Novatel Wireless NRM-EU870D Manual Do Utilizador
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Novatel Wireless
Revision 1
Integrator Design Elements: Antenna, SIM & SMBus
Antenna
HSDPA and EVDO Rev A Antenna Requirements
Total Radiated Power (TRP)
TRP measures the effective level of radiated power that is emitted while in transmit mode. To
quantify the performance of the transmitter, the output power is measured on a spherical surface
surrounding the laptop/handheld. The result of the measurement is a spherical radiation pattern
of the radiated power or EIRP (Effective Isotropic Radiated Power). To obtain a single figure of
merit the EIRP pattern is integrated over the spherical surface to obtain the TRP (Total Radiated
Power). Carriers provide antenna performance specifications which identify the necessary TRP
performance in order to be compliant with the carrier limits and attain Technical Acceptance.
quantify the performance of the transmitter, the output power is measured on a spherical surface
surrounding the laptop/handheld. The result of the measurement is a spherical radiation pattern
of the radiated power or EIRP (Effective Isotropic Radiated Power). To obtain a single figure of
merit the EIRP pattern is integrated over the spherical surface to obtain the TRP (Total Radiated
Power). Carriers provide antenna performance specifications which identify the necessary TRP
performance in order to be compliant with the carrier limits and attain Technical Acceptance.
Total Radiated Power Estimator
TRP can be estimated by summing the transmitted power of the Novatel Mini PCI Express cards
with the expected losses and antenna efficiency. A basic spreadsheet estimator
with the expected losses and antenna efficiency. A basic spreadsheet estimator
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is available
from Novatel Wireless and a sample is shown below. The EU860D/870D and E725 set points are
typical of factory production. The Cable & Connector Loss and the Antenna efficiency are
estimated by the host integrator to be representative of the laptop or handheld under
consideration. The results are typically compared against carrier requirements to estimate
compliance margin.
typical of factory production. The Cable & Connector Loss and the Antenna efficiency are
estimated by the host integrator to be representative of the laptop or handheld under
consideration. The results are typically compared against carrier requirements to estimate
compliance margin.
Total Isotropic Sensitivity (TIS)
TIS measures the effective sensitivity for a designated error rate. To quantify the performance of
the receiver, the receiver sensitivity is measured on a spherical surface surrounding the
Laptop/Handset. The sensitivity is defined as the minimum power level at which the digital error
rate of the receiver is better than a specific limit. Depending on the system this limit is a Bit Error
Rate (BER) limit, Block Error Rate (BLER) limit or a Frame Erasure Rate (FER) limit. Sensitivity is
measured by lowering the transmit power level of the base station simulator until the specified
digital error limit is reached. The power that was required to obtain the error limit is the sensitivity
value.
the receiver, the receiver sensitivity is measured on a spherical surface surrounding the
Laptop/Handset. The sensitivity is defined as the minimum power level at which the digital error
rate of the receiver is better than a specific limit. Depending on the system this limit is a Bit Error
Rate (BER) limit, Block Error Rate (BLER) limit or a Frame Erasure Rate (FER) limit. Sensitivity is
measured by lowering the transmit power level of the base station simulator until the specified
digital error limit is reached. The power that was required to obtain the error limit is the sensitivity
value.
TIS (Total Isotropic Sensitivity) Estimator
TIS can be estimated by reducing the Conducted Sensitivity of the module by losses and
desense noise. The Conducted Sensitivity is reduced by Cable loss, Cable loss, Antenna
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Disclaimer:
This spread sheet is provided with no warranties whatsoever. Novatel Wireless disclaims all liability relating
to the use of information in this specification. Note that this table is provided for rough estimation purposes only and is
intended to provide a first pass guideline for antenna loss planning. It is not to be a substitute for detailed design activity.
Additional losses, efficiency considerations and other system affects will modify the actual resulting TRP and as such
results will deviate from the TRP calculator shown above. Updates to TRP limits are not controlled in this document.
intended to provide a first pass guideline for antenna loss planning. It is not to be a substitute for detailed design activity.
Additional losses, efficiency considerations and other system affects will modify the actual resulting TRP and as such
results will deviate from the TRP calculator shown above. Updates to TRP limits are not controlled in this document.