Aeroflex IQCreator software enables waveform files to be created that comply with the requirements for receiver conformance testing.

Transcription

1 Application Note Performing LTE FDD (SC) Base Station Receiver Measurements using Aeroflex pre-set.iqs files in accordance with the requirements of ETSI TS section 7.2 to 7.8 (excluding 7.7) Introduction Aeroflex IQCreator software enables waveform files to be created that comply with the requirements for receiver conformance testing. Aeroflex can supply the settings files (extension.iqs) which when opened in IQCreator can be packaged for use in conjunction with Aeroflex PXI 3000 and S Series signal generators. This document assumes the reader is familiar with the various receiver test cases 7.2 to 7.8. For information on IQCreator read the IQCreator user guide. This document describes the waveform files that are provided for 5 MHz, 10 MHz and 20 MHz bandwidths. The signal generator settings in terms of level and frequency are discussed. For a complete definition of frequency and level relationships between wanted and interferer signals ref to ETSI TS section 7. Filenames Filenames used throughout provide a description of the waveform content. afltedownlinkber_fdd_10mhz_frc_a1_3_start_25.aiq This translates to: LTE downlink, FDD duplex mode, 10 MHz bandwidth, Fixed Reference Channel, TS Annex A1-3 with a Resource Block offset of 25

2 7.2 Reference sensitivity level The wanted signal waveform is chosen according to the signal bandwidth () and the Resource Block () offset as shown below. For signal bandwidths above 5 MHz measurement is repeated for each resource block () offset value. The waveforms provided use a cell ID of 1 and a RNTI of 1024 Wanted Signal File Name 5 0 afltedownlinkber_fdd_5mhz_frc_a1_3.aiq 10 0 afltedownlinkber_fdd_10mhz_frc_a1_3.aiq 25 afltedownlinkber_fdd_10mhz_frc_a1_3_start_25.aiq 0 afltedownlinkber_fdd_20mhz_frc_a1_3.aiq afltedownlinkber_fdd_20mhz_frc_a1_3_start_25.aiq 50 afltedownlinkber_fdd_20mhz_frc_a1_3_start_50.aiq 75 afltedownlinkber_fdd_20mhz_frc_a1_3_start_75.aiq

3 7.3 Dynamic range Signals Combined at Rx Antenna Signals Combined in baseband This test requires both a Wanted signal and an Interferer signal to be played. The wanted signal and interferer should be chosen form the following. For signal bandwidths above 5 MHz measurement is repeated using a wanted signal with different resource block () offsets. The waveforms provided use a cell ID of 1 and a RNTI of 1024 Wanted Signal File Name Interferer Signal File Name C/N (db) 5 0 afltedownlinkber_fdd_5mhz_f RC_A2_3.aiq afltedownlinkber_ 5MHz_AWGN.aiq afltedownlinkber_fdd_10mhz_ FRC_A2_3.aiq afltedownlinkber_fdd_10mhz_ FRC_A2_3_Start_25.aiq afltedownlinkber_ 10MHz_AWGN.aiq afltedownlinkber_fdd_20mhz_ FRC_A2_3.aiq afltedownlinkber_fdd_20mhz_ FRC_A2_3_Start_25.aiq afltedownlinkber_fdd_20mhz_ FRC_A2_3_Start_50.aiq afltedownlinkber_ 20MHz_AWGN.aiq afltedownlinkber_fdd_20mhz_ FRC_A2_3_Start_75.aiq

4 The centre frequency of the interferer should be same as the centre frequency of the LTE channel (regardless of which offset is being tested). The wanted and interferer signals can either be played from independent signal generators and combined at the receiver antenna input or they may be combined into a composite baseband waveform using the multi-carrier facility in IQCreator. When combined as a composite baseband signal so the power of the interferer signal must be set higher than the power of the wanted signal by a level equal to the value indicated in column C/N (db).

5 7.4 In-channel selectivity Signals Combined at Rx Antenna Signals Combined in baseband This test requires both a wanted signal and an interferer signal to be played. Both signals will be played at the same centre frequency. The signals do not overlap in the frequency domain because the interfering signal uses a set of resource blocks adjacent to the wanted signal. This test should be carried out with the wanted signal above, and below the interferer signal. The waveforms provided use a cell ID of 1. The wanted waveforms use a RNTI of 1024, and the interference waveforms use a RNTI of 100. The RNTI of the wanted signal must be different to that of the interference wave form to ensure the signals do not correlate. The interferer signal filenames are: A B C D E F afltedownlinkber_fdd_5mhz_frc_a1_2_16qam_interferer.aiq afltedownlinkber_fdd_5mhz_frc_a1_2_16qam_interferer_start_15.aiq afltedownlinkber_fdd_10mhz_frc_a1_3_16qam_interferer.aiq afltedownlinkber_fdd_10mhz_frc_a1_3_16qam_interferer_start_25.aiq afltedownlinkber_fdd_20mhz_frc_a1_3_16qam_interferer_start_25.aiq afltedownlinkber_fdd_20mhz_frc_a1_3_16qam_interferer_start_50.aiq

