Attachment Comments

Comments

COMMENT submitted by ViaSat, Inc.

Comments

2006-08-04

This document pretains to SES-LIC-20060629-01083 for License on a Satellite Earth Station filing.

IBFS_SESLIC2006062901083_519007

RECEIVED b Before the FEDERAL ‘OMMUNICATIONS COMMISSION AUG — 4 2006 Washington, DC 20584 edenCommuncafon Connisson In the matter of OtcectSecminy Application of RaySat, Inc. for ority to File No. SES—LIC—20060629—01083 Operate 4,000 In—Motion Mobile atelite Antennas in the 14.0—14.5 GHe at d 11.7— 12.2 GHz Frequency Bands CC oniMENTs OF VIASAT, INC. | ViaSat, Inc. (*Via at") submits the following comments regarding the above— referenced application of RaySat Inc. (‘RaySat") for authority to operate 4,000 in—motion mobile satelite antennas in the 1 .0—14.5 GHz and 11.7—12.2 GHz frequency bands.". ViaSat provides and develops Ku band Srvices and equipment. Thus, ViaSat has an interest in Hicensing decisions impacting th {development of new technologies that expand the capabilities of Ku band systems. RaySat‘s A plication contains numerous technical deficiencies, and operation of RaySat‘s in—motiont ‘ntennas as proposed in the Application could result in harmfal interference to adjacent satellite ietworks. The Commission should not grant RaySat‘s requested authority unless RaySat cures sul th deficiencies and resolves the interference issues identified herein. 3 INTROPUCTION & BACKGROUND In its Applicationy RaySat seeks blanket authority for a 2—way phase combined, low—profile antenna that will be lounl:d on vehicles and operated while in motion to provide Application ofRaySat, Inc r Authority to Operate 4,000 In—Motion Mobile Satellite Anternas in the 14.0—14.3 4[1 and 11.7—12.2 GHz Frequency Bands, File No. SES—LIC— 20060629—01083, Public N ice, Report No. SES—00834 (rel. July S, 2006) (the "Application").

users with high—speed data comm inications while traveling in vehicles* The antenna will use a single channel per carrier (‘SCPC modem and will communicate with a number of satellites | through several control points.® As a general matter [ visess anioersgee me $oo 10 sotorire new end iinovence uses of the FCC Ku band spectru , including land mobile satellte service ("LMSS®). However, ViaSat has identified numerous t@ ‘inical deficiencies in RaySat‘s Application regarding the proposed network and operations | RaySat‘s proposed LMSS system does not have a central network management system (°N S"). This lack of central control significantly limits RaySat‘s ability to prevent interference int adjacent satellte networks and to track incidents of interference. More importantly, taySat‘s use of a simple unspread modem in a system without a NMS cannot adequately protect ag liacent satellites from interference. The pointing error in RaySat‘s proposed system, comb ined with the high power densities emitted by the SCPC modem, further raises the interfe j« potentil of the network. Additionally, the Commission should require RaySat to provide ink budgets to demonstrate thatit can feasibly provide service at the proposed power levels and rithout causing interference into adjacent operations. The Commission should require Ray ht to address the technical deficiencies and the potential interference issues described in these comments beforeit rants the authorization RaySat | requests in the Application. 11 Tme us or AN UNsB AD SIGNAL WITHOUT A NETWORK MANAGEMENT SYST Em INCREASES THE INTERFERENCE POTENTIAL or RaYsATs PROPG SED SYSTEM RaySat‘s proposee system does not adequately protect adjacent satellites from interference due to the use of a s inple unspread modem and a lack of central control in the Application at 5. 3 14. at?2.

