000 03555nas|a2200433 a 4500
005 20260817171156.0
008 060925s2006 th uu|m rtt 0| a1eng d
035 _a.b11993923
099 9 _aAIT Thesis no.ICT-06-11
100 1 _aHossain, Md. Anwar
245 1 0 _aBeamforming using tapped delay line filters for broadband CDMA systems
260 _aPathum Thani, Thailand :
_bAsian Institute of Technology,
_c2006
300 _a51 leaves :
_bill.
490 1 _aThesis ;
_vno. ICT-06-11
500 _aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology
502 _aThesis (M.Eng.) - Asian Institute of Technology, 2006
520 _aNext 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.
650 0 _aCode division multiple access
650 0 _aAntenna arrays
700 0 _aPoompat Saengudomlert,
_eChairperson
700 1 _aRajatheva, R.M.A.P,
_eExamination Committee
700 1 _aAhmed, Kazi Mohiuddin,
_eExamination Committee
710 2 _aGovernment of Finland,
_eScholarship donor
710 2 _aAsian Institute of Technology Fellowship,
_eScholarship donor
810 2 _aAsian Institute of Technology.
_tThesis ;
_vno. ICT-06-11
856 _3Full-Text
_uhttp://203.159.5.9/ait-thesis/detail.php?q=B10622
907 _a.b11993923
_bmnait
_cu
902 _a240401
998 _b0
_c060925
_dm
_ea
_fu
_g0
945 _lmnait
945 _lmnait
945 _lmnarc
942 _c20
942 _c40
909 _aBarcode : 30050120702880
_bCREATED : 2006-09-25
_cRECORD # : i12497150
_dLPATRON : 1024601
_eLCHKIN : 2013-10-29
_f# RENEWALS : 0
_g# OVERDUE : 0
_hIUSE3 : 0
_iTOT CHKOUT : 2
_jTOT RENEW : 0
909 _aBarcode : 30050120702872
_bCREATED : 2006-09-25
_cRECORD # : i12497162
_dLPATRON : 0
_eLCHKIN : -
_f# RENEWALS : 0
_g# OVERDUE : 0
_hIUSE3 : 0
_iTOT CHKOUT : 0
_jTOT RENEW : 0
909 _aBarcode : 30050160097316
_bCREATED : 2016-03-05
_cRECORD # : i12968262
_dLPATRON : 0
_eLCHKIN : -
_f# RENEWALS : 0
_g# OVERDUE : 0
_hIUSE3 : 0
_iTOT CHKOUT : 0
_jTOT RENEW : 0
999 _c11221
_d11221