WO2014038072A1 - 送信機および送信方法 - Google Patents
送信機および送信方法 Download PDFInfo
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- WO2014038072A1 WO2014038072A1 PCT/JP2012/072959 JP2012072959W WO2014038072A1 WO 2014038072 A1 WO2014038072 A1 WO 2014038072A1 JP 2012072959 W JP2012072959 W JP 2012072959W WO 2014038072 A1 WO2014038072 A1 WO 2014038072A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
- H04L27/12—Modulator circuits; Transmitter circuits
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/24—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages
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- 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
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B1/0475—Circuits with means for limiting noise, interference or distortion
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L27/20—Modulator circuits; Transmitter circuits
-
- 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
- H04L27/2614—Peak power aspects
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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
- H04L27/2614—Peak power aspects
- H04L27/2621—Reduction thereof using phase offsets between subcarriers
-
- 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
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2627—Modulators
- H04L27/2644—Modulators with oversampling
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- 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
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B2001/0408—Circuits with power amplifiers
- H04B2001/045—Circuits with power amplifiers with means for improving efficiency
Definitions
- the present invention relates to a transmitter that generates a transmission signal by oversampling a constant envelope signal.
- PAPR Peak to Average Power Ratio
- the PAPR of the transmission signal is small. For this reason, for example, if the transmission signal is a constant envelope signal with a constant amplitude, the signal power is always constant, so the PAPR can be set to 0 dB.
- the transmitter is generally transmitted after oversampling the signal and performing the band limiting process.
- V ⁇ 1 0s are inserted between each sample of the signal, and the signal length is multiplied by V (V times oversampling).
- V V times oversampling
- a band limiting process is performed by a band limiting filter.
- a root roll-off filter is often used as the band limiting filter.
- band limiting when band limiting is performed after oversampling as described above, it is difficult to realize a constant envelope signal. Actually, it is easy to use the signal before the oversampling process as a constant envelope signal. However, if band limitation is performed after oversampling processing, out-of-band signals are removed, and as a result, the signal amplitude changes. That is, as shown in FIG. 12, the band-limited signal does not become a constant envelope signal, and PAPR becomes larger than 0 dB. As described above, it is generally difficult to use a signal after band limitation as a constant envelope signal.
- FIG. 13 illustrates this state in the frequency domain.
- the frequency spectrum of the constant envelope signal before oversampling is as shown in FIG. 13 (a)
- the signal has a frequency spectrum as shown in FIG. 13 (b).
- the band limitation by the filter as shown in FIG. 13C is performed, so that the out-of-band signal is removed and the constant envelope signal is lost. As a result, the PAPR increases.
- CAZAC Constant Amplitude Zero Auto-Correlation
- the signal has a constant amplitude before oversampling
- the problem that the amplitude is not fixed by performing band limitation after oversampling is a phenomenon that occurs even in general PSK and FSK signals. Therefore, even if a constant envelope signal is generated in order to reduce the PAPR and improve the operating efficiency of the power amplifier, the signal is oversampled by inserting a zero signal as in Patent Documents 1 and 2, and the bandwidth is limited. If the band is limited by the filter, the signal is not a signal having a constant amplitude. That is, the peak power increases and the PAPR increases, and the operation efficiency of the power amplifier is deteriorated.
- the present invention has been made in view of the above, and an object thereof is to obtain a transmitter and a transmission method for generating a signal with a low PAPR.
- the present invention is a transmitter that generates a transmission signal by oversampling a modulation signal, and performs a modulation process on an information sequence to perform a constant envelope.
- a predetermined number of signals having the same amplitude as the signal points are arranged between the modulation means for generating a signal and the signal points of the constant envelope signal so that the signal points including the original signal points are equally spaced.
- Interpolating means to be inserted into.
- a transmission signal with a low PAPR can be generated.
- FIG. 1 is a diagram illustrating a configuration example of a transmitter according to the first embodiment.
- FIG. 2 is a diagram illustrating an example of interpolation processing by the phase interpolation unit.
- FIG. 3 is a diagram illustrating an example of a spectrum of a signal obtained by oversampling the constant envelope signal.
- FIG. 4 is a diagram illustrating a configuration example of a transmitter according to the second embodiment.
- FIG. 5 is a diagram illustrating an example of frequency characteristics of the band limiting filter.
- FIG. 6 is a diagram illustrating an example of the self-folding operation.
