Single carrier transmitter

Abstract

To improve reception performance by reducing the PAPR of an entire signal of SC-FDE blocks including UW set to high amplitude, while maintaining the same effect by DPD as before.SOLUTION: A pseudo transmitter 130 of a single carrier transmitting device 1 simulates transmission path distortion for an SC-FDE block. A time-division switching separation unit 10 separates an IQchannel_data signal from the SC-FDE block for which transmission path distortion is simulated. A data signal IQ compensation calculation unit 11 obtains transmission path distortion, from the IQchannel_data signal for which transmission path distortion is simulated and an IQdata signal for which transmission path distortion is not simulated, adds an inverse characteristic of the transmission path distortion to the IQdata signal, and generates an IQDPD_data signal with DPD. A time-division switching combining unit 13 combines the IQDPD_data signal with DPD and an IQUW signal without DPD.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a digital signal transmitting device that can be used in wireless transmission systems such as broadcasting or communications, and more particularly to a single carrier transmitting device that performs channel equalization in the frequency domain. [Background technology]

[0002] Conventionally, single-carrier schemes using one carrier have been widely used in fixed-transmission wireless transmission systems for broadcasting, communication, etc. In recent years, among single-carrier schemes, a single-carrier-frequency domain equalization (SC-FDE) scheme has been proposed that performs channel equalization in the frequency domain (processing to restore amplitude and phase changes that occur in a propagation path) (see, for example, Non-Patent Document 1 and Patent Document 1).

[0003] The SC-FDE method, like the Orthogonal Frequency Division Multiplexing (OFDM) method, can follow fast channel fluctuations in mobile transmission by performing channel estimation and channel equalization in the frequency domain on a block-by-block basis. Therefore, it is more suitable for mobile transmission than the conventional single-carrier method that performs channel equalization in the time domain.

[0004] Furthermore, in the SC-FDE scheme, like the OFDM scheme, a GI (Guard Interval) can be provided to prevent interference between blocks in a multipath environment.

[0005] This SC-FDE method performs block synchronization to detect the beginning of a block, extracts a unique word (a fixed pattern signal) and data for channel estimation, converts the unique word and data to the frequency domain by Fourier transform, and performs channel estimation and channel equalization. After that, the data is converted back to a time domain signal by inverse Fourier transform, and processing such as symbol decision is performed.

[0006] In addition, the SC-FDE system generally has a smaller PAPR (Peak to Average Power Ratio), which is the ratio of the peak power to the average power of the transmission signal, compared to the multi-carrier OFDM system. Therefore, it has higher tolerance to distortion caused by nonlinear characteristics in the power amplifier at the output stage of the transmitting device than the OFDM system, and can increase the transmission power. As a result, it is possible to secure the receiving C / N margin, and therefore it is possible to improve the receiving performance.

[0007] [Problem of nonlinear amplification] The SC-FDE system is less susceptible to degradation than the OFDM system, but when the power amplifier is operated in the high output saturation region, the linearity of the input / output characteristics deteriorates.

[0008] FIG. 6 is a diagram showing the input / output characteristics (AM / AM (amplitude / amplitude) characteristics and AM / PM (amplitude / phase) characteristics) of a power amplifier. The horizontal axis indicates input power [dB], and the vertical axis indicates output power [dB] and phase shift [degree]. A indicates the ideal output power characteristic with respect to input power (ideal AM / AM characteristics), and B indicates the actual output power characteristic with respect to input power (actual AM / AM characteristics). C indicates the ideal phase shift characteristic with respect to input power (ideal AM / PM characteristics), and D indicates the actual phase shift characteristic with respect to input power (actual AM / PM characteristics).

[0009] From Fig. 6, it can be seen that the linearity of the actual AM / AM characteristic b and the actual AM / PM characteristic d becomes poor in the high output region. Due to the influence of such input / output characteristics of the power amplifier, nonlinear amplitude distortion and phase distortion occur in the output signal of the power amplifier. As a result, the center of gravity of the received IQ signal group shifts from the desired IQ signal point (ideal signal point), and the received IQ signal point spreads, degrading the receiving performance.

[0010] As a conventional technique for addressing such issues, a method has been disclosed that uses a satellite broadcasting transmission method (ISDB-S3 method), which is also a single carrier method, although it is not a single carrier method that performs channel equalization in the frequency domain (see, for example, Patent Document 2).

[0011] This method can deal with similar problems such as the center of gravity of the received IQ signal group shifting from the desired IQ signal point when a traveling wave tube amplifier (TWTA) is operated in the high output saturation region. This method is called Digital Pre-Distortion (hereinafter referred to as "DPD").

[0012] Specifically, the transmitting device acquires in advance the characteristics of devices that cause distortion, such as an input filter, a TWTA, and an output filter, provided in the satellite repeater.The transmitting device then simulates distortion and obtains a vector difference of the transmission signal with the simulated distortion from a transmission signal without distortion.The transmitting device subtracts the vector difference of the transmission symbol with the simulated distortion from the vector of the transmission signal without distortion, thereby generating a transmission signal with the inverse characteristic of the distortion in the satellite transmission path added for each signal point.

[0013] As a result, distortion in the actual satellite transmission path is cancelled, and the received signal at the receiving device converges to an ideal signal point while suppressing the spread of the signal point, thereby improving reception performance (see, for example, non-patent document 2).

[0014] The above-mentioned Patent Document 2 proposes an embodiment in which DPD is applied to a satellite broadcasting system using the ISDB-S3 system, and shows effects and improvements in reception performance. It is also considered that similar effects and improvements can be expected when DPD is applied to a power amplifier system using the SC-FDE system. However, when DPD is applied directly to the SC-FDE system, the following problems arise.

[0015] [Issues when DPD is applied to SC-FDE] 7 is a diagram showing a symbol block configuration of the SC-FDE scheme. A symbol block of the SC-FDE scheme (SC-FDE block symbol) is composed of a GI (unique word (UW)) of M symbol length, data of N symbol length, and a UW of M symbol length.

[0016] The length of an SC-FDE block symbol is 2M+N symbols, and the N+M symbol-long portion that is the N-symbol-long data and the M-symbol-long UW is the symbol to be equalized.

[0017] The SC-FDE scheme differs from the ISDB-S3 scheme in that, in addition to data, it has a certain percentage of UWs (for channel estimation) used for frequency equalization, as shown in Fig. 7. Even if this UW is subjected to the DPD processing described in Patent Document 2 for each signal point, this does not pose a problem in terms of frequency equalization, but there is a concern that the PAPR will increase due to DPD.

[0018] Generally, the method using DPD described in Patent Document 2 has a higher PAPR than the method without DPD, according to Non-Patent Document 2. This is because the method of Patent Document 2 dynamically processes DPD for each signal point, and therefore, for example, when the modulation method is 32APSK (Amplitude and Phase Shift Keying), there are times when the signal point is placed outside the outermost circle, and the peak voltage of the transmission signal becomes large.

[0019] In this way, compared to a method that does not use DPD, the method using DPD increases the PAPR and reduces the output power of the power amplifier, but it is effective because the receiving performance itself is improved and the improvement is greater than the power reduction.

[0020] However, when the amplitude of UW in the SC-FDE system is set to be larger than the maximum amplitude of data (for example, the amplitude of the outermost circle in the case of 32APSK) and the DPD processing described in the above-mentioned Patent Document 2 is performed, the PAPR increase (reduction in the output power of the power amplifier) ​​seen in the ISDB-S3 system becomes more noticeable. As a result, it may not be possible to demonstrate the effectiveness seen in the above-mentioned Non-Patent Document 2.

[0021] For example, the results of calculations on the relationship between the required C / N and the amplitude of the UW in a white noise environment have been disclosed, and it has been shown that when the average power is set to 1, the amplitude of the UW is optimal at 1.3 (see, for example, Non-Patent Document 3). This shows the case where the amplitude of the UW in the SC-FDE method is set to be larger than the amplitude of the data when the modulation method is 32APSK. [Prior art documents] [Patent documents]

[0022] [Patent Document 1] Patent No. 5624527 [Patent Document 2] Patent No. 6681672 [Non-patent literature]

[0023] [Non-Patent Document 1] D. Falconer, et al., “Frequency domain equalization for single-carrier broadband wireless systems”, IEEE Commun. Mag., Vol. 40, pp. 58-66, April 2002. [Non-Patent Document 2] Institute of Electronics, Information and Communication Engineers Technical Report SAT2019-53 [Non-Patent Document 3] 2018 Institute of Electronics, Information and Communication Engineers General Conference B-5-94 Summary of the Invention [Problem to be solved by the invention]

[0024] FIG. 8 is a block diagram showing an example of the configuration of a conventional single carrier transmission device, and shows a configuration that does not support DPD and uses the SC-FDE scheme.

[0025] This single carrier transmitting device 100 includes a transmission pre-processing unit 110, a mapping unit 111, a UW signal generating unit 112, a time division switching synthesis unit 113, an upsampling unit 114, a waveform shaping unit 115, an orthogonal modulation unit 116, a DA conversion unit 117, a frequency conversion unit 118, a power amplification unit (power amplifier) ​​119, and a transmitting antenna 120.

[0026] The information bit sequence to be transmitted (data to be transmitted) is subjected to pre-transmission processing in the pre-transmission processing unit 110, and mapping processing is performed in the mapping unit 111. Then, the mapped IQ data A known fixed pattern IQ generated by the signal and UW signal generator 112 UW The signals are time-division switched and combined in time-division switching and combining section 113. In this way, an SC-FDE block is generated.

