1. GSM Receiver Key Parameters
연구 2실 GH팀
최근석

2. Contents NF (Noise Figure) Intermodulation Blocking Characteristics
Phase Noise from Block Characteristics
Reference Interference Level
Power Control Level
Phase Error and Mean Freq. Error
Transmitted RF Carrier Power versus time
Spectrum due to Modulation and Wideband Noise
Spectrum due to Switching transients
Spurious Emission
Comparing Calculated values with S.L

3. Noise Figure NF(Noise Figure) Min. Sensitivity Level = -102 dBm
SNRout=Co-channel interference test = 9 [dB]
NFMax=SNRin/SNRout= SNRin – SNRout= = 9.8 [dB] for P-GSM, E-GSM
= [(-100)-(-120.8)]-9 = 11.8 [dB] for DCS-1800

4. Intermodulation Delta P =-49-(-111)=62 [dB]
IIP3=Pin + DeltaP/2 = /2 = -18 [dBm]

5. P-GSM Blocking Characteristics
In Band Maximum 6 occurrences (three contiguous occurrences per group)
Out of Band Maximum 24 occurrences (below fo and 3 contiguous occurrences per group

6. E-GSM Blocking Characteristics
Spurious response Freq. (-43 dBm)
In bnad 905~915 [MHz] –5dBm

7. DCS Blocking Characteristics
In Band Maximum 12 occurrences(3 contiguous occurrences per group)
Out Of Band 24 Occurrences(below fo and 3 contiguous occurrences per group)

8. Phase Noise from Blocking Charac.1
Assuming the receiver channel : Noiseless
Phase Noise=Sdes-C/Ireq-Sbl(dfc)-10log(BW)

9. Phase Noise from Blocking Charac.2
For P-GSM,E-GSM
Considering thermal noise Contribution,
Gain compression
For DCS-1800
dfc
Sbl
P N
3 MHz
1.6 MHz
600 KHz
-23 dBm
-33 dBm
-43 dBm
-138 dBc/Hz
-128 dBc/Hz
-118 dBc/Hz
dfc
Sbl
P N
3 MHz
1.6 MHz
600 KHz
-23 dBm
-33 dBm
-43 dBm
-136 dBc/Hz
-128 dBc/Hz
-118 dBc/Hz

10. Reference Interference Level
- for Cochannel Interference : C/Ic = 9 dB
- for Adjacent (200kHz) interference : C/Ia1 = -9 dB
- for Adjacent (400kHz) interference : C/Ia2 = -41 dB
- for Adjacent (600kHz) interference : C/Ia3 = -49 dB
Interference signal : GSM modulated
Wanted Signal : 20 dB above the reference sensitivity level
GSM
DCS-1800
Wanted Signal [dBm]
-82
-80
IC [dBm]
-91
-89
Ia1[dBm]
-73
-71
Ia2[dBm]
-41
-39
Ia3[dBm]
-33
-31

11. TX In Channel (Link Quality) - Phase error and mean freq. Error
- Mean transmitted RF Carrier Power
- Transmitted RF carrier Power versus time
Out of Channel (How much interference the user causes other
GSM Users)
- Spectrum due to modulation and wideband noise
- Spectrum due to switching
- Tx and Rx band spurious
Out of band (how much interference the user causes other users of the radio spectrum)
(military, aviation, police….)
- other spurious (cross band and wideband)

12. Power Control Level GSM 900 DCS 1800 Power Control Level
Nominal Output Power 9dBm)
Tolerance (dB) for Conditions
normal
extreme
0-2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 39 37 35 33 31 29 27 25 23 21 19
-+2
-+3
-+5
-+2.5
-+4
-+6
Power
Control Level
Nominal Output Power 9dBm)
Tolerance (dB) for Conditions
normal
extreme 29 30 31 1 2 3 4 5 6 7 8 9 10 11 12 13 14
15-28 36 34 32 28 26 24 22 20 18 16
-+2
-+3
-+4
-+5
-+2.5
-+6

