WO2017085789A1 - Émetteur numérique - Google Patents

Émetteur numérique Download PDF

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Publication number
WO2017085789A1
WO2017085789A1 PCT/JP2015/082259 JP2015082259W WO2017085789A1 WO 2017085789 A1 WO2017085789 A1 WO 2017085789A1 JP 2015082259 W JP2015082259 W JP 2015082259W WO 2017085789 A1 WO2017085789 A1 WO 2017085789A1
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signal
circuit
modulation
digital
digital modulation
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PCT/JP2015/082259
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English (en)
Japanese (ja)
Inventor
英之 中溝
檜枝　護重
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三菱電機株式会社
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Priority to PCT/JP2015/082259 priority Critical patent/WO2017085789A1/fr
Priority to JP2017551425A priority patent/JP6351871B2/ja
Publication of WO2017085789A1 publication Critical patent/WO2017085789A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits

Definitions

  • the present invention relates to a digital transmitter for directly transmitting a digital modulation signal generated by a digital circuit such as a modem in a high frequency band.
  • Non-Patent Document 1 discloses a digital transmitter that directly transmits a digital modulation signal generated by a digital circuit such as a modem in a high frequency band.
  • the digital modulation signal generated by the modem is directly transmitted in the high frequency band, so that an analog circuit for converting the modulation signal in the baseband frequency band to the frequency in the high frequency band is not required, and the circuit configuration is simplified.
  • the digital modulation signal generated by the modem is delta-sigma-modulated and the digital signal after delta-sigma modulation is transmitted.
  • a ⁇ modulation circuit that outputs a modulation signal is mounted.
  • Non-Patent Document 2 below discloses a circuit configuration of a ⁇ modulation circuit.
  • the digital modulation signal generated by the modem can be transmitted directly in the high frequency band.
  • the digital modulation signal generated by the modem is delta-sigma modulated, ⁇ noise is generated in the vicinity of the desired modulation signal band. ) Deteriorated. Note that this ⁇ noise interferes with communication in adjacent channels and other communication in the adjacent frequency band, and causes deterioration in communication quality.
  • the present invention has been made to solve the above-described problems, and it is an object of the present invention to obtain a digital transmitter capable of reducing ⁇ noise accompanying delta-sigma modulation of a digital modulation signal and increasing a signal-to-noise ratio. Objective.
  • a digital transmitter modulates communication data to generate a digital modulation signal, and delta-sigma modulates the digital modulation signal generated by the modem and outputs a digital modulation signal after delta-sigma modulation.
  • the circuit configurations or operating conditions of the plurality of ⁇ modulation circuits are different, ⁇ noise associated with delta-sigma modulation of the digital modulation signal is reduced, and the signal-to-noise ratio is increased. There is an effect that can.
  • Embodiment 1 of this invention It is a block diagram which shows the digital transmitter by Embodiment 1 of this invention. It is a block diagram which shows the digital transmitter by Embodiment 2 of this invention. It is a block diagram which shows the digital transmitter by Embodiment 3 of this invention. It is a block diagram which shows the digital transmitter by Embodiment 4 of this invention. It is a block diagram which shows the delta-sigma modulation circuits 51 and 52 of the digital transmitter by Embodiment 4 of this invention. It is a block diagram which shows the delta-sigma modulation circuits 51 and 52 of the digital transmitter by Embodiment 5 of this invention. It is a block diagram which shows the modulation signal output circuit part 6 of the digital transmitter by Embodiment 6 of this invention.
  • FIG. 1 is a block diagram showing a digital transmitter according to Embodiment 1 of the present invention.
  • a modulation signal output circuit unit 1 is composed of a modem 11 and ⁇ modulation circuits 12 and 13, which modulate communication data to generate a digital modulation signal and delta-sigma modulate the digital modulation signal. It is.
  • the modem 11 modulates the communication data to generate a digital modulation signal, and outputs the digital modulation signal to the ⁇ modulation circuits 12 and 13.
  • the ⁇ modulation circuit 12 has a signal input terminal connected to a signal output terminal of the modem 11, and delta-sigma modulates the digital modulation signal output from the modem 11 and outputs a digital modulation signal after delta-sigma modulation. It is.
  • the ⁇ modulation circuit 13 has a signal input terminal connected to the signal output terminal of the modem 11 and has a circuit configuration different from that of the ⁇ modulation circuit 12, but the digital modulation output from the modem 11 is the same as the ⁇ modulation circuit 12.
  • the signal is delta-sigma modulated and a digitally modulated signal after delta-sigma modulation is output.
  • the high frequency unit 2 is a circuit composed of high frequency circuits 21 and 22 and a synthesis circuit 23.
  • the signal input terminal of the high frequency circuit 21 is connected to the signal output terminal of the ⁇ modulation circuit 12, and the signal power (signal level) of the digital modulation signal output from the ⁇ modulation circuit 12 is set to a desired power level (signal level).
  • the frequency of the digital modulation signal is converted from IF frequency (intermediate frequency) to RF frequency (radio frequency).
  • the high-frequency circuit 22 has a signal input terminal connected to a signal output terminal of the ⁇ modulation circuit 13, converts the signal power of the digital modulation signal output from the ⁇ modulation circuit 13 to a desired power level, and the digital modulation signal Is converted from IF frequency to RF frequency.
  • the high frequency circuits 21 and 22 convert the signal power of the digital modulation signal and the frequency, but either one of the signal power or the frequency conversion is converted. You can do it.
  • the high-frequency circuits 21 and 22 for example, an amplification circuit that inputs a 1-bit digital modulation signal and performs a switching operation, and a variable gain circuit that adjusts the signal power of the digital modulation signal to a desired power level
  • the circuit is composed of element circuits such as a frequency conversion circuit that converts the frequency of the digital modulation signal from IF frequency to RF frequency, and a filter circuit that suppresses unnecessary waves contained in the digital modulation signal.
  • another element circuit may be included.
  • the synthesizing circuit 23 has a first signal input terminal connected to a signal output terminal of the high frequency circuit 21 and a second signal input terminal connected to a signal output terminal of the high frequency circuit 22. The digital modulation signal and the digital modulation signal converted by the high frequency circuit 22 are combined to output a combined signal of the two digital modulation signals.
  • the modem 11 of the modulation signal output circuit unit 1 receives communication data including various kinds of information from the outside, the modem 11 modulates the communication data to generate a digital modulation signal, and the digital modulation signal is converted into the ⁇ modulation circuit 12. , 13 are output.
  • the digital modulation signal generated by the modem 11 for example, a digital modulation signal in which an amplitude value at each time of an analog modulation signal output from a general modem is represented by multiple bits can be considered.
  • the present invention is not limited to a multi-bit digital modulation signal.
  • the ⁇ modulation circuit 12 When receiving the digital modulation signal from the modem 11, the ⁇ modulation circuit 12 performs delta sigma modulation on the digital modulation signal and outputs the digital modulation signal after the delta sigma modulation to the high frequency circuit 21.
  • the ⁇ modulation circuit 13 When receiving the digital modulation signal from the modem 11, the ⁇ modulation circuit 13 performs delta sigma modulation on the digital modulation signal and outputs the digital modulation signal after the delta sigma modulation to the high frequency circuit 22.
  • the digital modulation signal after delta-sigma modulation output from the ⁇ modulation circuits 12 and 13 is a 1-bit or multi-bit digital modulation signal suitable for signal processing of the high-frequency circuits 21 and 22.
  • the characteristic of ⁇ noise generated when the ⁇ modulation circuits 12 and 13 perform delta-sigma modulation depends on the circuit configuration of the ⁇ modulation circuits 12 and 13. In the first embodiment, it is assumed that the circuit configurations of the ⁇ modulation circuit 12 and the ⁇ modulation circuit 13 are different. If the circuit configurations of the ⁇ modulation circuit 12 and the ⁇ modulation circuit 13 are different, the delta sigma is used. Since the modulation processing sequence is different, the characteristics of ⁇ noise are different. Thereby, the ⁇ noise component generated from the ⁇ modulation circuit 12 and the ⁇ noise component generated from the ⁇ modulation circuit 13 are incoherent.
