the signal after the carrier difference signal frequency offset of the output actual signal and the ideal signal is derotated, R H Is the input signal of the main path.
3. An interference cancellation system for non-local oscillator-homologous dual polarized signals as claimed in claim 1, wherein: the phase discrimination error extraction formula in the first carrier frequency deviation correction module comprises the following steps:
in the phase discrimination error extraction formula in the first carrier frequency deviation correction moduleFor outputting an ideal signal err is the vector difference of the actual signal output and the ideal signal.
4. An interference cancellation system for non-local oscillator-homologous dual polarized signals as claimed in claim 1, wherein: the second interference cancellation filter coefficient updating formula in the second filter coefficient updating module is as follows:
wherein the method comprises the steps ofSecond interference cancellation filter coefficient at time k+1,/for>For the second interference cancellation filter coefficient at time k, μ is the update step, ph HV The phase to be corrected for the second interference cancellation filter err derot For the signal after the carrier difference signal frequency offset of the output actual signal and the ideal signal is derotated, R V Is the input signal of the slave.
5. An interference cancellation system for non-local oscillator-homologous dual polarized signals as claimed in claim 1, wherein: the phase discrimination error extraction formula in the first carrier frequency deviation correction module comprises the following steps: imag (S) V_rot * ·err derot )；
S in the phase discrimination error extraction formula in the first carrier frequency deviation correction module V_rot Err for polarization-disturbance correction derot And the signal is a signal after the vector difference signal frequency offset of the output actual signal and the ideal signal is derotated.
6. An interference cancellation system for non-local oscillator-homologous dual polarized signals as claimed in claim 3, wherein:wherein->For the actual signal output, +.>Is the ideal signal for output.
7. An interference cancellation system for non-local oscillator-homologous dual polarized signals as claimed in claim 2 or claim 4 or claim 5, characterized in that: err (r) derot ＝ err ·ph H * The method comprises the steps of carrying out a first treatment on the surface of the Wherein ph is H * Err is the vector difference between the actual signal output and the ideal signal, which is the conjugate of the phase to be corrected for the first interference canceller.
8. The interference cancellation system for non-local oscillator-homologous dual polarized signals of claim 7, wherein:wherein->For the actual signal output, +.>Is the ideal signal for output.
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