- FIG. 7 is a diagram illustrating an example of the self-folding operation when the number of oversamples is two.
- FIG. 1 is a diagram illustrating a configuration example of a transmitter according to the first embodiment.
- FIG. 2 is a diagram illustrating an example of interpolation processing by the phase interpolation unit.
- FIG. 3 is a diagram illustrating an example of a spectrum of a signal
- FIG. 8 is a diagram illustrating an example of the self-folding operation when the number of oversamples is four.
- FIG. 9 is a diagram illustrating an example of the self-folding operation.
- FIG. 10 is a diagram illustrating an example of a transmission signal in which a GI is inserted.
- FIG. 11 is a diagram illustrating an example of a CP to be inserted into a transmission signal.
- FIG. 12 is a diagram showing an overview of oversampling processing.
- FIG. 13 is a diagram illustrating an example of changes in the frequency spectrum when oversampling and band limitation are performed on the constant envelope signal.
- FIG. 14 is a diagram showing test conditions for BER characteristics.
- FIG. 15 is a diagram illustrating BER characteristics.
- FIG. 1 is a diagram illustrating a configuration example of a first embodiment of a transmitter according to the present invention.
- the transmitter according to the present embodiment includes a modulation unit 11, a phase interpolation unit 12, a band limiting filter 13, a D / A conversion unit 14, a power amplification unit 15, and an antenna 16.
- the transmitter according to this embodiment is characterized in that oversampling is performed by phase interpolation. Below, explanation of each component of the transmitter is shown.
- the modulation unit 11 performs a modulation process on the input information sequence to generate a transmission signal.
- the modulated signal is a constant envelope signal having a constant amplitude, and is expressed as the following equation (1).
- j is an imaginary unit
- s (n) is a modulated transmission signal
- C is an amplitude
- ⁇ (n) is a phase
- N is a signal length.
- the phase interpolation unit 12 performs an interpolation process on the transmission signal generated by the modulation unit 11 and performs V-times oversampling (V ⁇ 2). That is, V-1 signals are inserted between each sample to generate a signal of length VN. At this time, the following V ⁇ 1 signals are inserted between the samples.
- V ⁇ 2 V-times oversampling
- the amplitude of the signal to be inserted is C. That is, a signal having the same amplitude as the signal before oversampling is inserted.
- B When interpolating between s (n) and s (n + 1), the shorter one of arcs having both ends of s (n) and s (n + 1) on the IQ plane is divided into V equal parts. Insert V-1 points as follows.
- the v-th (1 ⁇ v ⁇ V) signal point s_add (n, v) inserted between s (n) and s (n + 1) is expressed by the following equation (2).
- * represents a complex conjugate
- f_arg (x) is a function that returns the declination of x in the range of [ ⁇ , ⁇ ].
- the state of interpolation is shown on the IQ plane.
- the Nyquist point indicated by a black circle means a point (that is, s (n)) existing in the signal before oversampling.
- the signal s_ovs (n) after oversampling by oversampling by such an interpolation method is expressed by the following equation (3), where k is an integer of 0 or more.
- the length of this signal s_ovs (n) is VN.
- the signal after interpolation processing can also be a constant envelope signal with constant amplitude.
- the amplitude of the time domain signal changes due to the effect of removing the out-of-band signal, and the amplitude is not constant (that is, PAPR becomes larger than 0 dB).
- PAPR becomes larger than 0 dB.
- the phase interpolation unit 12 inserts a signal having an amplitude C by the method as described in (b) above. Since the phase variation ⁇ 1 per sample of the signal s (n) before the interpolation processing is ⁇ ⁇ ⁇ 1 ⁇ , the phase variation per sample of the signal s_ovs (n) after the interpolation processing ⁇ _ovs satisfies ⁇ / V ⁇ ⁇ _ovs ⁇ / V. In general, since the amount of phase change ⁇ per sample of the constant envelope signal is ⁇ ⁇ ⁇ ⁇ , the amount of phase change per sample of s_ovs (n) is 1 of the normal constant envelope signal. / V. Since the amount of phase change per sample cannot be further reduced, this interpolation method can be said to be an interpolation method that minimizes the amount of phase change per sample.
- the interpolation method of the present embodiment is a method that can minimize the amount of phase change per sample, and thus can be rephrased as a method that minimizes the high-frequency component of the signal after oversampling. . That is, this is a method that can minimize the out-of-band signal that is removed by the subsequent band-limiting filter. As a result, the PAPR of the signal after passing through the filter can be made close to 0 dB.
