An efficient code-timing estimator for DS-CDMA signals
We present an efficient algorithm for estimating the code timing of a known training sequence in an asynchronous direct-sequence code division multiple access (DS-CDMA) system. The algorithm is a large sample maximum likelihood (LSML) estimator that is derived by modeling the known training sequence...
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| Veröffentlicht in: | IEEE transactions on signal processing 1997-01, Vol.45 (1), p.82-89 |
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| container_title | IEEE transactions on signal processing |
| container_volume | 45 |
| creator | Dunmin Zheng Li, Jian Miller, S.L. Strom, E.G. |
| description | We present an efficient algorithm for estimating the code timing of a known training sequence in an asynchronous direct-sequence code division multiple access (DS-CDMA) system. The algorithm is a large sample maximum likelihood (LSML) estimator that is derived by modeling the known training sequence as the desired signal and all other signals including the interfering signals and thermal noise as unknown colored Gaussian noise that is uncorrelated with the desired signal. The LSML estimator is shown to be robust against the near-far problem and is also compared with several other code timing estimators via numerical examples. It is found that the LSML approach can offer noticeable performance improvement, especially when the loading of the system is heavy. |
| doi_str_mv | 10.1109/78.552207 |
| format | Article |
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| ispartof | IEEE transactions on signal processing, 1997-01, Vol.45 (1), p.82-89 |
| issn | 1053-587X 1941-0476 |
| language | eng |
| recordid | cdi_proquest_miscellaneous_28406844 |
| source | IEEE Xplore |
| subjects | Binary phase shift keying Colored noise Gaussian noise Maximum likelihood detection Maximum likelihood estimation Multiaccess communication Parameter estimation Phase estimation Propagation delay Timing |
| title | An efficient code-timing estimator for DS-CDMA signals |
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