A detailed description of a novel algorithm for the 'effective bit' test in noncoherent conditions is presented. This algorithm can offer absolute convergence and has the potential for faster implementation than existing methods. A flow diagram for the algorithm and its implementation using the MATLAB package is included. The metrological reliability of input data is checked. An adopted ZEROIN program and Householder orthogonalization are applied to estimate the starting point of an iterative process, and Newton's method is involved in a final calculation for the best-fit curve to the input data. >

A semi-fixed frequency method for evaluating the effective resolution of A/D converters

The wideband gapfiller satellites will provide near-term continuation and augmentation of the services currently provided by the defense satellite communications system (DSCS) and the global broadcast service (GBS) Ka services currently provided by GBS payloads on UFO satellites. WGS will provide services to the U.S. Department of Defense and other Government users. The Gapfiller satellites will serve as a means to continue and increase the capability of wideband services between the period of approximately 2005 to 2025. This paper presents (1) a review of some of the important features of the WGS system and (2) key design issues for the flexible digital channelizer, which is critical to the routing and switching performed on-board the satellite. The results contained in this submission were generated in whole, or in part, through work supporting the MILSATCOM joint program office (MJPO). The authors are very appreciative of the insight provided by the SMC/MC program office of the Space and Missile Center and Boeing Satellite Systems (BSS) in understanding portions of the wideband gapfiller satellite

Wideband gapfiller satellite (WGS) system

Performance of A/D Converters in Broadband Communication Satellites

A Novel Approach to the Analysis of Non-Uniform Analog-to-Digital Converters for Wideband Communication Sateliite Systems

Analysis and Simulation Results on the Non-uniform Analog-to-Digital Converters Performance for Wideband Communication Satellite Systems

An algorithm to compensate for the effect of signal-source distortion in the measurement of the dynamic performance of analog-to-digital converters (ADCs) is described. The algorithm uses two sets of measurements: one set taken with the function generator and another taken with an all-pass filter inserted between the function generator and the ADC. Simulation results indicate that ADCs with a dynamic range of 60-70 dB can be measured with an absolute accuracy of better than 0.2 dB using a signal generator that has -40 dB distortion components. >

P.A. Setty

Papers

An algorithm to compensate for source spectral impurity in dynamic range measurements (ADCs)