Trying to be nice, and not trying to hold any personal agenda to gain, I question the nature of the information being presented... Is he confusing spectrum related issues to make blame? DVB-H can be considered an option for DVB-T, but this piece leaves me with the distinct impression that not all is understood by the speaker in this case. For example... Sabel will note during his presentation that DVB-H is a modification of Digital Video Broadcast - Terrestrial (DVB-T) for handheld devices but has spectrum allocation issues as many countries are currently using these frequencies for analogue television. The fact that DVB-T is being used in (currently analog) television bands is a matter of choice (and purpose), but the DVB-H service can ride on many different wavelengths (frequencies), as can DMB/DAB (DVB-T can be used in the GHz bands if one wishes, dependent on designed service)... Is it easier to use a different band and bandwidth? Depends! Perhaps, depending on the operator, and dependent on the service, and dependent on the business, and dependent on the licensing issues (to name a few variables)... Perhaps not, depending on the operator, and dependent on the service, and dependent on the business, and dependent on the licensing issues (to name a few variables)... Everyone has an agenda... Manfredi, Albert E wrote: >This article refers to the transmitter power required for >large area coverage of wide band signals, vs the same >wide area coverage of narrow band signals. Even if the >duty cycle is short, as it is in DVB-H, this doesn't >change the propagation characteristics of the signal. >The main advantage of the short duty cycle is to the >receiver's power requirement. > >Of course, they too have their agenda to push. > >Bert > >------------------------------------------------ >RadioScape queries viability of DVB-H for mobile multimedia > >John Walko >(05/16/2005 8:01 AM EDT) >URL: http://www.eetimes.com/showArticle.jhtml?articleID=3D163103709 > >LONDON - Digital radio specialist RadioScape has raised >serious concerns about the technical and commercial >viability of using Digital Video Broadcast-Handheld (DVB-H) >technology for delivering multimedia services to mobile >handsets, suggesting that the alternate Digital Multimedia >Broadcasting (DMB) technology favoured by carriers in the >Far East is superior. Addressing the GSPx Mobile Conference >in Eindhoven, the Netherlands Tuesday (May 17), Les Sabel, >vice president of technology for RadioScape will outline >the results of the trials in Cambridge, England, that he >says show that the design of DMB networks can proceed using >essentially the same rules as for current DAB audio >networks. > >He will stress that DMB, unlike DVB-H, is based on proven >DAB technology with spectrum, transmission towers and >capacity already available for it in most countries. > >Sabel will note during his presentation that DVB-H is a >modification of Digital Video Broadcast - Terrestrial >(DVB-T) for handheld devices but has spectrum allocation >issues as many countries are currently using these >frequencies for analogue television. > >"DMB is viewed by many as the next logical step in the >evolution of DAB," says Sabel. "More importantly, it could >also represent the next step in the evolution of mobile >phones delivering the vision of video and data on the move >that 3G promised but cannot deliver in a cost effective >and efficient manner. A one-to-many broadcast technology, >such as DMB, provides a broadband pipe of multimedia >services that the one-to-one approach of 3G can only >provide in small numbers and expensively." > >Despite the huge impetus building around DVB-H , Sabel >says indications are that for that technology to work >effectively in mobile and indoor environments it will need >to use transmission parameters similar to DAB. This will >eliminate any real capacity advantages and still leave >DVB-H with the issue of transmission power requirements >due to its larger bandwidth. > >"Our field trials show that good DMB reception can be >achieved with existing DAB transmitters that only use low >amounts of power to cover a large footprint," says Sabel. >He adds: "I have yet to see any comparative, quantitative >evidence for DVB-H but, recent discussions indicate that >for DVB-H to achieve the same footprint, network >providers will typically require a five times greater >density of transmitters." > >According to Sabel, this will make DVB-H very expensive to >establish and run - let alone the possibility of public >concerns over yet more transmission towers. "DMB clearly >offers a much better, more cost effective solution for >operators that can be implemented now as it based on >proven DAB technology as can be evidenced by DMB pioneers >in countries such as Korea and China where trial systems >are already up and running." > >He adds that recent studies of the power requirements >suggest that reliable mobile operation is unlikely with >DVB-H unless the network uses QSPK modulation. Coupled >with the propagation issues this throws up, Sabel says a >DVB-H network is likely to need a transmitter density that >is at least five times that of DAB/DMB networks. > >The WorldDAB organization has been enhancing the existing >Eureka 147-based standard, notably adding an outer layer >coding (OLC) scheme. Service based enhancements, such as >Electronic Program Guides, conditional access and >multimedia object transfer have also been added and are >expected to be agreed and standardized within months. > >RadioScape believes that these and the introduction of >Enhanced Stream and Packet modes provide the additional >error protection necessary for the robust delivery of >multimedia content mobile operators are seeking. > >All material on this site Copyright 2005 CMP Media LLC. > > >---------------------------------------------------------------------- >You can UNSUBSCRIBE from the OpenDTV list in two ways: > >- Using the UNSUBSCRIBE command in your user configuration settings at >FreeLists.org > >- By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word >unsubscribe in the subject line. > > > -- Regards, Mark A. 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