China
Africa
Explore chapters and articles related to this topic
Wireless networking
Published in Matthew N. O. Sadiku, Optical and Wireless Communications, 2018
Wireless PBX has its roots in standards developed in Europe and Japan. The following three standards are bidding for attention in the wireless PBX: The cordless telecommunication (CT) series of standards: These are low-cost, public cordless telephone systems that have been popular in Europe. CT has generations 0, 1, 2, and 3 corresponding to CT0, CT1, CT2, and CT3, respectively. CT0/CT1 are for analog cordless telephone. CT2 allows bandwidth splitting into radio channels. CT3 was designed for high-density office environments, using technology to boost capacity in crowded areas. To ensure compatibility with other communication devices, many wireless systems adhere to CT2.The digital enhanced cordless telecommunications (DECT): DECT is a Pan-European standard for digital cordless telephony which operates from 1880 MHz to 1900 MHz.The personal handy-phone system (PHS): PHS is a Japanese standard that uses TDMA/TDD system and occupies the 1895–1918. 1 MHz band. (The spectrum bands for DECT and PHS overlap slightly.)
Can Electromagnetic Field Exposure Caused by Mobile Communication Systems in a Public Environment Be Counted as Dominant?
Published in Marko Markov, Mobile Communications and Public Health, 2018
Jolanta Karpowicz, Dina Šimunić, Krzysztof Gryz
Technical operation of DECT is designed as an FDMA / TDMA system. The frequency band used for the DECT system (e.g., in Europe: 1880–1900 MHz) is divided up into 10 frequency channels, and an additional 24 time slots per every frame of 10 ms are used. On the top of this, DECT applies TDD technology, which uses different time slots for transmission and reception in the same frequency channel. This is why it is possible for DECT to provide 12 duplex speech channels in each frame and 120 carriers, where each of them can support 32 kbit/s. The maximum power for both the base stations and portable unit is 250 mW. This means that the portable unit usually radiates up to 10 mW during the call, since it is using only one out of 24 time slots.
Radio frequency radiation safety
Published in Riadh Habash, BioElectroMagnetics, 2020
The second source of local RFR exposure is cordless phones which are wireless handsets that communicate with a base station connected to a fixed telephone line. Several frequency bands are used in North America, being 900 MHz, 1,900 MHz, 2.4 GHz, and 5.8 GHz. Digital enhanced cordless telecommunications (DECT) phones, which use the 1,900 MHz band, are most commonly used in Europe. DECT phones emit PW emissions to communicate with the base station which can communicate with up to six handsets at a time.
Volterra and Wiener Model Based Temporally and Spatio-Temporally Coupled Nonlinear System Identification: A Synthesized Review
Published in IETE Technical Review, 2021
Saurav Gupta, Ajit Kumar Sahoo, Upendra Kumar Sahoo
There are different ways other than SVD to implement KL method for model reduction. One of the computationally efficient ways is to transform the KL method into eigenvalue/eigenfunction problem of a spatial two-point correlation function [40, 114]. A rigorous mathematical formulation for the identification of nonlinear systems using KL transformation has been reported in [115]. Latter has discussed a real application where the voice communication channel is identified. This channel comprises of a digital enhanced cordless telecommunications (DECT) cordless phone for wireless communications and a telephone line.