Multiuser detector for variable spreading factors

Details Multiuser detector for variable spreading factors Multiuser detector for variable spreading factors

2004-02-23

2008-10-28

Shah, Chirag G (Department: 2619)

Multiplex communications

Communication over free space

Combining or distributing information via code word channels...

Reexamination Certificate

active

07443828

ABSTRACT:
A plurality of communication signals have differing spreading codes. Each communication has an associated code comprising chips. For each chip of each communication, a vector of that chip convolved with an impulse response is produced. For each communication, support blocks comprising the chip vectors are produced. A number of the chip vectors in a support block is based on that communication's spreading factor. A system response matrix is assembled. The system response matrix has symbol sub-matrices. Each symbol sub-matrix comprises a support block from each communication. Data of the communications is detected using the symbol response matrix.

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Klein et al., “Zero Forcing and Minimum Mean-Square-Error Equalization for Multiuser Detection in Code-Division Multiple-Access Channels,” IEEE Transactions on Vehicular Technology, US, IEEE Inc. New York, vol. 45, No. 2, May 1, 1996 pp. 276-287.
Karimi et al., “A Novel and Efficient Solution to Block-Based Joint-Detection Using Approximate Cholesky Factorization,” IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, vol. 3, 1998, pp. 1340-1345.
Mayer et al., “Realtime Feasibility of Joint Detection CDMA,” EPMCC, European Personal Mobile Communications Conference Together with Kommunikation, vol. 145, No. 145, 1997, pp. 245-325.
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Karimi, et al., “A Novel and Efficient Solution to Block-Based Joint-Detection Using Approximate Cholesky Factorization,” IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, vol. 3, pp. 1340-1345, 1998.
Klein, et al., “Zero Forcing and Minimum Mean-Square-Error Equalization for Multiuser Detection in Code-Division Multiple-Access Channels,” IEEE Transactions on Vehicular Technology, US, IEEE Inc. New York, vol. 45, No. 2, pp. 276-287, May 1, 1996.
Mayer et al., “Realtime Feasibility of Joint Detection CDMA,” EPMCC, European Personal Mobile Communications Conference Together with Kommunikation, vol. 145, No. 145, pp. 245-325, 1997.
Vollmer, et al., “Comparative Study of Joint-Detection Techniques for TD-CDMA Based Mobile Radio Systems,” IEEE Journal On Selected Areas In Communications, vol. 19, No. 8, pp. 1461-1475, Aug. 2001.

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