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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.