JP2018037726A - Conversion rule deriving device, communication device, and conversion rule deriving and providing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a conversion rule derivation device, a communication device, and a conversion rule derivation providing method capable of supporting various modulation methods and reducing the amount of information required for mapping. SOLUTION: A control unit 12 sets a signal point in a second digital modulation method among each signal point in the first digital modulation method in a signal space diagram based on a value stored in the storage unit 11. A conversion rule for converting the bit string corresponding to the overlapping signal point and the bit string corresponding to the signal point and the overlapping signal point in the second digital modulation method with each other is derived. The providing unit 13 provides the communication device with the conversion rule derived by the control unit 12. [Selection diagram] FIG. 20

Description

  The present invention relates to a conversion rule derivation device, a communication device, and a conversion rule derivation providing method.

  A communication device that performs digital modulation may support a plurality of multilevel modulation schemes. For example, in IEEE (Institute of Electrical and Electronics Engineers) 802.11ac, which is a standard for wireless LAN (Local Area Network), the communication device is BPSK (Binary Phase Shift Key BP). (Amplitude Modulation), 64QAM and 256QAM modulation must be supported.

  In addition, a communication device that communicates using a cable television line may support a plurality of multilevel modulation schemes. For example, in DOCSIS (Data Over Cable Service Specifications) 3.1, which is a standard of a communication system using a cable television line, the communication device is 1024QAM, 2048QAM and 4096QAM for downlink communication, 128QAM, 256QAM, 512QAM for uplink communication. It is necessary to support modulation by 1024QAM, 2048QAM and 4096QAM.

  QAM is a modulation scheme that maps binary data to corresponding signal points in a two-dimensional coordinate system composed of an I (In-phase) component and a Q (Quadrature) component. For example, in 256QAM, 8-bit data is mapped to any of 256 signal points in a two-dimensional coordinate system (a two-dimensional complex plane coordinate system including an I axis and a Q axis).

  In the invention described in Patent Document 1, a bit is added to a predetermined position of the input bit string, and further, the value of a part or all of the input bit string is inverted, thereby converting the bit string. Done. In the invention described in Patent Document 1, a mapping process for mapping the converted bit string to any symbol on the signal space diagram corresponding to the modulation method is performed.

JP, 2014-143532, A

  In the invention described in Patent Document 1, only a bit addition operation and a bit inversion operation are performed, and it can be applied to BPSK, QPSK, 16QAM, 32QAM, 64QAM, and 256QAM. However, the invention is also applicable to a specific modulation system such as 128QAM. It is preferable that it is applicable.

  An object of the present invention is to provide a conversion rule deriving device, a communication device, and a conversion rule deriving and providing method that can cope with various modulation schemes and reduce the amount of information necessary for mapping. And

  In the conversion rule deriving device of the present invention, in a plurality of digital modulation schemes that can be supported by a communication device, a value corresponding to a signal point in a signal space diagram of each digital modulation scheme is associated with a bit string corresponding to the signal point. Based on the stored storage means and the value stored in the storage means, in the signal space diagram, out of the signal points in the first digital modulation system, the signal points in the second digital modulation system Control means for deriving a conversion rule for mutually converting a bit string corresponding to a signal point overlapping with the signal point and a bit string corresponding to the signal point overlapping with the signal point in the second digital modulation scheme; Providing means for providing the communication device with the conversion rule derived by the means.

  The communication device of the present invention is based on the signal arrangement in the signal space diagram, and a bit string corresponding to the value of each signal point of the first digital modulation method and each of the second digital modulation methods overlapping each signal point. Based on the conversion rule for mutually converting the bit string corresponding to the value of the signal point, the transmission data according to the first digital modulation method is converted into the converted data according to the second digital modulation method. Data conversion means for converting, modulation means for generating a transmission signal by modulating the converted data by the second digital modulation method, and transmission means for transmitting the transmission signal.

  A communication apparatus according to another aspect of the present invention includes a demodulating unit that demodulates a received transmission signal into post-conversion data by a demodulation method according to the transmission signal, and a first digital modulation method based on a signal arrangement in a signal space diagram. Based on a conversion rule for mutually converting a bit string corresponding to the value of each signal point and a bit string corresponding to the value of each signal point in the second digital modulation scheme, which overlaps with each signal point, Data conversion means for converting the converted data according to the second digital modulation method into transmission data according to the first digital modulation method.

  In the conversion rule derivation and provision method of the present invention, in a plurality of digital modulation schemes that can be supported by a communication apparatus, a value corresponding to a signal point in a signal space diagram of each digital modulation scheme is associated with a bit string corresponding to the signal point. Based on the value stored in the storage means stored in the signal, in the signal space diagram, among the signal points in the first digital modulation system, signals that overlap with the signal points in the second digital modulation system A conversion rule for mutually converting a bit string corresponding to a point and a bit string corresponding to a signal point overlapping with the signal point in the second digital modulation method is derived, and the derived conversion rule is used as the communication device. To provide.

  A wide range of modulation methods can be supported, and the amount of information required for mapping can be reduced.

