Homodyne Digitally Assisted and Spurious-Free Mixerless Direct Carrier Modulator With High Carrier Leakage Suppression

In this paper, a new method to design a digitally assisted and spurious-free direct carrier mixerless modulator based on the six-port correlator is proposed. The calibration of the modulator based on modified Cartesian memory polynomial (MCMP) is used to linearize and mitigate hardware impairment of the whole system. The modulation and the up conversion are performed by using the variable loads controlled by the differential in-phase and quadrature-phase baseband voltages together with common-mode voltages. The proposed MCMP is able to compensate for nonlinearity, frequency responses, residual carrier leakage, crosstalk between the in-phase and the quadrature-phase data. The proof-of-concept of digitally assisted mixerless modulator is developed and its performance is assessed at 2.6 GHz with modern communication signals. The error vector magnitudes between the input ideal baseband signals and the up-converted radio frequency signals are all between 2% and 4%. The residual carrier leakage, which remains present after imperfect suppression through hardware means, degrades the overall system performance and it can be suppressed completely by means of the proposed memory polynomial model.

[1]  Shaofang Gong,et al.  Carrier leakage suppression and EVM dependence on phase shifting network in six-port modulator , 2012, 2012 International Conference on Microwave and Millimeter Wave Technology (ICMMT).

[2]  C. de la Morena-Álvarez-Palencia,et al.  FOUR-OCTAVE SIX-PORT RECEIVER A N D ITS CAL- IBRATION FOR B R O A D B A N D COMMUNICATIONS A N D SOFTWARE DEFINED RADIOS , 2011 .

[3]  Jong-Won Yu,et al.  DIRECT SIX-PORT MODULATOR USING POLYPHASE NETWORKS , 2011 .

[4]  Mohamed Helaoui,et al.  Performance Driven Six-Port Receiver and Its Advantages over Low-IF Receiver Architecture , 2014, J. Electr. Comput. Eng..

[5]  Amin M. Abbosh,et al.  Direct quadrature phase shift keying modulation using compact wideband six-port networks , 2012 .

[6]  Nai-Chung Kuo,et al.  Novel MMIC Power Amplifier Linearization Utilizing Input Reflected Nonlinearity , 2012, IEEE Transactions on Microwave Theory and Techniques.

[7]  Rashid Mirzavand,et al.  Multilevel outphasing system using six-port modulators and doherty power amplifiers , 2017 .

[8]  Serioja Ovidiu Tatu,et al.  Multiport Technology: The New Rise of an Old Concept , 2014, IEEE Microwave Magazine.

[9]  Tushar Sharma,et al.  Generalized Continuous Class-F Harmonic Tuned Power Amplifiers , 2016, IEEE Microwave and Wireless Components Letters.

[10]  Shaofang Gong,et al.  Differential six-port modulator , 2011 .

[11]  Shaofang Gong,et al.  Differential circuit technique for six-port modulator and demodulator , 2012, 2012 IEEE/MTT-S International Microwave Symposium Digest.

[12]  M.Y.W. Chia,et al.  Direct 16 QAM six-port modulator , 2008 .

[13]  Shaofang Gong,et al.  M-QAM Six-Port Modulator Using Only Binary Baseband Data, Electrical or Optical , 2013, IEEE Transactions on Microwave Theory and Techniques.

[14]  Peter Karlsson,et al.  Six‐port transceiver for 6–9 GHz ultrawideband systems , 2010 .

[15]  Yanyang Zhao,et al.  Multi(Six)-port impulse radio for ultra-wideband , 2006, IEEE Transactions on Microwave Theory and Techniques.

[16]  Shaofang Gong,et al.  A Comparative Study of Single-Ended vs. Differential Six-Port Modulators for Wireless Communications , 2015, IEEE Transactions on Circuits and Systems I: Regular Papers.

[17]  Peter Karlsson,et al.  Direct Carrier Six-Port Modulator Using a Technique to Suppress Carrier Leakage , 2011, IEEE Transactions on Microwave Theory and Techniques.

