JP2011234026A - Waveform generator, signal generator comprising it, waveform generation method, and signal generation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waveform generator which generates an optional waveform pattern whose frequency shift is modulated and which can connect the phases of the beginning and the end of the generated waveform pattern, a signal generator comprising it, a waveform generation method, and a signal generation method.SOLUTION: A waveform generator 10 comprises: a waveform data generation part 12 for generating optional waveform data; a symbol mapping part 14 which seeks a connection phase-difference from the result of mapping the generation waveform data input from the waveform data generation part 12 on the IQ plane based on the FSK modulation formula; a correction value calculation part 15 for calculating the distribution phase correction value which make the connection phase difference zero and for calculating the frequency correction data; a phase correction part 16 for distributing the distribution phase correction value calculated by the correction value calculation part 15 to all the symbols of the generation waveform data and for correcting the phase of each symbol.

Description

  The present invention relates to a waveform generator that generates a waveform of a frequency shift keying (FSK) signal used in, for example, a mobile radio communication apparatus, a signal generator including the waveform generator, a waveform generation method, and a signal generation method. About.

  In recent years, in the field of commercial mobile radio communication devices, the frequency band per channel has been narrowed and digitized from the viewpoint of frequency utilization efficiency. In digitization, the FSK modulation method is often adopted because of coexistence with existing analog wireless communication devices, diversion of existing equipment, ease of control, and the like.

  When testing a mobile radio communication device or the like that employs the FSK modulation method, for example, a waveform generator that stores waveform pattern data of an FSK signal in a memory unit and repeatedly reproduces the FSK signal of the stored waveform pattern. Used.

  However, under test conditions for testing mobile radio communication devices and the like, the period of the FSK signal, the data length of the waveform pattern, and the like are determined by the standard and cannot be freely changed. Further, the capacity of the memory unit for storing the waveform pattern data is also limited. For this reason, in the conventional waveform generator, normally, a phenomenon occurs in which the phase becomes discontinuous at the connection portion connecting the beginning and the end of the waveform pattern and the phase does not change smoothly. Specifically, when the FSK signal of the waveform pattern stored in the memory unit is reproduced twice, as shown in FIG. 7, the connection between the waveform pattern of the first reproduction and the waveform pattern of the second reproduction is performed. It was normal for the phase to become discontinuous at the part.

  If the phase becomes discontinuous at the connection part of the waveform pattern, spurious will occur at the discontinuous part of the phase in mobile radio communication equipment, etc. The reception sensitivity test or the like cannot be performed accurately. Therefore, as shown in FIG. 8, it is necessary to make the phase continuous so that the phase smoothly changes at the connection portion of the waveform pattern. 7 and 8, the solid line waveform indicates the I-phase component (in-phase component), and the broken line waveform indicates the Q-phase component (orthogonal component).

  In view of the above-described circumstances, an arbitrary waveform signal generator that generates an FSK signal having a waveform pattern in which the phase of a connection portion is continuous has been proposed (see, for example, Patent Document 1). This arbitrary waveform signal generator includes a digital data generator that repeatedly outputs a PN (Pseudo-Noise) signal, and correction means that divides and adds a correction value to each bit of output data of the digital data generator. The FSK signal in which the phases of the connecting portions are continuous can be generated.

JP 2002-44170 A

  However, the technique disclosed in Patent Document 1 generates an FSK signal based only on PN sequence data, and has a problem that an FSK signal having a waveform pattern other than the PN sequence data cannot be generated.

  The present invention has been made in order to solve the conventional problems, and generates a waveform pattern that has been subjected to frequency shift modulation, and a waveform that can make the leading and trailing phases of the generated waveform pattern continuous. It is an object of the present invention to provide a generator, a signal generation apparatus including the generator, a waveform generation method, and a signal generation method.

  The waveform generator according to claim 1 of the present invention comprises a waveform data generating means (12) for generating data of an arbitrary waveform pattern having a predetermined data length, and frequency shift modulation of the waveform pattern data. A symbol is generated, and an inter-symbol phase difference obtaining means (14) for obtaining a phase difference between the first and last symbols of the waveform pattern data, and a phase correction value for making the inter-symbol phase difference zero are obtained. Phase correction value acquisition means (15a), and phase correction means (16) for correcting the phase of each symbol by dividing the phase correction value acquired by the phase correction value acquisition means into the number of symbols and distributing it to each symbol. And a frequency correction value calculation means (15b) for calculating a frequency correction value for making a frequency offset caused by correcting the phase of each symbol zero. Has a configuration was.

