03843nam a2200469 4500 20260817173339.0 180698 th eng .b11489303 AIT Thesis no.TC-95-9 Sivagurunathan, Balasubramaniam Comparative performance study of LEOS and terrestrial mobile systems with reference to the DS-SSMA technique Bangkok : Asian Institute of Technology, 1995 94 leaves : ill. Thesis ; no. TC-95-9 Thesis (M.Eng.) - Asian Institute of Technology, 1995 A thesis submitted in partial fulfillment of the requirement for the degree of Master of Engineering. The integration between terrestrial cellular networks and land mobile satellite based cellular networks is a very promising issue since it permits to immediately provide areas lacking in terrestrial facilities with the radio services offered by the satellite based cellular networks. This study analyze the performances of terrestrial mobile system (TMS) and land mobile satellite system (LMSS), which use direct-sequence spread-spectrum multiple access (DS-SSMA) technique with BPSK modulation, for integrating the two systems. TMS and LMSS have to be integrated in rural areas in order to provide nationwide/global coverage by the cellular networks to ensure cost effective services. In order to analyze their performance and hence integration, baseband equivalent of the asynchronous DS-SSMA system is modeled focusing on simulation aspects. Using this model, the performance of TMS and LMSS are evaluated by simulation-based approach. Since TMS can offer less expensive services compared to LMSS, the capacity (i.e., number of users) of extreme end cell in the cell cluster of TMS is maximized against BER using the technique called adaptive cell sizing. By considering a user (worst case user) moving away across the extreme end cell boundary of TMS, the BER performance of TMS for this user is obtained in order to analyze the integration. For the two systems, the channel is statistically modeled by lognormal shadowing with Rician fading. The results show that the application of adaptive cell sizing technique increases the extreme end cell capacity of TMS. Artificial satellites in telecommunication Spread spectrum communications Ahmed, Kazi Mohiuddin, Chairperson Erke, Tapio J., Examination Committee MakeHiinen, K., Examination committee Tuchinda, C., Examination committee Finnish International Development Agency (FINNIDA) Finland., Scholarship donor Asian Institute of Technology. Thesis ; no. TC-95-9 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B15300 .b11489303 mnait s 240717 0 960603 m a s 0 mnait mnait mnarc mnarc 22 40 20 Barcode : 30050120809099 CREATED : 2014-05-14 RECORD # : i12799270 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050160046040 CREATED : 2016-02-03 RECORD # : i12887560 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050211018683 CREATED : 2021-04-30 RECORD # : i13341583 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050211018675 CREATED : 2022-03-17 RECORD # : i13373808 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 19655 19655 0 0 0 0 MAIN MAIN mnarc 2026-08-17 50.00 0 AIT Thesis no.TC-95-9 30050120809099 2026-08-17 17:33:39 3 2026-08-17 22 0 0 0 0 MAIN MAIN mnarc 2026-08-17 0 AIT Thesis no.TC-95-9 30050160046040 2026-08-17 17:33:39 2026-08-17 40 0 0 0 0 MAIN MAIN mnait 2026-08-17 50.00 0 AIT Thesis no.TC-95-9 30050211018683 2026-08-17 17:33:39 1 2026-08-17 20 0 0 0 0 MAIN MAIN mnait 2026-08-17 50.00 0 AIT Thesis no.TC-95-9 30050211018675 2026-08-17 17:33:39 2 2026-08-17 20