JP4658139B2 - ドップラー予測 - Google Patents
ドップラー予測 Download PDFInfo
- Publication number
- JP4658139B2 JP4658139B2 JP2007546208A JP2007546208A JP4658139B2 JP 4658139 B2 JP4658139 B2 JP 4658139B2 JP 2007546208 A JP2007546208 A JP 2007546208A JP 2007546208 A JP2007546208 A JP 2007546208A JP 4658139 B2 JP4658139 B2 JP 4658139B2
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- JP
- Japan
- Prior art keywords
- doppler
- prediction
- receiver
- doppler spread
- diffusion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S11/00—Systems for determining distance or velocity not using reflection or reradiation
- G01S11/02—Systems for determining distance or velocity not using reflection or reradiation using radio waves
- G01S11/06—Systems for determining distance or velocity not using reflection or reradiation using radio waves using intensity measurements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/01—Reducing phase shift
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
- Mobile Radio Communication Systems (AREA)
- Radar Systems Or Details Thereof (AREA)
- Position Fixing By Use Of Radio Waves (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Description
送信機が受信機に対して移動する場合、受信信号はよく知られるドップラー効果の影響を受けることになる。すなわち、受信信号の振幅は、受信機および送信機が相対的に移動する速度に比例して変化することになる。
送信機および受信機を備える無線通信システムに対して、アンテナインタフェースおよび空中線インタフェースは、時間に応じて変化するチャネルh(t)として考えることができる。ここで、tは時間指標である。パイロット信号s(t)を送信する場合、アンテナの空中線インタフェースを経る受信信号は、以下のように書くことができる。
上式で、w(t)は、対象以外の送信機からの付加雑音または干渉である。
II: h^(t)=r(t)・s*(t)=h(t)+w(t)・s*(t)
雑音の寄与は、白色雑音信号、即ち平坦なスペクトラムを持つ信号としてモデル化することがよくある。その時間領域の例を図2に示す。この場合、チャネルは積分または累積間隔TACCを使用してより正確に予測することができる。
国際公開第WO03/077445号では、ドップラー拡散予測を行う方法が提示された。対応する数式をこの出願の数式(12a)および数式(13a)に示した。ドップラー拡散の予測に対するその他の類似する数式を(12b)および(13b)に示したが、これはC.テペデレンリオグル(C.Tepedelenlioglu)、A.アブディ(A.Abdi)、G.ジアンナキス(G.Giannakis)およびM.カヴェー(M.Kaveh)「ハンドオフアプリケーションおよび適応伝送を有する移動通信におけるドップラー拡散および信号強度の予測("Estimation of Doppler spread and signal strength in mobile communications with applications to handoff and adaptive transmission")」、無線通信と移動コンピューティング(Wireless communications and Mobile Computing)、221−242頁、2001年1月1日に記載されている。
図1に関して以上に記述したように、受信復調信号、
以下の表記を使用する:
ドップラーシフト:
最大ドップラー拡散周波数:
例えば、最大のドップラー拡散の予測は、次式のように計算することができる。
Claims (5)
- 送信機(TX)と通信する受信機(RX)であって、
復調ユニット(X)と、
ドップラー予測ユニット(DEU:Doppler estimation unit)とを備え、
前記ドップラー予測ユニットは、請求項1又は2に記載の受信信号の前記ドップラー拡散の予測を行うことを特徴とする受信機。 - 請求項3に記載の受信機であって、
前記ドップラー拡散の予測は、前記受信信号を復号化するための累積間隔TACCを規定するために使用されることを特徴とする受信機。 - 請求項3に記載の受信機であって、
前記ドップラー拡散の予測は、無線チャネルh(t)の品質を予測するために使用されることを特徴とする受信機。
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/IB2004/052815 WO2006064310A1 (en) | 2004-12-15 | 2004-12-15 | Doppler estimation |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2008530827A JP2008530827A (ja) | 2008-08-07 |
JP4658139B2 true JP4658139B2 (ja) | 2011-03-23 |
Family
ID=36587582
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2007546208A Active JP4658139B2 (ja) | 2004-12-15 | 2004-12-15 | ドップラー予測 |
Country Status (10)
Country | Link |
---|---|
US (1) | US7899402B2 (ja) |
