SDMA scheme for the rural wireless local loop with adaptive antenna arrays | |
| Author | Pornsawan Nasok |
| Call Number | AIT Thesis no.TC-02-04 |
| Subject(s) | Wireless communication systems Adaptive antennas |
| Note | A thesis submitted in partial fulfillment of requirements for the degree of Master of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. TC-02-04 |
| Abstract | In order to provide the telephone service for low density population areas, such as rural area, especially in the developing countries, Wireless local loop (WLL) is a solution of this problem due to its small investment, low maintenance and operating cost. And its break-event point can be quickly approached. The radio frequency spectrum for commercial wireless communications has become an expensively commodity. Since the number of subscribers is still growing rapidly, a more efficient use of frequency resources is inevitable to meet the future capacity needs. Hence, the Spatial Division Multiple Access (SDMA) is introduced to increase the capacity of such system. In this thesis, an adaptive antenna array with Uniform Circular Array (UCA) geometry at the base station for Personal Handy Phone System (PHS) - WLL system is used to increase the system capacity. The Direct Matrix Inversion (DMI) algorithm for weights adaptation is also used. The improvements in performance are observed by comparing with the omni-directional antenna. The effects of the following parameters, the number of antenna elements, the element spacing and the number of the beam patterns, to the system capacity are also studied. The simulation results show that around 1-2 dB of C/I is improved when the element spacing is increased more than 0.5A. And the capacity of the 4-element with 3/.element spacing is increased by factor of 5.14, the capacity of the 8-element with 2/.element spacing is increased by factor of 9.14, and also the capacity of the 12-element is increased by factor of 9.28 in comparison with respect to omni-directional antenna at 2 % blocking probability. |
| Year | 2002 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. TC-02-04 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Information and Communications Technologies (DICT) |
| Academic Program/FoS | Telecommunications (TC) |
| Chairperson(s) | Ahmed, Kazi M. ; |
| Examination Committee(s) | Erke, Tapio J. ;Teerapat Sanguankotchakorn; |
| Scholarship Donor(s) | Asian Institute of Technology - Partial Scholarship ;Telephone Organization of Thailand; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2002 |