JP2004356835A - Transmitter and receiver - Google Patents

Abstract

An object of the present invention is to prevent deterioration of a modulation spectrum due to a difference in propagation delay between signals of an amplitude component and a phase component in a transmission system using a polar modulation method.
A delay amount of an amplitude component or a phase component is changed by a signal delay unit so that a distortion amount of an output modulation signal of a power amplifier is minimized, or modulation is performed using a chirp signal instead of a modulation signal. By changing the delay amount so that the signal has a specific frequency component, the timing of the signal of the phase component and the signal of the amplitude component in the power amplifier 150 are matched, the distortion of the modulation spectrum is reduced, and the power efficiency of the power amplifier is increased. Implement a wireless device.
[Selection diagram] Fig. 1

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a transmission device and a reception device that provide a function of reducing distortion in a power amplifier used in a transmission system and increasing power efficiency in a wireless device performing data communication.
[0002]
[Prior art]
2. Description of the Related Art In recent wireless communication systems, a high-efficiency transmission method such as a multi-level modulation method such as QAM or an OFDM (orthogonal frequency division multiplexing method) is used to perform high-speed data transmission by effectively utilizing frequency resources. When wireless transmission is performed by using these transmission methods, it is necessary to suppress nonlinear distortion in a power amplifier in a transmission system of a wireless device and to reduce adjacent channel leakage power. As a countermeasure, there is a method of using a class A or class AB power amplifier having high linearity, but there is a drawback that power efficiency is inferior to that of a nonlinear amplifier. For this reason, a distortion compensation technique has been used as a technique for suppressing distortion and improving power efficiency while using a power amplifier having poor linearity. Numerous methods such as an envelope removal and restoration (EER) method, a polar loop method, a predistortion method, a feed forward method, and a LINC method have been proposed as the distortion compensation technique.
[0003]
Here, FIG. 6 is a block diagram showing a schematic configuration of a transmission system using an envelope removal and restoration (EER) method as an example of a distortion compensation method in a wireless device. The digitized transmission data input from the data input terminal 160 is converted into a digitally modulated signal which has been subjected to modulation and band limitation by the arithmetic means 100 realized by a digital signal processor DSP or the like. Is separated into two polar coordinate signals, a phase component and an amplitude component on a complex plane. The signal of the amplitude component is converted to analog by the DA converter 110, the signal of the phase component is converted to analog by the DA converter 111, and each analog signal is smoothed by the filter means 120 and 121. The amplitude modulation means 140 controls the gain of the power amplifier 150 according to the amplitude component signal output from the filter means 120. The phase modulating means 130 modulates the phase of the sine wave signal of the carrier frequency with the signal of the phase component output from the filter means 121 to generate a phase modulated signal having a constant envelope. The phase modulation signal is subjected to power amplification and gain control in the power amplifier 150, and becomes a modulation signal output from the antenna after being changed in the envelope. (For example, refer to Patent Document 1.)
The phase modulation signal output from the phase modulation means 130 can be generated by converting a signal of a phase component into an in-phase signal (I signal) and a quadrature signal (Q signal) in quadrature coordinates and quadrature-modulating the carrier signal. In this case, the conversion of the phase component into an IQ signal may be performed in advance by the arithmetic means 100. Further, the phase modulation signal can be generated by changing a control voltage of a VCO that oscillates a carrier frequency by a signal of a phase component. As a method of controlling the gain of the power amplifier 150 by the amplitude modulation means 140, there is a method of changing the power supply voltage. In this case, since the gain changes almost linearly with respect to the power supply voltage, the control is easy. However, a circuit for converting the signal of the amplitude component into a signal that can be driven by the power amplifier is required. In the case where gain control or output power control can be performed by changing a bias of a gate (base) of a transistor or the like in a power amplifier, gain control can be performed without providing a driving circuit. However, in this case, since the control voltage and the gain are often not in a linear relationship, the conversion from the signal of the amplitude component to the control signal of the power amplifier is processed in the arithmetic means 100 in advance. Generally, a power amplifier has non-linearity such as amplitude-amplitude conversion (AM-AM conversion) and amplitude-phase conversion (AM-PM conversion). By doing so, it is possible to reduce the influence of nonlinearity. In the conventional method described above, since the envelope of the signal input to the power amplifier is constant, it can be used in a region where the power amplifier is saturated, and the power efficiency can be improved.
