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radio optimization

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  • #42151 Reply
    monem
    Guest

    Hi all.
    we meet some problem in our network in (cell border modefication). so made more mechanical tilt instead of antenna highet reduction & inter it in our planner.
    so i ask is it sufficent to work just by M tilt instead of Ant highet, & no problem for propagation breakpoint (max highet is 50 m).
    any body have more info on it.???
    Regards

    #42152 Reply
    Chefo
    Guest

    Hi Monem,

    It is very important to make the cell borders as sharp as possible. Remember-the border is sharper when the beam is falling at steeper angle, so the higher the cell antenna-the better the borders. You should look for the -3dB of the antenna pattern (vertical) and this should be your border.
    Good luck!

    #42153 Reply
    monem
    Guest

    Thanks chefo.
    OK.
    let us say we have 40m antenna, & coverage area with 1.4 km radius.
    if we need to optimize the radious to 1km, which way is better ( to reduce the antenna highet OR to make more down tilt) assume that there is no obstacle for fersnel zone even we made a high down tilt (open area).
    Regards.

    #42154 Reply
    monem
    Guest

    Thanks chefo.
    OK.
    let us say we have 40m antenna, & coverage area with 1.4 km radius.
    if we need to optimize the radious to 1km, which way is better ( to reduce the antenna highet OR to make more down tilt) assume that there is no obstacle for fersnel zone even we made a high down tilt (open area).
    Regards.

    #42155 Reply
    jood
    Guest

    Mechanical downtilt angle depends at least on 2 factors.
    1-Geometrical factor which is = arctan(h(bts)-h(MS))/d .
    h(bts): bts antenna highet.
    h(MS): mobile antenna highet.
    d : distance to cell border.
    2-Antenna beamwidth factor(vertical BW upper -3dB in V pattern)
    so,two great impact on D tilt angle(V beam width & Ant geometric which depends mainly on Ant highet.
    thus the antenna highet has great effect on tilt angle .BUT we must must define it at initial (nominal plan),& any optimization after that is better with tilt.(unless seldom emergency condition).
    regards.

    #42156 Reply
    Buddha
    Guest

    Hi,

    Better study the book Mobile Communication by CY Lee

    #42157 Reply
    patrick
    Guest

    I think that more down tilt is better to make indoor cover on your local area.

    #42158 Reply
    more
    Guest

    hi all
    I need to know about the relation between 3G CDMA band width, and the resulted coherence bandwidth of RF signal. and How the CDMA BW be narrow BW or wide BW according to the coherence BW.

    #42159 Reply
    jood
    Guest

    Hi more:
    coherence BW is approximately inverse of delay spread. thus coherence BW is wide when delay spread is small (indoor environment). So when coherence BW is >>>>more big than CDMA BW.the CDMA is assumed to be narrow band (espetialy indoor).

    #42160 Reply
    monem
    Guest

    hi all
    How can i perform a consentric cell in network.& how can i use the forbiden interfered freq in inner zone(plan different reuse factor) & is it antenna for any zone =>> increase no of antennas.
    please i need info & documentation……any body have???
    TH in AD

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