IEEE802.11A装置間における相互動作のための変更されたIEEE802.11A

Japanese Patent JP4838241

B2

To detect the number of transmit antennas, a fast Fourier transform operation is performed on the received samples of the transmitted long training symbols of a preamble. Next, each of the Fourier transformed results is multiplied with the reference frequency-domain representation of the long training symbol so as to remove the effect of the symbols and to maintain the channel information. Next, inverse Fourier transform or least squares operations is performed on the multiplied values to compute channel impulse response. The number of shifted impulse response in the channel impulse response represents the detected number of transmit antennas. Packets containing preambles of the present invention may be received by extended devices as well as by legacy receivers that are not configured to receive and interpret these preambles. The training symbols may be cyclically-shifted and transmitted on different transmit antennas.

Van zelst, albert
Jones, Vincent, Kay.
Van Nay, Richard, Dee., Jay.

JP2007515341A

December 14, 2011

May 27, 2005

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QUALCOMM INCORPORATED

H04J99/00; H03C7/02; H04B1/02; H04B7/02; H04B7/04; H04K1/10; H04L1/02; H04L1/06; H04L12/28; H04L12/56; H04L25/02; H04L27/26; H04W92/10; H04B7/06; H04J11/00; H04W84/12

JP2005286868A	2005-10-13
JP2005295239A	2005-10-20
JP2007515861A	2007-06-14

Kurata Masatoshi
Satoshi Kono
Makoto Nakamura
Yoshihiro Fukuhara
Takashi Mine
Toshio Shirane
Sadao Muramatsu
Nobuhisa Nogawa
Kocho Chojiro
Naoki Kono
Katsu Sunagawa
Katsumura Hiro
Ryo Hashimoto
Tetsuya Kazama
Shoji Kawai
Tatsushi Sato
Takashi Okada
Mihoko Horiuchi
Takenori Masanori
Takuzo Ichihara
Yamashita Gen

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