[0004]
[Patent Document 1]
JP-A-06-252647 (FIG. 1)
[0005]
[Problems to be solved by the invention]
In the distortion compensation method using a polar coordinate signal typified by the above-described conventional envelope removal and restoration method, since the amplitude component signal and the phase component signal are multiplied in the power amplifier, the phase component and the amplitude component in the power amplifier are multiplied. Is important, and when a timing error occurs, the characteristic degradation such as the expansion of the side lobe of the modulation spectrum occurs. As an example, it is known that when performing modulation by eight-phase PSK in the GSM system popularized as a cellular system, it is necessary to match the timing of amplitude and phase signals with an error smaller than 100 nanoseconds. In response to such a demand, in an actual apparatus, even when the timing of the signal of the amplitude component and the timing of the signal of the phase component are transmitted at the same time by the arithmetic means, the difference in the wiring length between the two signal paths and the delay characteristic of the two filter means are not considered. A timing error occurs due to the influence of variations and the like, and the quality of a transmission wave such as a modulation spectrum and modulation accuracy deteriorates. The requirement for such timing accuracy becomes more severe as the transmission speed increases.
[0006]
The present invention solves the above-mentioned conventional problems.In a transmission system that operates in a distortion compensation method using a polar coordinate signal such as an envelope removal restoration method or a polar loop method, the timing accuracy of a phase component and an amplitude component is increased, and a power amplifier is used. It is an object of the present invention to provide a wireless device that reduces distortion and improves power efficiency.
[0007]
[Means for Solving the Problems]
In order to achieve the above object in a transmission system operating in a distortion compensation system in which the envelope component of the modulation signal is removed in advance and the envelope is restored by gain control of the power amplifier, the envelope component of the modulation signal is removed in advance. In a transmission device capable of restoring an envelope by gain control of a power amplifier, a distortion detection unit for detecting distortion of a transmission signal output by the power amplifier, and a signal of the envelope component to the power amplifier. A transmission device provided on a transmission path, comprising a signal delay unit that controls a delay amount so that a distortion amount detected by the distortion detection unit is minimized, wherein an envelope component, that is, an amplitude component is It is possible to optimally adjust the timing of multiplying the power amplifier with the phase component.
[0008]
Further, there are provided phase modulation means for generating a carrier signal having a constant envelope which is phase-modulated by the phase component of the baseband modulation signal, and amplitude modulation means for controlling the gain of the power amplifier by the amplitude component of the baseband modulation signal. A signal delay unit that controls a delay amount so as to delay a signal of the phase component or the amplitude component input to the phase modulation unit or the amplitude modulation unit; This shows a specific insertion point of the signal delay means with respect to the signal, and the delay control is performed on the analog baseband signal of the amplitude component or the phase component, so that the timing is compared with the case where the signal of the carrier frequency band is controlled. The control can be performed easily and with high accuracy.
[0009]
A first signal delay unit for delaying a phase component signal input to the phase modulation unit; and a second signal delay unit for delaying an amplitude component signal input to the amplitude modulation unit, the first signal delay unit comprising: And a second signal delay means for fixing one of the delay amounts and controlling the other delay amount, and in the mounted transmission circuit, the timing of either the amplitude component or the phase component , The characteristics of the transmission modulation wave can be optimized by the timing control.
[0010]
In addition, there are first filter means connected before the phase modulation means to limit the band of the signal of the phase component, and second filter means connected before the amplitude modulation means to limit the band of the signal of the amplitude component. The signal delay means controls a delay amount by changing a pass characteristic of the first or second filter means, and constitutes a filter means having a low-pass characteristic. By changing the circuit element value, the amount of delay of the passing signal can be changed, so that the signal delay means of the present invention can be realized without adding a special circuit for signal delay.
