ࡱ> #%` 0F]bjbjٕ pg vvv8\HD .^xx%b%$%2.4.4.4.4.4.4./h2b4.9v$'$|%$'$'4.x m.+++$'$lx:&82.+$'2.++,^+ %lyH(x+N-.0.+}3)}3+}3v+%>%,+"&$F&%%%4.4.V+d%%%.$'$'$'$' $   IEEE P802.22 Wireless RANs IEEE 802.22.1 Fades and Interference from IEEE 802.22 NetworksDate: 2008-02-01Author(s):NameCompanyAddressPhoneemailStephen KuffnerMotorolaSchaumburg, IL847-538-4158Stephen.Kuffner@ Motorola.com  Average Channel Gain over a Bandwidth For a given mulitpath model, the ratio of the fade in the TG1 transmitter-to-WRAN sensing receiver path F!, integrated over the TG1 77kHz channel bandwidth, can be compared to the maximum upfade F! (integrated over the microphone receiver bandwidth of 200kHz) in the WRAN transmitter-to-microphone-receiver path. It should be noted that this comparison is dependent on the channel model, in particular the order of magnitude of the delays. Figure 1 shows a plot of a channel using WRAN model B [1] with the nominal delays (randomized by a perturbation between 100 ns to remove frequency domain periodicity). The blue curve shows a channel response for a given draw of the ray random phases for the nominal delays, while the red curve shows the channel response for a given draw of the ray random phases for 1/5th the nominal delays. The bright green lines show the regions of integration for the 77kHz-wide TG1 channel (beacon BW) and one of the 200kHz-wide regions for determining the maximum upfade. As can be seen, the longer (nominal) delay spreads result in much finer grain frequency variations and hence averaging over a given bandwidth will reduce the extremes due to smoothing, while for the shorter delays (nominal/5), there will be less smoothing, hence one can expect greater extremes. This is in fact shown in the statistical analysis in Figures 2 and 3.  Figure 1. Example channel responses for the nominal WRAN channel B (blue) and channel B with delays scaled by 1/5th (red).  Figure 2. Averaged channel gains vs. trial number. Note this is not channel gain vs. frequency. The blue line is the TG1 77kHz-averaged channel gain, the red the maximum of all of a TV channels 200kHz bandwidth averaged channel gains. Note the TG1 gain can exceed the maximum 200kHz channel gain since it averages over a narrower bandwidth and so applies less smoothing to larger narrow peaks.  Figure 3. Average channel gains vs. trial number with nominal channel B delays divided by 5, giving more extreme max values and fades. The average channel gains above are calculated as  EMBED Equation.3 , where  EMBED Equation.3  and  EMBED Equation.3 , where the hi are the power-normalized WRAN B ray magnitudes. The B is the averaging bandwidth; for the TG1 channel B = 77kHz and for the interference channel B = 200kHz. Figure 5 compares the TG1 77kHz averaged fade depth to the cumulative density for a true flat Rayleigh fade ( EMBED Equation.3 , where F is the fade depth in dB). There is about 4dB difference at the 5% points.  Figure 4. Depth of TG1 fade for channel B profile averaged over the 77 kHz beacon bandwidth.  Figure 5. Cumulative density for depth of averaged TG1 WRAN-B fade compared to true Rayleigh flat fade.  