Schur algorithms for joint-detection in TD-CDMA based mobile radio systems |
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Authors: | Marius Vollmer Martin Haardt Jürgen GÖtze |
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Affiliation: | 1. Arbeitsgebiet Datentechnik, Universit?t Dortmund, 44221, Dortmund, Allemagne 2. Siemens AG ICN CA CTO 7, Germany 3. University of Dortmund, Germany
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Abstract: | Third generation mobile radio systems will employ TD-CDMA in their TDD mode. In a TD-CDMA mobile radio system, joint-detection is equivalent to solving a least squares problem with a system matrix that exhibits some form of block-Toeplitz structure. This structure can be successfully exploited by using variations of the Schur algorithm for computing the QR decomposition of this system matrix. Together with a displacement representation, the Schur algorithm can be straightfonvardly adapted to a wide variety of matrix structures. In this paper we show this approach for two concrete manifestations of the TD-CDMA system matrix : first for a very compact, block-Toeplitz structure ; and second for the less favorable Toeplitz-block structure that arises when decision feedback is added to the data detection process. |
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