[0011]
Further, the transmitting apparatus further comprises a calculating means for controlling a delay amount by changing a timing of the output signal when separating and outputting the baseband modulated signal into a signal of a phase component and an amplitude component. In the arithmetic means for modulating and band limiting the digitized transmission data, in addition to the arithmetic processing for separating the generated baseband modulation signal into a phase component and an amplitude component, the delay of the signal of the phase component and the amplitude component is performed. Is performed by arithmetic processing, it is possible to realize the signal delay unit of the present invention without adding a special circuit for signal delay.
[0012]
Further, in a receiving apparatus for receiving and demodulating a radio signal, the receiving apparatus further includes a distortion detecting unit configured to detect distortion of a signal obtained by demodulating a part or all of a transmission signal output by the power amplifier. Thus, the distortion detecting means of the present invention can be realized without adding a special circuit for detecting distortion.
[0013]
A carrier signal source that outputs a carrier signal that is a sine wave; a chirp signal source that outputs a chirp signal whose frequency changes with time to both signal paths of an amplitude component and a phase component; Phase modulation means for mixing signals, frequency conversion means for converting the output signal of a power amplifier and the carrier signal into a difference signal, and a path for transmitting a signal of an envelope component of a modulation signal to the power amplifier. Signal delay means for delaying a signal transmission time; and frequency component detection means for detecting a frequency component of the differential signal and controlling a delay amount by the signal delay means so that the detected frequency component becomes a DC component. A transmission device characterized by performing a method of detecting a frequency component using a chirp signal instead of detecting a distortion amount due to a modulation signal. It is possible to control the timing error.
[0014]
The chirp signal source outputs the first chirp signal to a signal path of an amplitude component, and outputs a second chirp signal having a certain frequency difference at the same time as the first chirp signal to a signal path of a phase component. And the frequency component detection means is a transmission device characterized by controlling the amount of delay by the signal delay means so that the detected frequency component becomes the frequency difference. The timing error can be controlled by detecting the frequency component.
[0015]
Further, in a receiving device that receives and demodulates a radio signal, a frequency conversion unit that outputs a difference from a carrier frequency to a signal obtained by demodulating a part or all of a transmission signal output by the power amplifier, and outputs the difference. A receiving device comprising frequency component detecting means for detecting a frequency component of a signal, wherein the frequency converting means and the frequency component detecting means of the present invention are provided without adding a special circuit of the frequency converting means and the frequency component detecting means. The means can be realized.
[0016]
Also, instead of the frequency component detection means, a comparison signal having the same frequency as the frequency difference between the first chirp signal and the second chirp signal is compared with a phase difference between the signals converted by the frequency conversion means. A phase comparing means for controlling the amount of delay by the signal delay means by synchronizing the phase so that the phase difference is constant, and controlling a timing error by a phase locked loop. Becomes possible.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 5.
[0018]
(Embodiment 1)
A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a block diagram showing a wireless device according to the first embodiment of the present invention. FIG. 1 shows a transmission system of a wireless device. The basic operation is the same as the operation of the transmission system based on the envelope removal and restoration (EER) method described in the related art. FIG. 1 differs from FIG. 6 which explains the conventional technique in that a signal delay means 10 provided between a filter means 120 and an amplitude modulation means 140, a coupler 30 for extracting a part of the output of a power amplifier 150, The point is that a distortion detecting means 20 for detecting a distortion amount of a signal obtained from the coupler 30 is provided.
