Two points are important here: Maximum number of shift register (N) Mask The period of out put sequence is 2N-1 bits Only sequence offset is change when the mask is changed PN stands for Pseudorandom Noise sequence In CDMA system, user information is encrypted by means of scrambling. The scramble code used here is … Read more
Despite a series of low-cost media tablet launches in the second half of 2011, Apple’s iPad has managed to maintain its premier position in the Indian market with 51% market share in 2011. Samsung’s achievement at extending its success in the handset segment to the tablet segment, with its Galaxy Tab, allowed Samsung to occupy … Read more
Apple is reported to be planning to drop support for Google’s mapping service in its next Operating System upgrade, in favour of a mapping service from companies that the company has bought over the past few years. Citing sources at the company, 9to5Mac reported that the company has been combining services from subsidiary companies, … Read more
Deutsche Telekom is reported to have renewed discussions with the USA based regional network, MetroPCS regarding a possible merger with its own T-Mobile USA network. The two companies were last reported to be in talks back in late 2009. Citing two unnamed people familiar with the talks, Deutsche Telekom has been considering a stock-swap transaction and then … Read more
Research In Motion (RIM) today announced that the USA’s Department of Defence has granted approval for the use of BlackBerry 7 smartphones. Working with U.S. Army and Defense Information Systems Agency (DISA) sponsors and partners, BlackBerry 7 smartphones have undergone testing through Army labs leading to a subsequent listing on DISA’s Unified Communications Approved Product … Read more
Nokia says that it has filed claims in the United States and Germany alleging that products from HTC, RIM and Viewsonic infringe a number of its patents. Nokia’s actions include a complaint to the US International Trade Commission (ITC) against HTC, suits against HTC and Viewsonic in the Federal District Court of Delaware, against HTC and RIM in the Regional Court … Read more
MIMO & Cell Traffic in LTE The Tx Div can be applied on all the physical channels: Physical DL Shared Channel (PDSCH) Physical Broadcast Channel (PBCH) Physical Control Format Indicator Channel (PCFICH) Physical Downlink Control Channel (PDCCH) The other MIMO schemes are only applicable to the PDSCH Like the MIMO required a UE-specific feedback (RI … Read more
MIMO-MU = Multi user It is used only in Uplink. MIMO-MU does not increase the individual user’s data rate but it does offer cell capacity gains that are similar to, or better than, those provided by MIMO-SU. The UE does not require the expense and power drain of two transmitters, yet the cell still benefits … Read more
MIMO = Multiple Input Multiple Output 2 or more transmitters and 2 or more receivers. MIMO transmits several streams whereas SIMO or MISO transmits only one stream. If there are N streams, there will be at least N antennas (here only 2). By spatially separating N streams across at least N antennas, N receivers will … Read more
Nokia Siemens Networks says that it has won a LTE contract from Japan’s Softbank Mobile. Softbank Mobile expects to offer LTE services in autumn 2012. Under a separate contract, Nokia Siemens Networks will also expand Softbank Mobile’s HSPA+ network to enable new services using the recently allocated 900 MHz frequency band. Nokia Siemens Networks will … Read more