- FIG. 3 shows the spectrum of the signal s (n) when (i) oversampling is performed by inserting a 0 signal as in the conventional example, and (ii) oversampling is performed by phase interpolation.
- s_ovs (n) that is, the spectrum of the signal before being input to the band limiting filter.
- the oversample number V is four.
- the band limiting filter limits the signal to a quarter band of the illustrated range, that is, the range of ⁇ 4096 to 4096 on the horizontal axis. It can be seen that the out-of-band signal removed by the filter at this time is sufficiently smaller than the case of inserting the 0 signal.
- the out-of-band signal to be removed by the subsequent filtering process can be reduced.
- the band limiting filter 13 is a filter for removing out-of-band signals from the transmission signal, and performs filtering on the signal output from the phase interpolation unit 12.
- a root roll-off filter is often used, but in the present embodiment, the type of filter is not particularly limited.
- the D / A conversion unit 14 converts the output signal from the band limiting filter 13 from a digital signal to an analog signal.
- the power amplifier 15 amplifies the power of the analog transmission signal output from the D / A converter 14. Since the PAPR of the transmission signal of the present embodiment is small, the backoff at the power amplifying unit 15 can be made sufficiently small.
- the antenna 16 transmits the analog transmission signal after being amplified by the power amplification unit 15 toward the opposite device (receiver).
- the band limiting filter 13 is not always necessary, and it is possible not to provide this filter.
- the signal from the phase interpolation unit 12 is directly input to the D / A conversion unit 14. With such a configuration, since the out-of-band signal is not removed by the filter, the PAPR can be completely set to 0 dB.
- the method of the present embodiment can be used not only for signals after modulation but also for various signals.
- the method of this embodiment can be used even when a sequence with a constant amplitude (for example, a CAZAC sequence) is transmitted as it is as a pilot signal.
- the modulation unit 11 shown in FIG. 1 is not necessary, and a sequence to be transmitted may be directly input to the phase interpolation unit 12 and the subsequent processing may be performed.
- the transmitter when oversampling the constant envelope signal having a constant amplitude obtained by modulating the information sequence with the oversample number V, between each sample point of the constant envelope signal.
- V-1 signals having the same amplitude as the constant envelope signal are inserted at equal intervals (so that the phase change amount of each signal including each sample point of the constant envelope signal is the same). It was decided to.
- a transmission signal with a low PAPR can be generated.
- FIG. FIG. 4 is a diagram illustrating a configuration example of a transmitter according to the second embodiment.
- the band limiting filter 13 of the transmitter described in the first embodiment is replaced with a DFT unit 21, a band limiting filter 22, a self-folding operation unit 23, and an IDFT unit 24. It is a thing. Since each part other than these is the same as the transmitter of Embodiment 1, it attaches
- the transmitter of Embodiment 1 it is possible to generate a transmission signal with a small PAPR.
- the conventional oversampling method for inserting a zero signal is the only method in which waveform distortion does not occur due to the subsequent band limiting filter.
- the waveform distortion is caused by the subsequent band limiting filter. Arise. Therefore, when oversampling by the transmitter of Embodiment 1 is applied, PAPR can be kept low, but there is a problem that sensitivity characteristics at the receiver deteriorate and error rate characteristics deteriorate. Therefore, in this embodiment, a transmitter capable of reducing the deterioration of the error rate characteristic will be described.
- the phase interpolated signal output from the phase interpolating unit 12 is converted into a frequency domain signal by the VN point DFT (Discrete Fourier Transform) in the DFT unit 21, and the band in the frequency domain is converted. Band limiting by the limiting filter 22 is performed.
- the time domain signal after phase interpolation is s_ovs (n).
- the signal after DFT is S_OVS [k]
- the signal after band limitation by the band limitation filter 22 is S_FIL [k]
- the signal removed by the band limitation filter 22 is S_CUT [k]
- H [k] F [s_ovs (n)]
- S_FIL [k] S_OVS [k] H [k]
- S_CUT [k] S_OVS [k] (H max ⁇ H [k]) (5)
- H [k] represents the frequency characteristic of the band limiting filter 22
- H max represents the maximum value of
- F [x (n)] represents the DFT of x (n).
- is shown in FIG. As illustrated, H [k] is defined by ⁇ VN / 2 ⁇ k ⁇ VN / 2.