[0027] The SC-FDE block is upsampled in upsampling unit 114, waveform shaped in waveform shaping unit 115, quadrature modulated in quadrature modulation unit 116, and converted into an analog signal in DA conversion unit 117. The analog signal converted in DA conversion unit 117 is then converted from an intermediate frequency modulated signal to a radio frequency modulated signal in frequency conversion unit 118, and amplified to a specified power in power amplification unit 119. In this manner, the radio frequency modulated wave is transmitted via transmission antenna 120.

[0028] In the conventional single carrier transmission apparatus 100 shown in Fig. 8, as described above, when the power amplifier 119 is operated in a high output region, the linearity of the input / output characteristics deteriorates and the receiving performance deteriorates. In order to solve this problem, it is assumed that the DPD described in the above-mentioned Patent Document 2 will be used.

[0029] In other words, the single-carrier transmission device using DPD described in Patent Document 2 simulates transmission path distortion in which the center of gravity of a received IQ signal group shifts from a desired IQ signal point, and performs DPD processing to generate a transmission signal for each signal point so that the transmission path distortion is removed on the receiving side.

[0030] However, the DPD processing described in Patent Document 2 does not take into account signals such as UW transmitted by single carrier transmitting apparatus 100 shown in FIG.

[0031] FIG. 9 is a block diagram showing an example configuration when the DPD of Patent Document 2 is applied to the conventional single carrier transmission apparatus 100 shown in FIG. 8, and shows an assumed technique in a DPD-compatible configuration using the SC-FDE method.

[0032] This single carrier transmitting device 101 includes a transmission pre-processing unit 110, a mapping unit 111, a UW signal generating unit 112, a time division switching synthesis unit 113, an upsampling unit 114, a waveform shaping unit 115, a pseudo transmitter 130, a waveform shaping unit 131, a downsampling unit 132, a data signal IQ compensation calculation unit 133, an analog signal generating unit 134, a power amplification unit 119 and a transmitting antenna 120.

[0033] The processing from the transmission pre-processing unit 110 to the waveform shaping unit 115 is the same as in Fig. 8. The SC-FDE block waveform-shaped by the waveform shaping unit 115 is subjected to input / output characteristics of an actual transmission path (here, this refers to the power amplification unit 119. The same applies to Figs. 1 and 3 described later) in the dummy transmitter 130.

[0034] Here, the dummy transmitter 130 dummy-simulates an actual transmission path on a digital signal, and reflects the input / output characteristics (AM / AM characteristics and AM / PM characteristics) of the power amplifier shown in FIG.

[0035] The SC-FDE block, in which the input / output characteristics of the power amplifier 119 are reflected by the dummy transmitter 130 , is waveform-shaped by the waveform shaping section 131 and downsampled by the downsampling section 132 .

[0036] The signal downsampled by the downsampling unit 132 is input to the data signal IQ compensation calculation unit 133 as an IQ signal (IQ signal of data and UW) in which the transmission path distortion is simulated. data The signal is input to a data signal IQ compensation calculation section 133 .

[0037] An IQ signal in which the transmission path distortion is simulated, which is an output signal of the downsampling unit 132, and an IQ signal in which the transmission path distortion is not simulated, which is an output signal of the mapping unit 111. data The signals are input to a data signal IQ compensation calculation unit 133. Then, these signals are subjected to DPD processing for compensating for transmission line distortion, and an IQ signal with DPD is generated.

[0038] Specifically, the IQ signal with simulated transmission line distortion is compared with the IQ signal without simulated transmission line distortion. data By subtracting the signal, an error vector that reflects the transmission distortion is obtained. And, the IQ data The IQ signal with DPD is obtained by subtracting the error vector that reflects the transmission distortion from the signal.

[0039] As a result, a transmission signal to which the inverse characteristics of the distortion in the actual transmission path have been added is generated for each signal point, and is input to the analog signal generation unit 134 as an IQ signal with DPD (data and UW IQ signals to which the inverse characteristics of the transmission path distortion have been added).

[0040] The IQ signal with DPD is subjected to analog signal generation processing shown in FIG. 10, which will be described later, in the analog signal generation unit 134, and a radio frequency modulated signal is generated.

[0041] 10 is a block diagram showing an example of the configuration of the analog signal generating section 134. This analog signal generating section 134 includes an upsampling section 140, a waveform shaping section 141, a quadrature modulation section 142, a DA conversion section 143, and a frequency conversion section 144.

[0042] The IQ signal with DPD input from the data signal IQ compensation calculation unit 133 is upsampled in the upsampling unit 140, and waveform shaping is performed in the waveform shaping unit 141. Then, digital quadrature modulation processing is performed in the quadrature modulation unit 142, and aperture correction is performed in the downstream DA conversion unit 143 to correct the aperture effect caused by digital / analog conversion.

[0043] The digital signal, which is the quadrature modulated modulated signal, is converted into an analog signal by the DA conversion unit 143, and is then converted into a radio frequency modulated signal by the frequency conversion unit 144.

[0044] 9, the radio frequency modulated signal generated by the analog signal generating unit 134 is amplified to a specified power by the power amplifying unit 119. Here, since the transmission path simulated by the above-mentioned dummy transmitter 130 is the power amplifying unit 119, the power amplifying unit 119 is a transmission path from the perspective of the dummy transmitter 130. In this manner, the radio frequency modulated wave is transmitted via the transmitting antenna 120.

[0045] The above-mentioned DPD processing by the data signal IQ compensation calculation unit 133 is performed on the data and UW IQ signals to generate the data and UW IQ signals with DPD. On the other hand, the original purpose of the DPD processing is to compensate for the transmission path distortion (nonlinearity) of the data IQ signals, and is not intended to compensate for the transmission path distortion of the UW IQ signals.

[0046] In the DPD-compatible single-carrier transmission device 101 shown in Fig. 9, this does not pose a problem when frequency equalization is performed on the receiving side, but since DPD processing is performed on the UW IQ signal, which has a larger amplitude than the data, the amplitude of the UW IQ signal becomes even larger. This raises concerns that the PAPR of the entire signal in the SC-FDE block will increase, the output power will decrease, and as a result, the reception characteristics will deteriorate.

[0047] Therefore, the present invention has been made to solve the above-mentioned problems, and its object is to provide a single carrier transmitting device that can improve receiving performance by reducing the PAPR of the entire signal of an SC-FDE block including a UW set to a high amplitude, while maintaining the same effect of DPD as in the conventional method. [Means for solving the problem]

[0048] In order to solve the above problem, the single carrier transmission device of claim 1 generates an SC-FDE block including data to be transmitted and a UW (unique word) for channel estimation, modulates the signal of the SC-FDE block, amplifies the power of the signal in a power amplifier, and transmits a modulated wave. In the single carrier transmission device, a coded bit sequence of the data to be transmitted is mapped using a predetermined modulation method, and an IQ data A data signal generator generates a signal, and the UW signal, which is a known fixed pattern, is generated by an IQ UW a UW signal generating unit that generates a UW signal as an IQ signal generated by the data signal generating unit; data signal and the IQ generated by the UW signal generating unit UW a first time division switching combiner that generates a first SC-FDE block by switching and combining signals in a time division manner; a pseudo transmitter that simulates a transmission path distortion using the power amplifier as a transmission path by reflecting an input / output characteristic of the power amplifier in the SC-FDE block generated by the first time division switching combiner, and outputs a second SC-FDE block; and channel_data IQ of UW where signal and transmission line distortion are simulated channel_UW a time division switching and separating unit for switching and separating the IQ signal generated by the data signal generating unit in a time division manner; data The IQ signal separated by the time division switching separation unit channel_data and calculating an error vector between the IQ data By adding the inverse characteristic of the transmission line distortion to the signal, IQ DPD_dataa data signal IQ compensation calculation unit that generates a signal; and DPD_data signal and the IQ generated by the UW signal generating unit UW The signal processing unit includes a second time division switching and combining unit that generates a third SC-FDE block by switching and combining signals in a time division manner, an analog signal generating unit that performs upsampling, waveform shaping, orthogonal modulation, digital-to-analog conversion and frequency conversion on the third SC-FDE block generated by the second time division switching and combining unit to generate an analog signal, and the power amplifying unit that performs power amplification on the analog signal generated by the analog signal generating unit.

[0049] The single carrier transmission apparatus of claim 2 is the single carrier transmission apparatus of claim 1, wherein the data signal IQ compensation calculation unit calculates the IQ generated by the data signal generation unit. data The signal is delayed by a preset delay amount D1, and the delayed IQ data_1 The signal is output and delayed by a preset delay amount D2. data_2 a delay unit that outputs a signal, and the IQ signal separated by the time division switching separation unit channel_data The IQ output from the delay unit data_1 a first vector calculation unit that subtracts a signal from the IQ signal to obtain the error vector; an inverse characteristic coefficient unit that multiplies the error vector obtained by the first vector calculation unit by a preset inverse characteristic coefficient to obtain an error vector after multiplication; data_2 The error vector after multiplication obtained by the inverse characteristic coefficient unit is subtracted from the IQ DPD_data and a second vector calculation unit for determining a signal.

