诺基亚rf培训.pdf

83080 Receiver Architectures and Synchronization
in munications
Practical RF Architectures for GSM
and WCDMA Mobile Terminals
1 © NOKIA / / Mikko Pesola
Mobile Generations
• 1st generation systems, analog
• NMT, AMPS, TACS
• 2nd generation systems, digital
• GSM, IS-136 TDMA, IS-95 CDMA, PDC
• 3rd generation systems, digital wide band
• WCDMA standards have been prepared by ETSI (Europe), ARIB (Japan),
TIA (USA),...
• 3GPP1 is a joint project bines all proposals into one standard
• Harmonized standard includes three modes
• Direct sequence mode based on 3GPP (UTRA2/FDD)
• Multi carrier mode based on CDMA2000 (USA proposal)
• TDD mode based on 3GPP (UTRA/TDD)
1) 3GPP = 3rd Generation Partnership Project
2) UTRA = Universal Terrestrial Radio Access
2 © NOKIA / / Mikko Pesola
Main Drivers for RF Architecture Design
• Cost, Size, Power consumption
• plexity, time to market
500
450
Component count in GSM RF
400
350
300
250
200
150
100
50
0
1994 1996 1998 2000
3 © NOKIA / / Mikko Pesola
Design Process - time to market
RF-,RF-, A/ASIC A/ASIC Design Design
DSP, MCU SW
Applications DSP, MCU SW
Applications designdesign
ReqReq Spec's Spec's SystemSystem Design Design D/ASICD/ASIC Design Design IntegrationIntegration MfgMfg ramp-up ramp-up
HW,HW, PCB, PCB,
ConceptsConcepts
pkgpkg
. Design Design
Critical Interface:
from system design to Critical Interface:
detailed design from detailed design
to integration
4 © NOKIA / / Mikko Pesola
GSM Specifications for Receiver
• Bad frame indication performance
• Sensitivity
• Usable receiver input level range
• Co - channel rejection
• Adjacent channel rejection (selectivity)
• Intermodulation rejection
• Blocking and spurious response
• AM suppression
5 © NOKIA / / Mikko Pesola
Example of sensitivity speci