The design and calibration of the cross-correlator are crucial issues for interferometric imaging systems. In this paper, an analog complex cross-correlator with output DC offsets and amplitudes calibration capability is proposed for interferometric passive millimeter-wave security sensing applications. By employing digital potentiometers in the low frequency amplification circuits of the corre...

A self-correcting quadrature voltage controlled oscillator (QVCO) with phase correcting loop is proposed. It comprises the QVCO core and phase correcting loop, which corrects the quadrature phase error. Two LC VCOs, buffers, and phase shifters are coupled in circular configuration to achieve IQ symmetry. This paper introduces the idea of realizing QVCO with low phase noise and accurate quadratu...

This paper presents the design of a new error compensation model for providing QoS support on a wireless network. The compensation model uses different compensation strategies for the different priority classes in conjunction with a Multiclass Priority Fair Queuing (MPFQ) algorithm. Criteria for fair error compensation and a classification of error compensation models are established in order t...

A new constant envelope modulation scheme and architecture for QPSK by cubic spline interpolation methods which increase spectral efficiency and power efficiency, named FQPSK-L, is presented. This modulation technique is an extension of the Feher Quadrature Shift Keying (FQPSK) patented technologies, see Ref [1]. Being a constant envelope modulation, FQPSK-L can operate with class C power ampli...

We present a novel investigation on the enhancement of phase noise in coherent optical transmission system due to electronic chromatic dispersion compensation. Two types of equalizers, including a time domain fiber dispersion finite impulse response (FD-FIR) filter and a frequency domain blind look-up (BLU) filter are applied to mitigate the chromatic dispersion in a 112-Gbit/s polarization div...

In this paper we set out to understand Filon-type quadrature of highly-oscillating integrals of the form ∫ 1 0 f (x)e iωg(x)dx , where g is a real-valued function and ω 1. Employing ad hoc analysis, as well as perturbation theory, we demonstrate that for most functions g of interest the moments behave asymptotically according to a specific model that allows for an optimal choice of quadrature n...

Use of Quadrature Bandpass Sampling (QBPS) in GNSS receivers gives several advantages over quadrature-sampled superheterodyne architectures. The sampling process has the important secondary function of providing frequency down-conversion (exploiting aliasing) that avoids the use of frontend RF mixers and oscillators. However, the process is not perfect and does incur some losses. This paper exa...

We consider multivariate integration in the weighted spaces of functions with mixed first derivatives bounded in Lp norms and the weighted coefficients introduced via `q norms, where p, q ∈ [1,∞]. The integration domain may be bounded or unbounded. The worst-case error and randomized error are investigated for quasi-Monte Carlo quadrature rules. For the worst-case setting the quadrature rule us...