[0050] Moreover, the single carrier transmission device of claim 3 In a single carrier transmission device that generates an SC-FDE block including data to be transmitted and a UW (unique word) for channel estimation, modulates the signal of the SC-FDE block, amplifies the power of the signal in a power amplifier, and transmits a modulated wave, a mapping is performed on the coded bit sequence of the data to be transmitted using a predetermined modulation method, and an IQ data A data signal generator generates a signal, and the UW signal, which is a known fixed pattern, is generated by an IQ UW a UW signal generating unit that generates a UW signal as an IQ signal generated by the data signal generating unit; data signal and the IQ generated by the UW signal generating unitUW a first time division switching combiner that generates a first SC-FDE block by switching and combining signals in a time division manner; a pseudo transmitter that simulates a transmission path distortion using the power amplifier as a transmission path by reflecting an input / output characteristic of the power amplifier in the SC-FDE block generated by the first time division switching combiner, and outputs a second SC-FDE block; and channel_data IQ of UW where signal and transmission line distortion are simulated channel_UW a time division switching and separating unit for switching and separating the IQ signal generated by the data signal generating unit in a time division manner; data The IQ signal separated by the time division switching separation unit channel_data and calculating an error vector between the IQ data By adding the inverse characteristic of the transmission line distortion to the signal, IQ DPD_data a data signal IQ compensation calculation unit that generates a signal; The IQ separated by the time division switching separation unit channel_UW signal and the IQ generated by the UW signal generating unit UW Based on the signal, IQ channel_UW An average value of an error in a signal is detected, and a correction value is calculated from the average value of the error using the input / output characteristics of the power amplifier. Based on the correction value, the IQ UW By correcting the signal, IQ DPD_UW Amplitude and phase correction section that generates signals and, The IQ generated by the data signal IQ compensation calculation unit DPD_data signal and the IQ generated by the amplitude and phase correction unit DPD_UW By switching and synthesizing the signals in a time-division manner, , No. Generate 3 SC-FDE blocks a second time division switching synthesis unit; an analog signal generation unit that performs upsampling, waveform shaping, quadrature modulation, DA conversion, and frequency conversion on the third SC-FDE block generated by the second time division switching synthesis unit to generate an analog signal; and a power amplification unit that performs power amplification on the analog signal generated by the analog signal generation unit. It is characterized by:

[0051] The single carrier transmission apparatus of claim 4 is the single carrier transmission apparatus of claim 3, wherein the amplitude and phase correction unit is configured to correct the IQ channel_UW signal and the IQ generated by the UW signal generating unit UW The IQ in the second SC-FDE block is calculated based on the signal. channel_UW The amplitude error and phase error of all symbols that make up the signal are detected, their average values ​​are calculated, and these are then used to calculate the IQ channel_UW a UW signal amplitude and phase error detection unit that detects the average value of the amplitude distortion and the average value of the phase distortion of a signal; channel_UW The average value of the amplitude distortion and the average value of the phase distortion of the signal are compared with the error between the ideal input / output characteristics of the UW in the power amplifier unit and the actual input / output characteristics of the UW, and the IQ channel_UWAn operating point where the average value of the amplitude distortion and the average value of the phase distortion of the signal coincide with the error is identified, and the IQ channel_UW a comparator for determining input characteristic values ​​corresponding to the average value of the amplitude distortion and the average value of the phase distortion of a signal as an amplitude correction value and a phase correction value; UW The amplitude correction value obtained by the comparison unit is added to the amplitude of the signal, and the IQ UW The phase correction value obtained by the comparison unit is added to the phase of the signal, and the IQ DPD_UW and a UW correction signal generating unit for determining the UW correction signal. Effect of the Invention

[0052] As described above, according to the present invention, it is possible to reduce the PAPR of the entire signal of an SC-FDE block including a UW set to a high amplitude while maintaining the same effect of DPD as in the past. This allows the transmission power to be higher than in the past, and the reception C / N margin on the receiving side to be secured, thereby improving the reception performance. [Brief description of the drawings]

[0053] [Figure 1] 1 is a block diagram showing a configuration example of a single carrier transmission device according to a first embodiment. [Diagram 2] 11 is a block diagram showing a configuration example of a data signal IQ compensation calculation unit. FIG. [Diagram 3] FIG. 11 is a block diagram showing a configuration example of a single carrier transmission device according to a second embodiment. [Figure 4] 1A is a block diagram showing an example of the configuration of an amplitude-phase correction unit, and FIG. 1B is a diagram for explaining an example of calculation of an amplitude correction value by a comparison unit. [Diagram 5] FIG. 1 is a block diagram showing an example of the configuration of a typical single-carrier receiving device. [Figure 6] 1 is a diagram showing input / output characteristics (AM / AM (amplitude / amplitude) characteristics and AM / PM (amplitude / phase) characteristics) of a power amplifier. [Figure 7] FIG. 1 is a diagram showing a symbol block structure of an SC-FDE method. [Figure 8] FIG. 1 is a block diagram showing an example of the configuration of a conventional single-carrier transmission device (not compatible with DPD). [Figure 9] FIG. 1 is a block diagram showing an example configuration (assumed technology) when the DPD of Patent Document 2 is applied to a conventional single carrier transmission device (DPD compatible). [Figure 10] 4 is a block diagram showing an example of the configuration of an analog signal generating unit; FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0054] Hereinafter, the embodiments of the present invention will be described in detail with reference to the drawings. The single carrier transmission device of the first embodiment is characterized in that, by passing the entire signal of the SC-FDE block through a simulated transmission path, transmission path distortion is accurately simulated as in the conventional method, while the inverse characteristic of the transmission path distortion is added only to the IQ signal of the data among the signals of the SC-FDE block, and the inverse characteristic of the transmission path distortion is not added to the IQ signal of the UW.

[0055] This allows the transmission path distortion to be accurately simulated in the same way as in the conventional method, so that the same effect of DPD as in the conventional method can be maintained. Also, since the inverse characteristic of the transmission path distortion is not added to the UW, it is possible to reduce the PAPR of the entire signal of the SC-FDE block including the UW set to a high amplitude.

[0056] Therefore, the transmission power becomes higher than before, and the reception C / N margin on the receiving side can be secured, thereby improving the reception performance.

[0057] In addition, the single carrier transmission device of the second embodiment is characterized in that, in the single carrier transmission device of the first embodiment, for the data IQ signal of the SC-FDE block signal, an IQ signal that has been dynamically compensated is obtained by adding the inverse characteristic of the transmission path distortion, and for the UW IQ signal, an average value of the error of the UW IQ signal in which the transmission path distortion is simulated is obtained, and a statically compensated IQ signal is obtained based on the average value of the error.

[0058] This reduces the transmission path distortion for the IQ signals of the UW, and makes it possible to suppress the PAPR more than the assumed technique shown in Fig. 9. Therefore, similarly to the first embodiment, it is possible to improve the receiving performance.

[0059] [Single carrier transmission device / Example 1] First, a description will be given of a single carrier transmission apparatus according to a first embodiment of the present invention. Fig. 1 is a block diagram illustrating an example of the configuration of a single carrier transmission apparatus according to a first embodiment of the present invention.

[0060] This single carrier transmission device 1 includes a transmission pre-processing unit 110, a mapping unit 111, a UW signal generation unit 112, a time division switching synthesis unit 113, an upsampling unit 114, a waveform shaping unit 115, a dummy transmitter 130, a waveform shaping unit 131, a downsampling unit 132, a time division switching separation unit 10, a data signal IQ compensation calculation unit 11, a UW signal generation unit 12, a time division switching synthesis unit 13, a synchronization control unit 14, an analog signal generation unit 134, a power amplification unit 119 and a transmitting antenna 120.

[0061] The single carrier transmitting device 1 is a device that performs DPD processing in the SC-FDE scheme, which is different from the DPD of the assumed technology shown in Fig. 9. In other words, the single carrier transmitting device 1 is obtained by adding a configuration for performing new DPD processing (processing for adding the inverse characteristics of the transmission path distortion only to the IQ signal of the data, and not adding the inverse characteristics of the transmission path distortion to the IQ signal of the UW) to the configuration of the conventional single carrier transmitting device 100 shown in Fig. 8. Here, the transmission path distortion refers to nonlinear distortion due to the input / output characteristics in the power amplifier 119.

[0062] Since the single carrier transmission device 1 maintains the conventional SC-FDE scheme in the single carrier transmission devices 100, 101 shown in Fig. 8 and Fig. 9, it is possible to reduce the influence of nonlinear distortion in the transmission path without reducing the transmission capacity. Furthermore, since the single carrier transmission device 1 performs physical IQ signal processing, it is not dependent on the data signal modulation scheme and the UW generation scheme, and can achieve high versatility.

[0063] Comparing the single carrier transmission device 101 shown in Figure 9 with the single carrier transmission device 1 shown in Figure 1, both single carrier transmission devices 101, 1 have in common that they are equipped with a transmission pre-processing unit 110, a mapping unit 111, a UW signal generation unit 112, a time division switching synthesis unit 113, an upsampling unit 114, a waveform shaping unit 115, a dummy transmitter 130, a waveform shaping unit 131, a downsampling unit 132, an analog signal generation unit 134, a power amplification unit 119 and a transmitting antenna 120.

[0064] On the other hand, the single carrier transmitting device 1 differs from the single carrier transmitting device 101 which has a data signal IQ compensation calculation unit 133 in that it has a time division switching separation unit 10, a data signal IQ compensation calculation unit 11, a UW signal generation unit 12, a time division switching synthesis unit 13 and a synchronization control unit 14 (α in Figure 1).

[0065] The transmission pre-processing unit 110 inputs an information bit sequence to be transmitted (data to be transmitted), performs pre-processing such as energy dispersal processing, error correction coding processing, and interleaving processing on the information bit sequence, generates a coded bit sequence, and outputs the coded bit sequence to the mapping unit 111. Any energy dispersal processing, error correction coding processing, interleaving processing, etc. can be applied to this pre-processing.

[0066] The mapping unit 111 receives the coded bit sequence from the transmission pre-processing unit 110 and performs mapping on the coded bit sequence using a predetermined modulation method such as 16APSK or 32APSK to obtain an IQ signal. data Then, the mapping unit 111 generates an IQ signal of the mapped data. dataThe signal is output to the time division switching synthesis unit 113 and the data signal IQ compensation calculation unit 11. As a result, an IQ of an ideal signal arrangement in which no transmission line distortion is simulated (added) is obtained. data The signal is output to the data signal IQ compensation calculation unit 11. The transmission pre-processing unit 110 and the mapping unit 111 constitute a data signal generation unit.

