In this paper, an efficient method for minimizing the high Peak to Average Power Ratio (PAPR), based on Clipping and Differential Scaling, in Orthogonal Frequency Division Multiplexing (OFDM) systems is proposed. In this technique, the amplitude of complex OFDM signal is clipped and then scaled in such a way so that the PAPR is reduced without causing much degradation in Bit Error Rate (BER). C...

In this paper, we concentrate on developing a bi-fuzzy multi objective transportation problem (MOSTP) according to bi-fuzzy expected value method (EVM). In a transportation model, the available discount is normally offered on items/criteria, etc., in the form all unit discount (AUD) or incremental quantity discount (IQD) or combination of these two. Here transportation model is considered with ...

Die Beurteilung eines Projekts oder der Vergleich zweier Projekte ist häufig aufgrund fehlender Normierung der berichteten Projektkennzahlen nur schwer möglich. Zur Erstellung transparenter und nachvollziehbarer Projektberichte wurde eine Anwendung entwickelt, die in Analogie zu einem Armaturenbrett die wichtigsten Projektkennzahlen nach der Earned Value Methode (EVM) anzeigt. Die Verwendung st...

The demand for higher data rates in mobile communications is leading to the use of higher order modulation schemes, such as 8-PSK. In such systems distortion is a consequence of magnitude and phase disturbances. In this work we investigate the performance of an 8-PSK with phase distortion due to Gaussian bandpass noise, through analytical and simulation studies. Results are presented relating E...

A dual band, 5.15GHz-5.35GHz, 2.4GHz-2.5GHz, zeroIF transceiver is fabricated on a 0.18μm CMOS process. The fully integrated synthesizer and VCO achieve an integrated phase error of 0.8 at 5GHz. The transmitter achieves –33dB EVM, while the receiver features a 5.2dB noise figure (NF) at 5.25GHz and 3.5dB NF at 2.45GHz. An architecture including feedback paths enables digital calibration, which ...

This paper reports on a student project performed at the University of Southampton jointly by 4th year MEng students within the course “Advanced Radio Communications”. The aim was to design a software modem capable of transmitting 16kb/s of data, whereby random number generation, advanced modulation, pulse shaping, synchronisation, and error counting techniques had to be applied. The ultimate a...

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...

5G communications require a multi Gb/s data transmission in its small cells. For this purpose millimeter wave (mm-wave) RF signals are the best solutions to be utilized for high speed data transmission. Generation of these high frequency RF signals is challenging in electrical domain therefore photonic generation of these signals is more studied. In this work, a photonic based simple and robust...