EP (1) | EP1829244B2 (ja) |
JP (1) | JP4658139B2 (ja) |
KR (1) | KR101059323B1 (ja) |
CN (1) | CN101080880B (ja) |
AT (1) | ATE470276T1 (ja) |
DE (1) | DE602004027557D1 (ja) |
ES (1) | ES2346657T5 (ja) |
PL (1) | PL1829244T5 (ja) |
WO (1) | WO2006064310A1 (ja) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010047037A1 (en) * | 2008-10-24 | 2010-04-29 | Nec Corporation | Device and method for estimating doppler spread in a mobile communications terminal |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003077445A1 (en) * | 2002-02-18 | 2003-09-18 | Telefonaktiebolaget Lm Ericsson (Publ) | Doppler shift and spread estimation method and apparatus |
US6636574B2 (en) * | 2001-05-31 | 2003-10-21 | Motorola, Inc. | Doppler spread/velocity estimation in mobile wireless communication devices and methods therefor |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5007068A (en) * | 1988-06-07 | 1991-04-09 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Doppler-corrected differential detection system |
US6563861B1 (en) * | 1999-03-22 | 2003-05-13 | Ericsson, Inc. | Doppler spread estimation system |
US6603819B1 (en) * | 2000-02-25 | 2003-08-05 | Northrop Grumman Corporation | Radio symbol synchronization and doppler estimation techniques |
-
2004
- 2004-12-15 JP JP2007546208A patent/JP4658139B2/ja active Active
- 2004-12-15 CN CN2004800446248A patent/CN101080880B/zh active Active
- 2004-12-15 KR KR1020077012904A patent/KR101059323B1/ko active IP Right Grant
- 2004-12-15 PL PL04806576T patent/PL1829244T5/pl unknown
- 2004-12-15 DE DE602004027557T patent/DE602004027557D1/de active Active
- 2004-12-15 ES ES04806576T patent/ES2346657T5/es active Active
- 2004-12-15 EP EP04806576A patent/EP1829244B2/en active Active
- 2004-12-15 US US11/721,580 patent/US7899402B2/en active Active
- 2004-12-15 WO PCT/IB2004/052815 patent/WO2006064310A1/en active Application Filing
- 2004-12-15 AT AT04806576T patent/ATE470276T1/de not_active IP Right Cessation
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6636574B2 (en) * | 2001-05-31 | 2003-10-21 | Motorola, Inc. | Doppler spread/velocity estimation in mobile wireless communication devices and methods therefor |
WO2003077445A1 (en) * | 2002-02-18 | 2003-09-18 | Telefonaktiebolaget Lm Ericsson (Publ) | Doppler shift and spread estimation method and apparatus |
Also Published As
Publication number | Publication date |
---|---|
EP1829244B2 (en) | 2013-01-16 |
DE602004027557D1 (de) | 2010-07-15 |
PL1829244T5 (pl) | 2013-06-28 |
ATE470276T1 (de) | 2010-06-15 |
CN101080880B (zh) | 2011-09-07 |
WO2006064310A1 (en) | 2006-06-22 |
KR20070085895A (ko) | 2007-08-27 |
ES2346657T3 (es) | 2010-10-19 |
PL1829244T3 (pl) | 2010-11-30 |
EP1829244A1 (en) | 2007-09-05 |
JP2008530827A (ja) | 2008-08-07 |
US20090325498A1 (en) | 2009-12-31 |
EP1829244B1 (en) | 2010-06-02 |
ES2346657T5 (es) | 2013-05-14 |
KR101059323B1 (ko) | 2011-08-24 |
US7899402B2 (en) | 2011-03-01 |
CN101080880A (zh) | 2007-11-28 |
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