- the band limiting filter 22 obtains the band-limited signal S_FIL [k] by multiplying the post-DFT signal S_OVS [k] by the filter frequency characteristic H [k]. Further, the signal S_CUT [k] to be removed by the band limiting process is obtained by multiplying the post-DFT signal S_OVS [k] by H max ⁇ H [k]. The band limiting filter 22 outputs these signals S_FIL [k] and S_CUT [k] to the self-folding operation unit 23.
- the self-folding operation unit 23 adds a part or all of S_CUT [k] input from the band limiting filter 22 to S_FIL. At this time, S_CUT [k] is not added as it is, but is added by returning S_CUT [k] within the band (within the band of S_FIL). This is called a self-wrapping operation.
- S_CUT [k] is added to S_FIL according to the following formulas (6) to (9).
- the signal after the self-folding operation is S_FOLD [k].
- the range of k of each signal is a range represented by the following equation (10). ⁇ VN / 2 ⁇ k ⁇ VN / 2 (10)
- FIG. 6 shows the self-folding operation performed according to the above equations (6) to (9).
- the self-folding operation unit 23 adds a part or all of S_CUT [k] to S_FIL. That is, for k satisfying ⁇ VN / 2 ⁇ k ⁇ VN / 2, it is not necessary to add all S_CUT [k] to S_FIL, and a part thereof may be used.
- any method may be used for selecting the k. However, the error rate degradation can be reduced as the number of k is added.
- the band of the filtered signal S_FIL [k] is limited to ⁇ N / 2 ⁇ a ⁇ k ⁇ N / 2 + d.
- the signal is also added to the range of, and as a result, the band of S_FOLD [k] may be wider than the band of S_FIL [k].
- S_CUT [k] in the range of TH_L ⁇ k ⁇ TH_H may be added to S_FIL.
- TH_L and TH_H are arbitrary real numbers.
- the signal once removed by the band limiting filter 22 is returned to the transmission signal again, so that the waveform distortion generated in the first embodiment can be reduced. Further, since the same signal is merely folded back within the band, the PAPR does not increase greatly, and a PAPR equivalent to that in Embodiment 1 can be realized.
- the signal S_FOLD [k] generated by the self-folding operation as described above is input to the IDFT unit 24 and converted into a time domain signal by a VN point IDFT (Inverse Discrete Fourier Transform).
- VN point IDFT Inverse Discrete Fourier Transform
- band limitation by the band limitation filter 22 is performed in the frequency domain.
- band limitation using a band limitation filter is often performed in the time domain instead of the frequency domain, but in this case, the signal S_CUT [k] removed by the filter cannot be obtained. Therefore, in the present embodiment, band limitation is performed by a band limitation filter in the frequency domain.
- the processing of the DFT unit 21, the band limiting filter 22, the self-folding operation unit 23, and the IDFT unit 24 is performed on a signal of length VN. Therefore, when the length of the signal input from the phase interpolation unit 12 is L, if L is larger than VN, the signal is divided into signals of length VN, and the DFT unit 21 and the subsequent signals are divided for each of the divided signals. Process. Then, the signal with the length VN output from the IDFT unit 24 is combined into a signal with the length L again.
- a guard interval (GI) may be inserted as shown in FIG.
- This guard interval is equivalent to that generally used in OFDM (Orthogonal Frequency Division Multiplexing). Since the guard interval is discarded without being demodulated at the receiver, the contents can be anything. All may be 0, or the end portion of the signal of length VN may be copied as shown in FIG.
- the guard interval shown in FIG. 11 is particularly called a cyclic prefix (CP).
- a root roll-off filter is often used as the band limiting filter, but the type of filter is not particularly limited in the present embodiment as in the first embodiment.
- the fact that the influence of the waveform distortion due to the band limiting filter can be completely removed by self-folding operation regardless of the type of filter will be described using mathematical expressions.
- the signal before phase interpolation is a constant envelope signal s (n) expressed by the above equation (1).
- the signal after the self-folding operation in the case of performing the self-folding operation by a mathematical expression.
- the frequency characteristic of the band limiting filter is H [k] (0 ⁇ k ⁇ 2N).
- S_FIL [k] S_OVS [k] H [k] (0 ⁇ k ⁇ 2N)
- S_CUT [k] S_OVS [k] (H max ⁇ H [k]) (0 ⁇ k ⁇ 2N) (13)
- n is an even number
- n is as follows when it is divided into an odd number.