  • the ⁇ modulation circuits 12 and 13 perform delta-sigma modulation on the same digital modulation signal output from the modem 11, the desired signal component of the digital modulation signal output from the ⁇ modulation circuit 12 and the ⁇ modulation are used.
  • the desired signal component of the digital modulation signal output from the circuit 13 is coherent.
  • Specific circuit configurations of the ⁇ modulation circuits 12 and 13 include a ⁇ modulation circuit in which the number of stages of a built-in ⁇ modulator described in a fourth embodiment described later is one, or a built-in circuit described in a fifth embodiment described later.
  • a ⁇ modulator circuit having two stages of ⁇ modulators is conceivable. For example, if the number of stages of the ⁇ modulator included in the ⁇ modulation circuit 12 is one and the number of stages of the ⁇ modulator included in the ⁇ modulation circuit 13 is 2, ⁇ generated from the ⁇ modulation circuit 12 The noise component and the ⁇ noise component generated from the ⁇ modulation circuit 13 become incoherent.
  • the high frequency circuit 21 When the high frequency circuit 21 receives the digital modulation signal after the delta sigma modulation from the ⁇ modulation circuit 12, the high frequency circuit 21 converts the signal power of the digital modulation signal into a desired power level and converts the frequency of the digital modulation signal from the IF frequency to the RF frequency. The frequency is converted to a frequency, and the converted digital modulation signal is output to the synthesis circuit 23.
  • the high frequency circuit 22 receives the digital modulation signal after delta-sigma modulation from the ⁇ modulation circuit 13
  • the high frequency circuit 22 converts the signal power of the digital modulation signal to a desired power level, and changes the frequency of the digital modulation signal from the IF frequency to the RF frequency.
  • the frequency is converted to a frequency, and the converted digital modulation signal is output to the synthesis circuit 23.
  • the converted digital modulation signal output from the high-frequency circuit 21 and the converted digital modulation signal output from the high-frequency circuit 22 have the same signal power and the same frequency.
  • the ⁇ noise component is incoherent, but the desired signal component of the digital modulation signal is coherent.
  • the combining circuit 23 combines the converted digital modulation signal output from the high frequency circuit 21 and the converted digital modulation signal output from the high frequency circuit 22 and outputs a combined signal of the two digital modulation signals. .
  • the desired signal components of the two digital modulation signals are coherent, the two desired signal components are voltage-added by the synthesis of the synthesis circuit 23.
  • the ⁇ noise components of the two digital modulation signals are incoherent, the ⁇ noise components of the two digital modulation signals are added by the synthesis of the synthesis circuit 23.
  • the signal-to-noise ratio which is the power ratio between the desired signal component and the ⁇ noise component in the combined signal output from the combining circuit 23, is the digital modulation signal output from each of the high frequency circuits 21 and 22.
  • the SNR of the desired signal component and the ⁇ noise component is theoretically improved by 3 dB.
  • the modem 11 that modulates communication data to generate a digital modulation signal, and the digital modulation signal generated by the modem 11 are delta-sigma modulated to produce a delta-sigma ⁇ modulation circuits 12 and 13 that output the modulated digital modulation signal, and the signal power of the digital modulation signal output from the ⁇ modulation circuits 12 and 13 is converted to a desired power level, and the frequency of the digital modulation signal is changed.
  • the high frequency circuits 21 and 22 for converting the IF frequency to the RF frequency, the digital modulation signal after the conversion by the high frequency circuit 21 and the digital modulation signal after the conversion by the high frequency circuit 22 are combined, and a combined signal of the two digital modulation signals And the circuit configuration of the ⁇ modulation circuits 12 and 13 is different. Since it is configured, by reducing the ⁇ noise associated with the delta-sigma modulation of digital modulation signals, an effect that can increase the SNR.
  • the modulation signal output circuit unit 1 includes two ⁇ modulation circuits 12 and 13 having different circuit configurations. However, the modulation signal output circuit unit 1 has a different circuit configuration.
  • the high-frequency unit 2 mounts N high-frequency circuits, and the combining circuit 23 combines the converted digital modulation signals output from the N high-frequency circuits. May be.
  • the high frequency unit 2 converts the signal power of the digital modulation signal output from the ⁇ modulation circuits 12 and 13 to a desired power level, and changes the frequency of the digital modulation signal from the IF frequency to the RF frequency.
  • the two digital modulation signals after the conversion are combined, and the digital modulation signals output from the ⁇ modulation circuits 12 and 13 are combined and then the combined signal of the two digital modulation signals. May be converted to a desired power level, and the frequency of the combined signal may be converted from the IF frequency to the RF frequency.
  • FIG. 2 is a block diagram showing a digital transmitter according to Embodiment 2 of the present invention.
  • the high frequency unit 3 is a circuit composed of a synthesis circuit 31 and a high frequency circuit 32.
  • the combining circuit 31 has a first signal input terminal connected to the signal output terminal of the ⁇ modulation circuit 12, and a second signal input terminal connected to the signal output terminal of the ⁇ modulation circuit 13.
  • the output digital modulation signal after delta sigma modulation and the digital modulation signal after delta sigma modulation output from the ⁇ modulation circuit 13 are combined, and a combined signal of the two digital modulation signals is output to the high frequency circuit 32.
  • the high frequency circuit 32 has a signal input terminal connected to a signal output terminal of the synthesis circuit 31, converts the signal power of the synthesis signal output from the synthesis circuit 31 to a desired power level, and converts the frequency of the synthesis signal to IF. Convert from frequency to RF frequency.
  • the high-frequency circuit 32 performs conversion of the signal power and frequency of the combined signal. However, any one of the conversion of signal power or frequency may be performed. Good.
  • the synthesizing circuit 31 synthesizes the digital modulation signal after the delta-sigma modulation output from the ⁇ modulation circuit 12 and the digital modulation signal after the delta-sigma modulation output from the ⁇ modulation circuit 13 to synthesize two digital modulation signals.
  • the combined signal is output.
  • the desired signal components of the two digital modulation signals are coherent, the two desired signal components are voltage-added by the synthesis of the synthesis circuit 31.
  • the synthesis of the synthesis circuit 31 causes the ⁇ noise components of the two digital modulation signals to be power addition.
  • the SNR that is the power ratio between the desired signal component and the ⁇ noise component in the combined signal output from the combining circuit 31 is equal to the desired signal component in the digital modulation signal output from each of the ⁇ modulation circuits 12 and 13 and ⁇ .
  • the theoretical improvement is 3 dB.
  • the high frequency circuit 32 When the high frequency circuit 32 receives the combined signal from the combining circuit 31, the high frequency circuit 32 converts the signal power of the combined signal into a desired power level and converts the frequency of the combined signal from the IF frequency to the RF frequency.
  • the modem 11 that modulates communication data to generate a digital modulation signal, and the digital modulation signal generated by the modem 11 are delta-sigma modulated to produce a delta-sigma ⁇ modulation circuits 12 and 13 for outputting the modulated digital modulation signal, the digital modulation signal after the delta-sigma modulation output from the ⁇ modulation circuit 12, and the digital modulation after the delta-sigma modulation output from the ⁇ modulation circuit 13 And combining the signal and outputting a combined signal of the two digital modulation signals, converting the signal power of the combined signal output from the combining circuit 31 to a desired power level, and changing the frequency of the combined signal And a high-frequency circuit 32 for converting the IF frequency to the RF frequency, and the ⁇ modulation circuits 12 and 13 have different circuit configurations.
  • the high frequency unit 3 combines the digital modulation signals output from the ⁇ modulation circuits 12 and 13 and then sets the power level and frequency of the signal power of the combined signal of the two digital modulation signals. Since conversion is performed, the number of high-frequency circuits can be reduced to one, and the circuit configuration can be simplified.
  • the modulation signal output circuit unit 1 includes two ⁇ modulation circuits 12 and 13 having different circuit configurations.
