Oct, 2001 : Study Says CDMA Systems Won't Meet Customer Expectations
📅 - The member companies of the Broadband Wireless Internet Forum (bwif.org) announced the results of a comparison study regarding adapting current 3-G technologies based on Code Division Multiple Access as a possible alternative transmission system for delivering fixed wireless high-speed broadband services.
The results published yesterday in a White Paper titled "BWIF: BringingBroadband Wireless Access Indoors" conclude that the trade-offs in qualitywould be unacceptable to consumers and too expensive for service providers.
Current 3-G systems developed for mobile applications deliver Quality ofService acceptable in the mobile environment for consumers. But consumershave much higher expectations surrounding Internet access, streaming audioand video and other high-rate data services. Customers using existingwire-based access systems, such as DSL, cable and fiber, will not accept theslower data rates that CDMA-systems would deliver in a fixed wirelessenvironment.
The costs for providing a 3-G fixed wireless system would also beunacceptable to service providers, the White Paper explains. The principalreason for this is the necessity to construct many additional base stationsto deliver CDMA- type services in a fixed wireless system. For example, TheChicago metropolitan area would need 15 base stations to provide fixedwireless broadband service using technologies such as Vector OrthogonalFrequency Division Multiplexing (VOFDM). In contrast, CDMA-type 3-G systemswould require 1208 base stations to cover the same geographic area.
In addition, more spectrum is needed to deliver CDMA-type services in afixed wireless system. The CDMA-type 3G systems use omni-directionalantennas, as contrasted with VOFDM systems that use directional antennas. Asmuch as six times more spectrum may be needed to deliver the same level ofservice. The current high cost of spectrum is a significant bar to adoptingsuch technologies.
The authors acknowledge carrier concerns regarding the higher cost ofrooftop antennas, as compared to the portable self-install antennas that areproposed for CDMA-type service. An alternative solution is a self-install,under-the- eaves antenna that would reduce or eliminate truck rolls, butstill keep infrastructure costs manageable.
The White Paper was developed with input from the member companies of BWIFand went through numerous review stages. It is based on both publishedresearch and laboratory simulations. The paper concludes that VOFDM, aspecification supported by BWIF, offers a superior technology for deliveringnonline-of-sight broadband services.
Also published today as a companion White Paper is a related study titled"Frequency Division Duplexing and Time Division Duplexing for BroadbandWireless Applications. Copies of both White Papers are available fordownload at the BWIF website.
The results published yesterday in a White Paper titled "BWIF: BringingBroadband Wireless Access Indoors" conclude that the trade-offs in qualitywould be unacceptable to consumers and too expensive for service providers.
Current 3-G systems developed for mobile applications deliver Quality ofService acceptable in the mobile environment for consumers. But consumershave much higher expectations surrounding Internet access, streaming audioand video and other high-rate data services. Customers using existingwire-based access systems, such as DSL, cable and fiber, will not accept theslower data rates that CDMA-systems would deliver in a fixed wirelessenvironment.
The costs for providing a 3-G fixed wireless system would also beunacceptable to service providers, the White Paper explains. The principalreason for this is the necessity to construct many additional base stationsto deliver CDMA- type services in a fixed wireless system. For example, TheChicago metropolitan area would need 15 base stations to provide fixedwireless broadband service using technologies such as Vector OrthogonalFrequency Division Multiplexing (VOFDM). In contrast, CDMA-type 3-G systemswould require 1208 base stations to cover the same geographic area.
In addition, more spectrum is needed to deliver CDMA-type services in afixed wireless system. The CDMA-type 3G systems use omni-directionalantennas, as contrasted with VOFDM systems that use directional antennas. Asmuch as six times more spectrum may be needed to deliver the same level ofservice. The current high cost of spectrum is a significant bar to adoptingsuch technologies.
The authors acknowledge carrier concerns regarding the higher cost ofrooftop antennas, as compared to the portable self-install antennas that areproposed for CDMA-type service. An alternative solution is a self-install,under-the- eaves antenna that would reduce or eliminate truck rolls, butstill keep infrastructure costs manageable.
The White Paper was developed with input from the member companies of BWIFand went through numerous review stages. It is based on both publishedresearch and laboratory simulations. The paper concludes that VOFDM, aspecification supported by BWIF, offers a superior technology for deliveringnonline-of-sight broadband services.
Also published today as a companion White Paper is a related study titled"Frequency Division Duplexing and Time Division Duplexing for BroadbandWireless Applications. Copies of both White Papers are available fordownload at the BWIF website.
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