Frequency-domain equalization (FDE) based on the minimum mean square error (MMSE) criterion can replace the conventional rake combining while offering significantly improved bit error rate (BER) performance for the downlink DS-CDMA in a frequency-selective fading channel. However, the presence of residual inter-chip-inference (ICI) after FDE produces orthogonality distortion among the spreading...

Introduction In this contribution, a new off-resonance modulating pre-pulse (OMPP) is applied for bright-iron imaging. The p enables the modulation of the longitudinal magnetization according to the local magnetic field distortion. While ma signal from off-resonant spins, it can especially be applied for cancellation of the MR signal from on-resonant spin enabling direct imaging of off-resonant...

The combination of Multiple Input Multiple Output (MIMO) with Orthogonal Frequency Division Multiplexing (OFDM) is a promising technique for high performance with very high data rates in 4G broadband wireless communications. However, the non-linearities caused by the High Power Amplifier (HPA) degrade the performance of MIMO-OFDM systems. In this paper, we present a theoretical analysis of nonl...

In this study, a technique was developed to compensate for nonlinear distortion through cancelling subcarrier-to-subcarrier intermixing interference (SSII) in an electroabsorption modulator (EAM)-based orthogonal frequency-division multiplexing (OFDM) transmission system. The nonlinear distortion to be compensated for is induced by both EAM nonlinearity and fiber dispersion. Because an OFDM sig...

Second-harmonic control is implemented in a balanced common-emitter configuration to facilitate frequency-independent third-order intermodulation distortion cancellation. Moreover, this circuit configuration facilitates a simultaneous match for either power and linearity or noise and linearity. Experiments demonstrated an improvement of over 15 dB in the output third-order intercept point while...

This paper consist a simulation study of nonlinear distortion (NLD) for radio over fiber (RoF) link. The simulation is performing on OptiSystem platform. The investigation of the nonlinear effect in done by electrical cancellation point, output power, oscilloscope visualizer, types of modulation and laser power etc.

Non-orthogonal multiple access (NOMA) offers a good balance between throughput and fairness for visible light communication (VLC). This work presents a phase pre-distortion method to improve the symbol error rate performance of NOMA uplink with successive interference cancellation (SIC) decoding in VLC. Both theoretical analysis and experimental evaluation have shown that the proposed phase pre...

A system that saves a digital copy of every document that users copy, print, or fax, without asking the user, has recently been proposed. Referred to as the Infinite Memory Multifunction Machine (IM3), this system solves most of the problem of lost documents. However, because of the indiscriminate way it captures data, it is important that users have easy-to-use retrieval tools. Two document an...