- 1 - a powerful dual-mode ip core for 802.11 a/b wireless lans

- 1 -C o m m u n ic atio n S y s tem L ab o rato ryS c ho o l o f IC E S un gK y u n K w an U n iv .

A Powerful Dual-mode IP core for A Powerful Dual-mode IP core for 802.11 a/b Wireless LANs802.11 a/b Wireless LANs


ContentsContents

IntroductionIntroduction

WiLDWiLD (WLAN(WLAN IP for LSI Design)IP for LSI Design)

The architecturearchitecture

PerformancePerformance

IP developmentdevelopment && integrationintegration

CompleteComplete WLANWLAN systemsystem developmentdevelopment

ConclusionConclusion



WLAN systemWLAN system

Being able to connect to a network without having to physically connect wire

It reduces the cost of wiring the office

It removes the need of a physical reconfiguration in case of an office move

New ways to use the WLAN connections in innovative products

Wireless portable flat screen TV sets

Digital camcorders that connect to a PC with a wireless link



802.11a / 802.11b802.11a / 802.11b

To address the need of unified standard

Allow multiple devices to interoperate

The 802.11 standard is the most popular

Allow easy bridging between several means of transporting information over different media

The 802.11 standard supports several physical layer

DSSS / CCK in the 2.4GHz ISM band (802.11b)

OFDM in 5GHz band (802.11a)


WiLD (WLAN IP for LSI Design)WiLD (WLAN IP for LSI Design)

It contains all the parts that are necessary to make the system run

Concentrate on the final application and only have to

Only have to integrate the IP in their ASIC

Several elements of WiLD product

WiLD RF – dual band (2.4GHz / 5GHz) CMOS radio IP

WiLD Software – multi-standard (802.11a / b / e / g / h / i…) protocol software

WiLD MAC – a powerful processor-based hardware platform

WiLD Modems – hardware signal processing blocks dedicated to a given modulation scheme


Architecture of the WiLD PlatformArchitecture of the WiLD Platform

The platform has been designed to be usable for many different projectsThe platform has been designed to be usable for many different projects

It’s not specific to 802.11 or any wireless standardIt’s not specific to 802.11 or any wireless standard

It has high bandwidth of 320 Mbps at 80MHzIt has high bandwidth of 320 Mbps at 80MHz

The backbone bus is used to move data between the processing blockThe backbone bus is used to move data between the processing block

Direct memory access is built in all data processing blockDirect memory access is built in all data processing block

The processor is not involved in moving blocks of dataThe processor is not involved in moving blocks of data Being able to concentrate on handling the protocol Being able to concentrate on handling the protocol Low performance processor can handle very high data ratesLow performance processor can handle very high data rates Processing power required doesn’t grow linearly with data rate Processing power required doesn’t grow linearly with data rate

The architectureThe architecture



WiLD MAC PlatformWiLD MAC Platform


Internal RAM of the platformInternal RAM of the platform

It is used to store the software and to buffer the data packetsIt is used to store the software and to buffer the data packets

It allows downloading the firmware from an external flash or directly from the hostIt allows downloading the firmware from an external flash or directly from the host

External RAM of the platformExternal RAM of the platform

It is used to augment the buffering capacity in particularly demanding applicationsIt is used to augment the buffering capacity in particularly demanding applications

External System Bridge External System Bridge

It is only interface to the controlling systemIt is only interface to the controlling system



Architecture of the 802.11 specific blocksArchitecture of the 802.11 specific blocks

Sample stream coming from the radio in reception mode is first handled by the modemSample stream coming from the radio in reception mode is first handled by the modem

ModemModem

Modem performs all signal processing Modem performs all signal processing

Filtering Filtering Compensation DC offset & I/Q mismatchCompensation DC offset & I/Q mismatch Timing & Frequency synchronization Timing & Frequency synchronization Estimation & Compensation of the channel responseEstimation & Compensation of the channel response Demodulation & DetectionDemodulation & Detection




Block diagram of 802.11bBlock diagram of 802.11b



Block diagram of 802.11aBlock diagram of 802.11a


PerformancePerformance

BER curveBER curve

11stst curve curve AWGNAWGN Ideal receiverIdeal receiver

22ndnd curve curve Radio impairment effectRadio impairment effect

(I/Q mismatch, various offset)(I/Q mismatch, various offset)

33rdrd and 4 and 4thth curve curve Multipath channelsMultipath channels Small and large office environmentsSmall and large office environments


IP development & integrationIP development & integration

Design methodology & flowDesign methodology & flow

The system study and the The system study and the prototyping platform definitionprototyping platform definition

Draft of the complete system has Draft of the complete system has been definedbeen defined

Partitioning and interfaces between Partitioning and interfaces between the main parts (RF , Base band the main parts (RF , Base band hardware , Software)hardware , Software)

System engineer can detail the System engineer can detail the specification of all different blocksspecification of all different blocks


Customers can reuse the prototyping platform to build a realistic trial productCustomers can reuse the prototyping platform to build a realistic trial product

Building around the existing FPGA board allows to directly start on the development or Building around the existing FPGA board allows to directly start on the development or adaptation of the final software applicationadaptation of the final software application

Without having to wait for the samples of the final ASICWithout having to wait for the samples of the final ASIC

There is only need for verification of the interfaces There is only need for verification of the interfaces

No significant amount of time has to be spentNo significant amount of time has to be spent

Designer can concentrate on the final applicationDesigner can concentrate on the final application

Complete WLAN system developmentComplete WLAN system development


Time to market becomes more importantTime to market becomes more important

The product manufacturers have less time to spend in R & DThe product manufacturers have less time to spend in R & D

Benefit from acquiring external IPBenefit from acquiring external IP

It allows quick low – risk development of a working productIt allows quick low – risk development of a working product

The trend in WLAN are towards more integration The trend in WLAN are towards more integration

WiLD IP support the integration of several standards into the same chipWiLD IP support the integration of several standards into the same chip

ConclusionConclusion

- 1 - a powerful dual-mode ip core for 802.11 a/b wireless lans

Documents

data processing

wild platform

data packets

architecture slide

data rate processing

moving blocks of data

wireless standard

lsi design wild wlan