Examples of UWB systems

Transcription

1 Hotchips 004 Introduction to UWB systems Roberto Aiello, Ph.D. 9//004 Slide Summary Introduction to unlicensed spectrum and UWB Examples of UWB systems Application examples 9//004 Slide

2 Tendency to allocate more unlicensed spectrum UWB is about low power transmission and nonharmful co-existence with other services Unlicensed use sharing licensed spectrum Radio systems are smarter than 70 years ago Spectrum management based on old assumptions Future UWB systems will be different from systems analyzed before rulemaking UWB spectrum characteristics allow high bit rate, short range (MBOA) low power, location awareness (IEEE a) ISM: Industrial, Scientific, Medical U-NII: Universal National Information Infrastructure MBOA: MultibandOFDM Alliance UWB: Ultra-wideband 9//004 Slide The cost of licensed spectrum halves every six months 0, $/Hz, Spectrum Auctions 994: 500kHz at $M Interactive Video and Data Services 000: at $.M Broadcast Auction //004 Slide 4

3 FCC spectrum mask Same limit of unintentional radiator allowed by part 5 for EMI 9//004 Slide 5 Source: Ed Thomas, FCC, 00 9//004 Slide 6

4 Interference to existing signals UWB Transmitter we detected no changes in the spectrum, video quality, E b /N 0 or pre-viterbi BER of the FSS downlink signal when the UWB transmitter was turned on. [Source: Infocomm Development Authority of Singapore (IDA), June 004] Results have shown levels of interference similar to what is already allowed by the rules [Source: MBOA, January 004] 9//004 Slide 7 Example of Single UWB ST Micro: doc.: I EEE / 9 r BW - 0dB = 7.6 GHz 9//004 Slide 8 4

5 DS-UWB 9//004 Slide 9 Spectral Keying Modulation UWB Symbol in Time Voltage Transmit or more subpulses using different bands Order of bands defines symbol doc.: IEEE /05r Time (ns) 9//004 Slide 0 5

6 Example of multiband UWB: OFDM Source: Infocomm Development Authority of Singapore (IDA) ns Guar d I nt er val f or TX/ RX Switching Time.5 ns 60.6 ns Cyclic Pr ef ix f r eq () Per iod = 97.5 ns 9//004 Credits: TI TGa proposal Slide t ime MBOA(*) specification summary Group Group Group Group 4 Group 5 # # # # 4 # 5 # 6 # 7 # 8 # 9 # 0 # # # # 4 Mandatory Optional Optional Optional Optional Link Margin Ref. ( 0 db) db db db 8 tones Channel Num ber 4 Group Length 6 TFC MBOA PHY Specification.0 Switching Within Set # GHz GHz s, and Each occupy 58 Subcarriers 8 tone OFDM Tone width: 4.5 Tone m modulation: QPSK (*) Global Solution: Flexible band plan and use of OFDM subcarriers allows for spectrum shaping which can be used to m eet worldwide regulatory requirem ents 9//004 Slide 6

7 RF CMOS for UWB Using appropriate design techniques and optimizations an ultrawideband multiband- OFDM analog front end can be implemented in low-cost standard CMOS. Standard CMOS Ultraw ideband Single- Chip Solutions By Dan Meacham and Krishnamurthy Soumyanath EE Times May 7, 004 9//004 Slide Main interest in two areas 000 Throughput capacity, Mb/s 00 0 UWB 80.a 80.b Indoor range, m 9//004 Slide 4 7

8 Many stars need to be aligned W ireless W orking Group Promoter s Group Proposed system architectures for W ireless USB and W ireless 94 Board of Directors Key Contributors Group: W -USB W Convergence Layer MAC PHY 9//004 Slide 5 Industry timeline for WUSB You Are Here //05 Silicon engineering samples 4//05 End Products prototypes 0//05 End Products on shelves 8//04 Spec 0.8 0//04 Spec 0.9 Plug fests 4//05 Spec.0 7//05 Start product certification 9//004 Slide 6 8

9 High bit rate applications Mobile Home 80.x Office (opt) Memory Stick Internet i.li NK Office (core) etc Network Services doc.: IEEE /04r0 doc.: IEEE /9r0 Sony s View I ntel s View Consum er Electronics W ireless Multim edia PNC Personal Com puting W ireless Desktop Supported data Rates 0, 0 0, Mbps Range: 0 m, 4 m, 4 m Pow er: 0 0 m W, 5 0 m W? PNC N okia s View Mobile Connectivity Source: I EEE Value Proposition: Hundreds of Mbps operating at low pow er and provided at low cost 9//004 enabling w ireless m ultim edia and high Slide speed 7 cable replacem ent Conclusions Opportunity for spectrum sharing High performance, low cost systems are feasible Commercial opportunity for high bit rate applications Strong industry support worldwide 9//004 Slide 8 9