WO2010071161A1 - 受信装置及びシンボルタイミング検出方法 - Google Patents
受信装置及びシンボルタイミング検出方法 Download PDFInfo
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- WO2010071161A1 WO2010071161A1 PCT/JP2009/071003 JP2009071003W WO2010071161A1 WO 2010071161 A1 WO2010071161 A1 WO 2010071161A1 JP 2009071003 W JP2009071003 W JP 2009071003W WO 2010071161 A1 WO2010071161 A1 WO 2010071161A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2662—Symbol synchronisation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2668—Details of algorithms
- H04L27/2673—Details of algorithms characterised by synchronisation parameters
- H04L27/2675—Pilot or known symbols
Definitions
- the present invention relates to a receiving apparatus and a symbol timing detection method for detecting the symbol timing of a multicarrier signal including a preamble portion in which known symbols are repeated.
- the window function processing unit 2 performs window function processing on the received signal using a predetermined window function.
- the received signal subjected to the window function processing gradually increases in amplitude and changes in a spiral shape from the 0th sample to the 31st sample in the center. Then, as shown by the white dots in FIG. 5B, the center 32 sample starts to decrease, and the amplitude gradually decreases and changes spirally.
- the imaginary number component of the received signal has symmetry as shown in FIG. 5B and cancels when the FFT size is added, and the added value becomes almost zero. Maintains orthogonality.
- the real number component does not have symmetry as shown in FIG. 5B, even if the FFT size is added, the added value does not become 0 and the orthogonality is broken.
- Received signal s'k obtained by the equation (15), since the term of w k is not present, the received signal s'k of the FFT size of the respect to the origin as shown in FIG. 5 (a) Arranged point-symmetrically. As a result, the received signal s ′ k can maintain orthogonality by this window function processing.
- the timing detection unit 3 obtains the correlation peak period of each received signal output from the window function processing units 201 to 203, and based on the correlation peak of the received signal whose correlation peak period is closest to the STS period, Detect the symbol timing of the signal.
- the timing detection unit 3 includes three correlators 311 to 313 corresponding to the window function processing units 201 to 203, peak detection units 321 to 323, and peak counters 351 to 353.
- the timing detection unit 3 includes a threshold value storage unit 33 and a timing determination unit 34.
- the peak counters 351 to 353 count the number of samples at the peak interval of the correlation peak detected by the peak detectors 321 to 323, respectively.
- FIGS. 7A to 7D are graphs showing calculation results of correlation values by the correlator.
- FIG. 7A is a graph showing STS time-axis waveform patterns for received signals not subjected to window function processing.
- (B) to (d) show correlation values calculated by the correlators 311 to 313 shown in FIG. 6, respectively.
- the vertical axis indicates the correlation value
- the horizontal axis indicates the time as the number of samples.
- the threshold value indicates the threshold value b.
- the timing determination unit 34 detects the time point when the correlator 311 first detects the correlation peak as the symbol timing. That is, the symbol timing has been successfully detected.
- FIG. 8 shows a block diagram of a receiving apparatus according to the third embodiment.
- FIG. 9 (a) to 9 (c) show the power spectrum of subcarriers used for generating the STS time axis waveform pattern.
- FIG. 9A shows subcarriers used for generating a conventional STS time axis waveform pattern
- FIG. 9B shows an STS time axis waveform pattern stored in the known symbol storage unit 41
- FIG. 9C shows the subcarriers used for generating the STS time axis waveform pattern stored in the known symbol storage unit 42.
- the known symbol storage unit 41 has subbands in a total of 6 both-end frequency bands, 3 from the left and 3 from the right of the 12 subcarriers in FIG. 9 (a).
- An STS time axis waveform pattern generated using a carrier is stored in advance.
- the known symbol storage unit 42 uses the six sub-carriers in the fourth to ninth center frequency bands from the left of the twelve sub-carriers in FIG. 9 (a).
- the STS time axis waveform pattern generated in advance is stored in advance.
- correlators 311 to 313 obtain correlation values between the received signals output from window function processing sections 201 to 203 and the STS time axis waveform pattern stored in known symbol storage section 41, respectively. .
- the peak counters 351 to 356 count the number of samples at the peak interval of the correlation peak detected by the peak detectors 321 to 323, respectively.
- the correlation value Rxx (l) between the STS time axis waveform pattern of the equation (22) in which the interference wave am k is not placed and the received signal s ′ k + am k including the interference wave am k is expressed by the equation (24).
- the correlators 314 to 316 shown in FIG. 8 can obtain the correlation values with higher accuracy than the correlators 311 to 313.
- the correlation results in the second to second rows in the second column indicate the correlation results by the correlators 314 to 316 shown in FIG. 8, respectively.
- the correlation results indicate the correlation results obtained by the correlators 311 to 313 shown in FIG.
- the receiving apparatus for the received signal that has been subjected to the window function processing by the three window functions each having a different number of samples, the STS time axis waveform pattern in the central frequency band, Since the correlation value with the STS time axis waveform pattern of the frequency bands at both ends is obtained, and the symbol timing is detected using the correlation value with which the peak interval can be detected most accurately among these correlation values, the symbol timing is It is possible to detect with higher accuracy.