[0067] The UW signal generator 112 generates a UW signal having a fixed pattern known between the single carrier transmitter 1 and the single carrier receiver 200 (to be described later), and calculates the IQ of the UW. UW The UW signal is output as a signal to the time division switching and combining unit 113. For the UW signal, a CAZAC (Constant Amplitude Zero Auto-Correlation) sequence, which has a constant amplitude in the time domain and the frequency domain such as a Zadoff-Chu sequence and has excellent periodic auto-correlation characteristics, can be used.

[0068] The time division switching and combining unit 113 receives the IQ signal mapped by the mapping unit 111. data The IQ signal is input from the UW signal generator 112. UW The time division switching and combining unit 113 receives an IQ signal and further receives a synchronous signal from a synchronous control unit 14, which will be described later. data Signal and IQ UW By synchronizing the switching operation with the signal input switching, IQ data For the signal symbols, IQ is set to a block unit of a specified number of symbols. UW Insert a signal.

[0069] For example, the time division switching and combining unit 113 performs IQ data Signal and IQ UW The signals are switched and combined in a time division manner to generate an SC-FDE block, and the SC-FDE block is output to upsampling section 114.

[0070] Upsampling unit 114 inputs the SC-FDE block from time division switching and combining unit 113, and performs upsampling on the symbols of the SC-FDE block by a predetermined number of times, which is equal to or greater than 2. Then, upsampling unit 114 outputs the upsampled SC-FDE block to waveform shaping unit 115. Here, for example, upsampling by 2 times is performed.

[0071] The waveform shaping unit 115 inputs the 2x upsampled SC-FDE block from the upsampling unit 114, and performs waveform shaping on the symbols of the 2x upsampled SC-FDE block by band-limiting filter processing. Then, the waveform shaping unit 115 outputs the waveform-shaped SC-FDE block to the dummy transmitter 130. A digital filter having a root roll-off characteristic is generally used as the band-limiting filter. Here, for example, a root roll-off filter with a roll-off rate of 0.1 is used.

[0072] The dummy transmitter 130 simulates an actual transmission path (power amplifier 119) on a digital signal, and reflects characteristic measurement data of the transmission path, etc. Here, for example, the input / output characteristics (AM / AM characteristics and AM / PM characteristics) of the power amplifier 119, which is the power amplifier shown in FIG. 6, are reflected. Also, like the power amplifier 119, the operating point is set within the input / output characteristics on the digital signal. For details, see the above-mentioned Non-Patent Document 2.

[0073] That is, the quasi-transmitter 130 receives the waveform-shaped SC-FDE block from the waveform shaping unit 115. Then, the quasi-transmitter 130 converts the amplitude and phase of the IQ signal so that the output power and phase transition correspond to the input power of the IQ signal of the received SC-FDE block, based on the input / output characteristics (preset input / output characteristics) of the power amplification unit 119, which is the power amplifier shown in Fig. 6, for example.

[0074] Pseudo transmitter 130 outputs to waveform shaping section 131 an SC-FDE block reflecting the input / output characteristics in power amplification section 119, that is, an SC-FDE block to which transmission path distortion has been pseudo-simulated (added).

[0075] This makes it possible to predict the shift of the IQ signal points due to passing through the transmission path (power amplifier 119) within the pseudo transmission path. However, the input signal in the actual transmission path is an analog signal whose waveform has been shaped by a root roll-off filter. For this reason, the input signal is passed through the pseudo transmitter 130 after undergoing digital signal processing from the upsampling unit 114, which processes signals from only symbol points to signals from non-symbol points, and the waveform shaping unit 115.

[0076] Then, IQ with DPD DPD_data In order to generate a signal, it is necessary to return the signal to a symbol point received by single carrier receiving apparatus 200 described later, and therefore it is necessary to pass the signal through dummy transmitter 130, followed by waveform shaping unit 131 and downsampling unit 132. That is, considering single carrier transmitting apparatus 1 and single carrier receiving apparatus 200 described later, upsampling unit 114, waveform shaping unit 115, dummy transmitter 130, waveform shaping unit 131 and downsampling unit 132 are assumed transmission paths for the IQ signal of the SC-FDE block.

[0077] The waveform shaping unit 131 is a component corresponding to the waveform shaping unit 115, and receives an SC-FDE block reflecting the input / output characteristics in the power amplification unit 119, i.e., an SC-FDE block in which transmission path distortion is simulated, from the pseudo transmitter 130. Then, the waveform shaping unit 131 performs waveform shaping on the SC-FDE block by band-limiting filter processing. Then, the waveform shaping unit 131 outputs the waveform-shaped SC-FDE block to the downsampling unit 132.

[0078] Downsampling unit 132 is a component corresponding to upsampling unit 114, and inputs the waveform-shaped SC-FDE block from waveform shaping unit 131, and performs downsampling of the symbols of the SC-FDE block by a predetermined number of times, which is equal to or greater than two. Then, downsampling unit 132 outputs the downsampled SC-FDE block to time division switching demultiplexing unit 10. Here, for example, two-times downsampling is performed.

[0079] The time division switching / demultiplexing unit 10 inputs the downsampled SC-FDE block from the downsampling unit 132, that is, the SC-FDE block in which transmission path distortion is simulated, and also inputs a synchronization signal from a synchronization control unit 14 described later.

[0080] The time division switching demultiplexing unit 10 extracts only the IQ signal of the data from the IQ signal constituting the SC-FDE block in which the transmission path distortion is simulated, based on the synchronization signal, and outputs this as an IQ channel_data The time division switching / separating unit 10 switches and separates the data IQ signal and the UW IQ signal from the IQ signal constituting the SC-FDE block to which the transmission path distortion has been added, based on the synchronization signal, and outputs the data IQ signal as an IQ signal to the data signal IQ compensation calculation unit 11. channel_data The time division switching / demultiplexing unit 10 outputs the IQ signal of UW as an IQ signal to the data signal IQ compensation calculation unit 11. channel_UW Output as a signal and discard.

[0081] As described above, in the assumed technique shown in Fig. 9, all IQ signals (data IQ signals and UW IQ signals) constituting an SC-FDE block are output to the data signal IQ compensation calculation unit 133 (corresponding to the data signal IQ compensation calculation unit 11 in Fig. 1). Therefore, there is a concern that the PAPR may become large.

[0082] In contrast, in the first embodiment, among all the IQ signals constituting the SC-FDE block, the IQ signal which is the data IQ signal is channel_dataOnly the IQ signal is output to the data signal IQ compensation calculation unit 11 and is the subject of compensation calculation. In this case, the IQ signal of UW channel_UW In other words, the IQ signal that is compensated for by the data signal IQ compensation calculation unit 11 is not a target for compensation calculation. channel_data signal, and the IQ (not compensated) generated by the UW signal generator 12 at the subsequent stage. UW The signal is power amplified in power amplifier 119 at the subsequent stage.

[0083] This allows the compensated IQ channel_data Signal and compensated IQ channel_UW An increase in PAPR can be suppressed more effectively than when the signal is power-amplified by power amplifier 119 (more effectively than the assumed technique shown in FIG. 9).

[0084] Here, the assumed transmission path from the upsampling unit 114 to the downsampling unit 132 is an IQ data IQ, which is the IQ signal of the signal and UW UW The time division switching / demultiplexing unit 10 processes an IQ signal, which is an IQ signal of data. channel_data The IQ compensation calculation unit 11 outputs only the IQ signal of UW. channel_UW Therefore, the assumed transmission path is data It may be possible to process only the signal.

[0085] However, the filters used in the waveform shaping units 115 and 131 perform waveform shaping in units of IQ signals of a plurality of symbols corresponding to the number of taps. data Signal and IQ UW In some cases, waveform shaping is performed on the signal, and the assumed transmission path is IQ data When only the signal is processed, it may not be possible to achieve correct waveform shaping.

[0086] Therefore, the assumed transmission path is IQ data Signal and IQ UWBy processing the signal, the waveform shaping units 115 and 131 can perform correct waveform shaping, and as a result, an SC-FDE block in which distortion close to actual transmission path distortion is simulated can be generated.

[0087] The data signal IQ compensation calculation unit 11 receives the IQ signal from the mapping unit 111, which does not have simulated transmission line distortion. data The signal is input, and the time division switching separation unit 10 outputs an IQ signal simulating transmission line distortion. channel_data Then, the data signal IQ compensation calculation unit 11 receives the IQ data Signal and IQ channel_data Using the signal, an IQ signal (error vector) reflecting the transmission line distortion is obtained, and the IQ data By adding the inverse characteristic of the transmission line distortion to the signal, DPD processing is performed to compensate for the transmission line distortion using vector calculations, and the IQ with DPD is DPD_data Signal (IQ with the inverse characteristic of the transmission line distortion added DPD_data The data signal IQ compensation calculation unit 11 generates an IQ DPD_data The signal is output to the time division switching and combining unit 13 .

[0088] 2 is a block diagram showing an example of the configuration of the data signal IQ compensation calculation unit 11. This data signal IQ compensation calculation unit 11 includes a delay unit 20, a vector calculation unit 21, an inverse characteristic coefficient unit 22, and a vector calculation unit .

[0089] The delay unit 20 outputs two IQ signals to be input to the vector calculation unit 21, which will be described later. data Signal and IQ channel_data The delay unit 20 is a component that adjusts the timing to synchronize the signals. The delay unit 20 also adjusts the IQ of two systems input to the vector calculation unit 23 (described later). data It is also a component that adjusts the timing to synchronize the signal and the IQ signal (error vector) that reflects the transmission line distortion.

