Search results
Results from the WOW.Com Content Network
A spread-spectrum technique spreads the bandwidth of the data uniformly for the same transmitted power. A spreading code is a pseudo-random code in the time domain that has a narrow ambiguity function in the frequency domain, unlike other narrow pulse codes. In CDMA a locally generated code runs at a much higher rate than the data to be ...
MC-CDMA spreads each user symbol in the frequency domain. That is, each user symbol is carried over multiple parallel subcarriers, but it is phase-shifted (typically 0 or 180 degrees) according to a code value. The code values differ per subcarrier and per user.
OVSF code tree. Orthogonal variable spreading factor (OVSF) is an implementation of code-division multiple access (CDMA) where before each signal is transmitted, the signal is spread over a wide spectrum range through the use of a user's code. Users' codes are carefully chosen to be mutually orthogonal to each other.
cdmaOne network structure. The IS-95 standards describe an air interface, [1] a set of protocols used between mobile units and the network. IS-95 is widely described as a three-layer stack, where L1 corresponds to the physical layer, L2 refers to the Media Access Control (MAC) and Link-Access Control (LAC) sublayers, and L3 to the call-processing state machine.
Download QR code; Print/export ... CDMA frequency bands or frequency ranges are the cellular frequencies designated ... Text is available under the Creative ...
MCC – Mobile Country Code MDN – Mobile Directory Number. ME – Mobile Equipment MEID – Mobile Equipment Identifier MIN – Mobile Identification Number MIP – Mobile IP – See Mobile IP. MMD – Multimedia Domain MMS – Multimedia Messaging Service MN – Mobile Node MNC – Mobile Network Code MN ID – Mobile Node Identifier – See ...
In Russia and some other countries, local carriers received licenses for 450 MHz frequency to provide CDMA mobile coverage area. Many GSM phones support three bands (900/1,800/1,900 MHz or 850/1,800/1,900 MHz) or four bands (850/900/1,800/1,900 MHz), and are usually referred to as tri-band and quad-band phones, or world phones ; with such a ...
Many countries do not use all of their allocated codes, hence the majority of codes are unused. SIDs are assigned to every carrier (e.g., Verizon, Sprint, Alltel) by national regulators or IFAST. SIDs are programmed into the phone when purchased. A phone will maintain a list of "preferred" systems identified by their SID code.