  With this configuration, in the waveform generator according to claim 1 of the present invention, the waveform data generation unit generates data of an arbitrary waveform pattern, and the phase correction value acquisition unit causes the inter-symbol phase difference to be zero. The phase correction value is obtained, and the phase correction means divides the phase correction value obtained by the phase correction value acquisition means into the number of symbols and distributes it to each symbol to correct the phase of each symbol. Therefore, the waveform generator according to claim 1 of the present invention can generate an arbitrary waveform pattern subjected to frequency shift modulation and can make the leading and trailing phases of the generated waveform pattern continuous.

  Also, with this configuration, the waveform generator according to claim 1 of the present invention calculates a frequency correction value for making the frequency offset generated by the frequency correction value calculating means correcting the phase of each symbol zero. Therefore, the top and bottom phases of an arbitrary waveform pattern can be made continuous without generating a frequency offset.

  In the waveform generator according to claim 2 of the present invention, the inter-symbol phase difference acquisition unit calculates the inter-symbol phase difference based on a result of arranging symbols generated by frequency shift keying on an orthogonal coordinate plane. It has the structure that is desired.

  With this configuration, the waveform generator according to the second aspect of the present invention can accurately determine the inter-symbol phase difference, so that the leading and trailing phases of an arbitrary waveform pattern can be reliably continued.

  A signal generator according to claim 3 of the present invention is a signal generator (30) comprising the waveform generator according to claim 1 or 2, and includes a symbol whose phase is corrected by the phase correction means. A memory unit (21) that stores waveform pattern data and repeatedly outputs from the first data to the last data of the stored waveform pattern, and the waveform pattern data output from the memory unit is a frequency of a predetermined radio frequency. A frequency conversion means (25) for converting the frequency into a shift modulation signal; and a radio frequency correction means (23) for correcting the radio frequency based on the frequency correction value calculated by the frequency correction value calculation means. have.

  With this configuration, the signal generator according to claim 3 of the present invention can generate a frequency shift keying signal in which the top and bottom phases of the waveform pattern are continuous.

  A waveform generation method according to a fourth aspect of the present invention includes a waveform data generation step for generating data of an arbitrary waveform pattern having a predetermined data length, and frequency shift modulation of the waveform pattern data to generate symbols. An inter-symbol phase difference obtaining step for obtaining a phase difference between the first and last symbols of the waveform pattern data, and a phase correction value obtaining step for obtaining a phase correction value for making the inter-symbol phase difference zero. A phase correction step of correcting the phase of each symbol by dividing the phase correction value acquired in the phase correction value acquisition step into the number of symbols and distributing it to each symbol; and correcting the phase of each symbol A frequency correction value calculating step for calculating a frequency correction value for making a generated frequency offset zero. There.

  With this configuration, the waveform generation method according to claim 4 of the present invention generates arbitrary waveform pattern data in the waveform data generation step, and sets the inter-symbol phase difference to zero in the phase correction value acquisition step. A phase correction value is obtained, and in the phase correction step, the phase correction value obtained in the phase correction value acquisition step is divided into the number of symbols and distributed to each symbol to correct the phase of each symbol. Therefore, the waveform generation method according to claim 4 of the present invention can generate an arbitrary waveform pattern that is frequency shift modulated, and can make the leading and trailing phases of the generated waveform pattern continuous.

  Also, with this configuration, the waveform generation method according to claim 4 of the present invention calculates a frequency correction value for making the frequency offset generated by correcting the phase of each symbol zero in the frequency correction value calculation step. Therefore, the top and bottom phases of an arbitrary waveform pattern can be made continuous without generating a frequency offset.

  In the waveform generation method according to claim 5 of the present invention, in the inter-symbol phase difference obtaining step, the inter-symbol phase difference is calculated based on a result of arranging symbols generated by frequency shift keying on an orthogonal coordinate plane. It has the required structure.

  With this configuration, the waveform generation method according to the fifth aspect of the present invention can accurately obtain the inter-symbol phase difference, so that the leading and trailing phases of an arbitrary waveform pattern can be reliably continued.

