The evaluation of field theoretic correlators at strong couplings is especially interesting in the light of recently discovered string/field theory correspondences. We present a calculation of the stress-tensor correlator in N = 1 SYM theory in 2+1 dimensions. We calculate this object numerically with the method of supersymmetric discrete light-cone quantization (SDLCQ) at large Nc. For small d...

We present analytical next-to-leading order results for the correlator of baryonic currents at the three loop level with one finite mass quark. We obtain the massless and the HQET limit of the correlator from the general formula as particular cases. We also give explicit expressions for the moments of the spectral density. Baryons are an important source of information on QCD interactions. Mass...

This paper presents a single correlator RAKE receiver for direct sequence code division multiple access (DS-CDMA) systems. In conventional RAKE receivers, multiple correlators are used to despread the multipath signals and then to align and combine those signals in a later stage before making a bit decision. The simplified receiver structure presented here uses a single correlator and single co...

In the first memo of this series [1], a number of simulations were performed with the primary goal of quantifying the performance of the proposed WIDAR correlator compared to an ideal correlator operating at the full bandwidth. These simulations demonstrated that the WIDAR correlator yields satisfactory results. It was also stated and demonstrated that the WIDAR correlator could increase the sp...

In ultra-wideband (UWB) channels, the signal energy in the acquisition receiver spreads over correlator outputs due to rich multipaths, making the output of each correlator have only a small portion of the total energy. To enhance the acquisition performance for UWB signals by exploiting the signals spread over a number of correlator outputs, this paper proposes a two-stage acquisition scheme. ...

We study on the lattice the correlator of heavy-quark currents in the vicinity of vanishing momentum. The renormalized charmed quark mass, the renormalized strong coupling constant and gluon condensate can be defined in terms of the derivatives of that correlator at zero momentum. We analyze quenched Monte-Carlo data on a small lattice 8 ∗ 16 for β = 6. We generalize dispersion relations to the...

Radio interferometric observations are less susceptible to radio frequency interference (RFI) than single dish observations. This is primarily due to : (1) fringe-frequency averaging at the correlator output and (2) bandwidth decorrelation of broadband RFI. Here, we propose a new technique to improve RFI suppression of interferometers by replacing the fringe-frequency averaging process with a d...

The requirement for GPS receivers with low Time To First Fix (TTFF) is increasing with the deployment of new standards like E911. Mean Acquisition Time (MAT) determines the TTFF in GPS receivers. In this paper we analyze a scheme called Sequential Muti-Tap correlator, which reduces MAT by an order of magnitude compared to a serial search correlator, without increasing the hardware significantly...