## Presentation on theme: "GSM Receiver Key Parameters"— Presentation transcript:

연구 2실 GH팀 최근석

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

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

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

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 : Noiseless Phase 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 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

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 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

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 15 GSM 900 –30 dBc or –17dBm, whichever is higher DCS 1800 –30 dBc or –20dBM, whichever is

Spectrum due to modulation and wideband noise (1)
개념도

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

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

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

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

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)

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