- the signal is oversampled twice, and the receiving side performs demodulation processing after downsampling. Since s_fold (2n + 1) corresponds to a signal inserted for oversampling, it is removed at the time of downsampling on the receiving side. Therefore, only s_fold (2n) affects the error rate characteristics at the receiver.
- one method for suppressing the PAPR of an OFDM signal is called clip-and-filter.
- the process of removing high-frequency components using a filter is repeated.
- a self-folding operation is applied, and a part or all of the out-of-band signal removed by the filter is folded and added to the band, and the error rate is It is considered possible to prevent deterioration of characteristics.
- FIG. 15 shows an example of BER (Bit Error Rate) characteristics in the case of the specifications of FIG. “Embodiment 1” performs oversampling only by phase interpolation as described in Embodiment 1, and “Embodiment 2” indicates oversampling by phase interpolation as described in this embodiment, and self This is a case where a loopback operation is performed.
- the transmitter according to the present embodiment performs the interpolation process in the same procedure as the transmitter according to the first embodiment, and then performs band limitation with the band limiting filter in the frequency domain, and after the band limitation is performed. A part or all of the signal (out-of-band signal) removed by the band limiting filter is added to the signal by folding it back into the band.
- adopted, ie, the waveform distortion which arises by applying a band-limiting filter after phase interpolation can be reduced.
- the self-folding operation of the present embodiment merely wraps the same signal in the band, the PAPR does not increase greatly by this processing, and the PAPR equivalent to the first embodiment is realized. it can.
- the transmitter according to the present invention is useful as a transmitter that transmits a signal with a low PAPR, and is particularly suitable for a transmitter that generates a transmission signal by oversampling a constant envelope signal. Yes.
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Abstract
Description
図1は、本発明にかかる送信機の実施の形態1の構成例を示す図である。図示したように、本実施の形態の送信機は、変調部11、位相補間部12、帯域制限フィルタ13、D/A変換部14、電力増幅部15およびアンテナ16を備える。
(a)挿入する信号の振幅はCとする。即ち、オーバーサンプリング前の信号と同じ振幅の信号を挿入する。
(b)s(n)とs(n+1)の間を補間する際は、IQ平面上でs(n)、s(n+1)を両端とする弧のうち短い方をV等分するようにV-1個の点を挿入する。
図4は、実施の形態2の送信機の構成例を示す図である。本実施の形態の送信機は、実施の形態1で説明した送信機(図1参照)の帯域制限フィルタ13を、DFT部21、帯域制限フィルタ22、自己折り返し操作部23およびIDFT部24に置き換えたものである。これら以外の各部は実施の形態1の送信機と同様であるため、同じ符号を付して説明を省略する。
S_FIL[k]=S_OVS[k]H[k]
S_CUT[k]=S_OVS[k](Hmax-H[k]) …(5)
