Communications, Radar & Electronic Warfare (201.. - Index of

Intelference Analysis249Received power (dBm)-4°gi'r-I-- '!---,, i!I' ! ml' 'lm5. ,1- -Ii -I-- 1IUi . - - +- t -'-r I- 1I=-!==Cj - '-+-r-- ! I- -Ii 'H-,-r- :-50 '1-\--i-- 1'± I · I1-_\:: - -1/- - '1 - . -, " -':'-1- ,. -- - - . - -:=_\ :== ::::- . 1-:=1- 1- - ---=- -_:_ -':::;=:==I :: _ =_=-60 --.i, "-; .I--j!== :: 1 '-1 - ---r--- .:.r - - - --t-r -- - ----;-- - r- --'-- . - - . - -E -I\: 1 - - l'- '- -r- " 1 - .....- -< . - , 1 - .. - -"1ll -70 . ' ,:s - -- -- :.. ·::}1 30dB Jammmg !.: -- . .-,- -- -, . -. .... ' - -.. .. r' -·-r·· ..: ..,J._._. L + __ r- __: - -t --i -- -;-I----r"'---'0 -80, .D..I=-:= i-·--=:::st.ftI-j-- --. 1- - h ... -, . ..- . i- '--j--h- -- ,. _oj..-90 f£ ' 'I . I ," t. . ····t I ·-I - 1 1--'-- =r--- --1- - --r- ---' jr---'-i , 1------. -r-i--j---;-: -+-++-, -j --t--t---i-1 00tl-I-! I.-.--;--=';:.-1 10:;;;="}'H 20 dB Jamml ng 11 _ __ _ 1-- --1 - - ---- --i ; ·1 ' O d B : Ja m m 'n g I: ·t ;·I '- - =t - =j ---t- -- :::j.i= .:-- :-- .:::-=-=t ::: --- + :: :::I+-- -j- - -t-;------ -I-!-H-i- --- - ----1"-Distance (km)Figure 14.3 Effect of jamming on the range of a mobIle phone system. The effect is to reduce the rangethat the receIver can successfully receive signal from mobile sytems. NOIse jammmg and interferencehave exactly the ame effect.Wanted Signal versus InterfererFigure 14.4 A wanted base station and an interferer of equal power 25 krn away. The power of both isthe same 12.5 km away. Assuming that the wanted signal has a ell of 10 dB then range reduction occurswhere the interfering signal is within lO dB of the wanted power.