network* RaySat‘s Application I sts a number of control points, but does not identify one as the central control point.* The lack of central control gives each antenna terminal user the abilityto control the bandwidth modulation land coding and places the onus on the user to manage compliance with the off—axis EIRI density (*OAED®) mask set forth in Section 25.209 ofthe Commission‘s rules." Typically, e price ofbandwidth leased by satellite operators is based on the greater of the bandwidth utilig tion and the power utilization on the transponder. In RaySat‘s proposed network, the antennas 11 use more bandwidth than power;" thus, end users with ess regulatory awareness may have incentive to operate athigher power levels and less bandwidth to reduce transpondert osts, and thereby could potentially increase the power spectral density to OAED levels that wot violate the Section 25.209 mask. Without central network control, RaySat would be unable fto verify that the network operations conform to the specified Hicense parameters. Instead, Ra at would need to rely on the satellite operator t inspect and verify the network link budgets t insure compliance, Further, the lack a central control point in ReySat‘s proposed network configuration severely limits the abilty of adjacent satellte users to track incidents of interference. When an adjacent Qperator suspects a RaySat LMSS terminal of interference, the adjacent operator would need to iontact several different control points, rather than one central Jd; Application, FCC Form 12 at 15. Application at 2. 47 CRR. §25.209. Based on the technical data at RaySat provides in the Application, VieSat estimates that a 128 kbit‘s signal in RaySatl system will use 1.422% of the transponder bandwidth but only 0.121% of the transmitter er, assuming a 0 dB transponder input attenuation. See Link Budget Calculations, attach hereto as Exhibit A. ViaSat calculated the link budgets based on data in RaySat‘s Applic ton and nominal values for satelite performance thatreflect parameters generally acce d in the satellte industry for Ku band service, using standard link budget formulas preser d in engineering texts such as "Satellite Communication System Engincering" by Wi lour Pritchard, eral.

control point to determine the soutée of interference. Moreover, RaySat does not indicate whether ts individual control poitls have the ability to track the location of their terminals or operating parameters. The Commission should require RaySat to submit information regarding the tracking capabiliies of individal control points including logging ofterminal locations, nto the record Application. In the Ea 1 Station on Vessel ("ESV") context, the Commission has required Ku band ESV hub op alrs to have the capability to track and maintain certain dat, including terminal locations, for p |emial review in the event interference issues arise." Tracking capabilities would serv the sme purpose in the LMSS context" | i. mE roINTING ACCUR&CY Or THE SCPC SIGNAL IS INSUFRICIENT TO PREVENT INTERFERENCE INTO ADJACENT SATELLITES Because an antenia using a SCPC modem transmits at relatively narrow bandwidths at high power densitis compared to a spread modem, minor shifts in antenna pointing would significantly impéet power density in a particular direction. Thus, a mispointed individual antenna likely would gnit at power density levels that could cause interference into adjacent satelltes. VieSat do¢s t support antenna pointing requirements for systems using spread spectrum modulation techniques in which individual antennas operate at extremely low * Procedures to Govern the Tse ofSatellite Earth Stations on Board Vessels in the 5925—6425 MHz3700—4200 Miiz Band§ and 14.0—14.5 GHz/11.7—12.2 GHz Bands, Report and Order, 20 FCC Red 674, 9 112 (rellJan. 6, 2003). * Although ViaSat does not sipport a publicly accessible database containing tracked data or public disclosure of aireraftilocations, ViaSat is in favor of a requirement to rack terminal locations to enforce interfergnce protections. See ViaSat, Inc. Comments, Service Rules and Procedures to Govern the Use ofAeronautical Mobile Satellte Service Earth Stations in Frequency Bands Allocated o the Fixed Satellite Service, 1B Docket No. 05—20 at22 (fled July 5, 2005) (ViaSat AMSSP Comments"); ViaSat, Inc. Reply Comments, Service Rules and Procedures to Govern the lse ofAeronautical Mobile Satellite Service Earth Stations in Frequency Bands Allocatedo the Fixed Satellite Service, 1B Docket No. 05—20 at 19—21 (fled Aug. 3, 2005) (‘ViaS& AMSS Reply Comments"). However, the Commission should not require carriers to track@xact antenna pointing angles. 14.