  • the modulation signal output circuit unit 1 has a different circuit configuration.
  • N number of ⁇ modulation circuits may be mounted, and the combining circuit 31 of the high-frequency unit 2 may combine the delta-sigma modulated digital modulation signals output from the N ⁇ modulation circuits.
  • Embodiment 3 the synthesis circuit 23 synthesizes the converted digital modulation signal output from the high-frequency circuit 21 and the converted digital modulation signal output from the high-frequency circuit 22 to produce two digital modulations.
  • the output of the composite signal of the signal is shown, the digital modulation signal radiated from the plurality of antennas is provided with a plurality of antennas that radiate the converted digital modulation signals output from the high-frequency circuits 21 and 22 to the space. You may make it synthesize
  • the high frequency section 4 is a circuit composed of high frequency circuits 21 and 22 and antennas 41 and 42.
  • the antenna 41 is connected to the signal output terminal of the high-frequency circuit 21 and radiates the converted digital modulation signal output from the high-frequency circuit 21 to the space.
  • the antenna 42 is connected to the signal output terminal of the high-frequency circuit 22 and radiates the converted digital modulation signal output from the high-frequency circuit 22 into space.
  • the high-frequency unit 4 When receiving the digital modulation signal after the delta-sigma modulation from the ⁇ modulation circuit 12, the high frequency circuit 21 converts the signal power of the digital modulation signal to a desired power level as well as the digital modulation signal, as in the first embodiment. The frequency of the modulation signal is converted from the IF frequency to the RF frequency, and the converted digital modulation signal is output. When receiving the digital modulation signal after the delta sigma modulation from the ⁇ modulation circuit 13, the high frequency circuit 22 converts the signal power of the digital modulation signal to a desired power level as well as the digital modulation signal, as in the first embodiment.
  • the frequency of the modulation signal is converted from the IF frequency to the RF frequency, and the converted digital modulation signal is output.
  • the converted digital modulation signal output from the high-frequency circuit 21 and the converted digital modulation signal output from the high-frequency circuit 22 have the same signal power and the same frequency.
  • the ⁇ noise component is incoherent, but the desired signal component of the digital modulation signal is coherent.
  • the antenna 41 When receiving the converted digital modulation signal from the high-frequency circuit 21, the antenna 41 radiates the digital modulation signal to space.
  • the antenna 42 receives the converted digital modulation signal from the high frequency circuit 22, the antenna 42 radiates the digital modulation signal to space.
  • the digital modulation signal radiated from the antenna 41 and the digital modulation signal radiated from the antenna 42 are combined in space.
  • the two desired signal components of the two digital modulation signals output from the high-frequency circuits 21 and 22 are coherent, the two desired signal components are voltage-added by synthesis in space.
  • the ⁇ noise components of the two digital modulation signals are incoherent, the ⁇ noise components of the two digital modulation signals are summed by combining in space.
  • the SNR which is the power ratio between the desired signal component and the ⁇ noise component in the signal synthesized in space, is the difference between the desired signal component and the ⁇ noise component in the digital modulation signal output from each of the high frequency circuits 21 and 22.
  • the theoretical improvement is 3 dB. Therefore, a receiver that is a communication target with the digital transmitter can receive a signal having a high SNR.
  • the modem 11 that modulates communication data to generate a digital modulation signal, and the digital modulation signal generated by the modem 11 are delta-sigma modulated to produce a delta-sigma ⁇ modulation circuits 12 and 13 that output the modulated digital modulation signal, and the signal power of the digital modulation signal output from the ⁇ modulation circuits 12 and 13 is converted to a desired power level, and the frequency of the digital modulation signal is changed.
  • the synthesis circuit 23 is not necessary.
  • Embodiment 4 FIG.
  • the modulation signal output circuit unit 1 is mounted with the ⁇ modulation circuits 12 and 13 having different circuit configurations.
  • the circuit configuration of the ⁇ modulation circuits 12 and 13 is provided. Therefore, the load of circuit development increases.
  • the fourth embodiment therefore, a case where a plurality of ⁇ modulation circuits having the same circuit configuration are mounted in the modulation signal output circuit section and different operating conditions are set for the plurality of ⁇ modulation circuits will be described.
  • the modulation signal output circuit unit 5 is a digital circuit including a modem 11, ⁇ modulation circuits 51 and 52, and a setting circuit 53.
  • the ⁇ modulation circuit 51 has a signal input terminal connected to the signal output terminal of the modem 11, and delta-sigma modulates the digital modulation signal output from the modem 11 and outputs a digital modulation signal after delta-sigma modulation. It is.
  • the ⁇ modulation circuit 52 is a circuit having the same circuit configuration as the ⁇ modulation circuit 51.
  • the ⁇ modulation circuit 52 has a signal input terminal connected to the signal output terminal of the modem 11, delta-sigma-modulates the digital modulation signal output from the modem 11, and outputs a digital modulation signal after delta-sigma modulation.
  • the setting circuit 53 is a circuit for setting different operating conditions for the ⁇ modulation circuits 51 and 52.
  • FIG. 5 is a block diagram showing ⁇ modulation circuits 51 and 52 of a digital transmitter according to Embodiment 4 of the present invention.
  • an initial value circuit 61 is a circuit that outputs an initial value of a digital modulation signal corresponding to the operating condition set by the setting circuit 53.
  • the setting circuit 53 sets different operating conditions for the ⁇ modulation circuits 51 and 52, the initial value output from the initial value circuit 61 of the ⁇ modulation circuit 51 and the initial value circuit 61 of the ⁇ modulation circuit 52 are It becomes a value different from the initial value to be output.
  • the PN signal generation circuit 62 is a circuit that generates a PN signal (pseudo noise signal) corresponding to the operating condition set by the setting circuit 53 and outputs the PN signal.
  • the setting circuit 53 sets different operating conditions for the ⁇ modulation circuits 51 and 52
  • the PN signal output from the PN signal generation circuit 62 of the ⁇ modulation circuit 51 and the PN signal generation circuit of the ⁇ modulation circuit 52 are set. The signal is different from the PN signal output by 62.
  • the adder 63 has a first signal input terminal connected to the signal output terminal of the modem 11, a second signal input terminal connected to the signal output terminal of the initial value circuit 61, and a third signal input terminal generating a PN signal.
  • the digital modulation signal output from the modem 11 is output from the initial value circuit 61.
  • the initial value and the pseudo noise signal output from the PN signal generation circuit 62 are added, and a digital modulation signal obtained by adding the initial value and the pseudo noise signal is output to the ⁇ modulator 64.
  • the digital noise signal output from the PN signal generation circuit 62 is added to the digital modulation signal output from the modem 11 to add the pseudo noise signal.
  • the modulation signal is output to the ⁇ modulator 64.
  • the signal input terminal of the ⁇ modulator 64 is connected to the signal output terminal of the adder 63, and the digital modulation signal output from the adder 63 is delta-sigma-modulated to output a digital modulation signal after delta-sigma modulation. It is a digital circuit.
  • the setting circuit 53 sets different operating conditions for the ⁇ modulation circuits 51 and 52.
  • the initial value circuit 61 of the ⁇ modulation circuits 51 and 52 outputs an initial value of a digital modulation signal corresponding to the operating condition to the adder 63. Since different operating conditions are set for the modulation circuits 51 and 52, the initial value output from the initial value circuit 61 of the ⁇ modulation circuit 51 is different from the initial value output from the initial value circuit 61 of the ⁇ modulation circuit 52. become.
  • any initial value may be used as long as the initial value is different, and it may be appropriately determined at the time of design.
  • the PN signal generating circuit 62 of the ⁇ modulation circuits 51 and 52 When the setting circuit 53 sets an operating condition, the PN signal generating circuit 62 of the ⁇ modulation circuits 51 and 52 generates a PN signal corresponding to the operating condition and outputs the PN signal to the adder 63. Since the circuit 53 sets different operating conditions for the ⁇ modulation circuits 51 and 52, the PN signal output from the PN signal generation circuit 62 of the ⁇ modulation circuit 51 and the PN signal generation circuit 62 of the ⁇ modulation circuit 52 output. The PN signal is different from the PN signal. In the fourth embodiment, any PN signal may be used as long as the PN signals are different, and may be appropriately determined at the time of design.