Figure 6. Ratio of TG1 fade to max interference channel gain for nominal delays. Five percent of the cases have a ratio greater than 11.2dB, while 1% have a ratio greater than 15.7 dB.  Figure 7. Ratio of TG1 fade to max interference channel gain for nominal delays divided by 5. Five percent of the cases have a ratio greater than 15dB. As was shown in Figure 1, the shorter delay spread condition leads to more slowly varying (over frequency) channel responses and more extreme differences in average channel gain, by about 4dB for the WRAN channel B nominal T vs. T/5 condition analyzed here. Use of the Statistics How these statistics relate to the protection of low power secondary licensed devices requires further consideration. It is not simply the probability of a fade of a certain depth that will really matter here. For example, if it is 1% PER that is required at the WRAN sensor, then many combinations of probability of a fade and probability of a packet error could result in 1%. For example, if the channel was a simple two-state channel, faded by 15dB 10% of the time or 0dB the remaining 90% of the time, a nominal SNR of 20 dB would give 5dB SNR 10% of the time and 20dB SNR 90% of the time. If the PER at 5 dB SNR was e.g. 10% and the PER at 20dB SNR was e.g. 0.01%, then the expected value of the PER would be 10% x 10% + 90% x .01% = 1.009% so in this case a 10% PER in the faded condition is adequate for 1% average PER. Instead of having the simple two-state channel as described in the preceding paragraph, the actual channel occupies a continuous density. What is required then is to find the nominal SNR value SNRnom that satisfies the following equation:  EMBED Equation.3  (1) where X is the random variable for the SNR and p(X | SNRnom) is the probability density of the faded SNR given the nominal SNR. Note this simple analysis does not account for any ISI that may be present due to the faded channel frequency response. This simple analysis is only valid for flat fading. The required value for the average PER needs to be defined to enable determination of the nominal SNR. For the simple two-state fading channel example above,  EMBED Equation.3  (2) Equation (1) is a complicated integral to solve in general, but it need not be solved at all because this is essentially what the fading channel PER simulations do, and they further account for ISI that is not accounted for by a simple flat fading analysis. The PER simulations give the average PER for a given SNRnom over many random draws of the channel, some percentage of which are 10dB fades, some percentage of which are 20dB fades, etc. Thus, the WRAN channel B PER simulation results for MSF2 (the longest unprotected packet) show below in Figure 8 that 17.6dB chip SNR (26.6dB symbol SNR) is required for SNRnom to satisfy 1% average PER. Non-faded PER results for all packet types using the frame structure from the most recent draft standard are shown in Figure 9 for reference [3]. Conclusion While the statistics for the averaged channel gain over the bandwidth of the beacon can be determined, these statistics do not necessarily reflect the performance of the channel since they imply flat fading that does not account for intersymbol interference.  