Existing coded caching schemes fail to simultaneously achieve efficient content placement for non-uniform file popularity and efficient content delivery in the presence of common requests, and hence may not achieve desirable average load under a non-uniform, possibly very skewed, popularity distribution. In addition, existing coded caching schemes usually require the splitting of a file into a ...

When is uncoded transmission optimal? This paper derives easy-to-check necessary and suÆcient conditions that do not require nding the rate-distortion and the capacity-cost functions. We consider the symbol-by-symbol communication of discretetime memoryless sources across discrete-time memoryless channels, using single-letter coding and decoding. This is an optimal communication system if and o...

the research was aimed at finding out the effects of the implementation of writing feedback techniques and students’ writing anxiety on students’ writing ablity. experimental method of 3x2 factorial design was employed in the research. there were three experimental groups of students who were taught by using teacher feedback, peer feedback and the combination of peer and teacher feedback writin...

| Convolutionally encoded partial response CPM is studied for an AWGN channel constrained by a narrow spectrum mask which puts hard requirements on both the width of the spectral main lobe and the size of the spectral side lobes. A family of uncoded partial response CPM schemes of diierent complexity based on the GMSK phase pulse are obtained. The schemes with best minimum Euclidean distance ar...

This contribution considers the data-aided (DA) maximum-likelihood carrier phase ambiguity resolution algorithm for coded M-PSK signaling. We derive analytical performance results of the algorithm when operating in the presence of phase estimation errors. As the use of a pilot sequence reduces the spectral efficiency of the system, we determine analytically the minimal pilot sequence length for...