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GSM Receiver Key Parameters 2 GH. Contents NF (Noise Figure) Intermodulation Blocking Characteristics Phase Noise from Block Characteristics Reference.

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Presentation on theme: "GSM Receiver Key Parameters 2 GH. Contents NF (Noise Figure) Intermodulation Blocking Characteristics Phase Noise from Block Characteristics Reference."— Presentation transcript:

1 GSM Receiver Key Parameters 2 GH

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 SNR out =Co-channel interference test = 9 [dB] NF Max =SNR in /SNR out = SNR in – SNR out = = 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=S des -C/I req -S bl (df c )-10log(BW)

9 Phase Noise from Blocking Charac.2 For P-GSM,E-GSM Considering thermal noise Contribution, Gain compression For DCS-1800 df c S bl P N 3 MHz 1.6 MHz 600 KHz -23 dBm -33 dBm -43 dBm -138 dBc/Hz -128 dBc/Hz -118 dBc/Hz df c S bl 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 GSMDCS-1800 Wanted Signal [dBm] IC [dBm] Ia1[dBm] Ia2[dBm] 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 900DCS 1800 Power Control Level Nominal Output Power 9dBm) Tolerance (dB) for Conditions normalextreme Power Control Level Nominal Output Power 9dBm) Tolerance (dB) for Conditions normalextreme

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 dBc power level 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 higher

15 Spectrum due to modulation and wideband noise (1)

16 Spectrum due to modulation and wideband noise (2) GSM 900 Power Level Measurement Bandwidth 30 kHz Measurement Bandwidth 100KHz to < to < to < to <

17 Spectrum due to modulation and wideband noise (3) DCS 1800 Power Level Measurement Bandwidth 30 kHz Measurement Bandwidth 100KHz to < to < to <

18 Spectrum due to switching transients Mobile Station Power Level Maximum level measured 400kHz600kHz1200kHz1800kHz 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 BandFrequency offsetMeasurement 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 nW (-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 ~ 960 MHz : -79 dBm ~ 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 S.LCalculated valuesMargin NF6 (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) (Max)(GSM)7 -8 (typ.) (Max)(DCS)6 P1dB [dBm] Co-channel -13 (min APGA,min LNA) (min APGA,min LNA)-235 Input Desensitization (Blocking ) Offset 3 [MHz] [dBm] (GSM) (DCS)0 Phase Noise (3[MHz])) [dBc] Dynamic Range [dB] 98 (GSM)87 [-102-(-15))]11 85 (DCS)77 [-100-(-23)]8


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