  • the adder 63 of the ⁇ modulation circuits 51 and 52 outputs the digital modulation signal output from the modem 11 from the initial value circuit 61 when the first clock of the clock group indicating the operation timing is input.
  • the initial value and the pseudo noise signal output from the PN signal generation circuit 62 are added, and a digital modulation signal obtained by adding the initial value and the pseudo noise signal is output to the ⁇ modulator 64.
  • the adder 63 of the ⁇ modulation circuits 51 and 52 receives the pseudo noise signal output from the PN signal generation circuit 62 in response to the digital modulation signal output from the modem 11. And the digital modulation signal added with the pseudo noise signal is output to the ⁇ modulator 64.
  • the ⁇ modulator 64 of the ⁇ modulation circuits 51 and 52 When receiving the digital modulation signal from the adder 63, the ⁇ modulator 64 of the ⁇ modulation circuits 51 and 52 performs delta sigma modulation on the digital modulation signal and outputs the digital modulation signal after the delta sigma modulation to the high frequency circuits 21 and 22. To do. Even if the circuit configurations of the ⁇ modulation circuits 51 and 52 are the same, if the initial value and the PN signal are different, the characteristic of ⁇ noise generated when delta-sigma modulation of the digital modulation signal output from the modem 11 is incoherent. become.
  • the desired signal component becomes coherent if the same digital modulation signal output from the modem 11 is subjected to delta sigma modulation.
  • the fourth embodiment an example is shown in which both the initial value and the PN signal are different.
  • the ⁇ noise characteristic is made incoherent and desired.
  • the signal component can be made coherent. Therefore, if the initial value output from the initial value circuit 61 of the ⁇ modulation circuit 51 and the initial value output from the initial value circuit 61 of the ⁇ modulation circuit 52 are different, the PN signal generation circuit of the ⁇ modulation circuits 51 and 52
  • the PN signals output from 62 may be the same.
  • the initial values of the ⁇ modulation circuits 51 and 52 are set.
  • the initial value output from the circuit 61 may be the same.
  • the modulation signal output circuit unit 5 is mounted with the ⁇ modulation circuits 51 and 52 having the same circuit configuration and is different from the ⁇ modulation circuits 51 and 52. Since the setting circuit 53 for setting the operating conditions is mounted, as in the first embodiment, the ⁇ noise associated with the delta-sigma modulation of the digital modulation signal can be reduced and the SNR can be increased. Compared with the case where the ⁇ modulation circuits 12 and 13 having different circuit configurations are mounted, the load required for the circuit development of the ⁇ modulation circuits 51 and 52 can be reduced.
  • Embodiment 5 the single-stage ⁇ modulation circuit in which the number of ⁇ modulators 64 included in the ⁇ modulation circuits 51 and 52 having the same circuit configuration is one is shown. However, the circuit configuration is the same.
  • the delta-sigma modulation circuits 51 and 52 may include a plurality of delta-sigma modulators having a plurality of delta-sigma modulators.
  • FIG. 6 is a block diagram showing ⁇ modulation circuits 51 and 52 of a digital transmitter according to Embodiment 5 of the present invention.
  • an initial value circuit 71 is a circuit that outputs a first initial value and a second initial value of a digital modulation signal corresponding to the operating condition set by the setting circuit 53.
  • the setting circuit 53 sets different operating conditions for the ⁇ modulation circuits 51 and 52
  • the first initial value output from the initial value circuit 71 of the ⁇ modulation circuit 51 and the initial value of the ⁇ modulation circuit 52 are set. It becomes a value different from the first initial value output from the circuit 71.
  • the second initial value output from the initial value circuit 71 of the ⁇ modulation circuit 51 is different from the second initial value output from the initial value circuit 71 of the ⁇ modulation circuit 52.
  • the PN signal generation circuit 72 generates a first PN signal and a second PN signal corresponding to the operating condition set by the setting circuit 53, and outputs the first PN signal and the second PN signal. It is. However, since the setting circuit 53 sets different operating conditions for the ⁇ modulation circuits 51 and 52, the first PN signal output from the PN signal generation circuit 72 of the ⁇ modulation circuit 51 and the PN of the ⁇ modulation circuit 52 are set. The signal is different from the first PN signal output from the signal generation circuit 72. Further, the second PN signal output from the PN signal generation circuit 72 of the ⁇ modulation circuit 51 is different from the second PN signal output from the PN signal generation circuit 72 of the ⁇ modulation circuit 52.
  • the offset generation circuit 73 is a circuit that generates an offset signal corresponding to the operating condition set by the setting circuit 53. However, since the setting circuit 53 sets different operating conditions for the ⁇ modulation circuits 51 and 52, the offset signal output from the offset generation circuit 73 of the ⁇ modulation circuit 51 and the offset generation circuit 73 of the ⁇ modulation circuit 52 It becomes a signal different from the offset signal to be output.
  • the adder 74 has a first signal input terminal connected to the signal output terminal of the modem 11, a second signal input terminal connected to the first signal output terminal of the initial value circuit 71, and a third signal input terminal
  • the digital modulation signal output from the modem 11 is A digital value obtained by adding the first initial value output from the initial value circuit 71 and the first PN signal output from the PN signal generation circuit 72 and adding the first initial value and the first PN signal.
  • the modulation signal is output to the ⁇ modulator 75.
  • the first PN signal output from the PN signal generation circuit 72 is added to the digital modulation signal output from the modem 11 to obtain the first PN signal.
  • a first adder that outputs a digital modulation signal obtained by adding to the ⁇ modulator 75.
  • the ⁇ modulator 75 has a signal input terminal connected to the signal output terminal of the adder 74, delta-sigma modulates the digital modulation signal output from the adder 74, and outputs a digital modulation signal after delta-sigma modulation. This is the first ⁇ modulator.
  • the adder 76 has a first signal input terminal connected to the signal output terminal of the ⁇ modulator 75, a second signal input terminal connected to the second signal output terminal of the initial value circuit 71, and a third signal input.
  • the terminal is connected to the second signal output terminal of the PN signal generation circuit 72, the fourth signal input terminal is connected to the offset generation circuit 73, and the first clock in the clock group indicating the operation timing is input.
  • the second PN signal output from the PN signal generation circuit 72 and the offset generation circuit 73 are output with respect to the digital modulation signal output from the ⁇ modulator 75.
  • the second adder outputs the digital modulation signal obtained by adding the offset signal and the second PN signal and the offset signal to the ⁇ modulator 77.
  • the ⁇ modulator 77 has a signal input terminal connected to the signal output terminal of the adder 76, and delta-sigma-modulates the digital modulation signal output from the adder 76 and outputs a digital modulation signal after delta-sigma modulation.
  • the adder 78 has a first signal input terminal connected to the ⁇ modulator 75 and a second signal input terminal connected to the ⁇ modulator 77, and the digital modulation signal output from the ⁇ modulator 75 and the ⁇ modulation.
  • the setting circuit 53 sets different operating conditions for the ⁇ modulation circuits 51 and 52.
  • the initial value circuit 71 of the ⁇ modulation circuits 51 and 52 adds the first initial value and the second initial value of the digital modulation signal corresponding to the operating condition to the adder 74 and
  • the first initial value output from the initial value circuit 71 of the ⁇ modulation circuit 51, and the ⁇ modulation circuit This is a value different from the first initial value output by the initial value circuit 71 of 52.
  • the second initial value output from the initial value circuit 71 of the ⁇ modulation circuit 51 is different from the second initial value output from the initial value circuit 71 of the ⁇ modulation circuit 52.
  • any initial value may be used as long as the initial value is different, and it may be appropriately determined at the time of design.
