GSM Receiver Key Parameters

연구 2 실 GH 팀최근석

ContentsNF (Noise Figure)IntermodulationBlocking CharacteristicsPhase Noise from Block CharacteristicsReference Interference LevelPower Control LevelPhase Error and Mean Freq. ErrorTransmitted RF Carrier Power versus timeSpectrum due to Modulation and Wideband NoiseSpectrum due to Switching transientsSpurious EmissionComparing Calculated values with S.L

Noise Figure

NF(Noise Figure) Min. Sensitivity Level = -102 dBm SNRout=Co-channel interference test = 9 [dB] NFMax=SNRin/SNRout= SNRin – SNRout=18.8-9 = 9.8 [dB] for P-GSM, E-GSM = [(-100)-(-120.8)]-9 = 11.8 [dB] for DCS-1800

Input Noise Level- 173.8 + 10l log (200K)=- 120.8dBm/BW

Input Signal = - 102[dBm]

Gain = 0 dBNoise is only added by all

devices

Input Noise Level- 173.8 + 10l log (200K)=- 120.8dBm/BW

Input Signal = - 102 [dBm]

Added Noise Level

SNRout=9 dBSNRin=18.8 dB

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

Input Noise Level- 173.8 + 10l log (200K)=- 120.8dBm/BW

Input Signal =- 99 [dBm]

Gain = 0 dBNoise is only added by all

devices

Input Noise Level + NF- 120.8+9.8=- 111 [dBm]

IMD

fo=- 49 dBm (CW) fo=- 49 dBm (Modulated)

fo

fo+800[MHz]

fo+1600[MHz]

Input Signal =- 99 [dBm]

fo=- 49 dBm (CW)fo=- 49 dBm (Modulated)

Delta P

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

E-GSM Blocking Characteristics

Spurious response Freq. (-43 dBm)In bnad 905~915 [MHz] –5dBm

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)

Phase Noise from Blocking Charac.1

Assuming the receiver channel : NoiselessPhase Noise=Sdes-C/Ireq-Sbl(dfc)-10log(BW)

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 MHz1.6 MHz600 KHz

-23 dBm-33 dBm-43 dBm

-138 dBc/Hz-128 dBc/Hz-118 dBc/Hz

dfc Sbl P N

3 MHz1.6 MHz600 KHz

-23 dBm-33 dBm-43 dBm

-136 dBc/Hz-128 dBc/Hz-118 dBc/Hz

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

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)

Power Control LevelGSM 900 DCS 1800

Power Control Level

Nominal Output Power 9dBm)

Tolerance (dB) for Conditions

normal extreme

0-23456789

101112131415161718

19 - 31

393735333129272523211917151311975

-+2-+3-+3-+3-+3-+3-+3-+3-+3-+3-+3-+3-+3-+3-+5-+5-+5-+5

-+2.5-+4-+4-+4-+4-+4-+4-+4-+4-+4-+4-+4-+4-+4-+6-+6-+6-+6

Power Control Level

Nominal Output Power 9dBm)

Tolerance (dB) for Conditions

normal extreme

2930310123456789

1011121314

15-28

363432302826242220181614121086420

-+2-+3-+3-+3-+3-+3-+3-+3-+3-+3-+3-+3-+4-+4-+4-+4-+4-+5-+5

-+2.5-+4-+4-+4-+4-+4-+4-+4-+4-+4-+4-+4-+5-+5-+5-+5-+5-+6-+6

Phase Error and Mean Freq. Error

RMS Phase Error 5 (degrees)

Maximum Peak Deviation 20 (degrees)

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

15GSM 900 –30 dBc or –17dBm, whichever is

higher DCS 1800 –30 dBc or –20dBM, whichever

is higher

Spectrum due to modulation and wideband noise (1)

개념도

Spectrum due to modulation and wideband noise (2)

GSM 900PowerLevel

Measurement Bandwidth30 kHz

Measurement Bandwidth100KHz

100 200 250 400 600 to < 1200

1200 to <1800

1800 to <3000

3000 to < 6000

≥6000

≥393735

≤33

+0.5+0.5+0.5+0.5

-30-30-30-30

-33-33-33-33

-60-60-60-60

-66-64-62-60

-66-64-62-60

-69-67-65-63

-71-69-67-65

-77-75-73-71

Relativepower(dB)

0

-10

-20

-30

-50

-40

-60

-70

-80

0 200 400 600Frequency from the carrier (kHz)

measurement bandwidth 30 kHz measurement bandwidth 100k Hz

1200 1800 60003000

Spectrum due to modulation and wideband noise (3)

DCS 1800PowerLevel

Measurement Bandwidth30 kHz

Measurement Bandwidth100KHz

100 200 250 400 600 to < 1200

1200 to <1800

1800 to <6000

≥6000

≥363432302826

≤24

+0.5+0.5+0.5+0.5+0.5+0.5+0.5

-30-30-30-30-30-30

-33-33-33-33-33-33-33

-60-60-60-60-60-60-60

-60-60-60-60-60-60-60

-60-60-60-60-60-60-60

-71-69-67-65-63-61-59

-79-77-75-73-71-69-67

Relativepower(dB)

0

-10

-20

-30

-50

-40

-60

-70

-80

0 200 400 600

Frequency from the carrier (kHz)

measurement bandwidth 30 kHz

measurement bandwidth 100kHz

1200 1800 6000 Edge of TX band + 2 MHz

Spectrum due to switching transientsMobile Station

Power LevelMaximum level measured

400kHz 600kHz 1200kHz 1800kHz

39 dBm≤37 dBm

-21dBm-23 dBm

-26 dBm-26 dBm

-32 dBm-32 dBm

-36 dBm-36 dBm

Spurious Emissions(1) [allocated a channel]250 nW(-36dBm) in the frequency 9 kHz to 1 GHz1 uW(-30dBm) in the frequency 1 to 12.75 GHz

Band Frequency offset Measurement bandwidth

100 kHz to 50 MHz50 MHz to 500 MHzAbove 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 kHz100 kHz

30 KHz100 KHz300 KHz1 MHz3 MHz

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 1.785 GHz - 20 nW (-47 dBm) in the frequency bands 1 GHz to 1.71 GHz, 1.785 to 12.75 GHz * RX band RBW=VBW=100kHz , averaging over at least 50 bursts 200kHz multiples - 935 ~ 960 MHz : -79 dBm - 925 ~ 935 MHz : -67 dBm - 1805 ~ 1880 MHz : -71 dBm As exceptions up to 5 with a level up to –36 dBm (925 ~960 MHz, 1805 ~ 1880 MHz)

Comparing Calculated values with S.L in the Receiver

　 S.L Calculated values

Margin

NF 6 (typ.) 9.8 (GSM) 3.8

7(Max) 1.8

7(typ.) 11.8 (DCS) 4.8

8(Max) 3.8

IIP3 [dBm] -8 (typ) -18 10

-15 (Max) (GSM) 7

-8 (typ.) -18 10

-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]

-18 -23 5

-23 (GSM) 0

-23 -26 3

-26 (DCS) 0

Phase Noise (3[MHz])) [dBc]

-144 -143 1

Dynamic Range[dB]

98 (GSM) 87 [-102-(-15))] 11

85 (DCS) 77 [-100-(-23)] 8