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Corresponding to the nominal bit rate (2048 kb/s) 100%~150%,
that is, when it is 2048 kb/s~3072 kb/s, echo attenuation ≥14 dB.
Um Interface Indexes
Main indexes are as follows:
1. Wireless channel
Co-channel interference protection ratio C/I≥9 dB (static).
Interference protection ratio of the adjacent channels ≥ - 9 dB
Interference protection ratio the second adjacent channel ≥ -43 dB
The wireless channel selection adopts the shared signaling channel
mode.
2. Wireless RF modulation mode
OB06 supports EDGE service. There are 9 modulation and coding
modes, namely, MCS1~9. MCS1~4 retain the GMSK modulation mode,
while MCS5~9 use the 8PSK modulation mode. 8PSK allows 3-bit data
over each modulation signal on a wireless path, whereas GMSK allows
only 1-bit data under the same conditions. So, 8PSK realizes a higher
rate in data transmission; its transmission rate at the maximum is as
high as three time that of GPRS.
Different coding modes define different sizes of data blocks and
channel redundancy codes. In comparison with GPRS that features a
mono modulation technique, EDGE is capable of adapting to a more
adverse and wider wireless propagation environment.
3. The performance of the transmitter
i.
The phase error of the transmitter
The phase error of the transmitter is the error between the actual
phase and the theoretical one.
The Root Mean Square of the BS phase error is not greater than
5°and the peak value is not over 20°.
ii. The frequency error of the transmitter
The frequency error of the transmitter is the error between the
actual frequency and the theoretical one.
The BS frequency error is not over 0.05 ppm.
iii. Average transmitted carrier power (requirement for the power
amplifier output)
40 W or 80 W.
It is provided with the 6-level static power control function. Based
on the maximum output power, it can adjust downwards 6 power
levels with the step of 2 dB ± 1.0 dB. At the same time, BS has the
downlink power control function. Based on the set power level, it
can decrease the power from level zero to level-15 with the step of
2dB ± 1.5dB.
iv. Transmitted RF carrier power/time envelop
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Chapter 2 - Technical Indexes
21
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