JP2007173960A - Radio communication system and signal distortion reducing method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radio communication system capable of making a bias voltage of a modulator and an amplifier constant, which are used for correcting distortion due to an input signal or non-linearity of a device used for a radio system. <P>SOLUTION: Since an identifying reproducer 101 makes the degree of the distortion of a data signal to be input constant, even if various data signals having different degrees of distortion are input, a receiver side can always output a data signal in which the distortion has been corrected. Also, even if the various data signals having different degree of distortion are input, adjustment for each input signal of a bias voltage of a modulator 103 to be used for correcting the distortion is not required. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a radio communication system and a signal distortion reduction method for a radio communication system.

  In recent years, a wireless communication system using millimeter waves has been developed to cope with an increase in the amount of data to be transmitted by wireless communication. For example, as described in Non-Patent Document 1, a wireless communication system that uses a 60 GHz band and reaches a communication speed of 1.25 Gbps has already been developed.

  FIG. 6 is a configuration diagram of such a wireless communication system.

  In the wireless communication system shown in FIG. 6, communication is performed as follows.

  In the wireless transmitter 1F, the carrier signal generator 102 generates a carrier signal, the modulator 103 superimposes the input data signal on the carrier signal, the amplifier 105 amplifies the signal from the modulator 103, and the filter 106 Passes a part of the band from the signal from the amplifier 105, and the antenna 107 radiates the signal from the filter 106.

  In the radio receiver 2E, the antenna 21 receives a signal from the antenna 107, the filter 22 passes a part of the signal band from the antenna 21, the amplifier 23 amplifies the signal from the filter 22, and the detector 24 The data signal is demodulated from the signal from the amplifier 23.

  Compared to the low-frequency region, the non-linearity of the modulator, amplifier, and detector is significant in the millimeter-wave region, so that the demodulated data signal is distorted and the cross-point of the data signal deviates greatly from the center. There is.

  In addition, as described in Non-Patent Document 2, studies on a wireless communication system that generates a wireless signal using an optical technique have been started as the frequency increases.

  However, since the optical modulator used for data modulation in such a wireless communication system has a stronger non-linearity, the distortion of the data signal after demodulation becomes more remarkable.

  For this reason, in such a wireless communication system, a technique such as lowering the modulation degree of the optical modulator has been used to maintain linearity.

However, when the modulation degree of the optical modulator is lowered, the modulation degree of the optical carrier signal is lowered, which causes a problem that a larger received power is required.
K. Ohata, K. Maruhashi, M. Ito, S. Kishimoto, K. Ikuina, T. Hashiguchi, N. Takahashi, and S. Iwanaga, “Wireless 1.25Gb / s transceiver module at 60GHz-band,” in Tech, Dig, ISSCC 2002, pp.298-299, 2002. A. Hirata, M. Harada, T. Nagatsuma, “12-GHz wireless link using photonic techniques for generation, modulation, and emission of millimeter-wave signals,” IEEE Transactions on Microwave theory and Techniques, Vol. 52, pp. 1843 -1850, 2004.

  The present invention has been made in view of the above problems, and its purpose is to correct distortion caused by nonlinearity of an input signal or a device used in a wireless communication system. An object of the present invention is to provide a radio communication system capable of keeping the bias voltage of a modulator or amplifier constant.

  In order to solve the above problems, the present invention of claim 1 is directed to an identification regenerator to which a data signal is inputted, a carrier signal generator for generating a carrier signal, and a data signal from the identification regenerator to the carrier. A modulator superimposed on the signal; a DC bias voltage source capable of adjusting a DC bias voltage applied to the modulator; an amplifier for amplifying the signal from the modulator; and a part of the signal from the amplifier A wireless transmitter including a filter that passes a band; an antenna that radiates a signal from the filter; an antenna that receives a signal from the antenna; and a filter that passes a partial band of the signal from the antenna; An amplifier that amplifies the signal from the filter, a detector that demodulates a data signal from the signal from the amplifier, and an identification reproduction that receives the data signal from the detector A wireless communication system that reduces distortion in the demodulated data signal by adjusting the DC bias voltage, wherein the identification regenerator of the wireless transmitter includes the identification regenerator The DC bias voltage can be kept constant by making the degree of distortion of the data signal inputted to the signal constant as a solving means.

