Spectral Mask and Field Trials of a COFDM Modem
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1 Spectral Mask and Field Trials of a COFDM Modem Document Number: IEEE p-01/44 Date Submitted: Source: Jonathan Labs, Yvon Belec, J. Pierre Lamoureux, Voice: (514) ext 325 Stephan Leclerc, Rainer Ullmann, Donovan Young, Fax: (514) Xiaode Yu jlabs@wavesat.com Wavesat Telecom, Inc rue Cousens Ville St-Laurent, QC H4S 1X3 Canada Venue: Session 12 of the Plenary, Task Group #3 Base Document: IEEE c-01/44 < Purpose: Provide information for comparison of the various PHYs. Notice: This document has been prepared to assist IEEE 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 grants a free, irrevocable license to the IEEE to incorporate text contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE IEEE Patent Policy: The contributor is familiar with the IEEE Patent Policy and Procedures (Version 1.0) < including the statement IEEE standards may include the known use of patent(s), including patent applications, if there is technical justification in the opinion of the standards-developing committee and provided the IEEE receives assurance from the patent holder that it will license applicants under reasonable terms and conditions for the purpose of implementing the standard. Early disclosure to the Working Group of patent information that might be relevant to the standard is essential to reduce the possibility for delays in the development process and increase the likelihood that the draft publication will be approved for publication. Please notify the Chair <mailto:r.b.marks@ieee.org> as early as possible, in written or electronic form, of any patents (granted or under application) that may cover technology that is under consideration by or has been approved by IEEE The Chair will disclose this notification via the IEEE web site <
2 Spectral Mask and Field Trials of a COFDM Modem Jonathan Labs Yvon Belec J. Pierre Lamoureux Stephan Leclerc Rainer Ullmann Donovan Young Xiaode Yu Wavesat Telecom, Inc.
3 Abstract Goal of this presentation is to: demonstrate how well a COFDM signal meets the spectral mask requirements of the FCC regulation 47CFR illustrate the performance of a COFDM point-to-point connection under line-of-sight and near or non-line of sight conditions All data here is real (and preliminary), taken either in the lab or in the field using the Wavesat Tiger Modem.
4 The OFDM Signal PHY specification: Total bandwidth = 6 MHz 828 carriers / 1024 point FFT Carrier spacing = 6.5 khz Cyclic prefix = 10 µs 64-QAM, 16-QAM and QPSK modulation modes RS error control coding (106, 122, 8) Three training symbols and a configuration symbol out of 115 symbols in a frame
5
6 Spectral Mask Peak-to-average Power--10 db (includes scrambling w/ PRBS). Clipping rate < 0.5 % (64-QAM on OFDM) Power Amplifier P1dB compression point is -9 dbm Backing off by 6 db...
7 6 db back-off from PA P1dB => No significant problem meeting the FCC mask requirements, with the possible exception at the ± 6MHz points. This deviation will be fixed by appropriate filtering.
8 Field Trials We wish to illustrate the type of frequency selective fades encountered in the MMDS frequencies and the qualitative performance of a COFDM modem under these conditions. System configuration: point-to-point. FDD, using experimental licenses from Industry Canada for GHz and GHz. EIRP required to be no more than 10 mwatt. 60 antennas. van based for portability. Data stream--mpeg over ATM and then ATM over COFDM
9 Point to point MMDS wireless system
10 Connection #1: Line-of-sight The two vans were parked approximately 500 meters apart. LOS Channel Response A link was easily established with the 64-QAM configuration.
11 Connection #2: Non-LOS The two vans were parked such that the receiver was seeing a diffracted and a reflected signal
12 Connection #2: Non-LOS (cont.) Non-LOS Channel Response A stable link was established with the QPSK configuration.
13 Connection #3: Non-LOS The two vans were parked such that the receiver saw only a reflected signal
14 Connection #3: Non-LOS (cont.) Non-LOS Channel Response A stable link was established with the QPSK configuration.
15 Conclusions We have demonstrated that the spectral mask requirements are not an issue for COFDM for back-off of only 6 db. some of the channel responses that COFDM can handle. In the future, we wish to present more quantitative results on the performance of the modem in the lab, for example BER vs. back-off, and in the field for the various non- LOS conditions.
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