JP2003298548A5 - - Google Patents

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JP2003298548A5
JP2003298548A5 JP2002098598A JP2002098598A JP2003298548A5 JP 2003298548 A5 JP2003298548 A5 JP 2003298548A5 JP 2002098598 A JP2002098598 A JP 2002098598A JP 2002098598 A JP2002098598 A JP 2002098598A JP 2003298548 A5 JP2003298548 A5 JP 2003298548A5
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subtractor
fft
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受信信号を同一の周波数で再送信する場合に発生する送受信アンテナ間の回り込みを除去する回り込みキャンセラであって、
入力信号から回り込み信号の複製を減じる減算器と、
前記減算器の出力にタップ係数を畳み込み、回り込み信号の複製を生成するＦＩＲ（Finite Impulse Response：有限インパルス応答）フィルタと、
前記減算器の出力を用いて、回り込みの伝送路特性を推定し、前記ＦＩＲフィルタの係数を生成するフィルタ係数生成部とを備え、
前記フィルタ係数生成部は、
時間領域の信号である前記減算器の出力を周波数領域の信号へと変換するＦＦＴ（Fast Fourier Transform：高速フーリエ変換）手段と、
前記ＦＦＴ手段の出力に含まれるパイロットキャリアを規定の振幅と位相を有するパイロット信号で除することにより、前記パイロットキャリアに対する伝送路特性を推定する第一の複素除算手段と、
前記第一の複素除算手段の出力を補間し、信号帯域全体に対する伝送路特性を推定する第一の補間手段と、
前記ＦＦＴ手段の出力を前記第一の補間手段の出力で除することにより、伝送路歪の影響を補償する第二の複素除算手段と、
前記第二の複素除算手段の出力を各々のキャリアの変調方式に応じた閾値群で弁別する判定手段と、
前記判定手段の出力を各々のキャリアに応じた変調方式で変調する変調手段と、
前記ＦＦＴ手段の出力を前記変調手段の出力で除することにより、信号帯域全体に対する伝送路特性を推定する第三の複素除算手段と、
前記第三の複素除算手段の出力を用いて、キャンセル残差を算出する残差算出手段と、
前記残差算出手段の出力を、時間領域の信号に変換するＩＦＦＴ（Inverse Fast Fourier Transform：逆高速フーリエ変換）手段と、
前記ＩＦＦＴ手段の出力から、前記ＦＩＲフィルタの係数を生成する係数更新手段とを備えることを特徴とする回り込みキャンセラ。A sneak canceller that removes sneak current between transmitting and receiving antennas that occurs when a received signal is retransmitted at the same frequency,
A subtractor that subtracts duplicates of the sneak signal from the input signal;
An FIR (Finite Impulse Response) filter that convolves a tap coefficient with the output of the subtractor to generate a duplicated wrap signal;
A filter coefficient generation unit that estimates a sneak path characteristic using the output of the subtractor and generates a coefficient of the FIR filter;
The filter coefficient generation unit
FFT (Fast Fourier Transform) means for converting the output of the subtractor, which is a time domain signal, into a frequency domain signal;
A first complex division means for estimating a channel characteristic for the pilot carrier by dividing a pilot carrier included in the output of the FFT means by a pilot signal having a prescribed amplitude and phase;
First interpolation means for interpolating the output of the first complex division means and estimating transmission line characteristics for the entire signal band;
Dividing the output of the FFT means by the output of the first interpolation means to compensate for the influence of transmission line distortion;
Determination means for discriminating the output of the second complex division means by a threshold group according to the modulation scheme of each carrier;
Modulating means for modulation by the modulation method corresponding output to each carrier of said determination means,
Dividing the output of the FFT means by the output of the modulation means to estimate a transmission line characteristic for the entire signal band;
Using the output of the third complex division means, residual calculation means for calculating a cancellation residual;
IFFT (Inverse Fast Fourier Transform) means for converting the output of the residual calculation means into a signal in the time domain;