  • the PN signal generating circuit 72 of the ⁇ modulation circuits 51 and 52 When the setting circuit 53 sets an operating condition, the PN signal generating circuit 72 of the ⁇ modulation circuits 51 and 52 generates a first PN signal and a second PN signal corresponding to the operating condition, and the first PN signal is generated. The PN signal and the second PN signal are output to the adders 74 and 76, respectively. Since the setting circuit 53 sets different operating conditions for the ⁇ modulation circuits 51 and 52, the PN signal generation of the ⁇ modulation circuit 51 is performed. The first PN signal output from the circuit 72 is different from the first PN signal output from the PN signal generation circuit 72 of the ⁇ modulation circuit 52.
  • the second PN signal output from the PN signal generation circuit 72 of the ⁇ modulation circuit 51 is different from the second PN signal output from the PN signal generation circuit 72 of the ⁇ modulation circuit 52.
  • any PN signal may be used as long as the PN signals are different, and may be appropriately determined at the time of design.
  • the offset generating circuit 73 of the ⁇ modulation circuits 51 and 52 generates an offset signal corresponding to the operating condition and outputs the offset signal to the adder 76.
  • any offset signal may be used as long as the offset signals are different, and may be determined as appropriate at the time of design.
  • the adder 74 of the ⁇ modulation circuits 51 and 52 outputs the digital modulation signal output from the modem 11 from the initial value circuit 71 when the first clock of the clock group indicating the operation timing is input.
  • the first modulated initial value and the first PN signal output from the PN signal generation circuit 72 are added, and a digital modulation signal obtained by adding the first initial value and the first PN signal is added to the ⁇ modulator. Output to 75.
  • the adder 74 of the ⁇ modulation circuits 51 and 52 receives the first modulation signal output from the PN signal generation circuit 72 in response to the digital modulation signal output from the modem 11.
  • the digital modulation signal obtained by adding the PN signals and adding the first PN signal is output to the ⁇ modulator 75.
  • the ⁇ modulator 75 of the ⁇ modulation circuits 51 and 52 When receiving the digital modulation signal from the adder 74, the ⁇ modulator 75 of the ⁇ modulation circuits 51 and 52 performs delta sigma modulation on the digital modulation signal and outputs the digital modulation signal after the delta sigma modulation to the adders 76 and 78. To do.
  • the adder 76 of the ⁇ modulation circuits 51 and 52 receives an initial value circuit 71 for the digital modulation signal output from the ⁇ modulator 75 when the first clock of the clock group indicating the operation timing is input. , The second PN signal output from the PN signal generation circuit 72, and the offset signal output from the offset generation circuit 73 are added together to obtain a second initial value, A digital modulation signal obtained by adding the second PN signal and the offset signal is output to the ⁇ modulator 77. Further, when the second and subsequent clocks are input to the adder 76 of the ⁇ modulation circuits 51 and 52, the digital modulation signal output from the ⁇ modulator 75 is output from the PN signal generation circuit 72. The second PN signal and the offset signal output from the offset generation circuit 73 are added, and a digital modulation signal obtained by adding the second PN signal and the offset signal is output to the ⁇ modulator 77.
  • the ⁇ modulator 77 of the ⁇ modulation circuits 51 and 52 Upon receiving the digital modulation signal from the adder 76, the ⁇ modulator 77 of the ⁇ modulation circuits 51 and 52 performs delta sigma modulation on the digital modulation signal and outputs the digital modulation signal after the delta sigma modulation to the adder 78.
  • the adder 78 of the ⁇ modulation circuits 51 and 52 adds the digital modulation signal output from the ⁇ modulator 75 and the digital modulation signal output from the ⁇ modulator 77, and adds the added digital modulation signal to the high frequency circuit 21. , 22.
  • the first initial value, the first PN signal, the second initial value, the second PN signal, and the offset signal are all different from each other. If at least one of the first PN signal, the second initial value, the second PN signal, and the offset signal is different, the ⁇ noise characteristic is made incoherent, and the desired signal component is Can be coherent.
  • the modulation signal output circuit unit 5 is mounted with the ⁇ modulation circuits 51 and 52 having the same circuit configuration and is different from the ⁇ modulation circuits 51 and 52. Since the setting circuit 53 for setting the operating conditions is mounted, as in the first embodiment, the ⁇ noise associated with the delta-sigma modulation of the digital modulation signal can be reduced and the SNR can be increased. Compared with the case where the ⁇ modulation circuits 12 and 13 having different circuit configurations are mounted, the load required for the circuit development of the ⁇ modulation circuits 51 and 52 can be reduced.
  • the example in which the ⁇ modulators 75 and 77 having the same circuit configuration in the ⁇ modulation circuits 51 and 52 have a two-stage configuration is shown.
  • the ⁇ modulation circuits 51 and 52 are included in the internal circuit.
  • the delta-sigma modulator may have three or more stages.
  • the modulation signal output circuit unit 1 mounts one modem 11, and the modem 11 transmits the same digital modulation signal to the ⁇ modulation circuits 12, 13 (Alternatively, what is output to the ⁇ modulation circuits 51 and 52), the modulation signal output circuit unit has a plurality of modems that generate the same digital modulation signal, and a plurality of modems and a plurality of ⁇ modulations.
  • the circuits may be connected one to one.
  • the modulation signal output circuit unit 6 includes modems 11a and 11b, ⁇ modulation circuits 51 and 52, and a setting circuit 53.
  • the modem 11 a modulates communication data to generate a digital modulation signal, and outputs the digital modulation signal to the ⁇ modulation circuit 51.
  • the modem 11b modulates the communication data to generate a digital modulation signal that is the same as the digital modulation signal generated by the modem 11a, and outputs the digital modulation signal to the ⁇ modulation circuit 52.
  • FIG. 7 shows an example in which two modems are mounted, N modems and N ⁇ modulation circuits may be mounted.
  • the timing output from the ⁇ modulation circuit 51 to the high frequency circuit 21 and the ⁇ modulation circuit 52 If the output timing of the digital modulation signal from the modems 11a and 11b is controlled so that the timing output from the radio frequency circuit 22 to the high frequency circuit 22 is shifted, the radiation direction of the digital modulation signal radiated from the antennas 41 and 42 of the high frequency unit 4 is controlled. Can be controlled in any direction.
  • the modulation signal output circuit unit 6 mounts the two modems 11a and 11b, and outputs from the ⁇ modulation circuit 51 to the high frequency circuit 21 and from the ⁇ modulation circuit 52 to the high frequency circuit 22.
  • the output timing of the digital modulation signal from the modems 11a and 11b is controlled so that the timing is different from that of the modem 11a and 11b.
  • one modem 11 and the ⁇ modulation circuits 12 and 13 (or ⁇ modulation circuits 51 and 52).
  • a delay circuit may be inserted between the delay circuits to control the amount of delay of the digital modulation signal by the plurality of delay circuits.
  • the digital modulation signal radiated from the antennas 41 and 42 of the high-frequency unit 4 may be controlled.
  • the radiation direction can be controlled in an arbitrary direction.
  • FIG. 8 is a block diagram showing a modulation signal output circuit unit 7 of a digital transmitter according to Embodiment 7 of the present invention.
  • the modulation signal output circuit unit 7 includes a modem 11, ⁇ modulation circuits 51 and 52, a setting circuit 53, delay circuits 81 and 82, and a delay control circuit 83.
  • Delay circuits 81 and 82 are inserted between modem 11 and ⁇ modulation circuits 51 and 52, delay the digital modulation signal generated by modem 11, and output the delayed digital modulation signal to ⁇ modulation circuits 51 and 52. It is a circuit to do.
  • the delay control circuit 83 is a circuit that controls the delay amount of the digital modulation signal by the delay circuits 81 and 82.
  • the timing output from the ⁇ modulation circuit 51 to the high frequency circuit 21 and the ⁇ modulation circuit 52 If the delay control circuit 83 controls the amount of delay in the delay circuits 81 and 82 so that the timing output from the signal to the high-frequency circuit 22 is shifted, the digital modulation signal radiated from the antennas 41 and 42 of the high-frequency unit 4
  • the radiation direction can be controlled in an arbitrary direction.
