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Technology Stocks : Qualcomm Moderated Thread - please read rules before posting -- Ignore unavailable to you. Want to Upgrade?

To: slacker711 who wrote (77348)	5/27/2008 1:54:11 PM
From: Eric L	Read Replies (1) \| Respond to of 197271

DBDM 3G ASICs (Korea) Slacker, Pursuant to your discussion with engineer ... Korea is coming on very strong and rapidly with WCDMA/HSPA at SKT and KTF in the 2.1 GHz IMT-2000 core band and have converted ~25% of Korea's subscriber base from 1xRTT/DO to WCDMA/HSPA. Initial attempts at launching WCDMA/HSPA service in Korea yielded little success and a handful of subscriber in the first 2½ years of buildout. Initially they attempted using DBDM handsets even though QUALCOMM pulled the plug on their 1st announced integrated DBDM ASIC. I had initially assumed that the recent success of WCDMA/HSPA was due to Samsung and LG using a newer QUALCOMM DBDM 3G ASIC. Evidently that is not the case. From what I can ascertain watching this only peripherally, and although Samsung and LG are using QUALCOMM ASICs they are, so far as I know, using strictly SBSM WCDMA/HSPA ASICs, and I don't think either operator has a dual RAN multi-frequency service offer although the RANs share a common billing system. I'm not aware of DBDM ASICs in use anywhere. You probably watch this closer than I do. Does my observation jibe with yours? Engineer might also wish to comment. - Eric -

To: slacker711 who wrote (77348)	5/27/2008 2:28:49 PM
From: engineer	Respond to of 197271

only doing that for power. HSDPA has alot higher power.

To: slacker711 who wrote (77348)	5/27/2008 2:56:42 PM
From: thinkclear	Read Replies (1) \| Respond to of 197271

The main issue with the power amp for the handset is the peak power to average power ratio of the waveform. If the peaks are clipped or compressed the bit error rate increases and the waveform will have out of channel sidebands which have to be filtered out so that they don't interfere with adjacent channels. If the average power and the peak to avg power of the DO waveform and the WCDMA waveform were the same then it would be conceivable to use the same amp. I don't believe this is the case. The bandwidth of the waveform, 1.25 MHz vs. 5MHz is minor due to the miniscule ratio of the waveform bandwidth to the transmit freq. My experience with this ended pre-WCDMA so I can't comment on the actuals measured in the lab. -tc