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1. Comment - Could an Aussie WiMAX 'disaster' have been prevented?

   (Mar 26, 2008 - 6:35 AM)

   Mobile WiMAX falls short of expectations?
   
   Betanews has reported about the dispute which has erupted over bad WiMax performance based on the report by an Australian WiMAX operator. The report cites of loss of service with direct connectivity beyond 2 Km and inbuilding coverage of only a few hundred meters from the base station.
   WiMAX technology has proved itself in more than 300 trials and a number of commercial launches. Some of the recent ones are the QMAX harbour area WiMAX in Singapore, Wateen telecom in Pakistan, Tata Indicom in India and a number of operators in Latin America.
   
   A network can not defy the laws of physics and the link performances need to be built in. First of all, the higher frequency ranges used in Australia ( nearing the extended c-band at 3.6 GHz are no help as the loss increases with square of frequency as well as distance. Secondly WiMAX base stations come in different versions such as carrier grade, Micro base stations and Pico base stations. These are with different power levels and can not deliver more than their scheduled range.
   http://www.wimax-home.com

2. Comment - Motorola offers sneak peek at DH01 mobile TV

   (Jan 8, 2008 - 6:51 AM)

   LG Unveils Mobile Pedestrian Handheld (MPH™) technology at CES 2008, Las Vegas
   
   LG has unveiled the MPH technology for delivery of TV for handhelds in the United States and other countries using the ATSC standard. This could be one of the most important developments in the field of Mobile TV for North America, which does not have the advantage of DVB-H technology being able to ride on the DVB-T networks being installed currently in many regions of the world including Europe and Asia.
   
   This time, the advantage, however appears to be with the MPH technology as it does not need any additional spectrum. The MPH can enable any device for mobile TV by the use of miniature cards or USB attachments.
   
   This implies that within a year, all mobile devices, such as personal media players, gaming devices or cell phones could be enabled for mobile television programming reception. The reception is possible upto 90 Kilometers per hour, which is a reasonable speed in city conditions.
   
   MPH is based on highly efficient MPEG4 encoding coupled with VSB transmission of mobile TV content. The key advantage of the technology appears to be the use of the existing frequency spectrum used for standard definition or high definition digital television transmissions as well as the existing transmitter infrastructure, with only an additional exciter.
   
   This can turn out to be a major differentiator, as spectrum costs can be very high. Many countries ( such as India, for example) are set upon auctioning the mobile TV licenses based on the fact that it needs to use additional spectrum. The license pricing is essentially the price of the additional 8 MHz spectrum.
   
   The new technology, once in place will create a totally new universe of receiving devices with personal media players (PMPs), gaming devices, Standalone TV mobile receivers coming into vogue.
   
   visit http://ww.mobiletvhome.com/