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OFDMA calibration results

Introduction

The official release of the 3.2.0 included the OFDMA module.

The calibration of the OFDMA module was based on the input from Qualcomm (STG(08)13 and STG(08)11) and the 3GPP TR 36.942.

The documentation on how to use the OFDMA module is available here

Procedure

The calibration procedure investigated sequentially the following sub-module:

1. Part 1: Path loss (OFDMA DL victim)
2. Part 2: Self interference or also called inter-system interference (i.e. without external interference) (OFDMA DL victim)
3. Part 3: External interference impact(OFDMA DL victim)
4. Part 4: Calibration/testing of the Victim OFDMA UL
5. Part 5: Final release of the module

The workspaces are available here for the UL and here for the DL.

Note: All the testing documentation of this work is available on the  http://www.ero.dk/download under [Group: SEAMCAT, Year: 2009] and relevant subfolders.

Propagation plugin model

For the calibration STG decided to use the 3GPP propagation model in order to be able to compare the results with the Qualcomm contributions.

• For the DL case the lognormal shadowing is included in the plugin model. It can be download here.
• For the UL case the lognormal sadowing is extracted from the plugin model (i.e. no variation), since the shadowing is consider in the SEAMCAT algorithm when the pathloss correlation is selected. This avoids to account for the shadowing twice. It can be download here.(Remember to save the .class plugin on the specific plugin folder before launching SEAMCAT).

Part 5: Final release

status: Approved for release in version 3.2.0

Part 4: UL module

At the STG19 meeting, STG decided to focus on the validation of the UL module.

status of this sub module: calibrated

ECO has drafted an interim UL calibration report of the implementation. Testers are welcome to consider this document to help them calibrating the UL

The following workspaces for UL and DL have been used to generate the following results:

• For UL OFDMA 10 MHz vs UL OFDMA 10 MHz

• For DL OFDMA 10 MHz vs DL OFDMA 10 MHz

The figure below demonstrates how to extract internal vectors from SEAMCAT, so that testers can compare SEAMCAT results with their expected value.

Part 3: DL module - External interference impact

STG members are invited to provide contribution for the STG19 (16-17 June 2009) for testing the external interference impact on the throughput loss of the OFDMA system.

In a view to the results (see doc with workspace), STG approved that the DL OFDMA-LTE module was validated due to the good matching results with 3GPP results.

status of this sub module: calibrated

Note that the DL algorithm when OFDMA is interferer has been modified (#145) as approved by STG.

Part 2: DL module - Self interference (inter-system interference)

In the STG meeting 17 (3-4 March 2009), STG preliminary concluded after correspondence communication with Qualcomm and resulting correction that the self-interference of the OFDMA DL module is in line with the Qualcomm simulator (DL only).

Document STG(09)4 summarises the procedure employed in Part 2 calibration.

Version 3.2.0 Beta9 version was released on 10 March 2009.

Status of this sub module: calibrated

Part 1: DL module - Path loss

In the STG meeting 16 (27 November 2008), document STG(08)29rev1 presented the part 1 process for the calibration of the OFDMA module.

Throughout the part1, several errors where found in the beta version.

Version 3.2.0 Beta8 was released on 19 December 2008

After the correction, the Path loss (hence the distribution of the users) was found to be acceptable compared to the Qualcomm internal results.

Status of this sub module: calibrated