  A signal generation method according to claim 6 of the present invention is a signal generation method including each step in the waveform generation method according to claim 4 or 5, wherein the waveform includes a symbol whose phase is corrected in the phase correction step. A data output step for storing pattern data and repeatedly outputting from the first data to the last data of the stored waveform pattern, and the waveform pattern data output in the data output step is a frequency shift of a predetermined radio frequency. A frequency conversion step for converting the frequency into a modulation signal; and a radio frequency correction step for correcting the radio frequency based on the frequency correction value calculated in the frequency correction value calculation step.

  With this configuration, the signal generation method according to claim 6 of the present invention can generate a frequency shift key modulation signal in which the leading and trailing phases of the waveform pattern are continuous.

  The present invention relates to a waveform generator having an effect of generating an arbitrary waveform pattern subjected to frequency shift modulation and making it possible to make the leading and trailing phases of the generated waveform pattern continuous, and a signal generator having the waveform generator In addition, a waveform generation method and a signal generation method can be provided.

It is a block diagram of the waveform generator in 1st Embodiment of this invention. It is a figure which shows the data which a symbol mapping part maps in 1st Embodiment of this invention. It is explanatory drawing of the phase correction of the symbol which a phase correction part performs in 1st Embodiment of this invention. In 1st Embodiment of this invention, it is a figure which shows the example of a waveform of the I phase component of the FSK signal before and behind phase correction. In 1st Embodiment of this invention, it is a figure which shows the example of a waveform of the Q phase component of FSK signal before and behind phase correction. It is a block diagram of the signal generator in 2nd Embodiment of this invention. It is a figure which shows the example from which the phase is discontinuous in the connection part of a waveform pattern. It is a figure which shows the example in which the phase is continuing in the connection part of a waveform pattern.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
First, the configuration of the waveform generator in the first embodiment of the present invention will be described.

  As shown in FIG. 1, the waveform generator 10 in this embodiment includes an operation unit 11, a waveform data generation unit 12, a memory unit 13, a symbol mapping unit 14, a correction value calculation unit 15, a phase correction unit 16, and a filter unit 17. The frequency converter 18 is provided. Although not shown, the waveform generator 10 includes a CPU that controls the overall operation of the waveform generator 10 and a control circuit that includes a ROM, a RAM, and the like that store a program for causing the CPU to function. ing.

  The operation unit 11 is operated by a user in order to set parameters for generating waveform data. For example, although not shown, the operation unit 11 includes a display that displays a setting screen for setting parameters, an input device such as a keyboard, a dial, or a mouse, and a control circuit that controls these devices. Yes.

  The waveform data generation unit 12 generates binary waveform pattern data having a predetermined data length based on parameters input by the user operating the operation unit 11. The waveform data generation unit 12 constitutes waveform data generation means according to the present invention.

  The memory unit 13 is constituted by a RAM, for example, and stores mapping data as will be described later.

  The symbol mapping unit 14 receives waveform pattern data generated by the waveform data generation unit 12 (hereinafter referred to as “generated waveform data”), and generates a symbol by FSK modulation of the generated waveform data. Yes. The symbol mapping unit 14 maps (arranges) the generated symbols on the IQ plane. The mapped data is stored in the memory unit 13. Here, the symbol mapping unit 14 constitutes an inter-symbol phase difference acquisition unit according to the present invention.

  Specifically, in the present embodiment, it is assumed that the symbol mapping unit 14 generates and maps symbols based on the 4-level FSK modulation scheme. That is, as shown in FIG. 2A, the symbol mapping unit 14 selects any one of 2-bit combinations “01”, “00”, “10”, and “11” according to the input signal. In this case, symbols are mapped onto the IQ plane shown in FIG. Here, the symbol rate is assumed to be 2.4 ksps (kilo symbol per second). The frequency shift value is +900 Hz for the bit value “01” (symbol value +3), +300 Hz for the bit value “00” (symbol value + 1), −300 Hz for the bit value “10” (symbol value−1), and the bit. The value “11” (symbol value −3) is −900 Hz.