  • Embodiment 8 FIG.
  • the modulation signal output circuit units 1, 5, 6 and 7 mount the ⁇ modulation circuits 12 and 13 (or ⁇ modulation circuits 51 and 52), and the ⁇ modulation circuits 12 and 13 (or The ⁇ modulation circuit 51 (or the ⁇ modulation circuit 51) and the ⁇ modulation circuit are used to reduce the ⁇ noise generated when the ⁇ modulation circuits 51, 52) perform delta-sigma modulation on the digital modulation signal and increase the SNR. 13 (or ⁇ modulation circuit 52) is different in circuit configuration or operating condition.
  • a pulse-width modulation circuit that performs pulse-width modulation on a digital modulation signal and outputs a PWM signal that is a digital modulation signal after pulse-width modulation is also mounted near the desired modulation signal band. Since noise is generated, the SNR that is the power ratio between the desired signal component and the noise component may deteriorate.
  • a digital transmitter capable of reducing the noise accompanying pulse width modulation of a digital modulation signal and increasing the SNR will be described.
  • FIG. 9 is a block diagram showing a digital transmitter according to Embodiment 8 of the present invention.
  • the modulation signal output circuit unit 91 includes a modem 11 and pulse width modulation circuits 101 and 102, and is a digital circuit that modulates communication data to generate a digital modulation signal and performs pulse width modulation on the digital modulation signal.
  • the pulse width modulation circuit 101 has a signal input terminal connected to a signal output terminal of the modem 11.
  • the pulse width modulation circuit 101 performs pulse width modulation on the digital modulation signal output from the modem 11, and a PWM signal which is a digital modulation signal after pulse width modulation. Is a digital circuit that outputs.
  • the pulse width modulation circuit 102 has a signal input terminal connected to the signal output terminal of the modem 11 and is different in circuit configuration from the pulse width modulation circuit 101, but is output from the modem 11 in the same manner as the pulse width modulation circuit 101.
  • the digital modulation signal is subjected to pulse width modulation, and a PWM signal which is a digital modulation signal after pulse width modulation is output.
  • the modem 11 of the modulation signal output circuit unit 91 receives communication data composed of various information from the outside, the modem 11 modulates the communication data to generate a digital modulation signal, and the digital modulation signal is converted into a pulse width modulation circuit. 101 and 102.
  • the pulse width modulation circuit 101 When the pulse width modulation circuit 101 receives the digital modulation signal from the modem 11, the pulse width modulation circuit 101 performs pulse width modulation on the digital modulation signal and outputs a PWM signal, which is a digital modulation signal after pulse width modulation, to the high frequency circuit 21.
  • the pulse width modulation circuit 102 receives the digital modulation signal from the modem 11, the pulse width modulation circuit 102 performs pulse width modulation on the digital modulation signal and outputs a PWM signal which is a digital modulation signal after pulse width modulation to the high frequency circuit 22.
  • the pulse width modulation by the pulse width modulation circuits 101 and 102 As the amplitude value of the digital modulation signal output from the modem 11 is larger, a pulse having a wider pulse width is generated and a PWM signal composed of a plurality of pulse sequences is output.
  • the characteristics of noise generated when the pulse width modulation circuits 101 and 102 perform pulse width modulation depend on the circuit configuration of the pulse width modulation circuits 101 and 102. This is the same as the characteristic of the ⁇ noise depending on the circuit configuration of the ⁇ modulation circuits 12 and 13.
  • the pulse width modulation circuit 101 and the pulse width modulation circuit 102 have different circuit configurations, and the pulse width modulation circuit 101 and the pulse width modulation circuit 102 have different circuit configurations.
  • the processing sequence of pulse width modulation is different, noise characteristics are different.
  • the noise component generated from the pulse width modulation circuit 101 and the noise component generated from the pulse width modulation circuit 102 are incoherent.
  • the pulse width modulation circuits 101 and 102 perform pulse width modulation on the same digital modulation signal output from the modem 11, a desired signal component of the digital modulation signal output from the pulse width modulation circuit 101, and The desired signal component of the digital modulation signal output from the pulse width modulation circuit 102 is coherent.
  • any circuit configuration may be used as long as the pulse width modulation circuit 101 and the pulse width modulation circuit 102 have different circuit configurations. Description of the detailed configuration is omitted. Various known configurations are known as the circuit configuration of the pulse width modulation circuit.
  • the high frequency circuit 21 When the high frequency circuit 21 receives the digital modulation signal after pulse width modulation from the pulse width modulation circuit 101, the high frequency circuit 21 converts the signal power of the digital modulation signal into a desired power level, and converts the frequency of the digital modulation signal from the IF frequency. The signal is converted into an RF frequency, and the converted digital modulation signal is output to the synthesis circuit 23.
  • the high frequency circuit 22 receives the digital modulation signal after the pulse width modulation from the pulse width modulation circuit 102, the high frequency circuit 22 converts the signal power of the digital modulation signal into a desired power level and converts the frequency of the digital modulation signal from the IF frequency. The signal is converted into an RF frequency, and the converted digital modulation signal is output to the synthesis circuit 23.
  • the converted digital modulation signal output from the high-frequency circuit 21 and the converted digital modulation signal output from the high-frequency circuit 22 have the same signal power and the same frequency.
  • the converted digital modulation signals output from the high-frequency circuits 21 and 22 also have a noise component incoherent, but a desired signal component of the digital modulation signal is coherent.
  • the synthesis circuit 23 synthesizes the converted digital modulation signal output from the high-frequency circuit 21 and the converted digital modulation signal output from the high-frequency circuit 22 to generate two signals. A composite signal of the digital modulation signal is output. At this time, since the desired signal components of the two digital modulation signals are coherent, the two desired signal components are voltage-added by the synthesis of the synthesis circuit 23. On the other hand, since the noise components of the two digital modulation signals are incoherent, the noise components of the two digital modulation signals are summed by the synthesis of the synthesis circuit 23.
  • the SNR which is the power ratio between the desired signal component and the noise component in the combined signal output from the combining circuit 23, is the desired signal component and the noise component in the digital modulation signals output from the high frequency circuits 21 and 22, respectively.
  • the theoretical improvement is 3 dB.
  • the modem 11 that modulates communication data to generate a digital modulation signal, and the pulse width modulation of the digital modulation signal generated by the modem 11
  • the pulse width modulation circuits 101 and 102 for outputting the modulated digital modulation signal, the signal power of the digital modulation signal output from the pulse width modulation circuits 101 and 102 are converted to a desired power level, and the digital modulation signal
  • the high frequency circuits 21 and 22 for converting the frequency from the IF frequency to the RF frequency, the digital modulation signal after the conversion by the high frequency circuit 21 and the digital modulation signal after the conversion by the high frequency circuit 22 are combined to generate two digital modulation signals.
  • a synthesis circuit 23 for outputting a synthesis signal and the circuit configuration of the pulse width modulation circuits 101 and 102. Since it configured to be different, to reduce the noise associated with the pulse width modulation of the digital modulation signal, an effect that can increase the SNR.
  • the modulation signal output circuit unit 91 is mounted with two pulse width modulation circuits 101 and 102 having different circuit configurations.
  • the modulation signal output circuit unit 91 has a circuit configuration.
  • the high-frequency unit 2 mounts N high-frequency circuits, and the synthesis circuit 23 synthesizes the converted digital modulation signals output from the N high-frequency circuits. You may do it.
  • the high frequency unit 2 converts the signal power of the digital modulation signal output from the pulse width modulation circuits 101 and 102 to a desired power level, and converts the frequency of the digital modulation signal from the IF frequency to the RF frequency.
  • the two digital modulation signals after the conversion are synthesized after being converted to the frequency.
  • the signal power of the combined signal may be converted to a desired power level, and the frequency of the combined signal may be converted from the IF frequency to the RF frequency.
  • FIG. 10 is a block diagram showing a digital transmitter according to Embodiment 9 of the present invention.
