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The quiet SDR revolution

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nasdy
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re: The quiet SDR revolution
nasdy   3/9/2009 6:05:40 AM
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nasdy
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re: The quiet SDR revolution
nasdy   3/9/2009 6:04:37 AM
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martinm_de
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re: The quiet SDR revolution
martinm_de   3/4/2009 9:41:58 AM
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Why not make things simple: SDR is meant to be configurable via a change in software to adapt to different wireless standards: my GSM phone in Europe could be adapted to the Japanese standard by simply downloading some piece of software. Hardware like a fractional PLL and the mixer to downconvert the signal to the IF, the ADC to convert the analog to digital can easily be re-configured by software. Hardware like viterbi decoder and other stuff which follows in the signal behind the ADC chain may be harder (if impossible) to re-configure via software to implement completely different decoding schemes for different wireless standards: the processing power needed is so huge that power consumption requirements imply a need for ADICs to bring power down. One could think about re-configurable FPGAs to implement digital signal procesing algorithms using less power than the 'obvious' DSPs. All in all, software defined radio requires lots of efforts by the hardware vendor. And who, finally, benefits from SDR? I think this is the real question. As a consumer of various wireless products, I only see a potential benefit: my computer has a WLAn and a bluetooth interface. I never want to use them simultaneously, so, an SDR could be of use here The amount of money saved here is probably EUR 5. It this really worth it? The mesing around with software, the potential instability, etc?

Lee Pucker
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re: The quiet SDR revolution
Lee Pucker   3/3/2009 11:27:50 PM
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Kenton, I think you are exactly right - the benefits of SDR to date have largely been realized by radio manufacturers, allowing a family of radio ??products? to be implemented using a common platform architecture, allowing new products to be more quickly introduced into the market, and allowing "bug fixes" to occur while a radio is in service, reducing the time and costs associated with operation and maintenance. In the near term, these benefits are being extended to radio service providers, allowing the use of a common radio platform in multiple markets, significantly reducing logistical support and operating expenditures. It also allows new features and capabilities to be added to existing infrastructure without requiring major new capital expenditures, protecting service providers from changes that may occur in wireless standards from time to time and allowing them to quasi-future proof their networks. This evolution will continue overtime, reducing the costs associated with providing end-users access to ubiquitous wireless communications ?? enabling them to communicate with whomever they need, whenever they need to and in whatever manner is appropriate. Fostering this evolution is one of the key roles of the SDR Forum, helping our 108 member organizations to shepherd the migration of the technology from the simple case you present above to the case where most of the signal chain is actually implemented in software. Most systems today, as you say, are somewhere in the middle, but I think everyone will agree that the percentage of software is going up, enabled by breakthroughs in technology and by Moore??s law. Lee Pucker, CEO, The SDR Forum (www.sdrforum.org)

anindya0
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re: The quiet SDR revolution
anindya0   3/3/2009 9:52:18 AM
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Agree with you, a lot of things are seeming to go the SDR way. Please check out the following website of Saankhyalabs which is building a universal demodulator for DTV/ATV platform based on SDR approach. http://www.saankhyalabs.com/index.html

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