[0019]
The operation will be described below. The polar modulation method such as the envelope removal and restoration method and the polar loop method is a method in which the amplitude component (envelope component) of a modulation signal is multiplied by the phase component in a power amplifier or an amplifier at a preceding stage. The characteristic of the modulated signal is degraded due to the timing error between the component (i. FIG. 2 shows an example of a change in modulation spectrum due to a timing error between an amplitude component (envelope component) and a phase component in the envelope removal and restoration method. It can be seen that the modulation spectrum when there is no timing error is contained in the spectrum mask, but when the timing error is large, the distortion components on both sides are lifted and run off the spectrum mask. Thus, the signal timing error between the amplitude component and the phase component appears as distortion in the modulation spectrum. Further, comparing the case where the delay time is the same and the phase signal is delayed and the case where the amplitude signal is delayed, the influences on distortion in both cases are almost the same.
[0020]
In the present embodiment, a coupler 30 including a directional coupler or the like is provided on the output side of the power amplifier 150 to extract a part of a transmission signal, and the distortion detector 20 detects a distortion amount. The distortion detection means 20 performs digital signal processing on the demodulated transmission signal to calculate the level of the distortion frequency component, or performs frequency conversion to an analog baseband signal and then filters the distortion component to perform level detection. The amount can be calculated.
[0021]
The signal delay means 10 is inserted before the amplitude modulation means 140, and changes the amount of delay of the amplitude component signal under the control of the distortion detection means 20. The amount of delay is set so that the amount of distortion obtained by the distortion detecting means 20 is minimized. In order to determine the amount of delay of the signal delay means 10 in the distortion detecting means 20, first, the amount of delay is changed in an appropriate range to accumulate the relationship between the amount of delay and the amount of distortion, and the amount of delay that gives the minimum distortion is selected from the accumulated data. There is a method of doing. Further, a method of sequentially changing the delay amount while measuring the distortion and searching for a point at which the distortion amount shows the minimum value can be used.
[0022]
As described above, since a certain amount of arithmetic processing is required to control the amount of delay in the distortion detecting means 20, a part or all of the functions of the distortion detecting means 20 may be realized by the arithmetic means 100. In addition, since the demodulation process is involved, when the wireless device includes a receiving unit that receives and demodulates a wireless signal, a configuration may be adopted in which part or all of the function of the distortion detecting unit 20 is realized by the receiving unit. .
[0023]
In the present embodiment, an example is shown in which the signal delay means 10 is provided on the path through which the signal of the amplitude component is transmitted. However, in the case where the signal delay means 10 is not provided, the signal of the amplitude component is output earlier than the phase component signal. It is effective under the condition that it reaches the amplifier 150. When the above condition is not satisfied, that is, when the signal of the phase component reaches the power amplifier 150 first, the signal delay unit 10 may be provided before the phase modulation unit 130. When it is not clear which signal of the phase or the amplitude is delayed, signal delay means are provided in both the phase signal path and the amplitude signal path as shown in FIG. May be fixed and the other delay amount may be changed, or the delay amounts of both signal delay means may be changed. FIG. 3 shows a configuration in which the delay amount of the signal delay unit 11 is fixed and only the signal delay unit 10 is controlled. Here, a value obtained by adding or subtracting the delay difference between both the phase and the amplitude paths assumed when there is no signal delay means to the median value of the delay amount adjustment width of the signal delay means 10 is defined as the delay amount of the signal delay means 11. It is possible to adjust the timing so that the amount of distortion is minimized regardless of whether the phase or the amplitude of the signal is delayed.
[0024]
Further, in the present embodiment, an example is shown in which the signal delay means 10 is provided after the filter means 120, but the filter means may have the function of the signal delay means. The filter means 120 to 121 function as a low-pass filter for smoothing the output of the DA converters 110 to 111. By changing the element value of a circuit constituting the low-pass filter, the signal of the signal within the pass band is changed. It is possible to change the amount of delay. If a large change is applied to the element value in order to obtain a large change in the delay amount, the pass characteristic of the filter greatly changes and the modulation characteristic is deteriorated, so that the transmission delay difference between the phase signal path and the amplitude signal path is small. This is an effective method when the minimum distortion can be obtained even with a minute timing adjustment.
