WMAN_DL_802_16e_RX_Sensitivity

This section provides parameter information for Required Parameters, Basic Parameters, Signal Parameters, and parameters for the various measurements.

Setting Parameters

More control of the test bench can be achieved by setting parameters in the Basic Parameters , Signal Parameters , and measurement categories for the activated measurements.

Note
For required parameter information, see Set the Required Parameters.

Basic Parameters

  1. SourceR is the RF output source resistance.
  2. SourceTemp is the RF output source resistance temperature (oC) and sets noise density in the RF output signal to (k(SourceTemp+273.15)) Watts/Hz, where k is Boltzmann's constant.
  3. MeasR defines the load resistance for the RF DUT output Meas signal into the test bench. This resistance loads the RF DUT output; it is also the reference resistance for Meas signal power measurements.
  4. TestBenchSeed is an integer used to seed the random number generator used with the test bench. This value is used by all test bench random number generators, except those RF DUT components that use their own specific seed parameter. TestBenchSeed initializes the random number generation. The same seed value produces the same random results, thereby giving you predictable simulation results. To generate repeatable random output from simulation to simulation, use any positive seed value. If you want the output to be truly random, enter the seed value of 0.

Signal Parameters

  1. GainImbalance, PhaseImbalance are used to add certain impairments to the ideal output RF signal. Impairments are added in the order described here.
    The unimpaired RF I and Q envelope voltages have gain and phase imbalance applied. The RF is given by:

    where A is a scaling factor that depends on the SourcePower and SourceR parameters specified by the user, V I( t ) is the in-phase RF envelope, V Q( t ) is the quadrature phase RF envelope, g is the gain imbalance

    and, φ (in degrees) is the phase imbalance.
  2. Bandwidth determines the nominal channel bandwidth.
  3. OversamplingOption indicates the oversampling ratio of transmission signal. There are six oversampling ratios (1, 2, 4, 8, 16, 32) to support in this source.
  4. FFTSize specifies the size of FFT. Sizes 2048, 1024 and 512 are supported.
  5. CyclicPrefix specifies the ratio of cyclic prefix time to "useful" time, whose range is from 0 to 1.
  6. FrameMode specifies the duplexing method which should be FDD or TDD. In FDD transmission, the downlink occupies the entire frame and the respective gaps (zeros) are automatically adjusted to fill the frame.
  7. DL_Ratio specifies set the percentage (1 to 99) of the frame time to be used for the downlink subframe. The parameter is only active when the FrameMode is TDD.
  8. FrameDuration determines the frame durations (ms) of the generated waveform.There are eight frame durations (2ms, 2.5ms, 4ms, 5ms, 8ms, 10ms, 12.5ms, 20ms) to be selected as allowed by the specification.
  9. DLMAP_Enable specifies whether the DL-MAP burst is inserted in the downlink burst.
  10. ULMAP_Enable specifies whether the UL-MAP burst is inserted in the downlink burst.
  11. PreambleIndex specifies the preamble index number (0 to 113). The preamble index value determines the ID Cell values (0 to 31) and segment index (0 to 2) according to the standard.
  12. DL_PermBase specifies the basis of downlink permutation to be used in initialization vector of the PRBS generator for subchannel randomization in the zone and in STC_DL_Zone_IE() in DL-MAP message.
  13. BSID specifies the base station ID which is used in DL-MAP message.
  14. PRBS_ID specifies the PRBS ID which may be used in initialization vector of the PRBS generator for subchannel randomization and in STC_DL_Zone_IE() in DL-MAP message.
  15. ZoneType specifies the zone type which can be set to PUSC, FUSC or OFUSC.
  16. ZoneNumOfSym specifies the symbol number for the zone. The value must be a multiple of two for DL_PUSC, and be a multiple of one for DL_FUSC and DL_OFUSC.
  17. GroupBitmask specifies which groups of subchannel are used on the PUSC zone. This parameter uses 1 for assigned groups and 0 for unassigned groups.
  18. NumberOfBurst specifies the number of active downlink bursts.
  19. BurstWithFEC specifies the downlink burst FEC.
  20. BurstSymOffset, BurstSubchOffset, BurstNumOfSym and BurstNumOfSubch specify the position and range for each rectangular burst, see Downlink rectangular burst structure.

