Generic selectors
Exact matches only
Search in title
Search in content
Search in posts
Search in pages

Why Rxlev in -dBm

Viewing 16 post (of 16 total)
  • Author
    Posts
  • #59371 Reply
    Fahad
    Guest

    As to the GSM1800 system::
    PL(dB) =32.45+20lg(1800)+20lgd(km)= 97.5+20lgd(km)
    D 1m 10m 20m 25m 30m 35m 40m
    Ls 37 57 63 65 67 68 69

    For In-building signal, GrenTech experienced Formula is as follow:
    L=LD+10LgD (m) + FAF

    Here, the FAF means the loss led by the internal obstruction; the experienced value is as follow
    FAF 900MHz 1800MHz
    Wood Board 5~6Db 6~8dB
    Glass 7~8dB 8~10dB
    Brick Wall 10~12dB 14~16dB
    Concrete Wall 15-20dB 20-25dB
    Elevators 30-40dB 35-40dB

    Supposed
    The output power of the antennas for GSM1800 P0=10dBm
    The gain of omni antenna G0=3dBi, the FAF of the wall is about 20dB,
    L (20m) =63+10lgD (m) +FAF

    =63+13+20=96
    So the RSSI=P0+G0-L=10+3-96=-83 (dBm)

Viewing 16 post (of 16 total)
Reply To: Reply #59359 in Why Rxlev in -dBm
Your information:




<a href="" title="" rel="" target=""> <blockquote cite=""> <code> <pre class=""> <em> <strong> <del datetime="" cite=""> <ins datetime="" cite=""> <ul> <ol start=""> <li> <img src="" border="" alt="" height="" width="">