6 Wanted signal frequency below the interferer Number Of s Wanted Signal File Name Interfering Signal Rel (db) afltedownlinkber_fdd_5mhz_frc_a1_2. aiq B afltedownlinkber_fdd_10mhz_frc_a1_ 3.aiq D afltedownlinkber_fdd_20mhz_frc_a1_ 3_Start_25.aiq F Wanted signal frequency Above the interferer Number Of s Wanted Signal Interfering Signal Rel (db) afltedownlinkber_fdd_5mhz_frc_a1_2 _Start_10.aiq A afltedownlinkber_fdd_10mhz_frc_a1_ 3_Start_25.aiq C afltedownlinkber_fdd_20mhz_frc_a1_ 3_Start_50.aiq E The wanted and interferer signals can either be played from independent signal generators and combined at the receiver antenna input or they may be combined into a composite baseband waveform using the multi-carrier facility in IQCreator. When combined as a composite baseband signal so the power of the interferer signal must be set higher than the power of the wanted signal by a level equal to the value indicated in column Rel (db).

7 7.5 Adjacent Channel Selectivity (ACS) and narrowband blocking This test requires both a wanted signal and an interferer signal to be played. The relative level difference between the wanted and interferer signal makes it necessary to use independent VSGs for each and the RF outputs summed at the receiver antenna input. The interfering signal can be positioned above or below the wanted signal. The waveforms provided use a cell ID of 1. The wanted waveforms use a RNTI of 1024, and the interference waveforms use a RNTI of 100. The RNTI of the wanted signal must be different to that of the interference wave form to ensure the signals do not correlate. The following table shows the waveforms that should be used when the interferer is above or below the interferer Interferer (Above / Below) 5 Any Below 0 Above 25 Below 0 Above 75 Wanted Signal File Name afltedownlinkber_fdd_5mhz_frc _A1_3.aiq afltedownlinkber_fdd_10mhz_fr C_A1_3.aiq afltedownlinkber_fdd_10mhz_fr C_A1_3_Start_25.aiq afltedownlinkber_fdd_20mhz_fr C_A1_3.aiq afltedownlinkber_fdd_20mhz_fr C_A1_3_Start_75.aiq Interferer File Name afltedownlinkber_fdd_5m Hz_FRC_A1_3_QPSK_Inte rferer.aiq The following table shows the differences in centre frequencies between the wanted signal and the interferer.

8 Wanted Signal Gap between Wanted and Interferer Signal Edges (khz) Interferer centre frequency from wanted centre frequency - Lower (Below) Upper (Above) For Narrow band blocking the wanted signal is unchanged but the interfering waveform has only one resource block () active at a time. For 5 10, (15) and 20 MHz signals, offsets of m = 0, 1, 2, 3, 4, 9, 14, 19, and 24 should be used. The following table shows which waveform to use for each value of m. m Higher Edge (Above) m Lower Edge (Below) Interferer File Name afltedownlinkber_fdd_5mhz_frc_a1_3_qpsk_interferer 0.aiq 1 1 n/a afltedownlinkber_fdd_5mhz_frc_a1_3_qpsk_interferer 1.aiq 2 2 n/a afltedownlinkber_fdd_5mhz_frc_a1_3_qpsk_interferer 2.aiq 3 3 n/a afltedownlinkber_fdd_5mhz_frc_a1_3_qpsk_interferer 3.aiq 4 4 n/a afltedownlinkber_fdd_5mhz_frc_a1_3_qpsk_interferer 4.aiq 5 n/a 19 afltedownlinkber_fdd_5mhz_frc_a1_3_qpsk_interferer 5.aiq 9 9 n/a afltedownlinkber_fdd_5mhz_frc_a1_3_qpsk_interferer 9.aiq 10 n/a 14 afltedownlinkber_fdd_5mhz_frc_a1_3_qpsk_interferer 10.aiq n/a afltedownlinkber_fdd_5mhz_frc_a1_3_qpsk_interferer 14.aiq 15 n/a 9 afltedownlinkber_fdd_5mhz_frc_a1_3_qpsk_interferer 15.aiq n/a afltedownlinkber_fdd_5mhz_frc_a1_3_qpsk_interferer 19.aiq 20 n/a 4 afltedownlinkber_fdd_5mhz_frc_a1_3_qpsk_interferer 20.aiq 21 n/a 3 afltedownlinkber_fdd_5mhz_frc_a1_3_qpsk_interferer 21.aiq 22 n/a 2 afltedownlinkber_fdd_5mhz_frc_a1_3_qpsk_interferer 22.aiq 23 n/a 1 afltedownlinkber_fdd_5mhz_frc_a1_3_qpsk_interferer 23.aiq afltedownlinkber_fdd_5mhz_frc_a1_3_qpsk_interferer 24.aiq

9 7.6 Blocking This test requires both a wanted signal and an interferer signal to be played. The relative level difference between the wanted and interferer signal makes is necessary to use independent VSGs for each and the RF outputs summed at the receiver antenna input. The interfering signal can be positioned above or below the wanted signal. The waveforms provided use a cell ID of 1. The wanted waveforms use a RNTI of 1024, and the interference waveforms use a RNTI of 100. The RNTI of the wanted signal must be different to that of the interference wave form to ensure the signals do not correlate. The table below shows the wave form that should be used for In Band Blocking when the interferer is above or below the interferer. The wanted signal used should be the lowest and highest supported. A CW signal replaces this waveform when testing Out of band Blocking plus the wanted signal is replaced with one with the lowest bandwidth supported.

