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Interference
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13.4 Coordination When a new satellite network is in the planning stage, certain calculations have to be made to ensure that the interference levels will remain within acceptable limits. These calculations include determining the interference that will be caused by the new system and interference it will receive from other satellite networks. In Sec. 13.2, procedures were outlined showing how interference may be calculated by taking into account modulation parameters and carrier frequencies of wanted and interfering systems. These calculations are very complex, and the CCIR uses a simplified method to determine whether coordination is necessary. As mentioned previously, where the potential for interference exists, the telecommunication administrations are required to coordinate the steps to be taken to reduce interference, a process referred to as coordination. To determine whether or not coordination is necessary, the interference level is calculated assuming maximum spectrum density levels of the interfering signals and converted to an equivalent increase in noise temperature. The method is specified in detail in CCIR Report 454 3 (1982) for a number of possible situations. To illustrate the method, one specific situation where the existing and proposed systems operate on the same uplink and downlink frequencies, will be explained here. Figure 13.8a shows the two networks, R and Rr. The method will be described for network Rr interfering with the operation of R. Satellite Sr can interfere with the earth-station E, this being a B1 mode of interference, and earth-station Er can interfere with the satellite S, this being a B2 mode. Note that the networks need not be physically adjacent to one another.
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13.4.1 Interference levels
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Consider first the interference B1. This is illustrated in Fig. 13.8b. Let US represent the maximum power density transmitted from satellite S . The units for US are W/Hz, or joules (J), and this quantity is explained in more detail shortly. Let the transmit gain of satellite S in the direction of earth-station E be G , and let GE be the receiving gain of earthS station E in the direction of satellite S . The interfering spectral power density received by the earth station is therefore [I1] [US] [G ] S [GE] [LD] (13.10)
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where LD is the propagation loss for the downlink. The gain and loss factors are power ratios, and the brackets denote the corresponding decibel values as before. The increase in equivalent noise temperature
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(a) Interference modes B1 and B2 from network R into network R. (b) For the B1 mode the interfering power in dBW/Hz is [I1] [US] [G S] [GE] [LD]. (c) For the B2 mode the interfering power in dBW/Hz is [I2] [UE] [G ] [GS] [LU]. E
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at the earth-station receiver input can then be defined using Eq. (12.15) as [ TE] [I1] [I1] [k] 228.6 (13.11)
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Here, k is Boltzmann s constant and [k] 228.6 dBJ/K. A similar argument can be applied to the uplink interference B2, as illustrated in Fig. 13.8c, giving [I2] [UE] [G ] E [GS] [LU] (13.12)
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The corresponding increase in the equivalent noise temperature at the satellite receiver input is then [ TS] [I2] 228.6 (13.13)
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Interference
Figure 13.9 (a) Defining the transmission gain in Sec. 13.4.2. (b) Use of transmission gain to refer satellite noise temperature to an earth station.
Here, UE is the maximum power spectral density transmitted by earth station E , G E is the transmit gain of E in the direction of S, GS is the receive gain of S in the direction of E , and LU is the uplink propagation loss.
13.4.2 Transmission gain
The effect of the equivalent temperature rise TS must be transferred to the earth-station E, and this is done using the transmission gain for system R, which is calculated for the situation shown in Fig. 13.9. Figure 13.9a shows the satellite circuit in block schematic form. UE represents the maximum power spectral density transmitted by earth-station E, and GTE represents the transmit gain of E in direction S. GRS represents the receive gain of S in direction E. The received power spectral density at satellite S is therefore [URS] [UE] [GTE] [GRS] [LU] (13.14)
In a similar way, with satellite S transmitting and earth-station E receiving, the received power spectral density at earth-station E is [URE] [US] [GTS] [GRE] [LD] (13.15)
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