Cognitive Networks in the Presence of I/Q Imbalance and Imperfect CSI: Receiver Design and Performance Analysis
Future wireless communication systems, including fifth-generation (5G) networks and the Internet of Things (IoT), require a massive number of inexpensive transceivers. These transceivers come with various hardware impairments, such as phase noise and in-phase/quadrature phase (I/Q) imbalance. This p...
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| Format: | Article |
| Language: | English |
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IEEE
2019-01-01
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| Series: | IEEE Access |
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| Online Access: | https://ieeexplore.ieee.org/document/8693886/ |
| _version_ | 1818416137619111936 |
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| author | Malek Mohammad Alsmadi Ayse Elif Canbilen Najah Abu Ali Salama Said Ikki Ertugrul Basar |
| author_facet | Malek Mohammad Alsmadi Ayse Elif Canbilen Najah Abu Ali Salama Said Ikki Ertugrul Basar |
| author_sort | Malek Mohammad Alsmadi |
| collection | DOAJ |
| description | Future wireless communication systems, including fifth-generation (5G) networks and the Internet of Things (IoT), require a massive number of inexpensive transceivers. These transceivers come with various hardware impairments, such as phase noise and in-phase/quadrature phase (I/Q) imbalance. This piece of work studies the performance of underlay cognitive radio (CR) networks, considering the joint effect of I/Q imbalance and imperfect channel-state information (CSI) at the secondary user. In order to mitigate the effect of I/Q imbalance, an optimal maximum likelihood (ML) receiver design is proposed and analyzed. Specifically, a closed-form expression of the average pairwise error probability (APEP) and a tight upper bound of the average bit error rate (ABER) are derived. In addition, a widely linear equalization (WLE) receiver that has performance close to the optimal receiver with a computational complexity close to the traditional blind receiver is proposed. In particular, the exact PEP of this WLE receiver is obtained and its APEP is calculated numerically. Moreover, an exact expression is derived for Cramer-Rao lower bound (CRLB) of the secondary system receiver channel estimation error in the presence of I/Q imbalance at the secondary transmitter/receiver (STx/SRx) sides. Computer simulations prove the analytical results of the proposed receivers. The obtained results show that the optimal receiver has the best performance and the WLE receiver outperforms the traditional ML receiver in most cases. In addition, the analysis shows that the best estimator that reaches the CRLB is not affected by the I/Q imbalance at STx/SRx. |
| first_indexed | 2024-12-14T11:46:06Z |
| format | Article |
| id | doaj.art-41977d9020ec4031a948db4ec3f8621f |
| institution | Directory Open Access Journal |
| issn | 2169-3536 |
| language | English |
| last_indexed | 2024-12-14T11:46:06Z |
| publishDate | 2019-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Access |
| spelling | doaj.art-41977d9020ec4031a948db4ec3f8621f2022-12-21T23:02:35ZengIEEEIEEE Access2169-35362019-01-017497654977710.1109/ACCESS.2019.29087878693886Cognitive Networks in the Presence of I/Q Imbalance and Imperfect CSI: Receiver Design and Performance AnalysisMalek Mohammad Alsmadi0https://orcid.org/0000-0002-0237-8002Ayse Elif Canbilen1https://orcid.org/0000-0003-1891-5703Najah Abu Ali2https://orcid.org/0000-0002-9777-9609Salama Said Ikki3Ertugrul Basar4https://orcid.org/0000-0001-5566-2392Electrical and Computer Engineering Department, Lakehead University, Thunder Bay, ON, CanadaElectrical and Electronics Engineering Department, Konya Technical University, Konya, TurkeyInformation Technology College, United Arab Emirates (UAE) University, Al Ain, UAEElectrical and Computer Engineering Department, Lakehead University, Thunder Bay, ON, CanadaDepartment of Electrical and Electronics Engineering, Communications Research and Innovation Laboratory (CoreLab), Koç University, Istanbul, TurkeyFuture wireless communication systems, including fifth-generation (5G) networks and the Internet of Things (IoT), require a massive number of inexpensive transceivers. These transceivers come with various hardware impairments, such as phase noise and in-phase/quadrature phase (I/Q) imbalance. This piece of work studies the performance of underlay cognitive radio (CR) networks, considering the joint effect of I/Q imbalance and imperfect channel-state information (CSI) at the secondary user. In order to mitigate the effect of I/Q imbalance, an optimal maximum likelihood (ML) receiver design is proposed and analyzed. Specifically, a closed-form expression of the average pairwise error probability (APEP) and a tight upper bound of the average bit error rate (ABER) are derived. In addition, a widely linear equalization (WLE) receiver that has performance close to the optimal receiver with a computational complexity close to the traditional blind receiver is proposed. In particular, the exact PEP of this WLE receiver is obtained and its APEP is calculated numerically. Moreover, an exact expression is derived for Cramer-Rao lower bound (CRLB) of the secondary system receiver channel estimation error in the presence of I/Q imbalance at the secondary transmitter/receiver (STx/SRx) sides. Computer simulations prove the analytical results of the proposed receivers. The obtained results show that the optimal receiver has the best performance and the WLE receiver outperforms the traditional ML receiver in most cases. In addition, the analysis shows that the best estimator that reaches the CRLB is not affected by the I/Q imbalance at STx/SRx.https://ieeexplore.ieee.org/document/8693886/Channel estimation errorscognitive radioCramer–Rao lower bounderror performance analysishardware impairmentsI/Q imbalance |
| spellingShingle | Malek Mohammad Alsmadi Ayse Elif Canbilen Najah Abu Ali Salama Said Ikki Ertugrul Basar Cognitive Networks in the Presence of I/Q Imbalance and Imperfect CSI: Receiver Design and Performance Analysis IEEE Access Channel estimation errors cognitive radio Cramer–Rao lower bound error performance analysis hardware impairments I/Q imbalance |
| title | Cognitive Networks in the Presence of I/Q Imbalance and Imperfect CSI: Receiver Design and Performance Analysis |
| title_full | Cognitive Networks in the Presence of I/Q Imbalance and Imperfect CSI: Receiver Design and Performance Analysis |
| title_fullStr | Cognitive Networks in the Presence of I/Q Imbalance and Imperfect CSI: Receiver Design and Performance Analysis |
| title_full_unstemmed | Cognitive Networks in the Presence of I/Q Imbalance and Imperfect CSI: Receiver Design and Performance Analysis |
| title_short | Cognitive Networks in the Presence of I/Q Imbalance and Imperfect CSI: Receiver Design and Performance Analysis |
| title_sort | cognitive networks in the presence of i q imbalance and imperfect csi receiver design and performance analysis |
| topic | Channel estimation errors cognitive radio Cramer–Rao lower bound error performance analysis hardware impairments I/Q imbalance |
| url | https://ieeexplore.ieee.org/document/8693886/ |
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