  According to a second aspect of the present invention, there is provided an identification regenerator to which a data signal is input, a data signal amplifier for amplifying the data signal from the identification regenerator, and adjustment of a cross-point adjusting voltage applied to the data signal amplifier. Possible cross-point adjustment voltage source, carrier signal generator for generating a carrier signal, modulator for superimposing the data signal from the data signal amplifier on the carrier signal, and amplifier for amplifying the signal from the modulator A radio transmitter comprising: a filter that passes a part of a band in a signal from the amplifier; and an antenna that radiates a signal from the filter; an antenna that receives a signal from the antenna; and A filter that passes a part of the signal band, an amplifier that amplifies the signal from the filter, and a data signal recovered from the signal from the amplifier. And a radio receiver including an identification regenerator to which a data signal from the detector is input, and reducing distortion in the demodulated data signal by adjusting the voltage for crosspoint adjustment In the wireless communication system, the identification regenerator of the wireless transmitter can keep the cross-point adjustment voltage constant by making the degree of distortion of the data signal input to the identification regenerator constant. A wireless communication system is used as a solution.

  According to a third aspect of the present invention, there is provided an identification regenerator to which a data signal is input, a carrier signal generator for generating a carrier signal, a modulator for superimposing the data signal from the identification regenerator on the carrier signal, A radio transmitter comprising an amplifier that amplifies a signal from the modulator, a filter that passes a partial band in the signal from the amplifier, and an antenna that radiates a signal from the filter, and a signal from the antenna An antenna that receives a signal from the antenna, an amplifier that amplifies the signal from the filter, a detector that demodulates a data signal from the signal from the amplifier, and the detector A data signal amplifier for amplifying a data signal from the signal and a cross-point adjustment voltage capable of adjusting a cross-point adjustment voltage applied to the data signal amplifier And a radio receiver including an identification regenerator to which a data signal is input from the data signal amplifier, and a distortion in the demodulated data signal is reduced by adjusting the voltage for crosspoint adjustment The identification regenerator of the wireless transmitter can maintain the cross-point adjustment voltage constant by making the degree of distortion of the data signal input to the identification regenerator constant. Let the communication system be the solution.

  According to a fourth aspect of the present invention, there is provided an identification regenerator to which a data signal is inputted, an optical carrier signal generator for generating an optical carrier signal, and an optical modulation for superimposing the data signal from the identification regenerator on the optical carrier signal. , A DC bias voltage source capable of adjusting a DC bias voltage applied to the optical modulator, a photoelectric conversion element that converts an optical signal from the optical modulator into an electrical signal, and a signal from the photoelectric conversion element A radio transmitter comprising: an amplifier that amplifies the signal; a filter that passes a part of a band of a signal from the amplifier; and an antenna that radiates a signal from the filter; and an antenna that receives a signal from the antenna; A filter that passes a partial band of the signal from the antenna; an amplifier that amplifies the signal from the filter; and a detector that demodulates a data signal from the signal from the amplifier; A wireless communication system comprising: a wireless receiver including an identification regenerator to which a data signal from the detector is input; and reducing distortion in the demodulated data signal by adjusting the DC bias voltage, The radio transmitter identification regenerator has a wireless communication system characterized in that the DC bias voltage can be kept constant by making the degree of distortion of the data signal input to the identification regenerator constant. To do.

  According to the present invention of claim 5, the radio transmitter includes a converter that converts an input optical data signal into a data signal that is an electric signal and inputs the data signal to an identification regenerator of the radio transmitter, and the radio receiver 5. The wireless communication system according to claim 1, further comprising a converter that converts a data signal, which is an electrical signal from an identification regenerator of the wireless transmitter, into an optical data signal. Let it be a solution.

