M-QAM Six-Port Modulator Using Only Binary Baseband Data, Electrical or Optical

A new circuit architecture for a direct-carrier six-port modulator is proposed. The proposed architecture uses parallel binary-valued baseband signals to control binary-valued impedance loads for generation of rectangular M-QAM modulation. A theoretical model of the proposed modulator is also derived. A prototype modulator for 64 quadrature amplitude modulation is designed and fabricated for a center frequency of 2.5 GHz for verification of the proposed architecture. The measurements verify the theory and show that good performance can be obtained with the proposed architecture. The proposed modulator does not require any digital-to-analog converter and can operate with both electrical and optical control signals.

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

[2]  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).

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

[4]  D. J. Albares,et al.  Photovoltaic-FET for optoelectronic RF//spl mu/wave switching , 1996 .

[5]  Shaofang Gong,et al.  Data and carrier interleaving in six-port receivers for increased data rate , 2010, 2010 IEEE International Conference on Ultra-Wideband.

[6]  O. Jerphagnon,et al.  Indirect optical control of microwave circuits using monolithic optically variable capacitors , 1999 .

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

[8]  Nazih Khaddaj Mallat,et al.  Millimeter-Wave Ultra-Wideband Six-Port Receiver Using Cross-Polarized Antennas , 2009, EURASIP J. Wirel. Commun. Netw..

[9]  Kwyro Lee,et al.  General design equations of N-way arbitrary power dividers , 2004, 2004 IEEE MTT-S International Microwave Symposium Digest (IEEE Cat. No.04CH37535).

[10]  A Koelpin,et al.  The Six-Port in Modern Society , 2010, IEEE Microwave Magazine.

[11]  J. Iyer.  Photodetectors demystified , 1993, IEEE Potentials.

[12]  R.G. Bosisio,et al.  A new direct millimeter wave six-port receiver , 2001, 2001 IEEE MTT-S International Microwave Sympsoium Digest (Cat. No.01CH37157).

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

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

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

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

[17]  Shaofang Gong,et al.  Diode configurations in six-port receivers with simplified interface to amplifier and filter , 2010, 2010 IEEE International Conference on Ultra-Wideband.

[18]  Qizheng Gu,et al.  RF System Design of Transceivers for Wireless Communications , 2005 .

[19]  E. J. Wilkinson.  An N-Way Hybrid Power Divider , 1960 .

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

[21]  A. Nirmalathas,et al.  Fiber-Wireless Networks and Subsystem Technologies , 2010, Journal of Lightwave Technology.

[22]  Stepan Lucyszyn,et al.  Vector modulator for W-band software radar techniques , 2001 .

[23]  T. Hentschel,et al.  The six-port as a communications receiver , 2005, IEEE Transactions on Microwave Theory and Techniques.

[24]  Shaofang Gong,et al.  Radio architecture for parallel processing of extremely high speed data , 2009, 2009 IEEE International Conference on Ultra-Wideband.

[25]  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).

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