03949nas|a2200457 i 4500 20260817172143.0 030919s2002 th uzm rtt 00| a1eng d .b11899360 AIT RSPR no.TC-02-06 Pinuttinee Sukpisal Capacity enhancement in CDMA cellular systems with different structures of adaptive antenna array Bangkok : Asian Institute of Technology, 2002 46 leaves Research studies project report ; no. TC-02-06 Research Studies Project Report (M.Eng.) - Asian Institute of Technology, 2002 A research study submitted in paiiial fulfillment of the requirements for the degree of Master of Engineering, School of Advanced Technologies As the demand for wireless cellular increases, it is necessary to develop cellular systems to handle the increased number of users. CDMA is one technique that enhances the efficiency of limited radio spectrum use since it is strictly interference limited. System capacity can be improved by increasing the number of base stations while decreasing the size of cell simultaneously. However, it is an expensive solution in te1ms of equipment required. Thus, one method for mitigating this problem is the use of adaptive antenna array at the base station. The goal of this research is to enhance the capacity in CDMA cellular system which is a single cell and an open area by using reference signal as the beamforming technique for adaptive antenna airny. In addition, the cellular system is assumed to be in perfect power control. This research focuses on the structures of adaptive antenna anay as a function of antenna array geometry (e.g. uniform linear array, uniform rectangular atTay, and uniform circular array), antenna element number, and antenna element spacing. In addition, the improvement performance is evaluated by comparison with omni-directional antenna, which the key parameter to indicate is Carrier to Interference Ratio (CIR). From the results, it has been observed that the more antenna element number and the more antenna element spacing give the higher number of users per cell at the threshold CIR. Moreover, at the same antenna element number, antenna element spacing, and a threshold CIR, the obtained results of UCA provides the highest capacity improvement whereas the obtained results of ULA provides the lowest capacity improvement with respect to omni-directional antenna. Code division multiple access Adaptive antennas Cellular telephone systems Ahmed, Kazi Mohiuddin, Chairperson Fernando, W.A.C., Examination Committee Erke, Tapio J., Examination Committee Asian Institute of Technology. Research studies project report ; no. TC-02-06 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B08003 .b11899360 mnait u 240503 0 030919 m a u 0 mnait mnait mnarc mnarc 22 40 20 Barcode : 30050120552327 CREATED : 2012-03-12 RECORD # : i12719900 LPATRON : 1026144 LCHKIN : 2016-08-31 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 1 TOT RENEW : 1 Barcode : 30050120349328 CREATED : 2016-08-06 RECORD # : i13026422 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050211032957 CREATED : 2021-04-30 RECORD # : i13341352 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050211023451 CREATED : 2022-07-02 RECORD # : i13362525 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 15018 15018 0 0 0 0 MAIN MAIN mnarc 2026-08-17 0 AIT RSPR no.TC-02-06 30050120552327 2026-08-17 17:21:43 3 2026-08-17 22 0 0 0 0 MAIN MAIN mnarc 2026-08-17 0 AIT RSPR no.TC-02-06 30050120349328 2026-08-17 17:21:43 2026-08-17 40 0 0 0 0 MAIN MAIN mnait 2026-08-17 50.00 0 AIT RSPR no.TC-02-06 30050211032957 2026-08-17 17:21:43 1 2026-08-17 20 0 0 0 0 MAIN MAIN mnait 2026-08-17 50.00 0 AIT RSPR no.TC-02-06 30050211023451 2026-08-17 17:21:43 2 2026-08-17 20