In this paper, a comparison is made between the spectral regrowth of quadrature phase shift keyed (QPSK) and offset QPSK (OQPSK) signals as they go through non-linear amplifications. Contrary to existing approaches that assume the power amplifier input is Gaussian, our analysis is carried out without the Gaussian assumption, by using higher-order statistics. We show that it is possible to asses...

We demonstrate 3-Gb/s wireless link using a 60-GHz receiver front-end fabricated in 0.25-μm SiGe:C bipolar complementary metal oxide semiconductor (BiCMOS) and a mixed-mode quadrature phase-shift keying (QPSK) demodulator fabricated in 60-nm CMOS. The 60-GHz receiver consists of a low-noise amplifier and a downconversion mixer. It has the peak conversion gain of 16 dB at 62 GHz and the 3-dB int...

We demonstrate silicon-organic hybrid (SOH) electro-optic modulators that enable quadrature phase-shift keying (QPSK) and 16-state quadrature amplitude modulation (16QAM) with high signal quality and record-low energy consumption. SOH integration combines highly efficient electro-optic organic materials with conventional silicon-on-insulator (SOI) slot waveguides, and allows to overcome the int...

Various digital modulation techniques have been extensively studied and have found numerous applications in wireless communication systems. One example of this success is the QPSK modulation used in the third generation Universal Mobile Telecommunication System (UMTS). This paper presents a new modulation method that produces less adjacent channel interference (ACI) and lower bit error rate (BE...

Wimax is Wireless Interoperability for Microwave Access for Wireless Communication IEEE 802. 16e. In this paper the performance of different modulation techniques (QAM, adaptive and QPSK) by using different mobility patterns for VOD over Wimax with the help of VOD SVC coding. The work is done in terms of throughput, traffic sent and traffic received using OPNET modeler 14. 5. Simulation shows t...

In this paper, we present performance of pilot based channel estimation techniques such as Least Squares (LS) and Linear Minimum Mean Square Error (LMMSE) for different interpolation methods and modulation schemes. The performance is evaluated using the mean squared error (MSE) as the performance metric of interest for downlink LTE system. Simulation results show that for low SNR environment, a...

Multi-band orthogonal frequency-division multipleaccess (MB-OFDM) is one of the UWB technologies that realize wireless personal network (WPAN). In this paper, we experimentally investigated the interference from MBOFDM signal to narrowband QPSK digital transmission system. The bit error rate (BER) performance of the narrowband QPSK system under the interference of UWB signal was evaluated, assu...

Simultaneous measurements with 10-MHz bandwidth at 2.5 GHz, 3.5 GHz and 5.8 GHz were performed in a rural/semi-rural environment in the UK. The data were processed to generate the time variant frequency transfer function, which was subsequently used in a WiMAX channel simulator designed and implemented in SIMULINK for the purposes of the study. Estimates of BER for the 256 carrier OFDM IEEE802....

Optical digital-to-analog converters (DACs) are key to overcoming the enormous power consumption caused by slowdown of Moore's Law. In previous work, an optical DAC consisting a signal generator and intensity converter was presented. The generating component integrated into device, but higher level device integration is desirable. An with built-in for 2-bit binary phase-shift keying (BPSK) demo...

In this work we compute the capacities and the pragmatic capacities of militarystandard shaped-o set quadrature phase-shift keying (SOQPSK-MIL) and aeronautical telemetry SOQPSK (SOQPSK-TG). In the pragmatic approach, SOQPSK is treated as a modulation scheme as opposed to an encoder, and no iterations are performed between the SOQPSK demodulator and the outer binary decoder. We also evaluate th...