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  • 5G BR PRB CP and OFDM NFFT length

    Number PRB

    Number prb is decided by different bandwidth and SCS.

    Aggregate

     Aggregate relate bandwidth, no matter SCS.

    ü  bandwidth[60M 100]

          aggregate is 2, 2^2 = 4 means that 4 AxC corresponding to one ant.

    ü  bandwidth[30M 50M]

     aggregate is 1, 2^1 = 2 means that 2 AxC corresponding to one ant.

    ü  bandwidth20M

          aggregate is 0, 2^0 = 1 means that 1 AxC corresponding to one ant.

    FFT size

      FFT size is decided by bandwidth and SCS. Sample rate= FFT_size * SCS.

      FFT size @(bandwidth,SCS)show as below:

    U=0 à SCS=15k

    U=1 à SCS=30k

    U=2 à SCS=60k

    One thing need note is that for 30M, 30k, FFT size= 2048, not 1536.

    Another FFT size and cp length table show as below:

    cp length

    Tc = Basic time unit for NR=1/(2048*15000)

    Tc = Basic time unit for NR= 1/(FFT size*SCS)

    K= The ratio between Ts and Tc

    For example NR(100M,30k):

    K=(4096*30k)/(2048*15k)=4

    For example NR(100M,30k)

    First symbol cp length = 144*4*2^(-1) + 16*4 = 288+64 = 352

    scond symbol cp length = 144*4*2^(-1) = 288

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  • 原文地址:https://www.cnblogs.com/yanghonker/p/13390767.html
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