# Vienna 5G Link Level Simulator **URL:** https://vccsforum.nt.tuwien.ac.at/c/vienna-5g-link-level-simulator/5.md [Latest](https://vccsforum.nt.tuwien.ac.at/latest.md) · [Categories](https://vccsforum.nt.tuwien.ac.at/categories.md) · [Tags](https://vccsforum.nt.tuwien.ac.at/tags.md) --- ## [New Release 1.3 - Vienna 5G LL Simulator](https://vccsforum.nt.tuwien.ac.at/t/new-release-1-3-vienna-5g-ll-simulator/181)
**Author:** [@Mariam](https://vccsforum.nt.tuwien.ac.at/u/Mariam)\ **Replies:** 2\ **Last updated:** [June 19, 2023, 7:39am UTC](https://vccsforum.nt.tuwien.ac.at/t/new-release-1-3-vienna-5g-ll-simulator/181 "2023-06-19T07:39:57Z")
Dear Community, We are happy to announce a new release of the Vienna 5G Link Level Simulator, that is version 1.3. The simulator is provided for free under an academic, non-commercial use license. For this, please cons… --- ## [Welcome to the Vienna 5G Link Level Simulator Forum](https://vccsforum.nt.tuwien.ac.at/t/welcome-to-the-vienna-5g-link-level-simulator-forum/13)
**Author:** [@system](https://vccsforum.nt.tuwien.ac.at/u/system)\ **Replies:** 0\ **Last updated:** [September 14, 2021, 2:49pm UTC](https://vccsforum.nt.tuwien.ac.at/t/welcome-to-the-vienna-5g-link-level-simulator-forum/13 "2021-09-14T14:49:09Z")
Welcome to our new online forum. Here, you can post your questions and feedback regarding the Vienna 5G Link Level Simulator. In order to make sure that you never miss an update on the simulator, we ask you to subscribe… --- ## [Forum Etiquette](https://vccsforum.nt.tuwien.ac.at/t/forum-etiquette/20)
**Author:** [@system](https://vccsforum.nt.tuwien.ac.at/u/system)\ **Replies:** 0\ **Last updated:** [September 15, 2021, 6:40am UTC](https://vccsforum.nt.tuwien.ac.at/t/forum-etiquette/20 "2021-09-15T06:40:43Z")
When using this forum, please stick to the following etiquette https://wiki.archlinux.org/index.php/Forum\_etiquette --- ## [On the compilation of Mex files under Linux systems](https://vccsforum.nt.tuwien.ac.at/t/on-the-compilation-of-mex-files-under-linux-systems/15)
**Author:** [@system](https://vccsforum.nt.tuwien.ac.at/u/system)\ **Replies:** 0\ **Last updated:** [September 14, 2021, 3:19pm UTC](https://vccsforum.nt.tuwien.ac.at/t/on-the-compilation-of-mex-files-under-linux-systems/15 "2021-09-14T15:19:01Z")
As the channel decoder of the simulator is implemented in C++ and compiled to .Mex files, we offer already compiled ones for 64-bit Microsoft Windows in the simulator download page. These files are platform-specific and … --- ## [What is the girth of 5G NR LDPC code?](https://vccsforum.nt.tuwien.ac.at/t/what-is-the-girth-of-5g-nr-ldpc-code/489)
**Author:** [@c1119](https://vccsforum.nt.tuwien.ac.at/u/c1119)\ **Replies:** 9\ **Last updated:** [June 10, 2025, 11:25am UTC](https://vccsforum.nt.tuwien.ac.at/t/what-is-the-girth-of-5g-nr-ldpc-code/489 "2025-06-10T11:25:16Z")
I searched the web and could not find any reference on the girth of 5G NR LDPC code. Could someone please help me? --- ## [Path Loss Model in RIS scenario](https://vccsforum.nt.tuwien.ac.at/t/path-loss-model-in-ris-scenario/430)
**Author:** [@RoaaAli](https://vccsforum.nt.tuwien.ac.at/u/RoaaAli)\ **Replies:** 11\ **Last updated:** [May 20, 2025, 4:16pm UTC](https://vccsforum.nt.tuwien.ac.at/t/path-loss-model-in-ris-scenario/430 "2025-05-20T16:16:15Z")
Hi sir, I actived scStr.topology.geometricLayout =true and use pathloss model type =urban what effect does these prameters when choose urban scStr.simulation.pathLossModel.alpha = 1; scStr.simulation.path… --- ## [Channel matrix](https://vccsforum.nt.tuwien.ac.at/t/channel-matrix/196)
