To study Pilot Contamination

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  • #15221
    Narendra Deconda
    Participant

    Hi,

    I am studying the effect of Pilot Contamination on Channel Estimation in Multicell MU-MIMO systems. Pilot Contamination is caused by transmitting non-orthogonal pilot sequences for channel estimation.

    Is it possible to simulate this using Vienna 5G Link Level simulator? I looked into the Channel Estimation part of the user manual. I understood that any of the predefined pilot patterns ‘LTE downlink’, ‘Diamond’, ‘Rectangular’ and ‘LTE uplink’ can’t be used to transmit non-orthogonal pilots.

    I am looking forward to your suggestions.

    #15222

    Hi,

    please consider +ChannelEstimation/PilotSymbolAidedChannelEstimation.m. There, the pilot symbols and their allocations is implemented.

    To simulate the effects of pilot symbol contamination, you should use orthogonal pilot symbols within a cell. For this, use the LTE Uplink pilot symbol pattern and orthogonal pilot symbols with a sequence length of at least the number of users in a cell. With this setting I think the pilot symbols in between different cells will not be orthogonal which should lead to exactly what you are looking for. Then you may adjust the inter-link attenuation to obtain different levels of inter-cell interference.

    Of course it is also possible to implement your own pilot allocation pattern and orthogonal pilot symbols.

    Please also consider whether you want to simulate in TDD or FDD mode.

    kind regards
    Stefan Pratschner

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