[0025]
Further, in the present embodiment, it is also possible for the arithmetic means 100 for generating a modulated signal to have a function of a signal delay means. When the arithmetic means 100 separates the baseband modulated signal into a signal of a phase component and an amplitude component and outputs the signal, the delay amount is equivalently controlled by changing the output timing of each signal by arithmetic processing. .
[0026]
The above-described procedure for optimally setting the delay amount cannot be performed in real time at the time of data transmission because of temporary distortion degradation. However, since the deterioration factor of the timing error of the phase amplitude signal does not always fluctuate greatly, it is sufficient to perform the initial adjustment at the time of manufacturing the wireless device, or at the initial stage at the time of turning on the power of the wireless device or at the time of transmission, After the optimization adjustment, the delay amount of the signal delay unit 10 may be held and the control of the distortion detection unit 20 may be separated.
[0027]
As described above, according to the present embodiment, by changing the signal delay amount of the amplitude component or the phase component of the modulated signal so that the distortion amount of the transmission output is minimized, the phase component and the amplitude component in the power amplifier are changed. Are matched, the distortion in the power amplifier is reduced and the power efficiency is improved, thereby realizing a wireless device.
[0028]
(Embodiment 2)
A second embodiment of the present invention will be described with reference to FIG. FIG. 4 is a block diagram showing a wireless transmission system according to the second embodiment of the present invention. 4 differs from FIG. 1 in that a frequency conversion unit 40 and a frequency component detection unit 60 are provided instead of the distortion detection unit, and a carrier signal source 50 and a chirp signal source 70 that emits a signal whose frequency changes with time are provided. This is the point shown.
[0029]
The operation will be described below. The basic operation is the same as that of the wireless device described in the first embodiment. In the present embodiment, at the time of timing adjustment, the chirp signal whose frequency changes with time is output from the arithmetic means 100 to the signal path of the amplitude and phase components simultaneously instead of the modulation signal. In the phase modulating means 130, the first chirp signal transmitted from the filter means 121 and the carrier signal having a constant frequency transmitted from the carrier signal source 50 are mixed, and the mixed signal becomes an input signal of the power amplifier 50. The amplitude modulation means 140 controls the power amplifier 150 based on the second chirp signal transmitted via the DA converter 110, the filter means 120, and the signal delay means 10. Therefore, in the coupler 30, an output signal in which the input signal of the amplifier and the second chirp signal propagated from the path of the amplitude component are mixed appears. Here, if the output signal is converted into a difference signal from a carrier frequency by the frequency conversion means 40, a signal having a frequency component of a difference between the first and second chirp signals can be obtained. The first and second chirp signals are mixed in the power amplifier 150. If there is no delay difference between the path of the amplitude component and the phase component, signals of the same frequency are mixed. Is only a DC component. Therefore, the frequency component of the difference signal is detected by the frequency component detection means 60, and the timing control can be performed by changing the delay amount of the signal delay means 10 so that only the DC component is obtained. Although the frequency component of the sum of the first and second chirp signals also appears in the output of the frequency conversion means 40, this component does not need to be considered and may be ignored or suppressed with a low-pass filter or the like. .
[0030]
In addition, since the demodulation process accompanies, when the wireless device includes a receiving unit that receives and demodulates a radio signal, the frequency conversion unit demodulates part or all of the transmission signal output by the power amplifier. The difference between the signal and the carrier frequency may be output, and the frequency component detection means may detect the frequency component of the signal having output the difference.
[0031]
As described above, according to the present embodiment, a chirp signal is used instead of a modulation signal, and the frequency component of a signal obtained by down-converting the output of a power amplifier with a carrier frequency signal is detected, and the frequency component is a DC component. By changing the signal delay amount of the amplitude component or the phase component of the modulated signal so that only the phase component and the amplitude component are multiplied, the timing at which the phase component and the amplitude component are multiplied in the power amplifier is matched, thereby reducing distortion in the power amplifier and improving power efficiency. An enhanced wireless device can be realized.
