1. How to ATTACK Problems Facing 3G Wireless Communication Systems
Sridhar Rajagopal
ECE Dept.
Rice University

2. Motivation
People want to use better wireless communication systems with higher data rates, supporting more users and providing a certain QoS while :
having a lower power handset with a smaller size but a larger display

3. How Do I ATTACK this Problem

4. Better Algorithms Push Towards Lower BER Maintain certain QoS
At the Algorithm Level
Better Algorithms
Coding & Decoding
Detection
Using Other Diversity Techniques
Push Towards Lower BER
Maintain certain QoS

5. At the Implementation Level
Base-Station
Mobile Handset
ISSUES :
IT’s DIFFERENT!

6. Throughput,Throughput and more Throughput! Size - No BAR
Base-Station
Throughput,Throughput and more Throughput!
Size - No BAR
Display - No BAR
Power - No BAR

7. Mobile Handset Power Size Display Throughput
“ This is what the Consumer sees of 3G Wireless Communications”

8. Push Complexity Towards the Base-Station
IDEA
Push Complexity Towards the Base-Station
[aka all the multi-’s]
Make Mobile Handset as {simple,sleek,smart,soon, supple} as possible (ASAP)

9. Work Done So Far DSP Channel Estimation Multiuser Detection
[DSPFEST’99]
Meeting Third Generation Requirements
[Asilomar’99]

10. Coming Up Next (only on the RENÉ)
FPGA’s [Xilinx]
ASIC’s [Cadence]
Multiprocessor Boards [Sundance]
Making Algorithms suitable for Implementation
Low Power Issues

11. NOW WHAT???

12. Proposed Base-Station Implementation
TI's Wireless Basestation (

13. Problems with Base-station
C6203 only for Channel Enc. & Dec. [No Multiuser Detection]
Multiuser Detection not possible on a single DSP.
Task Partitioning and Pipelining required [on the lines of Asilomar’99]
Multi-processing Element Solution to meet Real-time.

14. Mobile Handset
TI's Wireless Handset Solution (

15. Problems with Mobile Handset
Run it on SOLAR Energy
Minimize Size
ATTACK units that consume maximum power
Apply Power Reduction Techniques at all possible layers
Make it COOL!

16. Future Directions Optimal Hardware Mapping
Uplink/Downlink
m FPGA’s
n DSP’s
o ASIC’s
p GPP’s
Making Algorithms suitable for Implementation
Reconfigurability ???

17. Complexity - BER Tradeoff.
Future Directions
Comparing Different Types of Detectors Suitable for Implemention {Diff. Algorithms}
Complexity - BER Tradeoff.

18. Give the World the best Wireless Communication System
Future Directions
Give the World the best Wireless Communication System