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2. Wireless device radiation and health - Wikipedia

   en.wikipedia.org/wiki/Wireless_device_radiation...

   Since at least the 1990s, scientists have researched whether the now-ubiquitous radiation associated with mobile phone antennas or cell phone towers is affecting human health. [1] Mobile phone networks use various bands of RF radiation, some of which overlap with the microwave range. Other digital wireless systems, such as data communication ...

3. Direct-sequence spread spectrum - Wikipedia

   en.wikipedia.org/wiki/Direct-sequence_spread...

   v. t. e. In telecommunications, direct-sequence spread spectrum ( DSSS) is a spread-spectrum modulation technique primarily used to reduce overall signal interference. The direct-sequence modulation makes the transmitted signal wider in bandwidth than the information bandwidth. After the despreading or removal of the direct-sequence modulation ...

4. Comparison of wireless data standards - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_wireless...

   Some of these technologies include standards such as ANT UWB, Bluetooth, Zigbee, and Wireless USB . Wireless Sensor Networks (WSN / WSAN) are, generically, networks of low-power, low-cost devices that interconnect wirelessly to collect, exchange, and sometimes act-on data collected from their physical environments - "sensor networks".

5. Comparison of mobile phone standards - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_mobile_phone...

   GSM uses TDMA and FDMA for user and cell separation. UMTS, IS-95 and CDMA-2000 use CDMA. WiMAX and LTE use OFDM . Time-division multiple access (TDMA) provides multiuser access by chopping up the channel into sequential time slices. Each user of the channel takes turns to transmit and receive signals.

6. How to Do a Free Reverse Phone Lookup & the 8 Best ... - AOL

   www.aol.com/finance/free-reverse-phone-lookup-8...

   5. GreatPeopleSearch. GreatPeopleSearch is a user-friendly free reverse phone number lookup site that provides searchers with fast and accurate results. It draws on publicly available national ...

7. List of open-source mobile phones - Wikipedia

   en.wikipedia.org/wiki/List_of_open-source_mobile...

   Distributions for existing phones. KDE Plasma Mobile running on postmarketOS on the Nexus 5. postmarketOS, Ubports, and KDE Neon are open-source distributions running on existing smartphones originally running Android. Maemo Leste is available for Nokia N900 and Motorola Droid 4.