  • the combining circuit 31 combines the digital modulated signal after pulse width modulation output from the pulse width modulating circuit 101 and the digital modulated signal after pulse width modulation output from the pulse width modulating circuit 102 to generate two digital signals. A composite signal of the modulation signal is output. At this time, since the desired signal components of the two digital modulation signals are coherent, the two desired signal components are voltage-added by the synthesis of the synthesis circuit 31. On the other hand, since the noise components of the two digital modulation signals are incoherent, the noise components of the two digital modulation signals are summed by the synthesis of the synthesis circuit 31.
  • the SNR that is the power ratio between the desired signal component and the noise component in the combined signal output from the combining circuit 31 is the desired signal component and noise in the digital modulation signal output from each of the pulse width modulation circuits 101 and 102.
  • the SNR with the component there is a theoretical 3 dB improvement.
  • the high frequency circuit 32 When the high frequency circuit 32 receives the combined signal from the combining circuit 31, the high frequency circuit 32 converts the signal power of the combined signal into a desired power level and converts the frequency of the combined signal from the IF frequency to the RF frequency.
  • the modem 11 that modulates communication data to generate a digital modulation signal
  • Pulse width modulation circuits 101 and 102 that output a modulated digital modulation signal, a pulse width modulated digital modulation signal output from the pulse width modulation circuit 101, and a pulse width modulated output from the pulse width modulation circuit 102 are combined with each other, and a combined circuit 31 for outputting a combined signal of the two digital modulated signals is converted into a desired power level, and the combined signal output from the combined circuit 31 is converted into a desired power level.
  • a high-frequency circuit 32 for converting the frequency of IF from the IF frequency to the RF frequency, and the circuit of the pulse width modulation circuits 101 and 102 Since it is configured such that are different, by reducing the noise associated with the pulse width modulation of the digital modulation signal, an effect that can increase the SNR.
  • the high frequency unit 3 combines the digital modulation signals output from the pulse width modulation circuits 101 and 102, and then the power level and frequency of the signal power of the combined signal of the two digital modulation signals.
  • the number of high-frequency circuits can be reduced to one, and the circuit configuration can be simplified.
  • the modulation signal output circuit unit 91 is mounted with two pulse width modulation circuits 101 and 102 having different circuit configurations.
  • the modulation signal output circuit unit 91 has a circuit configuration. Different N pulse width modulation circuits may be mounted, and the synthesis circuit 31 of the high-frequency unit 2 may synthesize the pulse-modulated digital modulation signal output from the N pulse width modulation circuits.
  • the synthesis circuit 23 synthesizes the converted digital modulation signal output from the high frequency circuit 21 and the converted digital modulation signal output from the high frequency circuit 22 to generate two digital modulations.
  • the output of the combined signal is shown, antennas 41 and 42 that radiate the converted digital modulation signals output from the high-frequency circuits 21 and 22 to the space are provided, and the digital modulation radiated from the antennas 41 and 42 is provided.
  • the signals may be combined in space.
  • FIG. 11 is a block diagram showing a digital transmitter according to Embodiment 10 of the present invention.
  • the high frequency circuit 21 receives the digital modulation signal after the pulse width modulation from the pulse width modulation circuit 101, the high frequency circuit 21 converts the signal power of the digital modulation signal to a desired power level as in the eighth embodiment, and The frequency of the digital modulation signal is converted from the IF frequency to the RF frequency.
  • the high frequency circuit 22 When the high frequency circuit 22 receives the digital modulation signal after the pulse width modulation from the pulse width modulation circuit 102, the high frequency circuit 22 converts the signal power of the digital modulation signal to a desired power level as in the eighth embodiment, and The frequency of the digital modulation signal is converted from the IF frequency to the RF frequency.
  • the converted digital modulation signal output from the high-frequency circuit 21 and the converted digital modulation signal output from the high-frequency circuit 22 have the same signal power and the same frequency.
  • the converted digital modulation signals output from the high-frequency circuits 21 and 22 also have a noise component incoherent, but a desired signal component of the digital modulation signal is coherent.
  • the antenna 41 When receiving the converted digital modulation signal from the high-frequency circuit 21, the antenna 41 radiates the digital modulation signal to space.
  • the antenna 42 receives the converted digital modulation signal from the high frequency circuit 22, the antenna 42 radiates the digital modulation signal to space.
  • the digital modulation signal radiated from the antenna 41 and the digital modulation signal radiated from the antenna 42 are combined in space.
  • the two desired signal components of the two digital modulation signals output from the high-frequency circuits 21 and 22 are coherent, the two desired signal components are voltage-added by synthesis in space.
  • the noise components of the two digital modulation signals are incoherent, the noise components of the two digital modulation signals become power addition by combining in space.
  • the SNR which is the power ratio between the desired signal component and the noise component in the signal synthesized in space, is the SNR of the desired signal component and the noise component in the digital modulation signal output from each of the high frequency circuits 21 and 22.
  • 3 dB is obtained. Therefore, a receiver that is a communication target with the digital transmitter can receive a signal having a high SNR.
  • the modem 11 that modulates communication data to generate a digital modulation signal, and the pulse width modulation of the digital modulation signal generated by the modem 11
  • the pulse width modulation circuits 101 and 102 for outputting the modulated digital modulation signal, the signal power of the digital modulation signal output from the pulse width modulation circuits 101 and 102 are converted to a desired power level, and the digital modulation signal High-frequency circuits 21 and 22 for converting the frequency from IF frequency to RF frequency, and antennas 41 and 42 for radiating the converted digital modulation signals output from the high-frequency circuits 21 and 22 to the space, and a pulse width modulation circuit 101 , 102 are configured so as to have different circuit configurations, so that pulse width modulation of a digital modulation signal can be performed.
  • the synthesis circuit 23 is not necessary.
  • Embodiment 11 FIG.
  • the modulation signal output circuit unit 91 is mounted with the pulse width modulation circuits 101 and 102 having different circuit configurations. Since it is necessary to design each circuit configuration, the load of circuit development increases. Therefore, in the eleventh embodiment, a description will be given of a case where a plurality of pulse width modulation circuits having the same circuit configuration are mounted in the modulation signal output circuit section and different operating conditions are set for the plurality of pulse width modulation circuits.
  • FIG. 12 is a block diagram showing a digital transmitter according to Embodiment 11 of the present invention.
  • the modulation signal output circuit unit 92 is a digital circuit including the modem 11, pulse width modulation circuits 111 and 112, and a setting circuit 113.
  • the pulse width modulation circuit 111 has a signal input terminal connected to the signal output terminal of the modem 11.
  • the pulse width modulation circuit 111 performs pulse width modulation on the digital modulation signal output from the modem 11 and outputs a digital modulation signal after pulse width modulation.
  • the pulse width modulation circuit 112 is a circuit having the same circuit configuration as the pulse width modulation circuit 111.
  • the pulse width modulation circuit 112 has a signal input terminal connected to the signal output terminal of the modem 11.
  • the pulse width modulation circuit 112 performs pulse width modulation on the digital modulation signal output from the modem 11 and outputs a digital modulation signal after pulse width modulation.
  • the setting circuit 113 is a circuit that sets different operating conditions for the pulse width modulation circuits 111 and 112.
  • the setting circuit 113 sets different operating conditions for the pulse width modulation circuits 111 and 112.
  • the pulse width modulation circuit 111 When the pulse width modulation circuit 111 receives the digital modulation signal from the modem 11, the pulse width modulation circuit 111 performs pulse width modulation on the digital modulation signal in accordance with the operation condition set by the setting circuit 113, and converts the digital modulation signal after the pulse width modulation into a high frequency circuit. To 21.
  • the pulse width modulation circuit 112 receives the digital modulation signal from the modem 11, the pulse width modulation circuit 112 performs pulse width modulation on the digital modulation signal in accordance with the operation condition set by the setting circuit 113, and converts the digital modulation signal after the pulse width modulation into a high frequency circuit 22 to output.
