Modeling and Digital Suppression of Passive Nonlinear Distortion in Simultaneous Transmit—Receive Systems

Waheed, Muhammad Zeeshan; Lampu, Vesa; Kiayanil, Adnan; Fleischer, Marko; Anttila, Lauri; Valkama, Mikko

doi:10.1109/ieeeconf56349.2022.10051880

Cited by 4 publications

(4 citation statements)

References 8 publications

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“…For instance, a corroded metal object near an antenna can reflect a transmitted signal and generate PIM. This phenomenon is known as the Rusty Bolt Effect [34], [53], and rusty metallic objects, such as mesh fences and drain pipes can be sources of IM [21], [33].…”

Section: B Internal and Externalmentioning

confidence: 99%

Overview of Passive Intermodulation in Modern Wireless Networks: Concepts and Cancellation Techniques

Ahmmed,

Kiayani,

Shubair

et al. 2023

IEEE Access

Self Cite

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Passive Intermodulation (PIM) is a well-known phenomenon that poses a significant challenge to modern wireless communication systems. Although efforts have been made to reduce or mitigate the PIM through hardware design, frequency planning, and/or band separation techniques, the impact of PIM on radio performance remains significant. This is especially true for radio transceivers operating in the frequency division duplex mode, which are known to be susceptible to PIM interference. Moreover, with the adoption of carrier aggregation and advanced multi-antenna technology, PIM is increasingly becoming a major problem in multi-band multi-standard radio systems. Therefore, innovative approaches that exploit PIM detection, avoidance, and cancellation techniques are required to effectively mitigate or reduce its impact. In response to these challenges, this study highlights various PIM interference mechanisms and their interactions which cause potential receiver sensitivity degradation. The discussion further explores PIM mitigation strategies, and underscores the potential of digital PIM cancellation solutions to offer a hardware-independent resolution for reducing PIM impact in multi-band radios, in the 5G era and beyond in radio systems.

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Section: B Internal and Externalmentioning

confidence: 99%

Overview of Passive Intermodulation in Modern Wireless Networks: Concepts and Cancellation Techniques

Ahmmed,

Kiayani,

Shubair

et al. 2023

IEEE Access

Self Cite

View full text Add to dashboard Cite

show abstract

“…Digital cancellation techniques are proposed to mitigate receiver desensitization caused by nonlinearity in carrier aggregation transmissions by adopting the approach of nonlinearity parameter estimation followed by interference regeneration and cancellation [12]- [15], however, they can only mitigate the targeted lowerorder nonlinear components such as the third-order crossmodulation and intermodulation products. Similar approach has also been applied to passive intermodulation cancellation in frequency-division duplexing multiple-input multiple-output transceivers operating in the fifth-generation (5G) new radio (NR) bands [16], [17]. A cascaded model considering the third-order RF and baseband nonlinearities in presence of baseband in-phase(I)/quadrature(Q) imbalance (IQI), including receiver (Rx) IQI, is presented and a cascaded adaptive digital mitigation structure is proposed in [18], but each type of impairment is modelled and dealt with separately.…”

Section: Introductionmentioning

confidence: 99%

Digital Post-Cancellation of Nonlinear Interference for Millimeter Wave and Terahertz Systems

Huang,

Zhang,

et al. 2023

Preprint

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Wideband millimeter wave and terahertz systems face severe nonlinearity and other practical impairments such as transmitter and receiver I/Q imbalances (IQIs), carrier frequency offset, and phase noise. Based on a simplified yet effective received signal model, this paper proposes a low-complexity digital post-cancellation (DPC) framework for transmitter IQI and overall system nonlinearity mitigation. The nonlinearity parameters with reduced nonlinearity order are firstly estimated with low-complexity using a novel transmission protocol incorporating both frame rotation and preamble power scaling. Through widely linear system equalization and interference cancellation, the signal distortion caused by frequency-dependent IQI and nonlinearity are then mitigated with significant performance improvement. The mean-squared-error measurement of the EMP-modelled signals also provides a practical means for the nonlinear system identification and characterization. Both simulation and experiment results obtained from a millimeter wave system with 2.5 GHz bandwidth and 73.5 GHz carrier frequency are presented to verify the theoretical analyses and demonstrate the effectiveness of the DPC technology.

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“…For instance, a corroded metal object near an antenna can reflect a transmitted signal and generate PIM. This phenomenon is known as the Rusty Bolt Effect [58,75], and rusty metallic objects, such as mesh fences and drain pipes can be sources of IM [49,59]. Table 2.1 provides a list of common internal and external PIM sources [26,74,76].…”

Section: Internal and Externalmentioning

confidence: 99%

“…PIM has a significant impact on FDD radios [9,75,77] and radios that have high-power TX collocated with sensitive RXs [32,57,59,78,79]. FDD is a widely adopted duplexing scheme for FR1 bands, in which a paired spectrum for simultaneous transmission and reception at different RF frequencies is used [16,80,81].…”

Section: Impact Of Pim On Radio Performancementioning

confidence: 99%

Passive Intermodulation Effects in Modern Radio Communication Systems

Ahmmed

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Passive Intermodulation (PIM) is a well-known phenomenon that poses a significant challenge to modern wireless communication systems. Despite efforts to reduce or mitigate PIM through hardware design, frequency planning, and band separation techniques, the impact of PIM on radio performance remains substantial. Particularly, radio transceivers operating in the frequency division duplex mode are known to be susceptible to PIM problems. Moreover, with the adoption of carrier aggregation and advanced multi-antenna technology, PIM is increasingly becoming a major issue in multi-band multi-standard radio systems. Therefore, innovative approaches that exploit PIM detection, avoidance, and cancellation techniques are required to effectively mitigate or reduce its impact. In response to these challenges, this thesis highlights various PIM interference mechanisms and their interactions that can potentially lead to sensitivity degradation. The thesis continues with a discussion of PIM mitigation approaches and underscores the potential of digital PIM cancellation (PIMC) solutions to offer a hardware-independent resolution for reducing PIM impact in multi-band radios in the 5G era and beyond. Two key contributions are presented as follows:2. Dr. Adnan Kiayani of Ericsson AB, Sweden, for his mentorship, technical expertise, and insightful discussions that enriched my understanding of the subject matter. His mentorship has been instrumental in shaping this thesis.3. Thesis supervisor, Chancellor's Professor Halim Yanikomeroglu, for his unwavering support, guidance, and dedication to my academic development.

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Modeling and Digital Suppression of Passive Nonlinear Distortion in Simultaneous Transmit—Receive Systems

Cited by 4 publications

References 8 publications

Overview of Passive Intermodulation in Modern Wireless Networks: Concepts and Cancellation Techniques

Overview of Passive Intermodulation in Modern Wireless Networks: Concepts and Cancellation Techniques

Digital Post-Cancellation of Nonlinear Interference for Millimeter Wave and Terahertz Systems

Passive Intermodulation Effects in Modern Radio Communication Systems

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