  According to the radio communication system of the present invention, the identification regenerator of the radio transmitter makes the degree of distortion of the data signal input to the identification regenerator constant, so that it is used in the input signal and the radio communication system. It becomes possible to make the bias voltage of the modulator or amplifier used to correct distortion caused by the nonlinearity of the device constant.

  In addition, since an optical signal is converted into an electric signal, transmitted and received, and converted again into an optical signal, a signal having a high transmission rate can be transmitted over a long distance.

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

[First Embodiment]
FIG. 1 is a configuration diagram of a radio communication system according to the first embodiment of the present invention.

  The wireless communication system shown in FIG. 1 includes a wireless transmitter 1A and a wireless receiver 2A.

  The wireless transmitter 1A includes an identification regenerator 101 to which a data signal is input, a carrier signal generator 102 that generates a carrier signal, a modulator 103 that superimposes the data signal from the identification regenerator 101 on the carrier signal, and modulation. A DC bias voltage source 104 capable of adjusting a DC bias voltage applied to the amplifier 103, an amplifier 105 for amplifying a signal from the modulator 103, and a filter 106 for passing a partial band in the signal from the amplifier 105; And an antenna 107 that radiates a signal from the filter 106.

  The modulator 103 uses a non-linear element such as a diode, and can control non-linearity by a DC bias voltage.

  The radio receiver 2A includes an antenna 21 that receives a signal from the antenna 107, a filter 22 that passes a partial band of the signal from the antenna 21, an amplifier 23 that amplifies the signal from the filter 22, and a A detector 24 that demodulates the data signal from the signal and an identification regenerator 25 to which the data signal from the detector 24 is input are provided.

(Operation of the first embodiment)
Next, the operation of the first embodiment will be described.

  In the wireless transmitter 1A, the identification regenerator 101 makes the degree of distortion of the input data signal constant, and the carrier signal generator 102 generates a carrier signal.

  The discriminator / reproducer 101 determines the threshold of the amplitude of the data signal based on the given timing pulse, and outputs a high voltage or a low voltage according to the determination result, thereby making the degree of distortion of the data signal constant. Such an operation is the same in other identification regenerators.

  The DC bias voltage source 104 applies a DC bias voltage to the modulator 103, and the modulator 103 superimposes the data signal from the discriminator / reproducer 101 on the carrier signal. The amplifier 105 amplifies the signal from the modulator 103, the filter 106 passes a partial band in the signal from the amplifier 105, and the antenna 107 radiates the signal from the filter 106.

  In the radio receiver 2 </ b> A, the antenna 21 receives a signal from the antenna 107, and the filter 22 passes a partial band of the signal from the antenna 21. The amplifier 23 amplifies the signal from the filter 22, and the detector 24 demodulates the data signal from the signal from the amplifier 23. The identification regenerator 25 makes the degree of distortion of the data signal from the detector 24 constant.

  In the demodulated data signal, signal distortion may occur due to the identification regenerator, amplifier, filter, detector, and the like, and the cross point of the data signal may shift from the center.

  By adjusting the DC bias voltage applied to the modulator 103 from the DC bias voltage source 104, the nonlinearity of the modulator 103 is controlled, so that the distortion can be reduced.

  The distortion can be reduced most by adjusting the DC bias voltage so that the cross point of the demodulated data signal is centered.

  By the way, since the degree of distortion of the data signal input to the identification / regenerator 101 varies, if this data signal is input to the modulator 103, the cross point of the demodulated data signal is shifted from the center, and the signal distortion is reduced. There are cases where it cannot always be reduced. In order to constantly reduce the signal distortion, it is necessary to adjust the DC bias voltage.

  However, here, the discriminator / reproducer 101 makes the degree of distortion of the input data signal constant, so that even if various data signals having different degrees of distortion are inputted, distortion is always corrected on the receiving side. Data signal is output. Further, even when various data signals having different degrees of distortion are input, it is not necessary to adjust the bias voltage used for correcting the distortion for each input signal.