- a time axis waveform pattern may be generated by combining subcarriers having different frequencies.
- each window function processing unit may be set to a different value that is an integral multiple of one cycle of STS.
- a window function processing unit that performs window function processing on a received signal using a window function having a short finite interval, and a correlation between the received signal subjected to the window function processing by the window function processing unit and the time axis waveform pattern of the known symbol
- a timing detection unit that obtains a peak and detects a symbol timing of the multicarrier signal based on the correlation peak, and the window function processing unit extracts a left half section or a right half section of the window function Based on the extracted window function, the left interval window function that is the window function of the left half interval and the right interval window function that is the window function of the right half interval are
- a window function generation unit configured to generate the left interval window starting from a predetermined reference time, the reference period, a finite interval of the left interval window function, and a time of a received signal retroactive to the past.
- a first processing signal is generated by multiplying the received signal by a time series with a function, and the right window function is used as the received signal starting from the time of the received signal that is backed by the right half of the reference time.
- a processing signal generation unit that multiplies the time-series signal to generate a second processing signal, and a signal obtained by adding the first processing signal and the second processing signal in time series to the past from the reference time point.
- an output unit that outputs the received signal up to a finite interval before the right interval window function to the timing detection unit.
- a window function generation step a reference period from a predetermined reference time point, a finite interval of the left interval window function from a time point retroactive to the past, and a reception signal time point retroactive to the past.
- the received signal is multiplied by a time series to generate a first processing signal, and the right section starts from a finite section of the right section window function from the reference time, the time of the received signal going back in the past.
- a processing signal generation step of generating a second processing signal by multiplying the received signal by time series with a window function, and a signal obtained by adding the first processing signal and the second processing signal in time series to the reference And an output step of outputting the received signal from the time point to the past as a reception signal before the finite interval of the right interval window function.
- the orthogonality of the received signal can be maintained and the interference wave contained in the received signal can be suppressed, the symbol timing can be detected with high accuracy.
- the window function generation unit extracts the window function of the left half section, generates the extracted window function as the left section window function, and subtracts the left section window function from 1 to reduce the right section window. It is preferable to generate a function.
- the window function of the left half section is extracted, the extracted window function is generated as the left section window function, and the right section window function is generated by the 1-left section window function. Therefore, it is possible to generate a left section window function and a right section window function having the same finite section by a simple process.
- each window function processing unit has a different reference period
