Maximizing the Allowable Coverage Area of a Broadband Wireless Communication System that Utilizes an Occupied Frequency Band Candidate: Dragan Trajkov Mentor: Dr. Jim Roberts
Presentation Outline Motivation Explanation of the general problem and the approach taken in presenting the results Theoretical Formulas Used Interference bound Propagation model Antenna gains and patterns Transmit power level of the user antenna
Presentation Outline Cont. Algorithm For Computing the Forbidden Zone Results Forbidden Area Ratio Adjusting the azimuthal pointing of the AP Antenna Adjusting the ground direction of the AP antenna
Presentation Outline Cont. Effects of adjusting the AP antenna height Effects of adjusting the AP antenna distance Effects of using power control Effects of increasing the gain of the user antenna Interference from the AP antenna
Presentation Outline Cont. Summary Conclusions Future Work Questions
Motivation
Interference Bound P N received (10 M /10 1) M is the Margin N is the noise power
Propagation Model
Propagation Model P received P g g transmitter IS IWS IWS IS 4 (( h h ) d r t g ) m
Antenna Gains and Patterns
Antenna Gains and Patterns ab g ( ) (1 (AP antenna) cos ) a sin( sin cos ) a sin cos b sin( sin sin ) b sin sin
Antenna Gains and Patterns (IS antenna)
Antenna Gains and Patterns Antenna Gains and Patterns (IWS antenna) (IWS antenna) 1 1 1 1 1 sin ) sin ( sin ) sin ( ) cos (1 ) ( a a a J a a J a a g
Transmit Level of the User Antenna P IS antenna ( dbm) P received ( dbm) G IS ( dbi) G AP ( dbi) PathLoss( db) AddiLoss ( db) PathLoss( db) 40log d 0log h transmitte 0log h r receiver P IS antenna ( dbm) 81 G ( dbi) IS 18 106 0 9
Algorithm for Computing the Algorithm for Computing the Forbidden Zone Forbidden Zone ) ) (( 4 ) ( ) ( d h h g g g P P antenna IWS antenna IS m IS IWS IS IWS IWS IS IWS IS IWS IS antenna IS received ) ( ) ( ) ( 3 1 a IS AP antenna AP antenna IWS antenna IS IS IWS a IS AP antenna AP antenna IWS antenna IS IWS IS a IS AP antenna AP antenna IWS antenna IS IWS IS d h h h d f d h h h d f d h h h d f
Algorithm for Computing the Forbidden zone
Algorithm for Computing the Forbidden Zone M PIS antenna F ( d ) 10 G( d ) N (10 4 (( his antenna hiws antenna ) d ) 1) G(d) non-interference area G(d)<0 Interference Area G(d)>0 last zero at d=d 1 d [m]
Algorithm for Computing the Forbidden Zone G(d) Last zero in the interval [0 d max ] d max d [m] Interval of interest
Azimuthal Pointing Adjustment y-axis direction Distance form the IWS antenna in the x- directiond[meters]
Azimuthal Pointing Adjustment y-axis direction Distance form the IWS antenna in the x- directiond[meters]
10.00% 8.00% Forbidden Area Ratio FAR [%] 6.00% 4.00%.00% 0.00% 0 4.5 6.5 8.5 10.5 1.5 14.5 16.5 18.5 0.5 Absolute Value of the Azimuth Angle of the AP antenna TazimuthAP [º].5 4.5 6.5 8.5 y-axis directio n Distance form the IWS antenna in the x- directiond[meters]
Adjusting the Ground Direction of the AP Antenna Forbidden Area Ratio FAR [%] 35 30 5 0 15 10 5 0 0 15 30 45 60 75 90 105 10 135 150 165 180 Ground direction of the AP antenna AP [] 3500m 500m 1500m 500m
