Transmitting signal generator

Abstract

To provide a transmission signal generation device capable of suppressing a leakage local signal contained in a transmission signal generated through heterodyning from an input signal.SOLUTION: A transmission signal generation device 1 includes: a local signal generator 103 for generating a local signal; a frequency converter 101 for generating a transmission signal by mixing an input signal and the local signal; a cancellation signal generator 113 for generating a cancellation signal from the local signal where the cancellation signal is for cancelling a leakage local signal derived from the local signal and contained in the transmission signal; and a synthesizer 115 for synthesizing the transmission signal and the cancellation signal.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] This disclosure relates to a technique for suppressing local signals leaked into a transmitted signal generated from an input signal by heterodyne. [Background technology]

[0002] Sixth-generation mobile communication systems (so-called 6G) ​​require bit rates exceeding 100 Gbps for high-capacity, high-speed wireless communication. One technology to meet this requirement is widening the signal bandwidth. According to the Shannon-Hartley theorem, if the signal bandwidth is multiplied by L, the channel capacity is multiplied by L. To transmit a wideband signal, it is necessary to use a high-frequency band that can secure a corresponding frequency bandwidth. Generally, high-frequency band transmission signals are generated by multi-stage upconversion of the baseband signal. However, from the perspective of reducing equipment costs, large-scale upconversion from the low-frequency band of the baseband signal or intermediate-frequency band signal to the high-frequency band of the transmission signal (i.e., upconversion with a sufficiently large difference between the center frequency of the low-frequency band and the center frequency of the high-frequency band) is effective. Furthermore, since the generation of wideband baseband signals generally involves increased power consumption and degradation of signal quality, wideband signals are sometimes generated using multi-carrier transmission technology. According to multi-carrier transmission technology, a multi-carrier broadband signal is generated by frequency multiplexing multiple narrowband baseband signals using different carrier frequencies. [Overview of the Initiative] [Problems that the invention aims to solve]

[0003] Frequency conversion is based on heterodyne, and is achieved by mixing the input signal and the local signal generated by the local signal generator with the frequency converter. The signal from a real frequency converter includes not only a signal with a frequency based on heterodyne, but also a signal originating from the input signal (hereinafter referred to as the "leaked input signal") and a signal originating from the local signal (hereinafter referred to as the "leaked local signal"). In the case of large-scale upconversion, the frequency bandwidth of the input signal is sufficiently far from the high-frequency bandwidth, so the leaked input signal can be sufficiently suppressed by a filter (e.g., a bandpass filter). However, because the difference between the frequency of the local signal and the center frequency of the high-frequency bandwidth is small, the leaked local signal cannot be sufficiently suppressed by a filter (e.g., a bandpass filter). If the suppression of the leaked local signal is insufficient in multicarrier transmission, the leaked local signal interferes with the high-frequency bandwidth signal obtained using another local signal with a frequency close to the frequency of the local signal, thus degrading the transmission quality of the multicarrier broadband signal.

[0004] The above-mentioned concerns will be explained below with reference to Figures 1 and 2. Figure 1 shows an example configuration of a prior art wireless transmitter 900, and Figure 2 shows the relationship between the high-frequency band spectrum of the transmitted signal and the frequency characteristics of the filter. The wireless transmitter 900 includes a modulator 10 that generates an input signal for a certain channel in multi-carrier transmission (e.g., a narrowband baseband signal), a transmit signal generator 90, and a transmit antenna 20. The transmit signal generator 90 includes a local signal generator 103 that generates a local signal, a frequency converter 101 that generates a transmit signal by mixing the input signal and the local signal, a filter 105 for suppressing unwanted signals generated by mixing the input signal and the local signal, and an amplifier 107 that amplifies the transmit signal.