[0090] The delay unit 20 receives the IQ signal from the mapping unit 111, which does not have the transmission line distortion simulated. data Input the signal and IQ dataThe signal is delayed by a preset delay amount D1, and the delayed IQ data_1 The delay unit 20 outputs the IQ signal to the vector calculation unit 21. data The signal is delayed by a preset delay amount D2, and the delayed IQ data_2 The signal is output to the vector calculation unit 23.

[0091] The time of the delay amount D1 is the same as the time of the delay amount caused by the processing between the time division switching synthesis unit 113 and the time division switching separation unit 10 shown in Fig. 1. The time of the delay amount D2 is the same as the time of the addition result obtained by adding the time of the delay amount caused by the processing of the vector calculation unit 21 and the inverse characteristic coefficient unit 22 shown in Fig. 2, which will be described later, to the time of the above-mentioned predetermined delay amount D1.

[0092] The vector calculation unit 21 receives from the delay unit 20 a delayed IQ signal in which no transmission line distortion has been simulated. data_1 The signal is input, and the time division switching separation unit 10 outputs an IQ signal simulating transmission line distortion. channel_data Then, the vector calculation unit 21 calculates the IQ channel_data Signal to IQ data_1 The vector calculation unit 21 calculates an error vector in which the transmission line distortion caused by passing through the transmission line is reflected by performing a vector calculation for subtracting the signal. The vector calculation unit 21 outputs the error vector in which the transmission line distortion is reflected to the inverse characteristic coefficient unit 22.

[0093] The inverse characteristic coefficient unit 22 inputs the error vector reflecting the transmission line distortion from the vector calculation unit 21, and multiplies the error vector by a preset inverse characteristic coefficient to obtain an error vector after multiplication by the inverse characteristic coefficient reflecting the transmission line distortion. The inverse characteristic coefficient unit 22 outputs the error vector after multiplication by the inverse characteristic coefficient to the vector calculation unit 23. For example, as in the case of Non-Patent Document 2, a value of 1 is used as the inverse characteristic coefficient.

[0094] The vector calculation unit 23 receives the delayed IQ from the delay unit 20. data_2 The vector calculation unit 23 receives the IQdata_2 By performing vector arithmetic to subtract the error vector from the signal, IQ with DPD is DPD_data Signal (IQ with the inverse characteristic of the transmission line distortion added DPD_data signal), and IQ DPD_data The signal is output to the time division switching and combining unit 13 .

[0095] Returning to FIG. 1, the UW signal generator 12, like the UW signal generator 112, generates a UW signal having a known fixed pattern between the single carrier transmitter 1 and the single carrier receiver 200 described later, and outputs an IQ UW The UW signal generator 12 outputs the signal as a signal to the time division switch combiner 13. The UW signal generator 12 and the UW signal generator 112 may be one common component.

[0096] The time division switching synthesis unit 13 receives the IQ from the data signal IQ compensation calculation unit 11. DPD_data The IQ signal is input from the UW signal generator 12. UW The time division switching and combining unit 13 receives an IQ signal and further receives a synchronous signal from a synchronous control unit 14, which will be described later. DPD_data Signal and IQ UW By synchronizing the switching operation with the signal input switching, IQ DPD_data For the signal symbols, IQ is set to a block unit of a specified number of symbols. UW Insert a signal.

[0097] For example, the time division switching and combining unit 13 performs IQ DPD_data Signal and IQ UW The signals are switched and combined in a time division manner to generate an SC-FDE block, and the SC-FDE block is output to the analog signal generation unit 134.

[0098] Here, IQ DPD_data Since the signal is a signal to which the inverse characteristics of the transmission path distortion have been dynamically added, by using a synchronization signal from the synchronization control unit 14, the time division switching synthesis unit 13 can be operated in a manner that synchronizes switching with the previous time division switching synthesis unit 113.

[0099] The synchronization control unit 14 generates a synchronization signal for causing the time division switching synthesis unit 113, the time division switching separation unit 10, and the time division switching synthesis unit 13 to perform switching control while maintaining synchronization. The synchronization control unit 14 outputs the synchronization signal to the time division switching synthesis unit 113, the time division switching separation unit 10, and the time division switching synthesis unit 13.

[0100] Specifically, the synchronization control unit 14 synchronizes the input switching of the time division switching synthesis unit 113, the output switching of the time division switching separation unit 10, and the switching operation of the input switching of the time division switching synthesis unit 13, and generates a synchronization signal for generating a series of IQ signals that constitute the SC-FDE block shown in Figure 7.

[0101] The analog signal generator 134 receives the SC-FDE block from the time division switching combiner 13. The analog signal generator 134 then performs predetermined analog signal generation processing (upsampling, waveform shaping, quadrature modulation, DA conversion, and frequency conversion processing) shown in FIG. 10 on the SC-FDE block to generate a radio frequency modulated signal. The analog signal generator 134 then outputs the radio frequency modulated signal to the power amplifier 119.

[0102] The power amplifier 119 inputs a radio frequency modulated signal from the analog signal generator 134, amplifies the power of the radio frequency modulated signal so that the modulated signal has a specified power, and transmits the radio frequency modulated wave via the transmitting antenna 120.

[0103] Generally, the power amplifier 119 has a nonlinear input / output characteristic as shown in Fig. 6. By operating the power amplifier 119 in a nonlinear high output region, it is possible to improve power efficiency and ensure a C / N margin on the receiving side. For this reason, in the first embodiment and the second embodiment described later, the power amplifier 119 is configured to operate in the high output region.

[0104] As described above, according to the single carrier transmission device 1 of the first embodiment, the assumed transmission path consisting of the upsampling unit 114, the waveform shaping unit 115, the dummy transmitter 130, the waveform shaping unit 131, and the downsampling unit 132 has an IQ data Signal and IQ UW An SC-FDE block containing a signal is upsampled and waveform shaped to simulate transmission path distortion (reflecting the input / output characteristics in the power amplifier 119), and then waveform shaping and downsampling are performed to generate an SC-FDE block with simulated transmission path distortion (an SC-FDE block reflecting the input / output characteristics in the power amplifier 119).

[0105] The time division switching demultiplexing unit 10 extracts an IQ signal from the IQ signal constituting the SC-FDE block in which the transmission path distortion is simulated. channel_data Signal and IQ channel_UW The signals are switched and separated in a time division manner, and the IQ channel_UW Discard the signal.

[0106] The data signal IQ compensation calculation unit 11 calculates an IQ signal having a simulated transmission line distortion. channel_data IQ where signal and transmission line distortion are not simulated data Calculate the transmission line distortion from the signal and calculate the IQ data By adding the inverse characteristic of the transmission line distortion to the signal, the transmission line distortion is compensated for (IQ data DPD is applied to the signal, and IQ with DPD is DPD_data Signal (IQ with the inverse characteristic of the transmission line distortion added DPD_data signal).

[0107] The time division switching synthesis unit 13 is an IQ with DPD. DPD_data IQ without signal and DPD UW The signals are switched in a time-division manner and combined to generate an SC-FDE block.

[0108] The SC-FDE block is then subjected to predetermined processing in analog signal generating section 134 and power amplifying section 119, and transmitted via transmitting antenna 120 as a modulated wave.

[0109] This results in IQ with DPDDPD_data Since the signal is power-amplified in power amplifier 119, the effect of DPD can be maintained similar to that of the conventional method.

[0110] Also, IQ without DPD UW Since the signal is power-amplified by the power amplifier 119, the peak value of the entire signal can be reduced and the PAPR can be suppressed, compared to the case where the IQ signal with DPD is power-amplified by the power amplifier 119 (the assumed technology shown in FIG. 9). This increases the transmission power, making it possible to secure a higher reception C / N margin on the receiving side, and improving the reception characteristics.

[0111] For example, the transmission parameters in the SC-FDE block are a UW signal (Zadoff-Chu sequence) boost ratio of 1.35, a roll-off rate of 0.1, a data signal modulation method of 32APSK (error correction code coding rate: 1 / 2), the characteristics of the power amplifier 119, which is the transmission line, are the input / output characteristics shown in FIG. 6, the operating point is set at an input power equivalent to P1 dB, and performance evaluation is performed by calculation. As a result, when the DPD of the assumed technology shown in FIG. 9 is used, the required C / N is 1.38 dB, and the power reduction amount when the unmodulated wave power is used as a reference is 1.48 dB. In contrast, when the DPD of the embodiment of the present invention shown in FIG. 1 is used, the required C / N is 1.30 dB, and the power reduction amount is 1.40 dB, and a superiority difference of 0.08 dB in the required C / N and 0.08 dB in the power reduction amount was obtained.

[0112] Therefore, while maintaining the same effect of DPD as conventional methods, it is possible to reduce the PAPR of the entire signal of the SC-FDE block including the UW set to a high amplitude, and it is expected that the performance of nonlinear transmission in the SC-FDE method will be improved. This allows the transmission power to be higher than conventional methods, and the receiving C / N margin on the receiving side can be secured, thereby improving the receiving performance.

[0113] [Single carrier transmission device / Example 2] Next, a description will be given of a single carrier transmission apparatus according to a second embodiment of the present invention. Fig. 3 is a block diagram illustrating an example of the configuration of a single carrier transmission apparatus according to a second embodiment of the present invention.

[0114] This single carrier transmission device 2 includes a transmission pre-processing unit 110, a mapping unit 111, a UW signal generation unit 112, a time division switching synthesis unit 113, an upsampling unit 114, a waveform shaping unit 115, a dummy transmitter 130, a waveform shaping unit 131, a downsampling unit 132, a time division switching separation unit 10, a data signal IQ compensation calculation unit 11, an amplitude and phase correction unit 15, a time division switching synthesis unit 13, a synchronization control unit 14, an analog signal generation unit 134, a power amplification unit 119 and a transmitting antenna 120.

