TD-SCDMA Power Amplifier Designs

Introduction

The TDSCDMA_PA_Test project includes these design examples.

• Characterization of peak average power ratio versus probability: TDSCDMA_DL_CCDF.dsn.
• Instant and average power versus time measurements: TDSCDMA_UL_Power_vs_Time.dsn.
• CCDF and spectrum of multi-carrier signal measurements: TDSCDMA_MC_Test.dsn.

Complementary

Cumulative Distribution Function Measurements

TDSCDMA_PA_Test_prj Design Name

• TDSCDMA_DL_CCDF.dsn

Features

• Configurable signal source subnetwork model.
• DUT_Gain, FCarrier, Power, SamplesPerSymbol and SlotIndex parameter values can be set by the user.

Description

Complementary cumulative distribution function (CCDF) fully characterizes the power statistics of a signal. It provides peak-average ratio versus probability.
The top-level schematic for this design is shown in TDSCDMA_DL_CCDF.dsn Schematic.

TDSCDMA_DL_CCDF.dsn Schematic

Simulation Results

Simulation results are displayed in TDSCDMA_DL_CCDF.dds.
Page main, Page Main of Simulation Results, contains the most important final results and indicates if the measurement results met the requirement of technical specification. In this measurement, the test results would always be passed since there is no requirement of CCDF in TD-SCDMA technical specification.

Page figures, Page Figures of Simulation Results, shows the CCDF curve.

Page equations contains all variable definitions and calculations.

Page Main of Simulation Results

Page Figures of Simulation Results

Benchmark

• Hardware Platform: Pentium II 400 MHz, 512 MB memory
• Software Platform: Windows NT 4.0 Workstation, ADS 2002
• Simulation Time: approximately 3 minutes

References

1. 3GPP TS 25.221, 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Physical channels and mapping of transport channels onto physical channels onto physical channels (TDD) (Release 4), version 4.3.0, Dec., 2001

Power

vs. Time Measurement
TDSCDMA_UL_Power_vs_Time.dsn

Features

• Power vs. time measurement
• 12.2kbps uplink reference measurement channel
• Roll-off
  root raised-cosine filter

Description

This example measures power vs. time for TD-SCDMA uplink. Power vs. time is calculated by averaging the power of chips at the same position in all measured subframes.
The schematic for this design is shown in TDSCDMA_Power_vs_Time Schematic. TDSCDMA_UL_RF generates the 12.2k measurement channel. TDSCDMA_PwrMeasure implements the power measurement.

TDSCDMA_Power_vs_Time Schematic

Simulation Results

Simulation results are displayed in Power vs. time for TD-SCDMA Uplink.

The Equations page shows the equations that are used for calculating the mask.

Power vs. time for TD-SCDMA Uplink

Benchmark

• Hardware Platform: Pentium II 400 MHz, 512 MB memory
• Software Platform: Windows NT Workstation 4.0, ADS 2001
• Simulation Time: approximately 2 minutes

References

1. 3GPP TS 25.102, 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; UTRA(UE) TDD; Radio transmission and Reception (Release 4), version 4.3.0, Dec., 2001

CCDF and

Spectrum Measurements of Multi-carrier Signal

TDSCDMA_PA_Test_prj Design Name

• TDSCDMA_MC_Test.dsn

Features

• Multi-carrier signal source with 16 code channels on each carrier.
• FCarrier, FiletrLength, SamplesPerSymbol, DUT_Gain, NumSlotsMeasured and SystemDelay parameter values can be set by the user.

Description

The top-level schematic for this design is shown in TDSCDMA_MC_Test Schematic.

TDSCDMA_MC_Test Schematic

The sub_TDSCDMA_Channel16_MC provides multi-carrier signal on (1900-1.6)MHz, 1900MHz and (1900+1.6)MHz. The CCDFMeasurementMC and SpectrumAnalyzer is used to measure the CCDF and spectrum of the multi-carrier signal and the CCDFMeasurementSC is used to measure the CCDF of the single-carrier signal on 1900MHz.
The sub_TDSCDMA_Channel16_MC schematic is shown in sub_TDSCDMA_Channel16_MC Schematic.

sub_TDSCDMA_Channel16_MC Schematic

X1, X2 and X3 are sub_TDSCDMA_Channel16 subnetworks which provide baseband signal of a subframe including 16 code channels in time slot 6 and null in other time slots. X1 is modulated to 1900 MHz, X2 to (1900-1.6) MHz and X3 to (1900+1.6) MHz.

Simulation Results

Simulation results displayed in TDSCDMA_MC_Test.dds are shown in Simulation Results.

Simulation Results

Benchmark

• Hardware Platform: Pentium III 1 GHz, 512 MB memory
• Software Platform: Windows 2000, ADS 2002
• Simulation Time: approximately 5 minutes

References

1. 3GPP TS 25.221, 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Physical channels and mapping of transport channels onto physical channels onto physical channels (TDD) (Release 4), version 4.3.0, Dec., 2001