By Siegmund Redl, Matthias Weber, Malcolm W. Oliphant
The main finished reference to be had on GSM purposes and prone, this new identify is meant to construct at the simple technical details within the authors' unique bestseller, An advent to GSM (Artech apartment, 1995). The publication presents a close-up examine this scorching expertise, bargains in-depth discussions of the positive aspects and companies to be had via GSM, and comprises new and extra in-depth insurance of purposes and implementations of the GSM usual. It additionally explains how GSM has succeeded in changing into the foremost electronic instant general - and addresses either prior and destiny standardization, law, and improvement concerns.
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Extra resources for GSM and Personal Communications Handbook
Availability: Even the best technology for a certain application is of no use when it is not available for deployment (network technology) and mass production (terminals) at a scale sufficient to generate revenue for the operator. The GSM case against CDMA is an excellent example. Due to GSM’s 5-year head start and its wide support in the industry with a variety of IPR holders, many systems decisions were made in favor of this technology. Deployment of CDMA cellular service in the United States was postponed several times due to technical problems and the resulting lack of “ripe” network and subscriber equipment.
4 Voice quality High voice quality is achieved through the digital transmission of speech codec (vocoder) data. Sampled voice signals are compressed and error protected. A variety of powerful algorithms have been developed for wireless applications and progress continues on the lower rate possibilities. Though there is plenty of redundancy in the human voice, there is limited freedom in voice coding. The aim is the highest quality at the lowest rate possible. The price we pay for low data rate voice with good quality is complexity, including lots of processor resources (and power The changing scene—again 35 consumption) and memory (cost).
The business user with typically hundreds of air-time minutes per month would rather choose a high fixed monthly rate with a lower per-minute charge. Some private users who would not use the phone much at all (tens of minutes a month) would rather pay a low monthly fee with a higher air-time charge. One other basic figure that underlines the shift in the cellular customer base profile is the worldwide average annual service revenues per subscriber, which are expected to drop from approximately $1,000 in 1995 to less than about $700 during 2000.
GSM and Personal Communications Handbook by Siegmund Redl, Matthias Weber, Malcolm W. Oliphant