Title:
RECEPTION APPARATUS PERFORMING TURBO EQUALIZATIONS
Document Type and Number:
WIPO Patent Application WO/2015/151713
Kind Code:
A1
Abstract:
Disclosed is a reception apparatus that has solved a problem that fluctuations cannot be followed immediately after a commencement of turbo equalization in a high-speed fading environment. The reception apparatus comprises a soft interference canceler, an MMSE equalizer, a likelihood calculation unit, a deinterleaver, an SISO decoder, an information bit hard decision device, a subtracter, an interleaver, a soft estimation value calculation unit, a 0 storage device, a known signal storage memory unit, a transmission path estimator, and a plurality of switches. At the time of the first equalization, the transmission path estimator uses, as a reference signal, a known signal stored in the known signal storage memory unit or an output from the MMSE equalizer. At the time of each of the second and following equalizations, the transmission path estimator uses, as the reference signal, the known signal stored in the known signal storage memory unit or an output from the soft estimation value calculation unit. On the other hand, at time of the first equalization, the interference canceler is given a 0-value from the 0 storage device as the reference signal.
Inventors:
ITO KEI (JP)
YAMAMOTO KEISUKE (JP)
NAKADA TATSUHIRO (JP)
YAMAMOTO KEISUKE (JP)
NAKADA TATSUHIRO (JP)
Application Number:
PCT/JP2015/056499
Publication Date:
October 08, 2015
Filing Date:
March 05, 2015
Export Citation:
Assignee:
HITACHI INT ELECTRIC INC (JP)
International Classes:
H04L27/00; H03M13/45; H04B1/10; H04B7/005
Foreign References:
| JP2002190744A | 2002-07-05 | |||
| JP2012213135A | 2012-11-01 | |||
| JP2009188640A | 2009-08-20 | |||
| US6813219B1 | 2004-11-02 |
Other References:
TADASHI MATSUMOTO ET AL.: "Turbo Equalization: Fundamentals and Information Theoretic Considerations", THE TRANSACTIONS OF THE INSTITUTE OF ELECTRONICS, INFORMATION AND COMMUNICATION ENGINEERS B, vol. J90-B, no. 1, January 2007 (2007-01-01), pages 1 - 16, XP008143434
Y. GONG ET AL.: "MMSE Turbo Equalizer for Channels with Cochannel Interference", 2006 IEEE INTERNATIONAL CONFERENCE ON ACOUSTICS, SPEECH AND SIGNAL PROCESSING (2006. ICASSP, vol. 4, May 2006 (2006-05-01), pages 437 - 440, XP010931076
Y. GONG ET AL.: "MMSE Turbo Equalizer for Channels with Cochannel Interference", 2006 IEEE INTERNATIONAL CONFERENCE ON ACOUSTICS, SPEECH AND SIGNAL PROCESSING (2006. ICASSP, vol. 4, May 2006 (2006-05-01), pages 437 - 440, XP010931076
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