fast fading is described by the power control headroom. This can be calculated power control headroom = (Eb/Io)average received without fast PC - (Eb/Io)average received with fast PC Thus, the required signal power can be calculated as: Required signal power = receiver noise power + required Ec/10 - interference margin + MDC gain Body loss in usually used only for speech services and can be safely assumed to be zero for data services. Based on the inputs, an example of a link budget in 3G is shown in Figure 2.10 (where LCD is long constrained delay data and UDD is unconstrained delay data). Link Budgets: Voice Data rate (kbps): Load: Uplink Downlink Uplink Downlink Uplink Downlink Uplink Downlink Uplink Downlink RECEIVING END Node B Node B Node B Node B Node B Thermal Noise Density dBm/Hz BTS Receiver Noise Figure BTS Receiver Noise Density dBm/Hz -171.00 -166.00 -171.00 -166.00 -171.00 -166.00 -171.00 -166.00 -171.00 -166.00 BTS Noise Power [NoW] -105.16 -100.16 -105.16 -100.16 -105.16 -100.16 -105.16 -100.16 -105.16 -100.16 Reguired Eb/No -0.50 -0.50 -1.00 -1.50 Soft handover MDC gain Processing gain 24.98 24.98 17.78 17.78 17.78 17.78 14.26 14.26 10.00 10.00 Interference margin (NR) Required BTS Ec/Io [q] -20.47 -16.97 -15.27 -10.77 -15.27 -10.77 -12.25 -7.75 -8.49 -3.99 Required Signal Power [S] -125.63 -117.13 -120.43 -110.93 -120.43 -110.93 -117.41 -107.91 -113.65 -104.15 Cable loss Body loss Antenna gain RX 18.00 18.00 18.00 18.00 18.00 Soft handover gain Power control headroom Sensitivity -139.63 -114.13 -134.43 -112.93 -134.43 -112.93 -131.41 -109.91 -127.65 -106.15 TRANSMITTING END Node B Node B Node B Node B Node B Power per connection 21.00 26.50 21.00 27.50 21.00 27.50 26.00 32.50 26.00 32.50 Maximum Power per connection 21.00 40.00 21.00 40.00 21.00 40.00 26.00 40.00 26.00 40.00 Cable loss Body loss Antenna gain TX 18.00 18.00 18.00 18.00 18.00 Peak EIRP 16.00 41.50 21.00 42.50 21.00 42.50 26.00 47.50 26.00 47.50 Maximum Isotropic path loss 155.63 169.13 155.43 167.93 155.43 167.93 157.41 164.91 153