03555nas|a2200433 a 4500 20260817171156.0 060925s2006 th uu|m rtt 0| a1eng d .b11993923 AIT Thesis no.ICT-06-11 Hossain, Md. Anwar Beamforming using tapped delay line filters for broadband CDMA systems Pathum Thani, Thailand : Asian Institute of Technology, 2006 51 leaves : ill. Thesis ; no. ICT-06-11 A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology Thesis (M.Eng.) - Asian Institute of Technology, 2006 Next generation wireless code division multiple access (CDMA) systems are expected to support transmission rates beyond those currently achieved by second and third generation systems. Antenna arrays are known to improve the transmission performance of CDMA systems. For broadband CDMA networks, the optimal signal processing for antenna arrays needs to be frequency selective. This thesis investigates the performance of uncoded uplink transmissions in broadband CDMA systems with tapped delay line (TDL) antenna arrays. The weights of TDL are derived for broadband CDMA systems. Through simulations, demonstration has been given how TDL antenna arrays can help reduce multiaccess interference (MAI), allow the use of spreading codes with higher correlation, and increase the number of supportable users. Using the two-ray channel model and assuming that users are located at the angles uniformly distributed around the base station, the number of antennas and tap delays required to increase the number of supportable users from 15 in the baseline case with small Kasami spreading codes and the uncoded bit error rate (BER) of 10-3 to 30, 60, and 120 users with large Kasami spreading codes respectively are identified. Two antennas and four taps each can support 30 users with uncoded BER of 10-3 at 20 dB SNR. Three antennas and six taps each can support 60 users with BER less than 10-3 at 20 dB SNR. Finally, eight antennas and sixteen taps each can support 120 users with BFR less than l0-3 at 20 dB SNR. Code division multiple access Antenna arrays Poompat Saengudomlert, Chairperson Rajatheva, R.M.A.P, Examination Committee Ahmed, Kazi Mohiuddin, Examination Committee Government of Finland, Scholarship donor Asian Institute of Technology Fellowship, Scholarship donor Asian Institute of Technology. Thesis ; no. ICT-06-11 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B10622 .b11993923 mnait u 240401 0 060925 m a u 0 mnait mnait mnarc 20 40 Barcode : 30050120702880 CREATED : 2006-09-25 RECORD # : i12497150 LPATRON : 1024601 LCHKIN : 2013-10-29 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 2 TOT RENEW : 0 Barcode : 30050120702872 CREATED : 2006-09-25 RECORD # : i12497162 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050160097316 CREATED : 2016-03-05 RECORD # : i12968262 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 11221 11221 0 0 0 0 MAIN MAIN mnait 2026-08-17 50.00 0 AIT Thesis no.ICT-06-11 30050120702880 2026-08-17 17:11:56 1 2026-08-17 20 0 0 0 0 MAIN MAIN mnait 2026-08-17 50.00 0 AIT Thesis no.ICT-06-11 30050120702872 2026-08-17 17:11:56 2 2026-08-17 20 0 0 0 0 MAIN MAIN mnarc 2026-08-17 0 AIT Thesis no.ICT-06-11 30050160097316 2026-08-17 17:11:56 1 2026-08-17 40