Broadband WirelessCommunication
The world is going wireless !
Wireless Requirements
Long term strategy executed in a phased approach
OFDM Modem Architecture
Improved equalizer for better performance with QAM
Second generation OFDM Modem
Wireless set-up at 5.2 GHz
IMEC’s solution: WLAN-in-a-package
System model includes 4 most important front-end impairments
PA can be operated with only 15 dB back-off (IIP3 - Pin)
Phase noise must be K<-32dBc for a Lorentzian model
Demonstrator: Single-package 5 GHz receiver RF module
Single-package 5 GHz receiver RF module
Co-Design of ASIC and MCM allows optimal trade-offs
Better VCO performance with high-Q MCM passives
4.7 GHz VCO with MCM-D inductors
Complete RF Transceiver in a single package
Next step: from antenna to DC in a single package
Transmitter architecture exploration
Single-package implementation and demonstration
Turbo Decoding Scheme
Turbo coding significantly improves performance
Systematic memory optimiza-tions reduce power consumption
Spatial Division Multiple Access (SDMA)
OFDM / SDMA Architecture with Per-carrier Processing
OFDM/SDMA MultipliesNetwork Capacity
Multimedia home gateway requires a QoS MAC
Wireless Personal Network enables new applications
Multiple Antennas :Scalability of Link Capacity
SC-CP offers OFDM performance with low PAPR
Scalability with Hybrid OFDM
Capacity search : link adaptationto avoid fading margin
Substrate noise coupling is a problem for integrated radio’s
Substrate noise spectral peaks 40 dB larger than noise floor
Applying the analysis to the WLAN OFDM baseband chip
Our Goals
Home Page: http://www.imec.be
Other information: Copyright IMEC, 2001