Passive Intermodulation in Simultaneous Transmit–Receive Systems: Modeling and Digital Cancellation Methods

Waheed, Muhammad Zeeshan; Korpi, Dani; Anttila, Lauri; Kiayani, Adnan; Kosunen, Marko; Stadius, Kari; Campo, Pablo Pascual; Turunen, Matias; Allén, Markus; Ryynänen, Jussi; Valkama, Mikko

doi:10.1109/tmtt.2020.2996206

Cited by 29 publications

(21 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Since the transmit CCs are distorted in a nonlinear fashion by each of the individual PAs before entering a PIM nonlinearity, this implies that the self-interference is in fact a combination of two nonlinearities. This has been identified recently in [12] and [13], where different digital cancellers for joint mitigation of PA and PIM nonlinerities are proposed and experimented.…”

Section: Introductionmentioning

confidence: 92%

“…Generally speaking, as shown in [12] and [13], the TX PAs can also cause nonlinear distortion to the individual transmit carriers, leading to spectral regrowth around the main transmit carriers. Such nonlinear distortion in the transmit CCs can then affect the overall characteristics of the PIMinduced self-interference and its cancellation.…”

Section: Baseband Equivalent Models For Passive Intermodulation At Rx...mentioning

confidence: 99%

“…For presentation purposes and notational simplicity, we focus on third-order PIM effects, while more elaborate higherorder cases as well as coexisting cascaded nonlinearities are addressed in [13].…”

Section: Baseband Equivalent Models For Passive Intermodulation At Rx...mentioning

confidence: 99%

See 2 more Smart Citations

Digital Cancellation of Passive Intermodulation in FDD Transceivers

Waheed

Campo

Korpi

et al. 2018

2018 52nd Asilomar Conference on Signals, Systems, and Computers

Self Cite

View full text Add to dashboard Cite

Modern radio systems and transceivers utilize carrier aggregation (CA) to meet the demands for higher and higher data rates. However, the adoption of CA in the existing Long Term Evolution (LTE)-Advanced and emerging 5G New Radio (NR) mobile networks, in case of frequency division duplexing (FDD), may incur self-interference challenges with certain band combinations. More specifically, the nonlinear distortion products of the transmit signals or component carriers (CCs), stemming from the passive radio frequency (RF) front-end components of the transceiver, can appear in one or more of the configured receiver bands, potentially leading to the receiver desensitization. In this paper, we present advanced baseband equivalent signal models for such passive intermodulation (PIM) distortion viewed from the RX point of view, considering also potential memory effects in the PIM generation. Then, building on these signal models, a digital self-interference cancellation technique operating in the transceiver digital front-end is presented. The performance of the proposed solution is evaluated with real-life RF measurements for LTE-Advanced type user equipment (UE) with dual CC interband CA, demonstrating excellent suppression properties. The findings in this work indicate that digital cancellation is a feasible approach for improving the receiver sensitivity of mobile devices that may be prone to RF front-end induced PIM challenges.

show abstract

Section: Introductionmentioning

confidence: 92%

Section: Baseband Equivalent Models For Passive Intermodulation At Rx...mentioning

confidence: 99%

See 1 more Smart Citation

Digital Cancellation of Passive Intermodulation in FDD Transceivers

Waheed

Campo

Korpi

et al. 2018

2018 52nd Asilomar Conference on Signals, Systems, and Computers

Self Cite

View full text Add to dashboard Cite

show abstract

“…where Z c (ω n , x) is a local impedance at carrier frequency ω n , and δS is a differential area of the contact spot. An equivalent thermal resistance R th,eq (ω n ) can be defined as [37] R th,eq (ω n ) = Re R th 1 + R th jω n C th (8) where R th and C th are the thermal resistance and thermal capacitance, respectively. They form a thermal node shown in Figure 5.…”

Section: Self-heating Effect and Nonlinearity Of Contact Resistivitymentioning

confidence: 99%

“…The stringent requirements for the integrity of information signals push the limits of radio frequency (RF) hardware. Weak nonlinearities of passive devices such as antennas, filters, couplers and multiplexers at the RF front-end of the smart multi-radio base stations and user terminals generate spurious emissions, corrupt information signals and debilitate system performance [8][9][10]. Therefore, mitigation of nonlinear signal distortions is a major requirement to dynamically adjustable RF front-ends, their passive components and reconfigurable antennas [11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Passive Intermodulation at Contacts of Rough Conductors

Dayan

Huang

Schuchinsky

2022

Electronic Materials

View full text Add to dashboard Cite

Passive intermodulation (PIM) is a niggling phenomenon that debilitates the performance of modern communications and navigation systems. PIM products interfere with information signals and cause their nonlinear distortion. The sources and basic mechanisms of PIM have been studied in the literature but PIM remains a serious problem of signal integrity. In this paper, the main sources and mechanisms of PIM generation by joints of good conductors are discussed. It is shown that the passive electrical, thermal and mechanical nonlinearities are intrinsically linked despite their distinctively different time scales. The roughness of the contact surfaces plays an important role in PIM generation by conductor joints. A review of the PIM phenomenology at the contacts of the good conductors suggests that novel multiphysics models are necessary for the analysis and reliable prediction of PIM products generated by several concurrent nonlinearities of a diverse physical nature.

show abstract

A SiC/C foam microwave absorbing material for PIM darkroom box in simulating space environment

Qin

et al. 2022

Ceramics International

View full text Add to dashboard Cite

Passive Intermodulation in Simultaneous Transmit–Receive Systems: Modeling and Digital Cancellation Methods

Cited by 29 publications

References 27 publications

Digital Cancellation of Passive Intermodulation in FDD Transceivers

Digital Cancellation of Passive Intermodulation in FDD Transceivers

Passive Intermodulation at Contacts of Rough Conductors

A SiC/C foam microwave absorbing material for PIM darkroom box in simulating space environment

Contact Info

Product

Resources

About