umts2100 & cdma1900 interference ver a
DESCRIPTION
WCDMA 2100 (3GPP) – CDMA 1900 (3GPP2) Mixed Frequency Allocation in IndonesiaTRANSCRIPT
www.comba-telecom.com
1
Ben SunBen Sun Product Marketing Deputy Director
Antenna and Sub-Systems Business Unit [email protected]
Agenda
Basic (nter"erence (ssues
) Transmitter Spurious Emission
BackgroundBackground
WCDMA 2100 (3G! " CDMA 1900 (3G2!
M#$ed %reuenc' Aocat#on #n Indone)#a
) uard band is onl* +.12/ C3/A 4% to !mart1500
3%'
C3/A21000 - 4%6 1520-1570/ - 3%6 2110-2180/
1575.+8
1577.80
S*artfren &+, ca)e #ntroduct#on
13-12.M/ guard band "rom 3% o" !mart"ren and 4% o" $% 4%
ith new Carriers: there will be onl* 3-12.M/
T; <ilter
Antenna (solation
R; (nter"erence %evel
Transmit 4nitReceive 4nit
(nter"erence is mainl* caused b* transmitter non-linearities and
im&er"ect receiver "iltering.
) "ut o# band emission $sideband noise%
) Spurious emission $inter-modulation%
© 2012 Comba Telecom. All Rights Reserved88
Tran)*#tter S#deand o#)eTran)*#tter S#deand o#)e
(nter"erence cannot be removed at the inter"ered receiver f RX ': and
results in receiver desensitiation
) a reduction in recei!er sensiti!ity #or desired c'annel per#ormance.
Attenuation o" this in-band inter"erence is b*6 ) Additional transmit band #iltering
) &ncrease (uard band bet)een transmitter and recei!er spectrum
) &ncrease T* and * Antenna separation
Frequency
Rx Noise Floor
x Si!e"an! #evel
x Si!e"an! Noise
Tran)*#t S#deand o#)e ,ee)
C3/A1500 +==2 C.!0010-C v2.0'
Translated into C3/A 4% bandwidth6
<or +.7,/: the thermal noise "loor with @oise <igure +dB' is given b*
The amount o" noise rise in dB' at C3/A receiver can be com&uted b*
Assume a 1dB noise rise is acce&table: then out o" band emission &ower at
4/T! receiver will be lower than -111dBm
%or 4f W#t5#n t5e range
A66#e) to *ut#6e Carr#er)
7*#))#on #*#t
-1+dBm100kD+0/E"E1
813dB*1M/: 1G/;f;.G/
( ) dBmdBdBmkTB P nr 1053108 NFlog10 −=+−=+=
[ ] [ ]dB P
Antenna I)oat#onAntenna I)oat#on
Fertical (solation
λ avelengt! (m)
dB log2022 RxTx
G Tx
<ert#ca d#)tance AT I)oat#on (dB!
0.m 90
0.m ,1
© 2012 Comba Telecom. All Rights Reserved10
on Co8ocat#on De6o'*enton Co8ocat#on De6o'*ent
Wor)t Ca)e
0 m vertical is used C3/A1500 out o" band emission +==2'
1dB noise rise "or C3/A2100: ma;imum
inter"ered noise is =intG-111dBm+.7,/
/inimum A@T isolation6
oriontal isolation with 0dB A@T isolation
ill need a T$ "ilter reHection .3-=dB
MHz dBm P emi 84.3/2.7−=
dBdBmdBm 8.103)111(2.7'%N# =−−−=
Mea)ure*ent >e)ut)
Case 1Test out o" band emissions'6 ) As T$ o" C3/A1500 is too strong: the s&ectrum d*namic is not
enough to catch out o" band emissions: onl* wa* is to use a $% "ilter to
lower down the C3/A signal "irst
+ote, ATT #rom BTS to #ilter is around /0dB $//dB #or coupling1 /dB
#or cables%
Mea)ure*ent >e)ut)
noise is-71K+9G-,dBm100k
) ?Luals to -25dBm+.7,/
BT!: then -15dBm+.7,/
should be -15-111'G52dB
Conclusion6
) "ut o# band emission is better t'an /(PP;1 i# A+T isolation is more t'an 4;dB1
Mea)ure*ent >e)ut)
"ut o# band emissions
Mea)ure*ent >e)ut)
hat we calculated out is based on new carriers 1580-1570/': how
about $% e;isting sites 1590-1580/'M
<rom the curves right we assume ,0dB +0dB better than 1570/'
reHection on 1580/ C3/A T$ "ilter inside BT!'
h* ,0dBM
then ,+-9G-22dBm1.2/: means
-15dBm+.7,/.