  In place of the identification regenerator 25, a clock regenerator having the function may be used.

[Second Embodiment]
FIG. 2 is a configuration diagram of a radio communication system according to the second embodiment of the present invention. Here, the same symbol is used for the same name used in the wireless transmitter, and the same symbol is used for the same name used in the wireless receiver. The same applies to the third and subsequent embodiments.

  The wireless communication system shown in FIG. 2 includes a wireless transmitter 1B and a wireless receiver 2B.

  The wireless transmitter 1B includes an identification regenerator 101 to which a data signal is input, a data signal amplifier 108 that amplifies the data signal from the identification regenerator 101, and a cross-point adjustment voltage (DC bias) applied to the data signal amplifier 108. Voltage) 109 that can adjust the voltage), a carrier signal generator 102 that generates a carrier signal, a modulator 103 that superimposes the data signal from the data signal amplifier 108 on the carrier signal, and a modulator 103 An amplifier 105 that amplifies the signal from the amplifier 105, a filter 106 that passes a partial band in the signal from the amplifier 105, and an antenna 107 that radiates the signal from the filter 106. The data signal amplifier 108 can control non-linearity by a cross-point adjustment voltage.

  The wireless transmitter 1B includes a voltage source that applies a DC bias voltage to the modulator 103, but is not shown here.

  The radio receiver 2B includes an antenna 21 that receives a signal from the antenna 107, a filter 22 that passes a partial band of the signal from the antenna 21, an amplifier 23 that amplifies the signal from the filter 22, and a A detector 24 for demodulating a data signal from the signal, a data signal amplifier 26 for amplifying the data signal from the detector 24, a clock regenerator 27 for recovering a clock signal from the data signal from the data signal amplifier 26, and a clock recovery And an identification regenerator 25 to which the data signal that has passed through the device 27 is input.

  The radio receiver 2B includes a voltage source that applies a DC bias voltage to the data signal amplifier 26, but is not shown here.

(Operation of Second Embodiment)
Next, the operation of the second embodiment will be described.

  In the wireless transmitter 1B, the identification regenerator 101 makes the degree of distortion of the input data signal constant, and the carrier signal generator 102 generates a carrier signal. The cross-point adjustment voltage source 109 applies a cross-point adjustment voltage (DC bias voltage) to the data signal amplifier 108, and the data signal amplifier 108 amplifies the data signal from the identification regenerator 101. The modulator 103 superimposes the data signal from the data signal amplifier 108 on the carrier signal, and the amplifier 105 amplifies the signal from the modulator 103. The filter 106 passes a part of the band from the signal from the amplifier 105, and the antenna 107 radiates the signal from the filter 106.

  In the radio receiver 2 </ b> A, the antenna 21 receives a signal from the antenna 107, and the filter 22 passes a partial band of the signal from the antenna 21. The amplifier 23 amplifies the signal from the filter 22, and the detector 24 demodulates the data signal from the signal from the amplifier 23. The data signal amplifier 26 amplifies the data signal from the detector 24, and the clock regenerator 27 regenerates the clock signal included in the data signal from the data signal amplifier 26. The identification regenerator 25 makes the degree of distortion of the data signal from the detector 24 that has passed through the clock regenerator 27 constant. The clock signal is used when the signal from the identification regenerator 25 is processed.

  In the demodulated data signal, signal distortion may occur due to the identification regenerator, amplifier, filter, detector, and the like, and the cross point of the data signal may shift from the center.

  By adjusting the cross-point adjustment voltage (DC bias voltage) applied from the cross-point adjustment voltage source 109 to the data signal amplifier 108, the nonlinearity of the data signal amplifier 108 is controlled, so that the distortion is reduced. Can do.

  By adjusting the cross-point adjustment voltage so that the cross-point of the demodulated data signal is centered, distortion can be reduced most.

