Title:
MIMO MULTIPLEX COMMUNICATION APPARATUS AND SIGNAL SEPARATION METHOD
Document Type and Number:
WIPO Patent Application WO/2006/101093
Kind Code:
A1
Abstract:
A MIMO multiplex communication apparatus comprising a symbol replica candidate ranking part that ranks, in ascending order of expected branch metrics, residual received signals obtained by subtracting, from received signals subjected to an orthogonalization of transport signal using QR decomposition, the signal components of survival symbol replica candidates; a symbol replica candidate selecting part that selects symbol replica candidates in descending order of ranked symbol replica candidates; a branch metric calculating part that calculates the branch metrics of the selected symbol replica candidates; and a threshold comparing part that compares the calculated branch metrics with a predetermined threshold; wherein when a result of the comparison by the threshold comparing part shows that a branch metric is greater than the predetermined threshold, those ones of the symbol replica candidates which follow the corresponding stage are not subjected to the search but removed from the symbol replica candidates.
Inventors:
MAEDA NORIYUKI (JP)
KAWAI HIROYUKI (JP)
HIGUCHI KENICHI (JP)
SAWAHASHI MAMORU (JP)
KAWAI HIROYUKI (JP)
HIGUCHI KENICHI (JP)
SAWAHASHI MAMORU (JP)
Application Number:
PCT/JP2006/305601
Publication Date:
September 28, 2006
Filing Date:
March 20, 2006
Export Citation:
Assignee:
NTT DOCOMO INC (JP)
MAEDA NORIYUKI (JP)
KAWAI HIROYUKI (JP)
HIGUCHI KENICHI (JP)
SAWAHASHI MAMORU (JP)
MAEDA NORIYUKI (JP)
KAWAI HIROYUKI (JP)
HIGUCHI KENICHI (JP)
SAWAHASHI MAMORU (JP)
International Classes:
H04J99/00; H04B7/04
Foreign References:
| JP2004282757A | 2004-10-07 |
Other References:
MAEDA N. ET AL.: "Taju ni Okeru Shinraido Joho Ni Motoduku Tekio Ikinolori Symbol Replica Koho Sentaku o Tekiyo shita Sphere decoding Ho", IEICE TECHNICAL REPORT, vol. 104, no. 439, 18 November 2004 (2004-11-18), pages 67 - 72, XP003001678
KAWAI H. ET AL.: "Independent Adaptive Control of Surviving Symbol Replica Candidates at Each Stage Based on Minimum Branch Metric in QRD-MLD for OFCDM NIMO Multiplexing", PROCEEDINGS OF VTC, vol. 3, 26 September 2004 (2004-09-26), pages 1558 - 1564, XP010786897
HIGUCHI K. ET AL.: "Adaptive Selection of Surviving Symbol Replica Candidates Based on Maximum Reliability in QRD-MLD for OFCDM MINO Multiplexing", PROCEEDINGS OF GLOBECOM, vol. 4, 2004, pages 2480 - 2486, XP010757974
KAWAI H. ET AL.: "Independent Adaptive Control of Surviving Symbol Replica Candidates at Each Stage Based on Minimum Branch Metric in QRD-MLD for OFCDM NIMO Multiplexing", PROCEEDINGS OF VTC, vol. 3, 26 September 2004 (2004-09-26), pages 1558 - 1564, XP010786897
HIGUCHI K. ET AL.: "Adaptive Selection of Surviving Symbol Replica Candidates Based on Maximum Reliability in QRD-MLD for OFCDM MINO Multiplexing", PROCEEDINGS OF GLOBECOM, vol. 4, 2004, pages 2480 - 2486, XP010757974
Attorney, Agent or Firm:
Itoh, Tadahiko (Yebisu Garden Place Tower 20-3, Ebisu 4-chom, Shibuya-ku Tokyo, JP)
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