(51) International Patent Classification: H04B 7/204 (2006.01) H04B 7/185 (2006.01) (21) International Application Number: (22) International Filing Date: (25) Filing Language: (26) Publication Language: (30) Priority Data: LU 100879 25 July 2018 (25.07.2018) LU (71) Applicant: UNIVERSITE DU LUXEMBOURG [LU/LU]; 2, avenue de l’Universite, 4365 Esch-sur-Alzette (LU). (72) Inventors: ANDRENACCI, Stefano; 36, rue Wurth-Pa- quet, 2737 Luxembourg Luxembourg Luxembourg (LU). CHATZINOTAS, Symeon; 3 rue Jules Mersch, 2184 Lux‹ embourg (LU). (74) Agent: WAGNER, Jean-Paul; Corax IP 2, rue Wilson, 2732 Luxembourg (LU). (81) Designated States (unless otherwise indicated, for every kind of national protection available) : AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DJ, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IR, IS, JO, JP, KE, KG, KH, KN, KP, KR, KW, KZ, LA, LC, LK, LR, LS, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, (84) Designated States (unless otherwise indicated, for every kind of regional protection available) . ARIPO (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, UG, ZM, ZW), Eurasian (AM, AZ, BY, KG, KZ, RU, TJ, TM), European (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR), OAPI (BF, BJ, CF, CG, Cl, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG). Published: — with international search report (Art. 21(3)) SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW. PCT/EP20 19/0700 18 25 July 2019 (25.07.2019) English English (54) Title: RELIABLE CHANNEL STATE INFORMATION IN MULTI-BEAM SATELLITE COMMUNICATIONS (57) Abstract: The invention provides a method for determining the reliability of estimated channel state information for each car- rier/beam in a multi-beam satellite communication system, wherein the 5 signals are transmitted using aggressive frequency reuse among the carriers/beams. The proposed method allows to reduce the complexity of the receiver as compared to known systems, as the detection of interfering carriers is shifted towards the end of the workflow, when the signal of the reference carrier has already been frequency, phase, and time compensated. Fig. 1