Federal Communications Commission

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Federal Communications Commission NPRM: NOTICE OF PROPOSED RULE MAKING Amendment of Regulations for Part 15 Spread Spectrum Devices ET Docket No. 99-231 FCC 99-149 Released: June 24, 1999 Comment Date: [75 days after publication in the Federal Register] Reply Comment Date: [105 days after publication in the Federal Register] FCC proposes to amend the Part 15 Section 247 rules regarding the operation of ISM spread spectrum systems. Frequency hopping systems operating in the 2.4 GHz band (2400 - 2483.5 MHz) to allow for wider operational bandwidths. Refine the method for measuring the processing gain of direct sequence systems. Goal: Facilitate development and deployment of spread spectrum technology, particularly for high data rate wireless applications.

Summary of WBFH Proposals

DS Processing Gain Processing gain (PG) shall be > 10dB PG = improvement in SNR after filtering from coding and spreading Today: PG (dB) = SNR with spread on SNR with spread off Proposed Methods: No changes If chip rate > 10 chips/symbol If chip rate < 10 chips/symbol Traditional CW jammer test AND Mathematical calculation of processing gain OR Jamming margin test using Guassian Noise

FCC Invites Comments: (9) FCC does not believe new rules will result in any significant increase in interference to direct sequence spread spectrum systems. WBFH interference on DSSS DSSS can compensate by improving processing gain WBFH interference to Amateur Radio (10) FCC believes that WBFH systems will achieve data rates substantially greater than 1 MHz systems. Effects of multipath interference and subsequent retransmissions (14) The current jamming margin test is based on use of a CW signal as an interference source but propose to use a Guassian interferer. Effect of using a Guassian interferer in the current jamming margin test set-up and detailed measurement procedures. (15) FCC proposes that results of jamming margin test be submitted along with a mathematical calculation of processing gain, if the DS system uses fewer than 10 chips per symbol. Requirements to submit the results of the jamming margin test as well as a calculation of processing gain to verify compliance.

Motion 1 Form a 802.11 WBFH study group (liaison with 802.15) Analyze interference impact on legacy 802.11 systems Report findings/recommendations to 802.11 by Thursday Suggest further actions Motion 2 Form a 802.11 DS Processing Gain study group (liaison with 802.15) Fully understand rule changes Define Gaussian noise source