[0005] The center frequency of the input signal is f BB Let BW be the bandwidth of the input signal, then f BB is f BB >It is set to satisfy BW / 2. The local signal generator 103 has a frequency f LOgenerates a local signal. The center frequency f of the transmission signal generated by the frequency converter 101 (in this example, it is a signal in the upper sideband) RF is f LO + f BB . Therefore, the lower frequency limit of the transmission signal is f LO + f BB - BW / 2 (see Fig. 2).

[0006] By the way, as described above, the leakage local signal is included in the transmission signal from the frequency converter 101. The difference between the center frequency f of the transmission signal RF and the frequency f of the local signal LO is equal to the center frequency f of the input signal BB (see Fig. 2). When the center frequency f of the input signal BB is high, the frequency f of the leakage local signal LO is far from the center frequency f of the transmission signal RF , so the leakage local signal can be sufficiently suppressed by a filter (for example, a band-pass filter). However, the lower the center frequency f of the input signal BB , the closer the frequency f of the local signal LO is to the center frequency f of the transmission signal RF . That is, since the frequency f of the leakage local signal LO is located near the frequency band of the transmission signal, the leakage local signal cannot be sufficiently suppressed by a filter (for example, a band-pass filter) (see Fig. 2). The leakage local signal that cannot be suppressed by the filter interferes with the transmission signal of the adjacent channel (the transmission signal of the adjacent channel is a high-frequency band signal having a center frequency f LO close to the frequency f of the local signal RF_adjacent and is obtained using another local signal having a frequency close to the frequency f of the local signal LO ) (see Fig. 2).

[0007] In this regard, when a balanced mixer is used as the frequency converter 101, the local signal is differentially input to the balanced mixer, so leakage of the local signal to the transmitted signal is suppressed by about 20 dB to 30 dB. However, if the power of the local signal is high, the power of the leaked local signal will also be high. Alternatively, when a subharmonic mixer is used as the frequency converter 101, the local signal is generated from a fundamental signal with half the frequency of the local signal, so the frequency of the leaked local signal is the center frequency f of the transmitted signal. RF The frequency is sufficiently low, and therefore the leaked local signal can be adequately suppressed by the filter. However, due to imperfections in the subharmonic mixer, harmonics of the fundamental signal (e.g., the second harmonic) may leak into the transmitted signal. Typically, the power of the leaked local signal is minute, but when transmitting a multi-carrier broadband signal via multi-carrier transmission, the power density of the multi-carrier broadband signal is very small, so even a leaked local signal with minute power can affect the signal quality of the multi-carrier broadband signal. Therefore, it is necessary to adequately suppress the leaked local signal. For example, if the bandwidth of the multi-carrier broadband signal is 10 GHz, the power density of the multi-carrier broadband signal is 1 / 10 of the signal power. 10 Therefore, when the signal power is 0 dBm, the power density is -100 dBm / Hz, and thus, leakage local signals need to be sufficiently suppressed.

[0008] In view of the above-mentioned background technology and technical considerations, a transmission signal generation device is disclosed that suppresses leaky local signals contained in a transmission signal generated from an input signal by heterodyne. [Means for solving the problem]

[0009] The technical matters described here are not for explicitly or implicitly limiting the invention described in the claims of the patent, nor for enabling a person other than those who benefit from the present invention (for example, the applicant and the patentee) to limit the invention described in the claims of the patent. It is merely provided for facilitating the understanding of the gist of the present invention. The overview of the present invention from other viewpoints can be understood, for example, from the claims of this patent application at the time of filing. Briefly stated, the transmission signal generation device of the present disclosure generates a cancellation signal for canceling the leaked local signal from the local signal, and synthesizes the transmission signal and the cancellation signal.

Effect of the Invention

[0010] The transmission signal generation device of the present disclosure suppresses the leaked local signal included in the transmission signal by synthesizing the cancellation signal for canceling the leaked local signal and the transmission signal.