It is a figure which shows the structural example of the communication system in 1st Embodiment. It is a block diagram which shows the structural example of the conversion rule derivation | leading-out apparatus in 1st Embodiment. It is a figure which shows an example of the signal space diagram according to 128QAM in 1st Embodiment. It is a figure which shows an example of the information of the bit stream according to each signal point of 128QAM in 1st Embodiment. It is a figure which shows an example of the signal space diagram according to 256QAM in 1st Embodiment. It is a figure which shows an example of the information of the bit stream according to each signal point of 256QAM in 1st Embodiment. It is a figure which shows the information of the bit sequence which overlaps with the bit sequence corresponding to the signal point according to 128QAM among the information of the bit sequence corresponding to the signal point according to 256QAM in 1st Embodiment. It is a block diagram which shows the structural example of the communication apparatus in 1st Embodiment. In 1st Embodiment, it is explanatory drawing which shows the example of the conversion rule for mutually converting the bit sequence according to 256QAM, and the bit sequence according to 128QAM. It is a block diagram which shows the structural example of the communication apparatus in 1st Embodiment. It is a flowchart which shows the process of the conversion rule derivation | leading-out apparatus in 1st Embodiment. It is a flowchart which shows the process of the communication apparatus in 1st Embodiment. It is a figure which shows an example of the signal point by which the data (bit sequence) according to 128QAM are mapped among each signal point according to 256QAM in 1st Embodiment. It is a flowchart which shows the process of the communication apparatus in 1st Embodiment. In a 1st embodiment, it is a figure showing an example of a conversion rule for mutually converting a bit sequence according to 256QAM, and a bit sequence according to 64QAM. In a 1st embodiment, it is a figure showing an example of a conversion rule for mutually converting a bit sequence according to 256QAM, and a bit sequence according to 32QAM. It is a figure which shows an example of the conversion rule for mutually converting the bit sequence according to 256QAM, and the bit sequence according to 16QAM in 1st Embodiment. In a 1st embodiment, it is a figure showing an example of a conversion rule for mutually converting a bit sequence according to 256QAM, and a bit sequence according to QPSK. It is a figure which shows the structural example of the communication system in 2nd Embodiment. It is a block diagram which shows the structural example of the conversion rule derivation | leading-out apparatus in 3rd Embodiment. It is a block diagram which shows the structural example of the communication apparatus in 4th Embodiment. It is a block diagram which shows the structural example of the communication apparatus in 5th Embodiment.

<First Embodiment>
FIG. 1 is a block diagram illustrating a configuration example of a communication system 1 according to the first embodiment. The communication system 1 includes a conversion rule derivation device 100, a transmission-side communication device 200, and a reception-side communication device 300. The conversion rule deriving device 100, the communication device 200, and the communication device 300 are connected to be communicable with each other, and, for example, communicate with each other via a wireless transmission line or a wired transmission line.

  FIG. 2 is a block diagram illustrating a configuration example of the conversion rule deriving device 100. As illustrated in FIG. 2, the conversion rule deriving device 100 includes a control unit 110, a storage unit 120, and an output unit 130.

  Based on the value of the I component and the value of the Q component at the position of each signal point on the signal space diagram corresponding to the predetermined modulation method stored in the storage unit 120, the control unit 110 corresponds to the predetermined modulation method. A conversion rule for converting the bit string into a bit string according to another predetermined modulation method is derived.

  For example, the control unit 110 derives a conversion rule for mutually converting a bit string corresponding to 256QAM data and a bit string corresponding to 128QAM data. For example, the control unit 110 includes a bit string corresponding to a memory address storing the value of the I component and the value of the Q component on each signal point on the signal space diagram corresponding to 128QAM, and a signal space corresponding to 256QAM. A conversion rule is derived by comparing the value of the I component and the value of the Q component at the position of each signal point on the diagram with the bit string corresponding to the memory address. Details of the conversion rule derivation process by the control unit 110 will be described later.

  Further, for example, the control unit 110 is realized by a CPU (Central Processing Unit) that executes processing according to program control, a plurality of circuits, and the like.

  The storage unit 120 stores the value of the I component and the value of the Q component at the position of each signal point according to the predetermined modulation method using the data (bit string) according to the predetermined modulation method as the memory address. .

  FIG. 3 is a diagram illustrating an example of a signal space diagram according to 128QAM. FIG. 4 is a diagram illustrating an example of bit string information corresponding to each 128QAM signal point. FIG. 5 is a diagram illustrating an example of a signal space diagram according to 256QAM. FIG. 6 is a diagram illustrating an example of bit string information corresponding to each signal point of 256QAM. FIG. 7 is a diagram illustrating bit string information overlapping with a bit string corresponding to a signal point corresponding to 128 QAM, out of bit string information corresponding to a signal point corresponding to 256 QAM.

  For example, the storage unit 120 stores the values of the I component and the Q component of each signal point on the signal space diagram according to 128QAM as shown in FIG. It is stored in the memory address of the bit string corresponding to the point. Further, for example, in the storage unit 120, among the signal points on the signal space diagram according to 256QAM as shown in FIG. 5, the value of the I component and the value of the Q component at the position corresponding to each signal point of 128QAM Is stored in a memory address of a bit string corresponding to each signal point of 256QAM as shown in FIG.

  For example, the signal point 140 shown in FIG. 3 corresponds to the 7-bit bit string 150 (“0000001”) shown in FIG. 4, and the bit string 150 is shown to be mapped to the signal point 140. The value of the I component and the value of the Q component at the position of the signal point 140 are stored in the memory address “0000001” of the storage unit 120. The signal point 180 shown in FIG. 5 corresponds to the 8-bit bit string 190 (“01100011”) shown in FIGS. 6 and 7, and the bit string 190 may be mapped to the signal point 180. The value of the I component and the value of the Q component at the position of the signal point 180 are stored in the memory address “01100011” of the storage unit 120.

  In the storage unit 120, for example, the memory address of the bit string corresponding to each signal point of 128QAM in which the value of the I component and the value of the Q component are stored in the position of each signal point on the signal space diagram according to 128QAM. Among the signal points on the signal space diagram corresponding to 256QAM, the bit sequence corresponding to each signal point of 256QAM storing the value of the I component and the value of the Q component corresponding to each signal point of 128QAM These memory addresses are set so as not to overlap each other.

