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Technology Stocks : The *NEW* Frank Coluccio Technology Forum

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To: Rob S. who wrote (20827)	4/13/2007 3:28:18 AM
From: axial	of 46821

Good stuff, Rob - Your points are well taken. Re: "The power usage of OFDM-enabled portable devices still leaves something to be desired, too." This was a statement about the relative efficiency of OFDM amplifiers compared to amplifiers in other forms of modulation, and the consequences for power usage. I remember discussing this in '99, at which time it was hoped that technological advances would eliminate, or minimize the problem. So far, it hasn't happened. OFDM is still at a relative disadvantage in this respect. Linearity is the problem, and backing off amplifier power is (in part) the solution. As the data rate goes up, the backoff increases to stay in the linear portion of the curve. This is a loss in efficiency, which translates into a comparative increase in power usage for mobile OFDM devices. Definitely not a plus in smaller battery-operated devices. I won't quote the estimates I've seen for comparative battery life in equal-usage scenarios, because I'm not sure how accurate they are. But I'm certain that it's still an issue. To be sure, improvements are being mooted, and things will improve by increments. Jim

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