Ultra Wideband (UWB) & Radio Phy

Transcription

1 Ultra Wideband (UWB) & Radio Phy speaker: Predrag Spasojevic Dipankar Raychaudhuri, Larry Greenstein, Ivan Seskar, Leo Razoumov, James Evans, Di Wu, Guofeng Lu, and Mustafa Demirhan May 2003, IAB Meeting

2 Research Project Sample (some PHY and most UWB) Scheduling algorithms for QoS Mustafa Demirhan Channel & throughput measurements for IEEE a Praveen Gopalakrishnan Error control coding and Hybrid ARQ for 1xEVDV Ruoheng Liu UWB pulse and antenna design meeting FCC spectrum limit Guofeng Lu Multipath beamforming UWB based on ternary sequences Di Wu

3 UWB pulse and antenna design meeting FCC spectrum limit Guofeng Lu L.Greenstein, P. Spasojevic, I. Seskar, D. Raychaudhuri

4 Outline FCC spectrum MASK for indoor communications FCC pulse Synthesizing FCC pulse Antennas and filtering for an FCC pulse Conclusion

5 Using two Gaussian 2 nd derivative combinations FCC pulse Optimal synthesis Amplitude [V] Time [ns ]

6 Spectrum C EIRP [dbm/mhz] B D A FCC mask Optimal synthesis Frequency [GHz]

7 Diamond and rounded diamond antenna

8 Frequency response of diamond antenna 0 Amplitude [db] Signal spectrum Published diamond response Simulated diamond Simulated rounded diamond Frequency [GHz]

9 Filter Design HT ( f ) Data Pulse Generator P( f ) Pulse Shaping Filter ( f ) G T X( f) G ( f ) 1 G2 ( f)

10 FCC pulse projected onto the first 6 non-zero elements of the Hermite basis FCC pulse Projection onto first 6 items Amplitude [V] Time [ns ] x 10-10

11 Spectrum comparison EIRP [dbm/mhz] FCC mask He rmite pulse e xpa ns ion Frequency [GHz] x 10 9

12 Conclusion A simple synthesized pulse for a FCC MASK is devised based on a linear combination of two Gaussian 2 nd derivatives. Rounded diamond antenna is a good candidate for UWB. SNR losses for different antenna and pulse combinations are compared Hermite pulses could be used as a basis for constructing pulses meeting arbitrary spectrum regulations.

13 Multipath Beamforming UWB Signal Design based on Ternary Sequences Di Wu Predrag Spasojević and Ivan Seskar

14 TS-UWB Ternary sequence with elements in {-1, 0, +1} is particularly suitable for impulse based communication system

15 Ternary versus Multilevel Analog Channel Transmitter Digital Receiver? OR Multilevel Ternary

16 Adaptive Transmission In UWB Transmitter Multipath? Receiver

17 Adaptive Transmission In UWB Transmitter evaluate the sign of the first L c paths. selects one of the beamforming sequences Receiver: non-adaptive correlator the energy of the first L c paths are coherently combined

18 Beamforming sequence design transmitter and receiver know the channel exhaustive searchfor short beamforming sequences only the transmitter knows the channel Energy based beamforming sequence Low correlation beamforming sequences

19 Scheduling Algorithms for QoS over Wireless Channels* Mustafa Demirhan and Prof. Dipankar Raychaudhuri QoS analysis of MAC for VBR flows in of: Multimedia traffic: MAC Performance metrics Job failure rate (JFR) Response time (RT) Effect of channel utilization on JFR and RT Scheduling analysis over MAC * In collaboration with Intel

20 MAC Overview high-speed Wireless Personal Area Networks (WPANs) low power, low cost solutions addressing the needs of portable consumer digital imaging and multimedia applications. timing in the piconet is based on the superframe, which is illustrated in the figure below.

21 Conclusions Only a single byte is necessary for Quality of Service (QoS) support in infrastructure-based wireless networks. Fair-SRPT based scheduling outperforms proportional share resource allocation and CBS by % Complexity of Fair-SRPT is similar to that of proportional share resource allocation and CBS. Fair-SRPT fairly allocates resources under all utilization levels for flows with different mean data rates.