Well as far as the spectrum results says.It seems that the environment has high noise or there may be some other vendors too who are using the 5GHz band.For noisy environment there is nothing much which you can perform. But But.......We should focus on our primary goal (as a Network Expert) of "network performance". How we can achieve it even though there is noise on the floor.
There are few but very very important stuff you can perform to avoid noise even if it is there.So the steps are :-
1.) First of all go to https://support.cambiumnetworks.com/files/epmp/#r3 this link and download the Capacity planner tool..Fill the details in this macro sheet as per your device details and configuration.Below are the guidlines to help you on this :-
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Region :As per device configuration.
Frequency band :As per device configuration.
Fade Margin: Not really required.
Channel Bandwidth: Fill it as per device configuration.
AP type:Fill it as per device hardware type.
AP antenna system: Fill it as per device hardware type.In your case 90degree.
3rd party connectorized SMs in sector?: Yes or No as per your deployment.
AP 3rd party antenna gain: If any
AP 3rd party antenna cable loss: If any
3rd party connectorized SMs in sector? : If any
3rd party conn. SM antenna gain: If any please mention.
3rd party conn. SM antenna cable loss : If any.
Environment : Line Of Sight or near Line Of Sight or Non Line Of Sight.
Range unit : As per device configuration.
Max range : As per device configuration.
Frame duration : As per device configuration.
Number of SMs/sector : As per deployment requirement.
Duty cycle : As per device configuration.
Max Combined AP Tx power (min MCS): As per device configuration.
Interference measured? Yes
SM antenna for measuring interference : Enter as per SM antenna type ?
Downlink interference level: AP side noise level on perticular band.
Uplink interference level: SM side noise level on perticular band.
% of SMs with uneven paths (single stream MCS): not really required.
SM antenna for displaying data: SM hardware type Integrated or Connectorized ?
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2.)So the catch here is if you enter all realistic information (as per current site environment conditions)on this tool you would be able to know about the details like :-
a.) LINK BUDGET FOR INTEGRATED ANTENNA
This contains AP/SM's Rx Power and MCS levels at each condition.
b.) SYSTEM GAIN
This will give you the AP/SM's complete system gain at each MCS level.
c.) COVERAGE AND CAPACITY.
This is last but not least and it is very very important. The complete coverage and throughput of your 90degree or 60degree or 45degree sector at each and every MCS level.
I would like to repeat and give a temporary but permanent fix for Noisy environment.
1.) Either you should use high transmitt power (Please do not exceed regulatory boundaries as per your region,Cambium do not emphasis this practice or neither suggests).Meaning use max Tx power on AP as per your regulatory standard.
2.)If still issue persists or you still see the performance issues: Then use reflector dishes or connectorized or Force110/Force180 High gain Subscriber Modules at customer site.
3.)Always keep an eye on MCS value.If device achieve higher MCS value like MCS15 or MCS14.This will give you max throughput.Rest you can do R&D in Capacity Planner to understand the catch.
NOTE: Always remember that the noise would always not be at AP side,It can be at SM side as well. So we should consider both values and enter them in Capacity planner as mentioned above in the steps.
I hope this solution will help you understanding the "Noise" related issues for future as well.