Wherein the output of the IFFT unit, wraparound, characterized in that it comprises a coefficient updating means for generating the coefficients of the FIR filter canceller. 受信信号を同一の周波数で再送信する場合に発生する送受信アンテナ間の回り込みを除去する回り込みキャンセラであって、
入力信号から回り込み信号の複製を減じる減算器と、
前記減算器の出力にタップ係数を畳み込み、回り込み信号の複製を生成するＦＩＲ（Finite Impulse Response：有限インパルス応答）フィルタと、
前記減算器の出力を用いて、回り込みの伝送路特性を推定し、前記ＦＩＲフィルタの係数を生成するフィルタ係数生成部とを備え、
前記フィルタ係数生成部は、
時間領域の信号である前記減算器の出力を周波数領域の信号へと変換するＦＦＴ（Fast Fourier Transform：高速フーリエ変換）手段と、
前記ＦＦＴ手段の出力に含まれるパイロットキャリアを規定の振幅と位相を有するパイロット信号で除することにより、前記パイロットキャリアに対する伝送路特性を推定する第一の複素除算手段と、
前記第一の複素除算手段の出力を補間し、信号帯域全体に対する伝送路特性を推定する第一の補間手段と、
前記ＦＦＴ手段の出力を前記第一の補間手段の出力で除することにより、伝送路歪の影響を補償する第二の複素除算手段と、
前記第二の複素除算手段の出力を各々のキャリアの変調方式に応じた閾値群で弁別する判定手段と、
前記判定手段の出力を各々のキャリアに応じた変調方式で変調する変調手段と、
前記ＦＦＴ手段の出力を前記変調手段の出力で除することにより、信号帯域全体に対する伝送路特性を推定する第三の複素除算手段と、
パイロットキャリアに対しては、前記第一の複素除算手段の出力を選択し、他のキャリアに関しては前記第三の複素除算手段の出力を選択し、出力する選択手段と、
前記選択手段の出力を用いて、キャンセル残差を算出する残差算出手段と、
前記残差算出手段の出力を、時間領域の信号に変換するＩＦＦＴ（Inverse Fast Fourier Transform：逆高速フーリエ変換）手段と、
前記ＩＦＦＴ手段の出力から、前記ＦＩＲフィルタの係数を生成する係数更新手段とを備えることを特徴とする回り込みキャンセラ。A sneak canceller that removes sneak current between transmitting and receiving antennas that occurs when a received signal is retransmitted at the same frequency,
A subtractor that subtracts duplicates of the sneak signal from the input signal;
An FIR (Finite Impulse Response) filter that convolves a tap coefficient with the output of the subtractor to generate a duplicated wrap signal;
A filter coefficient generation unit that estimates a sneak path characteristic using the output of the subtractor and generates a coefficient of the FIR filter;
The filter coefficient generation unit
FFT (Fast Fourier Transform) means for converting the output of the subtractor, which is a time domain signal, into a frequency domain signal;
A first complex division means for estimating a channel characteristic for the pilot carrier by dividing a pilot carrier included in the output of the FFT means by a pilot signal having a prescribed amplitude and phase;
First interpolation means for interpolating the output of the first complex division means and estimating transmission line characteristics for the entire signal band;
Dividing the output of the FFT means by the output of the first interpolation means to compensate for the influence of transmission line distortion;
Determination means for discriminating the output of the second complex division means by a threshold group according to the modulation scheme of each carrier;
Modulating means for modulation by the modulation method corresponding output to each carrier of said determination means,
Dividing the output of the FFT means by the output of the modulation means to estimate a transmission line characteristic for the entire signal band;
Selecting means for selecting and outputting the output of the first complex division means for the pilot carrier, selecting the output of the third complex division means for the other carriers;
Residual calculation means for calculating a cancellation residual using the output of the selection means;
IFFT (Inverse Fast Fourier Transform) means for converting the output of the residual calculation means into a signal in the time domain;
Wherein the output of the IFFT unit, wraparound, characterized in that it comprises a coefficient updating means for generating the coefficients of the FIR filter canceller. 受信信号を同一の周波数で再送信する場合に発生する送受信アンテナ間の回り込みを除去する回り込みキャンセラであって、
