NOISE VARIANCE ESTIMATION IN WIRELESS COMMUNICATIONS FOR DIVERSITY COMBINING AND LOG-LIKELIHOOD SCALING

Title:

NOISE VARIANCE ESTIMATION IN WIRELESS COMMUNICATIONS FOR DIVERSITY COMBINING AND LOG-LIKELIHOOD SCALING

Document Type and Number:

Japanese Patent JP2010252362

Kind Code:

A

Abstract:

To provide a technique for an improved demodulation process that considers thermal noise for one or more antennas mounted on a receiver, regarding noise variance estimation in wireless communications.

Noise variance estimation includes: receiving a signal including an OFDM symbol having in-band tones including in-band pilot tones and band-edge tones including band-edge pilot tones and guard tones; estimating an equivalent noise variance for the in-band tones using the in-band pilot tones and channel estimates for the in-band pilot tones; and estimating an equivalent noise variance for the band-edge tones using the band-edge pilot tones, channel estimates for the band-edge pilot tones, and the guard tones.

Inventors:

NAMGOONG JUNE
XU HAO
BLACK PETER J
JAYARAMAN SRIKANT

Application Number:

JP2010125972A

Publication Date:

November 04, 2010

Filing Date:

June 01, 2010

Export Citation:

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Assignee:

QUALCOMM INC

International Classes:

H04J11/00; H04B1/707; H04B1/712; H04B7/08; H04W16/28; H04W72/04

Domestic Patent References:

JP2001203656A	2001-07-27
JP2003051804A	2003-02-21
JP2004208254A	2004-07-22
JPH0575568A	1993-03-26
JP2003298547A	2003-10-17
JP2001203656A	2001-07-27
JP2003051804A	2003-02-21
JP2004208254A	2004-07-22
JPH0575568A	1993-03-26
JP2003298547A	2003-10-17

Foreign References:

EP1792462B1	2008-07-09
WO2004073276A1	2004-08-26

Other References:

JPN6012041295; 高岡　辰輔　外１名: '周波数選択性フェージング環境下でのＯＦＤＭ受信における適応予測繰り返しチャネル推定' 電子情報通信学会技術研究報告Ｖｏｌ．１０２，　Ｎｏ．２８２, 20020823, ｐｐ．６５-７０
JPN6008019261; 須山　聡　外４名: 'ガードインターバルを超える遅延プロファイルのマルチパス環境に対するＯＦＤＭ受信方式' 電子情報通信学会技術研究報告Ｖｏｌ．１０１，　Ｎｏ．４３６, 20011112, ｐｐ．４５-５０
JPN6012039081; Ｃ．Ｒ．Ｎ．　Ａｔｈａｕｄａｇｅ　ｅｔ　ａｌ．: 'Ｌｏｗ-ｃｏｍｐｌｅｘｉｔｙ　Ｃｈａｎｎｅｌ　Ｅｓｔｉｍａｔｉｏｎ　ｆｏｒ　Ｗｉｒｅｌｅｓｓ　ＯＦＤＭ　Ｓｙｓｔｅｍｓ' Ｐｅｒｓｏｎａｌ，　Ｉｎｄｏｏｒ，　ａｎｄ　Ｍｏｂｉｌｅ　Ｒａｄｉｏ　Ｃｏｍｍｕｎｉｃａｔｉｏｎｓ，　２００３．　ＰＩＭＲＣ　２００３．Ｖｏｌ．１, 20030910, ｐｐ．５２１-５２５
JPN6012041293; 佐尾　智基　外１名: '周波数選択性フェージング環境下でのＯＦＤＭ-ＣＤＭＡ受信における雑音強調を抑圧する周波数等化' 電子情報通信学会技術研究報告Ｖｏｌ．１０１，　Ｎｏ．６８５, 20020227, ｐｐ．２４９-２５６
JPN6012041295; 高岡　辰輔　外１名: '周波数選択性フェージング環境下でのＯＦＤＭ受信における適応予測繰り返しチャネル推定' 電子情報通信学会技術研究報告Ｖｏｌ．１０２，　Ｎｏ．２８２, 20020823, ｐｐ．６５-７０
JPN6008019261; 須山　聡　外４名: 'ガードインターバルを超える遅延プロファイルのマルチパス環境に対するＯＦＤＭ受信方式' 電子情報通信学会技術研究報告Ｖｏｌ．１０１，　Ｎｏ．４３６, 20011112, ｐｐ．４５-５０
JPN6012039081; Ｃ．Ｒ．Ｎ．　Ａｔｈａｕｄａｇｅ　ｅｔ　ａｌ．: 'Ｌｏｗ-ｃｏｍｐｌｅｘｉｔｙ　Ｃｈａｎｎｅｌ　Ｅｓｔｉｍａｔｉｏｎ　ｆｏｒ　Ｗｉｒｅｌｅｓｓ　ＯＦＤＭ　Ｓｙｓｔｅｍｓ' Ｐｅｒｓｏｎａｌ，　Ｉｎｄｏｏｒ，　ａｎｄ　Ｍｏｂｉｌｅ　Ｒａｄｉｏ　Ｃｏｍｍｕｎｉｃａｔｉｏｎｓ，　２００３．　ＰＩＭＲＣ　２００３．Ｖｏｌ．１, 20030910, ｐｐ．５２１-５２５
JPN6012041293; 佐尾　智基　外１名: '周波数選択性フェージング環境下でのＯＦＤＭ-ＣＤＭＡ受信における雑音強調を抑圧する周波数等化' 電子情報通信学会技術研究報告Ｖｏｌ．１０１，　Ｎｏ．６８５, 20020227, ｐｐ．２４９-２５６

Attorney, Agent or Firm:

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

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