This report is a literature survey that investigates the effect of feedback on the capacity region of multiple access channels (MAC) and broadcast channels (BC).

The identification capacity region of the compound broadcast channel is determined under an average error criterion, where sender has no state information. We give single-letter formulas for discrete channels and multiple-input multiple-output Gaussian input constraint. theorems apply to general memoryless channels. This in contrast transmission setting, only known special cases, notably degrad...

nowadays people are seeking health information to raise their awareness. they use many ways to get this information. this study examines the health information channels used by users of public libraries. the population of the present survey  consisted of 461 users of public libraries throughout the country, randomly selected in a two-stage cluster sampling method. the questionnaire data were an...