  In addition, since the discriminator / reproducer 101 makes the degree of distortion of the input data signal constant, even if various data signals having different degrees of distortion are inputted, the data signal whose distortion is always corrected on the receiving side. Is output. Further, even when various data signals having different degrees of distortion are input, it is not necessary to adjust the bias voltage used for correcting the distortion for each input signal.

  Further, the clock signal is used when processing the signal from the identification regenerator 25, so that the transmission characteristics of the wireless communication system of the present embodiment are improved.

  Note that the data signal amplifier 26 and the clock regenerator 27 are not essential, and one or both of them may not be used.

[Third Embodiment]
FIG. 3 is a configuration diagram of a radio communication system according to the third embodiment of the present invention.

  The wireless communication system shown in FIG. 3 includes a wireless transmitter 1C and a wireless receiver 2C.

  The wireless transmitter 1C includes an identification regenerator 101 to which a data signal is input, a data signal amplifier 108 that amplifies the data signal from the identification regenerator 101, a carrier signal generator 102 that generates a carrier signal, and a data signal amplifier. From the modulator 103 that superimposes the data signal from the signal 108 on the carrier signal, the amplifier 105 that amplifies the signal from the modulator 103, the filter 106 that passes a part of the band from the signal from the amplifier 105, and the filter 106 And an antenna 107 that radiates the above signal.

  The wireless transmitter 1C includes a voltage source that applies a DC bias voltage to the modulator 103, but is not shown here. The wireless transmitter 1C includes a voltage source that applies a DC bias voltage to the data signal amplifier 108, but is not illustrated here.

  The radio receiver 2C includes an antenna 21 that receives a signal from the antenna 107, a filter 22 that passes a partial band of the signal from the antenna 21, an amplifier 23 that amplifies the signal from the filter 22, and a A detector 24 that demodulates a data signal from the signal, a data signal amplifier 26 that amplifies the data signal from the detector 24, and a cross-point adjustment voltage (DC bias voltage) applied to the data signal amplifier 26 can be adjusted. A cross-point adjusting voltage source 28, a clock regenerator 27 that regenerates a clock signal from the data signal from the data signal amplifier 26, and an identification regenerator 25 to which the data signal that has passed through the clock regenerator 27 is input.

  The data signal amplifier 26 can control non-linearity by the cross-point adjustment voltage.

(Operation of the third embodiment)
Next, the operation of the third embodiment will be described.

  In the wireless transmitter 1C, the identification regenerator 101 makes the degree of distortion of the input data signal constant, and the carrier signal generator 102 generates a carrier signal. The data signal amplifier 108 amplifies the data signal from the identification regenerator 101. The modulator 103 superimposes the data signal from the data signal amplifier 108 on the carrier signal, and the amplifier 105 amplifies the signal from the modulator 103. The filter 106 passes a part of the band from the signal from the amplifier 105, and the antenna 107 radiates the signal from the filter 106.

  In the wireless receiver 2 </ b> C, the antenna 21 receives a signal from the antenna 107, and the filter 22 passes a partial band of the signal from the antenna 21. The amplifier 23 amplifies the signal from the filter 22, and the detector 24 demodulates the data signal from the signal from the amplifier 23. The cross-point adjusting voltage source 28 applies a cross-point adjusting voltage (DC bias voltage) to the data signal amplifier 26, and the data signal amplifier 26 amplifies the data signal from the detector 24. The clock regenerator 27 regenerates the clock signal included in the data signal from the data signal amplifier 26. The identification regenerator 25 makes the degree of distortion of the data signal from the detector 24 that has passed through the clock regenerator 27 constant. The clock signal is used when the signal from the identification regenerator 25 is processed.

  In the demodulated data signal, signal distortion may occur due to the identification regenerator, amplifier, filter, detector, and the like, and the cross point of the data signal may shift from the center.

  By adjusting the cross-point adjustment voltage (DC bias voltage) applied from the cross-point adjustment voltage source 28 to the data signal amplifier 26, the nonlinearity of the data signal amplifier 26 is controlled, so that the distortion is reduced. Can do.