13. Phase Error and Mean Freq. Error
RMS Phase Error
5 (degrees)
Maximum Peak
Deviation
20 (degrees)

14. Transmitted RF Carrier Power versus time
GSM 900 –4 dBc for power control level 16
-2 dBc power level 17
-1 dBC power level 18 and 19
DCS 1800 –4dBc for power control level 11
-2dBc for power level 12
-1dBc for power level 13,14 and 15
GSM 900 –30 dBc or –17dBm, whichever is
higher
DCS 1800 –30 dBc or –20dBM, whichever is

15. Spectrum due to modulation and wideband noise (1)
개념도

16. Spectrum due to modulation and wideband noise (2)
GSM 900
Power
Level
Measurement Bandwidth
30 kHz
100KHz
100
200
250
400
600 to < 1200
1200 to <1800
1800 to <3000
3000 to < 6000
≥6000
≥39 37 35
≤33
+0.5
-30
-33
-60
-66
-64
-62
-69
-67
-65
-63
-71
-77
-75
-73

17. Spectrum due to modulation and wideband noise (3)
DCS 1800
Power
Level
Measurement Bandwidth
30 kHz
100KHz
100
200
250
400
600 to < 1200
1200 to <1800
1800 to <6000
≥6000
≥36 34 32 30 28 26
≤24
+0.5
-30
-33
-60
-71
-69
-67
-65
-63
-61
-59
-79
-77
-75
-73

18. Spectrum due to switching transients
Mobile Station
Power Level
Maximum level measured
400kHz
600kHz
1200kHz
1800kHz
39 dBm
≤37 dBm
-21dBm
-23 dBm
-26 dBm
-32 dBm
-36 dBm

19. Spurious Emissions(1) [allocated a channel]
250 nW(-36dBm) in the frequency 9 kHz to 1 GHz
1 uW(-30dBm) in the frequency 1 to GHz
Band
Frequency offset
Measurement bandwidth
100 kHz to 50 MHz
50 MHz to 500 MHz
Above 500 MHz outside the relevant transmitted band -
(offset from edge of the relevant above band)
≥ 2 MHz
≥ 5 MHz
≥ 10 MHz
≥ 20 MHz
≥ 30 MHz
10 kHz
100 kHz
30 KHz
100 KHz
300 KHz
1 MHz
3 MHz

20. Spurious Emissions(2) [not allocated a channel( idle mode)]
- 2nW (-57 dBm) in the frequency bands 9kHz to 880 MHz, 915 MHz to 1000 MH
- 1.25nW (-59 dBm) in the frequency band 880 MHz to 915 MHz
- 5 nW (-53 dBm) in the frequency band 1.71 GHz to GHz
- 20 nW (-47 dBm) in the frequency bands 1 GHz to 1.71 GHz, to GHz
* RX band
RBW=VBW=100kHz , averaging over at least 50 bursts 200kHz multiples
- 935 ~ 960 MHz : -79 dBm
- 925 ~ 935 MHz : -67 dBm
~ 1880 MHz : -71 dBm
As exceptions up to 5 with a level up to –36 dBm
(925 ~960 MHz, 1805 ~ 1880 MHz)

21. Comparing Calculated values with S.L in the Receiver
Margin NF
6 (typ.)
9.8 (GSM)
3.8
7(Max)
1.8
7(typ.)
11.8 (DCS)
4.8
8(Max)
IIP3 [dBm]
-8 (typ)
-18 10
-15 (Max)
(GSM) 7
-8 (typ.)
-12(Max)
(DCS) 6
P1dB [dBm]
Co-channel
-13 (min APGA,min LNA)
-15 2
-22 (min APGA,min LNA)
-23 5
Input Desensitization
(Blocking )
Offset 3 [MHz]
[dBm]
-26 3
Phase Noise (3[MHz])) [dBc]
-144
-143 1
Dynamic Range
[dB]
98 (GSM)
87 [-102-(-15))] 11
85 (DCS)
77 [-100-(-23)] 8