Analysis of Inter-Modulation Products and Nonlinear Distortion in RF OFDM Transmitter Systems

O’Dróma, Máirtín; Lei, Yiming; Bertrán, E.; Gilabert, Pere L.

doi:10.1109/vetecs.2009.5073392

Cited by 6 publications

(2 citation statements)

References 13 publications

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“…The WLAN power amplifier (PA) shows a non-linear behavior for QAM modulations at higher signal levels. Higher QAM performance requires tight linearization of the power amplifier because any PA distortion may lead to inter-modulation distortion (IMD) products [65], which may violate the spectral masks which was the system defined in [66].…”

Section: B Phymentioning

confidence: 99%

Outdoor Long-Range WLANs: A Lesson for IEEE 802.11ah

Aust

Prasad

Niemegeers

2015

IEEE Commun. Surv. Tutorials

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Several service applications have been reported by many, who proposed the use of wireless LANs (WLANs) over a wide variety of outdoor deployments. In particular, the upcoming IEEE 802.11ah WLAN protocol will enable a longer transmission range between WLAN access points (APs) and stations (STAs) up to multiple kilometers using carrier frequencies at 900 MHz. However, limitations of WLAN outdoor installations have been found of the plethora of WLAN protocols in experimental studies. This article summarizes the challenges and provides a comprehensive overview of suggested improvements. As the standardization of the IEEE 802.11ah is reaching its final stage, important protocol aspects as well as new features are to be outlined. Interference problems and issues with the WLAN configuration, the physical layer (PHY), and media access control (MAC) are of paramount importance in outdoor WLAN networks; thus, are discussed in detail. Further, we examine the reported upper boundaries in throughput and link reliability of long-range WLANs in different environments, including seasurfaces, unmanned aerial vehicles (UAVs) and tunnels. At the end of this study, we reflect on the major issues regarding sub-1 GHz (S1G) WLANs and propose avenues for further research.Index Terms-WLAN, IEEE 802.11ah, wireless sensor, sub-1 GHz, long-range, outdoor.

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Section: B Phymentioning

confidence: 99%

Outdoor Long-Range WLANs: A Lesson for IEEE 802.11ah

Aust

Prasad

Niemegeers

2015

IEEE Commun. Surv. Tutorials

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“…Although the probability distribution function of φ l in equation (5) is not a continuous function over the phase domain, due to the huge number of possible sets {n l }, the phases of all IMPs, from a macro perspective, might be regarded as a quasi uniform distributed function over phase domain from 0 to 2π, [16].…”

Section: Bmentioning

confidence: 99%

Behavioural Analysis of Internal Mechanism of Nonlinear Distortion in OFDM Signal Systems

Lei

O’Dróma

2009

GLOBECOM 2009 - 2009 IEEE Global Telecommunications Conference

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The IMP distortion occurring with the amplification of OFDM signals through a nonlinear RF power amplifier (PA) is analysed with a view to establishing internal relations and impairment significance of different types and combinationscomposition categories-of IMPS. Through this, a novel estimation method was deduced to calculate power spectral densities (PSD) of nonlinear distortion. This method also helps expose some PA independent and operating point (OP) independent characteristics of PSD of nonlinear distortion. The simulation and analysis is based on the use of an IEEE 802.11a OFDM signal and a nonlinear PA model is derived from envelope characteristic measurements of an X-band and S-band GaN power amplifier.

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