**Author:** [@walaa\_hussein](https://vccsforum.nt.tuwien.ac.at/u/walaa_hussein)\ **Replies:** 2\ **Last updated:** [December 2, 2024, 7:53am UTC](https://vccsforum.nt.tuwien.ac.at/t/channel-matrix/196 "2024-12-02T07:53:23Z")
hi, i have question about your simulator 5g link level …when i run the generic senior the results just BER or throuhgput or mse for up or downlink so i need the values of channel matrix , frequencies and time slot . ca… --- ## [RIS phase shift and beamforming matrix](https://vccsforum.nt.tuwien.ac.at/t/ris-phase-shift-and-beamforming-matrix/447)
**Author:** [@walaa\_hussein](https://vccsforum.nt.tuwien.ac.at/u/walaa_hussein)\ **Replies:** 1\ **Last updated:** [November 11, 2024, 2:37pm UTC](https://vccsforum.nt.tuwien.ac.at/t/ris-phase-shift-and-beamforming-matrix/447 "2024-11-11T14:37:56Z")
dear sir, i have questions about the RIS scenario : First the RIS elements all passive or we can change to semi-passive . second i want to know how you calculate the phase shift matrix (its random)and beamforming … give … --- ## [RIS Scenario](https://vccsforum.nt.tuwien.ac.at/t/ris-scenario/414)
**Author:** [@RoaaAli](https://vccsforum.nt.tuwien.ac.at/u/RoaaAli)\ **Replies:** 8\ **Last updated:** [October 15, 2024, 10:52am UTC](https://vccsforum.nt.tuwien.ac.at/t/ris-scenario/414 "2024-10-15T10:52:41Z")
Hi sir, I chose modulation.precoding=‘digital’ ,when i implement ,appear Warning: For fully digital precoding the number of port is set equal to the number of antennas In Parameters/SimulationParameters/checkParamete… --- ## [A question about simulation in precoded case](https://vccsforum.nt.tuwien.ac.at/t/a-question-about-simulation-in-precoded-case/326)
**Author:** [@c1119](https://vccsforum.nt.tuwien.ac.at/u/c1119)\ **Replies:** 11\ **Last updated:** [April 8, 2024, 6:30am UTC](https://vccsforum.nt.tuwien.ac.at/t/a-question-about-simulation-in-precoded-case/326 "2024-04-08T06:30:01Z")
I’m very confused about the meaning of this sentence in 4.4.2 of 3GPP TS 38.101-4: “The above SNR definition assumes that the REs are not precoded, and does not account for any gain which can be associated to the precodi… --- ## [BER comparison of convolutional codes, Turbo codes, LDPC codes, and Polar codes](https://vccsforum.nt.tuwien.ac.at/t/ber-comparison-of-convolutional-codes-turbo-codes-ldpc-codes-and-polar-codes/317)
**Author:** [@stren](https://vccsforum.nt.tuwien.ac.at/u/stren)\ **Replies:** 4\ **Last updated:** [February 29, 2024, 11:13am UTC](https://vccsforum.nt.tuwien.ac.at/t/ber-comparison-of-convolutional-codes-turbo-codes-ldpc-codes-and-polar-codes/317 "2024-02-29T11:13:44Z")
In shortBlockChannelCoding. m, there are only modulation methods such as QAM/bpsk/QPSK. If I want to use OFDM modulation, how should I modify the code? --- ## [Channel Estimation](https://vccsforum.nt.tuwien.ac.at/t/channel-estimation/328)
