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Technology Stocks : The New Qualcomm - a S&P500 company -- Ignore unavailable to you. Want to Upgrade?

To: slacker711 who wrote (1896)	9/24/1999 12:34:00 PM
From: engineer	Read Replies (2) \| Respond to of 13582

EVRC is an enhanced version of the vocoder that is already in the MSM chip set. What it does is allow nearly the same voice quality as you get with the 13 k bps vocoder at the 8 kbps vocoding bit rate. This in turn adds capacity to the system. For those of you short on history, originally Klein set out that the capacity gains would be 20-30x over analog. His original assumptions were that we would use 8k bps vocoding, be allowed to produce the same (inferior) voice quality as AMPS, and have the same CDMA system we envision today. When the carriers heard the 13k bps vocoder and with the better error rate a voice quality like wireline, they refused to settle for anything less and thus the bar was raised (or capacity lowered) to 10x AMPS with wireline QOS. EVRC is taking advantage of the fact that DSP processing power has increased by a factor of 8 since the original MSM series was designed and can therefore afford more processing power to increase the coding on the signal or decrease the bandwidth. The system upgrades to do this were minimal, as it involved firmware in the already included vocoder DSP in the MSM and a new vocoder chip in the basestation (which is reused by all call channels on an assignment basis, so the cost is shared). The improvement is to take the 10x system and increase it to a 12-18x system. One technology note to follow here is that as the DSP power of the world goes up, the source coding of signals can increase and the overall bit rate of the information can go down. ( someone wrote this about Shannons laws this last week, but I can't remember who since I read over 1000 posts in 2 days upon return from vacation). In so far as places where the increase can be applied without major changes to the system architecture, these will be implemented as time goes on. Overall system changes, such as the WCDMA types proposed awhile back cannot take place without alot of cost and downtime on an already functioning network. This is why displacement technologies to CDMA will be longer in coming that some infer on this thread, while smaller replacement technologies such as EVRC will take place regularly to improve upon the system design. EVRC was a REQUIREMENT by the japanese (hence MSM2310). Take care....and it is good to be back from the Europe craziness.....