Figure 7. PER vs. chip SNR for AWGN and WRAN B for uncoded MSF2. There is a 12.8dB difference between AWGN (4.8 dB) and WRAN B (17.6 dB) 1% PER chip SNR values. An Ec/No of 22.5 dB is required for the flat Rayleigh channel. Based on 100 packet errors.  SHAPE \* MERGEFORMAT  Figure 8. AWGN PER for various TG1 packets (from [2]) based on the most recent draft standard [3]. The 51-octet uncoded MSF2 is the worst case, shown here requiring about 5.5dB for 1% PER; note there is about a 0.7dB difference from the 4.8dB of Figure 7. References [1] IEEE 802.22-05/0055r7, WRAN Channel Modeling, E. Sofer, G. Chouinard, 30 Aug 2005. [2] IEEE 802.22-08/0zzzr0, Simulation Results for TG1 According to Draft 2.0, Wu Yu-chun, Jan 2008. [3] P802.22.1/D2, Part 22.1: Enhanced Protection for Low-Power, Licensed Devices Operating in Television Broadcast Bands, October 2007.      KEYWORDS \* MERGEFORMAT February 2008  TITLE \* MERGEFORMAT doc.: IEEE 802.22-08/0058r0  SUBJECT \* MERGEFORMAT Submission page page 1  COMMENTS \* MERGEFORMAT Stephen Kuffner, Motorola Notice: This document has been prepared to assist IEEE 802.22. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEEs name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEEs sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE 802.22. Patent Policy and Procedures: The contributor is familiar with the IEEE 802 Patent Policy and Procedures < HYPERLINK "http://standards.ieee.org/guides/bylaws/sb-bylaws.pdf" http://standards.ieee.org/guides/bylaws/sb-bylaws.pdf>, including the statement "IEEE standards may include the known use of patent(s), including patent applications, provided the IEEE receives assurance from the patent holder or applicant with respect to patents essential for compliance with both mandatory and optional portions of the standard." Early disclosure to the Working Group of patent information that might be relevant to the standard is essential to reduce the possibility for delays in the development process and increase the likelihood that the draft publication will be approved for publication. Please notify the Chair < HYPERLINK "mailto:carl.stevenson@ieee.org" Carl R. Stevenson> as early as possible, in written or electronic form, if patented technology (or technology under patent application) might be incorporated into a draft standard being developed within the IEEE 802.22 Working Group. If you have questions, contact the IEEE Patent Committee Administrator at < HYPERLINK "mailto:patcom@ieee.org" \t "_parent" patcom@ieee.org>. Abstract The statistics for the average fade over the 77 kHz TG1 bandwidth, compared to the maximum interference gain from a WRAN device into a microphone receiver, averaged over all 200 kHz microphone receiver subchannels within a TV channel, are determined using the WRAN channel B power/delay profile. For 95% of the cases, the beacon channel is faded less than 11.2 dB relative to the maximum interference channel, while for 99% of the cases the beacon channel is faded less than 15.7 dB relative to the maximum interference channel.Y[`bfghijlmnyz |  8FJP hy(Rh6hi1hhH*hhdhdH*hdhdH*hdhd6h^hzf hDCJjhDUmHnHu hD5CJ hd5CJ hB5CJ hd5CJ hD5CJ hDCJhdhD2Z[m~ $If^dkd$$IfTl$h%04 laT$If &dP%&@]E]mnyz!ekd$$IfTl4$h%04 laf4T$$If]^a$dkd$$IfTlg$h%04 laTz=kd$$IfTlr $8 o04 laT$$If]^a$@kd~$$IfTlr $8 o04 laT$If]^ {|~9:$a$gd9$a$gd egdy7$a$gdy(R$a$gdgddgddx su)01;IJ[\eqrƾƾ¾ƮƪƪƪƦƪƞy)jA[K h3|CJUVmH nHsH tHjhy7Uhhy7j0hy7UhtYhZh=hy(R6h=h=6h=hhy(Rjyh=U"jhUmHnHsH tHuhhH*j\hUhdhh2F. !"