| Author | Surin Kittitornkun |
| Call Number | AIT Thesis no.TC-95-8 |
| Subject(s) | Cellular radio
|
| Note | A thesis submitted in partial fulfillment of the requirement for the degree of Master of Engineering. |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. TC-95-8 |
| Abstract | Personal Communications Services (PCS) are foreseen to be the future solutions of theterless multimedia communications for anyone, anywhere, and anytime by single number throughout multi-operator PCS networks. The over expected demand and highly competition of PCS operators might cause spectrum shortage. Even though the coexistence of cellular Direct Sequence/Code Division Multiple Access (DS/CDMA) with other networks is obviously possible, the performance study of CDMA/CDMA coexisting networks is necessary for air interface justifications and regulations. Therefore, performance of two coexisting networks in an urban area is investigated on both forward and reverse channels. Two similar systems of multiple of hexagonal-cell networks with I-kilometer cell radius are set up with fourth order path loss. As a consequence of urban buildings, the channel is modeled as an exponential multipath intensity profile having multipath Rayleigh fading channel. The wideband QPSK/OQPSK modulation/demodulation with coherent detection RAKE receiver is utilized for the sake of multipath diversity combining from multiple resolvable paths. Due to the limited power transmission and high attenuation from path loss, the total received average bit energy-to-background noise ratio (E~N0) is assumed to be 10 dB (2 times of IS-95). The area averaged error probability, the outage probability, and the system capacity are analyzed at various configurations of the coexisting network relative to the overlaid BS. In spite of 50% independent voice activity, the system capacity is drastically degraded in both directions. However, in particular configuration, less degradation in reverse channel is observed while forward channel is obviously better than others. Forward channel system capacity of this case could be improved further by the proposed forward power control. Although this power control improves much on forward channel, system capacity on each network is approximately half of those of the single network. In conclusion, coordination among PCS networks and lower voice probability are anticipated to enhance the system capacity of both networks. |
| Year | 1995 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. TC-95-8 |
| 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, K. M. |
| Examination Committee(s) | Erke, T.;MakeHiinen, K. |
| Scholarship Donor(s) | Deutscher Akademischer Austauchdienst (DAAD), Germany |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1995 |