Title:
ROBUST FREQUENCY-DOMAIN EQUALIZATION IN COMMUNICATIONS RECEIVERS
Document Type and Number:
WIPO Patent Application WO/2013/112076
Kind Code:
A3
Abstract:
MMSE equalization in the frequency domain is emulated by applying intermediate weights on a per-frequency-bin basis and re-scaling each bin output to recover proper MMSE scaling. Time- domain samples of a received signal are transformed into a frequency-domain representation of the received signal. A frequency-domain representation of a channel response for the radio channel is calculated, and a frequency-domain representation of impairments to the desired signal is generated, the frequency-domain representation of the impairments comprising an impairment covariance matrix for each of the frequency bins. A scaling factor for each of frequency bins is calculated, based on a bin-specific signal-quality estimate for each bin, and an equalized frequency-domain sample for each of the frequency bins is computed, as a function of the scaling factors, the frequency-domain representation of the channel response, and the generated frequency-domain representation of impairments. The equalized frequency-domain samples are transformed into an equalized time-domain sample sequence.
Inventors:
REIAL ANDRES (SE)
Application Number:
PCT/SE2012/000210
Publication Date:
November 07, 2013
Filing Date:
December 20, 2012
Export Citation:
Assignee:
ERICSSON TELEFON AB L M (SE)
International Classes:
H04B1/10; H04B1/7105
Domestic Patent References:
| WO2011155882A1 | 2011-12-15 |
Foreign References:
| US20060280257A1 | 2006-12-14 | |||
| US20080304554A1 | 2008-12-11 | |||
| US20070058735A1 | 2007-03-15 |
Other References:
S. J. GRANT ET AL.: "Generalized RAKE receivers for MIMO systems", VEHICULAR TECHNOLOGY CONFERENCE, 2003. VTC 2003-FALL. 2003 IEEE 58TH, vol. 1, 6 October 2003 (2003-10-06) - 9 October 2003 (2003-10-09), ORLANDO, FL, USA, pages 424 - 428
K. TAKEDA ET AL.: "Frequency-Domain MMSE Channel Estimation for Frequency-Domain Equalization of DS-CDMA Signals", IEICE TRANSACTIONS ON COMMUNICATIONS, no. 7, 1 July 2007 (2007-07-01), TOKYO, JP, pages 1746 - 1753, XP001506607, DOI: doi:10.1093/ietcom/e90-b.7.1746
J. ZHANG ET AL.: "Improved Frequency Domain Channel Estimation and Equalization for MIMO Wireless Communications", INTERNATIONAL JOURNAL OF WIRELESS INFORMATION NETWORKS, 24 March 2009 (2009-03-24)
K. TAKEDA ET AL.: "Frequency-Domain MMSE Channel Estimation for Frequency-Domain Equalization of DS-CDMA Signals", IEICE TRANSACTIONS ON COMMUNICATIONS, no. 7, 1 July 2007 (2007-07-01), TOKYO, JP, pages 1746 - 1753, XP001506607, DOI: doi:10.1093/ietcom/e90-b.7.1746
J. ZHANG ET AL.: "Improved Frequency Domain Channel Estimation and Equalization for MIMO Wireless Communications", INTERNATIONAL JOURNAL OF WIRELESS INFORMATION NETWORKS, 24 March 2009 (2009-03-24)
Attorney, Agent or Firm:
ERICSSON AB (Lund, SE)
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