ÿWPCr  ûÿ2úÿÿBJ Z ÿÿúCourier#|xñ6Ûxþ6X@ÉüKX@þþþþþþþÿþÿÿÿþÿÿþÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿApple postscriptHPLAIIP0.PRSXx Œ ‘@ɇÏhhhhðýƒmX@ûÿ2ÿÿ,ÿÿN%^X¸CourierTimes Romanes (Scalable)#|xCourierTimes RomanTimes Roman BoldHPLASIII.PRSXx Œ ‘@ɇÏ,\,ðœíZX@Tÿÿ‰?xxx°ñ6Ûxþ6X@ÉüKX@þþþþþþþÿþÿÿÿþÿÿþÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ‚‘7oC2°boô\  PŽÂCXPþþþþþþÿþÿÿÿþÿÿþÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ‚¯A…P<°E‚…ô\  PŽÂCÐPþþþþþþþÿþÿÿÿÿÿþÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÀÿÿ¯A‹P<°–W‚‹ô4  pŽ(ACÐþþþþþþþÿþÿÿÿÿÿÿþÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿûÿ2òBLBÿÿ@LŽ"‚ÿÿÿÿSÿÿ£ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ^2CRdd§œCCCdq2C28dddddddddd88qqqY¸……zoCNz²o…oz½zC8C^dCYdYdYCdd88d8œddddCN8ddddY`(`lÏC2CCÈ!CCCCCCCCCCd8YYYYY²……YzYzYzYzYC8C8C8C8ddddddddddYddddodYY…Y…Y…Y…YdzYzYzYzYddddddCdCdCCCdNCdz8zCzCz8ddddd²…C…C…CoNoNoNoNzCzCdddd½dzYzYNF2[dCYddddd7>––d<˜˜d–<$YYdÈCCddÄooÈCYÈÁ Bob Achatz, NTIA Õ ÁàÐ ÁThe Natural and Man©Made Noise Environments inƒ ÁàˆÁPersonal Communication Services Bandsƒ Áài%ÁRobert J. Achatzƒ Áà@ ÁU.S.Department of Commerceƒ Áà" ÁNational Telecommunications and Information Administrationƒ ÁàvÁInstitute for Telecommunication Sciencesƒ ÁàÆ'Á325 Broadwayƒ Áà" ÁBoulder, Colorado 80303 USAƒ Áàº!ÁTelephone: (303) 497©3498ƒ Á44ÁThe physical layer working group of IEEE 802.11 has been discussing the multipath characteristics of the indoor channel for some time. The Institute has prepared two submissions which have reported the results of multipath measurements for office (IEEE P802.11©93/41) and warehouse (IEEE P802.11©93/112) environments. The office measurements have been made available for use by the IEEE 802.11 standards committee for a nominal fee. Á44ÁThe other component of the indoor channel which has not been widely discussed is its additive noise characteristics. Dr. A.D. Spaulding at the Institute has written a report entitled "The Natural and Man©Made Noise Environment in Personal Communications Services Bands" that addresses the additive noise problem. This report is in final review, however to expedite the standards process, a draft version is available upon request. The abstract to the report is as follows: Á44ÁThis report presents a summary of the available measurement information on the level and statistical characteristics of the background noise environment in the frequency range 1©3 GHz. The frequency range covers the proposed frequencies for the new personal communications services. Both natural and man©made unintentional radiations are covered , both the general overall background and noise for individual sources. The urban noise environment in this frequency range is due primarily to automotive ignition systems. The noise is non©Gaussian in character, but not highly impulsive. Á44ÁIEEE 802.11 standards committee members who would like more information on the Institute's indoor channel multipath measurements or a copy of Dr. A.D. Spaulding's report should contact Robert Achatz at the above address or phone number.