Scale Factor Dependencies in Quantum Dipole Coupled Lee-Goldburg Cross-Polarization Experiments
Lee-Goldburg cross polarization is used in many NMR experiments to determine internuclear distances. Distances calculated from frequency peaks in the dipolar coupled dimension are subject to scale factors. Experimentally determined scale factors can differ significantly from the theoreticalyy useful value described in the literature. In this work, simulations using SPINEVOLUTION explore effects of varying experimental parameters of frequency offset and cross polarization powers on $^{15}$N-H systems. Experimental data is used to corroborate the simulation. The scale factor is shown not only to depend on the offset frequency but also the cross polarization powers of the observed nucleus. Scale factors greater than one are shown to be possible in simulated data, though such factors obscure the determination of internuclear distances.
The design of the LTE physical layer (PHY) is heavily influenced by the requirements for high peak transmission rate (100 Mbps DL/50 Mbps UL), spectral efficiency and multiple channel bandwidths (1.25–20 MHz). Unfortunately, the existing WCDMA turbo interleaver does not permit an efficient high throughput implementation. That is why the 3rd Generation Partnership Project (3GPP) has proposed the quadratic polynomial permutation (QPP) interleaver to rectify this situation. In this paper, we will study the performances of QPP interleaver for LTE encoder channel for different configurations of LTE system and we study the effect of LTE channel turbo encoder for the transmission over a wireless multipath channel.