Performance measurements of four wireless systems (GSM900, GSM1800, UMTS and WLAN) simultaneously transported over an indoor wireless network fed by a low-cost 850-nm vertical-cavity surfaceemitting laser (VCSEL) – 300m length of multimode fibre is presented. The measurement focuses on the error vector magnitude (EVM) performance of the GSM900, GSM1800, and UMTS in co-existence with each other ...

A circuit technique to correct Vdd/PM distortion and improve efficiency as supply modulation of cascode class-E PAs has been proposed. The experimental result shows that the phase distortion can be improved from 20 degrees to 5 degrees. Moreover, a system co-simulation result demonstrated that the EVM can be improved from −17 dB to −19 dB. key words: envelope elimination and restoration (EER), ...

The copolymers of iV-vinylcarbazole/vinyl acetate (V/A) of different compositions were prepared by solution polymerization using AIBN as an initiator. The copolymer composition was determined from quantitative "Cf'H} NMR spectroscopy. Reactivity ratios for the comonomers were calculated using the Kelen-Tudos (KT) and non-linear error in variable (EVM) methods. Two-dimensional heteronuclear sing...

Current paper characterizes the performance of three-radio-frequency-channels, orthogonal-frequency-division-multiplexed (OFDM) radio-over-fiber (RoF) transmission system in terms error-vector-magnitude and received optical signal power for a typical 10 GHz receiver obtained by comprehensive simulations. The impact transmitted OFDM channels' signal-to-noise ratio (SNR) is also considered. We de...

A nonlinear spectral analysis technique that enables digital communication system metrics; SNR, EVM and the waveform quality factor (ρ) to be related to in-band distortion spectrum is presented. System metrics are estimated from the measured output power and in-band distortion power. The estimated metrics are verified by direct measurements of each metric using a Vector Signal Analyzer (VSA) pe...

This document describes the theory of oversampling, the hardware and software implementation on the TMS320C240 and important aspects that need to be considered when using oversampling. The different techniques with their main advantages, limitations and applications are covered in chapter 2. Chapter 3 describes the key implementation blocks that are required to implement oversampling on the TMS...

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