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Wireless digital point to multipoint link utilizing wideband CDMA
One of the proposed techniques for multiple access communications for the third generation is code division multiple access (CDMA). This has been shown to be a viable alternative to both TDMA and FDMA. While there does not appear to be a single multiple accessing technique that is superior to others...
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| Format: | Thesis |
| Language: | English |
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Department of Electrical Engineering
2016
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| _version_ | 1867611274967252992 |
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| access_status_str | Open Access |
| author | Ambekar, Sanjay |
| author2 | Braun, R M |
| author_browse | Ambekar, Sanjay Braun, R M |
| author_facet | Braun, R M Ambekar, Sanjay |
| author_sort | Ambekar, Sanjay |
| collection | Thesis |
| description | One of the proposed techniques for multiple access communications for the third generation is code division multiple access (CDMA). This has been shown to be a viable alternative to both TDMA and FDMA. While there does not appear to be a single multiple accessing technique that is superior to others in all situations, there are characteristics of CDMA that give it a distinct advantage over the other multiple access techniques. In CDMA each user is provided with an unique, orthogonal code. If these K codes are orthogonal and uncorrelated with each other, than K independent users can transmit at the same time and in the same radio bandwidth. The receivers decorrelate the information and regenerate the original transmitted signal. It must be noted that the term "Wideband CDMA" is used comparatively to the only existing commercial CDMA system, IS-95 which uses a spectral bandwidth of only 1.2288 MHz. This thesis examines and evaluates a good set of orthonormal codes (orthogonal and normalized to have equal power) and their application to providing accessing for a point to multipoint (PMP) stationary system. The correlation properties, design and constellation properties of these codes are investigated. The system model is then simulated using Systemview and then evaluated in terms of it's bit error rate, user capacity and Erlang with addition of users to the system. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/17856 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2016 |
| publishDateRange | 2016 |
| publishDateSort | 2016 |
| publisher | Department of Electrical Engineering |
| publisherStr | Department of Electrical Engineering |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/17856 Wireless digital point to multipoint link utilizing wideband CDMA Ambekar, Sanjay Braun, R M Communications Engineering One of the proposed techniques for multiple access communications for the third generation is code division multiple access (CDMA). This has been shown to be a viable alternative to both TDMA and FDMA. While there does not appear to be a single multiple accessing technique that is superior to others in all situations, there are characteristics of CDMA that give it a distinct advantage over the other multiple access techniques. In CDMA each user is provided with an unique, orthogonal code. If these K codes are orthogonal and uncorrelated with each other, than K independent users can transmit at the same time and in the same radio bandwidth. The receivers decorrelate the information and regenerate the original transmitted signal. It must be noted that the term "Wideband CDMA" is used comparatively to the only existing commercial CDMA system, IS-95 which uses a spectral bandwidth of only 1.2288 MHz. This thesis examines and evaluates a good set of orthonormal codes (orthogonal and normalized to have equal power) and their application to providing accessing for a point to multipoint (PMP) stationary system. The correlation properties, design and constellation properties of these codes are investigated. The system model is then simulated using Systemview and then evaluated in terms of it's bit error rate, user capacity and Erlang with addition of users to the system. 2016-03-17T07:05:12Z 2016-03-17T07:05:12Z 1998 Master Thesis Masters MSc (Eng) http://hdl.handle.net/11427/17856 eng application/pdf Department of Electrical Engineering Faculty of Engineering and the Built Environment University of Cape Town |
| spellingShingle | Communications Engineering Ambekar, Sanjay Wireless digital point to multipoint link utilizing wideband CDMA |
| thesis_degree_str | Master's |
| title | Wireless digital point to multipoint link utilizing wideband CDMA |
| title_full | Wireless digital point to multipoint link utilizing wideband CDMA |
| title_fullStr | Wireless digital point to multipoint link utilizing wideband CDMA |
| title_full_unstemmed | Wireless digital point to multipoint link utilizing wideband CDMA |
| title_short | Wireless digital point to multipoint link utilizing wideband CDMA |
| title_sort | wireless digital point to multipoint link utilizing wideband cdma |
| topic | Communications Engineering |
| url | http://hdl.handle.net/11427/17856 |
| work_keys_str_mv | AT ambekarsanjay wirelessdigitalpointtomultipointlinkutilizingwidebandcdma |