  • the pulse width modulation circuit is similar to the pulse width modulation circuits 101 and 102 of FIG.
  • the noise component generated from 111 and the noise component generated from the pulse width modulation circuit 112 become incoherent.
  • the pulse width modulation circuits 111 and 112 perform pulse width modulation on the same digital modulation signal output from the modem 11, a desired signal component of the digital modulation signal output from the pulse width modulation circuit 111, and The desired signal component of the digital modulation signal output from the pulse width modulation circuit 112 becomes coherent.
  • the noise component becomes incoherent and the desired signal component becomes coherent when ⁇ modulation circuits 51 and 52 in FIG. 4 having the same circuit configuration are set with different operating conditions. This is the same as when the noise component becomes incoherent and the desired signal component becomes coherent.
  • the modulation signal output circuit unit 92 mounts the pulse width modulation circuits 111 and 112 having the same circuit configuration, and the pulse width modulation circuits 111 and 112 Since the setting circuit 113 for setting different operating conditions is mounted, the noise accompanying the pulse width modulation of the digital modulation signal can be reduced and the SNR can be increased as in the eighth embodiment. As compared with the case where the pulse width modulation circuits 101 and 102 having different circuit configurations are mounted, the load required for circuit development of the pulse width modulation circuits 111 and 112 can be reduced.
  • the modulation signal output circuit unit 91 mounts one modem 11, and the modem 11 transmits the same digital modulation signal to the pulse width modulation circuit 101, 102 (or pulse width modulation circuits 111 and 112), the modulation signal output circuit unit includes a plurality of modems that generate the same digital modulation signal, and a plurality of modems and a plurality of modems.
  • the modulation signal output circuit units may be connected one to one.
  • FIG. 13 is a block diagram showing a modulation signal output circuit section 93 of a digital transmitter according to Embodiment 12 of the present invention.
  • the modulation signal output circuit unit 93 includes modems 11a and 11b, pulse width modulation circuits 111 and 112, and a setting circuit 113.
  • FIG. 13 shows an example in which two modems are mounted, N modems and N pulse width modulation circuits may be mounted.
  • the modems 11a and 11b When the modems 11a and 11b generate the same digital modulation signal, the same operation as in the eleventh embodiment can be realized. If the pulse width modulation circuits 101 and 102 are mounted instead of the pulse width modulation circuits 111 and 112, the same operation as in the eighth to tenth embodiments can be realized. Further, when the modulation signal output circuit section 93 in FIG. 13 is connected to the high frequency section 4 in FIG.
  • the timing output from the pulse width modulation circuit 111 to the high frequency circuit 21 and the pulse width modulation If the output timing of the digital modulation signal from the modems 11a and 11b is controlled so that the timing output from the circuit 112 to the high frequency circuit 22 is shifted, the digital modulation signal radiated from the antennas 41 and 42 of the high frequency unit 4 is controlled.
  • the radiation direction can be controlled in an arbitrary direction.
  • the modulation signal output circuit unit 93 mounts the two modems 11a and 11b and outputs the timing from the pulse width modulation circuit 111 to the high frequency circuit 21, and from the pulse width modulation circuit 112 to the high frequency circuit 22.
  • the control of the output timing of the digital modulation signal from the modems 11a and 11b is shown so that the output timing is deviated, one modem 11 and the pulse width modulation circuits 101 and 102 (or the pulse width modulation circuit) are shown.
  • 111, 112) may be inserted respectively to control the amount of delay of the digital modulation signal by the plurality of delay circuits.
  • radiation is radiated from the antennas 41, 42 of the high-frequency unit 4.
  • the radiation direction of the digital modulation signal can be controlled in an arbitrary direction.
  • FIG. 14 is a block diagram showing a modulation signal output circuit unit 94 of a digital transmitter according to Embodiment 13 of the present invention.
  • the modulation signal output circuit unit 94 includes a modem 11, pulse width modulation circuits 111 and 112, a setting circuit 113, delay circuits 81 and 82, and a delay control circuit 83.
  • the timing output from the pulse width modulation circuit 111 to the high frequency circuit 21 and the pulse width modulation If the delay control circuit 83 controls the delay amount in the delay circuits 81 and 82 so that the timing output from the circuit 112 to the high-frequency circuit 22 is shifted, the digital signal radiated from the antennas 41 and 42 of the high-frequency unit 4 is controlled.
  • the radiation direction of the modulation signal can be controlled in an arbitrary direction.
  • the digital transmitter according to the present invention is suitable for a digital transmitter that needs to directly transmit a digital modulation signal generated by a digital circuit such as a modem in a high frequency band.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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  • Transmitters (AREA)
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Abstract

L'invention concerne un émetteur numérique comprenant : un modem (11) qui module des données de communication pour générer un signal numérique modulé ; des circuits de modulation ΔΣ (12, 13) qui assurent la modulation delta-sigma du signal numérique modulé généré par le modem (11) pour obtenir en sortie les signaux numériques modulés comme étant modulés delta-sigma ; des circuits à haute fréquence (21, 22) qui convertissent les puissances de signal des signaux numériques modulés obtenus en sortie par les circuits de modulation ΔΣ (12, 13) à un niveau de puissance désiré, et qui convertissent les fréquences des signaux numériques modulés à partir de fréquences d'IF en une fréquence de RF ; et un circuit synthétiseur (23) qui synthétise le signal numérique modulé comme étant converti par le circuit à haute fréquence (21) avec le signal numérique modulé comme étant converti par le circuit à haute fréquence (22) pour obtenir en sortie un signal synthétisé des deux signaux numériques modulés, les configurations de circuits des circuits de modulation ΔΣ (12, 13) étant différentes l'une de l'autre.
PCT/JP2015/082259 2015-11-17 2015-11-17 Émetteur numérique WO2017085789A1 (fr)

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CN111510119A (zh) * 2020-04-30 2020-08-07 矽力杰半导体技术(杭州)有限公司 频率调制电路以及应用其的发射机
RU2758587C1 (ru) * 2021-05-11 2021-11-01 Акционерное общество Научно-производственный центр "Электронные вычислительно-информационные системы" (АО НПЦ "ЭЛВИС") Устройство высокоскоростной передачи данных с использованием цифровой модуляции и псевдослучайной перестройки рабочей частоты (варианты)
WO2023199394A1 (fr) * 2022-04-12 2023-10-19 三菱電機株式会社 Expéditeur numérique
WO2023223523A1 (fr) * 2022-05-20 2023-11-23 三菱電機株式会社 Circuit de modulation delta-sigma, circuit de transmission numérique et émetteur numérique

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JP2003204294A (ja) * 2002-01-08 2003-07-18 Nec Saitama Ltd 送信ダイバーシチ遅延補正方式
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JP2003204294A (ja) * 2002-01-08 2003-07-18 Nec Saitama Ltd 送信ダイバーシチ遅延補正方式
EP2506426A1 (fr) * 2011-03-31 2012-10-03 Alcatel Lucent Procédé d'amplification de signal et dispositif d'amplification correspondant

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Publication number Priority date Publication date Assignee Title
CN111510119A (zh) * 2020-04-30 2020-08-07 矽力杰半导体技术(杭州)有限公司 频率调制电路以及应用其的发射机
CN111510119B (zh) * 2020-04-30 2023-10-27 矽力杰半导体技术(杭州)有限公司 频率调制电路以及应用其的发射机
RU2758587C1 (ru) * 2021-05-11 2021-11-01 Акционерное общество Научно-производственный центр "Электронные вычислительно-информационные системы" (АО НПЦ "ЭЛВИС") Устройство высокоскоростной передачи данных с использованием цифровой модуляции и псевдослучайной перестройки рабочей частоты (варианты)
WO2023199394A1 (fr) * 2022-04-12 2023-10-19 三菱電機株式会社 Expéditeur numérique
WO2023223523A1 (fr) * 2022-05-20 2023-11-23 三菱電機株式会社 Circuit de modulation delta-sigma, circuit de transmission numérique et émetteur numérique

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