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Technology Stocks : The *NEW* Frank Coluccio Technology Forum -- Ignore unavailable to you. Want to Upgrade?

To: axial who wrote (10382)	6/24/2005 8:39:33 AM
From: Peter Ecclesine	Read Replies (1) \| Respond to of 46821

Hi, WiMAX best suited for? Exclusively licensed band Point-to-Multipoint dense pack. IEEE 802.16a DC to 11 GHz, TDD and FDD Three base sub-carrier schemes 64-OFDM, 256-OFDM, 2048-OFDMA Three channel widths 6 MHz, 7 MHz, 20 MHz Three modulations QPSK, 16-QAM, 64-QAM Four coding rates 1/2, 2/3, 3/4, 5/6 Four Guard Times 1/32, 1/16, 1/8, 1/4 The WiMAX Forum establishes a profile for licensed use in the 3.4-3.6 GHz ETSI licensed band with 7 MHz channels, and other parameters, and will test accordingly this Summer and Fall. Later profiles for 2.5 GHz and other bands will be established and tested for. For now, the only WiMAX band of record is the 3.4-3.6 GHz licensed band. Compared to 802.11ahj, which has two Guard times, 800 nsec and 1600 nsec, protecting against delay spreads of 400 nsec and 800 nsec respectively, WiMAX has much more NLOS capability, however the 3.4 GHz band is not NLOS. Number of users per channel for WiFi is an issue, but the WiFi Alliance will test for 802.11e this fall, and it has Group Ack, allowing many more bits per second than the current ack every packet. Noone has 200 FDX users at ten miles in a 7 MHz channel. All the carriers have learned to provision and operate WiFi. And so on. You really need to know the difference between WiMAX and IEEE 802.16-2004. You should know the difference between IEEE 802.11-2004 and WiFi. 802.16 with 250 voters and 802.11 with 550 voters are dynamic things, so it is hard to generalize the standards. On licensing, exclusive area licensing is a way to raise money, (e.g. India getting a % of revenues for use of spectrum), and light-licensing is emerging as a quicker (fewer court cases) and cheaper way to reuse spectrum than clearing the 20th century incumbents out to make room for 21st century users. Example is 1710-1755 MHz (S-band) clearing for 3G cellular is estimated to cost $2.5B in the US. Maybe the subsequent auction of 90 MHz will raise $20B, maybe not, but the cost to clear the spectrum is sure. 802.11j is specified for licensed and license-exempt spectrum. Shared. Coexistent. WiMAX does not. Is not. You can download 802.11j at standards.ieee.org When will the WiFi Alliance test for licensed bands? I don't know. But when it does get tested, I will assert that there are no WiMAX TDD bands that WiFi cannot use. The WiMAX FDD bands are a different issue. >>But as the price of WiMax components drops to WiFi equivalence<< What year will that be? WiMAX has significantly higher phase linearity specs. Name the year the power amplifiers will have the same cost. FDD will always be more complicated to provision than TDD. Name the year duplexers are free. petere