前言:

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【Optimization Hassle – Q & A [Interviews]】 What is beamforming in 5G NR

Beamforming 仿真工具数学原理:

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目录:

  1. what is beamforming in 5G
  2. what is factors that effect beamforming performance
  3. SRS & UCI
  4. what is 3D or FD beamforming
  5. what are types of beamforming” />

    A radar antenna focuses transmitted energy in a narrow(狭窄), conical-shaped beam(圆锥形的波束) (see Figure 1). The angular width of the radar beam is defined as that region of transmitted energy that is bounded by one-half (-3 dB) the maximum power. Around 80% of the energy is contained within the main beam(主波束), with the sidelobes(旁瓣)generally being more than 1000 times less intense in a high quality antenna (unlike in the p-theta graph)


    二 what is factors that effect beamforming performance

    N = number of elements

    Ge = element gain

    Gt = antenna gain

    Pt = total transmitter power

    Pe = Power of per element

    Tn = noise temperature


    三 SRS & UCI

    NR上行物理信号包括探测参考信号(Sounding Reference Signal,SRS)

    上行控制信息(Uplink Control information,UCI),用于向基站报告UE的状态,如HARQ接收的状态、信道状态信息等。


    四 what is 3D or FD beamforming

    Answer:

    —————–

    3D beamforming refers to use of mMIMO for steering beams both in the horizontal

    (Azimuth 方位角) dimention and vertical垂直(elevation 高度) dimentions

    if wehave a contol in beams in both vertical & horizental domain,

    so we have 3D or Full-mMiMo beamforming


    五 what are types of beamforming” />


    六 what is transmission mode(TM) in beamforming?

    Answer:

    ——–

    when enabling beamforming in mMIMO ,we have switch to three types of transmission

    mode TM and there are:

    TM7:

    Use single-stream beamforming(one code-word) Rank as diversity mode without spatial

    multiplexing

    use antenna port number-S

    TM8:

    Use dual-stream beamforming(two-code-wod)rankd2 as spatial-multiplexing MIMO.

    use antenna port 7&8

    TM9:

    use 8 streams beamforming as 8T8R MIMO.

    use antenna port 7,8,9,10,11,12,13,14

    Beamforming