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Orthogonal frequency division multiplexing (OFDM) is effective to cope with multipath interference. However, acoustic underwater communication requires a very long guard interval, so which decreases an effective transmission speed and delays a received response. Since OFDM sets a guard interval (GI) in accordance with maximum delay time in multipath, we study various diversity techniques to obtain sufficient communication quality even for a short GI for underwater communications. It is well known that Maximum ratio combining (MRC) is superior to selective combining (SC) in terms of improvement of signal-to-noise ratio (SNR). However, we have found that SC provides better communication performance than MRC on the conditions that a multipath delay exceeds GI and OFDM symbol duration. Moreoever combining diversity techniques in frequency-, space-, and time-domain, shows communication performance improvement of 20-dB in CNR.", "subitem_description_language": "en", "subitem_description_type": "Abstract"}]}, "item_5_publisher_32": {"attribute_name": "\u51fa\u7248\u8005", "attribute_value_mlt": [{"subitem_publisher": "\u96fb\u5b50\u60c5\u5831\u901a\u4fe1\u5b66\u4f1a", "subitem_publisher_language": "ja"}]}, "item_5_rights_12": {"attribute_name": "\u6a29\u5229", "attribute_value_mlt": [{"subitem_rights": "c2014 by IEICE"}]}, "item_5_select_15": {"attribute_name": "\u8457\u8005\u7248\u30d5\u30e9\u30b0", "attribute_value_mlt": [{"subitem_select_item": "publisher"}]}, "item_5_source_id_7": {"attribute_name": "ISSN", "attribute_value_mlt": [{"subitem_source_identifier": "0913-5685", "subitem_source_identifier_type": "PISSN"}]}, "item_access_right": {"attribute_name": "\u30a2\u30af\u30bb\u30b9\u6a29", "attribute_value_mlt": [{"subitem_access_right": "open access", "subitem_access_right_uri": "http://purl.org/coar/access_right/c_abf2"}]}, "item_creator": {"attribute_name": "\u8457\u8005", "attribute_type": "creator", "attribute_value_mlt": [{"creatorNames": [{"creatorName": "\u77f3\u672c, \u9686\u592a", "creatorNameLang": "ja"}], "nameIdentifiers": [{"nameIdentifier": "89928", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "\u8d64\u7530, \u77ac", "creatorNameLang": "ja"}], "nameIdentifiers": [{"nameIdentifier": "89929", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "\u5409\u6fa4 , \u771f\u543e", "creatorNameLang": "ja"}], "nameIdentifiers": [{"nameIdentifier": "298", "nameIdentifierScheme": "WEKO"}, {"nameIdentifier": "20447080", "nameIdentifierScheme": "KAKEN - 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