How about a 129 tap filter.
Why is DoCoMo using a 4.096Mcps while WCDMA is using a Mcps exactly 1/16 lower, due to an FCC requirement, as I understand it. What will this do to roaming? More of a challenge?
Is it this snip that follows?
What is missing in WCDMA due to the reduction of 1/16?
snip
3) It has been shown in "IMT-2000 CDMA Chip Rate Selection," T1P1 Harmonization Ad Hoc, 98-024, August 19, 1998, Portland, OR, that even with a difficult-to-realize, complex filter, the 4.096 Mcps rate signal does not meet the FCC out of band emission requirement for a 5 MHz deployment. A 129-tap FIR filter was assumed for the WCDMA signal. The cdma2000 signal can meet the FCC requirements by using a 48-tap filter.
snip
BTW, just received my copy of the ERICY annual report. Picture of a RBS 3000 series WCDMA radio base station in production in their new plant in Gavle, Sweden. Unfortunately, it is just a blur, could be a fridge-freezer. |