  For example, the I component value and the Q component value at the position of each signal point on the signal space diagram according to 128QAM are stored in the storage unit 120 at the beginning of the bit string corresponding to each signal point of 128QAM, “00”. It is stored at the memory address with bits added. For example, the value of the I component and the value of the Q component at the position of the signal point 140 shown in FIG. 3 are stored in the memory address “000000001” of the storage unit 120.

  Also, for example, among the signal points on the signal space diagram according to 256QAM, the value of the I component and the value of the Q component at the position corresponding to each signal point of 128QAM are stored in the storage unit 120 in each signal point of 256QAM. Is stored in a memory address in which 1 bit of “1” is added to the head of the bit string corresponding to. For example, the value of the I component and the value of the Q component at the position of the signal point 180 shown in FIG. 5 are stored in the memory address “101100011” of the storage unit 120. When the 1 bit or 2 bits are added to the head, for example, the control unit 110 deletes the 1 bit or 2 bits added to the head when deriving a conversion rule to be described later.

  For example, the storage unit 120 stores only the value of the I component and the value of the Q component at the position corresponding to each signal point of 128 QAM among the signal points on the signal space diagram corresponding to 256 QAM. Alternatively, all the values of the I component and the Q component at the position corresponding to each signal point on the signal space diagram according to 256QAM may be stored.

  In addition, the storage unit 120 stores a variable m and a variable n. Here, the variable m indicates the bit position of data corresponding to the input 128QAM. Since the data according to 128QAM is 7 bits, m is a value of 0 or more and 6 or less. A variable n indicates a bit position of data corresponding to 256QAM. Since data corresponding to 256QAM is 8 bits, n is a value of 0 or more and 7 or less.

  In each bit string, the 0th bit is an LSB (Least Significant Bit). In the bit string of data corresponding to 128QAM, the sixth bit (m = 6) is the MSB (Most Significant Bit), and the seventh bit (n = 7) in the bit string of data corresponding to 256QAM. ) Is the MSB.

  The storage unit 120 also stores conversion rule information derived by the control unit 110. For example, the storage unit 120 is realized by a memory or the like.

  The output unit 130 transmits the conversion rule information derived by the control unit 110. For example, the output unit 130 is realized by a transmitter, an antenna, and the like, and transmits conversion rule information to the communication device 200 and the communication device 300.

  FIG. 8 is a block diagram illustrating a configuration example of the communication apparatus 200. As illustrated in FIG. 8, the communication device 200 includes a control unit 210, a storage unit 220, and a communication unit 230. The communication device 200 is, for example, a communication device that performs wired communication using a cable television line or the like, or a communication device such as a base station or user terminal that performs wireless communication.

  The storage unit 220 stores the value of the I component and the value of the Q component at the position of each signal point on the signal space diagram corresponding to a predetermined modulation method. The storage unit 220 stores information on conversion rules used by the control unit 210. The storage unit 220 is realized by, for example, a memory or a hard disk.

  For example, the storage unit 220 stores the values of the I component and the Q component at the position of each signal point on the signal space diagram corresponding to 256QAM as shown in FIG. It is stored in the memory address of the bit string corresponding to the point. For example, in FIG. 5, a signal point 160 corresponds to the 8-bit bit string 170 (“00000000”) illustrated in FIG. 6, and the bit string 170 is mapped to the signal point 160, and the storage unit The value of the I component and the value of the Q component of the signal point 160 are stored at the memory address “00000000” of 220.

  FIG. 9 is an explanatory diagram illustrating an example of a conversion rule. For example, the storage unit 220 stores a conversion rule for converting data according to 128QAM into data according to 256QAM as shown in FIG. For example, FIG. 9 shows a bit string “D, y3, y2, C, B, y1, y0, A” corresponding to 256QAM and a bit string “D, x2, x1, C, B” corresponding to 128QAM. , X0, A ″ are shown as conversion rules. In FIG. 9, a bit string of bits according to 128QAM is converted into a bit string of bits according to 256QAM in the direction of the arrow indicated by the solid line. In the conversion rule shown in FIG. 9, the bit values at positions corresponding to A, B, C, and D included in the bit string corresponding to 128QAM and the bit string corresponding to 256QAM are the same value.

  Further, positions corresponding to y0, y1, y2, and y3 included in the bit string corresponding to 256QAM according to combinations of values of the respective bits at positions corresponding to x0, x1, and x2 included in the bit string corresponding to 128QAM. The combination of the values of each bit in is determined.

  The relationship between the combination of bit values at positions corresponding to x0, x1, and x2 and the combination of bit values at positions corresponding to y0, y1, y2, and y3 is shown in the conversion rule table 121 shown in FIG. ing. For example, when all the bit values at positions corresponding to x0, x1 and x2 included in the bit string corresponding to 128QAM are “0” (in the case of the second row of the conversion rule table 121 shown in FIG. 9), 256QAM The value of each bit at the position corresponding to y3, y2, y1, and y0 included in the corresponding bit string is determined as “1”, “1”, “0”, and “1”.

  The control unit 210 converts the input data (bit string) input from the communication unit 230 based on the control signal indicating the modulation method and the conversion rule information stored in the storage unit 220.

