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Base Station Transmitter Design Examples for 1xEV Design Library

Introduction

The BS_TX_prj project shows 1xEV base station transmitter characteristics, including waveform quality (rho), total power, Pilot/MAC power, code domain power, conducted spurious emissions and occupied bandwidth. Designs for these include:

  • BS_TxACPR.dsn for Adjacent Channel Power Ratio measurement
  • BS_TxCDP.dsn for Code Domain Power measurements of MAC channel and forward traffic/control channel
  • BS_TxPower.dsn for transmit power and pilot/MAC power measurements
  • BS_TxPowerUpgrade.dsn with idle slot gain for transmit power and pilot/MAC power measurements
  • BS_TxRho.dsn for waveform quality measurement
  • BS_TxSpectrum.dsn for conducted spurious emissions and occupied bandwidth measurements

Adjacent Channel Power Ratio

BS_TxACPR.dsn

Features

  • ACPR measurements for QPSK, 8PSK, and 16QAM
  • ACPR measurements for idle and active slots
  • Pilot, preamble, MAC channel and 4 forward traffic channels
  • Signal source supports 12 data rates
  • Phase equalizer

Description

This example measures ACPR for 1xEV forward link. QPSK, 8PSK, and 16QAM modulation with idle and active slot transmission modes are swept.

The schematic for this design is shown in the following figure. 1xEV_FwdSrc generates the baseband signal which is up-converted to an IF signal with RF_TX_IFin1 for measurement. The SpectrumAnalyzer component implements spectrum measurement.

BS_TxACPR Schematic

Simulation Results

Simulation results are displayed as shown in the following figure.

Benchmark

  • Hardware Platform: Pentium II 333 MHz, 384 MB memory
  • Software Platform: Windows NT Workstation 4.0, ADS 2002
  • Simulation Time: approximately 9 minutes

References

  1. 3GPP2 C.S0032, Recommended Minimum Performance Standards for cdma2000 High Rate Packet Data Access Network , Initial Revision, Aug. 24, 2001.

Code Domain Power

BS_TxCDP.dsn

Features

  • Code domain power measurements for MAC, forward traffic, and control channels
  • Pilot, preamble, MAC, and 4 forward traffic channels
  • Signal source supports 12 data rates
  • Phase equalizer

Description

This example measures code domain power for 1xEV forward link. Code domain power is the power in each code channel of a CDMA channel. MAC, forward traffic and control channel code domain powers are swept. For forward traffic and control channel code domain power measurement, three data rates are swept: one slot version of 614.4, 1843.2, and 2457.6 kbps.

The schematic for this design is shown in the following figure. 1xEV_FwdSrc generates the baseband signal, which is up-converted to IF signal with with RF_TX_IFin for measurement. 1xEV_FwdCDP implements code domain power measurement.

BS_TxCDP Schematic

Simulation Results

Simulation results are displayed as shown in the following figure. The Equations page shows the equations that are used for calculating the values of CDP. The thresholds can be set by designers according to their requirements and are displayed in the result graphs. The CDP values are compared with the thresholds and the comparison result is shown in the Main page as Passed or Failed .

Benchmark

  • Hardware Platform: Pentium II 333 MHz, 384 MB memory
  • Software Platform: Windows NT Workstation 4.0, ADS 2002
  • Simulation Time: approximately 1 minute

References

  1. 3GPP2 C.S0032, Recommended Minimum Performance Standards for cdma2000 High Rate Packet Data Access Network , Initial Revision, Aug. 24, 2001.

RF Output Power

BS_TxPower.dsn

Features

  • Total transmit power and pilot/MAC channel power measurement
  • Pilot, preamble, MAC channel and 4 forward traffic channels
  • Signal source supports 12 data rates
  • Phase equalizer

Description

This example measures the total power and gated transmission characteristics for 1xEV forward link. When total power is measured, the pilot, MAC, and traffic or control channels are time-division multiplexed. All time-division multiplexed channels are transmitted at equal power. When the pilot/MAC power is measured, only pilot/MAC channels are transmitted in bursts of 224 chips every half slot.

The schematic for this design is shown in the following figure. 1xEV_FwdSrc generates the baseband signal, which is up-converted to an IF signal with RF_TX_IFin1 for measurement. 1xEV_PwrMeasure implements the power measurement.

BS_TxPower Schematic

Simulation Results

Simulation results are displayed as shown in the following figure. The Equations page shows the equations that are used for calculating the values of transmit power. Thresholds are set according to reference [1] sections 3.1.2.3.1 and 3.1.2.3.2 and are shown in the graphs.

Benchmark

  • Hardware Platform: Pentium II 333 MHz, 384 MB memory
  • Software Platform: Windows NT Workstation 4.0, ADS 2001
  • Simulation Time: approximately 5 minutes

References

  1. 3GPP2 C.S0032, Recommended Minimum Performance Standards for cdma2000 High Rate Packet Data Access Network , Initial Revision, Aug. 24, 2001.