**Author:** [@stren](https://vccsforum.nt.tuwien.ac.at/u/stren)\ **Replies:** 1\ **Last updated:** [February 26, 2024, 8:43am UTC](https://vccsforum.nt.tuwien.ac.at/t/channel-estimation/328 "2024-02-26T08:43:54Z")
Hello, I would like to use ‘PilotSymbolAidedChannelEstimation’ for OTFS modulation based channel estimation, but I am not very familiar with this class. Do you have any suggestions? The following code is something I ha… --- ## [3D spatial channel model](https://vccsforum.nt.tuwien.ac.at/t/3d-spatial-channel-model/325)
**Author:** [@Susovan](https://vccsforum.nt.tuwien.ac.at/u/Susovan)\ **Replies:** 5\ **Last updated:** [February 26, 2024, 8:33am UTC](https://vccsforum.nt.tuwien.ac.at/t/3d-spatial-channel-model/325 "2024-02-26T08:33:19Z")
Dear Sir/Madam, I am implementing a V2I scenario where I want to implement CDL channel models described in 3GPP 38.901. To do that I am using 3D Spatial Channel Model which is already implemented here. But I’m getting t… --- ## [Could LDPC code achieve rate compatibility?](https://vccsforum.nt.tuwien.ac.at/t/could-ldpc-code-achieve-rate-compatibility/316)
**Author:** [@stren](https://vccsforum.nt.tuwien.ac.at/u/stren)\ **Replies:** 3\ **Last updated:** [January 22, 2024, 12:18pm UTC](https://vccsforum.nt.tuwien.ac.at/t/could-ldpc-code-achieve-rate-compatibility/316 "2024-01-22T12:18:32Z")
(1) May I ask if LDPC code can achieve rate compatibility? For example, can the bit rate be set to R=1/2, 1/3, 2/3 for the same input information length K=1000? (2) If possible, may I ask what theory was used to impleme… --- ## [shortBlockChannelCoding](https://vccsforum.nt.tuwien.ac.at/t/shortblockchannelcoding/309)
**Author:** [@stren](https://vccsforum.nt.tuwien.ac.at/u/stren)\ **Replies:** 9\ **Last updated:** [January 16, 2024, 6:28pm UTC](https://vccsforum.nt.tuwien.ac.at/t/shortblockchannelcoding/309 "2024-01-16T18:28:50Z")
At present, there are some problems: (1) After the signal-to-noise ratio is greater than 0, the error rate or frame error rate line drops sharply. When the signal-to-noise ratio is greater than 4dB, the error rate o… --- ## [Signal to noise ratio, information length, and bit rate](https://vccsforum.nt.tuwien.ac.at/t/signal-to-noise-ratio-information-length-and-bit-rate/312)
**Author:** [@stren](https://vccsforum.nt.tuwien.ac.at/u/stren)\ **Replies:** 0\ **Last updated:** [December 27, 2023, 8:28am UTC](https://vccsforum.nt.tuwien.ac.at/t/signal-to-noise-ratio-information-length-and-bit-rate/312 "2023-12-27T08:28:57Z")
in shortBlockChannelCoding.m. Now there is a new problem that arises when I set the parameter SNR: 0:1:10;,K=48000;,R=2/3,numR=10000. when the signal-to-noise ratio is greater than 4dB, only the convolutional code ha… --- ## [RIS Scenario Throughput](https://vccsforum.nt.tuwien.ac.at/t/ris-scenario-throughput/276)
**Author:** [@farhankhan](https://vccsforum.nt.tuwien.ac.at/u/farhankhan)\ **Replies:** 1\ **Last updated:** [August 7, 2023, 6:38am UTC](https://vccsforum.nt.tuwien.ac.at/t/ris-scenario-throughput/276 "2023-08-07T06:38:26Z")
Why the UE and BS throughputs are identical in RIS Scenario example? Can you please elaborate? --- ## [Question in F-OFDM](https://vccsforum.nt.tuwien.ac.at/t/question-in-f-ofdm/273)
**Author:** [@Mohamed](https://vccsforum.nt.tuwien.ac.at/u/Mohamed)\ **Replies:** 0\ **Last updated:** [August 2, 2023, 10:19pm UTC](https://vccsforum.nt.tuwien.ac.at/t/question-in-f-ofdm/273 "2023-08-02T22:19:32Z")
Dear Sir, I have a question about F-OFDM class. Please can you tell me what is the difference between (obj.PHY.CyclicPrefixLength) and (obj.PHY.CyclicPrefixLengthFilter) and also what is the relation between (obj.PHY.Cy… --- ## [A question about the simulation setup in a paper](https://vccsforum.nt.tuwien.ac.at/t/a-question-about-the-simulation-setup-in-a-paper/261)
