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Design Notes

Mobile WiMAX 802.16e TX Test Bench

This example demonstrates:

            WirelessMAN-OFDM Phy, compliant with IEEE 802.16e.

            Specification document: 802.16e-2005.pdf, Section 8.4.

Configurable options include:

• Rate_ID: 0 to 6 (defines modulation and code rate)

• UD_mode: Downlink PUSC, Downlink FUSC or Uplink PUSC

• NFFT: FFT size (2048, 1024, 512, 128)

• G: Cyclic prefix (1/4, 1/8, 1/16, 1/32)

• Nominal bandwidth (MHz)

• Carrier Frequency (MHz)

• TxOutLvlStart, TxOutLvlSpan, TxOutLvlStep (dBm): Define swept power of transmitted signal

The test bench can be used to monitor:

• The CCDF measurement

• The TX signal vs. spectral mask

• EVM %rms vs. output power

• The impact of phase noise on EVM

• The impact of phase/amplitude and DC offset on EVM

• ACPR

Note the amplifier model is based on a text data file. It can be replaced with an MWO circuit or a VSS behavioral amplifier model that accounts for frequency dependency. This test bench is used to illustrate several capabilities of VSS.

This example can be used to test a PA's error vector magnitude (EVM) performance vs. output power. This measurement is performed as described in WiMAX specification 802.16e-2005.pdf, Section 8.4.12.3.

A reference IQ plot versus the measured IQ plot is shown. EVM measurements are calculated for each power level and plotted in the "EVM vs. Output Power" graph.

Please read the online help for information on any of the blocks that are used in the system diagrams. In addition, please read the online help for ACPR and EVM measurements.

System Diagram - WiMAX System

Graph - IQ

Graph - AMtoAM

Graph - CCDF

Graph - OFDM Spectrum

Graph - EVM vs Output Power

Graph - ACPR