[0032]
(Embodiment 3)
A third embodiment of the present invention will be described with reference to FIG. FIG. 5 is a block diagram showing a wireless transmission system according to the third embodiment of the present invention. 5 differs from FIG. 4 in that a phase comparison means 80 and a control signal filter means 90 are provided instead of the frequency component detection means, and that a fixed frequency signal source 72 and a chirp signal conversion means in addition to the chirp signal source 70 are provided. 71.
[0033]
The operation will be described below. The basic operation is the same as that of the wireless device described in the second embodiment. In the present embodiment, the first chirp signal generated by the chirp signal source 70, the signal of the fixed frequency signal source 72 having no temporal frequency change in the chirp signal conversion means 71, and the first chirp signal are mixed. The second chirp signal obtained by the above is used. The first chirp signal propagates through a signal path of an amplitude component, and the second chirp signal propagates through a signal path of a phase component. Here, when there is no delay difference between the two signal paths and the two signals are mixed at the same timing in the power amplifier 150, a signal having the same frequency as that of the fixed frequency signal source 72, that is, the signal is input from the frequency conversion means 40. A signal having the same frequency as the frequency difference between the first and second chirp signals can be obtained. Therefore, the phase comparing means 80 compares the phase of the output signal of the frequency conversion means 40 with the phase of the output signal of the fixed frequency signal source 72, and adjusts the delay amount of the signal delay means 10 so that the phase difference becomes constant, ie, the frequency becomes the same. The adjustment can optimize the timing. Here, a circuit element whose element value changes according to a voltage of a varactor diode or the like is configured so that the amount of propagation delay of the signal delay unit 10 can be voltage-controlled. By providing a control signal filter means 90 for controlling the phase synchronization operation as a loop filter, the timing can be adjusted by the phase synchronization control.
[0034]
In the present embodiment, the frequency difference between the first and second chirp signals output from the frequency conversion means 40 may coincide with the frequency of the fixed frequency signal source 72 due to the delay difference between the signal paths of the amplitude and phase components. Although possible, it can be avoided by appropriately setting the frequency change of the chirp signal according to the assumed delay difference of the signal path. When the phase synchronization control is locked, the control loop may be disconnected after the state of the signal delay unit 10 is maintained.
[0035]
As described above, according to the present embodiment, two chirp signals having a constant frequency difference are used in place of the modulation signal, and the frequency difference is equal to the signal obtained by down-converting the output of the power amplifier by the carrier frequency signal. By controlling the signal delay amount of the amplitude component or the phase component of the modulated signal in phase synchronization so that the timing at which the phase component and the amplitude component are multiplied in the power amplifier is matched, distortion in the power amplifier is reduced and power is reduced. A wireless device with improved efficiency can be realized.
[0036]
In all of the embodiments, the configuration in which the signal delay means is provided to adjust the delay amount has been described. However, the arithmetic means 100 is controlled to adjust the delay amount by shifting the signal output timing of the phase component and the amplitude component. It is also possible.
[0037]
【The invention's effect】
As described above, the wireless device of the present invention changes the signal delay amount of the amplitude component or the phase component of the modulated signal so that the distortion amount of the transmission output signal is minimized, or when the chirp signal is input. By changing the signal delay amount of the amplitude component or phase component of the modulation signal so that the transmission output signal has a specific frequency component, the timing of the phase component and the amplitude component in the power amplifier is matched to reduce distortion in the power amplifier. This has the effect that a wireless device with improved power efficiency can be realized.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating a wireless device according to a first embodiment of the present invention; FIG. 2 is a diagram illustrating an operation of the wireless device according to the first embodiment of the present invention; FIG. FIG. 4 is a block diagram illustrating a wireless device according to an embodiment of the present invention. FIG. 4 is a block diagram illustrating a wireless device according to a second embodiment of the present invention. FIG. 5 is a diagram illustrating a wireless device according to a third embodiment of the present invention. FIG. 6 is a block diagram showing a wireless device according to the related art.