**Author:** [@c1119](https://vccsforum.nt.tuwien.ac.at/u/c1119)\ **Replies:** 8\ **Last updated:** [July 31, 2023, 7:08am UTC](https://vccsforum.nt.tuwien.ac.at/t/a-question-about-the-simulation-setup-in-a-paper/261 "2023-07-31T07:08:01Z")
Sorry that the question is not directly connected to Vienna but to link level simulation. Has someone tried to reproduce the simulation results in fig. 14 in the paper “An overview of channel coding for 5G NR cellular co… --- ## [NOMA scenario adaptation for different CQI table and uplink](https://vccsforum.nt.tuwien.ac.at/t/noma-scenario-adaptation-for-different-cqi-table-and-uplink/250)
**Author:** [@pivacdzana](https://vccsforum.nt.tuwien.ac.at/u/pivacdzana)\ **Replies:** 5\ **Last updated:** [July 10, 2023, 10:36pm UTC](https://vccsforum.nt.tuwien.ac.at/t/noma-scenario-adaptation-for-different-cqi-table-and-uplink/250 "2023-07-10T22:36:20Z")
Dear VCCS team, I am working on testing different NOMA scenarios in LL v1.2. I have a few questions. I see that the number of bits that are used in simulation can be found in user results as nCodeBits. Is there a way … --- ## [How can I get Vienna LTE system level simulator (v1-9-Q1-2016) or its later counterparts?](https://vccsforum.nt.tuwien.ac.at/t/how-can-i-get-vienna-lte-system-level-simulator-v1-9-q1-2016-or-its-later-counterparts/259)
**Author:** [@Oscar](https://vccsforum.nt.tuwien.ac.at/u/Oscar)\ **Replies:** 1\ **Last updated:** [July 4, 2023, 5:33am UTC](https://vccsforum.nt.tuwien.ac.at/t/how-can-i-get-vienna-lte-system-level-simulator-v1-9-q1-2016-or-its-later-counterparts/259 "2023-07-04T05:33:30Z")
Dear researchers, I found that the Vienna 5G Link Level Simulator does not support carrier aggregation yet. But, Vienna LTE system level simulator (v1-9-Q1-2016) supported carrier aggregation. For a reference to carr… --- ## [Pilot pattern](https://vccsforum.nt.tuwien.ac.at/t/pilot-pattern/228)
**Author:** [@walaa\_hussein](https://vccsforum.nt.tuwien.ac.at/u/walaa_hussein)\ **Replies:** 4\ **Last updated:** [June 5, 2023, 5:32am UTC](https://vccsforum.nt.tuwien.ac.at/t/pilot-pattern/228 "2023-06-05T05:32:58Z")
Dear sir I have questions about how to design a new pilot pattern for noisy channel pilot aided please Best regards --- ## [A new pilot pattern](https://vccsforum.nt.tuwien.ac.at/t/a-new-pilot-pattern/251)
**Author:** [@walaa\_hussein](https://vccsforum.nt.tuwien.ac.at/u/walaa_hussein)\ **Replies:** 1\ **Last updated:** [June 2, 2023, 5:07am UTC](https://vccsforum.nt.tuwien.ac.at/t/a-new-pilot-pattern/251 "2023-06-02T05:07:51Z")
how to design a new pilot pattern, i wanna to inform me how to design a novel pilot pattern to me scenario , how to add a new design --- ## [Flexible Numerology scenario](https://vccsforum.nt.tuwien.ac.at/t/flexible-numerology-scenario/238)
**Author:** [@Mohamed](https://vccsforum.nt.tuwien.ac.at/u/Mohamed)\ **Replies:** 3\ **Last updated:** [April 27, 2023, 9:03am UTC](https://vccsforum.nt.tuwien.ac.at/t/flexible-numerology-scenario/238 "2023-04-27T09:03:57Z")
Dear Sir, \*\*When I tried to run flexibleNumerology scenario using main.m script, I got an error in the case of using 15kHz subcarrier spacing. \*\* I changed the parameter in the scenario like that: % numerology setup:… --- ## [May I ask a question about 3gpp ts 38.212?](https://vccsforum.nt.tuwien.ac.at/t/may-i-ask-a-question-about-3gpp-ts-38-212/222)