Brief Description of the Drawings

[0011] [Figure 1] Configuration example of a prior art transmission signal generation device. [Figure 2] Relationship between the high-frequency band spectrum of the transmission signal and the frequency characteristics of the filter. [Figure 3] Configuration example of the transmission signal generation device of the first embodiment. [Figure 4] Configuration example of the transmission signal generation device of the second embodiment. [Figure 5] Configuration example of the transmission signal generation device of the third embodiment. [Figure 6] Configuration example (1) of the amplitude-phase determiner. [Figure 7] Configuration example (2) of the amplitude-phase determiner.

Modes for Carrying Out the Invention

[0012] Embodiments of the transmitting signal generation apparatus of this disclosure will be described with reference to the drawings. From the viewpoint of clarifying the essential points of the embodiments, the illustration and description of components that are actually necessary or may be necessary but are considered non-essential in the embodiments (such as intermediate amplifiers) will be omitted.

[0013] <First Embodiment> Figure 3 shows an example configuration of a wireless transmitter 800 using the transmit signal generator 1 of the first embodiment. The wireless transmitter 800 includes a modulator 10 that generates an input signal (for example, a narrowband baseband signal for a certain channel in multicarrier transmission), the transmit signal generator 1 of the first embodiment, and a transmit antenna 20. The transmit signal generator 1 includes a local signal generator 103, a splitter 111, a frequency converter 101, a filter 105, a cancellation signal generator 113, a combiner 115, and an amplifier 107. The transmit signal generator 1 may include a distributor instead of the splitter 111.

[0014] The local signal generator 103 has a predetermined frequency f LO A local signal with a frequency of f is generated. The branch 111 splits the local signal generated by the local signal generator 103 into two. The frequency converter 101 generates a transmit signal by mixing one of the local signals from the branch 111 with the input signal generated by the modulator 10. This transmit signal includes a leaked local signal derived from the local signal generated by the local signal generator 103, as described above. In this example, the leaked local signal has a frequency f of the local signal. LO Same frequency f LO It has.

[0015] Filter 105 is, for example, a bandpass filter, which suppresses unwanted signals (e.g., lower sideband signals) generated by the mixing of the input signal and the local signal. A band elimination filter may also be used as filter 105. Although the stopband of a band elimination filter is narrow, it can suppress signals more effectively than a bandpass filter. Since the leaked local signal is an unmodulated wave (CW wave), even a band elimination filter with a narrow stopband can suppress the leaked local signal to some extent before the synthesis process by the combiner 115 described later.

[0016] However, in this example, the center frequency f of the transmitted signal RF and the frequency f of the local signal LO Because the difference is small, the leaked local signal is not sufficiently suppressed by filter 105 (see Figure 2). In other words, the center frequency f of the transmitted signal RF and the frequency f of the local signal LO The difference is such that the filter 105 cannot sufficiently suppress the leaked local signal (for example, to the extent that it satisfies the acceptable level of the leaked local signal described later). However, since it is obvious that the leaked local signal cannot be suppressed if the filter 105 is not present, the filter 105 is not an essential component of the transmitting signal generator 1.

[0017] The cancellation signal generator 113 generates a cancellation signal that cancels the leaking local signal from the other local signal from the turnout 111. The cancellation signal generator 113 generates the cancellation signal by adjusting the amplitude and / or phase of the other local signal from the turnout 111. The cancellation signal generator 113 includes an amplitude-phase adjuster 113a that generates the cancellation signal by setting the determined amplitude and / or phase to the local signal. The amplitude-phase adjuster 113a includes, for example, a variable attenuator that adjusts the amplitude and a variable phase shifter that adjusts the phase.

