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' 5 I b      (>)P7_DkRs`ym{{|zvqjb[TMHC?<-:::H:V<c=q@BEHLORUWZ\]_#`0a>bLbYbgbubbbbbaaaaaa aa'a4bBbPc]ckdydeeefffffeeed*c8bFaS`a_o]|\[YWUTRPNLJH F.D<BI@W>e<r:86420.,+)' &$$"2!@ M[iv (6CQ_lz  !"##$$%,%9%G&U&b&p&~&&&&&&&&&& & &" &/ %= %K %X %f %t % % % % % % % % % % % !%!%&!%3!%A!%O!%\!%j!%x!%!%!$!$!$!$!$!$!$!$"$"$"$)"#7"#E"#R"#~  (   ( <<(<((pp(p,,(,((`"`"(`" FP x 0.00000 <pP  2.00E-07 <pP h4.00E-07 <pP 6.00E-07 <pP X8.00E-07 <pP  1.00E-06~` ` `    hhhppp    FP -.40000 FP = -.20000 FP  0.00000 FP .200000 FP M.400000 FP .600000`"`"   P   TIME (us) . jKK                                                                                                                                                                                                                                                                        ڪ                                                                                                                                                                                                                                                                                                                           )((($'')) !\KK                                                       3                                                                                                                                                                                                                                                                                                                                                                                         *                                       +   +  +         +                                      &                                                                                                                                                                                                                                                     &                                                                    *                                                                                                                                                                                                                                                                                                                                                                                                                                                        +++'**,,  `ibfae afaeac ag afmm+  yxdddy *   yO: #\\  PRu\P#Printed: September 4, 1991'Page `T(#<File: 11QAM194+   XX  $ ` #\  PButHP#SEPT 1991`,(#3DOC.: IEEE P802.11/91 98 ă    yxbdddy  <  yxXdddy *   yO: #\\  PRu\P#Printed: September 4, 1991'Page `(#+QAM/NRZST RF ModulationRypinski<  Y   #2P'P#$ IEEE P802.11 ă 802 LAN Access Method for Wireless Physical Medium #Xl2P0kXP#yx dddy DATE: ` ` July 5, 1991`(#,Last revised: September 4, 1991  l yx dddy TITLE: ` `  RF MODULATION PROPOSAL: ` ` QUADRATURE DOUBLE SIDEBAND REDUCED CARRIER ` ` WITH TWO NRZST BASEBAND CHANNELS yxdddy  l  AUTHOR: ` ` Chandos A. Rypinski, Chief Technical Officer ` ` LACE, Inc.`(#3Telephone: 707 765 9627 ` ` 921 Transport Way`-(#2Facsimile: 707 762 5328 ` ` Petaluma, California 94954 USA yxdddy SUMMARY A two part modulation is offered for consideration which consists of: 1) updown conversion between baseband and QAM modulated radio frequency, and 2) I and Q channel smoothed (or sinusoidal transition) NRZ baseband modulation. The resulting radio signal resembles QPSK (two superimposed PSK) retaining polar detectability and but without outofband components that are generated by nonlinear methods. This modulation is thought suitable for spread spectrum at a 3040 Mb/s chipping rate or for other code forms at higher rates. The required radio is linear with a spectral density of 2 bits/Hz. In the processing details, this form may have significant advantages for this application. For reduced cost and powerdrain, only one of the two available quadrature phased channels may be used resulting in simpler PSK. Attachment A is an edited and condensed version of the January 1990 paper presenting NRZST to IEEE 802.9 for use at 16 Mbs (20 Mb/s with 4/5 line coding).  .****DD  Table of Contents``!(#GPageă    GENERALp6"(#H 1 XContext p6"(#H 1 XAssumptions p6"(#H 1 XPropagation p6"(#H 1 DESCRIPTIONp6"(#H 1 XBaseband Waveform p6"(#H 1 XUp Conversion p6"(#H 1 XCarrier Insertion p6"(#H 2 XDown Conversion p6"(#H 2 X SPECTRUM REQUIREMENTS p6"(#H 2 RADIO DESIGN CONSIDERATIONSp6"(#H 3 XReceiver AGC Method p6"(#H 3 XCarrier Recovery Methods p6"(#H 3 XSystem Frequency Matching p6"(#H 3 $ATTACHMENT A NONRETURN TO ZERO SINUSOIDAL TRANSITION MODULATION ă BACKGROUND AND NOTESp6"(#H 4 GENERAL DESCRIPTIONp6"(#H 4 XGeneration of a Binary Line Signal with Consecutive  Overlapping Pulsesp6"(#H 4 XPulse Shape for Distortion Free Medium p6"(#H 5 XCharacterization of the Medium By Impulse Response p6"(#H 5 XConvolution and Deconvolution p6"(#H 5 DESIGN AND SYNTHESIS OF THE TRANSMIT LINE SIGNALp6"(#H 6 XAssumptions About Ancillary Functions and Signaling Data Rate p6"(#H 6 XFinite Impulse Response (FIR) Pulse Shape Formation p6"(#H 6 XTransmit Pulse Shape p6"(#H 6 RECEIVER BANDLIMITINGp6"(#H 7 REFERENCESp6"(#H 8 FIGURES X` hp x (#%'0*,.8135@8: