CDMA 1x vs EVDO RF Spec Comparison
Agenda
 Sensitivity and Dynamic Range
 Single Tone Desensitization
 EVDO Intermodulation Spur
 CDMA 2000 Intermodulation Spur
 Adjacent Channel Selectivity
 Blocker
 RX Spurious Emission
 TX frequency accuracy
 TX hard handoff
 TX waveform quality factor
 Output Power Range
 Range of Closed Loop Power Control
 More Power Options
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Sensitivity and Dynamic Range
CDMA
2000
EVDO
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Single Tone Desensitization
CDMA
2000
EVDO
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EVDO Intermodulation Spur
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CDMA 2000 Intermodulation Spur
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Adjacent Channel Selectivity
CDMA
2000
EVDO
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Blocker
CDMA
2000
EVDO
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RX Spurious Emission
CDMA
2000
EVDO
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TX frequency accuracy
CDMA
2000
EVDO
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TX hard handoff
CDMA2000
T1 < 2 ms, the time elapsed from the action time to the instant the mobile station transmit power, as measured
at the mobile station antenna connector, on the old CDMA frequency assignment drops below -61 dBm/MHz
T2 < 140 ms, the time elapsed from the action time to the instant the mobile station transmitter is enabled on
the new CDMA frequency assignment.
Transmit power after handoff
RC1, RC2:
RC3-6:
EVDO
Not found
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TX waveform quality factor
• CDMA2000 (4.3.4.3)
 The waveform quality factor, ρ, shall be greater than 0.944
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(excess power is less than 0.25 dB).
The transmit time error, ˆτ , shall be within ±1 μs.
Test 1: Îor = -75 dBm
Test 2: Îor = -101 dBm
Test 3: Handoff
• EVDO (4.2.2):
 Test 1 (single carrier, Îor = -75 dBm) : the waveform quality factor,
ρoverall , > 0.944 (excess power is less than 0.25 dB).
 Test 2 (subtype 3, multiple carrier, Îor = -75 dBm): the waveform
quality factor, ρoverall , for each carrier, shall be greater than 0.933
(excess power is less than 0.30 dB).
 The transmit time error, ˆτ , shall be within ±1 μs.
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Output Power Range
CDMA
2000
EVDO
The testing conditions are identical (Ior).
The Spectrum mask (RX spurious emission) is identical.
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Time Response of Open Loop Power
Control
The upper limit curves are identical.
The lower limit hs 1 dB shift for the floor.
•EVDO
Lower limit: for t> 0
max [0.8 × |ΔPin| × [1 – e(1.67 - t)/36] - 2.0 dB, -1] - 1 dB;
•CDMA2000
Lower limit: for t> 0
max [0.8 × |ΔPin| × [1 - e(1.25 - t)/36] 2.0 dB, 0] - 1 dB;
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Range of Closed Loop Power Control
• EVDO:


Condition: The closed loop power control range shall be at least ±24 dB around the
open loop estimate.
Speed:
•
•

The interval from the end of the first ‘1’ power control bit after the 120 consecutive ‘0’ power
control bits to the time the access terminal output power starts to decrease shall be no longer
than 3.33 ms for Subtypes 0 and 1 Physical Layer and no longer than 13.33 ms for Subtype 2
Physical Layer.
The average rate of change in mean output power shall be greater than 12 dB per 26.67 ms and
less than 18 dB per 26.67 ms for Subtypes 0 and 1 Physical Layer and greater than 12 dB per
106.67 ms and less than 18 dB per 106.67 ms for Subtype 2 Physical Layer.
Accuracy: the mean output power of the access terminal shall be within 0.3 dB of its
final value in less than 500 μs.
• CDMA
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Step size depends on the support accuracy 0.5 dB, 0.25 dB.
The interval from the end of the first valid ‘1’ power control bit after the 100 consecutive
‘0’ valid power control bits to the time the mobile station output power starts to decrease
shall be no longer than 2.5 ms. The average rate of change in mean output power for
9600 bps data rate shall be greater than 12.8 dB per 20 ms and less than 19.2 dB per
20 ms
the mean output power of the mobile station shall be within 0.3 dB of its final value in
less than 500 μs.
The lower bit rate allows slower power adjustment speed.
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More Power Options
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Minimum Controlled Output Power: –50 dBm/1.23 MHz for both EVOD and CDMA2000.
Standby Output Power for both EVDO and CDMA2000: When the transmitter is disabled,
the output noise power spectral density of the access terminal shall be less than -61 dBm/1
MHz.
Gated Output Power (CDMA2000 only).
PRI Channel Output Power (EVDO only).
Code Domain Power:
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CDMA2000: simpler: Both the real and imaginary components of code domain power in each inactive
code channel shall be 23 dB or more below the total output power measured on both the I and Q
carrier phase components combined.
EVDO
•
DRC Channel Output Power
•
ACK Channel Output Power
•
Data Channel Output Power
•
DSC Channel Output Power
Code Channel Accuracy: CDMA2000 only.
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Questions?
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