[18]  Fadhel M. Ghannouchi,et al.  Experimental approach for robust identification of radiofrequency power amplifier behavioural models using polynomial structures , 2010 .

[19]  Jungsang Kim,et al.  Digital predistortion of wideband signals based on power amplifier model with memory , 2001 .

[20]  S. Z. Ibrahim,et al.  QPSK modulation using multi-port device , 2014, 2014 IEEE Symposium on Wireless Technology and Applications (ISWTA).

[21]  Fadhel M. Ghannouchi,et al.  A Methodology for Implementation of High-Efficiency Broadband Power Amplifiers With Second-Harmonic Manipulation , 2016, IEEE Transactions on Circuits and Systems II: Express Briefs.

[22]  F.M. Ghannouchi,et al.  Behavioral modeling and predistortion , 2009, IEEE Microwave Magazine.

[23]  M.Y.-W. Chia,et al.  Performance Analysis of Serial and Parallel Six-Port Modulators , 2008, IEEE Transactions on Microwave Theory and Techniques.

[24]  Renato G. Bosisio,et al.  Effects of hardware imperfection on six-port direct digital receivers calibrated with three and four signal standards , 2006 .

[25]  N. Seman,et al.  Error Vector Magnitude analysis for wideband QPSK and QAM six-port modulator , 2011, 2011 IEEE International RF & Microwave Conference.

[26]  Fadhel M. Ghannouchi,et al.  Novel Calibration Algorithm of Multiport Wideband Receivers Based on Real-Valued Time-Delay Neural Networks , 2016, IEEE Transactions on Microwave Theory and Techniques.

[27]  Franco Giannini,et al.  A novel broadband MMIC vector modulator for V-band applications , 2010 .

[28]  Shaofang Gong,et al.  LO leakage in six-port modulators and demodulators and its suppression techniques , 2012, 2012 IEEE/MTT-S International Microwave Symposium Digest.

[29]  Marco Fiore,et al.  Linearization of RF power amplifiers using an enhanced memory polynomial predistorter , 2012, NORCHIP 2012.

[30]  Renato G. Bosisio,et al.  Direct quadrature phase shift keying modulator using six-port technology , 2005 .

[31]  Shaofang Gong,et al.  Schottky diode as high-speed variable impedance load in six-port modulators , 2011, 2011 IEEE International Conference on Ultra-Wideband (ICUWB).

[32]  Hyung-Sun Lim,et al.  Compact Six-Port Transceiver for Time-Division Duplex Systems , 2007, IEEE Microwave and Wireless Components Letters.

[33]  M. Helaoui,et al.  Novel Modeling and Calibration Approach for Multiport Receivers Mitigating System Imperfections and Hardware Impairments , 2012, IEEE Transactions on Microwave Theory and Techniques.

[34]  C. Hannachi,et al.  Millimeter wave six-port QPSK modulators for high data-rate wireless communications , 2016, 2016 46th European Microwave Conference (EuMC).

[35]  J Östh,et al.  Six-Port Gigabit Demodulator , 2011, IEEE Transactions on Microwave Theory and Techniques.

[36]  Yi Lei,et al.  Integrating baseband-over-fiber and six-port direct modulation for high-speed high-frequency wireless communications , 2016, 2016 IEEE MTT-S International Microwave Symposium (IMS).

[37]  Ke Wu,et al.  A six-port direct digital millimeter wave receiver , 1994, Proceedings of IEEE National Telesystems Conference - NTC '94.

[38]  Slim Boumaiza,et al.  Envelope Memory Polynomial Reformulation for Hardware Optimization of Analog-RF Predistortion , 2015, IEEE Microwave and Wireless Components Letters.

[39]  Xiaotao Guo,et al.  Characterization for Multiharmonic Intermodulation Nonlinearity of RF Power Amplifiers Using a Calibrated Nonlinear Vector Network Analyzer , 2016, IEEE Transactions on Microwave Theory and Techniques.