A digital high-speed cross-correlator (HSCC) has been developed for use in a microwave polarimetry instrument. The HSCC incorporates radiation tolerant circuit design and an ultra-low power CMOS process. In order to meet the very high input data requirement of 500 megasamples per second the correlator architecture was partitioned into different sections, each with its own trade-off requirements...

Optimal digital data detection for a linear Gaussian (fading) channel is considered in the context of the estimator-correlator and recent recursive structures for sequence detection. It is noted that the complexity of the “estimator” (i.e., prediction filter) and “correlator” (i.e., sequence search) can be varied independently. This concept is demonstrated for flat

2 The theory of crossand auto-correlators 3 2.1 Cross correlators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2.2 Autocorrelators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.3 Construction of a cross correlator using the prompt and delay elements of an autocorrelator . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....

A 128-channel digital autocorrelator spectrometer using four 32 channel low power CMOS correlator chips has been built and tested. The CMOS correlator chip uses a 2-bit multiplication algorithm and a full-custom CMOS VLSI design to achieve low DC power consumption. The digital autocorrelator spectrometer has a 20 MHz band width, and the total DC power requirement is 6 Watts.

Results of evaluating the leading order α s corrections to the correlator of tensor currents in pure gluodynamics are presented. These corrections to the parton result for the correlator are not large numerically that allows one to use perturbation theory for the analysis of the resonance spectrum within the sum rules method.

An update is described of a model independent method to determine the hadronic contribution QED running coupling at Zboson mass scale, ∆αHAD(M2 Z ). The major source uncertainty from light quark vector current correlator zero momentum. This substantially reduced using recently improved lattice QCD results for this correlator. result ) = 274.13(0.73) × 10−4