IQ-imbalance and DC-offfset compensation in ultrawideband Zero-IF receiver

Rosolowski, Dawid W.; Korpas, Przemysław

doi:10.23919/mikon48703.2020.9253894

Cited by 5 publications

(7 citation statements)

References 7 publications

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“…Such effects as the quadrature imbalance, distortions around the center frequency of the processed channel, and carrier leakage were especially troublesome. They are all known from analogue implementations of IQ modulators and demodulators [3,39]. The above effects and processing linearity had to be corrected to provide proper operation and satisfactory radio performance.…”

Section: Integrated Transceiver Overviewmentioning

confidence: 99%

A Universal Hardware Platform for an LTE-Advanced Base Station Prototyping

Korpas

Rosolowski

Kajczuk³

et al. 2023

Electronics

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This paper presents a universal hardware platform (UHP) based on software defined radio (SDR) technology and developed to accelerate the prototyping and testing new hardware and algorithmic solutions for modern radio systems. There are two integrated transceivers and a baseband processor on the board. Thus, four complete RF transmitting and receiving channels, with observation paths for transmitted signals monitoring could be supported. Our platform can be operated in both time-division (TDD) and frequency-division (FDD) duplex schemes over a 300 MHz to 6 GHz frequency range with simultaneous synthesis and analysis in the bandwidth of up to 100 MHz. The radio system is formed by attaching an appropriate RF front-end to the UHP and uploading standard-specific software. As examples of possible UHP applications, two LTE-Advanced micro base stations for private networks with standard-defined RF front-ends operating in the LTE band B43 (3.6 GHz) with time duplex and the band B31 (450 MHz) in FDD mode are presented.

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Section: Integrated Transceiver Overviewmentioning

confidence: 99%

A Universal Hardware Platform for an LTE-Advanced Base Station Prototyping

Korpas

Rosolowski

Kajczuk³

et al. 2023

Electronics

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“…References [11], [12], [13], [14], [15], and [16] conducted relevant research on IQI calibration based on the training sequence method. A loopback path is required to send a designed training sequence before the useful signal, and then estimate the IQI parameters of the receiver.…”

Section: Introductionmentioning

confidence: 99%

“…The algorithm proposed in this paper belongs to the training sequence method, so the relevant research on the training sequence method is introduced in detail. References [11], [12], [13], [14], [15], [16], [17], and [18] compensated the IQI with a CVC filter. In [11], Deng et al studied transmitter and receiver wideband RF impairments based on the least squares (LS) algorithm.…”

Section: Introductionmentioning

confidence: 99%

A Frequency-Domain I/Q Imbalance Calibration Algorithm for Wideband Direct Conversion Receivers Using Low-Cost Compensator

Peng

Wang

et al. 2023

IEEE Access

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The amplitude and phase imbalances of the in-phase (I) and quadrature (Q) branches inherent in the direct conversion receiver structure cause the generation of image frequency interference signals.In this paper, a frequency-domain I/Q imbalance calibration algorithm is proposed for wideband direct conversion receivers. The I/Q imbalance model is rebuilt by applying the infinitesimal method and FFT algorithm. The mathematical expressions for the exact computation of the I/Q imbalance parameters are derived based on the frequency-domain statistical properties of the baseband signal. The two phase parameters, frequency-dependent I/Q imbalance (FD-IQI) and frequency-independent I/Q imbalance (FI-IQI), are separated according to the parity properties of the imbalance parameter. To avoid the interference from the transmitter, the receiver impairment estimation is performed using a frequency offset (FO) DC training signal, and a low-cost real-valued compensation (RVC) filter is introduced to correct the impairments of the received signal. The performances of the proposed calibration model are evaluated through simulations and experiments. The simulation results show that the image rejection ratio (IRR) is improved to 80-120 dBc and can also exceed 40 dBc at high noise levels. The experimental results based on the CX9261A evaluation board show that the average IRR of the multi-tone signal is increased by 24.99 dB, and the IRR of the wideband signal is increased by 19.08 dB.INDEX TERMS Direct conversion receiver, frequency-dependent I/Q imbalance, frequency-independent I/Q imbalance, frequency-domain statistical properties, infinitesimal method, real-valued compensation filter.

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“…Recently, the pursuit for high throughput wireless data transmission has driven the need for wide bandwidth and high-order modulation schemes in modern communications. The quadrature technique is the best way to implement high-order quadrature amplitude modulation (QAM) scheme, where quadrature hybrid couplers have been widely used to provide signals with the desired 90-degree phase characteristics for the QAM signal generations [1][2][3][4][5][6][7][8]. The main problem of quadrature circuits is the I/Q mismatch, that is, quadrature phase and differential gain errors between the in-phase (I) and quadraturephase (Q) channels.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, the I/Q mismatch calibration method is necessary in high-order modulation systems. Several methods to compensate the I/Q mismatch have been reported, including compensating 90-degree phase characteristics in the digital domain [1][2][3][4], and in the analog domain [5], which need complex phase compensation circuits with increased power consumption. Thus, a compact, low-loss, and low power I/Q phase reconfiguration approach in the RF domain still needs to be explored.…”

Section: Introductionmentioning

confidence: 99%

A Compact 10–14.5 GHz Quadrature Hybrid with Digitally Reconfigurable I/Q Phase in SiGe BiCMOS Process

Chen

Hou

et al. 2022

Electronics

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In this article, the development of a compact 10–14.5 GHz quadrature hybrid with digitally reconfigurable I/Q phase in 130 nm SiGe BiCMOS process is presented. Thanks to the switched capacitance loaded on I/Q path of the quadrature hybrid, the I/Q phase difference can be optimized and digitally reconfigured. The equivalent model is analyzed with even/odd mode theory, and the ABCD matrix is used for the circuit derivation. In order to obtain high coupling coefficient, the broadside coupled line sections are utilized, and compact hybrid size can be realized accordingly. Measured results show that the compact quadrature hybrid has optimized phase difference of 90 ± 1.0° and amplitude difference less than ±0.5 dB for 10–14.5 GHz, with an ultra-compact size of 460 µm × 151 µm, or 0.031λ0 × 0.011λ0. Meanwhile, with the seven reconfigurable phase states, the quadrature hybrid I/Q phase can be digitally reconfigured for a range of 3 degrees to compensate the I/Q phase imbalance in the quadrature system, without DC power consumption.

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IQ-imbalance and DC-offfset compensation in ultrawideband Zero-IF receiver

Cited by 5 publications

References 7 publications

A Universal Hardware Platform for an LTE-Advanced Base Station Prototyping

A Universal Hardware Platform for an LTE-Advanced Base Station Prototyping

A Frequency-Domain I/Q Imbalance Calibration Algorithm for Wideband Direct Conversion Receivers Using Low-Cost Compensator

A Compact 10–14.5 GHz Quadrature Hybrid with Digitally Reconfigurable I/Q Phase in SiGe BiCMOS Process

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