  By adjusting the cross-point adjustment voltage so that the cross-point of the demodulated data signal is centered, distortion can be reduced most.

  In addition, since the discriminator / reproducer 101 makes the degree of distortion of the input data signal constant, even if various data signals having different degrees of distortion are inputted, the data signal whose distortion is always corrected on the receiving side. Is output. Further, even when various data signals having different degrees of distortion are input, it is not necessary to adjust the bias voltage used for correcting the distortion for each input signal.

  Further, the clock signal is used when processing the signal from the identification regenerator 25, so that the transmission characteristics of the wireless communication system of the present embodiment are improved.

  Note that the data signal amplifier 108 and the clock regenerator 27 are not essential, and one or both of them may not be used.

[Fourth Embodiment]
FIG. 4 is a configuration diagram of a radio communication system according to the fourth embodiment of the present invention.

  The wireless communication system shown in FIG. 4 includes a wireless transmitter 1D and a wireless receiver 2B.

  The wireless transmitter 1D includes an identification regenerator 101 to which a data signal is input, a data signal amplifier 108 that amplifies the data signal from the identification regenerator 101, an optical carrier signal generator 110 that generates an optical carrier signal, and data An optical modulator 111 that superimposes the data signal from the signal amplifier 108 on the optical carrier signal, a DC bias voltage source 112 that can adjust the DC bias voltage applied to the optical modulator 111, and an optical signal from the optical modulator 111 A photoelectric conversion element (for example, a photodiode or a phototransistor) 113 that converts the signal from the photoelectric conversion element 113, an amplifier 105 that amplifies the signal from the photoelectric conversion element 113, and a filter 106 that passes a part of the band from the signal from the amplifier 105. And an antenna 107 that radiates a signal from the filter 106.

The optical modulator 103 is a LiNbO ₃ optical modulator or the like, and can control nonlinearity by a DC bias voltage.

  The wireless transmitter 1D includes a voltage source that applies a DC bias voltage to the data signal amplifier 108, but is not shown here.

  Since the configuration of the wireless receiver 2B is described in the second embodiment, the description thereof is omitted here.

(Operation of the fourth embodiment)
Next, the operation of the fourth embodiment will be described.

  In the wireless transmitter 1D, the identification regenerator 101 makes the degree of distortion of the input data signal constant, and the optical carrier signal generator 110 generates an optical carrier signal that is an optical signal. The data signal amplifier 108 amplifies the data signal from the identification regenerator 101. The DC bias voltage source 112 applies a DC bias voltage to the optical modulator 111, and the optical modulator 111 superimposes the data signal from the data signal amplifier 108 on the optical carrier signal. The photoelectric conversion element 113 converts the optical signal from the optical modulator 111 into an electric signal, and the amplifier 105 amplifies the signal from the photoelectric conversion element 113. The filter 106 passes a part of the band from the signal from the amplifier 105, and the antenna 107 radiates the signal from the filter 106.

  Since the operation of the radio receiver 2B is described in the second embodiment, it is omitted here.

  In the demodulated data signal, signal distortion may occur due to the identification regenerator, amplifier, filter, detector, and the like, and the cross point of the data signal may shift from the center.

  By adjusting the DC bias voltage applied to the optical modulator 111 from the DC bias voltage source 112, the nonlinearity in the modulation of the optical modulator 111 is controlled, so that the distortion can be reduced.

  The distortion can be reduced most by adjusting the DC bias voltage so that the cross point of the demodulated data signal is centered.

  In addition, since the discriminator / reproducer 101 makes the degree of distortion of the input data signal constant, even if various data signals having different degrees of distortion are inputted, the data signal whose distortion is always corrected on the receiving side. Is output. Further, even when various data signals having different degrees of distortion are input, it is not necessary to adjust the bias voltage used for correcting the distortion for each input signal.

  Further, the clock signal is used when processing the signal from the identification regenerator 25, so that the transmission characteristics of the wireless communication system of the present embodiment are improved.