  Further, the control unit 210 corresponds to the input data based on the value of the I component and the value of the Q component at the position of each signal point on the signal space diagram corresponding to the predetermined modulation method stored in the storage unit 220. The signal point is mapped, and the I component value and the Q component value at the mapped signal point position are input to the communication unit 230. For example, the control unit 210 refers to the memory address of the storage unit 220 corresponding to the bit string of the input data, and acquires the I component value and the Q component value at the position of the signal point stored in the referenced memory address. Then, the acquired I component value and Q component value at the position of the signal point are input to the communication unit 230.

  Communication apparatus 200 includes a modulation scheme determining unit that determines a modulation scheme, and the control signal may be a signal input from the modulation scheme determining unit. Further, a device different from the communication device 200 may determine the modulation method, and the control signal may be a signal transmitted from the other device.

  In addition, the control unit 210 inputs information indicating a modulation method of input data to the communication unit 230. The information indicating the modulation method of the input data is, for example, information indicating 128QAM when the input data (bit string) according to 128QAM is converted into the input data (bit string) according to 256QAM. The information indicating the modulation method of the input data is, for example, information indicating 256QAM when conversion processing is not performed in the control unit 210 due to input of data (bit string) according to 256QAM. It is. The control unit 210 is realized by, for example, a CPU that executes processing according to program control, a plurality of circuits, and the like.

  The communication unit 230 receives the conversion rule information transmitted from the conversion rule deriving device 100 and inputs the conversion rule information to the storage unit 220. In addition, the communication unit 230 inputs input data input from an external device or the like to the control unit 210. The communication unit 230 modulates a carrier wave based on the I component value and the Q component value input from the control unit 210, and transmits the modulated carrier wave. When information indicating the modulation method of input data is input from the control unit 210, the communication unit 230 transmits a modulated carrier wave including information indicating the modulation method of input data. For example, the communication unit 230 is realized by a transmitter, a receiver, an antenna, and the like.

  For example, when the communication apparatus 200 is a base station, the communication unit 230 transmits the modulated carrier wave to a communication terminal (such as a user terminal). Further, when the communication device 200 is a communication terminal (user terminal or the like), the communication unit 230 transmits the modulated carrier wave to the base station.

  FIG. 10 is a block diagram illustrating a configuration example of the communication device 300. As illustrated in FIG. 10, the communication device 300 includes a control unit 310, a storage unit 320, and a communication unit 330. The communication device 300 is, for example, a communication device that performs wired communication using a cable television line or the like, or a communication device such as a base station or a user terminal that performs wireless communication.

  The storage unit 320 stores the value of the I component and the value of the Q component at the position of each signal point on the signal space diagram corresponding to a predetermined modulation method. Further, the storage unit 320 stores information on conversion rules used by the control unit 310. The storage unit 320 is realized by, for example, a memory or a hard disk.

  For example, in the storage unit 320, the I component value and the Q component value at the position of each signal point on the signal space diagram corresponding to 256QAM as shown in FIG. It is stored in the memory address of the bit string corresponding to the point. For example, in FIG. 5, a signal point 160 corresponds to the 8-bit bit string 170 (“00000000”) illustrated in FIG. 6, and the bit string 170 is mapped to the signal point 160, and the storage unit The value of the I component and the value of the Q component of the signal point 160 are stored at 320 memory address “00000000”.

  For example, the storage unit 320 stores a conversion rule for converting data conforming to 256QAM into data conforming to 128QAM as shown in FIG. For example, FIG. 9 shows a bit string “D, x2, x1, C, B, x0, A” according to 128QAM and a bit string “D, y3, y2, C, B, y1 according to 256QAM. , Y0, A ″ are shown as conversion rules. In FIG. 9, a bit string of bits according to 256QAM is converted into a bit string of bits according to 128QAM in the direction of the arrow indicated by a broken line. In the conversion rule shown in FIG. 9, the bit values at positions corresponding to A, B, C, and D included in the bit string according to 128QAM and the bit string according to 256QAM are the same value.

  Further, positions corresponding to y0, y1, y2, and y3 included in the bit string corresponding to 256QAM according to combinations of values of the respective bits at positions corresponding to x0, x1, and x2 included in the bit string corresponding to 128QAM. The combination of the values of each bit in is determined.

  The relationship between the combination of bit values at positions corresponding to x0, x1, and x2 and the combination of bit values at positions corresponding to y0, y1, y2, and y3 is shown in the conversion rule table 121 shown in FIG. ing. For example, when the value of each bit in the position corresponding to y3, y2, y1 and y0 included in the bit string according to 256QAM is “1”, “1”, “0” and “1” (shown in FIG. 9) In the case of the second row of the conversion rule table 121), the values of the bits at the positions corresponding to x0, x1 and x2 included in the bit string corresponding to 128QAM are all determined to be “0”.

  The communication unit 330 receives the conversion rule information transmitted from the conversion rule deriving device 100 and inputs the conversion rule information to the storage unit 320. Further, the communication unit 330 receives a signal transmitted from the communication device 200 and inputs the signal to the control unit 310. In addition, the communication unit 330 outputs the input data of the communication device 200 input from the control unit 310 to an external device such as a set top box, for example. For example, the communication unit 330 is realized by a transmitter, a receiver, an antenna, and the like.

  For example, when the communication apparatus 300 is a base station, the communication unit 330 receives a modulated carrier wave from a communication terminal (such as a user terminal). Further, when the communication apparatus 300 is a communication terminal (such as a user terminal), the communication unit 330 receives the modulated carrier wave from the base station.

