JP4495210B2 - 振幅誤差補償装置及び直交度誤差補償装置 - Google Patents
振幅誤差補償装置及び直交度誤差補償装置 Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/38—Demodulator circuits; Receiver circuits
- H04L27/3845—Demodulator circuits; Receiver circuits using non - coherent demodulation, i.e. not using a phase synchronous carrier
- H04L27/3854—Demodulator circuits; Receiver circuits using non - coherent demodulation, i.e. not using a phase synchronous carrier using a non - coherent carrier, including systems with baseband correction for phase or frequency offset
- H04L27/3863—Compensation for quadrature error in the received signal
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Description
図1は、本発明の第1の実施形態に係る復調装置のブロック図である。図1の復調装置は、アナログ部2と、デジタル部4とを備えている。アナログ部2は、増幅部11と、アナログ直交検波部12とを備えている。デジタル部4は、振幅・直交度誤差補償部15と、検波部16と、識別部17とを備えている。
∫[0→2π] R2(sin2θ+cos2θ)dθ/2π=R2 …(1)
により求められる。ここで、∫[0→2π] dθは、θ=0からθ=2πまでの積分を表す。
∫[0→2π] (A2sin2θ+B2cos2θ)dθ/2π=(A2+B2)/2 …(2)
により求められる。
A2+B2=2R2 …(3)
が得られる。
αA=R …(4)
βB=R …(5)
の関係がある。
β=1/sqrt{2−(1/α)2} …(6)
となる。直交振幅誤差倍率算出部43は、式(6)の関係を用いて、同相振幅誤差倍率αから直交振幅誤差倍率βを算出する。直交振幅誤差倍率算出部43は、例えば、式(6)の関係を表すルックアップテーブルを記憶するROM(read-only memory)等によって実現することができる。
I’=Acos{(2π×Δf×t)+φ+θ(t)} …(7)
Q’=Asin{(2π×Δf×t)+φ+θ(t)+ψ} …(8)
ただし、
Δf:周波数オフセット[Hz]
φ :位相オフセット[rad], θ(t):位相情報[rad]
ψ :直交度誤差情報[rad], t:時間[s]
A :同相成分、直交成分の振幅
でそれぞれ表される。
Q”=I’×tanψ+Q’×1/cosψ …(9)
=Acosωt×tanψ+ Asin(ωt+ψ)×1/cosψ
=Acosωt×tanψ+{Asinωtcosψ−Acosωtsinψ}×1/cosψ
=Acosωt×tanψ+ Asinωt−Acosωt×tanψ
=Asinωt
となる。
図11は、本発明の第2の実施形態に係る振幅・直交度誤差補償部215の構成例を示すブロック図である。振幅・直交度誤差補償部215は、図1の復調装置において、振幅・直交度誤差補償部15に代えて用いられる。図11の振幅・直交度誤差補償部215は、図3の振幅・直交度誤差補償部15において、直交度誤差検出部50に代えて直交度誤差検出部250を備え、周波数オフセット検出器70を更に備えたものである。その他の構成要素については、第1の実施形態において説明したものと同様であるので、同一の参照番号を付してその説明を省略する。
I”=Acos{(2π×Δf×t)+φ+θ(t)} …(10)
Q”=Asin{(2π×Δf×t)+φ+θ(t)+ψ} …(11)
で表される。また、積和の公式より、同相成分I”と直交成分Q”との乗算結果は、式(10),(11)より、
I”*Q”
=Acos{(2π×Δf×t)+φ+θ(t)}
×Asin{(2π×Δf×t)+φ+θ(t)+ψ}
=A2/2×sin{(4π×Δf×t)+2φ+2θ(t)+ψ}
+A2/2×sin{ψ} …(12)
で表される。
∫[0→∞] I”*Q”dt
=∫[0→∞] A2/2×sin{(4π×Δf×t)+2φ+2θ(t)+ψ}dt
+∫[0→∞] A2/2×sin{ψ}dt …(13)
となる。周波数オフセットΔfがある場合、式(13)の第1項は0になるので、第2項の直交度誤差成分のみを検出することができる。
図13は、本発明の第3の実施形態に係る振幅・直交度誤差補償部315の構成例を示すブロック図である。振幅・直交度誤差補償部315は、図1の復調装置において、振幅・直交度誤差補償部15に代えて用いられる。図13の振幅・直交度誤差補償部315は、図3の振幅・直交度誤差補償部15において、振幅誤差検出部30及び直交度誤差検出部50に代えて、振幅誤差検出部330及び直交度誤差検出部350をそれぞれ備えたものである。その他の構成要素については、第1の実施形態において説明したものと同様であるので、同一の参照番号を付してその説明を省略する。