  The data signal amplifiers 108 and 26 and the clock regenerator 27 are not essential, and any one, two or all of them may not be used.

[Fifth Embodiment]
FIG. 5 is a configuration diagram of a radio communication system according to the fifth embodiment of the present invention.

  A wireless transmitter 1E shown in FIG. 5 is provided with a converter 114 that converts an input optical data signal into a data signal that is an electric signal and inputs the data signal to the identification regenerator 101 with respect to the wireless transmitter 1A. .

  The radio receiver 2D shown in FIG. 5 is provided with a converter 29 that converts a data signal, which is an electrical signal from the identification / regenerator 25, into an optical data signal with respect to the radio receiver 2A.

  In the wireless transmitter 1E, the converter 114 converts an optical data signal, which is an input optical signal, into a data signal, which is an electrical signal, and inputs the data signal to the identification regenerator 101. Other operations are the same as those of the wireless transmitter 1A.

  In the wireless receiver 2D, the converter 29 converts the data signal, which is an electrical signal from the identification / regenerator 25, into an optical data signal, which is an optical signal. Other operations are the same as those of the wireless receiver 2A. As described above, in the fifth embodiment, since an optical signal is converted into an electric signal, transmitted and received, and converted into an optical signal again, a signal having a transmission rate exceeding 1 Gbps can be transmitted over a long distance.

  By the way, the optical data signal input to the converter 114 has various degrees of distortion due to intensity noise, jitter, and the like applied in the process of long-distance transmission, so that the data signal from the converter 114 is assumed to be the modulator 103. If the signal is input to, the cross point of the demodulated data signal is shifted from the center, and the signal distortion may not always be reduced. In order to constantly reduce the signal distortion, it is necessary to adjust the DC bias voltage.

  However, here, the discriminator / reproducer 101 makes the degree of distortion of the input data signal constant, so that even if various data signals having different degrees of distortion are inputted, distortion is always corrected on the receiving side. Data signal is output. Further, even when various data signals having different degrees of distortion are input, it is not necessary to adjust the bias voltage used for correcting the distortion for each input signal.

  Each converter 114, 29 may be used in the second, third, or fourth embodiment.

1 is a configuration diagram of a radio communication system according to a first embodiment of the present invention. It is a block diagram of the radio | wireless communications system which concerns on the 2nd Embodiment of this invention. It is a block diagram of the radio | wireless communications system which concerns on the 3rd Embodiment of this invention. It is a block diagram of the radio | wireless communications system which concerns on the 4th Embodiment of this invention. It is a block diagram of the radio | wireless communications system which concerns on the 5th Embodiment of this invention. It is a block diagram of the conventional radio | wireless communications system.

Explanation of symbols

1A, 1B, 1C, 1D, 1E, 1F ... Radio transmitters 2A, 2B, 2C, 2D, 2E ... Radio receivers 21, 107 ... Antennas 22, 106 ... Filters 23, 105 ... Amplifiers 24 ... Detectors 25, 101 ... identification regenerator 26, 108 ... data signal amplifier 27 ... clock regenerator 28, 109 ... crosspoint adjustment voltage source 29, 114 ... converter 102 ... carrier signal generator 103 ... modulator 104, 112 ... DC bias voltage source DESCRIPTION OF SYMBOLS 110 ... Optical carrier signal generator 111 ... Optical modulator 113 ... Photoelectric conversion element

Claims (5)