  The communication unit 330 determines whether or not the received signal includes information indicating the modulation method of the input data. If the communication unit 330 determines that information indicating the modulation method of the input data is included, the communication unit 330 inputs a control signal indicating the modulation method to the control unit 310. The control signal indicating the modulation method is, for example, a control signal indicating 128QAM when input data (bit string) corresponding to 128QAM is converted into input data (bit string) corresponding to 256QAM in the communication apparatus 200. is there. In addition, the control signal indicating the modulation method indicates, for example, that the communication device 200 is 256QAM when the input data (bit string) according to 128QAM is not converted into the input data (bit string) according to 256QAM. It is a control signal.

  For example, the communication unit 330 receives a signal indicating a modulation method from a device different from the communication device 300, and inputs a control signal indicating the modulation method to the control unit 310 based on the signal indicating the modulation method. May be. For example, the signal indicating the modulation scheme is a signal indicating 128QAM or a signal indicating 256QAM. For example, when the communication unit 330 receives a signal indicating 128 QAM, the communication unit 330 inputs a control signal indicating 128 QAM to the control unit 310. The communication device 300 is configured to include a modulation method determination unit that receives a control signal indicating a modulation method transmitted from a device different from the communication device 300 and inputs the received control signal to the control unit 310. May be.

  The control unit 310 demodulates the modulated carrier wave received by the communication unit 330. For example, when the communication unit 330 receives a signal, the control unit 310 acquires the value of the I component and the value of the Q component of the received signal. Then, for example, control unit 310 acquires the I component value and Q component value at the position of the signal point corresponding to the modulation applied to the received signal, and stores the I component value and Q component value. The memory address of the storage unit 320 is referred to, and the value of the memory address is acquired as received data (bit string).

  When the control signal indicating the modulation method is input, the control unit 310 converts the acquired received data (bit string) into the input data of the communication device 200 based on the conversion rule information stored in the storage unit 320. For example, when the control signal indicates 128 QAM, the control unit 310 converts received data (bit string) according to 256 QAM based on the conversion rule shown in FIG. 9 stored in the storage unit 320. Then, input data (bit string) of the communication apparatus 200 according to 128QAM is acquired. Then, the control unit 310 inputs the acquired input data of the communication device 200 to the communication unit 330. Note that the control unit 310 is realized by, for example, a CPU that executes processing according to program control, a plurality of circuits, and the like.

  FIG. 11 is a flowchart showing conversion rule derivation processing by the conversion rule derivation device 100. In the flowchart shown in FIG. 11, the conversion rule deriving device 100 derives a conversion rule for mutually converting a bit string (7 bits) of data according to 128QAM and a bit string (8 bits) of data according to 256QAM. To do.

  Control unit 110 sets the values of variable m and variable n to 0, and stores the values of variable m and variable n in storage unit 120 (step S101).

  The control unit 110 includes a bit string corresponding to the memory address of the storage unit 120 in which the I component value and the Q component value at the position of each signal point on the signal space diagram according to 128 QAM are stored, and 256 QAM. The bit string corresponding to the memory address of the storage unit 120 storing the value of the I component and the value of the Q component at the position of each signal point on the signal space diagram is compared. Then, the control unit 110 determines whether or not the m-th bit value of the bit string corresponding to 128QAM is equal to the n-th bit value of the bit string corresponding to 256QAM at each signal point (step S102).

  For example, when m = 0 and n = 0 in the process of step S102, the control unit 110 corresponds to the signal point 140 shown in FIG. 3 and the 0th bit of the bit string 150 (“0000001”) shown in FIG. It is determined whether or not the value is equal to the value of the 0th bit of the bit string 190 (“01100011”) shown in FIG. 7 corresponding to the signal point 180 shown in FIG. In this example, the control unit 110 has a value of the 0th bit of the bit string 150 corresponding to the signal point 140 and a value of the 0th bit of the bit string 190 corresponding to the signal point 180 at the same signal point position as the signal point 140. Are equal to each other.

  When the control unit 110 determines that the value of the m-th bit of the bit string corresponding to 128QAM is equal to the value of the n-th bit of the bit string corresponding to 256QAM (YES in step S102), the control unit 110 sets m of the bit string corresponding to 128QAM. A conversion rule for deriving the bit value at the nth bit of the bit string according to 256QAM is derived (step S103). And the control part 110 transfers to the process of step S104.

  When the control unit 110 determines that the value of the m-th bit of the bit string according to 128QAM is not equal to the value of the n-th bit of the bit string according to 256QAM (NO in step S102), the control unit 110 proceeds to the process of step S104. To do.

  The control unit 110 determines whether or not the value of m is the MSB of the bit string corresponding to 128QAM in the process of step S104 (step S104).

  When determining that the value of m is not the MSB of the bit string corresponding to 128QAM (NO in step S104), the control unit 110 determines whether the value of n is the MSB of the bit string corresponding to 256QAM ( Step S105).

  When the control unit 110 determines that the value of n is not the MSB of the bit string corresponding to 256QAM (NO in step S105), the control unit 110 adds 1 to the value of n (step S106) and stores the changed n in the storage unit 120. After storing the value, the control unit 110 proceeds to the process of step S102.

  When the control unit 110 determines that the value of n is the MSB of the bit string according to 256QAM (YES in step S105), the control unit 110 adds 1 to the value of m and sets the value of n to 0 (step S107). After storing the changed values of m and n in the storage unit 120, the control unit 110 proceeds to the process of step S102.

  By performing the above processing, the conversion rule deriving device 100 performs, for example, A, B, C, and D in the bit string corresponding to 128QAM shown in the upper left column of FIG. 9 and the bit string corresponding to 256QAM shown in the upper right column. A conversion rule for the bit at the corresponding position can be derived. In the example shown in FIG. 9, the value of the bit at the position corresponding to A, B, C and D in the bit string corresponding to 128QAM is changed to the bit at the position corresponding to A, B, C and D in the bit string corresponding to 256QAM. It shows that they are arranged.