入力信号から回り込み信号の複製を減じる減算器と、
前記減算器の出力にタップ係数を畳み込み、回り込み信号の複製を生成するＦＩＲ（Finite Impulse Response：有限インパルス応答）フィルタと、
前記減算器の出力を用いて、回り込みの伝送路特性を推定し、前記ＦＩＲフィルタの係数を生成するフィルタ係数生成部とを備え、
前記フィルタ係数生成部は、
時間領域の信号である前記減算器の出力を周波数領域の信号へと変換するＦＦＴ（Fast Fourier Transform：高速フーリエ変換）手段と、
前記ＦＦＴ手段の出力に含まれるパイロットキャリアを規定の振幅と位相を有するパイロット信号で除することにより、前記パイロットキャリアに対する伝送路特性を推定する第一の複素除算手段と、
前記第一の複素除算手段の出力を補間し、信号帯域全体に対する伝送路特性を推定する第一の補間手段と、
前記ＦＦＴ手段の出力を前記第一の補間手段の出力で除することにより、伝送路歪の影響を補償する第二の複素除算手段と、
前記第二の複素除算手段の出力を各々のキャリアの変調方式に応じた閾値群で弁別する判定手段と、
前記判定手段の出力を各々のキャリアに応じた変調方式で変調する変調手段と、
前記ＦＦＴ手段の出力を前記変調手段の出力で除することにより、信号帯域全体に対する伝送路特性を推定する第三の複素除算手段と、
前記第一の複素除算手段の出力を補間し、信号帯域全体に対する伝送路特性を推定する第二の補間手段と、
前記第三の複素除算手段が出力する伝送路特性の信頼性を算出する信頼性算出手段と、
前記信頼性算出手段の出力に応じて、前記第二の補間手段の出力と、前記第三の複素除算手段の出力とを重み付け加算して出力する合成手段と、
前記合成手段の出力を用いて、キャンセル残差を算出する残差算出手段と、
前記残差算出手段の出力を、時間領域の信号に変換するＩＦＦＴ（Inverse Fast Fourier Transform：逆高速フーリエ変換）手段と、
前記ＩＦＦＴ手段の出力から、前記ＦＩＲフィルタの係数を生成する係数更新手段を備えることを特徴とする回り込みキャンセラ。A sneak canceller that removes sneak current between transmitting and receiving antennas that occurs when a received signal is retransmitted at the same frequency,
A subtractor that subtracts duplicates of the sneak signal from the input signal;
An FIR (Finite Impulse Response) filter that convolves a tap coefficient with the output of the subtractor to generate a duplicated wrap signal;
A filter coefficient generation unit that estimates a sneak path characteristic using the output of the subtractor and generates a coefficient of the FIR filter;
The filter coefficient generation unit
FFT (Fast Fourier Transform) means for converting the output of the subtractor, which is a time domain signal, into a frequency domain signal;
A first complex division means for estimating a channel characteristic for the pilot carrier by dividing a pilot carrier included in the output of the FFT means by a pilot signal having a prescribed amplitude and phase;
First interpolation means for interpolating the output of the first complex division means and estimating transmission line characteristics for the entire signal band;
Dividing the output of the FFT means by the output of the first interpolation means to compensate for the influence of transmission line distortion;
Determination means for discriminating the output of the second complex division means by a threshold group according to the modulation scheme of each carrier;
Modulating means for modulation by the modulation method corresponding output to each carrier of said determination means,
Dividing the output of the FFT means by the output of the modulation means to estimate a transmission line characteristic for the entire signal band;
Second interpolation means for interpolating the output of the first complex division means and estimating transmission line characteristics for the entire signal band;
Reliability calculation means for calculating the reliability of the transmission path characteristics output by the third complex division means;
In accordance with the output of the reliability calculation means, a synthesis means for weighting and outputting the output of the second interpolation means and the output of the third complex division means, and
