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Doc.: IEEE 802.15-09-0152-00-0thz Submission March 2009 Young-Chai Ko,Korea UniversitySlide 1 Project: IEEE P802.15 Working Group for Wireless Personal.

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Presentation on theme: "Doc.: IEEE 802.15-09-0152-00-0thz Submission March 2009 Young-Chai Ko,Korea UniversitySlide 1 Project: IEEE P802.15 Working Group for Wireless Personal."— Presentation transcript:

1 doc.: IEEE thz Submission March 2009 Young-Chai Ko,Korea UniversitySlide 1 Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs) Submission Title: Path loss measurements of Sub-Tera Hz band Date Submitted: March 2009 Source: Young-Chai Ko, Moon-Il Kim, Jun Heo Address [School of Electrical Engineering, Korea University, Anam-dong, Seungbuk-gu, Seoul , Korea] Voice:[ ], FAX: [ ], Re: [] Abstract:This is path-loss measurement results in 100GHz – 400 GHz Sub-Tera Hz band. Purpose:Informative Notice:This document has been prepared to assist the IEEE P It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Release:The contributor acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P

2 doc.: IEEE thz Submission March 2009 Young-Chai Ko,Korea UniversitySlide 2 Path loss measurements of Sub-Tera Hz band

3 doc.: IEEE thz Submission Path loss measurements of Sub-Tera Hz band Path loss measurement in short distance within 1m for the application to WPAN [Doc: thz]. Measured frequency band: –100GHz –200GHz –300 GHz –400 GHz Acknowledgement –Experiment setup and measurement : Prof. H. Xin from U of Arizona and Prof. Moon-Il Kim from Korea University March 2009 Young-Chai Ko,Korea UniversitySlide 3

4 doc.: IEEE thz Submission Introduction to Measurement Setup March 2009 Young-Chai Ko,Korea UniversitySlide 4 - Transmitter / Receiver heads - Laser unit - Collimating optics - Control and optical delay -Grating compensation unit -Dipole antennas at the TX and RX 1. Major Parts of Measurement Setup (TDS, T-Ray 2000®) 2. Characteristics of Measurement Setup - Tx and Rx are synchronized internally. -Time-domain response is measured and Fourier- transformed by externally connected computer Laser Unit1 Laser Unit2 Tx /Rx Head1 Tx /Rx Head2 Tx/Rx Head is connected with computer.

5 doc.: IEEE thz Submission Measurement Results Tx/Rx distance ranging from 55.88cm to 76.22cm, with ~1 inch step increment Loss factor(=relationship between Power(dB) and Distance(dB)) value is close to 2/20cm March 2009 Young-Chai Ko,Korea UniversitySlide cm 1 inch

6 doc.: IEEE thz Submission Analysis in Frequency Domain Fourier transformed relative E-field magnitudes and phases for all 8 distances, taking 55.88cm(shortest distance) spectrum as the reference. Monotonically decrease as the distance increase within ~450 GHz Phase in good match with plane-wave expected values March 2009 Young-Chai Ko,Korea UniversitySlide cm reference line, 0dB 55.88cm reference line, 0 rad

7 doc.: IEEE thz Submission Analysis in Frequency Domain March 2009 Young-Chai Ko,Korea UniversitySlide 7 Matlab fitted loss factor /20cm Matlab fitted loss factor /20cm Matlab fitted loss factor /20cm Matlab fitted loss factor /20cm

8 doc.: IEEE thz Submission Link Budget Analysis Link budget where March 2009 Young-Chai Ko,Korea UniversitySlide 8 : transmitted carrier power : transmitter antenna gain : path loss : receiver antenna gain : receiver implementation losses : Noise Power calculated as : Boltzman’s constant : Receiver noise bandwidth : Noise figure Link Budget Bw=10GHzBw=20GHz 0.5m (Lp=5dB) dBm dBm 1m (Lp=10dB) dBm dBm = = 3dB, =10mW, F=5dB Example of link budget

9 doc.: IEEE thz Submission Maximum Allowable Path Loss Maximum allowable path loss [G. Stuber, Principles of Mobile Communication] –where is the receiver sensitivity which can be calculated as : received energy per modulated symbol : Noise spectral density given as : Data rate in bits per sec Example with =5dB, =3dB, and =10dBm in room temperature March 2009 Young-Chai Ko,Korea UniversitySlide 9 10Gbps20Gbps BER 0.1%0.001%0.1%0.001% Max. allowable path loss [dB] Max Distance [m]

10 doc.: IEEE thz Submission Conclusion and Future Discussion Waveform maxima and field magnitude monotonically decrease as the Tx/Rx distance increases with the path loss of 1dB/10cm. At least within 1meter, the data rate of 10~20Gbps is possible in the LOS environment. It is needed to –Measure the path loss beyond 1meter. –Measure the delay profile March 2009 Young-Chai Ko,Korea UniversitySlide 10


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