  When the control unit 110 determines that the value of m is the MSB of the bit string corresponding to 128QAM (YES in step S104), the control unit 110 converts the bit in the bit string corresponding to 128QAM to the bit in the bit string corresponding to 256QAM. Derive the conversion rule of the bit value that is not done.

  Specifically, among the bits of the bit string according to 128QAM, the combination of the bit values not converted into the bits of the bit string according to 256QAM is X, and among the bits of the bit string according to 256QAM, according to 128QAM Let Y be a combination of bit values in which no bit value is arranged in the bit string.

  In the example shown in FIG. 9, among the bits of the bit string according to 128QAM, the combination of the values of the respective bits at positions corresponding to x2, x1 and x0 is X, and among the bits of the bit string according to 256QAM, y3, The combination of the values of the bits at the positions corresponding to y2, y1 and y0 is Y. Note that the combination X and the combination Y correspond to each other and correspond to combinations of predetermined values.

  The control unit 110 includes a bit string corresponding to the memory address of the storage unit 120 in which the I component value and the Q component value at the position of each signal point on the signal space diagram according to 128 QAM are stored, and 256 QAM. The bit string corresponding to the memory address of the storage unit 120 storing the value of the I component and the value of the Q component at the position of each signal point on the signal space diagram is compared. Then, the control unit 110 determines whether or not the combination Y has the same value for the specific combination X at each signal point (step S108).

  For example, the control unit 110 has 256QAM at the same position as each signal point in 128QAM corresponding to the bit string “D00CB0A” (bit values corresponding to x2, x1, and x0 are all 0) according to 128QAM. It is checked whether or not all the Y values of the bit strings corresponding to the signal points in FIG.

  In the case of the bit string “D00CB0A” corresponding to 128QAM, when comparing the bit strings shown in FIGS. 4 and 7, all the bit strings corresponding to 256QAM at the signal points at the same position are “D11CB01A”. In this example, in the case of the combination X in which the values of the bits corresponding to x2, x1, and x0 are all 0, the control unit 110 sets each bit at the position corresponding to y3, y2, y1, and y0. It is determined that the values are “1”, “1”, “0”, and “1” (that is, the combination Y is “1101”). Therefore, the conversion rule for the second row in the lower conversion rule table 121 shown in FIG. 9 is derived.

  The control unit 110 determines whether or not the corresponding combination Y has the same value for all possible combinations of the combination X. In this example, the control unit 110 determines whether or not the corresponding combination Y has the same value for a total of eight combinations X that can be taken by a total of 3 bits at positions corresponding to x2, x1, and x0. .

  When the control unit 110 determines that the combination Y has the same value for the specific combination X (YES in step S108), the control unit 110 derives a conversion rule table indicating the conversion rules in the combination X and the combination Y, and the storage unit 120 stores information on conversion rules including the derived conversion rule table and the conversion rules derived in step S103 (step S109). The output unit 130 transmits the conversion rule information including the derived conversion rule table and the conversion rule derived in step S103 to the communication device 200 and the communication device 300 (step S109), and ends the process.

  Therefore, in FIG. 9, the value of the bit corresponding to x2, x1, and x0 included in the bit string corresponding to 128QAM and the position corresponding to y3, y2, y1, and y0 included in the bit string corresponding to 256QAM are shown. A conversion rule including a conversion rule table 121 for converting bit values to each other is shown. For example, when all the bit values at positions corresponding to x0, x1 and x2 included in the bit string corresponding to 128QAM are “0” (in the case of the second row of the conversion rule table 121 shown in FIG. 9), 256QAM The value of each bit at the position corresponding to y3, y2, y1, and y0 included in the corresponding bit string is determined as “1”, “1”, “0”, and “1”.

  If control unit 110 determines that combination Y does not have the same value for specific combination X (NO in step S108), control unit 110 ends the process without deriving a conversion rule table. For example, when it is determined that the combination Y does not have the same value for any one of the specific combinations X, the control unit 110 ends the process without deriving the conversion rule table.

  FIG. 12 is a flowchart illustrating processing when the communication apparatus 200 converts input data according to a predetermined modulation scheme into input data according to another predetermined modulation scheme based on a conversion rule. Although FIG. 12 shows an example of processing when the communication device 200 is a base station, similar processing is performed when the communication device 200 is a communication terminal (such as a user terminal). In the following, a processing example when the communication apparatus 200 converts input data according to 128QAM into input data according to 256QAM will be described.

  The communication unit 230 receives the conversion rule information transmitted from the conversion rule deriving device 100, and inputs the conversion rule information to the storage unit 220 (step S201). The storage unit 220 stores conversion rule information input from the communication unit 230.

  When modulation using 128QAM is specified by the control signal and the input data is transmitted, the control unit 210 converts the input data into a bit string corresponding to 256QAM based on the conversion rule information (step S202).

  For example, the control unit 210 divides the input data into 7 bits and converts the 7-bit input data into 8-bit data based on the conversion rule information stored in the storage unit 220. For example, the control unit 210 converts the 7-bit bit string “D, x2, x1, C, B, x0, A” according to 128QAM into the 8-bit bit string according to 256QAM “based on the conversion rule shown in FIG. D, y3, y2, C, B, y1, y0, A ″. For example, the control unit 210 converts the bit string 150 “0000001” shown in FIG. 4 corresponding to the signal point 140 shown in FIG. 3 to the signal point 180 shown in FIG. The bit string 190 shown is converted to “01100011”.