A residual calculating means for calculating a cancellation residual using the output of the combining means;
IFFT (Inverse Fast Fourier Transform) means for converting the output of the residual calculation means into a signal in the time domain;
A wraparound canceller comprising coefficient updating means for generating coefficients of the FIR filter from the output of the IFFT means. 受信信号を同一の周波数で再送信する場合に発生する送受信アンテナ間の回り込みを除去する回り込みキャンセラであって、
入力信号から回り込み信号の複製を減じる減算器と、
前記減算器の出力にタップ係数を畳み込み、回り込み信号の複製を生成するＦＩＲ（Finite Impulse Response：有限インパルス応答）フィルタと、
前記減算器の出力を用いて、回り込みの伝送路特性を推定し、前記ＦＩＲフィルタの係数を生成するフィルタ係数生成部とを備え、
前記フィルタ係数生成部は、
時間領域の信号である前記減算器の出力を周波数領域の信号へと変換するＦＦＴ（Fast Fourier Transform：高速フーリエ変換）手段と、
前記ＦＦＴ手段の出力に含まれるパイロットキャリアを規定の振幅と位相を有するパイロット信号で除することにより、前記パイロットキャリアに対する伝送路特性を推定する第一の複素除算手段と、
前記第一の複素除算手段の出力を補間し、信号帯域全体に対する伝送路特性を推定する第一の補間手段と、
前記ＦＦＴ手段の出力を前記第一の補間手段の出力で除することにより、伝送路歪の影響を補償する第二の複素除算手段と、
前記第二の複素除算手段の出力を各々のキャリアの変調方式に応じた閾値群で弁別する判定手段と、
前記判定手段の出力を各々のキャリアに応じた変調方式で変調する変調手段と、
前記ＦＦＴ手段の出力を前記変調手段の出力で除することにより、信号帯域全体に対する伝送路特性を推定する第三の複素除算手段と、
前記第一の複素除算手段の出力を補間し、信号帯域全体に対する伝送路特性を推定する第二の補間手段と、
前記第三の複素除算手段が出力する伝送路特性の信頼性を算出する信頼性算出手段と、
前記信頼性算出手段の出力に応じて、前記第二の補間手段の出力と、前記第三の複素除算手段の出力とを重み付け加算して出力する合成手段と、
前記合成手段の出力を平滑化する平滑化手段と、
前記平滑化手段の出力を用いて、キャンセル残差を算出する残差算出手段と、
前記残差算出手段の出力を、時間領域の信号に変換するＩＦＦＴ（Inverse Fast Fourier Transform：逆高速フーリエ変換）手段と、
前記ＩＦＦＴ手段の出力から、前記ＦＩＲフィルタの係数を生成する係数更新手段とを備えることを特徴とする回り込みキャンセラ。A sneak canceller that removes sneak current between transmitting and receiving antennas that occurs when a received signal is retransmitted at the same frequency,
A subtractor that subtracts duplicates of the sneak signal from the input signal;
An FIR (Finite Impulse Response) filter that convolves a tap coefficient with the output of the subtractor to generate a duplicated wrap signal;
A filter coefficient generation unit that estimates a sneak path characteristic using the output of the subtractor and generates a coefficient of the FIR filter;
The filter coefficient generation unit
FFT (Fast Fourier Transform) means for converting the output of the subtractor, which is a time domain signal, into a frequency domain signal;
A first complex division means for estimating a channel characteristic for the pilot carrier by dividing a pilot carrier included in the output of the FFT means by a pilot signal having a prescribed amplitude and phase;
First interpolation means for interpolating the output of the first complex division means and estimating transmission line characteristics for the entire signal band;
Dividing the output of the FFT means by the output of the first interpolation means to compensate for the influence of transmission line distortion;
Determination means for discriminating the output of the second complex division means by a threshold group according to the modulation scheme of each carrier;
Modulating means for modulation by the modulation method corresponding output to each carrier of said determination means,
Dividing the output of the FFT means by the output of the modulation means to estimate a transmission line characteristic for the entire signal band;
Second interpolation means for interpolating the output of the first complex division means and estimating transmission line characteristics for the entire signal band;
Reliability calculation means for calculating the reliability of the transmission path characteristics output by the third complex division means;