[0018] The amplitude of the cancellation signal is the same as the amplitude of the leaked local signal included in the transmitted signal entering the combiner 115 (i.e., the transmitted signal that has passed through the filter 105), and the phase of the cancellation signal is inverse to the phase of the leaked local signal included in the transmitted signal entering the combiner 115 (i.e., the transmitted signal that has passed through the filter 105) (i.e., the difference between the phase of the cancellation signal and the phase of the leaked local signal is 180 degrees). However, typically, the permissible level of the leaked local signal (e.g., the upper limit of the power of the leaked local signal, the upper limit of the ratio of the power of the leaked local signal to the power of the transmitted signal, etc.) is determined according to the wireless communication method. Therefore, it is sufficient to determine the amount of adjustment for the amplitude of the other local signal from the branch 111 and / or the amount of adjustment for its phase so as to satisfy the permissible level of the leaked local signal, and it is not necessarily required that the amplitude of the cancellation signal be exactly the same as the amplitude of the leaked local signal included in the transmitted signal, nor is it necessary that the phase of the cancellation signal be exactly the same as the phase of the leaked local signal included in the transmitted signal.

[0019] The combiner 115 combines the transmitted signal that has passed through the filter 105 with the cancellation signal generated by the cancellation signal generator 113. As a result, the leaked local signal contained in the transmitted signal that has passed through the filter 105 is sufficiently suppressed by the cancellation signal, in other words, to the extent that it satisfies the acceptable level of the leaked local signal. The transmitted signal is attenuated as the leaked local signal and the cancellation signal are combined. However, the leaked local signal is suppressed to some extent by the filter 105, and since the cancellation signal is a single-frequency signal, its amplification is easier than that of the transmitted signal. Therefore, it is preferable to use a loosely coupled directional coupler or the like as the combiner 115, which has low transmission loss for the transmitted signal. Since the combining process by the combiner 115 is performed before the amplification process of the amplifier 107, the attenuation of the transmitted signal is hardly a problem.

[0020] Amplifier 107 amplifies the transmitted signal from which leaked local signals have been suppressed. The transmitted signal amplified by amplifier 107 is radiated into space by the transmitting antenna 20.

[0021] <Second Embodiment> Figure 4 shows an example configuration of a wireless transmitter 800 using the transmission signal generation device 1 of the second embodiment. The second embodiment is the same as the first embodiment, except that the transmission signal generation device 1 further includes a first multiplier 117a that multiplies the local signal by N and a second multiplier 117b that multiplies the cancellation signal by N. Therefore, the differences between the first and second embodiments will be explained here, and other technical matters should be referred to the description of the first embodiment. By such reference, the description of the first embodiment, excluding the differences, is explicitly incorporated here.

[0022] In the second embodiment of the transmitting signal generation device 1, the local signal generator 103 has a frequency f LO The frequency f of 1 / N LO A local signal with frequency f is generated, where N is a natural number. The first frequency multiplier 117a generates a local signal with frequency f LO By multiplying a local signal with / N by N, the frequency f LO It generates a local signal with a frequency f of 1 / N of the frequency of the leaked local signal included in the transmitted signal that enters the combiner 115. The cancellation signal generator 113 generates a local signal with a frequency f of 1 / N of the frequency of the leaked local signal included in the transmitted signal that enters the combiner 115. LO The cancellation signal with / N is sent to the other local signal from the turnout 111 (the frequency of this local signal is f LO It is generated from (where / N). The second frequency multiplier 117b is frequency f LO By multiplying a cancellation signal with / N by N, the frequency f LO A cancellation signal with the following characteristics is generated. Note that the phase of the cancellation signal is multiplied by N by the N multiplication process of the second multiplier 117b, so the amplitude phase adjuster 113a takes this fact into consideration in advance and sets the required phase shift amount to 1 / N.

[0023] According to the second embodiment, frequency f LOSince the amplitude and / or phase of the local signal with / N is adjusted, an amplitude-phase adjuster 113a that can operate in a low-frequency band can be used. For example, when generating a 160 GHz local signal by quadrupling a 40 GHz unmodulated wave (CW wave), according to the first embodiment, an amplitude-phase adjuster 113a that can operate at 160 GHz is required, but according to the second embodiment, an amplitude-phase adjuster 113a that can operate at 40 GHz can be used. Generally, devices that can operate in a low-frequency band offer high performance at low cost, so in this respect there is an advantage to performing amplitude and / or phase adjustment in a lower frequency band.