10dB reHection on 1570/
<or e*isting sites1 isolation 'ig'er t'an 4;-/6=0;dB1 t'en no
need #ilters1 i# smaller t'an 0;dB1 )ill use #ilters
WCDMA Receiver ImperfectionWCDMA Receiver Imperfection
>ece#er De)en)#t#at#on>ece#er De)en)#t#at#on andand
Inter8*oduat#onInter8*oduat#on
© 2012 Comba Telecom. All Rights Reserved19
>ece#er Bock#ng (De)en)#t#)at#on!>ece#er Bock#ng (De)en)#t#)at#on!
Results when a strong transmit carrier that "alls outside the
&assband o" a receiver enters the receiver and blocks
the working o" the receiver.
Blocking occurs due to non-ideal receiver "iltering: which is unable
to reHect the strong out-o"-band carriers.
Transmitter Receiver
R; <ilter
>ut-o"-Band Carrier
© 2012 Comba Telecom. All Rights Reserved18
>ece#er Bock#ng (De)en)#t#)at#on!>ece#er Bock#ng (De)en)#t#)at#on!
>ut-o"-band transmit carriers must be &revented "rom entering the
receiver using a combination o" the "ollowing6
) Additional receive band #iltering
) &ncrease T* and * Antenna separation
4/T!2100 +== 2.10, v11.1.0' ) >30dBm #or co-location
) -96dBm #or ?DMA3466 $/(PP;%1 normally BTS is at least 36dB better
'ere. e can take -/6dB #or calculation
<or !mart ;,+dBm carriers
) Total isolation need :6>/6dB= 56dB A+T isolation1 is smaller t'an
56dB1 t'en it )ill need to add #ilters
© 2012 Comba Telecom. All Rights Reserved17
Results when 2 or more strong o""- or in-channel transmit carriers
enters and saturates the receiver
@on-linearities in the receiver results in (/ generation.
The out-o"-band signals must be &revented "rom entering the
receiver using a combination o" the "ollowing6 ) Additional receive band #iltering
) &ncrease (uard band bet)een T* and * spectrum
) &ncrease T* to * antenna separation
>ece#er Inter*oduat#on>ece#er Inter*oduat#on
<reLuenc*1TX f RX f 2TX f
R; @oise <loor
uard Band
© 2012 Comba Telecom. All Rights Reserved15
GSM900 >ece#er Inter*oduat#onGSM900 >ece#er Inter*oduat#on
(n general: the +rd >rder (ntermodulation (/' &roducts "or in&ut 2
carrier signals are given b*
)'ere
P c , &nput po)er le!el o# eac' carrier dBm
&&P / , &nput /rd order intercept point o# BTS dBm
Assuming that the C3/A BT! has &&P + G - dBm: and a ma;imum
allowable in&ut &M + o" -111dBm+.7,/: then ma;imum in&ut
&ower is
<or !mart ;,+dBm carriers ) Total isolation need :6-$-96%dB= 46dB A+T isolation1 is smaller t'an
56dB1 t'en it )ill need to add #ilters
) &# : t' order1 around 56dB $34C6-34C:M78%1 C t' order $340:-34C6M78%
C6dB1 4t' order 06dB$3406-340:M78%
33 23 IIP P IM c −=
Su**ar'Su**ar'
T$ "ilter
A@T isolation smaller than 52dB need "ilter "or channel 12 158-
1570/'
A@T isolation smaller than 88dB need "ilter "or channel 11 1580-
158/'
A@T isolation smaller than 92dB need "ilter "or channel 10 159-
1580/'
R$ <ilter
A@T isolation smaller than 50dB need "ilter "or channel 12 158-
1570/'
A@T isolation smaller than 70dB need "ilter "or channel 11 1580-
1570/'
A@T isolation smaller than 80dB need "ilter "or channel 10 1589-
1580/'
1
Ben SunBen Sun Product Marketing Deputy Director
Antenna and Sub-Systems Business Unit [email protected]
Agenda
Basic (nter"erence (ssues
) Transmitter Spurious Emission
BackgroundBackground
WCDMA 2100 (3G! " CDMA 1900 (3G2!
