Adaptive equalizing apparatus and program therefor

Details Adaptive equalizing apparatus and program therefor Adaptive equalizing apparatus and program therefor

2007-05-08

2007-05-08

Bayard, Emmanuel (Department: 2611)

Pulse or digital communications

Equalizers

Automatic

C375S346000, C375S350000

Reexamination Certificate

active

10670562

ABSTRACT:
In an adaptive equalizing apparatus for MIMO (Multi-Input Multi-Output) turbo reception, an interference component in a received signal is subtracted therefrom using a replica of an interference component in an interference canceling part31n, the subtracted output is filtered by a filter32n, to cancel the remaining interference component and to perform multi-path combining, and in a degree-of-interference-cancellation estimation part 41nthe degree of interference cancellation β(i) is set such that it is 0 for the iteration number i=1, 0.8+0.05 (i−1) for 5≧i≧2 and 1 for i≧6, and at the beginning of each iteration filter coefficients are calculated using β(i) and a channel estimation value in a filter coefficient calculating part 33nand the filter coefficient thus calculated are set in the filter32n. An average value of soft decision symbol estimation values used in the interference canceling part may be used as β.

REFERENCES:
patent: 2002/0016560 (2002-02-01), Hansen
patent: 2002-33685 (2002-01-01), None
Daryl Reynolds, et al., “Low-Complexity Turbo-Equalization for Diversity Channels”, Signal Processing 81 (2001), pp. 989-995.
Hiroo Omori, et al., “A Matched Filter Approximation for SC/MMSE Iterative Equalizers”, IEEE Communications Letters, vol. 5, No. 7, Jul. 2001, pp. 310-312.
Siriklat Lek Ariyavisitakul, “Turbo Space-Time Processing to Improve Wireless Channel Capacity”, IEEE Transactions on Communications, vol. 48, No. 6, Aug. 2000, pp. 1347-1359.
Padam L. Kafle, et al., “Performance of Turbo Coded Multicarrier CDMA with Iterative Multiuser detection and Decoding”, Electrical and Computer Engineering, Canadian Conference, vol. 1, XP-010550822, May 13, 2001, pp. 105-110.

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