#$,012bcehi@BCV毢Ꞛ|xpxjhDMUhDMhZhh6h2Fh2F6H*h2Fh2F6h2Fhj]Hhy7hvFEHU)jl[K hvFCJUVmH nHsH tHjEhy7hvFEHU)jc[K hvFCJUVmH nHsH tHhy7jhy7UjBhy7h3|EHU#VWXYabtz{JQ{|}~ "79:;CDGL}}umh2Fh6j}hZUh!MhC@,hZh2Fh96h9hjyoh!MUhh3|jX\hvFUh ejMh eUhy7hZh2FhDMhDM6hDMjhDMUjLKhDMhDMEHU)j-ZK hDMCJUVmH nHsH tH*:<67'(EF45V!W!b!g"i"$a$gdBgd]/gd ugdIE `'gduomgdzfgdy7$a$gdLYz}2C IJKgl!456MTs&'(hk h?hIE hIE hIE 6H*hIE hIE 6hIhIE huomh]/h?hBhghzfhCh2Fhf hh9hh9hZh?()*=>?@DELMNmpuvwxy{~tu±𾶾𔐈|xthhhBh]/hRhBh 26h 2 h 2h 2hJhJ6H*hJhJ6hJ hJ6hJh$6h$hIE hIE 6hkjhIE hJEHU)jTK hJCJUVmH nHsH tHhIE jhIE Uhuom,,-./345Adoq58mps% O Y d e f m n o  ƾƲƶƪšƌˆˆˆˆšhC+hzfhO^h\zhHj<hHj<6H*hHj<hHj<6hghHj<6hghB6hhZhghIhHj<hBjh uh]/EHU)j`[K h]/CJUVmH nHsH tHh 2jh 2Uhuomh u2 !A!B!P!T!U!V!W!g"h"p"q""""""""""" #i#j#k################$$$($E$F$G$H$T$[$]$$$$$ȲĦĦĢĞООhBh$h$j'h|GU"jh|GUmHnHsH tHuh|Gjh|GUhC+h@j˓h\Uh]/hDh uhzfh\zh#hO^hHj<=i"j##$$$$Z%%%%%%%%%%R&S&&&&&  PH`'gde  PH`'gde 0^`0gd3tgd3tgdy7$a$gdB$$$$$$$$Y%[%\%%%%%%%%%%%% & &&&&&4&5&P&Q&S&T&m&n&x&y&&&&&&&&&&&&&&&&-(¾º¾¾¶¾¾º¾¾­¾¾º¾ʡhDB*CJphhD5B*CJphh mHnHuhehghDjhDUh jh U hdhihhA/h$hih3th 5CJOJQJh 25&-(.(_*`**>/?/H/<]=]>]?]@]A]B]C]D]E]F] 0^`0gd3t$a$gddgdBx7$8$H$$a$-(.(6(`*}*****+++F+G+-------.ոteOtCthQhD0J5CJ+jhQhD5B*CJUphhQhD5B*CJph%jhQhD5B*CJUphhQhtul0J5CJ+jhQhtul5B*CJUphhQhtul5B*CJph%jhQhtul5B*CJUphhtulB*CJphhDB*CJphhD5B*CJph'hDB*CJOJPJQJmH phsH ...*/+/:/;//H/u//////010H0L0Z0n000Y1\\\\\\\]]];]<]=]>]E]F]ÿ÷ïëëëÿéǥǞ hdhihuomUh;@h;@hB6huomhB6h^hBhD hDCJhDB*CJphhD0J5CJjhD5B* CJUphhD5B* CJph) The utility of these statistics is still to be determined, since they do not reflect degradations in beacon sensitivity due to ISI from frequency selectivity over the beacon bandwidth. Lastly, the average PER is identified as a parameter that needs to be defined and determined. One definition is proposed here. 50?&P:pD/ =!8"8#8$8% FFbw&%ԖHJFIFC    $.' 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'% LdK5PK!??% " Rp@Times New Roman- 00O- 0G:Ax Times ew Roman+ 0Pˮ0c7j0LN0dv%  T8lF@vb@ L`Submission822N''21TT8lF@vb@LP GTl8 lF@vb@LXpage 2,2,TT 8 lF@vb@ LP13TT 8 lF@vb@ LP T 8*lF@vb@ LStephen Kuffner, Motorola8,22,2H2!!2-!Y22!3,TT*8VlF@vb@*LP -! % Ld)5.)!??% " Rp@Times New RomanG:Ax Times ew Roman@6j0LN0dv%  TTlF@vb@LP ) % TS GlF@vb@. LdIEEE P802.22.NNNG::;:;TTT  GlF@vb@T .LP J T|Io lF@vb@| LhWireless RANsu!43!3..TTT.TTp I lF@vb@p LP >! % Ld5!??% "  Tm>lF@vb@m6L-IEEE 802.22.1 Fades and Interference from IEEE 802.22 .NNN;:;:;;G;A3.;AA.A'43'444@44&4;`.NNN:;;:; T|  HlF@vb@ /L-\NetworksT4&U;4?.TT  HlF@vb@ /L-P < % Ld)9,<)9!??%  % Ld)9,<)9!??%  % Ld-9<-9!??%  % Ld9<9!??%  % Ld9<9!??%  % Ld)=,)=p!??%  % Ld==p!??% Rp@Times New RomanG:Ax Times ew Roman..@j0@LN0Xdv% Rp@Times New Roman- 0\ˮ0O- 0G:Ax Times ew Roman+ 0Pˮ0c7@j0@LN0Xdv% %  Tl' lF@vb@'L-XDate:<*%% TX lF@vb@L-P Td  lF@vb@ L-T2008)***TT  lF@vb@ L-P-TT  lF@vb@ L-P0*TT ) lF@vb@ L-P2*TT* D lF@vb@* L-P-TXE  lF@vb@E L-P01**% TT  lF@vb@ L-P ) % Ld),)!??