  Further, the symbol mapping unit 14 obtains a phase difference (hereinafter referred to as “connecting unit phase difference”) between the first symbol and the last symbol in the generated waveform data based on the result of mapping the symbols on the IQ plane. The obtained connection portion phase difference data is output to the correction value calculation portion 15.

The correction value calculation unit 15 includes a phase correction value acquisition unit 15a and a frequency correction value calculation unit 15b. The phase correction value acquisition unit 15a equally distributes the connection portion phase difference obtained by the symbol mapping unit 14 to all the symbols of the generated waveform data to make the connection portion phase difference zero (hereinafter, “distribution phase correction value”). Is calculated by the following equation (1). Here, Δθ is the distribution phase correction value, θc is the connecting portion phase difference, and N is the number of symbols when the generated waveform data is modulated by the four-value FSK modulation method.
Δθ = −θc / N (1)

Further, the frequency correction value calculation unit 15b calculates a frequency offset generated by distributing the distribution phase correction value Δθ to all symbols of the generated waveform data by the following equation (2). Here, Δf represents a frequency offset, and R represents a symbol rate.
Δf = −θc · R / (2π · N) (2)

  Further, the correction value calculation unit 15 outputs the data of the distribution phase correction value Δθ to the phase correction unit 16 and outputs the data of the frequency offset Δf to the device connected to the waveform generator 10 as frequency correction data. It is supposed to be. The phase correction value acquisition unit 15a and the frequency correction value calculation unit 15b of the correction value calculation unit 15 constitute a phase correction value acquisition unit and a frequency correction value calculation unit according to the present invention, respectively.

  The phase correction unit 16 reads the mapping data of the generated waveform data from the memory unit 13, distributes the distribution phase correction value Δθ calculated by the correction value calculation unit 15 to all symbols of the generated waveform data, and corrects the phase of each symbol. To do. The phase correction unit 16 constitutes a phase correction unit according to the present invention.

  This will be specifically described with reference to FIG. Black dots shown in FIG. 3 indicate mapping data of one symbol among all symbols of the generated waveform data, and the phase thereof is θ with respect to the I-phase axis. When the distribution phase correction value Δθ calculated by the correction value calculation unit 15 is a positive value, the phase correction unit 16 corrects the phase of this symbol to θ + Δθ. As a result, the corrected symbol point is the position of the white circle. The mapping data whose phase has been corrected is stored in the memory unit 13 and read by the phase correction unit 16.

  The filter unit 17 limits the band of the signal phase-corrected by the phase correction unit 16. As a result, the noise component is removed, and the output signal of the filter unit 17 changes smoothly between symbols.

  The frequency converting unit 18 converts each symbol value of the output signal of the filter unit 17 into a waveform having a frequency corresponding to the value, and outputs the converted waveform data.

  Next, the operation of the waveform generator 10 in this embodiment will be described.

  When the user operates the operation unit 11, a waveform parameter for generating waveform data is set.

  The waveform data generation unit 12 receives waveform parameter data from the operation unit 11 and generates binarized waveform data having a predetermined data length (waveform data generation step).

  The symbol mapping unit 14 receives the generated waveform data from the waveform data generation unit 12, generates a symbol by performing FSK modulation on the input generated waveform data, and maps the generated symbol on the IQ plane. Then, the symbol mapping unit 14 obtains the connection unit phase difference θc based on the result of mapping the symbols on the IQ plane (inter-symbol phase difference acquisition step). In the following description, it is assumed that the number N of symbols for one period of the generated waveform data is N = 511, and that the connecting portion phase difference θc = −π / 4 occurs under the conditions shown in FIG. In this case, the symbol mapping unit 14 acquires + π / 4 as a phase correction value (= −θc) for setting the connection unit phase difference θc to zero (phase correction value acquisition step).

  The correction value calculation unit 15 receives the phase correction value data for making the connecting portion phase difference θc zero from the symbol mapping unit 14, and calculates the distribution phase correction value Δθ based on the above-described equation (1) ( Phase correction value acquisition step). As a result, a distribution phase correction value Δθ = + π / 2044 is obtained. Further, the correction value calculation unit 15 calculates the frequency offset Δf based on the above-described equation (2). As a result, a frequency offset Δf = + 0.587 Hz is obtained. The correction value calculation unit 15 outputs the data of the distribution phase correction value Δθ to the phase correction unit 16 and outputs the data of the frequency offset Δf as frequency correction data to a device connected to the waveform generator 10 ( Frequency correction value calculation step).

