SI
SI
discoversearch

We've detected that you're using an ad content blocking browser plug-in or feature. Ads provide a critical source of revenue to the continued operation of Silicon Investor.  We ask that you disable ad blocking while on Silicon Investor in the best interests of our community.  If you are not using an ad blocker but are still receiving this message, make sure your browser's tracking protection is set to the 'standard' level.
Technology Stocks : Qualcomm Incorporated (QCOM)
QCOM 171.54+0.4%Nov 10 3:59 PM EST
 Public ReplyPrvt ReplyMark as Last ReadFilePrevious 10Next 10PreviousNext  
To: Clarksterh who wrote (121329)7/4/2002 11:44:42 AM
From: Clarksterh  Read Replies (2) of 152472
 
OFDM follow up. I'll correct myself inre Flarion's OFDM and its benefits in a cell system since it turns out that Flarion's technology combines OFDM with spread spectrum technology (freq hopping) so it gets the effects of averaging the users in the neighboring cells just as CDMA does. Still digesting the rest of Flarion's write-up but I will say that outside of Qualcomm this is one of the best technology write-ups I've seen in a long time. Obviously written by someone who really understood the technologies instead of an engineer who is just a mechanic.

flarion.com

BTW - I doubt Flarion's claims that Flash OFDM gets 3 times the capacity of CDMA in a cell system due to keeping orthogonality of the users within a cell. While I agree with the principle I seriously doubt the magnitude. The doubt is primarily because even with multipath the internal to cell interference in a CDMA system is nowhere near the interference from neighboring cells which OFDM is as subject to as CDMA.

BTW2 - Note that while OFDM has advantages in terms of multipath, it has disadvantages when dealing with doppler (i.e. moving vehicles). But how much depends on the bit rate and the speed of the vehicles.

Clark
Report TOU ViolationShare This Post
 Public ReplyPrvt ReplyMark as Last ReadFilePrevious 10Next 10PreviousNext  

HomeMailHotSubjectMarksPeopleMarksKeepersSettings
Terms Of UseContact UsCopyright/IP PolicyPrivacy PolicyAbout UsFAQAdvertise on SI
© 2025 Knight Sac Media.  Data provided by Twelve Data, Alpha Vantage, and CityFALCON News