[0024] <Third Embodiment> Figures 5, 6, and 7 show an example configuration of a wireless transmitter 800 using the transmitting signal generator 1 of the third embodiment. The third embodiment is the same as the second embodiment, except that the transmitting signal generator 1 further includes at least a branching switch 119, and the cancellation signal generator 113 includes not only an amplitude phase adjuster 113a but also an amplitude phase determiner 113b. Therefore, the differences between the second and third embodiments will be explained here, and other technical matters should be referred to the description of the second embodiment. By such reference, the description of the second embodiment, excluding the differences, is explicitly incorporated here.

[0025] In the third embodiment of the transmit signal generation device 1 shown in Figure 5, the brancher 119 splits the transmit signal (i.e., the transmit signal output by the combiner 115) from which the leaked local signal has been suppressed into two. The transmit signal generation device 1 may include a distributor instead of the brancher 119. The amplifier 107 amplifies one of the transmit signals from the brancher 119. The amplitude-phase determiner 113b determines the amplitude and / or phase to set for the local signal in order to generate a cancellation signal from the leaked local signal (i.e., the leaked local signal that remains unsuppressed by the combining process of the combiner 115) contained in the other transmit signal from the brancher 119. The amplitude-phase determiner 113b determines the amplitude and / or phase to set for the local signal in order to generate a cancellation signal using a criterion (e.g., perturbation method) that minimizes the power of the leaked local signal contained in the other transmit signal from the brancher 119. The amplitude-phase determiner 113b may output a set value for amplitude and / or a set value for phase, or it may output an amplitude adjustment amount which is the difference between the amplitude value of the local signal and the set value for amplitude, and / or a phase adjustment amount which is the difference between the phase value of the local signal and the set value for phase. The amplitude-phase adjuster 113a generates a cancellation signal by setting the amplitude and / or phase determined by the amplitude-phase determiner 113b to the local signal.

[0026] Two specific examples of the amplitude phase determiner 113b are shown in Figures 6 and 7. In the example shown in Figure 6, the transmitting signal generator 1 further includes a splitter 121, and the amplitude phase determiner 113b includes a mixer 113b1, a DC detector 113b2, and a calculator 113b3. In this example, the splitter 121 generates the frequency f generated by the second frequency multiplier 117b. LOThe cancellation signal having is split into two. The transmitting signal generator 1 may include a distributor instead of the splitter 121. The combiner 115 combines the transmitting signal that has passed through the filter 105 with one of the cancellation signals from the splitter 121. The mixer 113b1 mixes the other transmitting signal from the splitter 119 with the other cancellation signal from the splitter 121. If the other transmitting signal from the splitter 119 contains a leaky local signal, the output of the mixer 113b1 will contain a DC component. The DC detector 113b2 includes, for example, a low-pass filter and a DC detector. The DC detector detects a DC voltage from the output of the mixer 113b1. The arithmetic unit 113b3 determines the amplitude and / or phase that minimizes the detected DC voltage. For example, the arithmetic unit 113b3 first determines the phase that minimizes the DC voltage while fixing the amplitude, and then determines the amplitude that minimizes the DC voltage under the determined phase. The amplitude-phase adjuster 113a generates a cancellation signal by setting the amplitude and phase determined by the arithmetic unit 113b3 as the local signal.