M#$ed %reuenc' Aocat#on #n Indone)#a
) uard band is onl* +.12/ C3/A 4% to !mart1500
3%'
C3/A21000 - 4%6 1520-1570/ - 3%6 2110-2180/
1575.+8
1577.80
S*artfren &+, ca)e #ntroduct#on
13-12.M/ guard band "rom 3% o" !mart"ren and 4% o" $% 4%
ith new Carriers: there will be onl* 3-12.M/
T; <ilter
Antenna (solation
R; (nter"erence %evel
Transmit 4nitReceive 4nit
(nter"erence is mainl* caused b* transmitter non-linearities and
im&er"ect receiver "iltering.
) "ut o# band emission $sideband noise%
) Spurious emission $inter-modulation%
© 2012 Comba Telecom. All Rights Reserved88
Tran)*#tter S#deand o#)eTran)*#tter S#deand o#)e
(nter"erence cannot be removed at the inter"ered receiver f RX ': and
results in receiver desensitiation
) a reduction in recei!er sensiti!ity #or desired c'annel per#ormance.
Attenuation o" this in-band inter"erence is b*6 ) Additional transmit band #iltering
) &ncrease (uard band bet)een transmitter and recei!er spectrum
) &ncrease T* and * Antenna separation
Frequency
Rx Noise Floor
x Si!e"an! #evel
x Si!e"an! Noise
Tran)*#t S#deand o#)e ,ee)
C3/A1500 +==2 C.!0010-C v2.0'
Translated into C3/A 4% bandwidth6
<or +.7,/: the thermal noise "loor with @oise <igure +dB' is given b*
The amount o" noise rise in dB' at C3/A receiver can be com&uted b*
Assume a 1dB noise rise is acce&table: then out o" band emission &ower at
4/T! receiver will be lower than -111dBm
%or 4f W#t5#n t5e range
A66#e) to *ut#6e Carr#er)
7*#))#on #*#t
-1+dBm100kD+0/E"E1
813dB*1M/: 1G/;f;.G/
( ) dBmdBdBmkTB P nr 1053108 NFlog10 −=+−=+=
[ ] [ ]dB P
Antenna I)oat#onAntenna I)oat#on
Fertical (solation
λ avelengt! (m)
dB log2022 RxTx
G Tx
<ert#ca d#)tance AT I)oat#on (dB!
0.m 90
0.m ,1
© 2012 Comba Telecom. All Rights Reserved10
on Co8ocat#on De6o'*enton Co8ocat#on De6o'*ent
Wor)t Ca)e
0 m vertical is used C3/A1500 out o" band emission +==2'
1dB noise rise "or C3/A2100: ma;imum
inter"ered noise is =intG-111dBm+.7,/
/inimum A@T isolation6
oriontal isolation with 0dB A@T isolation
ill need a T$ "ilter reHection .3-=dB
MHz dBm P emi 84.3/2.7−=
dBdBmdBm 8.103)111(2.7'%N# =−−−=
Mea)ure*ent >e)ut)
Case 1Test out o" band emissions'6 ) As T$ o" C3/A1500 is too strong: the s&ectrum d*namic is not
enough to catch out o" band emissions: onl* wa* is to use a $% "ilter to
lower down the C3/A signal "irst
+ote, ATT #rom BTS to #ilter is around /0dB $//dB #or coupling1 /dB
#or cables%
Mea)ure*ent >e)ut)
noise is-71K+9G-,dBm100k
) ?Luals to -25dBm+.7,/
BT!: then -15dBm+.7,/
should be -15-111'G52dB
Conclusion6
) "ut o# band emission is better t'an /(PP;1 i# A+T isolation is more t'an 4;dB1
Mea)ure*ent >e)ut)
"ut o# band emissions
Mea)ure*ent >e)ut)
hat we calculated out is based on new carriers 1580-1570/': how
about $% e;isting sites 1590-1580/'M
<rom the curves right we assume ,0dB +0dB better than 1570/'
reHection on 1580/ C3/A T$ "ilter inside BT!'
h* ,0dBM
then ,+-9G-22dBm1.2/: means
-15dBm+.7,/.