%  % Ld--!??%  % Ld!??%  % Ld),t)!??% &" WMFC @@ % Ldt!??%  TX{lF@vb@X L-`Author(s):<..*% TT{lF@vb@L-P * % Ld)u,x)u!??%  % Ld-ux-u!??%  % Lduxu!??%  % Ld)y,)y`!??%  % Ldyy`!??%  TdX&;lF@vb@X*L-VTName<+C%TT'Q;lF@vb@'*L-VP + Tx;lF@vb@*LZ\Company<+D.*.*TT ;lF@vb@*LZP * Tx ;lF@vb@*LF \Addressx<..%%! 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LJ P-jaT`Z r lF@vb@Z LJ T538es***TT r lF@vb@ LJ P-ctTd rlF@vb@ LJ T4158**)*TTrlF@vb@LJ P or)Rp@Times New RomanG:Ax Times ew Roman..@j0@LN0Xdv%  TnTvlF@vb@nLpStephen.Kuffner@ tt%""!/""> T'lF@vb@ LdMotorola.com<!!!!4TT(IlF@vb@(LP T " % Ld)=,@)=!??%  % Ld-=U@-=)!??%  % LdV=Y@V=!??%  % LdZ=@Z=X!??%  % Ld=@=!??%  % Ld=E @=!??%  % LdF =I @F =!??%  %&" WMFC @d@ LdJ =@J =!??%  % Ld=@=!??%  % Ld=@=!??%  % Ld=@=!??%  % Ld)A,)A!??%  % Ld),)!??%  % Ld),)!??%  % Ld-U-)!??%  % LdVAYVA!??%  % LdVYV!??%  % LdZZX!??%  % LdAA!??%  % Ld!??%  % LdE !??%  % LdF AI F A!??%  % LdF I F !??%  % LdJ J !??%  % LdAA!??%  % Ld!??%  % Ld!??%  % LdAA!??%  % Ld!??%  % Ld!??% Rp@Times New Roman- 0i0O- 0G:Ax Times ew Roman0+ 0Pˮ0c7j0LN0dv%  TT ' mlF@vb@ ZLP 2Rp @"Arial- 0i0O- 03& :Cx Arial+ 0Pˮ0c7j0LN0dv%  Rp @"ArialmlDldk '0,,4  X=,,X"0,,چUS0.3& :Cx Arial ' (i(/uj$j0LN0dv% F(GDIC!b $$>>% % V0a/aY;QCY;QC/a/% % $$@@" FGDIC! % T|] /lF@vb@]L\AbstractTA.'4:4'TT M /lF@vb@ LP >% Rp @Times New Roman- 0\ˮ0O- 0G:Ax Times ew Roman+ 0Pˮ0c7j0LN0dv%  % T\clF@vb@-LThe statistics for the average fade over the 9.($)#($..))-))-))-).-).)Tc lF@vb@Lx77 kHz TG1 bandwidth, ..-B(9B-.)..B-.T c lF@vb@ Llcompared to the ).F.))..-)% Tx c[lF@vb@ L\maximumB.)B.B% TT\cqlF@vb@\LP  % T( 4 lF@vb@ OLinterference gain from a WRAN device into a microphone receiver, averaged over .))).))-)..F)W=BB.)-))-.)F)-.-..)))(-))-))-)..-)% T` 4 lF@vb@  LTall.% T~4 lF@vb@ L` 200 kHz ...-B( TX6 4 lF@vb@ LPmiFT56  lF@vb@5 Lcrophone receiver subchannels).....))()-)#..)-)..)$T6 lF@vb@ Lt within a TV channelB..)8C)-)..(T 6 lF@vb@ L|, are determin&" WMFC @D@ed using )).))F.).-$.-Td 6 q lF@vb@ LTthe .(Tr 6  lF@vb@r LhWRAN channel BW=BB).)..(=TT6 ( lF@vb@ LP  T  lF@vb@ Ltpower/delay profile..B).))-..)T@ : lF@vb@ SL. For 95% of the cases, the beacon channel is faded less than 11.2 dB relative to 3--.M--))($)$.(.)().-).).-)$).)-($$.).....=)(-). T `p lF@vb@[ Lthe maximum interference chan.)F).F/F.)().()).).Ta p lF@vb@a[ Lnel, while for 99% of the cases.(B-(-.-M..))($)$T` + p lF@vb@ [ LT th.T$, Dp lF@vb@, [ $Le beacon channel is faded less than )-))(..)-)..(#)-).)#$-). Tr lF@vb@ 5L15.7 dB relative to the maximum interference channel.....=)(-).-)F).F/F.)()-))(.)..(Tt r  lF@vb@ 1L The utility of these statistics is still to be 9-).-..($)#($($$$..) T C lF@vb@. cLdetermined, since they do not reflect degradations in beacon sensitivity due to ISI from frequency .)(F.).#.)(-)-....))(.)-)-)..$.-())..#).#--..).4 .F)..)-)- T<E  lF@vb@ (Lselectivity over the beacon bandwidth. $)()--.-)-).)()...)..B-.TE  lF@vb@ L`Lastly, t7)$-T`E ! lF@vb@ LThe .)Tx" E = lF@vb@" L\average)-))-)Tl> E  lF@vb@> LX PER 38=T E  lF@vb@ "Lis identified as a parameter that $-).)-)$)-))F)).(TpE  lF@vb@ LXneeds -)).$ Td a lF@vb@ LTto b..TXb  lF@vb@b LPe )T f lF@vb@ Lddefined and -).)