ただし、H[k]は帯域制限フィルタ22の周波数特性、Hmaxは|H[k]|の最大値、F[x(n)]はx(n)のDFTを表す。|H[k]|の例を図5に示す。図示したように、H[k]は-VN/2≦k<VN/2で定義される。
図5に示したように、
|H[k]|=0となるkのうち、
k<0で最大のものをk=-N/2-a、
k>0で最小のものをk=N/2+d、
また、|H[k]|=Hmaxとなるkのうち、
k<0で最小のものをk=-N/2+b、
k>0で最大のものをk=N/2-c、
とする。ただし、a~dは0以上の実数とする。帯域制限フィルタ22としてルートロールオフフィルタやフルロールオフフィルタを用いる場合は、a=b=c=dとなる。
-N/2≦k<0の場合
S_FOLD[k+N]=S_FIL[k+N]+S_CUT[k] …(6)
k<-N/2の場合
S_FOLD[k+pN]=S_FIL[k+pN]+S_CUT[k] …(7)
ただし、pは整数であり、-N/2≦k+pN<N/2となるようにpは選択される。
(II)k≧0の場合
0≦k<N/2の場合
S_FOLD[k-N]=S_FIL[k-N]+S_CUT[k] …(8)
k≧N/2の場合
S_FOLD[k-pN]=S_FIL[k-pN]+S_CUT[k] …(9)
ただし、pは整数であり、-N/2≦k-pN<N/2となるようにpは選択される。
-VN/2≦k<VN/2 …(10)
S_FIL[k]=S_OVS[k]H[k] (0≦k<2N)
S_CUT[k]=S_OVS[k](Hmax-H[k]) (0≦k<2N) …(13)
Claims (8)
- 変調信号をオーバーサンプリングして送信信号を生成する送信機であって、
情報系列に対して変調処理を実施して定包絡線信号を生成する変調手段と、
前記定包絡線信号の各信号点の間に、当該信号点と振幅が同一の所定数の信号を、元の信号点を含む各信号点が等間隔となるように挿入する補間手段と、
を備えることを特徴とする送信機。 - 前記定包絡線信号の信号点をs(k)(ただし、k=0,1,…,n-1,n,n+1,…)、オーバーサンプリング数をVとしたとき、
前記補間手段は、
s(n)とs(n+1)の間を補間する場合には、IQ平面上でs(n)およびs(n+1)を両端とする弧のうち短い方をV等分するようにV-1個の信号点を挿入する
ことを特徴とする請求項1に記載の送信機。 - 前記補間手段による信号挿入処理が実施された後の信号に対して帯域制限を行う帯域制限フィルタ手段、
をさらに備えることを特徴とする請求項1または2に記載の送信機。 - 前記補間手段による信号挿入処理が実施された後の信号を周波数領域の信号に変換する信号変換手段と、
前記信号変換手段から出力される周波数領域信号に対して帯域制限を行うとともに、当該帯域制限にて除去された信号である帯域外信号の一部または全部を、当該帯域制限にて除去されなかった信号である帯域内信号の帯域内に折り返して当該帯域内信号に加算する帯域制限フィルタ手段と、
を備えることを特徴とする請求項1または2に記載の送信機。 - 前記帯域制限で使用するフィルタの周波数特性をH[k](0≦k<VN)、|H[k]|の最大値をHmax、オーバーサンプリング数をVとしたとき、
前記フィルタの周波数特性H[k]は、以下の条件を満たす
H[k]+H[k+(V-1)N]=Hmax (0≦k<N)
H[k]=0 (N≦k<(V-1)N)
ことを特徴とする請求項4に記載の送信機。 - 変調信号をオーバーサンプリングして送信信号を生成する送信機が実行する送信方法であって、
情報系列に対して変調処理を実施して定包絡線信号を生成する定包絡線信号生成ステップと、
前記定包絡線信号の各信号点の間に、当該信号点と振幅が同一の所定数の信号を、元の信号点を含む各信号点が等間隔となるように挿入する信号挿入ステップと、
前記信号挿入ステップを実行して得られた信号をアナログ信号に変換するDA変換ステップと、
前記DA変換ステップを実行して得られたアナログ送信信号を増幅して送信する信号送信ステップと、
を含むことを特徴とする送信方法。 - 前記信号挿入ステップを実行して得られた信号に対して帯域制限を行う帯域制限ステップ、
をさらに含み、
前記DA変換ステップでは、前記信号挿入ステップを実行して得られた信号に代えて、前記帯域制限ステップを実行して得られた信号をアナログ信号に変換する
ことを特徴とする請求項6に記載の送信方法。 - 前記信号挿入ステップを実行して得られた信号を周波数領域の信号に変換する第1の信号変換ステップと、
前記第1の信号変換ステップを実行して得られた周波数領域信号に対して帯域制限を行うとともに、当該帯域制限にて除去された信号である帯域外信号の一部または全部を、当該帯域制限にて除去されなかった信号である帯域内信号の帯域内に折り返して当該帯域内信号に加算する帯域制限ステップと、
前記帯域制限ステップを実行して得られた信号を時間領域の信号に変換する第2の信号変換ステップと、
をさらに含み、
前記DA変換ステップでは、前記信号挿入ステップを実行して得られた信号に代えて、前記第2の信号変換ステップを実行して得られた信号をアナログ信号に変換する
ことを特徴とする請求項6に記載の送信方法。
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EP12877604.4A EP2905906B1 (en) | 2012-09-07 | 2012-09-07 | Transmitter and transmission method |
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CN115102822A (zh) * | 2018-07-26 | 2022-09-23 | 中兴通讯股份有限公司 | 一种数据调制方法、装置及计算机存储介质 |
CN111092838B (zh) * | 2019-09-10 | 2024-05-24 | 中兴通讯股份有限公司 | 一种序列生成方法、装置和存储介质 |
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