An investigation of a hybrid spread-spectrum CSMA-CD protocol for high-speed integrated services local area network | |
| Author | Liyanagama, Deepa L. |
| Call Number | AIT Thesis no. TC-92-7 |
| Subject(s) | Spread spectrum communications Local area networks (Computer networks) |
| Note | A thesis submitted in partial fulfillment of the requirement for the degree of Master of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Abstract | This study is aimed at investigating the performance of a Hybrid Code Division Multiple Access I Carrier-Sense Multiple Access with Collision Detection Protocol [CDMA/CSMA-CD]. This hybrid protocol employs CDMA embedded in a carrier-sensing protocol with overload detection and is referred to as Carrier/Channel-load Sense SpreadSpectrum with collision detection (CSSS/CD). This study concentrated on a one-persistent form of channel access. Depending on the channel access strategy, two different protocols, lP-CSSS/CD-1 and lP-CSSS/CD-M were identified. The network throughput was analysed for both of these protocols. The effect of bit errors, caused by multiuser interference, was also investigated for the 1 P-CSSS/CD-1 protocol with fixed length packets. With threshold approximations for the channel capacity, the network was modelled as a discrete-time semiMarkov process. Results are presented showing the effects of network parameters on the throughput. These results are compared with the performance of lP-CSMA/CD [Ethernet] under the same operating conditions and it is shown that a real capacity gain over Ethernet is achieved with the spread-spectrum protocol. An additional advantage of the spreadspectrum protocol is the low packet delay offered by the CDMA effect. System stability was evaluated using a general user model. |
| Year | 1992 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. TC-92-7 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Information and Communications Technologies (DICT) |
| Academic Program/FoS | Telecommunications (TC) |
| Chairperson(s) | O'Farrell, T. |
| Examination Committee(s) | Lochmann, S.;Murch, A.;Takahashi, K. |
| Scholarship Donor(s) | Norwegian Agency for International Development, Norway |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology,1992 |