JP2013192107A5 - - Google Patents
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- JP2013192107A5 JP2013192107A5 JP2012057811A JP2012057811A JP2013192107A5 JP 2013192107 A5 JP2013192107 A5 JP 2013192107A5 JP 2012057811 A JP2012057811 A JP 2012057811A JP 2012057811 A JP2012057811 A JP 2012057811A JP 2013192107 A5 JP2013192107 A5 JP 2013192107A5
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- 230000005540 biological transmission Effects 0.000 claims 15
- 238000001914 filtration Methods 0.000 claims 11
- 238000009499 grossing Methods 0.000 claims 11
- 230000000875 corresponding Effects 0.000 claims 6
- 238000001514 detection method Methods 0.000 claims 6
- 238000001228 spectrum Methods 0.000 claims 2
- 230000002123 temporal effect Effects 0.000 claims 2
- 238000005070 sampling Methods 0.000 claims 1
- 230000001702 transmitter Effects 0.000 claims 1
Claims (14)
既知信号系列を供給する既知信号系列生成部と、
前記伝送シンボル毎に前記既知信号系列と前記受信信号との間の相互相関を計算して相互相関値の系列を得る相関演算部と、
前記相互相関値の系列から、当該受信装置で受信された複数の到来波にそれぞれ対応する複数の相関ピーク値の位置を前記伝送シンボル毎に検出する到来波検出部と、
前記複数の相関ピーク値の時間変動を検出する変動量検出部と、
前記相互相関値の系列に対してシンボル方向の平滑化フィルタリングを実行して推定遅延プロファイルを生成するフィルタ部と、
前記変動量検出部により検出された当該時間変動に応じて前記フィルタ部の平滑化フィルタリング特性を変化させるフィルタ制御部と、
前記推定遅延プロファイルに基づいて前記受信信号の歪みを補正する等化処理を実行する等化処理部と
を備えることを特徴とする等化装置。 An equalizer for correcting distortion of a received signal of a transmission symbol received by a receiver when a transmission symbol having a known signal sequence and an effective symbol including an information signal is continuously transmitted from the transmitter. And
A known signal sequence generator for supplying a known signal sequence;
A correlation calculation unit for calculating a cross-correlation between the known signal sequence and the received signal for each transmission symbol to obtain a sequence of cross-correlation values;
An incoming wave detector that detects, for each transmission symbol, a position of a plurality of correlation peak values respectively corresponding to a plurality of incoming waves received by the receiving device from the series of cross-correlation values;
A fluctuation amount detector for detecting temporal fluctuations of the plurality of correlation peak values;
A filter unit that performs smoothing filtering in the symbol direction on the cross-correlation value series to generate an estimated delay profile;
A filter control unit that changes a smoothing filtering characteristic of the filter unit according to the time variation detected by the variation amount detection unit;
An equalization apparatus comprising: an equalization processing unit that executes equalization processing for correcting distortion of the received signal based on the estimated delay profile.
前記相互相関値のそれぞれの位置に基づいて、前記相互相関値の系列に対して複数の区間を設定する区間設定部をさらに備え、
前記複数の区間は、前記複数の相関ピーク値のうちの少なくとも１つに対応する区間を含み、
前記フィルタ部は、前記区間毎に前記平滑化フィルタリングを実行する
ことを特徴とする等化装置。 The equalization device according to claim 1,
Based on each position prior SL-phase cross-correlation value further comprises a section setting unit for setting a plurality of sections with respect to sequence of the cross-correlation value,
The plurality of sections include a section corresponding to at least one of the plurality of correlation peak values,
The said filter part performs the said smoothing filtering for every said area, The equalization apparatus characterized by the above-mentioned.
前記フィルタ部により生成された推定遅延プロファイルから閾値未満の値を切り捨てる閾値処理を実行する閾値処理部と、
前記変動量検出部により検出された当該時間変動に応じて前記閾値を変化させる閾値設定部と
をさらに備え、
前記等化処理部は、前記閾値処理の実行後の当該推定遅延プロファイルに基づいて前記受信信号の歪みを補正する
ことを特徴とする等化装置。 The equalization apparatus according to any one of claims 1 to 3, wherein
A threshold processing unit that executes threshold processing for truncating a value less than the threshold from the estimated delay profile generated by the filter unit;
A threshold setting unit that changes the threshold according to the time variation detected by the variation detection unit;
The equalization apparatus, wherein the equalization processing unit corrects distortion of the received signal based on the estimated delay profile after the threshold processing is executed.