[0027] In the example shown in Figure 7, the transmitting signal generator 1 further includes a splitter 121, and the amplitude phase determiner 113b includes a 90-degree phase shifter 113b4, a 90-degree hybrid coupler 113b5, an AC detector 113b6, and an arithmetic unit 113b7. In this example, the splitter 121 generates the frequency f generated by the second frequency multiplier 117b. LOThe cancellation signal has two branches. The transmitting signal generator 1 may include a distributor instead of the branch 121. The combiner 115 combines the transmitting signal that has passed through the filter 105 with one of the cancellation signals from the branch 121. The 90-degree phase shifter 113b4 shifts the phase of the other cancellation signal from the branch 121 by 90 degrees. The 90-degree hybrid coupler 113b5 performs power combining of the other transmitting signal from the branch 119 and the 90-degree phase shifted cancellation signal from the 90-degree phase shifter 113b4. If the other transmitting signal from the branch 119 contains a leaky local signal, one of the two outputs of the 90-degree hybrid coupler 113b5 contains an AC component (the result of power combining the leaky local signal and the 90-degree phase shifted cancellation signal in the other transmitting signal from the branch 119). The AC detector 113b6 detects an AC voltage from the output of the 90-degree hybrid coupler 113b5. The arithmetic unit 113b7 determines the amplitude and / or phase that minimizes the detected AC voltage. For example, the arithmetic unit 113b7 first determines the phase that minimizes the AC voltage with a fixed amplitude, and then determines the amplitude that minimizes the AC voltage under the determined phase. The amplitude-phase adjuster 113a generates a cancellation signal by setting the amplitude and phase determined by the arithmetic unit 113b7 as the local signal.

[0028] <Addendum 1> The technical features disclosed in the various embodiments and their variations described above are not necessarily mutually exclusive. To the extent that they do not contradict each other from a technical standpoint, the technical features of one embodiment or its variation may be applied to the technical features of another embodiment or its variation.

[0029] The claims set forth in the claims of this application at the time of filing do not necessarily claim all inventions disclosed in this specification. In this regard, the applicant of this application should not be understood or interpreted as having waived the right to obtain a patent for inventions not claimed at the time of filing this application. To the extent permitted by the laws or treaties of the country or region that receives this application, the applicant of this application reserves the right to obtain a patent for inventions not claimed in this application, the right to file a divisional application for such inventions, the right to claim such inventions by amendment, and all other rights. However, this shall not apply if the applicant of this application expresses an explicit and definitive contrary intention.

[0030] An example of a summary of this disclosure from a different perspective is as follows:

[0031] The first invention is a transmission signal generation device that generates a transmission signal from an input signal by heterodyne, A local signal generator that generates local signals, A frequency converter that generates a transmission signal by mixing the input signal and the local signal, A cancellation signal generator that generates a cancellation signal from a local signal to cancel out leaked local signals that originate from the local signal and are included in the transmitted signal, It includes a combiner that combines the transmitted signal and the canceled signal.

[0032] The second invention is, in the first invention, Includes a filter to suppress unwanted signals that occur when the input signal and local signal are mixed, Leaked local signals are not completely attenuated by the filter. It is characterized by the following:

[0033] The third invention is, in the first or second invention, A first frequency multiplier that multiplies the local signal by N, A second multiplier that multiplies the cancellation signal by N, and It is characterized by including.

[0034] The fourth invention is, in any of the first to third inventions, The cancellation signal generator, An amplitude-phase determiner that determines the amplitude and / or phase to be set for the local signal from the leaked local signal, An amplitude-phase adjuster generates a cancellation signal by setting the amplitude and / or phase determined by the amplitude-phase determiner to the local signal, and It is characterized by including.

[0035] The fifth invention is, in the fourth invention, The amplitude phase determiner, Determine the amplitude and / or phase of the local signal so that the DC component obtained by mixing the cancellation signal and the leaked local signal is minimized. It is characterized by the following:

[0036] The sixth invention is, in the fourth invention, The amplitude phase determiner, Determine the amplitude and / or phase of the local signal so that the AC component obtained by combining the cancellation signal and the leaked local signal is minimized. It is characterized by the following:

[0037] <Addendum 2> While the present invention has been described with reference to exemplary embodiments, those skilled in the art will understand that various modifications can be made and elements can be replaced with equivalents without departing from the scope of the invention. Furthermore, many modifications can be made to adapt a particular system, device, or component thereof to the teachings of the invention without departing from the essential scope of the invention. Thus, the present invention is not limited to the specific embodiments disclosed for the purpose of carrying out the invention, but includes all embodiments that fall within the scope of the appended claims.

