| S/I |
signal-to-interference ratio |
|
| S/N |
signal-to-noise ratio |
|
| SACCH |
Slow Associated Control Channel |
|
| sampling |
|
The first process performed in the conversion of analog waveforms to a digital format. It converts a continuous- time signal into a discrete-time signal or sequence of numbers. |
| SAT |
Set-up Audio Tone |
An audio tone in the 6 kHz range added to the downlink or forward channel in analog cellular systems. The mobile detects and returns the tone. The SAT tone is used to determine channel continuity, and only one SAT tone is usually assigned to a base station or sector. |
| SCCH |
Signaling Control Channel |
|
| SCH |
Synchronization Channel |
A logical channel used by mobile stations to achieve time synchronization with the network. Used in GSM, cdma2000, and W-CDMA systems. [1] |
| SDCCH |
Slow Dedicated Control Channel |
|
| SDH |
Synchronous Digital Hierarchy |
An international standard for synchronous optical transmission. This standard allows the world-wide connection of digital networks. |
| SDMA |
Space Division Multiple Access |
Also known as multiple beam frequency reuse, this technique employs spot beam antennas to reuse frequencies by pointing the antenna beams using the same frequency in different directions. |
| SFHMA |
Slow Frequency Hopped Multiple Access |
|
| shadow fading |
|
A phenomenon that occurs when a mobile moves behind an obstruction and experiences a significant reduction in signal power. |
| SHF |
Super High Frequency |
|
| Signal Booster |
|
Compensates for loss of effect (weakening of the signal in the co-axial cable) between the outer antenna and the phone. Applies to both incoming and outgoing signals. |
| SIM Card |
Subscriber Identity Module Card |
|
| slow fading |
|
A long term fading effect changing the mean value of the received signal. Slow fading is usually associated with moving away from the transmitter and experiencing the expected reduction in signal strength. |
| SMR |
Specialized Mobile Radio |
|
| SMS |
Short Messaging Service (Service Management System) |
|
| SNR |
Signal-to-Noise Ratio |
|
| spread spectrum |
|
A term used to describe a system that uses spectrum spreading techniques in its operation. |
| SR |
Spread Rate |
Spread rate is also known as the chip rate and is the rate of the digital code used to spread the information. The spreading rate is typically at least 100x the information rate. |
| SS |
Spread Spectrum |
See spread spectrum. |
| SS7 |
Signal System 7 |
|
| SSD |
Shared Secret Data |
|
| STD |
Selective Transmit Diversity |
|
| supplementary services |
|
A group of network layer protocol functions that provide call independent functions for mobile phones. These include: call forwarding, follow-me, advice of charge, reverse charging, etc. |
| Symbian |
|
Owned by Ericsson,
Nokia, Motorola, Panasonic and Psion, Symbian creates
an advanced, open, standard operating system - Symbian
OS - for its licensees. Symbian OS is designed for next-generation
mobile phones and enables a broad, international, developer
community. Phones using Symbian OS include the Ericsson
R380 and Nokia 9210. |
| symmetric |
|
In communications networks, providing the same data rate in
each direction. |