前記変動量検出部は、
前記複数の相関ピーク値の各々の瞬時電力または相関ピーク値を複数の伝送シンボル分保持する信号保持部と、
前記瞬時電力または前記相関ピーク値を前記複数の伝送シンボルに亘ってサンプリングし、当該サンプリングされた瞬時電力または相関ピーク値を直交変換して周波数スペクトルを生成する直交変換部と、
前記周波数スペクトルのエッジの周波数値を検出するエッジ検出部と
を含み、
前記フィルタ制御部は、前記エッジの周波数値に応じて前記平滑化フィルタリング特性を変化させる
ことを特徴とする等化装置。 The equalization apparatus according to any one of claims 1 to 3, wherein
The fluctuation amount detection unit
A signal holding unit that holds the instantaneous power or the correlation peak value of each of the plurality of correlation peak values for a plurality of transmission symbols;
An orthogonal transform unit that samples the instantaneous power or the correlation peak value over the plurality of transmission symbols and orthogonally transforms the sampled instantaneous power or the correlation peak value to generate a frequency spectrum;
An edge detector for detecting a frequency value of an edge of the frequency spectrum,
The said filter control part changes the said smoothing filtering characteristic according to the frequency value of the said edge, The equalization apparatus characterized by the above-mentioned.
前記フィルタ部により生成された推定遅延プロファイルから閾値未満の値を切り捨てる閾値処理を実行する閾値処理部と、
前記閾値を前記エッジの周波数値に応じた値に設定する閾値設定部と
をさらに備え、
前記閾値設定部は、前記エッジの周波数値が小さい程、前記閾値を小さくし、
前記等化処理部は、前記閾値処理の実行後の当該推定遅延プロファイルに基づいて前記受信信号の歪みを補正する
ことを特徴とする等化装置。 The equalization apparatus according to claim 6, wherein
A threshold processing unit that executes threshold processing for truncating a value less than the threshold from the estimated delay profile generated by the filter unit;
A threshold setting unit that sets the threshold to a value corresponding to the frequency value of the edge;
The threshold value setting unit decreases the threshold value as the frequency value of the edge is smaller.
The equalization apparatus, wherein the equalization processing unit corrects distortion of the received signal based on the estimated delay profile after the threshold processing is executed.
前記変動量検出部は、
前記複数の到来波の各々に対応する当該相関ピーク値または当該相関ピーク値の瞬時電力を複数の伝送シンボル分保持する信号保持部と、
前記信号保持部に保持されている当該瞬時電力または当該相関ピーク値の時間変動量を検出する時間変動量算出部と
を含み、
前記フィルタ制御部は、前記時間変動量に応じて前記平滑化フィルタリング特性を変化させる
ことを特徴とする等化装置。 The equalization apparatus according to any one of claims 1 to 3, wherein
The fluctuation amount detection unit
A signal holding unit for holding the correlation peak value corresponding to each of the plurality of incoming waves or the instantaneous power of the correlation peak value for a plurality of transmission symbols;
A time fluctuation amount calculating unit that detects a time fluctuation amount of the instantaneous power or the correlation peak value held in the signal holding unit,
The said filter control part changes the said smoothing filtering characteristic according to the said amount of time fluctuations, The equalization apparatus characterized by the above-mentioned.
前記変動量検出部の出力に基づいて最大ドップラー周波数を算出するドップラー周波数算出部をさらに備え、
前記変動量検出部は、
前記複数の到来波の各々に対応する当該相関ピーク値または当該相関ピーク値の瞬時電力を複数の伝送シンボル分保持する信号保持部と、
前記信号保持部に保持されている当該瞬時電力または当該相関ピーク値の時間変動量を検出する時間変動量算出部と
を含み、
前記ドップラー周波数算出部は、前記時間変動量に基づいて前記最大ドップラー周波数を算出し、
前記フィルタ制御部は、前記最大ドップラー周波数に応じて前記平滑化フィルタリング特性を変化させる
ことを特徴とする等化装置。 The equalization apparatus according to any one of claims 1 to 3, wherein
Further comprising a Doppler frequency calculation unit for calculating a maximum Doppler frequency based on the output of the fluctuation amount detection unit;
The fluctuation amount detection unit
A signal holding unit for holding the correlation peak value corresponding to each of the plurality of incoming waves or the instantaneous power of the correlation peak value for a plurality of transmission symbols;
A time fluctuation amount calculating unit that detects a time fluctuation amount of the instantaneous power or the correlation peak value held in the signal holding unit,
The Doppler frequency calculation unit calculates the maximum Doppler frequency based on the amount of time variation,
The equalizing apparatus, wherein the filter control unit changes the smoothing filtering characteristic according to the maximum Doppler frequency.
