Attachment ex parte

This document pretains to SAT-MOD-20031118-00333 for Modification on a Satellite Space Stations filing.

IBFS_SATMOD2003111800333_372567

ShawPittman LLP -~ .__ __. A Limited Liabilily Partnership Including Professionnl Corporations March 25,2004 Via Hand Delivery LI -c, Ms. Marlene H. Dortch MAR 2 5 2004 Secretary Federal Communications Commission 445 12th Street, S.W. Washington, D.C. 20554 Re: Mobile Satellite Ventures Subsidiary LLC Ex Parte Presentation IB Docket No. 01-185 File No. SAT-MOD-20031 118-00333 (ATC application) File No. SAT-AMD-20031118-00332 (ATC application) File No. SES-MOD-20031118-01879 (ATC application) File No. SAT-AMD-20040209-00014 (replacement satellite application) Dear Ms. Dortch: Mobile Satellite Ventures Subsidiary LLC (“MSV”) hereby files the attached e-mail correspondence from Dr. Peter D. Karabinis, Vice President and Chief Technical Officer of MSV, to Paul Locke of the International Bureau dated March 24,2004. Please direct any questions regarding this matter to the undersigned. Very truly yours, + d p David S. Koncza cc: Paul Locke Washington, DC Northern Virginia New York Los Angeles 2300 N Street, NW Washington, DC 20037- 1128 202.663.8000 Fax: 202.663.8007 www.shawpittmun.com London ~~- ~

From: “Peter Karabinis” [pkarabinis@msvlp.corn] Sent: 03/24/2004 0 7 : 0 4 PM To: <plocke@fcc.gov>; cedrocella@ntia.doc.gov> Cc: Bruce Jacobs Subject: Cancellation of ATC-Induced interference over M S V ’ s Space Segment Gentlemen, our interference canceller prototype is now working “over-the-air” on MSV’s system. The simulated ATC interference signal is being launched fi-om Canadaover a first satellite cell, while the desired satellite signal is being launched from RestonVAover a second satellite cell. In the absence of the canceller, the level of interference can be increased until the degradation to the desired signal exceeds 200% Delta T/T (rendering the desired signal useless). With the canceller operative, the residual Delta T/T is maintained at less than 6% (and even becomes negative for small levels of interference due to maximal ratio combining of desired signal contributions of the adjacent satellite cell). The prototype is jointly achieving maximal ratio combining and interference cancellation. The two effects can be demonstrated separately. I invite you to visit MSV to witness this milestone event. Please feel fi-ee invite anyone else from your respective organizations that may also be interested and/or skeptical. Hope to see you soon. (I and the team are here all the time so simply indicate your preference and we’ll be here to accommodate). Peter.


Document Created: 2004-05-12 15:59:23
Document Modified: 2004-05-12 15:59:23
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