On the Performance of OFDM in Zero-IF Receivers Impaired by Tx Leakage

Frotzscher, Andreas; Krondorf, M.; Fettweis, Gerhard

doi:10.1109/icc.2009.5199264

Cited by 4 publications

(4 citation statements)

References 4 publications

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“…At high TxL SIR γ TxL , the energy of the neglected channel taps reduces the maximal achievable compensation gain. However, because the TxL estimation must operate in a very noisy environment , neglecting the last TxL channel taps is beneficial in two ways: the computational complexity is reduced and the compensation gain increases.…”

Section: Numerical Resultsmentioning

confidence: 99%

“…As shown in and , the TxL interference b ̌ ( t ) has twice the UL signal bandwidth, and its power spectral density (PSD) depends on the transmission scheme (i.e. single carrier or multiple carrier).…”

Section: Transmitter Leakage Impact On the Analog‐to‐digital Conversionmentioning

confidence: 99%

“…However, the design of a frequency agile analog frontend complicates the fulfilment of these requirements. Therefore, the duplexers Tx–Rx isolation can become insufficient, and thus, a significant part of the transmit signal leaks into the Rx chain and can deteriorate severely the demodulation of the received signal . Because the zero‐infrared (zero‐IF) receiver architecture offers various advantages for the design of a frequency agile analog frontend , the present work focuses on transmitter leakage (TxL) in this Rx architecture.…”

Section: Introductionmentioning

confidence: 99%

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Digital compensation of transmitter leakage in FDD zero‐IF receivers

Frotzscher

Fettweis

2011

Trans. Emerg. Telecomms. Techs.

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Transmitter leakage (TxL) has a significant impact on the performance of frequency division duplex devices using zero‐IF receivers and thus requires a suitable compensation. In contrast to analog approaches, digital TxL compensation approaches can easily be reconfigured and therefore are highly attractive for multiband mobile devices. In this contribution, we present a system model, describing the TxL impact on the received digital baseband signal. Furthermore, we show analytically that TxL causes an additional, irreversible signal‐to‐noise loss due to the quantisation in the analog‐to‐digital converter, which limits the applicability of a digital TxL compensation. However, this signal‐to‐noise ratio loss remains negligibly small as long as the TxL interference does not exceed significantly the desired received signal. For TxL to be compensated digitally, the TxL channel needs be estimated. In this work, we present two TxL channel estimation approaches suitable for frequency flat and frequency selective channels. It is shown that the usage of these approaches mitigates effectively the TxL impact on the system performance. Thus, the system designer can allow much stronger TxL, which significantly relaxes the requirements on the transmitter–receiver isolation of the duplexer and the linearity of the analog receiver frontend. Copyright © 2011 John Wiley & Sons, Ltd.

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Section: Numerical Resultsmentioning

confidence: 99%

Section: Transmitter Leakage Impact On the Analog‐to‐digital Conversionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Digital compensation of transmitter leakage in FDD zero‐IF receivers

Frotzscher

Fettweis

2011

Trans. Emerg. Telecomms. Techs.

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“…1. In [11] [12], A. Frotzscher et al analyzed the impact on system performance in zero-IF receiver impaired by transmitter leakage. In [13], M. Kahrizi et al proposed a digital method to suppress the second-order intermodulation (IM2) of Tx leakage in WCDMA direct-conversion receivers.…”

Section: Introductionmentioning

confidence: 99%

Digital Compensation for Transmitter Leakage in Non-Contiguous Carrier Aggregation Applications With FPGA Implementation

Cao

Guo

et al. 2015

IEEE Trans. Microwave Theory Techn.

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In this paper, a generalized dual-basis envelope-dependent sideband (GDES) distortion model structure is proposed to compensate the distortion induced by transmitter leakage in concurrent multi-band transceivers with non-contiguous carrier aggregation. This model has a generalized structure that is constructed via first generating a nonlinear basis function that maps the inputs to the target frequency band where the distortion is to be cancelled, and then multiplying with a second basis function that generates envelope-dependent nonlinearities. By combining these two bases, the model keeps in a relatively compact form that can be flexibly implemented in digital circuits such as field programmable gate array (FPGA). Experimental results demonstrated that excellent suppression performance can be achieved with very low implementation complexity by employing the proposed model.

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Least Squares Estimation for the Digital Compensation of Tx Leakage in zero-IF Receivers

Frotzscher

Fettweis

2009

GLOBECOM 2009 - 2009 IEEE Global Telecommunications Conference

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On the Performance of OFDM in Zero-IF Receivers Impaired by Tx Leakage

Cited by 4 publications

References 4 publications

Digital compensation of transmitter leakage in FDD zero‐IF receivers

Digital compensation of transmitter leakage in FDD zero‐IF receivers

Digital Compensation for Transmitter Leakage in Non-Contiguous Carrier Aggregation Applications With FPGA Implementation

Least Squares Estimation for the Digital Compensation of Tx Leakage in zero-IF Receivers

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