RF Output Power with Idle Slot Gain

BS_TxPowerUpgrade.dsn

Features

  • Total transmit power and pilot/MAC channel power measurement
  • Pilot, preamble, MAC channel and 4 forward traffic channels
  • Signal source supports 12 data rates
  • Phase equalizer
  • Idle slot gain

Description

This example (same as BS_TxPower.dsn except it includes idle slot gain) measures the total power and gated transmission characteristics for 1xEV forward link. When total power is measured, the pilot, MAC, and traffic or control channels are time-division multiplexed. All time-division multiplexed channels are transmitted at equal power. When the pilot/MAC power is measured, only pilot/MAC channels are transmitted in bursts of 224 chips every half slot.
The sub_1xEV_FwdSrc generates the baseband signal, which is up-converted to an IF signal with RF_TX_IFin1 for measurement. 1xEV_PwrMeasure implements the power measurement.

The IdleSlotGain parameter has been included in sub_1xEV_FwdSrc where specified noise power can be added to the idle slot. Idle slot gain allows the noise level during the off time of the idle slot to be varied relative to the pilot channel. By varying the idle slot gain, the on/off power ratio can be set as needed to meet the transmission envelope mask requirements of the system.

The schematic for this design is shown in the following figure.

BS_TxPowerUpgrade Schematic

The sub_1xEV_FwdSrc schematic is shown in the following figure.

sub_1xEV_FwdSrc Schematic

The sub_1xEV_FwdTDM (designed for use with this project replaces 1xEV_FwdTDM used in BS_TXPower) is shown in the following figure. During the idle slot off period, uncorrelated noise can be added and the noise level can be varied relative to the pilot channel.

sub_1xEV_FwdTDM Schematic

Simulation Results

Simulation results are shown in the following figure.

The Equations page shows the equations used for calculating the values of transmit power. Thresholds, set according to reference [1] sections 3.1.2.3.1 and 3.1.2.3.2, are shown.

Transmit Power Measurement

Benchmark

  • Hardware Platform: Pentium II 400 MHz, 512 MB memory
  • Software Platform: Windows NT Workstation 4.0, ADS 2002
  • Simulation Time: approximately 4 minutes

References

  1. 3GPP2 C.S0032, Recommended Minimum Performance Standards for cdma2000 High Rate Packet Data Access Network , Initial Revision, Aug. 24, 2001.

Waveform Quality

BS_TxRho.dsn

Features

  • Normalized correlated power, Rho, measurement
  • Pilot, preamble, MAC channel and 4 forward traffic channels
  • Signal source supports 12 data rates
  • Phase equalizer

Description

This example is used to measure the waveform quality for 1xEV forward link. Waveform quality is measured by determining the normalized correlated power between the actual and the ideal waveform.

The schematic for this design is shown in the following figure. 1xEV_FwdSrc generates the baseband signal, which is up-converted to an IF signal with RF_TX_IFin1 for measurement. 1xEV_FwdRhoWithRef implements the Rho measurements.

The two data paths from the source to the measurement component are:

  • one for the real transmitted signal that goes through RF modulation;
  • one for the reference signal used in the measurement.

BS_TxRho Schematic

Simulation Results

Simulation results are displayed as shown in the following figure. The Equations page shows the equations that are used for calculating Rho. Thresholds are set according to Section 3.1.2.2.2, reference[1] and are can be set by designers according to their requirement. The comparison result is displayed in the Main page as Passed or Failed .

Benchmark

  • Hardware Platform: Pentium II 333 MHz, 384 MB memory
  • Software Platform: Windows NT Workstation 4.0, ADS 2002
  • Simulation Time: approximately 1 minute

References

  1. 3GPP2 C.S0032, Recommended Minimum Performance Standards for cdma2000 High Rate Packet Data Access Network , Initial Revision, Aug. 24, 2001.

Transmit Spectrum and Occupied Bandwidth

BS_TxSpectrum.dsn

Features

  • Conducted spurious emissions and occupied bandwidth measurement
  • Pilot, preamble, MAC channel and 4 forward traffic channels
  • Signal source supports 12 data rates
  • Phase equalizer

Description

This example is used to measure conducted spurious emissions and occupied bandwidth of 1xEV forward link. Conducted spurious emissions are emissions at frequencies that are outside the assigned CDMA channel, measured at the sector RF output port. Two cases are swept: idle slots and non-idle slots. Occupied bandwidth is the frequency range, whereby the power of emissions averaged over the frequency above and under the edge frequency are 0.5% each of the total radiation power of a modulated carrier.

The schematic for this design is shown in the following figure. 1xEV_FwdSrc generates the base band signal, which is up-converted to an IF signal with RF_TX_IFin1 for measurement. SpectrumAnalyzer implements the spectrum measurement.

BS_TxSpectrum Schematic

Simulation Results

Simulation results are displayed in the following three figures. The Equations page shows the equations that are used for calculating the spectrum. The test of occupied bandwidth apply to band class 3 and 6 only; band class 3 is used in the example design and thresholds are set according to Section 3.1.2.4.1 and 3.1.2.4.4, reference[1]. If other band classes are used, the thresholds in the Equations page should be changed accordingly. The comparison results for conducted spurious emissions are displayed in each page as Passed or Failed .

Conducted Spurious Emission for 1xEV Forward Link Idle Slots

Conducted Spurious Emission for 1xEV Forward Link Non-idle Slots

Benchmark

  • Hardware Platform: Pentium II 333 MHz, 384 MB memory
  • Software Platform: Windows NT Workstation 4.0, ADS 2001
  • Simulation Time: approximately 6 minutes

References

  1. 3GPP2 C.S0032, Recommended Minimum Performance Standards for cdma2000 High Rate Packet Data Access Network , Initial Revision, Aug. 24, 2001.
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