Parameter estimation of DS-CDMA mobile communication
The parameter estimation is a very important issue in DS-CDMA mobile communication. Since all users share the same frequency and time resource during communications, the multiple-access interference (MAI) must be considered with great care. It may be due to that the users' signals are not tr...
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| Format: | Theses and Dissertations |
| Language: | English |
| Published: |
2008
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| Subjects: | |
| Online Access: | http://hdl.handle.net/10356/13124 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | The parameter estimation is a very important issue in DS-CDMA mobile communication.
Since all users share the same frequency and time resource during
communications, the multiple-access interference (MAI) must be considered
with great care. It may be due to that the users' signals are not truly orthogonal
after spreading. When the communication is in a near-far environment, the
users' power levels may vary widely. This would result in the performance degradation
of the conventional CDMA system. In order to overcome this problem,
several near-far resistant detectors were reported. And these methods require
the signature waveforms' timing information. However, for the asynchronous
CDMA systems, even in a friendly communication scheme, the users' timing
information is often not known and need to be estimated. |
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