Adjusting the Ground Direction of the AP Antenna Forbidden Area Ratio FAR[%] 16 14 1 10 8 6 4 0 0 15 30 45 60 75 90 105 10 135 150 165 180 da=1500m da=500m da=3500m m Ground direction of the AP antenna AP []
Effects of the AP Antenna Height Forbidden Area Ratio FAR [%] 10 9 8 7 6 5 4 3 1 0 30m 40m 50m 60m 70m 0 deg 50 deg 90 deg 140 deg 180 deg AP antenna height h APantenna [m]
Coverage Dependence on the AP Antenna Distance 35 30 Forbidden Area Ratio [%] 5 0 15 10 180 90 0 5 0 500 1000 1500 000 500 3000 3500 4000 4500 Distance between AP antenna and the IWS antenna da [m]
y-axis direction d[meters] Distance form the IWS antenna in the x- directiond[meters] y-axis direction d[meters] Distance form the IWS antenna in the x- directiond[meters]
Effects of Power Control FAR [%] 1.6 1.4 1. 1 0.8 0.6 0.4 0. 0 500 1000 1500 000 500 3000 3500 4000 4500 Distance between IWS and AP antennas d a [m] AP=0 / no pc AP=0 / pc FAR [%] 35 30 5 0 15 10 5 0 500 1000 1500 000 500 3000 3500 4000 4500 Distance between IWS and AP antennas da [m] AP=180/ no pc AP=180/ pc
Effects of Power Control 35 30 FAR [%] 5 0 15 10 5 AP=180/ no pc AP=180/ pc 0 500 1000 1500 000 500 3000 3500 4000 4500 Distance between IWS and AP antennas d a [m] 140 10 improvment [no dim] 100 80 60 40 0 0 500 1000 1500 000 500 3000 3500 4000 4500 AP =0 A P =90 AP=180 Distance between IWS and AP antennas d a [m]
Effects of Power Control FAR [%] 9 8 7 6 5 4 3 1 0 500 1000 1500 000 500 3000 3500 4000 4500 Distance between IWS and AP antenna d a [m] h AP =30 h AP =70
Effects of the Antenna Gain Increase FAR [%] 10 9 8 7 6 5 4 3 1 0 0 15 30 45 60 75 90 105 10 135 150 165 180 18dbi 0dbi dbi 4dbi Ground dirction of the AP antenna AP []
Effects of the Antenna Gain Increase 14 1 FAR [%] 10 8 6 4 AP =0 AP=90 AP =180 0 16 18 0 4 6 Maximum gain of the IS antenna Gain [dbi]
AP =0 AP =90 FAR [%] 1.6 1.4 1. 1 0.8 0.6 0.4 0. 0 500 1000 1500 000 500 3000 3500 4000 4500 Distance between IWS and AP antennas d a [m] 18 dbi 0 dbi 4 dbi FAR [%] 14 1 10 8 6 4 0 500 1000 1500 000 500 3000 3500 4000 4500 Distance between IWS and AP antennas da [m] 18 dbi 0 dbi 4 dbi AP = 180 FAR [%] 35 30 5 0 15 10 5 0 500 1000 1500 000 500 3000 3500 4000 4500 18 dbi 0 dbi 4 dbi Improvement [no dim] 6 5 4 3 1 0 500 1000 1500 000 500 3000 3500 4000 4500 AP=0 AP=90 AP=180 Distance between IWS and AP antennas d a [m] Distance between IWS and AP antennas da [m]
Effects of the Antenna Gain Increase and Power Control AP =180 FAR [%] 35 30 5 0 15 10 5 0 500 1000 1500 000 500 3000 3500 4000 4500 power control 4 dbi 18 dbi Distance between the IWS and AP antennas d a [m]
AP Antenna Interference
Summary Maximizing the area coverage Select a direction for the AP antenna Maximize the distance between the AP and the IWS antenna Adjust the AP antenna height Determine whether power control is necessary Repeat the steps if necessary Determine which step applies for specific implementation
Future Work A case with two or more antenna in the sector Using different antenna patterns Use different frequency Confirm the finding with measurements from real-life case scenario
Questions