power densites, and where aggreat te power density is controlled by a NMS.* In such systems, antenna pointing requirements are ecessary because a single mispointed antenna operates using a wide bandwidth at power nsity levels that are undetectable to adjacent satelltes. Further, using central power contt 1 to manage the ageregate power density ensures that the power density ofthe networkdoee not exceed the OAED mask, thereby protecting adjacent users. However, RaySat‘s propos 14 system uses an unspread modem, which by definition does not employ these technologies, and thus, pointing errors could result in harmfulinterference. Furthermore, RaySit‘s asserted pointing accuracy is inconsistent with the characteristics and performance l els of a viable service. When the "antenna mechanically mispoints by more than 0.5 degret s, the antenna system will mute the transmit carrier.""" However, the antenna has a point ha error standard deviation of 0.35 degrees."" Therefore, approximately 15 percent ofthe e the terminal will not be operational and will only be able to transmit a signal 85 percent cffxe time."" Thus, the antenna‘s pointing accuracy does not appear to support viable service real—world conditions. See ViaSat AMSS Comment at 17—18; ViaSat AMSS Reply Comments at 11. In such cases, ViaSat believes that the mask and the exceedance table are sufficient to protect adjacent users from interfer ce resulting from mispointed antennas. In the event interference cannot be conti 1 led using spread spectrum and/or power control technology, ViaSat supports reasonable inting accuracy limits. Application at 6. Letter from Ram Manohar, epartment Manager, Intelsat GSC to Federal Communications Commission, at 1, Attached io Application (Feb. 14, 2006) ("The azimuth tracking for these antenns is +/— 0.35 degree iominal and +/— 0.5 degrees maximum."). A zero mean erzor with 0.3 standard deviation results in a pointing error greater than 0.5° 15.33 percent of the time, e Distribution for Pointing Deviation, attached as Exhibit B hereto. ViaSat used comme cially available Monte Carlo simulation software to generate a simulation based on a zero ean error and a 0.35° standard deviation run on 5,000 trals.

IV. RAYSAT SHOULD §UL iT LINK BUDGETS TO SUPPLEMENT 1TS APPLICATION While the propos input power densities in the Application conform to the FCC‘s rules,it is unclear whether| ie antennas using a SCPC modem can close the satellte link while operating atthese power Je Eis. Based on ViaSat‘s calculation of RaySat‘s system link budget, the power density level at vhich RaySat proposes to operate do not appear to be sufficient to close the link from “T remote terminal to the hub antenna even under ideal operating conditions."" Therefore the Commission should require RaySatto demonstrate that it can provide service without cousif i interference into adjacent satellte operations. *\ In its Application, RaySats es that it will use BPSK and R1/3 FEC and thereby occupy 2070 k1z of bandwidth for 1512 kbivs cireuit or 512 kHz for a 128 kbits circuit. Thus, when using a 2 watt power plifier (3 dBW), the input power spectral density to the antenna fange is: 3 dBW — 10 * log (2070 kH kHz2)=—24.1 dBW/A kHz, or 3 dBW — 10 * log (512 knzA KH2)= —18.1 dBwit kite, which is consistent with the power density levels specified in the Application. Even under ideal operating conditions, lor 3 watts is insullicient to close a 128 kbit‘s data link from the remote antenna to the hub. ssuming a 0 dB transponder input attenvation and a 0 dB rain margin,results in a margin —0.436 dB. However, these assumptions do not reflect realisti operating conditiont A system using an SPCP modem typically operates at a transponder input attentiatiof of 6 dB or greater and must employ a constant rain margin. Thus, under these assurpti s the link margin is even lower. See Exhibit A, Link Budget Calculations.

v. concLusion For the foregoing iasons, the Commission should require RaySat to cure the technical deficiencies in RaySat!@proposed operations and to address the potential interference issues identified herein. Until Ra¥Sat resolves these issues, the Commission should not grant RaySat‘s requested authority,; Respectfully submitted, HieabelR R. Park Stefanie Alfonso—Frank LATHAM & WATKINS LLP 555 Eleventh Street, N.W. Suite 1000 Washington, D.C. 20004 Telephone: (202) 637—2200 Counselfor ViaSat, Inc. Filed: August 4, 2006

EXHIBIT A : § s 2 a ;: &

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‘ Distribution for x ..o 3,Dstibution Pointing/Bd tyr Egiptng 1s.scsst sa.1245% ‘ [ttean = 2 «24848€—09 s asts oas iss

Distribution for Pointing!B9 X<=35 X=05 12— 7.e620% s2.3400% _ (iean 1.75720€—05) os os o« o2 is

1hereby certify thitI am the technically qualified person responsible for reviewing the engineering inforiiition contained in the foregoing submission, that I am famior knowledgeand betiof Daryl T. Hunter,PE. ViaSat, Inc. 6133 El Camino Real Carlsbad, CA 92009—1699 Dated: August 4,2006

TIFICATE OF SERVICE 1, Elizabeth R Park, hereby certify that on this 4" day of August, 2006, served a true copy of the foregoing nts of ViaSat, Inc. by first class mail, postage pre—paid upon the following: Bruce A. Henoch Shulman Rogers Gandal Pordy Ecker 11921 Rockville Pike Suite 300 Rockville, MD 20854


Document Created: 2006-08-14 12:18:48
Document Modified: 2006-08-14 12:18:48
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