Fourier-transform based linear equalization for CDMA downlink

Details Fourier-transform based linear equalization for CDMA downlink Fourier-transform based linear equalization for CDMA downlink

2005-03-29

2005-03-29

Kizou, Hassan (Department: 2662)

Multiplex communications

Generalized orthogonal or special mathematical techniques

Fourier transform

C370S342000, C375S142000

Reexamination Certificate

active

06873596

ABSTRACT:
In the reception of a CDMA signal, the receiving unit performs a simplified process of linear equalization that eliminates the need for inverting the correlation matrix. For the single antenna reception case, the correlation matrix is approximated to a good degree by a circulation matrix that is diagonalized by FFT operations, thus substituting two FFTs and one IFFT having a complexity of O({fraction (3/2)}LFlog LF) for the direct matrix inversion having a complexity of O(LF3). The extension of this method uses a multiple antenna reception system with oversampling.

REFERENCES:
patent: 5343496 (1994-08-01), Honig et al.
patent: 5353300 (1994-10-01), Lee et al.
patent: 5623484 (1997-04-01), Muszynski
patent: 5831984 (1998-11-01), Hottinen
patent: 5872776 (1999-02-01), Yang
patent: 5970060 (1999-10-01), Baier et al.
patent: 6532254 (2003-03-01), Jokinen
patent: 6608859 (2003-08-01), De et al.
“Performance Evaluation of the Decorrelating Detector for DS-CDMA Systems over Multi-Path Rayleigh Fading Channels with AWGN”, Voorman et al., IEEE 1998, pp. 228-232.*
“Reduced Linear Decorrelator for Multipath Interference Rejection in CDMA”, Lee et al., IEEE 2002, pp.678680.*
“Linear Receivers for the DS-CDMA Downlink Exploiting Orthogonality of Spreading Sequences”, Ghauri, Irfan, et al., IEEE 1998, pp. 650-654.
“Fast Positive Definite Linear System Solvers”, Tewfik, A. H., IEEE Transactions On Signal Processing, vol. 42, No. 3, Mar., 1994, pp. 572-585.
“Kronecker Products and Matrix Calculus In System Theory”, Brewer, John W., IEEE Transactions On Circuits And Systems, vol. CAS 25, No. 9, Sep. 1978, pp. 772-781.
“Downlink Channel Decorrelation In CDMA Systems With Long Codes”, Werner, Stefan, et al., IEEE 1999, pp. 1614-1617.
“Low-Complexity Implementation Of CDMA Downlink Equalization”, Mailaender, L., IEEE, RG Mobile Communication Technologies, Mar. 2001, pp. 396-400.
“Data Detection Algorithms Specially Designed For The Downlink Of CDMA Mobile Radio Systems”, Klein, Anja, IEEE, 1997, pp. 203-206.
“MMSE Equalization For Forward Link In 3G CDMA: Symbol-Level Versus Chip-Level”, Krauss, Thomas P., et al., IEEE 2000, pp. 18-22.
“A Novel Blind Adaptive Algorithm for Channel Equalization in WCDMA Downlink”, Heikkila, Markku J., et al., IEEE 2001, pp. 4-41-4-45.
“Interference Suppression in CDMA Downlink through Adaptive Channel Equalization”, Heikkila, Markku J., et al., 5 pages.

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