Abstract
This paper introduces asynchronous orthogonal decision-feedback detector (AODFD) for asynchronous CDMA multiuser detection. The AODFD based on entire message-length detection is studied first. A realizable scheme, sliding-window AODFD, is then proposed and its performance is analyzed. In spite of its simple structure, the sliding-window AODFD can perform as desirably as ADDFD, which has a much higher complexity. The reduced complexity of the sliding-window AODFD is due to the use of orthogonal matched-filtering and a short window size. Different from ADDFD that requires computational intensive z-transformed matrix inversion and spectral factorization, AODFD uses agile Gram-Schmidt procedure. It is possible for AODFD to adopt a simple updating algorithm and parameter updating is no longer always necessary when users leave the system. The comparisons are also made with other orthogonal-based detectors and the bit error probability results show that the AODFD is an attractive multiuser detector.
Original language | English |
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Pages (from-to) | 1649-1658 |
Number of pages | 10 |
Journal | IEEE Transactions on Communications |
Volume | 49 |
Issue number | 9 |
DOIs | |
Publication status | Published - 2001 Sept |
All Science Journal Classification (ASJC) codes
- Electrical and Electronic Engineering