TD-SCDMA Receiver Designs

Introduction

The TD-SCDMA receiver project demonstrates user equipment and base station characteristics. Design examples in this project are described in the following sections:

• BTS reference sensitivity level: TDSCDMA_UL_Sensitivity.dsn.
• UE adjacent channel selectivity: TDSCDMA_DL_AdjacentChannel.dsn.

Base Station

Reference Sensitivity Level
TDSCDMA_UL_Sensitivity.dsn

Description

This design measures the base station reference sensitivity level. The reference sensitivity level is the minimum mean power received at the antenna connector at which BER cannot exceed the value given in BS Reference Sensitivity Level.

Reference Measurement Channel Data Rate	BS Reference Sensitivity Level	BER
12.2 kbps	-110 dBm	BER cannot exceed 0.001

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

• TDSCDMA_RefCh_RF is used to generate 12.2 kbps uplink RF signal.
• TDSCDMA_12_2_UL_RakeReceiver is used to receive the uplink RF signal with data rate 12.2 kbps.
• TDSCDMA_BER is used to measure the BER
• TDSCDMA_RF_PwrMeasure is used to measure the mean power at the input port of the receiver.

TDSCDMA_UL_Sensitivity.dsn Schematic

Simulation Results

Simulation results are displayed in the data display window and shown in TDSCDMA_UL_Sensitivity.dsn Simulation Results.

TDSCDMA_UL_Sensitivity.dsn Simulation Results

Benchmark

• Hardware Platform: Pentium III 400 MHz, 512 MB memory
• Software Platform: Windows NT, ADS 2002
• Simulation Time: approximately 6 hours

References

1. 3GPP Technical Specification TS 25.142 V4.5.0 "3rd Generation Partnership Project; Technical Specification Group Radio Access Networks; Base station Conformance (TDD) (Release 4)" June, 2002.

User Equipment

Adjacent Channel Selectivity
TDSCDMA_DL_AdjacentChannel.dsn

Description

This design measures the adjacent channel selectivity. Adjacent channel selectivity is a measure of the receiver's ability to receive a wanted signal at its assigned channel frequency in the presence of an adjacent channel signal.
For the user equipment power class 2 and 3, the BER cannot exceed 0.001for parameters specified in Test Parameters for Adjacent Channel Selectivity. This test condition is equivalent to an adjacent channel selectivity value of 33 dB.

Parameter	Unit	Level
	dB	0
I or	dBm/1.28 MHz	-91
I osc	dBm/1.28 MHz	-54
F uw offset	MHz	+1.6 or -1.6

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

• The upper TDSCDMA_RefCh_RF is used to generate wanted 12.2 kbps downlink RF signal; the lower TDSCDMA_RefCh_RF is the adjacent channel signal.
• TDSCDMA_12_2_DL_RakeReceiver is used to receive the wanted downlink RF signal with a 12.2 kbps data rate in the presence of adjacent channel signal.
• TDSCDMA_BER is used to measure the BER.
• TDSCDMA_RF_PwrMeasure is used to measure the mean power at the input port of the receiver.

TDSCDMA_DL_AdjacentChannel.dsn Schematic

Simulation Results

Simulation results are shown in Adjacent Channel Selectivity Measurement Results.

Adjacent Channel Selectivity Measurement Results

Benchmark

• Hardware Platform: Pentium III 450MHz, 512MB memory
• Software Platform: Windows 2000, ADS 2002
• Simulation Time: approximately 9 hours

References

1. .3GPP TS 25.122 V4.4.0, "3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Terminal Conformance Specification; Radio transmission and Reception (TDD) (Release 4)", June, 2002