Here I write about EVDO (HSD) reverse channel in short or summarize defination. The EVDO channels for the reverse connection have a similar structure as for CDMA2000. The reverse link for 1xEV-DO has a structure similar to that for CDMA2000. In EV-DO all signalling is performed on the data channel and this means that there … Read more
A number of channels are transmitted in the forward direction to enable signalling, data and other capabilities to be handled. These channels include the Traffic channel, MAC channel, Control channel and Pilot. These are time division multiplexed. Traffic Channel – This channels uses Quadrature Phase Shift Keying (QPSK) modulation for data rates up to 1.2288 … Read more
The forward link possesses many features that are specific to EV-DO, having been optimised for data transmission, particularly in the downlink direction. Average continuous rates of 600 kbps per sector are possible. This is a six fold increase over CDMA2000 1X and is provided largely by the ability of 1xEV-DO to negotiate increased data rates … Read more
Additional rumors are adding power to the expectations that Apple will finally break out of prison 4 – inch and deliver an iPhone with a resolution close to those offered by its rivals increasingly popular. Apple began with a display of 3.5 – inch, and seemingly reluctantly upgraded to a 4-inch model a couple of … Read more
Mahanagar Telephone Nigam Ltd ( MTNL ) today announced the official launch of free roaming service between Mumbai and Delhi for postpaid and prepaid mobile customers , which will be available on this day ie Republic January 26, 2014 without charge as shared earlier. Union Minister Kapil Sibal Telecom today announced MTNL Roaming Free in … Read more
The government of South Korea is looking to pump as much as $ 1.5 billion in the development of mobile networks based on 5G . Ministry of Science, ICT and Future Plans of the country said it was looking to develop and begin studies 5G service until 2017 , with the expectation that commercial services … Read more
Set of modulation/coding schemes QPSK, 16QAM, 64QAM distributed over one sector: SINR distribution automatic selection mechanisms Maximum throughput per sector Highest modulation scheme Lowest coding protection Mean throughput offered per sector Contribution of different modulations Average over the area AMC is a link adoption (LA) method to adapt the transmission parameters to take advantage of … Read more
QAM symbols are represented by the carrier signal being transmitted with specific phase (90°)/amplitude (dictated by the message), for finite periods of time. QAM constellations (patterns) 2 QAM (Binary PSK – BPSK) Two symbols are defined (1 amplitude; 2 phases) Every symbol transmitted over the transmission channel represents (carries) 1 message bit. Baud rate = … Read more
Data bits modulate (modify) a carrier signal Basic modulation techniques: amplitude frequency phase. Data bits are represented over the transmission channel by SYMBOLS Symbol rate is expressed in Baud (Symbols per Second) Modulation of a carrier is used to transmit data bits efficiently over the air interface The modulation process creates modulation symbols. A modulation … Read more
WiMAX Forum Definition of conformance and interoperability profiles out of the huge amount of options in IEEE 802.16 Interoperability testing and conformance & interoperability certification Definition of conformance and interoperability profiles is still focussing on OFDM 256 More than 380 companies 384 companies (status Nov. 05 / WiMAX Forum) Equipment/System Suppliers, Components Suppliers and Operators … Read more