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RU Head: Rinaldo Castello
Danilo Manstretta, Flavio Avanzo, Daniele Mastantuono Flavio Avanzo, Daniele Mastantuono , Daniele Mastantuono
RU Head: Rinaldo Castello
Flavio Avanzo
Research Unit 3
Task 1.4: Advanced RF design
Task 1.4: Advanced RF Design 2/9
Motivation
• Target: next generation cellular – High data rate, adaptive, spectrally efficient modulations
Linear power amplifiers
• Flexible transmitter architectures
Task 1.4: Advanced RF Design 3/9
Wireless Systems Evolution
• Global roaming
• Multi-mode
• Adaptive QoS
• Low Cost
• Small form factor
• Low power
Task 1.4: Advanced RF Design 4/9
3G LongTermEvolution Targets • Significantly increased peak data rates, scaled linearly
according to spectrum allocation – Instantaneous downlink peak data rate of 100Mbit/s in a 20MHz downlink
spectrum (i.e. 5 bit/s/Hz) – Instantaneous uplink peak data rate of 50Mbit/s in a 20MHz uplink spectrum (i.e.
2.5 bit/s/Hz)
• Improved spectrum efficiency – E-UTRA to operate in 1.25, 1.6, 2.5, 5, 10, 15 and 20 MHz allocations…hence
allowing different possibilities for re-farming already in use spectrum
• Low terminal cost and power consumption
• Co-existence – with 3G on adjacent channels – with other wireless systems – Handover with 3GPP – Handover with non 3GPP Technologies (CDMA 2000, WiFi, WiMAX)
Task 1.4: Advanced RF Design 5/9
TX Architectures
• Cartesian I&Q modulation
• Polar Transmitter
• Outphasing Transmitter
Task 1.4: Advanced RF Design 6/9
System Requirements • Why linear amplification is so inefficient?
Task 1.4: Advanced RF Design 7/9
Efficient Power Amplification
Task 1.4: Advanced RF Design 8/9
Efficient Power Amplification
• Issues to be investigated: – Auxiliary power-on – Linearity
Task 1.4: Advanced RF Design 9/9
Research Activity Timetable