In accordance with the output of the reliability calculation means, a synthesis means for weighting and outputting the output of the second interpolation means and the output of the third complex division means, and
Smoothing means for smoothing the output of the combining means;
Residual calculation means for calculating a cancellation residual using the output of the smoothing means;
IFFT (Inverse Fast Fourier Transform) means for converting the output of the residual calculation means into a signal in the time domain;
Wherein the output of the IFFT unit, wraparound, characterized in that it comprises a coefficient updating means for generating the coefficients of the FIR filter canceller. 前記信頼性算出手段は、前記変調手段の出力と前記第二の複素乗算手段の出力との差分に基づき、前記第三の複素除算手段が出力する伝送路特性の信頼性を算出することを特徴とする請求項３または請求項４記載の回り込みキャンセラ。The reliability calculation means calculates the reliability of the transmission path characteristics output from the third complex division means based on the difference between the output of the modulation means and the output of the second complex multiplication means. The wraparound canceller according to claim 3 or 4 . 前記信頼性算出手段は、前記第一の補間手段の出力の大きさに基づき、前記第三の複素除算手段が出力する伝送路特性の信頼性を算出することを特徴とする請求項３または請求項４記載の回り込みキャンセラ。The reliability calculation means, based on said magnitude of the output of the first interpolation means, according to claim 3 or claim, characterized in that to calculate the reliability of the transmission line characteristics in which the third complex division means outputs Item 5. A wraparound canceller according to item 4 . 前記信頼性算出手段の出力が二値情報であり、前記信頼性算出手段の出力に応じて、前記第二の補間手段の出力と前記第三の複素除算手段の出力とを選択して出力する選択手段を、前記合成手段の代わりに備えることを特徴とする請求項３または請求項４記載の回り込みキャンセラ。The output of the reliability calculation means is binary information, and the output of the second interpolation means and the output of the third complex division means are selected and output according to the output of the reliability calculation means The wraparound canceller according to claim 3 or 4 , further comprising a selection unit instead of the combination unit.
JP2002098598A 2002-04-01 2002-04-01 Wraparound canceller Expired - Lifetime JP3975104B2 (en)

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JP4398752B2 (en) 2004-02-19 2010-01-13 株式会社エヌ・ティ・ティ・ドコモ Wireless relay system, wireless relay device, and wireless relay method
JP2007081504A (en) * 2005-09-12 2007-03-29 Hitachi Kokusai Electric Inc Transmission path characteristic interpolation method in ofdm receiver and apparatus thereof
JP2007201855A (en) * 2006-01-27 2007-08-09 Maspro Denkoh Corp Apparatus for retransmitting digital broadcast
JP4758236B2 (en) * 2006-01-27 2011-08-24 マスプロ電工株式会社 Digital broadcast retransmitting device wraparound monitoring method, monitoring program, and digital broadcast retransmitting device
JP4953782B2 (en) * 2006-11-30 2012-06-13 パナソニック株式会社 Rounding cancellation device
WO2010019017A2 (en) * 2008-08-14 2010-02-18 한국전자통신연구원 Self-interference cancellation method and relay apparatus using the same frequency band in ofdm-based radio communication system
US9876559B2 (en) 2015-03-11 2018-01-23 Industrial Technology Research Insitute Method for relaying signal and relay using the same

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