[0115] Comparing the single carrier transmitting device 1 of Example 1 shown in Figure 1 with the single carrier transmitting device 2 of Example 2, both single carrier transmitting devices 1 and 2 have in common the fact that they are equipped with a transmission pre-processing unit 110, a mapping unit 111, a UW signal generating unit 112, a time division switching synthesis unit 113, an upsampling unit 114, a waveform shaping unit 115, a dummy transmitter 130, a waveform shaping unit 131, a downsampling unit 132, a time division switching separation unit 10, a data signal IQ compensation calculation unit 11, a time division switching synthesis unit 13, a synchronization control unit 14, an analog signal generating unit 134, a power amplification unit 119 and a transmitting antenna 120.

[0116] On the other hand, the single carrier transmission device 2 differs from the single carrier transmission device 1 equipped with the UW signal generation unit 12 in that the single carrier transmission device 2 is equipped with an amplitude phase correction unit 15 .

[0117] The single carrier transmission device 1 of the first embodiment receives an IQ signal of UW outputted from a time division switching / demultiplexing unit 10. channel_UW The IQ signal is discarded and the transmission line distortion generated by the UW signal generator 12 is not simulated. UW In contrast, the single carrier transmission device 2 of the second embodiment generates an SC-FDE block and generates a modulated signal using an IQ channel_UW The amplitude and phase correction unit 15 corrects the IQ channel_UWThe average value of the signal amplitude and phase errors is detected, and the amplitude and phase correction values ​​are calculated from the average error values ​​to obtain a statically compensated IQ. DPD_UW Looking for a signal, this IQ DPD_UW The signal is used to generate an SC-FDE block and generate a modulated signal.

[0118] The components from the transmission pre-processing unit 110 to the downsampling unit 132, the synchronization control unit 14, the analog signal generating unit 134, and the power amplifying unit 119 perform the same processing as the components shown in Fig. 1. Here, the waveform shaping unit 115 outputs information on the input / output characteristics of the power amplifying unit 119 that has been set in advance (including information on the input / output characteristics of the UW) to the amplitude / phase correcting unit 15.

[0119] 1, the time division switching demultiplexing unit 10 receives an SC-FDE block in which transmission path distortion has been simulated from the downsampling unit 132 and receives a synchronization signal from the synchronization control unit 14. Then, based on the synchronization signal, the time division switching demultiplexing unit 10 extracts an IQ signal, which is an IQ signal of data, from the IQ signal constituting the SC-FDE block in which transmission path distortion has been simulated. channel_data The signal is extracted and the IQ signal of UW is channel_UW Extract the signal.

[0120] The time division switching separation unit 10 is an IQ channel_data The signal is output to the data signal IQ compensation calculation unit 11, and the IQ channel_UW The signal is output to the amplitude / phase correction unit 15 without being discarded.

[0121] The amplitude and phase correction unit 15 receives an IQ signal with a simulated transmission line distortion from the time division switching separation unit 10. channel_UW Along with inputting the signal, information on the input / output characteristics in the power amplifier 119 is also inputted from the waveform shaping section 115 .

[0122] The amplitude and phase correction unit 15 is channel_UW Signal amplitude and phase errors (IQ where transmission line distortion is not simulated) UWThe amplitude-phase correction unit 15 detects the average values ​​of the errors between the IQ signal and the phase signal, i.e., the amplitude distortion and the phase distortion, and compares these average values ​​with the input / output characteristics of the power amplifier 119 to obtain optimal amplitude correction values ​​and phase correction values. UW IQ with static compensation by adding amplitude and phase corrections to the signal DPD_UW Signal (IQ where the inverse characteristic of the transmission line distortion is statically added DPD_UW The amplitude and phase correction unit 15 calculates the IQ DPD_UW The signal is output to the time division switching combiner 13. It is assumed that the information on the input / output characteristics of the power amplifier 119 input from the waveform shaping unit 115 includes the input / output characteristics of the UW in the power amplifier 119.

[0123] 4(1) is a block diagram showing an example of the configuration of the amplitude and phase correction unit 15. This amplitude and phase correction unit 15 includes a UW signal amplitude and phase error detection unit 30, a comparison unit 31, and a UW correction signal generation unit 32.

[0124] The UW signal amplitude and phase error detection unit 30 receives an IQ signal having a simulated transmission line distortion from the time division switching separation unit 10. channel_UW Then, the UW signal amplitude and phase error detection unit 30 receives the IQ channel_UW A signal and an IQ that is a known fixed pattern between the single carrier transmitting device 2 and the single carrier receiving device 200 described later. UW Signal (IQ generated by UW signal generator 112 UW 6. The ideal output signal of power amplifier 119 corresponding to the ideal AM / PM characteristic a and the ideal AM / PM characteristic c in the example of FIG. 6 is compared with the ideal output signal of power amplifier 119 corresponding to the ideal AM / PM characteristic a and the ideal AM / PM characteristic c in the example of FIG.

[0125] The UW signal amplitude and phase error detection unit 30 detects the IQ in the SC-FDE block by comparison. channel_UW The amplitude error of all symbols that make up the signal is detected and the average value is calculated. This is called the IQ channel_UW The UW signal amplitude and phase error detection unit 30 compares the IQ of the SC-FDE block to determine the average amplitude distortion of the signal. channel_UWThe phase error of all symbols that make up the signal is detected and the average value is calculated, and this is called the IQ. channel_UW This is the average value of the phase distortion of the signal.

[0126] The UW signal amplitude and phase error detection unit 30 detects the IQ channel_UW The average value of the amplitude distortion and the average value of the phase distortion of the signal are output to the comparison section 31 .

[0127] The comparator 31 receives the IQ from the UW signal amplitude and phase error detector 30. channel_UW The average value of the amplitude distortion and the average value of the phase distortion of the signal are input, and information on the input / output characteristics of the power amplifier 119 (including information on the input / output characteristics of the UW) is input from the waveform shaping section 115 .

[0128] The comparison unit 31 is an IQ channel_UW The average value of the amplitude distortion and the average value of the phase distortion of the signal are compared with the input / output characteristics of the UW in the power amplifier 119 (the error between the ideal input / output characteristics and the actual input / output characteristics) to determine optimal amplitude correction values ​​and phase correction values.

[0129] That is, the comparator 31 uses the ideal input / output characteristics and the actual input / output characteristics of the UW in the power amplifier 119 to calculate the IQ channel_UW An operating point corresponding to the average value of the amplitude distortion and the average value of the phase distortion of the signal is identified, and an amplitude correction value and a phase correction value (input characteristics) corresponding to the average value of the amplitude distortion and the average value of the phase distortion (output characteristics) are obtained in the actual input / output characteristics of the UW. The comparison unit 31 outputs the amplitude correction value and the phase correction value to the UW correction signal generation unit 32.

[0130] Here, the ideal input / output characteristics of the UW are the ideal AM / AM characteristics and AM / PM characteristics of the UW, and the actual input / output characteristics of the UW are the actual AM / AM characteristics and AM / PM characteristics of the UW.

[0131] Fig. 4(2) is a diagram for explaining an example of calculation of an amplitude correction value by comparison unit 31. The horizontal axis indicates input power, and the vertical axis indicates output power. a' indicates the characteristic of the ideal average value of output power versus the average value of UW input power in power amplifier 119 (ideal AM / AM characteristic), and b' indicates the characteristic of the actual average value of output power versus the average value of UW input power in power amplifier 119 (actual AM / AM characteristic). The numerical values ​​of input power and output power are determined for the sake of convenience in order to explain an example of calculation of an amplitude correction value.

[0132] IQ where transmission line distortion is not simulated UW Signal amplitude (average value) is 1.35, IQ where transmission line distortion is not simulated UW The amplitude (average value) of the ideal output signal of the power amplifier 119 corresponding to the signal is assumed to be 1.35. channel_UW The amplitude (average value) of the signal is 1.34. In this case, the IQ detected by the UW signal amplitude and phase error detection unit 30 is channel_UW The average amplitude distortion of the signal is 0.01.

[0133] The comparator 31 compares the IQ input from the UW signal amplitude and phase error detector 30. channel_UW The average value (0.01) of the amplitude distortion of the signal is compared with the error between the ideal AM / AM characteristic a' and the actual AM / AM characteristic b' of the UW shown in FIG. 4(2) input from the waveform shaping unit 115, and the operating points α and β at which the average value (0.01) of the amplitude distortion and the error match are identified. In other words, the comparator 31 uses the ideal AM / AM characteristic a' and the actual AM / AM characteristic b' of the UW shown in FIG. 4(2) to calculate the IQ channel_UW The operating points α and β corresponding to the average value (0.01) of the amplitude distortion of the signal are identified.

[0134] The comparison unit 31 identifies an operating point γ in the actual AM / AM characteristics b' of the UW that corresponds to the output power (1.35) of operating point β in the ideal AM / AM characteristics a' of the UW, and extracts the input power (1.38) of operating point γ from the actual AM / AM characteristics b' of the UW.

[0135] The comparator 31 calculates an IQ UW The signal amplitude (average value) (1.35) is subtracted to obtain an amplitude correction value (0.03). That is, using operating point α at the actual AM / AM characteristic b' of the UW as a reference, comparison unit 31 obtains the difference (0.03) in input power at the actual AM / AM characteristic b' of the UW that corresponds to the difference (average value of amplitude distortion) between the output power (1.34) at operating point α and the output power (1.35) at operating point β at the ideal AM / AM characteristic a' of the UW, and uses this difference as the amplitude correction value. In other words, by grasping the actual AM / AM characteristic b' of the UW in advance, comparison unit 31 obtains an amplitude correction value (input power) that corresponds to the average value of amplitude distortion (output power).

