Global System for Mobile Communications (GSM) Services and Architecture If your work involves (or is likely to involve) some form of wireless public communications, you are likely to encounter the GSM standards. Initially developed to support a standardized approach to digital cellular communications in Europe, the “Global System for Mobile Communications” (GSM) protocols are … Read more
Basic Principles of OFDM Notes 1. Introduction The basic principle of OFDM is to split a high-rate datastream into a number of lower rate streams that are transmitted simultaneously over a number of subcarriers. Because the symbol duration increases for lower rate parallel subcarriers, the relative amount of dispersion in time caused by multipath delay … Read more
Channel coding Definition A coding technique is described which improves error performance of synchronous data links without sacrificing data rate or requiring more bandwidth. This is achieved by channel coding with expanded sets of multilevel/phase signals in a manner which increases free Euclidean distance. Soft maximum–likelihood (ML) decoding using the Viterbi algorithm is assumed. … Read more