10, 11 signal delay means 20 distortion detection means 30 coupler 40 frequency conversion means 50 carrier signal source 60 frequency component detection means 70 chirp signal source 71 chirp signal conversion means 72 fixed frequency signal source 80 phase comparison means 90 control signal filter means 100 Operation means 110, 111 DA converters 120, 121 Filter means 130 Phase modulation means 140 Amplitude modulation means 150 Power amplifier 160 Data input terminal

Claims (11)

In a transmitter capable of removing the envelope component of the modulation signal in advance and restoring the envelope by controlling the gain of the power amplifier,
Distortion detecting means for detecting distortion of a transmission signal output from the power amplifier, and a path for transmitting the signal of the envelope component to the power amplifier are provided so that the amount of distortion detected by the distortion detecting means is minimized. A signal delay means for controlling a delay amount. A phase modulation unit that generates a carrier signal having a constant envelope modulated by a phase component of the baseband modulation signal, and an amplitude modulation unit that controls a gain of a power amplifier by an amplitude component of the baseband modulation signal. 2. The transmitting apparatus according to claim 1, wherein the signal delay unit controls a delay amount such that a signal of the phase component or the amplitude component input to the phase modulation unit or the amplitude modulation unit is delayed. A first signal delay unit for delaying a signal of a phase component input to the phase modulation unit; and a second signal delay unit for delaying a signal of an amplitude component input to the amplitude modulation unit, wherein the first and second signal delay units are provided. 3. The transmission apparatus according to claim 2, wherein the signal delay means controls the delay amount of one of the fixed delay amounts. A first filter unit connected to a stage preceding the phase modulation unit for band-limiting the signal of the phase component; and a second filter unit connected to a stage preceding the amplitude modulation unit for band-limiting the signal of the amplitude component. 3. The transmitting apparatus according to claim 2, wherein the signal delay unit controls a delay amount by changing a pass characteristic of the first or second filter unit. 3. A method according to claim 2, further comprising the step of: changing a timing of the output signal to control a delay amount when separating and outputting the baseband modulation signal into a phase component and an amplitude component signal. 3. The transmitting device according to any one of 3. A receiving apparatus for receiving and demodulating a radio signal, comprising: a distortion detecting means for detecting distortion of a signal obtained by demodulating a part or all of a transmission signal output by the power amplifier. A carrier signal source that outputs a carrier signal that is a sine wave, a chirp signal source that outputs a chirp signal whose frequency changes with time to both signal paths of an amplitude component and a phase component, and the carrier signal and the chirp signal. Phase modulation means for mixing; frequency conversion means for converting the output signal of the power amplifier and the carrier signal into a difference signal; and a signal transmission path provided on a path for transmitting an envelope component signal of the modulation signal to the power amplifier. Signal delay means for delaying time, and frequency component detection means for detecting a frequency component of the difference signal and controlling a delay amount by the signal delay means so that the detected frequency component becomes a DC component. A transmission device characterized by the above-mentioned. The chirp signal source outputs a first chirp signal to a signal path of an amplitude component, and outputs a second chirp signal having a fixed frequency difference at the same time as the first chirp signal to a signal path of a phase component. And
8. The transmitting apparatus according to claim 7, wherein the frequency component detection unit controls a delay amount by a signal delay unit so that a detected frequency component becomes the frequency difference. In a receiving apparatus that receives and demodulates a radio signal, a frequency conversion unit that outputs a difference from a carrier frequency to a signal obtained by demodulating a part or all of a transmission signal output by the power amplifier, and a signal conversion unit that outputs the difference. A receiving device comprising frequency component detecting means for detecting a frequency component. Instead of the frequency component detection means, a comparison signal having the same frequency as the frequency difference between the first chirp signal and the second chirp signal is compared with a phase difference between the signals converted by the frequency conversion means, 9. The transmitting apparatus according to claim 8, further comprising a phase comparing unit that controls a delay amount of the signal delay unit by performing phase synchronization so that a phase difference is constant. The transmitting apparatus according to claim 10, wherein the second chirp signal is a signal obtained by mixing a fixed frequency signal having no temporal frequency change and the first chirp signal.

Images