[0136] Similarly, the comparison unit 31 determines the ideal AM / PM characteristics of the UW in the power amplifier unit 119 and the actual AM / PM characteristics of the UW in advance, channel_UW A value corresponding to the average value of the phase distortion of the signal (for example, a value obtained by inverting the sign of the average value of the phase distortion) can be obtained as the phase correction value.

[0137] Returning to FIG. 4(1), the UW correction signal generation unit 32 receives the amplitude correction value and the phase correction value from the comparison unit 31. Then, the UW correction signal generation unit 32 generates an IQ correction signal that is a known fixed pattern between the single carrier transmission device 2 and the single carrier reception device 200 described later. UW Signal (IQ generated by UW signal generator 112 UW The amplitude correction value is added to the amplitude of the IQ signal. UW IQ with static compensation by adding a phase correction value to the signal phase DPD_UW Signal (IQ where the inverse characteristic of the transmission line distortion is statically added DPD_UW The UW correction signal generator 32 calculates the IQ DPD_UW The signal is output to the time division switching and combining unit 13 .

[0138] Returning to FIG. 3, the time division switching synthesis unit 13 receives the IQ with DPD from the data signal IQ compensation calculation unit 11. DPD_data Signal (IQ with the inverse characteristic of the transmission line distortion addedDPD_data signal) and an IQ signal with DPD from the amplitude and phase correction unit 15. DPD_UW Signal (IQ where the inverse characteristic of the transmission line distortion is statically added DPD_UW signal) and further receives a synchronization signal from synchronization control unit 14.

[0139] The time division switching synthesis unit 13, like the time division switching synthesis unit 13 shown in FIG. 1, performs IQ DPD_data Signal and IQ DPD_UW The switching action is synchronized with the signal input switching, DPD_data For the signal symbols, IQ is set to a block unit of a specified number of symbols. DPD_UW By inserting a signal (IQ DPD_data Signal and IQ DPD_UW The time division switching and combining unit 13 outputs the SC-FDE block to the analog signal generating unit 134.

[0140] As a result, while the single carrier transmission device 1 shown in Fig. 1 corrects only the data signal, the single carrier transmission device 2 shown in Fig. 3 can correct the UW signal in addition to the data signal in Fig. 1. Then, such an SC-FDE block is modulated and transmitted as a modulated wave via the transmission antenna 120.

[0141] As described above, according to the single carrier transmission device 2 of the second embodiment, the assumed transmission path consisting of the upsampling unit 114, the waveform shaping unit 115, the dummy transmitter 130, the waveform shaping unit 131, and the downsampling unit 132 has an IQ data Signal and IQ UW An SC-FDE block containing a signal is upsampled and waveform shaped to simulate transmission path distortion (reflecting the input / output characteristics in the power amplifier 119), and then waveform shaping and downsampling are performed to generate an SC-FDE block with simulated transmission path distortion (an SC-FDE block reflecting the input / output characteristics in the power amplifier 119).

[0142] The time division switching demultiplexing unit 10 extracts an IQ signal from the IQ signal constituting the SC-FDE block in which the transmission path distortion is simulated. channel_data Signal and IQ channel_UW The signals are separated by switching them in a time division manner.

[0143] The data signal IQ compensation calculation unit 11 calculates an IQ signal having a simulated transmission line distortion in the same manner as in the first embodiment. channel_data IQ where signal and transmission line distortion are not simulated data Using the signal, IQ with DPD DPD_data Signal (IQ with the inverse characteristic of the transmission line distortion added DPD_data signal).

[0144] The amplitude and phase correction unit 15 is an IQ channel_UW The average values ​​of the amplitude distortion and phase distortion of the signal are detected, and an amplitude correction value and a phase correction value are calculated from the average values ​​of the amplitude distortion and phase distortion using the input / output characteristics in the power amplifier 119. UW IQ with static compensation by adding amplitude and phase corrections to the signal amplitude and phase DPD_UW Signal (IQ where the inverse characteristic of the transmission line distortion is statically added DPD_UW signal).

[0145] The time division switching synthesis unit 13 is an IQ with DPD. DPD_data IQ with signal and DPD DPD_UW The signals are switched in a time-division manner and combined to generate an SC-FDE block.

[0146] The SC-FDE block is then subjected to predetermined processing in analog signal generating section 134 and power amplifying section 119, and transmitted via transmitting antenna 120 as a modulated wave.

[0147] As a result, in Example 2, as in Example 1, the IQ with DPD DPD_data Since the signal is power-amplified in power amplifier 119, the effect of DPD can be maintained similar to that of the conventional method.

[0148] In addition, in Example 2, unlike Example 1, the IQ with DPD DPD_UW Since the signal is power-amplified by the power amplifier 119, it is possible to reduce channel distortion for the IQ signal of the UW as well as the IQ signal of the data. Therefore, it is possible to improve the accuracy of channel estimation compared to the first embodiment.

[0149] Example 2 shows the IQ with statically compensated DPD. DPD_UW Since the signal is power-amplified by the power amplifier 119, it is possible to prevent the PAPR from becoming excessively large, compared to the case where an IQ signal with DPD that has been dynamically compensated is power-amplified by the power amplifier 119 (the assumed technology shown in FIG. 9). This increases the transmission power, making it possible to secure a higher reception C / N margin on the receiving side, and further improving the reception characteristics.

[0150] Therefore, as in the first embodiment, while maintaining the same effect of DPD as in the conventional method, the PAPR of the entire signal of the SC-FDE block including the UW set to a high amplitude is reduced compared to that in FIG. 9, thereby improving the reception performance.

[0151] [Single carrier receiving device] Next, a single carrier receiving device that receives modulated waves transmitted from the single carrier transmitting device 1 of the first embodiment shown in Fig. 1 and the single carrier transmitting device 2 of the second embodiment shown in Fig. 3 will be described. This single carrier receiving device is a general device, and is configured as a receiving device of the SC-FDE system that receives modulated waves transmitted from the single carrier transmitting devices 1 and 2 and performs channel equalization in the frequency domain.

[0152] 5 is a block diagram showing an example of the configuration of a general single-carrier receiving device. This single-carrier receiving device 200 includes a receiving antenna 210, a frequency conversion unit 211, an AD conversion unit 212, an orthogonal demodulation unit 213, a waveform shaping unit 214, a block synchronization unit 215, a UW Fourier transform unit 216, a channel estimation unit 217, a Fourier transform unit 218, a frequency domain equalization unit 219, an inverse Fourier transform unit 220, a demapping unit 221, and a decoding unit 222.

[0153] Note that single carrier receiving apparatus 200 in FIG. 5 can also be configured as an SC-FDE receiving apparatus with two or more receiving branches that enable diversity combining, but an example in which the number of receiving branches is one will be described here.

[0154] When single carrier receiving device 200 receives a modulated radio signal transmitted from single carrier transmitting devices 1 and 2, frequency conversion unit 211 converts the radio frequency of the modulated wave received via receiving antenna 210 to an intermediate frequency, and outputs the intermediate frequency signal to AD conversion unit 212.

[0155] The AD conversion section 212 receives the intermediate frequency signal from the frequency conversion section 211 , converts the intermediate frequency analog signal into a digital signal, and outputs the digital signal to the orthogonal demodulation section 213 .

[0156] The orthogonal demodulation unit 213 receives the digital signal from the AD conversion unit 212, performs automatic frequency control on the digital signal, and generates a orthogonally demodulated complex baseband signal while correcting the frequency shift. The orthogonal demodulation unit 213 outputs the frequency-corrected complex baseband signal to the waveform shaping unit 214.

[0157] The waveform shaping unit 214 receives the frequency-corrected complex baseband signal from the orthogonal demodulation unit 213, performs waveform shaping on the complex baseband signal by band-limiting filter processing, and outputs the waveform-shaped complex baseband signal to the block synchronization unit 215. A digital filter having a root roll-off characteristic is generally used as the band-limiting filter. Here, for example, a root roll-off filter with a roll-off rate of 0.1 is used.

[0158] Block synchronization unit 215 receives the waveform-shaped complex baseband signal from waveform shaping unit 214, detects synchronization timing of the SC-FDE block from the complex baseband signal based on the IQ signal of the UW part included in the SC-FDE block, and extracts a time domain signal related to the leading UW part and a time domain signal related to the subsequent data and UW part at double speed. Then, block synchronization unit 215 outputs the SC-FDE block for which synchronization timing has been detected to UW Fourier transform unit 216 and Fourier transform unit 218.

[0159] The UW Fourier transform unit 216 inputs the SC-FDE block for which synchronization timing has been detected from the block synchronization unit 215. Then, the UW Fourier transform unit 216 performs a Fourier transform on a time domain signal related to the leading UW part included in the SC-FDE block, and outputs a frequency domain signal related to the leading UW part to the channel estimation unit 217.

[0160] Channel estimation unit 217 receives the frequency domain signal related to the leading UW portion from UW Fourier transform unit 216. Then, channel estimation unit 217 uses a preset known frequency domain UW signal as a reference signal and performs channel estimation using the frequency domain signal related to the leading UW portion and the reference signal. Channel estimation unit 217 outputs propagation path information obtained by channel estimation to frequency domain equalization unit 219.

[0161] The Fourier transform unit 218 receives the SC-FDE block for which synchronization timing has been detected from the block synchronization unit 215. Then, the Fourier transform unit 218 performs a Fourier transform on a time domain signal relating to the data included in the SC-FDE block and the subsequent UW part, and outputs a frequency domain signal relating to the data and UW part to the frequency domain equalization unit 219.

[0162] The frequency domain equalization unit 219 inputs the propagation path information from the channel estimation unit 217, and also inputs the frequency domain signal related to the data and UW portions from the Fourier transform unit 218. Then, the frequency domain equalization unit 219 performs channel equalization processing in the frequency domain using the propagation path information and the frequency domain signal related to the data and UW portions. The frequency domain equalization unit 219 outputs the channel-equalized frequency domain signal related to the data and UW portions to the inverse Fourier transform unit 220.

