How to ATTACK Problems Facing 3G Wireless

Communication Systems

Sridhar RajagopalECE Dept.

Rice University

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

How Do I ATTACK this Problem

At the Algorithm Level

•Better Algorithms–Coding & Decoding–Detection–Using Other Diversity Techniques

•Push Towards Lower BER•Maintain certain QoS

At the Implementation Level

•Base-Station•Mobile Handset•ISSUES :

–IT’s DIFFERENT!

Base-Station

•Throughput,Throughput and more Throughput!

•Size - No BAR•Display - No BAR•Power - No BAR

Mobile Handset

• Power• Size• Display• Throughput• “ This is what the Consumer sees

of 3G Wireless Communications”

IDEA

•Push Complexity Towards the Base-Station– [aka all the multi-’s]

•Make Mobile Handset as {simple,sleek,smart,soon, supple} as possible (ASAP)

Work Done So Far

• DSP• Channel Estimation• Multiuser Detection

– [DSPFEST’99]

• Meeting Third Generation Requirements– [Asilomar’99]

Coming Up Next (only on the RENÉ)

•FPGA’s [Xilinx]•ASIC’s [Cadence]• Multiprocessor Boards

[Sundance]• Making Algorithms suitable for

Implementation•Low Power Issues

NOW WHAT???

Proposed Base-Station Implementation

TI's Wireless Basestation (http://www.ti.com/sc/docs/psheets/diagrams/basestat.htm)

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.

Mobile Handset

TI's Wireless Handset Solution (http://www.ti.com/sc/graphics/apps/wireless/bdiagram.gif)

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!

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 ???

Future Directions

•Comparing Different Types of Detectors Suitable for Implemention {Diff. Algorithms}

•Complexity - BER Tradeoff.

Future Directions

Give the World the best Wireless

Communication System