  The phase correction unit 16 reads the mapping data of the generated waveform data from the memory unit 13, distributes the distribution phase correction value Δθ (= + π / 2044) calculated by the correction value calculation unit 15 to all symbols of the generated waveform data, Phase correction of each symbol is performed (phase correction step).

  The filter unit 17 band-limits the signal phase-corrected by the phase correction unit 16 and outputs the band-limited signal to the frequency conversion unit 18.

  The frequency conversion unit 18 converts each symbol value of the output signal of the filter unit 17 into a waveform having a frequency corresponding to the value, and outputs the converted waveform data. For example, when the filter unit 17 outputs a signal having a symbol value +3 under the conditions shown in FIG. 2A, the frequency conversion unit 18 outputs waveform data indicating the frequency shift value +900 Hz for 1/2400 seconds.

  Next, the waveform pattern obtained by the waveform generator 10 in this embodiment will be described. 4 and 5 are examples of waveform diagrams of the I-phase component and Q-phase component of the FSK signal before and after phase correction output from the filter unit 17, respectively. 4 and 5, the output signal of the filter unit 17 is illustrated as being reproduced twice in order to illustrate the phase state at the connection portion between the beginning and the end of the waveform pattern. As shown in FIGS. 4 and 5, the phase is discontinuous at the connection part before phase correction (broken line), but the phase continuously changes smoothly at the connection part after phase correction (solid line). The waveform is

  As described above, the waveform generator 10 in this embodiment has a configuration including the waveform data generation unit 12 that generates arbitrary waveform data of the FSK signal desired by the user. Further, in the waveform generator 10, the correction value calculation unit 15 calculates a distribution phase correction value from the connection unit phase difference obtained by the symbol mapping unit 14, calculates and outputs frequency correction data, and the phase correction unit 16 The distribution phase correction value calculated by the correction value calculation unit 15 is distributed to all symbols of the generated waveform data to perform phase correction of each symbol. Therefore, the waveform generator 10 can generate an arbitrary waveform pattern of the FSK signal and can make the leading and trailing phases of the generated waveform pattern continuous.

  Further, the waveform generator 10 in this embodiment calculates a frequency correction value for making the frequency offset generated by the correction value calculation unit 15 correcting the phase of each symbol zero, and is connected to the waveform generator 10. Output to the selected device. Therefore, the waveform generator 10 can make the leading and trailing phases of an arbitrary waveform pattern continuous without generating a frequency offset caused by correcting the phase of each symbol.

  In the above-described embodiment, the symbol mapping unit 14 obtains the connection portion phase difference by mapping the symbol on the IQ plane. However, the present invention is not limited to this, and the connection portion phase difference is calculated. If it can be obtained, the connection phase difference may be obtained without mapping to the IQ plane.

(Second Embodiment)
First, the structure of the signal generator in 2nd Embodiment of this invention is demonstrated.

  As shown in FIG. 6, the signal generator 30 in this embodiment includes a waveform generator 10 and a signal generator 20. In addition, since the waveform generator 10 was demonstrated in 1st Embodiment (refer FIG. 1), the overlapping description is abbreviate | omitted.

  The signal generator 20 includes a memory unit 21, a DAC (Digital Analog Converter) 22, a local signal oscillator 23, an operation unit 24, a mixer 25, and an amplifier 26. The signal generator 20 inputs the FSK signal of the waveform data generated by the waveform generator 10 as a baseband signal, and up-converts this to generate a RF (radio frequency) signal to the device under test (for example, a mobile radio communication device). Is output.

  Although not shown, the signal generator 20 includes a CPU that controls the overall operation of the signal generator 20 and a control circuit that includes a ROM, a RAM, and the like that store a program for causing the CPU to function. ing. By this control circuit, data in the memory unit 21 is repeatedly reproduced and output to the device under test, and a reception sensitivity test of the device under test is performed.

  The memory unit 21 receives waveform data from the frequency conversion unit 18 and stores it. In the present embodiment, the data length of the waveform data stored in the memory unit 21 is set by the operation unit 11 of the waveform generator 10 so that the data length is within the capacity of the memory unit 21.

