- 1 - A Powerful Dual-mode IP core for 802.11 a/b Wireless LANs.
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Transcript of - 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
- 2 -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 .
ContentsContents
IntroductionIntroduction
WiLDWiLD (WLAN(WLAN IP for LSI Design)IP for LSI Design)
The architecturearchitecture
PerformancePerformance
IP developmentdevelopment && integrationintegration
CompleteComplete WLANWLAN systemsystem developmentdevelopment
ConclusionConclusion
- 3 -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 .
IntroductionIntroduction
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
- 4 -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 .
IntroductionIntroduction
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)
- 5 -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 .
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
- 6 -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 .
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
- 7 -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 .
The architectureThe architecture
WiLD MAC PlatformWiLD MAC Platform
- 8 -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 .
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
The architectureThe architecture
- 9 -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 .
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
The architectureThe architecture
- 10 -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 .
The architectureThe architecture
Block diagram of 802.11bBlock diagram of 802.11b
- 11 -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 .
The architectureThe architecture
Block diagram of 802.11aBlock diagram of 802.11a
- 12 -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 .
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
- 13 -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 .
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
- 14 -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 .
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
- 15 -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 .
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