-)..Tg  lF@vb@g Lddetermined.-))F.(.T  lF@vb@ "L One definition is proposed here.B.).(-..$-..-#)..()TT  lF@vb@  LP (" F(GDICr)!b $$>>% % V0z aAa^}D^}DAaA% % $$@@: $$>>_8 88 C% % V,M/kaAa^}D^}DA% % $$@@( : " FGDIC!Rp @Times New RomanG:Ax Times ew Romanj0LN0dv% Rp @Times New Roman- 0\ˮ0O- 0G:Ax Times ew Roman+ 0Pˮ0c7j0LN0dv%  %  TxlF@vb@L\Notice:6%!!% Ti lF@vb@6L This document has been prepared to assist IEEE 802.22-&&&!&9!&&!&!!&&!&!!&&!...&%&&&Tj lF@vb@j DL. It is offered as a basis for discussion and is not binding on the &!!&!!&!&&!&&&!&&&&&%&&%&&&  T<LlF@vb@;}LHcontributing individual(s) or organization&" WMFC @$@(s). The material in this document is subject to change in form and content after !&&&&&%&%%&&!&&%!&!!&&-&!:!!!&&&&!&9!&&&!!&!&!&%!&&:!&&!&&!&!! TOlF@vb@?Lfurther study. The contributor(s) reserve(s) the right to add, &&!&&$-&!!&&%&&!!&!&!%&%!&%TTOIlF@vb@,Lamend or withdraw material contained herein.!9!&&&5&&!59!!!!&&!&!&%!!&TTJOklF@vb@JLP "Rp"Arial Unicode MSI&??Arial nicode MS@7j0LN0dv%  TTlF@vb@LP ( % T|%ylF@vb@jL\Release:6!!%!% T'{lF@vb@jxL< The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, -&!!&&&&&%!&!"!!%&!!&!!!&!&&!...&&!&&&!!9!!!!&&!&!&&& &&&%%& T8~ lF@vb@RLand any modifications thereof, in the creation of an IEEE Standards publication; t!&&!&$9&&!!&&&!!&%&!!!!&&&!&...* &&!&&%&!!%&T< ~lF@vb@ (Lo copyright in the IEEE s name any IEEE &!%&$%&&%!...&!9!!'$... T4(lF@vb@|LDStandards publication even though it may include portions of this contribution; and at the IEEE s sole discretion to permit *!&&!&&%&!!%&!%!&%&%%&9"$&!&&!&&%&&%!&&&&%&!%&!&!...&!&!!%&%&!9 Tt*? ~lF@vb@m\Lothers to reproduce in whole or in part the resulting IEEE Standards publication. The contr&&!&!&%&&!!&5&&!&&&!&!!&&%...*!%&!&&%&!!%&-&!!&&T@ *~lF@vb@@ mLibutor also acknowledges and %%&!&!!%&&5!&%"!&& T lF@vb@ALaccepts that this contribution may be made public by IEEE 802.22.!!!!&&!&!%&&&%&9"%&!9!&!&&&!&$...&%&&&TT  lF@vb@ LP " TT+lF@vb@LP " % T+lF@vb@pLPatent Policy and Procedures:.%!).%!&&*).!%!"*)!"% T-lF@vb@pLL The contributor is familiar with the IEEE 802 Patent Policy and Procedures -&!!&&%&&"9!5&&!...%&%+!!&*&!$!&&+%!!&&!TT-lF@vb@pLP " % TTlF@vb@LP<*Rp@Times New Roman(! 62d!+ 0Pˮ0c7(c70(c7&0c7G:Ax Times ew RomanHőilj0lLN0dv% %  THElF@vb@*Lhttp://standards.ieee.org/guides/bylaws/sb))&)*%")!"!%!&&)*")&%8)TTF^lF@vb@FLP-T_lF@vb@_ L`bylaws.p&" WMFC @@df)&$8))'% Ld!??% ( %  TlF@vb@AL>, including the statement "IEEE standards may include the known *&!&%&%&!!"9!&...!&&!&:"$&!&&!&!%&&5& T)-lF@vb@xL<use of patent(s), including patent applications, provided the IEEE receives assurance from the patent holder or applican&!&&!!&&!&&&%&!!&!&&!!%&&&%&!&&!.-.!!!%"!&!&!!'9&!&!!&%&&!&!%&!!&Tx*-lF@vb@*L\t with 5% TT0lF@vb@sLPrespect to patents essential for compliance with both mandatory and optional portions of the standard." Early disclosure to the !&!!&&!!&!!&!&!'9&!&!!5&&&&9!&&!&$!'&&&%&!&&%&&&!!&&!&.!$&!&&!&%  TlF@vb@xL<Working Group of patent information that might be relevant to the standard is essential to reduce the possibility for deF&%&%5&&&&&!!&&&:!&&&!9%&&!!"%!&&&!!&&!&!!&!&!&&!!&!