[0163] The inverse Fourier transform unit 220 receives the channel-equalized data and the frequency domain signal related to the UW portion from the frequency domain equalization unit 219. Then, the inverse Fourier transform unit 220 performs an inverse Fourier transform on the channel-equalized data and the frequency domain signal related to the UW portion, and outputs the time domain signal related to the data and the UW portion to the demapping unit 221.

[0164] The demapping unit 221 inputs the time domain signal relating to the data and UW portions from the inverse Fourier transform unit 220, and extracts the time domain signal of data from the time domain signal relating to the data and UW portions. The demapping unit 221 then performs symbol determination by performing demapping and likelihood calculation on the time domain signal of data, and generates an information bit sequence (data on which error correction coding has been performed) constituting a symbol. The demapping unit 221 outputs the information bit sequence (data on which error correction coding has been performed) to the decoding unit 222.

[0165] Here, since the single carrier receiving apparatus 200 receives a modulated wave that has been subjected to DPD processing, the influence of transmission path distortion is reduced, and as a result, an improvement in performance up to symbol determination can be expected.

[0166] The decoding unit 222 inputs an information bit sequence (data on which error correction coding has been performed) from the demapping unit 221. Then, the decoding unit 222 performs deinterleaving processing, error correction decoding processing, energy despreading processing, and the like corresponding to the transmission pre-processing units 110 of the single carrier transmission devices 1 and 2, decodes the information bit sequence, and generates and outputs the original data.

[0167] As a result, single carrier receiving apparatus 200 can receive modulated waves that have been subjected to DPD processing and transmitted from single carrier transmitting apparatuses 1 and 2, i.e., modulated waves in which the effects of transmission path distortion have been reduced. Then, single carrier receiving apparatus 200 performs channel equalization in the frequency domain, and can acquire the original data with high accuracy.

[0168] Although the present invention has been described above with reference to the first and second embodiments, the present invention is not limited to the first and second embodiments, and various modifications are possible without departing from the technical concept thereof. [Explanation of symbols]

[0169] 1,2,100,101 Single carrier transmitter 10 Time division switching separation section 11,133 Data signal IQ compensation calculation section 12,112 UW signal generator 13,113 Time division switching synthesis section 14 Synchronization control section 15 Amplitude and phase correction section 20 Delay section 21,23 Vector Calculation Unit 22 Inverse characteristic coefficient section 30 UW signal amplitude and phase error detection section 31 Comparison section 32 UW correction signal generator 110 Pre-transmission processing unit 111 Mapping Section 114,140 Upsampling section 115,131,141,214 Waveform shaping section 116,142 Quadrature modulation section 117,143 DA conversion section 118,144 Frequency conversion section 119 Power Amplifier 120 Transmitting Antenna 130 Pseudo transmitter 132 Downsampling section 134 Analog signal generator 200 Single carrier receiving device 210 Receiving antenna 211 Frequency conversion unit 212 AD conversion section 213 Quadrature demodulation section 215 Block Synchronization Unit 216 UW Fourier Transformation Section 217 Channel Estimation Unit 218 Fourier Transform Section 219 Frequency domain equalizer 220 Inverse Fourier Transform 221 Demapping section 222 Decoding section

Claims

1. 1. A single carrier transmission device that generates an SC-FDE block including data to be transmitted and a unique word (UW) for channel estimation, modulates a signal of the SC-FDE block, amplifies the power of the signal in a power amplifier, and transmits a modulated wave, Mapping is performed on the coded bit sequence of the data to be transmitted using a predetermined modulation method, and an IQ data a data signal generating unit that generates a signal; The UW signal, which is a known fixed pattern, is UW a UW signal generating unit for generating a UW signal; The IQ generated by the data signal generating unit data signal and the IQ generated by the UW signal generator UW a first time division switching and combining unit that generates a first SC-FDE block by switching and combining the signals in a time division manner; a pseudo transmitter that simulates a transmission path distortion in which the power amplifier unit serves as a transmission path by reflecting an input / output characteristic of the power amplifier unit in the SC-FDE block generated by the first time division switching and combining unit, and outputs a second SC-FDE block; The IQ of the data in which the transmission path distortion is simulated from the second SC-FDE block output by the pseudo transmitter channel_data IQ of UW with simulated signal and transmission line distortion channel_UW a time division switching / separating unit for switching and separating the signals in a time division manner; The IQ generated by the data signal generating unit data The IQ signal separated by the time division switching separation unit channel_data and calculating an error vector between the IQ data By adding the inverse characteristic of the transmission line distortion to the signal, the IQ DPD_data a data signal IQ compensation calculation unit that generates a signal; The IQ generated by the data signal IQ compensation calculation unit DPD_data signal and the IQ generated by the UW signal generator UW a second time division switching and combining unit that generates a third SC-FDE block by switching and combining the signals in a time division manner; an analog signal generating unit that performs upsampling, waveform shaping, quadrature modulation, DA conversion, and frequency conversion on the third SC-FDE block generated by the second time division switching and combining unit to generate an analog signal; the power amplifier unit performing power amplification on the analog signal generated by the analog signal generator; A single carrier transmission device comprising:

2. 2. The single carrier transmission apparatus according to claim 1, The data signal IQ compensation calculation unit includes: The IQ generated by the data signal generating unit data The signal is delayed by a preset delay amount D1, and the delayed IQ data_1 The signal is output and delayed by a preset delay amount D2. data_2 A delay unit that outputs a signal; The IQ separated by the time division switching separation unit channel_data The IQ output from the delay unit data_1 a first vector calculation unit that subtracts signals to obtain the error vector; an inverse characteristic coefficient unit that multiplies the error vector calculated by the first vector calculation unit by a preset inverse characteristic coefficient to calculate an error vector after multiplication; The IQ output by the delay unit data_2 The error vector after the multiplication obtained by the inverse characteristic coefficient unit is subtracted from the IQ signal. DPD_data A second vector calculation unit that obtains a signal; A single carrier transmission device comprising:

3. A single carrier transmission device that generates an SC-FDE block including data to be transmitted and a UW (unique word) for channel estimation, modulates the signal of the SC-FDE block, amplifies the power of the signal in a power amplifier, and transmits a modulated wave, A data signal generating unit that performs mapping on the coded bit sequence of the data to be transmitted using a predetermined modulation method to generate an IQ data signal; a UW signal generating unit that generates the UW signal having a known fixed pattern as an IQ UW signal; a first time division switching and combining unit that generates a first SC-FDE block by switching and combining the IQ data signal generated by the data signal generating unit and the IQ UW signal generated by the UW signal generating unit in a time division manner; a pseudo transmitter that simulates a transmission path distortion in which the power amplifier unit serves as a transmission path by reflecting an input / output characteristic of the power amplifier unit in the SC-FDE block generated by the first time division switching and combining unit, and outputs a second SC-FDE block; a time division switching and separating unit that switches and separates, in a time division manner, an IQ channel_data signal of data in which a transmission path distortion is simulated and an IQ channel_UW signal of UW in which a transmission path distortion is simulated from the second SC-FDE block output by the pseudo transmitter; a data signal IQ compensation calculation unit that calculates an error vector between the IQ data signal generated by the data signal generation unit and the IQ channel_data signal separated by the time division switching separation unit, and generates an IQ DPD_data signal by adding an inverse characteristic of a transmission line distortion to the IQ data signal based on the error vector; The IQ separated by the time division switching separation unit channel_UW signal and the IQ generated by the UW signal generator UW Based on the signal, the IQ channel_UW An average value of an error of a signal is detected, and a correction value is calculated from the average value of the error using an input / output characteristic of the power amplifier unit. UW By correcting the signal, IQ DPD_UW an amplitude and phase correction unit that generates a signal; The IQ generated by the data signal IQ compensation calculation unit DPD_data signal and the IQ generated by the amplitude and phase correction unit DPD_UW a second time division switching and combining unit that generates a third SC-FDE block by switching and combining the signals in a time division manner; an analog signal generating unit that performs upsampling, waveform shaping, quadrature modulation, DA conversion, and frequency conversion on the third SC-FDE block generated by the second time division switching and combining unit to generate an analog signal; the power amplifier unit performing power amplification on the analog signal generated by the analog signal generator; A single carrier transmission device comprising:

4. 4. The single carrier transmission apparatus according to claim 3, The amplitude and phase correction unit The IQ separated by the time division switching separation unit channel_UW signal and the IQ generated by the UW signal generator UW The IQ in the second SC-FDE block is calculated based on the signal. channel_UW The amplitude error and phase error of all symbols constituting the signal are detected, and the average values ​​of the errors are calculated. These are then used to calculate the IQ. channel_UW a UW signal amplitude / phase error detection unit for detecting an average value of amplitude distortion and an average value of phase distortion of the signal; The IQ obtained by the UW signal amplitude and phase error detection unit channel_UW The average value of the amplitude distortion and the average value of the phase distortion of the signal are compared with the error between the ideal input / output characteristic of the UW in the power amplifier unit and the actual input / output characteristic of the UW, and the IQ channel_UW An operating point at which the average value of the amplitude distortion and the average value of the phase distortion of the signal coincide with the error is identified, and the IQ channel_UW a comparison unit for determining input characteristic values ​​corresponding to an average value of amplitude distortion and an average value of phase distortion of a signal as an amplitude correction value and a phase correction value; The IQ generated by the UW signal generating unit UW The amplitude correction value obtained by the comparison unit is added to the amplitude of the signal, and the IQ UW The phase correction value obtained by the comparison unit is added to the phase of the signal, and the IQ DPD_UW A UW correction signal generator for determining a UW correction signal; A single carrier transmission device comprising:

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