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
Advanced Antenna Systems,Transmit diversity and Beamforming in Wimax Advanced Antenna Systems The WiMAX standard provides extensive support for implementing advanced multiantenna solutions to improve system performance. Significant gains in overall system capacity and spectral efficiency can be achieved by deploying the optional advanced antenna systems (AAS) defined in WiMAX. AAS includes support for a variety … Read more
Google is reported to have held preliminary discussions that could lead to it setting up its own wireless network in the USA, according to a report in the Wall Street Journal. The internet giant, which has just started deploying its own landline internet service in the USA has held talks with satellite-TV provider Dish Network, according … Read more
Handover principles and Handover measurements in LTE Handover principles Lossless Packets are forwarded from the source to the target. Network-controlled Target cell is selected by the network, not by the UE. Handover control in E-UTRAN (not in packet core). UE-assisted Measurements are made and reported by the UE to the network. Late path switch Only … Read more
The Surface RT model with the minimum 32 gigabytes of NAND flash memory and an optional black Touch Cover carries a bill of materials (BOM) of $271.00, according to a preliminary estimate from the IHS iSuppli Teardown Analysis Service. When the $13.00 manufacturing expense is added in, the total cost to manufacture the Surface rises … Read more
The Android smartphone operating system was found on three out of every four smartphones shipped during the third quarter of 2012. According to International Data Corporation (IDC), total Android smartphone shipments worldwide reached 136 million units, accounting for 75% of the 181.1 million smartphones shipped in 3Q12. The 91.5% year-over-year growth was nearly double the … Read more