Richard Jhon Conventional Blocking formula and its Analysis for cdma. In AMPS and TDMA systems, voice/traffic channels are assigned to users as long as they are available. Given the required offered traffic, the Erlang B model is used to determine the number of traffic channels required to provide a predetermined grade of service. The Erlang B model … Read more
CDMA means all depedancy on power control here i write on Power Control Inaccuracy in cdma. Traffic capacity of CDMA systems is increased by implementing an appropriate power control scheme to equalize the performance of all subscribers in the system. The appropriate power control scheme reduces the interference to the other adjacent cells. The less … Read more
Sectorization gain can be somewhat of a misleading term. One could think of the sectorization gain as more of a reduction factor. For an omni site, the sectorization gain is one. With a sector site, one could initially try to multiply the resulting capacity of an omni site (or single sector) by the number of … Read more
Intra RAT HO events in LTE Below is the List and How Intra RAT HO events in LTE. Event A1 : Serving becomes better than threshold Event A2 : Serving becomes worse than threshold Event A3 : Neighbor becomes offset better than serving Event A4 : Neighbor becomes better than threshold Event A5 : Serving … Read more
How Handover Filtering by UE in LTE ? If the IE “Filter coefficient” is received the UE applies filtering of the measurements for that measurement quantity according to the formula below. This filtering is performed by the UE before UE event evaluation. The UE filters also the measurements reported in the IE “Measured results”. The … Read more
Although T-Mobile USA is the only major US network not offering Apple’s iPhone, and is seen to be weaker for the lack of it, the company wont follow Sprint Nextel into offering generous sales commitments to get their hands on the smartphone. “Make no mistake about it: We would love to carry the iPhone,” T-Mobile … Read more
There are two ways to transmit training symbols: preamble or pilot tones. Preambles entail sending a certain number of training symbols prior to the user data symbols. In the case of OFDM, one or two preamble OFDM symbols are typical. Pilot tones involve inserting a few known pilot symbols among the subcarriers. Channel estimation in … Read more
The third assumption—that the background noise is Gaussian and uncorrelated with the transmissions—is especially suspect in a cellular MIMO system. All well-designed cellular systems are by nature interference limited: If they were not, it would be possible to increase the spectral efficiency by lowering the frequency reuse or increasing the average loading per cell. In the … Read more
Transmit spatial diversity is a newer phenomenon than receive diversity and has become widely implemented only in the early 2000s. Because the signals sent from different transmit antennas interfere with one another, processing is required at both the transmitter and the receiver in order to achieve diversity while removing or at least attenuating the spatial … Read more
Spatial multiplexing and Receive Diversity in Wimax Spatial multiplexing WiMAX also supports spatial multiplexing, where multiple independent streams are transmitted across multiple antennas. If the receiver also has multiple antennas, the streams can be separated out using space-time processing. Instead of increasing diversity, multiple antennas in this case are used to increase the data rate … Read more