Massive MIMO Simulation – Path loss

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  • #15137
    Farhan
    Participant

    Hi,

    In Massive MIMO scenario, the Use velocity is 15 Km/h showing user’s are moving, whereas a fixed pathloss of 100 is set with PDP of PadestrianA. Assuming, If the user is moving why it’s pathloss is fixed? Won’t it change with the distance?

    Regards,
    Farhan

    #15138
    Mariam Mussbah
    Keymaster

    Dear Farhan,

    The path loss is an input parameter. If you want the path loss to change, you have to sweep over the path loss.

    Best,
    Mariam

    #15188
    Farhan
    Participant

    For the downlink, three schemes are supported: ZF, Block Diagonalization (BD) and MRT whereas for uplink
    three schemes: ZF, Minimum Mean Square Error (MMSE) and Maximum Ratio Combining (MRC).
    Why MRT is not implemented for Uplink?

    #15189
    Mariam Mussbah
    Keymaster

    Dear Farhan,

    The name maximum ratio transmission indicates that the multi-user MIMO processing takes place at the transmitter side, whereas the name maximum ratio combining indicates that the processing takes place at the receiver side. For multi-user MIMO, the processing takes place at the BS; therefore, MRT is used in the downlink and MRC in the uplink.

    Best,
    Mariam

    #15190
    Farhan
    Participant

    Thanks Mariam for the clarification, moreover for massive MIMO scenario, if we are using multiuserMode.Downlink={‘ZF-MUMIMO’} and the schedule for the superimposed users below, while playin it says the schedule in the scenario file is ignored and all users assigned to the base station are scheduled to transmit/receive on all available subcarrriers. Is it reasonable to say that we are still using NOMA (3GPP MUST technique) with these setting? Or when using ZF or MRT we are using OMA?

    scStr.schedule.fixedScheduleDL{1} = [‘UE1:72,UE2:UE1,UE3:UE1,UE4:UE1’];
    scStr.schedule.fixedScheduleDL{2} = [‘UE5:72,UE6:UE5,UE7:UE5,UE8:UE5’];
    scStr.schedule.fixedScheduleUL{1} = [‘UE1:72,UE2:UE1,UE3:UE1,UE4:UE1’];
    scStr.schedule.fixedScheduleUL{2} = [‘UE5:72,UE6:UE5,UE7:UE5,UE8:UE5’];

    #15191
    Mariam Mussbah
    Keymaster

    Dear Farhan,

    No, MUST is only applied when the multi-user mode is set to MUST.

    Best,
    Mariam

    #15240
    Farhan
    Participant

    Hi Mariam,

    Thanks, Just wanted to ask When we Run massiveMIMO scenario, in BER Graph, What does the Coded and Uncoded Represent?

    Regards,
    Farhan

    #15262
    Mariam Mussbah
    Keymaster

    Dear Farhan,

    It represents the coded and uncoded bit error ratio.

    Best,
    Mariam

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