&&&$&&!T|lF@vb@L\lays in "%& TL0lF@vb@LLthe development process and increase the likelihood that the draft publication will be approved for publication. Please notify &!&!%!&&9!&&&!!!&&&!!!!&!%!&&&&&!&!&!&&%!!%&5&!!&&&%!&&&&%!!%&+!!!&&% % T23lF@vb@u Ldthe Chair <&!2&!*%  T40wlF@vb@4uLpCarl R. Stevenson6%!6*!%")&)'% Ld4}w4}D!??% ( %  TTx2Z lF@vb@xu,L> as early as possible, in written or electr*"!!$"&&&!&5!&&!!!T[ 2lF@vb@[ u7Lonic form, if patented technology (or technology under &&!&9&!!&!&!!&&%&%$&!!&&&&%$&&&  % TlF@vb@vL8patent application) might be incorporated into a draft standard being developed within the IEEE 802.22 Working Group. &!!&!%&!!%&9%&& &!&&&!!%&&!&!!&&!%&!%%&!%!&&!&5&%&!..-%&%&&F&%&%5&%&%  TxlF@vb@L\If you &%)  %  T 4lF@vb@%DLhave questions, contact the IEEE Patent Committee Administrator at <)&%!*)"&)!&)&!)!232.%!)6'>=!!6+=)"%%!%+%  T  4lF@vb@ %Llpatcom@ieee.org)%"&=F"!!%!&'% Ld - 3 -*!??% (  TT  4lF@vb@ %LP>+%  TT , 6lF@vb@ %LP.TT- N 6lF@vb@- %LP "" % ( 666666666666666666666666&bWMFC@@6666666666666 6 66 6  6 66 6  6 66 6  6 66 6  6 66 6 66666666666666666666  d.@Times New Roman- 2 #6 cFebruary 2008 2 #c 2 #c b%2 #cdoc.: IEEE 802.22  2 #c-2 #c08/0058r 2 #&c0 2 #-c ,c- @ !(4-'@Times New Roman-2 6 cSubmission  2 nc 2 cpage 5 2 )c1 2 /c |12 cStephen Kuffner, Motorola   2 -c ,c- @ !4-'@Times New Roman- 2 6c -2 C cIEEE P802.22   2 C[c 2 S cWireless RANs  2 S_c ,c- @ !V4-'\2 p6C IEEE 802.22.1 Fades and Interference from IEEE 802.22     2 C Networks   2 NC  - @ !cB-- @ !cB-- @ !cC-- @ !c -- @ !c -- @ !,dB-- @ !,d -@Times New Roman-@Times New Roman--2 C Date:r-2 C  2 C 2008 2 *C - 2 .C 0 2 3C 2 2 8C -2 ;C 01- 2 EC  - @ !B-- @ !C-- @ ! -- @ !B-- @ ! -2 H C Author(s): 2 uC  - @ !B-- @ !C-- @ ! -- @ ! B-- @ !  -2 HCName 2 aC 2 Companys 2  2 xAddresss 2 x 2 ~yPhones 2 y 2  emails 2   - @ !B-- @ !BC-- @ !-- @ !g-- @ !-- @ !-- @ !x-- @ !Uy-- @ !-- @ !R-- @ ! -- @ ! B-- @ ! -- @ ! -- @ ! x-- @ ! -- @ !  --2 TCStephen 2 TCKuffner  2 tC 2 Motorola  2   2 xSchaumburg, IL 2 Sx 2 y847o 2 y-2 y538o 2 y-2 y4158 2 y @Times New Roman-%2  Stephen.Kuffner@ 2   Motorola.com 2   - @ !B-- @ !BC-- @ !-- @ !g-- @ !-- @ !-- @ !x-- @ !Uy-- @ !-- @ !R-- @ ! -- @ !B-- @ !B-- @ !B-- @ !BC-- @ !-- @ !-- @ !g-- @ !-- @ !-- @ !-- @ !x-- @ !x-- @ !Uy-- @ !-- @ !-- @ !R-- @ ! -- @ ! -- @ ! -@Times New Roman- 2 1c @"Arial- @"Arial- -- $111- -',1-2 1Abstract  2 51 -@Times New Roman- -O2 8-1The statistics for the average fade over the ,2 177 kHz TG1 bandwidth, #2 c1compared to the - 2 1maximumt- 2 1 -2 8O1interference gain from a WRAN device into a microphone receiver, averaged over  - 2 1alli-2  1 200 kHz 2 %81mi 72 %D1crophone receiver subchannels)2 %1 within a TV channel.2 %(1, are determined using 2 %1the  2 %1WRAN channel B  2 %1 (2 281power/delay profilei2 2S1. For 95% of the cases, the beacon channel is faded less than 11.2 dB relative to  72 >81the maximum interference chan   :2 >1nel, while for 99% of the cases 2 >K1 th A2 >W$1e beacon channel is faded less than [2 K85115.7 dB relative to the maximum interference channel. U2 K(11 The utility of these statistics is still to be n2 X8c1determined, since they do not reflect degradations in beacon sensitivity due to ISI from frequency  G2 d8(1selectivity over the beacon bandwidth. 