JP5627023B2 - 適応iip2校正 - Google Patents
適応iip2校正 Download PDFInfo
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- JP5627023B2 JP5627023B2 JP2011531051A JP2011531051A JP5627023B2 JP 5627023 B2 JP5627023 B2 JP 5627023B2 JP 2011531051 A JP2011531051 A JP 2011531051A JP 2011531051 A JP2011531051 A JP 2011531051A JP 5627023 B2 JP5627023 B2 JP 5627023B2
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- JP
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- Prior art keywords
- iip2
- receiver
- estimator
- signal
- controller
- 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
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/109—Means associated with receiver for limiting or suppressing noise or interference by improving strong signal performance of the receiver when strong unwanted signals are present at the receiver input
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
- H04B17/21—Monitoring; Testing of receivers for calibration; for correcting measurements
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Transceivers (AREA)
- Circuits Of Receivers In General (AREA)
- Noise Elimination (AREA)
- Transmitters (AREA)
Description
IMD2=P1n-(IP2-(P1n))=-25-(25-(-25))=-75dBm=3.16μwatts
送信信号が最高電力の25dBである場合、相互トランスダクタンス増幅器の入力に転送されたIMD2は、−75dBm(図示せず)である。0.1%の低ビットエラーレートを達成するためにパワー・スペクトラル密度は、各国の第三世代携帯電話の統一規格推進の規格制定団体の協力機構(Third Partnership Project、3GPP)によって標準規定された感度設定のとおりに、−106.7dbmまたはそれ以下でなければならない。この引例の熱雑音kTBFは約−99dBmである。所望信号の帯域幅におけるIMD2の電力は、kTBFよりはるかに大きいため、感度は−82.7dBに上昇し、すなわち必要な感度より24dB以上となる。したがって、受信器は3GPP標準の規定を満たすために十分大きなIP2が必要であり、特にSAWを有さないダイレクトコンバージョン受信器を含む。
図6に示されるQ−チャンネルに対する最小#a2Qとそれに対応するv2Qと異なる。
{+1、−1}または{−1,+1}の場合、傾斜方向は「+1」である。
そうでなければ、傾斜方向は0、すなわちsgn{Δ#a2I}=0である。
Claims (3)
- 送信器を含む送受信機の受信器の入力に関する二次インターセプトポイント(IIP2)校正システムであって、
前記送受信機の送信器及び受信器に接続され、前記受信器のミキサで生じた二次相互変調歪を含む受信信号と、前記送信器からのライブ送信信号と、適応レート係数とに基づいてIIP2係数の推定値を推定する推定器と、
前記推定器に接続され、前記IIP2係数の推定値とコントローラの動作レートの更新レートとに基づいて前記ミキサのIIP2調整ポートを調整するための調整電圧を調整して二次相互変調歪を減少させるコントローラと、
前記推定器及び前記コントローラを設定する状態機械と
を備え、
前記状態機械は、前記受信器の検出された受信信号強度に対する前記送信器の送信電力の比に基づいて、前記推定器の適応レート係数と前記コントローラの動作レートの更新レートとを設定する、校正システム。 - 前記推定器は、前記IIP2係数の推定値の推定において、ベースバンド受信信号から直流電流を推定する、請求項1に記載のIIP2校正システム。
- 送信器を含む送受信機の受信器におけるミキサの入力に関する二次インターセプトポイント(IIP2)を調整する方法であって、
電力出力が所定電力出力レベルFより大きいかどうかを判定するステップと、
前記受信器の受信信号強度指示が予め設定された受信信号強度の指示レベルHより小さいかどうかを判定するステップと、
IIP2推定器の適応レート係数の数値とIIP2コントローラの動作レートの更新レートの数値とを提供するステップと、
前記IIP2の推定器の前記適応レート係数、前記受信器のミキサで生じる二次相互変調歪を含む受信信号、および前記送信器からのライブ送信信号を用いて最適化アルゴリズムを実施し、前記ミキサに生じた二次相互変調歪に比例するIIP2係数の推定値を推定するステップと、
前記IIP2コントローラの前記更新レートと前記IIP2係数の前記推定値とを用いて、前記ミキサの調整電圧を変更する前記最適化アルゴリズムを実施するステップと、
前記受信器の受信信号強度指示及び送信器の電力出力レベルの少なくとも一方の変化が発生する期間だけ待機するステップと、
前記待機するステップの後に、IIP2の前記適応レート係数及びIIP2コントローラの前記更新レートの少なくとも一方の変化が発生したかどうかを判定するステップと、
前記受信器の受信信号強度指示及び前記送信器の電力出力レベルの少なくとも一方に基づいて、前記IIP2推定器の前記適応レート係数及び前記IIP2コントローラの前記更新レートの少なくとも一方の変化が必要かどうかを判定するステップと、
このような変化が必要な場合、ルックアップテーブルに基づいて、前記IIP2推定器の前記適応レート係数及び前記IIP2コントローラの前記更新レートの少なくとも一方を変更させるステップとを備える、方法。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/248,421 US8060043B2 (en) | 2008-10-09 | 2008-10-09 | Adaptive IIP2 calibration |
US12/248,421 | 2008-10-09 | ||
PCT/US2009/056881 WO2010042295A2 (en) | 2008-10-09 | 2009-09-15 | Adaptive iip2 calibration |
Publications (3)
Publication Number | Publication Date |
---|---|
JP2012505595A JP2012505595A (ja) | 2012-03-01 |
JP2012505595A5 JP2012505595A5 (ja) | 2012-11-08 |
JP5627023B2 true JP5627023B2 (ja) | 2014-11-19 |
Family
ID=42099309
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2011531051A Expired - Fee Related JP5627023B2 (ja) | 2008-10-09 | 2009-09-15 | 適応iip2校正 |
Country Status (5)
Country | Link |
---|---|
US (2) | US8060043B2 (ja) |
JP (1) | JP5627023B2 (ja) |
CN (1) | CN102217202B (ja) |
TW (1) | TWI479810B (ja) |
WO (1) | WO2010042295A2 (ja) |
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-
2008
- 2008-10-09 US US12/248,421 patent/US8060043B2/en not_active Expired - Fee Related
-
2009
- 2009-09-15 JP JP2011531051A patent/JP5627023B2/ja not_active Expired - Fee Related
- 2009-09-15 CN CN200980144991.8A patent/CN102217202B/zh not_active Expired - Fee Related
- 2009-09-15 WO PCT/US2009/056881 patent/WO2010042295A2/en active Application Filing
- 2009-10-05 TW TW098133745A patent/TWI479810B/zh not_active IP Right Cessation
-
2011
- 2011-09-27 US US13/246,538 patent/US8150350B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
TWI479810B (zh) | 2015-04-01 |
CN102217202A (zh) | 2011-10-12 |
CN102217202B (zh) | 2014-02-05 |
JP2012505595A (ja) | 2012-03-01 |
US8060043B2 (en) | 2011-11-15 |
WO2010042295A2 (en) | 2010-04-15 |
TW201106641A (en) | 2011-02-16 |
WO2010042295A3 (en) | 2010-06-17 |
US8150350B2 (en) | 2012-04-03 |
US20100093298A1 (en) | 2010-04-15 |
US20120015616A1 (en) | 2012-01-19 |
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