Novel Modeling and Calibration Approach for Multiport Receivers Mitigating System Imperfections and Hardware Impairments

Hasan, Abul; Helaoui, Mohamed

doi:10.1109/tmtt.2012.2201742

Cited by 47 publications

(43 citation statements)

References 31 publications

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“…Therefore, a modified architecture of a six-port receiver was proposed in [27], [28] for broadband receiver applications. constants for one known sample can be used with other samples as well.…”

Section: Multiport Wideband Receiver Calibration and Impairment MImentioning

confidence: 99%

“…One can reduce the effect of noise by using a known training sequence with a set of different samples for the purpose of calibration [28], [29]. The coefficients can then be estimated using a calibration algorithm based on least square estimation.…”

Section: Multiport Wideband Receiver Calibration and Impairment MImentioning

confidence: 99%

“…The expression of this model is given in (12) [28], [31]. The calibration and linearization of the six-port receiver can then be done in two steps:…”

Section: B Post-compensation Of Power Detectorsmentioning

confidence: 99%

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Multiport Technology: The New Rise of an Old Concept

et al. 2014

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Abstract-A short review of the multiport (six-port) theory for modern applications in downconversion, direct demodulation or modulation of RF signals, and new measurement techniques for localization is presented in this paper. More than four decades ago, the circuit was developed for low-cost S-parameter measurements of microwave circuits. The modifications required to transform original six-port instrument function to radio function was not obvious in the beginning. In this purpose, several innovations have been implemented during the last two decades. Implementations of the circuit in various mature fabrication technologies, covering frequencies from microwave to millimeter wave spectrum, are presented and discussed. Multiport receiver calibration and impairment mitigation techniques are also proposed at frequencies where analog-to-digital converters and digital signal processing are available.

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Section: Multiport Wideband Receiver Calibration and Impairment MImentioning

confidence: 99%

Section: Multiport Wideband Receiver Calibration and Impairment MImentioning

confidence: 99%

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Multiport Technology: The New Rise of an Old Concept

et al. 2014

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“…The phasor of the RF signal is written as in terms of its in-phase and quadrature components. For linear modeling and calibration of the SPR system, the four equations in (1) can rearranged and written for the estimated in-phase and quadrature components of the received signal as in (2) [14] (2)…”

Section: Linear and Nonlinear Calibrationmentioning

confidence: 99%

“…Though SPR is an extension of the six-port reflectometer concept, there is a lack of robust nonlinear calibration procedure suitable for six-port based receivers operating in real working environment with real communication signals. The reported literature [10]- [13] follows a computationally less involved linear calibration approach described in Section II of this paper that does not take into account all the known impairments and circuit imperfections, while other approach [14] that accounts for these impairments involves computationally complex calibration approach. In this paper, we propose an automatic nonlinear calibration method suitable for six-port based receiver systems that does not require any connection/disconnection of physical loads to the RF port of the receiver for nonlinear calibration.…”

Section: Introductionmentioning

confidence: 99%

Effort-Reduced Calibration of Six-Port Based Receivers for CR/SDR Applications

Hasan

Helaoui

2013

IEEE J. Emerg. Sel. Topics Circuits Syst.

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This paper presents an effort-reduced approach for calibrating the reconfigurable six-port based receiver (SPR) systems for cognitive radio/software defined radio applications that accounts for all the known imperfections and impairments of an SPR system. The state-of-the-art calibration method requires estimation of more than 100 calibration parameters on-the-fly. The proposed calibration method reduces the number of parameters to four without any sacrifice in the overall system performance. The proposed method uses a different structure for six-port junction to ease the calibration effort. The nonlinearity and the frequency response of the system are broken down into two different realms. Nonlinearity of the system is accounted for by continuous wave characterization of the diode detectors while the frequency response is compensated for using an equalizer in the calibration step. The results obtained for the proposed approach are compared with the state-of-the-art calibration method. Similar performance from the SPR system is obtained with much reduced calibration complexity.Index Terms-Calibration, cognitive radio (CR), diode linearization, direct conversion receiver, memory effect, multiport, software-defined radio (SDR).

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Augmented Hammerstein model for the calibration of six-port based dual band wireless receivers

Chagtmi

Boulejfen

Zhang

et al. 2018

Int J RF Microw Comput Aided Eng

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Two architectures of concurrent dual‐band six‐port‐based receiver (SPR), which are modeled and calibrated using the augmented Hammerstein model (AHM) are proposed for the first time in this article. The receivers are based on six‐port junctions with one or two local oscillators (LO). The proposed single step calibration algorithms achieve the recovery of the two in‐phase (I1 and I2) and quadrature (Q1 and Q2) components of an RF signal with two frequency components (RF1 and RF2). Experimental validations have been performed to verify the performance of the proposed concurrent dual‐band receivers and to test the efficiency of the AHM based calibration algorithms. As a performance metric, the Error Vector Magnitude (EVM) has been measured to compare the transmitted and recovered baseband signals and to evaluate the performance and efficiency of the proposed calibration algorithms for the two receiver topologies. The IQ data has been recovered with EVMs no higher than 2% for the two LOs based receiver excited with a QAM modulated dual‐band RF signal. The single LO based receiver has been tested with a dual‐band LTE signal and the recovered IQ data exhibited EVMs no higher than 4%.

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Novel Modeling and Calibration Approach for Multiport Receivers Mitigating System Imperfections and Hardware Impairments

Cited by 47 publications

References 31 publications

Multiport Technology: The New Rise of an Old Concept

Multiport Technology: The New Rise of an Old Concept

Effort-Reduced Calibration of Six-Port Based Receivers for CR/SDR Applications

Augmented Hammerstein model for the calibration of six-port based dual band wireless receivers

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