2 d 1Lastly, t2 d 1he 2 d1averaget2 d:1 PER g>2 dT"1is identified as a parameter that 2 d1needs 2 q81to b2 qI1e 2 qQ 1defined and 2 q 1determined. >2 q"1 One definition is proposed here. 2 qN1 '-- $11  1- --- $11  - -', 2@Times New Roman-@Times New Roman-- 2 92 Notice:t-\2 T62  This document has been prepared to assist IEEE 802.22q2 !D2 . It is offered as a basis for discussion and is not binding on the 2 9}2 contributing individual(s) or organization(s). The material in this document is subject to change in form and content after j2 9?2 further study. The contributor(s) reserve(s) the right to add, M2 ,2 amend or withdraw material contained herein. 2 2  "Arial Unicode MS- 2 *92  -2 692 Release:-2 6Yx2  The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, 2 @9R2 and any modifications thereof, in the creation of an IEEE Standards publication; tG2 @h(2 o copyright in the IEEEs name any IEEE 2 K9|2 Standards publication even though it may include portions of this contribution; and at the IEEEs sole discretion to permit 2 U9\2 others to reproduce in whole or in part the resulting IEEE Standards publication. The contr72 U2 ibutor also acknowledges and m2 _9A2 accepts that this contribution may be made public by IEEE 802.22. 2 _*2   2 j92  -72 t92 Patent Policy and Procedures:-}2 tL2  The contributor is familiar with the IEEE 802 Patent Policy and Procedures  2 t2  - 2 ~92 <@Times New Roman-- J2 ~>*2 http://standards.ieee.org/guides/bylaws/sb 2 ~2 -2 ~ 2 bylaws.pdf- @ !>-- m2 ~ A2 >, including the statement "IEEE standards may include the known 2 9x2 use of patent(s), including patent applications, provided the IEEE receives assurance from the patent holder or applican2 2 t with :2 92 respect to patents essential for compliance with both mandatory and optional portions of the standard." Early disclosure to the 2 9x2 Working Group of patent information that might be relevant to the standard is essential to reduce the possibility for de 2 2 lays in 2 92 the development process and increase the likelihood that the draft publication will be approved for publication. Please notify -2 9 2 the Chair <- %2 b2 Carl R. Stevenson- @ !Fb-- M2 ,2 > as early as possible, in written or electr^2 =72 onic form, if patented technology (or technology under -2 9v2 patent application) might be incorporated into a draft standard being developed within the IEEE 802.22 Working Group.  - 2 2 If you  - q2 9D2 have questions, contact the IEEE Patent Committee Administrator at <- "2 J2 patcom@ieee.org - @ !CJ-  2 2 >-  2 2 . 2 2  '"System???????????-ccccccbbbbbbbbbbbbbbbbaaaaaaaaaaaaaaaa Motorola>3Y' doc.: IEEE 802.22-08/0058r0. Average Channel Gain over a Bandwidth Use of the Statistics Conclusion References Title Headings 8@ _PID_HLINKSA|uAmailto:patcom@ieee.orgymailto:carl.stevenson@ieee.orgZF6http://standards.ieee.org/guides/bylaws/sb-bylaws.pdf  FMicrosoft Office Word Document MSWordDocWord.Document.89q<@< NormalCJ_HmH sH tH N@N Heading 1$$@@&5>*CJ OJQJN@N Heading 2$$@&5>*CJOJQJP@P Heading 3$$<@&5CJOJQJDA@D Default Paragraph FontVi@V  Table Normal :V 44 la (k(No List > @> Footer$d P2CJB@B Header&d P25CJ.O. 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