Impact of Impaired Hardware on Reciprocity-based Beamforming
Hilander, Lasse (2023)
2023
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Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:amk-2023053116778
https://urn.fi/URN:NBN:fi:amk-2023053116778
Tiivistelmä
The purpose of this thesis is to find the threshold, after which the impaired antenna hardware on the case company’s fifth generation testbed renders the test results unfit for use. The case company has a long, almost 150-year history in telecommunication, both as a telephone and mobile phone manufacturer but also as a wireless network product vendor. Today, it stands as one of the leading providers of Information and Communication Technology.
The way of testing the threshold was done with a purposely build script which enabled the simulation of faulty antenna ports. Different number of faulty antenna port scenarios where then tested, both in a fixed location and with a moving test van. Results were then post processed with Matlab to get the figures used for the final analysis.
The importance in finding this threshold is critical to have a good understanding about the capabilities of the testbed and specifically the antenna side of the base station which was the focus here.
The analysis shows, that isolating the results for this kind of fault from other effects from the environment is extremely complicated, especially when testing is performed over the air. But what was found that the previous assumptions, which were the starting point of this thesis, were quite accurate and those can be adjusted slightly to target the current specifications of the latest version of testbed. The thesis also makes suggestions to increase more focused testing in this part to gain better understanding of the extent and frequency of this kind of fault.
The result of this thesis was a very useful insight into the status of one specific test environment and its present issues at the time. However, the observations deduced from these results are only relevant to a very confined scope of other similar test systems. As all the test systems are individuals and have too many variables for direct comparison. Nevertheless, the used methods and techniques in the thesis can be used in similar testing in other places to determine correspondence between the results.
The way of testing the threshold was done with a purposely build script which enabled the simulation of faulty antenna ports. Different number of faulty antenna port scenarios where then tested, both in a fixed location and with a moving test van. Results were then post processed with Matlab to get the figures used for the final analysis.
The importance in finding this threshold is critical to have a good understanding about the capabilities of the testbed and specifically the antenna side of the base station which was the focus here.
The analysis shows, that isolating the results for this kind of fault from other effects from the environment is extremely complicated, especially when testing is performed over the air. But what was found that the previous assumptions, which were the starting point of this thesis, were quite accurate and those can be adjusted slightly to target the current specifications of the latest version of testbed. The thesis also makes suggestions to increase more focused testing in this part to gain better understanding of the extent and frequency of this kind of fault.
The result of this thesis was a very useful insight into the status of one specific test environment and its present issues at the time. However, the observations deduced from these results are only relevant to a very confined scope of other similar test systems. As all the test systems are individuals and have too many variables for direct comparison. Nevertheless, the used methods and techniques in the thesis can be used in similar testing in other places to determine correspondence between the results.