An identification regenerator to which a data signal is input;
A carrier signal generator for generating a carrier signal;
A modulator for superimposing the data signal from the identification regenerator on the carrier signal;
A DC bias voltage source capable of adjusting a DC bias voltage applied to the modulator;
An amplifier for amplifying the signal from the modulator;
A filter that passes a partial band in the signal from the amplifier;
A radio transmitter comprising an antenna for radiating a signal from the filter, and
An antenna for receiving a signal from the antenna;
A filter that passes a partial band of the signal from the antenna;
An amplifier for amplifying the signal from the filter;
A detector for demodulating a data signal from the signal from the amplifier;
A wireless communication system including an identification regenerator to which a data signal from the detector is input, and reducing distortion in the demodulated data signal by adjusting the DC bias voltage,
The wireless communication system, wherein the identification regenerator of the wireless transmitter keeps the DC bias voltage constant by making the degree of distortion of the data signal inputted to the identification regenerator constant. An identification regenerator to which a data signal is input;
A data signal amplifier for amplifying a data signal from the identification regenerator;
A crosspoint adjusting voltage source capable of adjusting a crosspoint adjusting voltage applied to the data signal amplifier;
A carrier signal generator for generating a carrier signal;
A modulator for superimposing a data signal from the data signal amplifier on the carrier signal;
An amplifier for amplifying the signal from the modulator;
A filter that passes a partial band in the signal from the amplifier;
A radio transmitter comprising an antenna for radiating a signal from the filter, and
An antenna for receiving a signal from the antenna;
A filter that passes a partial band of the signal from the antenna;
An amplifier for amplifying the signal from the filter;
A detector for demodulating a data signal from the signal from the amplifier;
A radio communication system comprising a radio receiver including an identification / regenerator to which a data signal from the detector is input, and reducing distortion in the demodulated data signal by adjusting the voltage for crosspoint adjustment. And
The wireless communication system, wherein the identification regenerator of the wireless transmitter makes the crosspoint adjustment voltage constant by making the degree of distortion of the data signal inputted to the identification regenerator constant. An identification regenerator to which a data signal is input;
A carrier signal generator for generating a carrier signal;
A modulator for superimposing the data signal from the identification regenerator on the carrier signal;
An amplifier for amplifying the signal from the modulator;
A filter that passes a partial band in the signal from the amplifier;
A radio transmitter comprising an antenna for radiating a signal from the filter, and
An antenna for receiving a signal from the antenna;
A filter that passes a partial band of the signal from the antenna;
An amplifier for amplifying the signal from the filter;
A detector for demodulating a data signal from the signal from the amplifier;
A data signal amplifier for amplifying the data signal from the detector;
A crosspoint adjusting voltage source capable of adjusting a crosspoint adjusting voltage applied to the data signal amplifier;
A wireless communication system comprising: a wireless receiver including an identification regenerator to which a data signal is input from the data signal amplifier; and reducing distortion in the demodulated data signal by adjusting the crosspoint adjustment voltage. And
The wireless communication system, wherein the identification regenerator of the wireless transmitter makes the crosspoint adjustment voltage constant by making the degree of distortion of the data signal inputted to the identification regenerator constant. An identification regenerator to which a data signal is input;
An optical carrier signal generator for generating an optical carrier signal;
An optical modulator for superimposing the data signal from the identification regenerator on the optical carrier signal;
A DC bias voltage source capable of adjusting a DC bias voltage applied to the optical modulator;
A photoelectric conversion element that converts an optical signal from the optical modulator into an electrical signal;
An amplifier for amplifying a signal from the photoelectric conversion element;
A filter that passes a partial band in the signal from the amplifier;
A radio transmitter comprising an antenna for radiating a signal from the filter, and
An antenna for receiving a signal from the antenna;
A filter that passes a partial band of the signal from the antenna;
An amplifier for amplifying the signal from the filter;
A detector for demodulating a data signal from the signal from the amplifier;
A wireless communication system including an identification regenerator to which a data signal from the detector is input, and reducing distortion in the demodulated data signal by adjusting the DC bias voltage,
The wireless communication system, wherein the identification regenerator of the wireless transmitter keeps the DC bias voltage constant by making the degree of distortion of the data signal inputted to the identification regenerator constant. The wireless transmitter includes a converter that converts an input optical data signal into a data signal that is an electrical signal and inputs the data signal to an identification regenerator of the wireless transmitter,
The wireless receiver according to any one of claims 1 to 4, wherein the wireless receiver includes a converter that converts a data signal, which is an electrical signal from an identification regenerator of the wireless transmitter, into an optical data signal. Communications system.

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