  The DAC 22 converts the digital waveform data stored in the memory unit 21 into analog waveform data.

  The local signal oscillator 23 receives the frequency correction data from the correction value calculation unit 15 of the waveform generator 10 and the parameter data set by the operation unit 24 to be described later, and outputs an RF signal having a center frequency subjected to frequency correction. A local oscillation signal for generation is generated and output to the mixer 25. Here, the local signal oscillator 23 constitutes a radio frequency correction unit according to the present invention.

  The operation unit 24 is operated by the user to set parameters for determining the center frequency of the RF signal (or the oscillation frequency of the local signal oscillator 23), the amplitude, and the like. For example, the operation unit 24 may have the function of the operation unit 11 included in the waveform generator 10 and the user may operate the operation unit 24 to input parameters for generating waveform data.

  The mixer 25 multiplies the signal from the DAC 22 and the signal from the local signal oscillator 23 to frequency-convert the signal to an RF signal having a predetermined frequency, and outputs the RF signal to the amplifier 26. Here, the mixer 25 constitutes the frequency conversion means according to the present invention.

  The amplifier 26 amplifies the RF signal output from the mixer 25 with a predetermined amplification factor and outputs the amplified signal to the device under test.

  Next, the operation of the signal generator 30 in this embodiment will be described. In the following description of the operation, it is assumed that the user operates the operation unit 24 in advance to set the center frequency of the RF signal (or the local oscillation frequency of the local signal oscillator 23). Since the operation of the waveform generator 10 has been described in the first embodiment, only the operation related to this embodiment will be described.

  In the waveform generator 10, the waveform data generation unit 12 generates waveform data having a data length corresponding to the capacity of the memory unit 21 of the signal generator 20. Further, the correction value calculation unit 15 calculates the frequency offset Δf and outputs this data to the local signal oscillator 23 as frequency correction data. Further, the frequency conversion unit 18 converts each symbol value of the output signal of the filter unit 17 into waveform data having a frequency corresponding to the value, and outputs the converted waveform data to the memory unit 21.

  In the signal generator 20, the memory unit 21 stores the waveform data from the frequency conversion unit 18. The stored waveform data is repeatedly reproduced by a control circuit (not shown) with one cycle from the beginning to the end of the waveform pattern, and is output to the DAC 22 (data output step).

  The DAC 22 converts the digital waveform data output from the memory unit 21 into analog waveform data and outputs the analog waveform data to the mixer 25.

  The mixer 25 multiplies the signal from the DAC 22 and the signal from the local signal oscillator 23 and converts the frequency into an RF signal having a predetermined center frequency (frequency conversion step). Here, the local signal oscillator 23 receives the frequency correction data indicating the frequency offset Δf from the correction value calculation unit 15, and the local oscillation in which the center frequency of the RF signal set by the user via the operation unit 24 is obtained. The signal is output to the mixer 25 (radio frequency correction step). For example, under the conditions shown in FIG. 2A, the frequency offset when the connecting portion phase difference θc = −π / 4 occurs is Δf = + 0.587 Hz. If the center frequency of F is F, the local signal oscillator 23 outputs to the mixer 25 a local oscillation signal where the center frequency of the RF signal = F−0.587 Hz. Here, a specific example of the center frequency F of the RF signal is F = 150 MHz or F = 400 MHz.

  The RF signal output from the mixer 25 is input to the amplifier 26. The amplifier 26 amplifies the RF signal from the mixer 25 with a predetermined amplification factor and outputs the amplified signal to the device under test.

  As described above, according to the signal generation device 30 in the present embodiment, the memory unit 21 inputs and stores the waveform data in which the top and bottom phases of the waveform pattern are continuous from the frequency conversion unit 18, and then stores the waveform data. Since the data is repeatedly output to the DAC 22 and the mixer 25 is configured to multiply the signal from the DAC 22 and the signal from the local signal oscillator 23 and convert the frequency to an RF signal having a predetermined center frequency, an arbitrary waveform pattern is obtained. Can generate an FSK signal in which the leading and trailing phases are continuous.

  In the signal generator 30 according to the present embodiment, the local signal oscillator 23 corrects the intermediate frequency of the RF signal set by the operation unit 24 based on the frequency correction data from the correction value calculation unit 15. It is possible to automatically correct a frequency shift occurring in the processing.