30,330 振幅誤差検出部
31 電力差分算出部
33,53 回転検出部
34,54,254 誤差情報制御部
35,55,255,335,355 ローパスフィルタ(平滑化部)
40 振幅補正部
50,250,350 直交度誤差検出部
51,331,339,351,359 電力計算部
52,332,352 符号決定部
56,356 象限判定部
60 直交度補正部
70 周波数オフセット検出器
251 乗算器
336 領域判定部
337,357 平均化部
338,358 差分器
Claims (4)
- 直交検波されて得られた複素信号の同相成分と直交成分とに対して、振幅誤差情報に基づいて振幅補正を行い、得られた振幅補正後の複素信号を出力する振幅補正部と、
前記振幅補正後の複素信号の同相成分の振幅と直交成分の振幅とに応じて前記振幅誤差情報を求める振幅誤差検出部とを備え、
前記振幅誤差検出部は、
前記振幅補正後の複素信号の同相成分と直交成分との間の電力の差を電力誤差として求める電力差分算出部と、
前記振幅補正後の複素信号の信号点の回転を検出し、その結果を回転検出信号として出力する回転検出部と、
前記信号点の回転が検出されたことを前記回転検出信号が示す場合には、前記電力誤差を出力し、前記信号点の回転が検出されなかったことを前記回転検出信号が示す場合には、0を出力する誤差情報制御部と、
前記誤差情報制御部の出力を平滑化し、前記振幅誤差情報として出力する平滑化部とを備えるものである
振幅誤差補償装置。 - 請求項1に記載の振幅誤差補償装置において、
前記振幅補正部は、
前記直交検波されて得られた複素信号の電力と前記振幅補正後の複素信号の電力とが等しくなるように、前記振幅補正を行うものである
ことを特徴とする振幅誤差補償装置。 - 請求項2に記載の振幅誤差補償装置において、
前記振幅補正部は、
前記直交検波されて得られた複素信号の同相成分及び直交成分のうち、一方に前記振幅誤差情報を乗じ、他方に前記振幅誤差情報を所定の関係に従って変換して得られた値を乗じて、前記振幅補正を行うものである
ことを特徴とする振幅誤差補償装置。 - 直交検波されて得られた複素信号に対して、直交度誤差情報に基づいて直交度補正を行い、得られた直交度補正後の複素信号を出力する直交度補正部と、
前記直交度補正後の複素信号の同相成分と直交成分との間の直交度誤差を求めて、前記直交度誤差情報として出力する直交度誤差検出部とを備え、
前記直交度誤差検出部は、
前記直交度補正後の複素信号の電力を求める電力計算部と、
前記直交度補正後の複素信号の信号点が、I−Q平面上におけるいずれの象限に属するかを判定し、その結果を象限判定信号として出力する象限判定部と、
前記象限判定信号に従って、前記電力又は符号を反転した前記電力の値を電力誤差として出力する符号決定部と、
前記直交度補正後の複素信号の信号点の回転を検出し、その結果を回転検出信号として出力する回転検出部と、
前記信号点の回転が検出されたことを前記回転検出信号が示す場合には、前記電力誤差を出力し、前記信号点の回転が検出されないことを前記回転検出信号が示す場合には、0を出力する誤差情報制御部と、
前記誤差情報制御部の出力を平滑化し、前記直交度誤差情報として出力する平滑化部とを備えるものである
直交度誤差補償装置。
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Cited By (2)
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|---|---|---|---|---|
| WO2012124586A1 (ja) | 2011-03-14 | 2012-09-20 | 古河電気工業株式会社 | 直交復調装置 |
| JP2013185945A (ja) * | 2012-03-07 | 2013-09-19 | Furukawa Electric Co Ltd:The | レーダ装置およびレーダ装置の調整方法 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012124586A1 (ja) | 2011-03-14 | 2012-09-20 | 古河電気工業株式会社 | 直交復調装置 |
| JP5950903B2 (ja) * | 2011-03-14 | 2016-07-13 | 古河電気工業株式会社 | 直交復調装置 |
| JP2013185945A (ja) * | 2012-03-07 | 2013-09-19 | Furukawa Electric Co Ltd:The | レーダ装置およびレーダ装置の調整方法 |
Also Published As
| Publication number | Publication date |
|---|---|
| US20080030264A1 (en) | 2008-02-07 |
| JPWO2006132118A1 (ja) | 2009-01-08 |
| US7456683B2 (en) | 2008-11-25 |
| JP2010136399A (ja) | 2010-06-17 |
| WO2006132118A1 (ja) | 2006-12-14 |
| EP1777906A1 (en) | 2007-04-25 |
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