- the timing detection unit calculates a correlation peak of each received signal output from each window function processing unit. It is preferable to obtain a peak period and detect the symbol timing of the multicarrier signal based on the correlation peak of the received signal whose peak period is closest to the period of the known symbol.
- the correlation peak is obtained using a plurality of time-axis waveform patterns of known symbols having different frequency bands. Therefore, it is possible to obtain a correlation peak using a time axis waveform pattern in a frequency band in which no disturbing wave is placed, and by detecting a symbol timing using the correlation peak obtained using this time axis waveform pattern. The symbol timing can be detected with higher accuracy.
- the symbol timing can be detected with high accuracy.
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Abstract
Description
以下、本発明の実施の形態1による受信装置について説明する。図1は、本発明の実施の形態1による受信装置のブロック図を示している。図1に示す受信装置は、例えばIEEE802.11a規格の受信装置であり、周波数軸上で直交関係を有する狭帯域の複数のサブキャリアをデジタル変調して多重化するマルチキャリア信号を受信する受信装置である。
本発明の実施の形態2の受信装置は、基準期間がそれぞれ異なる複数の窓関数処理部2を設けたことを特徴とする。なお、本実施の形態において、実施の形態1と同一のものは説明を省く。
実施の形態3による受信装置は、実施の形態2の受信装置に対して、既知シンボル記憶部を2つ設けたことを特徴とする。図8は、実施の形態3による受信装置のブロック図を示している。
Claims (7)
- 既知シンボルが繰り返されたプリアンブル部を含むマルチキャリア信号のシンボルタイミングを検出する受信装置であって、
前記既知シンボルの周期の整数倍の基準期間より短い有限区間を有する窓関数を用いて、受信信号に窓関数処理を行う窓関数処理部と、
前記窓関数処理部により窓関数処理された受信信号と前記既知シンボルの時間軸波形パターンとの相関ピークを求め、当該相関ピークを基に、前記マルチキャリア信号のシンボルタイミングを検出するタイミング検出部とを備え、
前記窓関数処理部は、
前記窓関数の左半分の区間又は右半分の区間を取り出し、取り出した窓関数を基に、左区間窓関数と右区間窓関数とを生成する窓関数生成部と、
所定の基準時点から前記基準期間、過去に遡った時点より、更に前記左区間窓関数の有限区間、過去に遡った受信信号の時点を起点として、前記左区間窓関数を前記受信信号に時系列に乗じて第1の処理信号を生成すると共に、前記基準時点より前記右区間窓関数の有限区間、過去に遡った前記受信信号の時点を起点として、前記右区間窓関数を前記受信信号に時系列に乗じて第2の処理信号を生成する処理信号生成部と、
前記第1の処理信号と前記第2の処理信号とを時系列に加算した信号を前記基準時点から過去に遡って前記右区間窓関数の有限区間前までの受信信号として前記タイミング検出部に出力する出力部とを備えることを特徴とする受信装置。 - 前記窓関数生成部は、前記左半分の区間の窓関数を取り出し、取り出した窓関数を前記左区間窓関数として生成し、1から前記左区間窓関数を減じることで前記右区間窓関数を生成することを特徴とする請求項1記載の受信装置。
- 前記窓関数生成部は、前記右半分の区間の窓関数を取り出し、取り出した窓関数を前記右区間窓関数として生成し、1から前記右区間窓関数を減じることで前記左区間窓関数を生成することを特徴とする請求項1記載の受信装置。
- 前記窓関数処理部は、複数存在し、
各窓関数処理部は、前記基準期間がそれぞれ異なり、
前記タイミング検出部は、各窓関数処理部から出力された各受信信号の相関ピークのピーク周期を求め、前記ピーク周期が前記既知シンボルの周期に最も近い受信信号の相関ピークを基に、前記マルチキャリア信号のシンボルタイミングを検出することを特徴とする請求項1~3のいずれかに記載の受信装置。 - 前記既知シンボルの生成に用いられる複数のサブキャリアを組み合わせることで予め生成された周波数帯域の異なる複数種類の時間軸波形パターンを記憶する既知シンボル記憶部を更に備え、
前記タイミング検出部は、前記窓関数処理部から出力された受信信号と各時間軸波形パターンとの相関ピークのピーク周期を求め、前記ピーク周期が前記既知シンボルの周期に最も近い時間軸波形パターンによる前記受信信号の相関ピークを基に、前記マルチキャリア信号のシンボルタイミングを検出することを特徴とする請求項1~4のいずれかに記載の受信装置。 - 前記タイミング検出部は、レベルが所定の範囲内の相関値を相関ピークとして検出し、当該相関ピークを用いて前記ピーク周期を求めることを特徴とする請求項1~5のいずれかに記載の受信装置。
- 既知シンボルが繰り返されたプリアンブル部を含むマルチキャリア信号のシンボルタイ
ミングを検出するシンボルタイミング検出方法であって、
前記既知シンボルの周期の整数倍の基準期間よりも短い有限区間を有する窓関数を用いて、受信信号に窓関数処理を行う窓関数処理ステップと、
前記窓関数処理ステップにより処理された受信信号と前記既知シンボルの時間軸波形パターンとの相関ピークを求め、当該相関ピークを基に、前記マルチキャリア信号のシンボルタイミングを検出するタイミング検出ステップとを備え、
前記窓関数処理ステップは、
前記窓関数の左半分の区間又は右半分の区間を取り出し、取り出した窓関数を基に、左区間窓関数と右区間窓関数とを生成する窓関数生成ステップと、
所定の基準時点から前記基準期間、過去に遡った時点より、更に前記左区間窓関数の有限区間、過去に遡った受信信号の時点を起点として、前記左区間窓関数を前記受信信号に時系列に乗じて第1の処理信号を生成すると共に、前記基準時点より前記右区間窓関数の有限区間、過去に遡った前記受信信号の時点を起点として、前記右区間窓関数を前記受信信号に時系列に乗じて第2の処理信号を生成する処理信号生成ステップと、
前記第1の処理信号と前記第2の処理信号とを時系列に加算した信号を前記基準時点から過去に遡って前記右区間窓関数の有限区間前までの受信信号として出力する出力ステップとを備えることを特徴とするシンボルタイミング検出方法。
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JP2000022657A (ja) * | 1998-07-06 | 2000-01-21 | Jisedai Digital Television Hoso System Kenkyusho:Kk | 直交周波数分割多重方式受信装置 |
JP2006352314A (ja) * | 2005-06-14 | 2006-12-28 | Anritsu Corp | 遅延測定装置 |
JP2008236744A (ja) * | 2007-03-20 | 2008-10-02 | Fujitsu Ltd | プリアンブル検出及びicfo推定をする装置及び方法 |
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DE102004025109B4 (de) * | 2004-05-21 | 2007-05-03 | Infineon Technologies Ag | Vorrichtung und Verfahren zur Präambeldetektion und Rahmensynchronisation bei der Datenpaketübertragung |
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JP2000022657A (ja) * | 1998-07-06 | 2000-01-21 | Jisedai Digital Television Hoso System Kenkyusho:Kk | 直交周波数分割多重方式受信装置 |
JP2006352314A (ja) * | 2005-06-14 | 2006-12-28 | Anritsu Corp | 遅延測定装置 |
JP2008236744A (ja) * | 2007-03-20 | 2008-10-02 | Fujitsu Ltd | プリアンブル検出及びicfo推定をする装置及び方法 |
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