Wideband digital correction of I and Q mismatch in quadrature radio receivers

Pun, Kong-Pang; Franca, J.E.; Azeredo-Leme, C.

doi:10.1109/iscas.2000.857556

Cited by 18 publications

(5 citation statements)

References 9 publications

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“…The magnitude/phase mismatch is not a new problem. It has been wellstudied in communication systems [6,7,8]. However, mismatch compensation schemes developed by communication engineers either assume the magnitude/phase mismatch is a constant value [6,7] or signals of interests are confined in the same Nyquist zone [8].…”

Section: Signal Conversionmentioning

confidence: 99%

“…It has been wellstudied in communication systems [6,7,8]. However, mismatch compensation schemes developed by communication engineers either assume the magnitude/phase mismatch is a constant value [6,7] or signals of interests are confined in the same Nyquist zone [8]. Recently, the author co-developed a new magnitude/phase mismatch compensation scheme designed to compensate frequency-dependent magnitude/phase mismatch over two Nyquist zones [9].…”

Section: Signal Conversionmentioning

confidence: 99%

“…Therefore, the application of complex-valued digital wideband receiver is limited. Although the magnitude and phase imbalance is a common issue in communication systems, due to the facts that wideband receiver does not assume signal frequency and signals to be detected might have very short duration, the imbalance compensation methods developed for communication receiver are not suitable for wideband receiver [6,7,8]. Recently, the author co-developed an algorithm to compensate frequency dependent magnitude/phase mismatch for wideband receiver application [9].…”

Section: Introductionmentioning

confidence: 99%

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Wideband receiver design using frequency-dependent magnitude/phase mismatch

Cheng

2014

IEICE Electron. Express

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We propose a digital wideband receiver scheme covering multiple Nyquist zones by exploiting phase and magnitude mismatch in the conversion from real-valued signals to complex-valued signals. The digital wideband receiver is designed to detect uncooperative signals. The magnitude/phase mismatch due to an imperfect hybrid coupler is often considered undesirable and needs to be compensated. However, by exploiting the frequency-dependent magnitude/phase mismatch phenomenon, we can distinguish signals from different Nyquist zones. Simulation results demonstrate that, using carefully designed magnitude/phase mismatch, we can detect signals over multiple Nyquist zones. The proposed method can lead to a new wideband receiver design.

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Section: Signal Conversionmentioning

confidence: 99%

Section: Signal Conversionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Wideband receiver design using frequency-dependent magnitude/phase mismatch

Cheng

2014

IEICE Electron. Express

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“…Many works focus on mismatch corrections in OFDM systems [3] [4] [5]. A few works incorporate frequency dependent corrections in generalized receiver systems [6] [9], which are indispensible in wideband systems. This work presents state of the art frequency dependent compensation scheme of quadrature mismatches (section II-A) that can be applied in any receiving system (independent of receiving signal type).…”

Section: Introductionmentioning

confidence: 99%

International Journal of Electronics and Telecommunications

Hibner¹,

Zieliński²

2018

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This paper shows effective method of linear distortions compensation in zero-IF receivers. With application of frequency domain processing a computation efficient method was developed that allows to correct quadrature mismatch in Zero-IF receiver along with gain and group delay independent of receiving signal type. Method was implemented and tested on hardware platform confirming its effectiveness. This method makes it possible to build high sensitivity devices to monitor spectrum in very wide frequency ranges.

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“…A number of techniques has been presented for quadrature mismatch compensation based either on external training signals [4] [5] [6] [7] or adaptive techniques with or without external signals [8] [9] [10] [11] [12] [13] achieving ÁÊÊ ¤ ¼ dB. Another technique [14] compensates for RF and IF stages separately.…”

Section: Introductionmentioning

confidence: 99%

A gain/phase mismatch calibration procedure for RF I/Q downconverters

Vitali

Franchi

Gnudi

2005 IEEE International Symposium on Circuits and Systems

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We propose a calibration procedure to compensate for gain and phase mismatch errors in RF I/Q downconversion stages requiring neither external reference signals nor adaptive techniques. The proposed indirect compensation technique is based on the use of the local oscillator (LO) signal as the reference for error measurements. A number of mismatch parameters are first estimated by an algorithm running in the DSP after the analog-to-digital (A/D) converter and then used to correct the downconverted signal digitally during normal operation. A test circuit has been designed in ¼ ½¿ m CMOS technology and it is under fabrication. Circuit simulations exhibit an imagerejection ratio ÁÊÊ ¼ dB for a LO ½± amplitude and ¿ AE phase mismatch.

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Wideband digital correction of I and Q mismatch in quadrature radio receivers

Cited by 18 publications

References 9 publications

Wideband receiver design using frequency-dependent magnitude/phase mismatch

Wideband receiver design using frequency-dependent magnitude/phase mismatch

International Journal of Electronics and Telecommunications

A gain/phase mismatch calibration procedure for RF I/Q downconverters

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