Improving Isolation in Monostatic Simultaneous Transmit and Receive Systems Using a Quasi-Symmetrical Self-Interference Cancellation Architecture
For simultaneous transmit (Tx) and receive (Rx), it is a common practice, with monostatic full duplex (FD) systems, to use a single antenna and a circulator to provide isolation between the transmit and receive radio chains. However, most circulators currently on the market are designed to provide 1...
| Auteurs principaux: | , , , , |
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| Format: | Article |
| Langue: | English |
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IEEE
2023-01-01
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| Collection: | IEEE Journal of Microwaves |
| Sujets: | |
| Accès en ligne: | https://ieeexplore.ieee.org/document/9999130/ |
| _version_ | 1827973790087249920 |
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| author | Md Nurul Anwar Tarek Marisol Roman Guerra Anthony Nunez MD Nazim Uddin Elias A. Alwan |
| author_facet | Md Nurul Anwar Tarek Marisol Roman Guerra Anthony Nunez MD Nazim Uddin Elias A. Alwan |
| author_sort | Md Nurul Anwar Tarek |
| collection | DOAJ |
| description | For simultaneous transmit (Tx) and receive (Rx), it is a common practice, with monostatic full duplex (FD) systems, to use a single antenna and a circulator to provide isolation between the transmit and receive radio chains. However, most circulators currently on the market are designed to provide 12 to 20 dB of Tx/Rx port isolation, which is not sufficient for full duplex (FD) microwave communication. In fact, it is necessary to provide at least <inline-formula><tex-math notation="LaTeX">$>$</tex-math></inline-formula>30 dB of isolation to prevent the receiver desensitization that is caused by the leakage of high-power transmit signals. For this reason, practical simultaneous transmit and receive (STAR) systems require additional cancellation stages. In this paper, we present a novel STAR system that incorporates two circulators, a hybrid coupler, and a self-interference cancellation (SIC) circuit, based on a Finite Impulse Response (FIR) topology. Our design achieves an average Tx/Rx port isolation of <inline-formula><tex-math notation="LaTeX">$\sim$</tex-math></inline-formula>37 dB over a 25 MHz bandwidth (<italic>viz.</italic> 2.395–2.42 GHz) in simulation, with a minimum and maximum cancellations of 35 dB and 41 dB, respectively. A prototype was fabricated and tested showing good agreement with the simulations. All in all, the prototype achieved an average cancellation of 36 dB, with a cancellation range of 33 dB to 42 dB. |
| first_indexed | 2024-04-09T19:43:23Z |
| format | Article |
| id | doaj.art-91c338f587c24f3ea982ff4e3fd6e8a5 |
| institution | Directory Open Access Journal |
| issn | 2692-8388 |
| language | English |
| last_indexed | 2024-04-09T19:43:23Z |
| publishDate | 2023-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Journal of Microwaves |
| spelling | doaj.art-91c338f587c24f3ea982ff4e3fd6e8a52023-04-03T23:00:55ZengIEEEIEEE Journal of Microwaves2692-83882023-01-013265566410.1109/JMW.2022.32272429999130Improving Isolation in Monostatic Simultaneous Transmit and Receive Systems Using a Quasi-Symmetrical Self-Interference Cancellation ArchitectureMd Nurul Anwar Tarek0https://orcid.org/0000-0002-7105-0983Marisol Roman Guerra1https://orcid.org/0000-0002-3977-1967Anthony Nunez2https://orcid.org/0000-0002-3367-471XMD Nazim Uddin3https://orcid.org/0000-0001-6406-4618Elias A. Alwan4https://orcid.org/0000-0002-6011-0207Department of Electrical Engineering, Florida International University, Miami, FL, USADepartment of Electrical Engineering, Florida International University, Miami, FL, USADepartment of Electrical Engineering, Florida International University, Miami, FL, USADepartment of Electrical Engineering, Florida International University, Miami, FL, USADepartment of Electrical Engineering, Florida International University, Miami, FL, USAFor simultaneous transmit (Tx) and receive (Rx), it is a common practice, with monostatic full duplex (FD) systems, to use a single antenna and a circulator to provide isolation between the transmit and receive radio chains. However, most circulators currently on the market are designed to provide 12 to 20 dB of Tx/Rx port isolation, which is not sufficient for full duplex (FD) microwave communication. In fact, it is necessary to provide at least <inline-formula><tex-math notation="LaTeX">$>$</tex-math></inline-formula>30 dB of isolation to prevent the receiver desensitization that is caused by the leakage of high-power transmit signals. For this reason, practical simultaneous transmit and receive (STAR) systems require additional cancellation stages. In this paper, we present a novel STAR system that incorporates two circulators, a hybrid coupler, and a self-interference cancellation (SIC) circuit, based on a Finite Impulse Response (FIR) topology. Our design achieves an average Tx/Rx port isolation of <inline-formula><tex-math notation="LaTeX">$\sim$</tex-math></inline-formula>37 dB over a 25 MHz bandwidth (<italic>viz.</italic> 2.395–2.42 GHz) in simulation, with a minimum and maximum cancellations of 35 dB and 41 dB, respectively. A prototype was fabricated and tested showing good agreement with the simulations. All in all, the prototype achieved an average cancellation of 36 dB, with a cancellation range of 33 dB to 42 dB.https://ieeexplore.ieee.org/document/9999130/Coupling signalin-band full duplex (IBFD)simultaneous transmit and receive (STAR)self-interference cancellation (SIC) |
| spellingShingle | Md Nurul Anwar Tarek Marisol Roman Guerra Anthony Nunez MD Nazim Uddin Elias A. Alwan Improving Isolation in Monostatic Simultaneous Transmit and Receive Systems Using a Quasi-Symmetrical Self-Interference Cancellation Architecture IEEE Journal of Microwaves Coupling signal in-band full duplex (IBFD) simultaneous transmit and receive (STAR) self-interference cancellation (SIC) |
| title | Improving Isolation in Monostatic Simultaneous Transmit and Receive Systems Using a Quasi-Symmetrical Self-Interference Cancellation Architecture |
| title_full | Improving Isolation in Monostatic Simultaneous Transmit and Receive Systems Using a Quasi-Symmetrical Self-Interference Cancellation Architecture |
| title_fullStr | Improving Isolation in Monostatic Simultaneous Transmit and Receive Systems Using a Quasi-Symmetrical Self-Interference Cancellation Architecture |
| title_full_unstemmed | Improving Isolation in Monostatic Simultaneous Transmit and Receive Systems Using a Quasi-Symmetrical Self-Interference Cancellation Architecture |
| title_short | Improving Isolation in Monostatic Simultaneous Transmit and Receive Systems Using a Quasi-Symmetrical Self-Interference Cancellation Architecture |
| title_sort | improving isolation in monostatic simultaneous transmit and receive systems using a quasi symmetrical self interference cancellation architecture |
| topic | Coupling signal in-band full duplex (IBFD) simultaneous transmit and receive (STAR) self-interference cancellation (SIC) |
| url | https://ieeexplore.ieee.org/document/9999130/ |
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