前記フィルタ部により生成された推定遅延プロファイルから閾値未満の値を切り捨てる閾値処理を実行する閾値処理部と、
前記閾値を前記時間変動量に応じた値に設定する閾値設定部と
をさらに備え、
前記閾値設定部は、前記時間変動量が小さい程、前記閾値を小さくし、
前記等化処理部は、前記閾値処理の実行後の当該推定遅延プロファイルに基づいて前記受信信号の歪みを補正する
ことを特徴とする等化装置。 The equalization device according to claim 10, wherein
A threshold processing unit that executes threshold processing for truncating a value less than the threshold from the estimated delay profile generated by the filter unit;
A threshold setting unit that sets the threshold to a value according to the amount of time variation,
The threshold value setting unit decreases the threshold value as the time variation amount decreases.
The equalization apparatus, wherein the equalization processing unit corrects distortion of the received signal based on the estimated delay profile after the threshold processing is executed.
前記フィルタ部は、可変フィルタ係数群を有するデジタルフィルタであり、
前記フィルタ制御部は、前記可変フィルタ係数群の値を更新することで前記平滑化フィルタリング特性を変化させる
ことを特徴とする等化装置。 The equalizer according to any one of claims 1 to 11, comprising:
The filter unit is a digital filter having a variable filter coefficient group,
The said filter control part changes the said smoothing filtering characteristic by updating the value of the said variable filter coefficient group, The equalization apparatus characterized by the above-mentioned.
前記信号受信部で受信された当該受信信号の歪みを補正する請求項１から１２のうちのいずれか１項に記載の等化装置と
を備えることを特徴とする受信装置。 A signal receiving unit that receives a signal of the transmission symbol when a transmission symbol having a known signal sequence and an effective symbol including an information signal is continuously transmitted from the transmission device;
A receiving apparatus comprising: the equalization apparatus according to claim 1, which corrects distortion of the received signal received by the signal receiving unit.
前記伝送シンボル毎に前記既知信号系列と前記受信信号との間の相互相関を計算して相互相関値の系列を得るステップと、
前記相互相関値の系列から、当該受信装置で受信された複数の到来波にそれぞれ対応する複数の相関ピーク値の位置を前記伝送シンボル毎に検出するステップと、
前記複数の相関ピーク値の時間変動を検出するステップと、
前記相互相関値の系列に対してシンボル方向の平滑化フィルタリングを実行して推定遅延プロファイルを生成するステップと、
当該検出された時間変動に応じて前記平滑化フィルタリングの特性を変化させるステップと、
前記推定遅延プロファイルに基づいて前記受信信号の歪みを補正するステップと
を備えることを特徴とする等化方法。 This is an equalization method for correcting distortion of a received signal of a transmission symbol received by a receiving device when a transmission symbol having a known signal sequence and an effective symbol including an information signal is continuously transmitted from the transmitting device. And
Calculating a cross-correlation between the known signal sequence and the received signal for each transmission symbol to obtain a sequence of cross-correlation values;
Detecting a position of a plurality of correlation peak values respectively corresponding to a plurality of incoming waves received by the receiving device from the cross-correlation value sequence for each transmission symbol;
Detecting time variations of the plurality of correlation peak values;
Performing a smoothing filtering in the symbol direction on the sequence of cross-correlation values to generate an estimated delay profile;
Changing the characteristics of the smoothing filtering according to the detected temporal variation;
And a step of correcting distortion of the received signal based on the estimated delay profile.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012057811A JP5896795B2 (en) | 2012-03-14 | 2012-03-14 | Equalizer, receiver, and equalization method |