  Based on the converted bit string and the value of the I component and the value of the Q component at the position of the 256QAM signal point stored in the memory address corresponding to the converted bit string, the control unit 210 sets the corresponding signal point. The converted bit string is mapped (step S203). Then, control unit 210 inputs the value of the I component and the value of the Q component at the mapped signal point position to communication unit 230. FIG. 13 is a diagram illustrating an example of signal points to which data corresponding to 128 QAM is mapped among signal points corresponding to 256 QAM. For example, data corresponding to 128QAM is mapped to signal points in the frame 122 among signal points corresponding to 256QAM, as shown in FIG. FIG. 7 is an explanatory diagram showing bit string information corresponding to each signal point in the frame 122.

  The communication unit 230 modulates the carrier wave based on the I component value and the Q component value at the mapped signal point position, and transmits the modulated carrier wave to the communication apparatus 300 (step S204).

  When 256QAM is indicated by the control signal, the control unit 210 does not convert the bit string.

  FIG. 14 is a flowchart illustrating processing in which the communication apparatus 300 converts received data of a predetermined modulation scheme into received data of another predetermined modulation scheme based on the conversion rule. In FIG. 14, the process is shown by way of example when the communication apparatus 300 is a base station, but the same process is performed when the communication apparatus 300 is a communication terminal (such as a user terminal). In the following, a processing example in which the communication apparatus 300 converts received data according to 256QAM into received data according to 128QAM will be described.

  The communication unit 330 receives the conversion rule information from the conversion rule deriving device 100 and inputs the conversion rule information to the storage unit 320 (step S301). The storage unit 320 stores information on conversion rules input from the communication unit 330.

  When the communication unit 330 receives a signal modulated to 256QAM, the control unit 310, based on the received signal, the value of the I component and the Q component at the position of the signal point to which the data included in the received signal is mapped Get the value of. Then, the control unit 310 refers to the memory address of the storage unit 320 corresponding to the acquired I component value and Q component value, and acquires the value of the memory address as data (bit string) according to the received 256QAM. (Step S302).

  When the control signal indicates that it is 128QAM, based on the conversion rule information, the control unit 310 converts data corresponding to 256QAM into data corresponding to 128QAM, and converts the data corresponding to 128QAM. Obtain (step S303). For example, the control unit 310 converts an 8-bit bit string “D, y3, y2, C, B, y1, y0, A” according to 256QAM into a 7-bit according to 128QAM based on the conversion rule shown in FIG. The bit string is converted to “D, x2, x1, C, B, x0, A”. For example, the control unit 310 converts the bit string 190 “011000011” shown in FIG. 7 corresponding to the signal point 180 shown in FIG. 5 based on the conversion rule shown in FIG. 9, and corresponds to the signal point 140 shown in FIG. 4 is acquired. When the control signal indicates 256QAM, the control unit 310 does not convert the bit string.

  Note that the conversion rule deriving device 100 may be included in the communication device 200. Further, the conversion rule deriving device 100 may be included in the communication device 300.

  According to the present embodiment, the conversion rule deriving device 100 can derive a conversion rule applicable to 128QAM. Therefore, the communication apparatus 200 can convert a bit string according to 128QAM into a bit string according to 256QAM based on the conversion rule. Then, the communication apparatus 200 can perform mapping of 7-bit input data according to 128QAM using the value of the I component and the value of the Q component at the position of the signal point according to 256QAM.

  Therefore, the storage unit 220 of the communication device 200 stores the I component value and the Q component value for 384 signal point positions (the I component value and the Q component for 128 signal point positions used for 128QAM). And the I component of the position of 256 signal points used for 256QAM, without the need to store the value of the signal point, and the value of I component and Q component of 256 signal points used for 256QAM. Only the value of Q and the value of the Q component need be stored, and the amount of information stored in the storage unit 220 is reduced. In terms of the number of words, the storage unit 220 needs to store information of a total of 768 words, but only information of a total of 512 words needs to be stored.

  Similarly, the communication apparatus 300 can convert a bit string according to 256QAM into a bit string according to 128QAM based on the conversion rule. Therefore, only the I component value and Q component value at the position of 256 signal points used for 256QAM need to be stored in the storage unit 320, and the amount of information stored in the storage unit 320 is reduced. The Furthermore, the communication apparatus 300 can support a plurality of modulation schemes by referring to the I component value and the Q component value at the signal point position according to 256QAM. The processing load for selecting the information to be referenced can be reduced as compared with the case where the values of the I component and the Q component at different signal point positions are referred to.

  Further, according to the present embodiment, the conversion rule deriving device 100 can derive conversion rules corresponding to various modulation schemes. By using conversion rules corresponding to various modulation schemes, the communication device 200 and the communication device 300 can accommodate various modulation schemes.

  In this embodiment, the conversion rule deriving device 100 derives a conversion rule for mutually converting data according to 128QAM and data according to 256QAM. However, the conversion rule deriving device 100 determines conversion rules corresponding to other modulation schemes. It may be derived. For example, the conversion rule deriving device 100 converts a conversion rule for mutually converting data according to 128QAM and data according to 64QAM, or a conversion for mutually converting data according to 64QAM and data according to 32QAM. It may be configured to derive rules.

  In the present embodiment, the control unit 110 of the conversion rule deriving device 100 derives only the conversion rule that mutually converts data according to 128QAM and data according to 256QAM. However, the present invention is not limited to this. For example, the control unit 110 may derive a plurality of conversion rules corresponding to a plurality of modulation schemes such as QPSK, 16QAM, 32QAM, 64QAM, 128QAM, and 256QAM.

