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Implementation and analysis of QPSK & 16QAM modulator & demodulator
2008 Edition, November 1, 2008 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

In this paper we present a system design that incorporates the functionalities of a digital modulator/demodulator along with controlling features such as symbol generation, filtering, modulation, demodulation, phase and timing recovery for QPSK and 16 QAM...

Design and Performance Analysis for a Binary Driven QAM Transmitter
Volume PP - IEEE - Institute of Electrical and Electronics Engineers, Inc.

This paper analyzes the design and performance of a binary driven 16-QAM and 64-QAM optical transmitters that employ QPSK modulators in tandem. The design establishes the correct coupling ratios required for a proper constellation with equally spaced symbols. The...

Reconfigurable Silicon Photonics Integrated 16-QAM Modulator Driven by Binary Electronics
2016 Edition, Volume 22, November 1, 2016 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

A novel silicon photonics integrated reconfigurable nested Mach-Zehnder interferometer including tunable splitters and four independent phase modulators has been designed and fabricated. The architecture enables the generation of offset-free phase-amplitude...

Design and Characterization of a 77 GHz Six-Port Modulator for an Automobile Radar
2016 Edition, September 1, 2016 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

A quadrature phase shift keying (QPSK) and 16 Quadrature amplitude modulation (16-QAM) modulator based on the six-port technique were designed and simulated at the center frequency of 77 GHz over 10 GHz bandwidth. It is composed of a six-port passive...

Demodulation of RF signal aggregating four non-contiguous frequency carriers
2014 Edition, December 1, 2014 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

This paper demonstrates that it is possible to demodulate a RF signal composed of four aggregated frequency bands by a single demodulator, named "Three Phase Demodulator (TPD)". Measurements results will be analyzed in the case of 4 carriers modulated by two...

Ultimate capacity of a laser diode in transporting multichannel M-QAM signals
1997 Edition, Volume 15, October 1, 1997 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

In this paper, we investigate the ultimate M-ary quadrature amplitude modulated (M-QAM) channel capacity of a laser diode which is limited by the laser clipping induced nonlinear distortions. Our study includes a spectral analysis, a complete system simulation, and an...

1.6-Gb/s 16-Level Superposed APSK Modem with Baseband Signal-Processing Coherent Demodulator
1978 Edition, Volume 26, December 1, 1978 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

A 1.6-Gb/s 16-level superposed APSK modem using a newly developed baseband signal-processing coherent demodulator is described. ln the modulator, the superposing modulation method is adopted in which two QPSK carriers having different levels are superposed so that the combined...

Fully adaptive MODEM up to 1024 QAM for 26 GHz broadband fixed wireless access systems with mesh topology
2004 Edition, January 1, 2004 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

Broadband fixed wireless access (BFWA) systems operating above 17-GHz band are suitable for high-density deployment of high capacity wireless access infrastructure, while the radio link quality can suffer from rain attenuation especially in rainy climatic regions. In order to overcome the...

Optical Radiofrequency Signal Mixing by All-Optical Sampling Based on a Semiconductor Optical Amplifier Mach–Zehnder Interferometer
2013 Edition, Volume 31, December 1, 2013 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

Experimental performances analysis of an optical radiofrequency signal mixer based on a semiconductor optical amplifier Mach-Zehnder Interferometer utilizing an all-optical sampling method is presented. An optical pulse source generating 21-ps width pulses at a repetition rate...

Performance analysis of conventional detection in BFWA systems
2005 Edition, January 1, 2005 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

The systems under study are broadband wireless fixed access (BFWA) systems over multipath fading channels. Conventional detection methods like coherent and non-coherent detection are examined theoretically for both QPSK and 16-QAM modulated BFWA systems in this paper...

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