**Author:** [@c1119](https://vccsforum.nt.tuwien.ac.at/u/c1119)\ **Replies:** 9\ **Last updated:** [March 9, 2023, 1:05pm UTC](https://vccsforum.nt.tuwien.ac.at/t/may-i-ask-a-question-about-3gpp-ts-38-212/222 "2023-03-09T13:05:46Z")
In subclause 5.4.2.1, C in the equation of Nref refers to the number of code blocks of the transport block. But it is not very clear to me if “the transport block” means the transport block under channel coding, or the t… --- ## [NOMA Scenario error with using ML receiver](https://vccsforum.nt.tuwien.ac.at/t/noma-scenario-error-with-using-ml-receiver/211)
**Author:** [@pivacdzana](https://vccsforum.nt.tuwien.ac.at/u/pivacdzana)\ **Replies:** 2\ **Last updated:** [January 26, 2023, 10:40pm UTC](https://vccsforum.nt.tuwien.ac.at/t/noma-scenario-error-with-using-ml-receiver/211 "2023-01-26T22:40:50Z")
Hello VCCS team, I am trying to run the NOMA scenario with default parameters that are presented in the simulator. My goal is to adapt default NOMA scenario to work with ML receiver, but I seem to run into an error. If … --- ## [MultiLink Scenario adaptation for 3 users](https://vccsforum.nt.tuwien.ac.at/t/multilink-scenario-adaptation-for-3-users/207)
**Author:** [@pivacdzana](https://vccsforum.nt.tuwien.ac.at/u/pivacdzana)\ **Replies:** 9\ **Last updated:** [January 19, 2023, 11:04am UTC](https://vccsforum.nt.tuwien.ac.at/t/multilink-scenario-adaptation-for-3-users/207 "2023-01-19T11:04:30Z")
Hello VCCS team, I am trying to adapt multiLink scenario for 3 users with different numerologies (15, 30 and 60kHz) use case. I am trying to do SINR analysis of the system and calculate longterm average SINR for each us… --- ## [Throughput in multilink](https://vccsforum.nt.tuwien.ac.at/t/throughput-in-multilink/202)
**Author:** [@Mohamed](https://vccsforum.nt.tuwien.ac.at/u/Mohamed)\ **Replies:** 1\ **Last updated:** [December 19, 2022, 7:05am UTC](https://vccsforum.nt.tuwien.ac.at/t/throughput-in-multilink/202 "2022-12-19T07:05:08Z")
Dear Sir, Please can you help me to find the part of code which calculate the uplink and downlink throughput. Best regards, Mohamed --- ## [Custom Beamforming Vectors](https://vccsforum.nt.tuwien.ac.at/t/custom-beamforming-vectors/182)
**Author:** [@LucaB](https://vccsforum.nt.tuwien.ac.at/u/LucaB)\ **Replies:** 2\ **Last updated:** [October 27, 2022, 9:43am UTC](https://vccsforum.nt.tuwien.ac.at/t/custom-beamforming-vectors/182 "2022-10-27T09:43:18Z")
I have a couple of questions about the Link-level Simulator. I hope you can help me. I would like to place multiple BSs at given positions that collaborate to serve a single UE(vehicle) that is moving along a straight l… --- ## [How to Use GFDM](https://vccsforum.nt.tuwien.ac.at/t/how-to-use-gfdm/101)
**Author:** [@dkray](https://vccsforum.nt.tuwien.ac.at/u/dkray)\ **Replies:** 3\ **Last updated:** [October 3, 2022, 8:21am UTC](https://vccsforum.nt.tuwien.ac.at/t/how-to-use-gfdm/101 "2022-10-03T08:21:51Z")
GFDM is there in the Modulation folder, but every time i use it shows error. it cant be used then why its there in the first place.? [Next page](https://vccsforum.nt.tuwien.ac.at/c/vienna-5g-link-level-simulator/5.md?page=1)