In this paper, Space Time Block Code (STBC), Spatial Multiplexing (SM) and hybrid model with OFDM are designed for Rayleigh fading channel. Combination of SM and STBC forms hybrid MIMO model. The performances of the above mentioned models with different modulations such as Quadrature Phase Shift Keying (QPSK) and Quadrature Amplitude Modulation (QAM) with multiple antennas are measured with res...

A comprehensive study of the various modulation techniques has been discussed which helps to increase data rate, to overcome dispersion effects and various non-linear effects in the fibre. Modulation formats such as OOK (On Off Keying), BPSK (Binary Phase Shift Keying), DPSK (Differential Phase Shift Keying), DP-QPSK (Dual Polarized Quadrature Phase Shift Keying) and duobinary are studied. The ...

An all-optical radio-over-fiber (RoF) link with double spectral-efficient transmission and compensation of chromatic dispersion-induced power fading is proposed experimentally demonstrated. At the central office, a commercial dual-polarization quadrature phase-shift keying modulator utilized to produce polarization-multiplexed signal composed two modulated microwave vector signals an unmodulate...

The authors present theoretical performance analysis and simulation results for Quadrature-Quadrature Phase Shift Keying (QPSK), Constant Envelope (CE) QPSK, and trelliscoded 16D CEQPSK in ideal bandlimited channels of various bandwidths. The performance of receivers with and without channel estimation is reported. Spectral analysis is presented for each system, in addition to MSK and expanded ...

Application of a spectrally efficient coded modulation technique called Trellis Coded Modulation (TCM) to optical Differential Quadrature Phase Shift Keying (oDQPSK) is discussed. Symbol Error Rate (SER) performance of the resultant system in the presence of Amplified Spontaneous Emission (ASE) noise is evaluated using the Karhunene Loeve Series Expansion (KLSE) method. Optical Signal to Noise ...

A phase-shift keying (PSK) demodulator is demonstrated for the target application of low power and high data rate inductive links. The demodulator based on the single-bit sampling demodulation scheme is capable of operating in binary, quadrature, 8-, and 16-PSK mode. The prototype chip realized in 0.18mm CMOS process can demodulate up to 1.25 MSymbol/s at 5-MHz carrier frequency. It occupies 24...

We demonstrate reconfigurable orbital angular momentum (OAM) and polarization manipulation of OAM- and polarization-multiplexed 100 Gbit/s quadrature phase shift keying (QPSK) data channels. Each data channel's OAM value and its polarization state can be arbitrarily changed by taking advantage of the unique wavefront profile of OAM beams using liquid crystal on silicon-based spatial light modul...

Analogous to multiple-symbol differential detection of quadrature phase-shift keying (QPSK), a multiple-bit differential detection scheme is described for offset QPSK that also exhibits continuous improvement in performance with an increasing observation interval. Being derived from maximum-likelihood (ML) considerations, the proposed scheme is purported to be the most power-efficient scheme fo...

Through numerical modeling, we illustrate the possibility of a new approach to digital signal processing in coherent optical communications based on the application of the so-called inverse scattering transform. Considering without loss of generality a fiber link with normal dispersion and quadrature phase shift keying signal modulation, we demonstrate how an initial information pattern can be ...