[0038] Furthermore, the use of terms such as “first,” “second,” etc. (ordinal numbers) does not indicate order or importance, if any; rather, terms such as “first,” “second,” etc. (ordinal numbers) are used to distinguish elements. The terms used herein are for the purpose of describing embodiments and are not intended in any way to limit the invention. The terms “including” and their variations, when used herein and / or in the appended claims, indicate the existence of the mentioned features, steps, operations, elements, and / or components, but do not exclude the existence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof. The terms “and / or” include, if any, any combination of one or more of the listed elements relating. Unless otherwise specified in the claims and specification, “connected,” “joined,” “joined,” “linked,” or their synonyms, and all their forms, do not necessarily negate the existence of one or more intermediate elements between two that are, for example, “connected” or “joined” or “linked” to one another. In the claims and description, the term “optional” should be understood to mean the same as the universal quantifier ∀, if any, unless otherwise specified.

[0039] Unless otherwise specified, all terms used herein (including technical and scientific terms) have the same meaning as those generally understood by those skilled in the art to which the present invention pertains. Furthermore, terms such as those defined in commonly used dictionaries should be construed to have the meaning consistent with their meanings in the relevant art and in the context of this disclosure, and should not be construed ideally or excessively formally unless expressly defined.

[0040] It will be understood that many techniques and steps are disclosed in the description of this invention. Each of these has its own advantages, and each can be used in combination with one or more, or possibly all, of the other disclosed techniques. Therefore, to avoid complexity, this specification refrains from describing every possible combination of individual techniques or steps. Nevertheless, the specification and claims should be read with the understanding that such combinations are entirely within the scope of the invention and claims.

[0041] In the following claims, all corresponding structures, materials, actions, and equivalents of functional elements combined with means or steps are intended to include structures, materials, or actions for performing a function in combination with other elements, if any.

[0042] While embodiments of the present invention have been described above, the present invention is not limited to these embodiments. Various modifications and variations are permitted without departing from the spirit of the invention. The selected and described embodiments are for illustrating the principles of the present invention and its practical applications. The present invention can be used in various embodiments with various modifications or variations, and the various modifications or variations will be determined according to the expected use. All such modifications and variations are intended to fall within the scope of the present invention as defined by the appended claims and are intended to be given the same protection when interpreted in accordance with the fair, lawful and equitable breadth. [Explanation of Symbols]

[0043] 1. Transmitting signal generation device 10 Modulators 20 Transmitting Antennas 90. Transmitting signal generator 101 Frequency Converter 103 Local signal generator 105 filters 107 Amplifier 111 Turnout 113 Cancellation signal generator 113a Amplitude Phase Adjuster 113b Amplitude Phase Determinator 113b1 Mixer 113b2 DC detector 113b3 Arithmetic unit 113b4 90 degree phase shifter 113b5 90-degree hybrid coupler 113b6 AC detector 113b7 Arithmetic unit 115 Synthesizer 117a 1st multiplier 117b 2nd multiplier 119 Turnout 121 Turnout 800 Wireless Transmitter 900 Wireless Transmitter

Claims

1. A transmission signal generation device that generates a transmission signal from an input signal by heterodyne, A local signal generator that generates local signals, A frequency converter that generates the above-mentioned transmission signal by mixing the above-mentioned input signal and the above-mentioned local signal, A cancellation signal generator that generates a cancellation signal from the local signal that originates from the local signal and is included in the transmitted signal, cancels the leaked local signal. A combiner that combines the above transmission signal and the above cancellation signal Includes, The above cancellation signal generator, An amplitude-phase determiner that determines the amplitude and / or phase to be set for the above local signal from the above leaked local signal, An amplitude-phase adjuster generates the cancellation signal by setting the amplitude and / or phase determined by the above amplitude-phase determiner to the above local signal. Includes, The above amplitude phase determiner, The amplitude and / or phase of the local signal are determined such that the DC component obtained by mixing the above cancellation signal and the above leakage local signal is minimized. A transmission signal generation device characterized by the following features.

