RF engineering is a trade off between: required radio spectrum (bandwidth), speed of data transmission (bit rates) and complexity of implementation. The pulse form used to modulate complex data symbols to the radio carrier frequency is the major element of this story. Over the years several pulse forms and their associated pulse shaping filters have … Read more
Vocoders Human voice is made up of a combination of voiced and unvoiced sounds Vocoders exploit these properties of speech production mechanism Vocoders do not respond to music, non-human sounds and tones from voice band modems PCM vs VOCODERS CDMA VOCODERS 8 kbps variable rate coder Rate 1 Rate 1/2 Rate 1/4 Rate 1/8 Cdma … Read more
LTE is designed to operate in environments where there are peripheral interventions. Link performance degrades as the C/I (i.e. Carrier interference ratio) is reduced, however, it may be acceptable in places with zero or negative C/i. every site and sector LTE systems operating on the same channel so that they can receive interference from all … Read more