| 摘要 |
We consider the problem of multi-user detection for CDMA systems where the codes of some users are known while others are unknown, semi-blind multi-user detection. An example is at the base station of a cellular communication system with interference from both in-cell users, with known codes, and out-of cell users, with unknown codes. In this paper we develop a number of semi-blind multi-user detectors using a subspace approach. One class of detectors developed has a computationally efficient structure of a subspace estimation common to all known users, followed by a simple processing specific to each user. The performance of the detectors is compared to that of the purely blind detector and the non-blind detector, and the semi-blind detectors are seen to have the best performance.
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