TABLE 7 Study items for the 21 GHz band broadcasting-satellite services and the associated feeder-link systems Study items BSS systems with the mitigation technique of orresponding Recommendations Increase in e.i.r.p. Hierarchical transmission Broadcasting system assuming storage in receiver 1 Service availability – Objective of availability against the fading caused by precipitation – Objective of availability against the fading caused by precipitation – Definition of service availability for non-real time broadcasting 2 Attenuation caused by precipitation and other meteorological factors – Relation between attenuation and time – Fade dynamics (Frequency and duration of attenuation) – Fade dynamics (Frequency and duration of attenuation) P.618- P.1623 3 Downlink e.i.r.p. or pfd – Derived by the required service availability and attenuation – Derived by the required service availability and attenuation – Derived by the required service availability and attenuation 4 Channel coding – Modulation scheme, interleave, etc. – Modulation scheme, interleave, etc. – Modulation scheme, interleave, etc. BO.1408-1 BO.1516 5 Sharing criteria – Protection ratios, pfd mask,  T / T, C/I, EPM, I/N – Protection ratios, pfd mask,  T / T, C/I, EPM, I/N – Protection ratios, pfd mask,  T / T, C/I, EPM, I/N BO.792 BO.1293-2 6 Methodology for interference calculation – Including the satellite orbital spacing, satellite station keeping – Including the satellite orbital spacing, satellite station keeping – Including the satellite orbital spacing, satellite station keeping BO.1212
7 Frequencies for feeder link 8 Feeder-link e.i.r.p. – site diversity – power control – site diversity – power control – site diversity – power control 9 Receiving G/T – NF – NF – NF BO.790 10 Polarization – LP, CP, or not specified BO.791 11 Reference receive earth station antenna patterns – Diameter, gain, reference pattern – Diameter, gain, reference pattern – Diameter, gain, reference pattern BO.1213 12 Reference patterns for satellite transmitting antennas – Range of gain control, description in Appendix 4 – Gain, off-axis radiation pattern – Gain, off-axis radiation pattern BO.652-1 13 Reference patterns for satellite receiving antennas – – – 14 Reference transmit earth station antenna off-axis e.i.r.p. patterns – e.i.r.p., reference pattern – e.i.r.p., reference pattern – e.i.r.p., reference pattern BO.1295 15 Unwanted emission level – 16 Others
TABLE 14 Examples of 21 GHz band BSS parameters utilizing a locallyvariable e.i.r.p. system (The diameter of the boosted beam is 400 km and the information rate is about 40 Mbit/s) Link parameters Uplink C/(N + I) 24 dB Tx antenna diameter 4 m No. of feed horns 188 Receiving antenna Dia. = 45 cm, = 70%, NF = 1.5 dB Information bit rate About 40 Mbit/s Modulation QPSK1/2 TC8-PSK 16-QAM3/4 Required C/N 4.4 dB 7.5 dB 10.7 dB 17.0 dB Channel bandwidth (99%) 54.2 MHz 35.4 MHz 26.4 MHz 17.4 MHz Symbol rate 45.2 MBd 29.6 MBd 22 MBd 14.6 MBd Required pfd (dB(W/(m2 · MHz)))(1) Case 1 Service availability in a year by boosted beam 99.9% (Rain attenuation: dB total attenuation: dB) Antenna gain Boosted beam (–3 dB): 46.7 dBi Nationwide beam (min.): 38.0 dBi Total RF power (Fig. 27) e.i.r.p. nationwide e.i.r.p. boosted beam(–3 dB) Peak pfd (dB(W/(m2 · MHz))) Boosted beam pfd (dB(W/(m2 · MHz))) Nationwide beam pfd (dB(W/(m2 · MHz))) Case 2 Service availability in a year by boosted beam 99.7% (Rain attenuation: dB attenuation: dB)