10 Interferer Position (Above / Below) Wanted signal Wanted Signal File Name Interferer File Name 5 Any 0 afltedownlinkber_fdd_5mhz_f RC_A1_3.aiq Below 0 afltedownlinkber_fdd_10mhz_ FRC_A1_3.aiq 10 Above 25 afltedownlinkber_fdd_10mhz_ FRC_A1_3_Start_25.aiq afltedownlinkber_fdd_5mhz_f RC_A1_3_QPSK_Interferer.aiq Below 0 afltedownlinkber_fdd_20mhz_ FRC_A1_3aiq 20 Above 75 afltedownlinkber_fdd_20mhz_ FRC_A1_3_Start_75.aiq The specification specifies the frequency offsets at which the test should be carried out. The starting frequency offsets are defined in the following table Wanted Signal Interferer Signal Gap between Wanted and Interferer Signal Edges Interferer centre frequency from wanted centre frequency - Lower (Below) Upper (Above) The frequency offset is increased (or decreased when the interferer is below the wanted signal) In steps of 1 MHz. Tables 7.6-1, 7.6-1a, 7.6-x of the specification show the range of frequency offsets that should be tested, and whether a CW or LTE signal should be used.

11 7.8 intermodulation Baseband and RF Combining RF Combining This test requires both a wanted signal and interferer signals to be played. The relative level difference between the wanted and interferer signals makes is necessary to use independent VSGs for each and the RF outputs summed at the receiver antenna input. The interfering signals can be positioned above or below the wanted signal. The waveforms provided use a cell ID of 1. The wanted waveforms use a RNTI of 1024, and the interference waveforms use a RNTI of 100. The RNTI of the wanted signal must be different to that of the interference wave form to ensure the signals do not correlate. The intermodulation tests require the CW signal to be combined with the interferer. Signal combination can be performed either in baseband or at RF.

12 The following table shows the wanted signal waveforms that should be used. Interferer Position (Above / Below) Wanted signal Wanted Signal File Name Modulated Interferer File Name 5 Any 0 afltedownlinkber_fdd_5mhz_ FRC_A1_3.aiq 10 Below 0 Above 25 afltedownlinkber_fdd_10mhz _FRC_A1_3.aiq afltedownlinkber_fdd_10mhz _FRC_A1_3_Start_25.aiq afltedownlinkber_fdd_5mhz _FRC_A1_3_QPSK_Interferer. aiq 20 Below 0 Above 75 afltedownlinkber_fdd_20mhz _FRC_A1_3aiq afltedownlinkber_fdd_20mhz _FRC_A1_3_Start_75.aiq Intermodulation Performance The following table shows the centre frequency offsets of the CW and interfering signal for intermodulation performance Wanted Signal CW centre frequency from wanted centre frequency - Lower (Below) Upper (Above) Interferer centre frequency from wanted centre frequency - Lower (Below) Upper (Above)

13 Narrowband intermodulation The interfering signal used for narrowband intermodulation has only one active resource block. The following table shows the centre frequency offsets used to transmit the interfering signal Wanted Signal 5 Interferer Signal Interferer centre frequency from wanted centre frequency - Lower (Below) Upper (above) The following table shows the offset required to give the required centre frequency specified in the specification. Wanted Signal 5 Interferer Signal Interferer signal offset lower upper Wide Local Home Wide Local Home

14 The following table specifies the files to use for each of the offsets specified in the previous table. Modulated interferer filename 4 afltedownlinkber_fdd_5mhz_frc_a1_3_qpsk_interferer 4.aiq 4 afltedownlinkber_fdd_5mhz_frc_a1_3_qpsk_interferer 5.aiq 6 afltedownlinkber_fdd_5mhz_frc_a1_3_qpsk_interferer 6.aiq 7 afltedownlinkber_fdd_5mhz_frc_a1_3_qpsk_interferer 7.aiq 8 afltedownlinkber_fdd_5mhz_frc_a1_3_qpsk_interferer 8.aiq 16 afltedownlinkber_fdd_5mhz_frc_a1_3_qpsk_interferer 16.aiq 17 afltedownlinkber_fdd_5mhz_frc_a1_3_qpsk_interferer 17.aiq 18 afltedownlinkber_fdd_5mhz_frc_a1_3_qpsk_interferer 18.aiq 19 afltedownlinkber_fdd_5mhz_frc_a1_3_qpsk_interferer 19.aiq 20 afltedownlinkber_fdd_5mhz_frc_a1_3_qpsk_interferer 20.aiq The following table shows the centre frequency offsets of the CW signal when performing the narrowband intermodulation test. Wanted Signal 5 Interferer Signal CW centre frequency offset khz lower upper Wide Local Home Wide Local Home

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