10dB reHection on 1570/
<or e*isting sites1 isolation 'ig'er t'an 4;-/6=0;dB1 t'en no
need #ilters1 i# smaller t'an 0;dB1 )ill use #ilters
WCDMA Receiver ImperfectionWCDMA Receiver Imperfection
>ece#er De)en)#t#at#on>ece#er De)en)#t#at#on andand
Inter8*oduat#onInter8*oduat#on
© 2012 Comba Telecom. All Rights Reserved19
>ece#er Bock#ng (De)en)#t#)at#on!>ece#er Bock#ng (De)en)#t#)at#on!
Results when a strong transmit carrier that "alls outside the
&assband o" a receiver enters the receiver and blocks
the working o" the receiver.
Blocking occurs due to non-ideal receiver "iltering: which is unable
to reHect the strong out-o"-band carriers.
Transmitter Receiver
R; <ilter
>ut-o"-Band Carrier
© 2012 Comba Telecom. All Rights Reserved18
>ece#er Bock#ng (De)en)#t#)at#on!>ece#er Bock#ng (De)en)#t#)at#on!
>ut-o"-band transmit carriers must be &revented "rom entering the
receiver using a combination o" the "ollowing6
) Additional receive band #iltering
) &ncrease T* and * Antenna separation
4/T!2100 +== 2.10, v11.1.0' ) >30dBm #or co-location
) -96dBm #or ?DMA3466 $/(PP;%1 normally BTS is at least 36dB better
'ere. e can take -/6dB #or calculation
<or !mart ;,+dBm carriers
) Total isolation need :6>/6dB= 56dB A+T isolation1 is smaller t'an
56dB1 t'en it )ill need to add #ilters
© 2012 Comba Telecom. All Rights Reserved17
Results when 2 or more strong o""- or in-channel transmit carriers
enters and saturates the receiver
@on-linearities in the receiver results in (/ generation.
The out-o"-band signals must be &revented "rom entering the
receiver using a combination o" the "ollowing6 ) Additional receive band #iltering
) &ncrease (uard band bet)een T* and * spectrum
) &ncrease T* to * antenna separation
>ece#er Inter*oduat#on>ece#er Inter*oduat#on
<reLuenc*1TX f RX f 2TX f
R; @oise <loor
uard Band
© 2012 Comba Telecom. All Rights Reserved15
GSM900 >ece#er Inter*oduat#onGSM900 >ece#er Inter*oduat#on
(n general: the +rd >rder (ntermodulation (/' &roducts "or in&ut 2
carrier signals are given b*
)'ere
P c , &nput po)er le!el o# eac' carrier dBm
&&P / , &nput /rd order intercept point o# BTS dBm
Assuming that the C3/A BT! has &&P + G - dBm: and a ma;imum
allowable in&ut &M + o" -111dBm+.7,/: then ma;imum in&ut
&ower is
<or !mart ;,+dBm carriers ) Total isolation need :6-$-96%dB= 46dB A+T isolation1 is smaller t'an
56dB1 t'en it )ill need to add #ilters
) &# : t' order1 around 56dB $34C6-34C:M78%1 C t' order $340:-34C6M78%
C6dB1 4t' order 06dB$3406-340:M78%
33 23 IIP P IM c −=
Su**ar'Su**ar'
T$ "ilter
A@T isolation smaller than 52dB need "ilter "or channel 12 158-
1570/'
A@T isolation smaller than 88dB need "ilter "or channel 11 1580-
158/'
A@T isolation smaller than 92dB need "ilter "or channel 10 159-
1580/'
R$ <ilter
A@T isolation smaller than 50dB need "ilter "or channel 12 158-
1570/'
A@T isolation smaller than 70dB need "ilter "or channel 11 1580-
1570/'
A@T isolation smaller than 80dB need "ilter "or channel 10 1589-
1580/'