2. A transmission signal generation device that generates a transmission signal from an input signal by heterodyne, A local signal generator that generates local signals, A frequency converter that generates the above-mentioned transmission signal by mixing the above-mentioned input signal and the above-mentioned local signal, A cancellation signal generator that generates a cancellation signal from the local signal that originates from the local signal and is included in the transmitted signal, cancels the leaked local signal. A combiner that combines the above transmission signal and the above cancellation signal Includes, The above cancellation signal generator, An amplitude-phase determiner that determines the amplitude and / or phase to be set for the above local signal from the above leaked local signal, An amplitude-phase adjuster generates the cancellation signal by setting the amplitude and / or phase determined by the above amplitude-phase determiner to the above local signal. Includes, The above amplitude phase determiner, The amplitude and / or phase set for the local signal are determined such that the AC component obtained by combining the above cancellation signal and the above leakage local signal is minimized. A transmission signal generation device characterized by the following features.

3. In the transmission signal generation device according to claim 1 or claim 2, Includes a filter for suppressing unwanted signals generated by mixing the above input signal and the above local signal, The above-mentioned leaked local signal is not completely attenuated by the above-mentioned filter. A transmission signal generation device characterized by the following features.

4. A transmission signal generator that generates a transmission signal from an input signal by heterodyne, A local signal generator that generates local signals, A first multiplier that multiplies the above local signal by N, A frequency converter that generates the transmission signal by mixing the above input signal and the signal from the above first frequency multiplier, A cancellation signal generator that generates a cancellation signal from the local signal that originates from the local signal and is included in the transmitted signal, cancels the leaked local signal. A second multiplier that multiplies the above cancellation signal by N, A combiner that combines the above transmission signal and the above cancellation signal Includes, The above cancellation signal generator, An amplitude-phase determiner that determines the amplitude and / or phase to be set for the above local signal from the above leaked local signal, An amplitude-phase adjuster generates the cancellation signal by setting the amplitude and / or phase determined by the above amplitude-phase determiner to the above local signal. Includes, The above amplitude phase determiner, The amplitude and / or phase of the local signal are determined such that the DC component obtained by mixing the signal from the second multiplier and the leaked local signal is minimized. A transmission signal generation device characterized by the following features.

5. A transmission signal generator that generates a transmission signal from an input signal by heterodyne, A local signal generator that generates local signals, A first multiplier that multiplies the above local signal by N, A frequency converter that generates the transmission signal by mixing the above input signal and the signal from the above first frequency multiplier, A cancellation signal generator that generates a cancellation signal from the local signal that originates from the local signal and is included in the transmitted signal, cancels the leaked local signal. A second multiplier that multiplies the above cancellation signal by N, A combiner that combines the above transmission signal and the above cancellation signal Includes, The above cancellation signal generator, An amplitude-phase determiner that determines the amplitude and / or phase to be set for the above local signal from the above leaked local signal, An amplitude-phase adjuster generates the cancellation signal by setting the amplitude and / or phase determined by the above amplitude-phase determiner to the above local signal. Includes, The above amplitude phase determiner, The amplitude and / or phase of the local signal are determined such that the AC component obtained by combining the signal from the second multiplier and the leaked local signal is minimized. A transmission signal generation device characterized by the following features.

6. In the transmission signal generation device according to claim 4 or claim 5, It includes a filter for suppressing unwanted signals generated by mixing the above input signal with the signal from the above first multiplier, The above-mentioned leaked local signal is not completely attenuated by the above-mentioned filter. A transmission signal generation device characterized by the following features.

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