Attachment 2009XM Radio ltr jul

2009XM Radio ltr jul

LETTER

letter

2009-07-20

This document pretains to SAT-L/A-19930115-00010 for Launch Authority on a Satellite Space Stations filing.

IBFS_SATLA1993011500010_1118778

FILED/ACCEPTED JuL 2 02008 CommiIission Federal Communications reaet Office of the Secretary SI IUS RADIO INC. Ca\\ %¢mSall®‘. . 1500 Ecking:on Place, NE 3ff}— TJC— 2067 0330 Washington, D.C. 20007 2M~LIA— 1993 01(5— C008 I Tek 202:380—4000 Ca\l 3\(-{“ lt SfT— mojp — aot#103q.. OO 1 Fax: 202—380—4500 SAUTL/A ©93¢01u6—o00C wwwSsimus.com wwwXmeqo.Com Opit agn, Salis . 5(_\?5-:\,_9\?]’_' 300M OBA COONR_ July 20, 2009 Sat— T]C— abo]0320— COCS q Marlene H. Dortch, Secretary QCan 310{“'. S,ae\‘T Federal Communications Commission Sat— Amb—acmr0l24—o0o633 Office of the Secretary ST BPL— 30M Daa ~— OOO1G 445 12th Street, SW & i i Washington, DC 20554 Cail (&(67‘ S3TRip SFrI—LOR— 320090217 — 00253 Re: XM Radio Inc. Improved Modulation Technology Call Signs S2118, 82119, S2616, S2617, 82786 Dear Ms. Dortch: XM Radio Inc. {"XM") hereby notifies the Commission that beginning today, XM intends to commence long—term testing and deployment of an improved modulation technology over its satellites. The planned modulation, known as hierarchical or overlay modulation, is expected to increase XM‘s total network capacity by approximately twenty—five percent. Essentially, hierarchical modulationincreases the number of bits that are transmitted through the satellite and terrestrial repeater networks, thereby improving spectrum efficiency. Once this modulation system has been fully implemented, XM maybe able to add additional programming and innovative ancillary services for the benefit of its satellite radio subscribers.‘ XM‘s planned modulation change conforms to the technical parameters of XM‘s currently authorized satellites and terrestrial repeaters. Similarly, the new modulation conforms to the technical parameters described in XM‘s pending application for the new XM—5 satellite and other pending authorizations. Satellites providing the Sirius satellite radio service have used hierarchical modulation since June 2005. See "SIRIUS to Increase Programming Capacity Over Its Existing Satellite Radio System," http://investor.sirius.com/ReleaseDetail.cfm?releaseid=165885 (last visited July 20, 2009).

Marlene H. Dortch, Secretary July 20, 2009 Page 2 Should any questions arise in connection with this matter, please contact the undersigned. \.;ery truly yours, tds £Ally PL*— 2 3 Jaines S. Blity Vice President, Regulatory Counsel oo {via emaily: John CGiusti Julius Knapp Robert Nelson


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Document Modified: 2015-12-07 14:15:43
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