  In the above-described embodiment, the local signal oscillator 23 automatically corrects the frequency offset Δf generated by distributing the distribution phase correction value Δθ to all symbols of the generated waveform data. However, the present invention is not limited to this, and for example, a display unit that displays the value of the frequency offset Δf may be provided in the signal generator 20 so that the user can manually correct the local oscillation frequency. .

  As described above, the waveform generator, the signal generation apparatus including the waveform generator, the waveform generation method, and the signal generation method according to the present invention generate an arbitrary waveform pattern subjected to frequency shift modulation, and the head of the generated waveform pattern. Waveform generator for generating a waveform of an FSK signal used in a mobile radio communication device and the like, a signal generation apparatus including the waveform generator, a waveform generation method, and a signal It is useful as a generation method.

DESCRIPTION OF SYMBOLS 10 Waveform generator 11 Operation part 12 Waveform data generation part (waveform data generation means)
13 memory unit 14 symbol mapping unit (inter-symbol phase difference acquisition means)
15 correction value calculation unit 15a phase correction value acquisition unit (phase correction value acquisition means)
15b Frequency correction value calculation unit (frequency correction value calculation means)
16 Phase correction unit (phase correction means)
17 Filter Unit 18 Frequency Conversion Unit 20 Signal Generator 21 Memory Unit 22 DAC
23 Local signal oscillator (radio frequency correction means)
24 operation section 25 mixer (frequency conversion means)
26 Amplifier 30 Signal generator

Claims (6)

Waveform data generation means (12) for generating data of an arbitrary waveform pattern having a predetermined data length;
Inter-symbol phase difference obtaining means (14) for generating a symbol by frequency-shift-modulating the waveform pattern data to obtain a phase difference between the first and last symbols of the waveform pattern data;
Phase correction value acquisition means (15a) for obtaining a phase correction value for making the inter-symbol phase difference zero;
Phase correction means (16) that divides the phase correction value acquired by the phase correction value acquisition means into the number of symbols and distributes it to each symbol to correct the phase of each symbol;
A waveform generator, comprising: a frequency correction value calculating means (15b) for calculating a frequency correction value for making a frequency offset caused by correcting the phase of each symbol zero.   2. The inter-symbol phase difference obtaining unit obtains the inter-symbol phase difference based on a result of arranging symbols generated by frequency shift keying on an orthogonal coordinate plane. Waveform generator. A signal generator (30) comprising the waveform generator according to claim 1 or 2,
A memory unit (21) for storing waveform pattern data including a symbol whose phase has been corrected by the phase correction unit, and repeatedly outputting from the first data to the last data of the stored waveform pattern;
A frequency conversion means (25) for converting the waveform pattern data output from the memory unit into a frequency shift keying signal having a predetermined radio frequency;
And a radio frequency correction means (23) for correcting the radio frequency based on the frequency correction value calculated by the frequency correction value calculation means. A waveform data generation step for generating data of an arbitrary waveform pattern having a predetermined data length;
An inter-symbol phase difference obtaining step for generating a symbol by frequency-shift-modulating the waveform pattern data to obtain a phase difference between the first and last symbols of the waveform pattern data;
A phase correction value obtaining step for obtaining a phase correction value for making the inter-symbol phase difference zero; and
A phase correction step for correcting the phase of each symbol by dividing the phase correction value acquired in the phase correction value acquisition step into the number of symbols and distributing it to each symbol;
And a frequency correction value calculating step of calculating a frequency correction value for making a frequency offset caused by correcting the phase of each symbol zero.   5. The waveform generation method according to claim 4, wherein, in the inter-symbol phase difference obtaining step, the inter-symbol phase difference is obtained based on a result of arranging symbols generated by frequency shift modulation on an orthogonal coordinate plane. . A signal generation method comprising the steps of the waveform generation method according to claim 4 or 5,
A data output step of storing data of a waveform pattern including the symbol whose phase is corrected in the phase correction step, and repeatedly outputting from the head data to the tail data of the stored waveform pattern;
A frequency conversion step of converting the waveform pattern data output in the data output step into a frequency shift keying signal having a predetermined radio frequency;
And a radio frequency correction step of correcting the radio frequency based on the frequency correction value calculated in the frequency correction value calculation step.

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