    Downlink rectangular burst structure
  21. DataLength specifies MAC PDU payload byte length for each burst.
  22. CodingType specifies the coding type for each burst. Each coding type can be selected from 0 to 1, whose meaning is shown in The meaning of coding type.
    The meaning of coding type
    Coding type meaning
    0 Convolutional coding (CC)
    1 Convolutional turbo coding (CTC)
  23. Rate_ID specifies the rate ID for each burst. Rate_ID, along with CodingType, determines the modulation and coding rate, shown in The relation of Coding type and Rate ID.
    The relation of Coding type and Rate ID
    Coding type Rate ID Modulation/Coding rate
    0 (CC) 0 QPSK CC1/2
    0 (CC) 1 QPSK CC3/4
    0 (CC) 2 16-QAM CC1/2
    0 (CC) 3 16-QAM CC3/4
    0 (CC) 4 64-QAM CC1/2
    0 (CC) 5 64-QAM CC2/3
    0 (CC) 6 64-QAM CC3/4
    1 (CTC) 0 QPSK CTC1/2
    1 (CTC) 1 QPSK CTC3/4
    1 (CTC) 2 16-QAM CTC1/2
    1 (CTC) 3 16-QAM CTC3/4
    1 (CTC) 4 64-QAM CTC1/2
    1 (CTC) 5 64-QAM CTC2/3
    1 (CTC) 6 64-QAM CTC3/4
    1 (CTC) 7 64-QAM CTC5/6
  24. RepetitionCoding specifies the repetition coding for each burst. Each repetition coding can be selected from 0 to 3, whose meaning is shown in The meaning of repetition coding.
    Repetition coding meaning
    0 No repetition coding on the burst
    1 Repetition coding of 2 used on the burst
    2 Repetition coding of 4 used on the burst
    3 Repetition coding of 6 used on the burst
  25. PowerBoosting specifies the power boosting for each burst. Each value is defined in units of dB.
  26. DecoderType specifiers the Viterbi decoder type chosen from CSI, Soft and Hard.
  27. StopFrame specifiers the stop burst used for BER and FER calculation.

Measurement Parameters

  1. DisplayPages provides Data Display page information for this measurement. It cannot be changed by the user.

Simulation Measurement Displays

After running the simulation, results are displayed in the Data Display pages for each measurement activated.

Note
Measurement results from a wireless test bench have associated names that can be used in Data Display Expressions. For more information, refer to Measurement Results for Expressions.

Sensitivity Measurement

The sensitivity measurement shows BER and PER results. The BER measured after FEC shall be less than 10^(-6) at the power levels RSS defined in equation (149b) of section 8.4.13.1 of Reference [2] (assuming 5dB implementation margin and 8dB Noise Figure). Simulation results for "Rate_ID = 5" and SourcePower of -75 dBm are displayed in Simulation Results for "Rate_ID = 5" and -75 dBm SourcePower.



Simulation Results for "Rate_ID = 5" and -75 dBm SourcePower

Test Bench Variables for Data Displays

Variables listed in Test Bench Variables for Data Displays are used to set up this test bench and data displays.

Test Bench Variables for Data Displays
Data Display Parameter Equation with Test Bench Parameters
RF_FSource FSource
RF_Power_dBm 10*log10(SourcePower)+30
RF_R SourceR
TimeStep 1/SamplingFrequency/(2^OversamplintOption)
SamplingFrequency Bandwidth*n (n is sampling factor)
Bandwidth Bandwidth
RateID Rate_ID
CyclicPrefix CyclicPrefix
Data_Length DataLength
Frame_Duration FrameDuration
Frame_Mode FrameMode
DL_Ratio DL_Ratio
Meas_FMeasurement FMeasurement
Meas_R MeasR

Baseline Performance

Expected ADS Performance

Expected ADS performance is the combined performance of the baseline test bench and the RF DUT Circuit Envelope simulation with the same signal and number of time points. For example, if the RF DUT performance with Circuit Envelope simulation alone takes 2 hours and consumes 200 MB of memory (excluding the memory consumed by the core ADS product), then add these numbers to the Baseline Performance numbers to determine the expected ADS performance. This is valid only if the full memory consumed is from RAM. If RAM is less, larger simulation times may result due to increased disk access time for swap memory usage.

References for Mobile WiMAX Downlink Receiver Sensitivity Test

  1. IEEE Std 802.16-2004, Part 16: Air Interface for Fixed Broadband Wireless Access Systems, Section 8.4 WirelessMAN-OFDMA PHY, October 1, 2004.
  2. IEEE Std 802.16e-2005, Amendment 2: for Physical and Medium Access Control Layers for Combined Fixed and Mobile Operation in Licensed Bands and Corrigendum 1, - Part 16: Air Interface for Fixed Broadband Wireless Access Systems, Section 8.4 WirelessMAN -OFDMA PHY, February 2006.

Setting up a Wireless Test Bench Analysis in the Wireless Test Bench Simulation documentation explains how to use test bench windows and dialogs to perform analysis tasks.

Setting Circuit Envelope Analysis Parameters in the Wireless Test Bench Simulation documentation explains how to set up circuit envelope analysis parameters such as convergence criteria, solver selection, and initial guess.

Setting Automatic Behavioral Modeling Parameters in the Wireless Test Bench Simulation documentation to learn how to improve simulation speed.

 

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