| CN201210557407.5A CN103312643B (en) | 2012-03-14 | 2012-12-20 | Balancer, receiving system and equalization methods |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012057811A JP5896795B2 (en) | 2012-03-14 | 2012-03-14 | Equalizer, receiver, and equalization method |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JP2013192107A JP2013192107A (en) | 2013-09-26 |
| JP2013192107A5 true JP2013192107A5 (en) | 2015-02-12 |
| JP5896795B2 JP5896795B2 (en) | 2016-03-30 |
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| JP2012057811A Expired - Fee Related JP5896795B2 (en) | 2012-03-14 | 2012-03-14 | Equalizer, receiver, and equalization method |
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| JP (1) | JP5896795B2 (en) |
| CN (1) | CN103312643B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5710534B2 (en) * | 2012-03-27 | 2015-04-30 | 株式会社東芝 | Frequency domain equalizer and receiver |
| JP5995703B2 (en) * | 2012-12-19 | 2016-09-21 | 三菱電機株式会社 | Equalizer, equalization method, and receiver |
| JP6198665B2 (en) | 2013-07-05 | 2017-09-20 | 三菱電機株式会社 | Receiving apparatus and receiving method |
| JP6293011B2 (en) * | 2013-11-21 | 2018-03-14 | 三菱電機株式会社 | Equalizer, equalization method, and receiver |
| US9929758B2 (en) | 2015-07-27 | 2018-03-27 | Futurewei Technologies, Inc. | Reducing receiver distortion caused by transmitter signals |
| CN111953624A (en) * | 2019-05-17 | 2020-11-17 | 中兴通讯股份有限公司 | Echo time delay estimation method and device |
| CN113381958B (en) * | 2020-02-25 | 2022-07-08 | 大唐移动通信设备有限公司 | Method and device for adjusting self-adaptive peak threshold |
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|---|---|---|---|---|
| JPH1051356A (en) * | 1996-03-29 | 1998-02-20 | Matsushita Electric Ind Co Ltd | Doppler frequency measurement circuit and synchronization circuit |
| US5903596A (en) * | 1996-05-16 | 1999-05-11 | Nakano; Takayuki | Spread spectrum demodulation unit |
| JP3146196B2 (en) * | 1999-03-17 | 2001-03-12 | 株式会社次世代デジタルテレビジョン放送システム研究所 | OFDM demodulator |
| JP2001251216A (en) * | 2000-03-06 | 2001-09-14 | Oki Electric Ind Co Ltd | Circuit and method for capturing synchronization |
| JP2002094412A (en) * | 2000-09-14 | 2002-03-29 | Matsushita Electric Ind Co Ltd | Cdma receiving device and method for processing reception |
| JP2002111549A (en) * | 2000-10-02 | 2002-04-12 | Canon Inc | Synchronizer |
| JP2002141885A (en) * | 2000-10-31 | 2002-05-17 | Mitsubishi Electric Corp | Ofdm receiver |
| JP2002261658A (en) * | 2001-03-02 | 2002-09-13 | Matsushita Electric Ind Co Ltd | Receiving apparatus and pass selection method |
| JP4165238B2 (en) * | 2003-01-29 | 2008-10-15 | 日本電気株式会社 | Path search circuit, method and program |
| JP4816353B2 (en) * | 2006-09-12 | 2011-11-16 | ソニー株式会社 | OFDM receiving apparatus and OFDM signal receiving method |
| CN101232480B (en) * | 2006-10-05 | 2012-09-05 | 马维尔国际贸易有限公司 | Method and device for regulating frequency offset |
| JP5042118B2 (en) * | 2008-05-20 | 2012-10-03 | 三菱電機株式会社 | Transmission path estimation apparatus and method |
| JP5338409B2 (en) * | 2009-03-19 | 2013-11-13 | 三菱電機株式会社 | Delay profile estimation device and image display device |
| JP4975085B2 (en) * | 2009-11-09 | 2012-07-11 | 三菱電機株式会社 | Receiving apparatus and method |
| JP2011199391A (en) * | 2010-03-17 | 2011-10-06 | Toshiba Corp | Response estimator of transmission line |
| JP4851637B1 (en) * | 2011-05-16 | 2012-01-11 | パナソニック株式会社 | Equalizer and equalization method |
-
2012
- 2012-03-14 JP JP2012057811A patent/JP5896795B2/en not_active Expired - Fee Related
- 2012-12-20 CN CN201210557407.5A patent/CN103312643B/en not_active Expired - Fee Related
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