  FIG. 15 is a diagram illustrating an example of a conversion rule for mutually converting data (bit string) according to 256QAM and data (bit string) according to 64QAM. FIG. 16 is a diagram illustrating an example of a conversion rule for mutually converting data (bit string) according to 256QAM and data (bit string) according to 32QAM. FIG. 17 is a diagram illustrating an example of a conversion rule for mutually converting data (bit string) according to 256QAM and data (bit string) according to 16QAM. FIG. 18 is a diagram illustrating an example of a conversion rule for mutually converting data (bit string) according to 256QAM and data (bit string) according to QPSK. FIG. 15, FIG. 16, FIG. 17 and FIG. 18 are explanatory diagrams of a modification of the present embodiment.

  For example, as shown in FIGS. 15, 16, 17, and 18, the control unit 110 performs not only the conversion rule for 128QAM, but also data corresponding to 64 QAM (6 bits), data corresponding to 32 QAM (5 bits). ), Conversion rules for mutually converting data (4 bits) according to 16QAM and data (2 bits) according to QPSK and data (8 bits) according to 256QAM may be derived.

  In FIG. 15, FIG. 16, FIG. 17, and FIG. 18, the data according to 64QAM, the data according to 32QAM, the data according to 16QAM, and the data according to QPSK are shown in the directions of arrows indicated by solid lines. It is converted into data corresponding to 256QAM. In FIG. 15, FIG. 16, FIG. 17 and FIG. 18, the data according to 256QAM is the data according to 64QAM, the data according to 32QAM, the data according to 16QAM and the QPSK in the direction of the arrow indicated by the broken line. Is converted into data corresponding to each.

  For example, in the conversion rule shown in FIG. 15, the bit values at positions corresponding to A, B, C, and D included in the bit string corresponding to 64QAM and the bit string corresponding to 256QAM are the same value. Further, according to the combination of the values of the respective bits at the positions corresponding to x0 and x1 included in the bit string corresponding to 64QAM, each at the position corresponding to y0, y1, y2 and y3 included in the bit string corresponding to 256QAM. The combination of the values of the bits is determined.

  The relationship between the combination of bit values at positions corresponding to x0 and x1 and the combination of bit values at positions corresponding to y0, y1, y2, and y3 is shown in the conversion rule table 121. For example, when all the values of the bits corresponding to x0 and x1 included in the bit string corresponding to 64QAM are “0” (in the case of the second row of the conversion rule table 121 shown in FIG. 15), 256QAM The values of the respective bits at positions corresponding to y3, y2, y1 and y0 included in the bit string are determined as “1”, “1”, “1” and “1”.

  In FIG. 18, a bit string corresponding to QPSK and 256QAM are added by adding a predetermined bit value to a predetermined bit position or deleting a bit value at a predetermined bit position. A conversion rule for mutually converting a bit string is shown.

  Therefore, it is not necessary to store the value of the I component and the value of the Q component at the position of the signal point corresponding to each multilevel in each storage unit of the communication device 200 and the communication device 300, and the amount of information stored Is further reduced.

  For example, a communication apparatus that can modulate to QPSK, 16QAM, 32QAM, 64QAM, 128QAM, and 256QAM stores I component values and Q component values at the positions of 500 signal points used in the respective modulation schemes. It is necessary to secure a storage capacity, that is, a storage capacity for 1000 words. However, by storing the information on the plurality of conversion rules described above, the communication apparatus can store the I component value and the Q component value at the positions of 256 signal points used in 256QAM. That is, only a storage capacity for 512 words needs to be secured. That is, in this modified example, the effect is that the amount of information stored in the communication device is reduced as the number of multi-values that can be modulated is larger and the multi-value is higher.

  Further, the control unit 110 of the conversion rule deriving device 100 may be configured to derive a conversion rule for the highest-order multilevel modulation scheme that can be supported by the communication device 200 and the communication device 300.

  For example, when the communication apparatus 200 is compatible with 512QAM as the highest-order multi-level modulation scheme, the control unit 110, for example, stores data according to the modulation scheme whose multi-level is lower than 512QAM. It may be configured to derive a conversion rule for conversion into data according to 512QAM.

  With this configuration, only the highest multilevel conversion rule information is stored in the storage unit 220, and the amount of information stored in the storage unit 220 is reduced. In addition, the control unit 110 does not need to derive a plurality of conversion rules, and can reduce the processing load on the control unit 110.

  Note that the communication device 200 and the communication device 300 are configured to transmit in advance information indicating the highest multi-level modulation scheme that can be supported by the communication device 200 and the communication device 300 to the conversion rule derivation device 100. Also good. Then, the conversion rule deriving device 100 receives information indicating the highest multilevel modulation scheme that can be handled, and the control unit 110, based on the received information indicating the highest multilevel modulation scheme, It may be configured to derive a conversion rule for the highest multi-level modulation scheme.

  The communication unit 230 of the communication device 200 and the communication unit 330 of the communication device 300 may be configured to transmit a conversion rule derivation request to the conversion rule derivation device 100. The conversion rule deriving device 100 may be configured to derive a conversion rule in response to the derivation request.

  According to such a configuration, since the conversion rule deriving device 100 derives the conversion rule only when there is a request, the processing load of the conversion rule deriving device 100 can be reduced.

  For example, when transmission data to be transmitted to the communication device 200 is generated, the communication unit 230 transmits a derivation request to the conversion rule derivation device 100. For example, when the communication device 300 receives a signal from the communication device 200, the communication unit 330 transmits a derivation request to the conversion rule derivation device 100. The conversion rule derivation device 100 may be configured to receive the derivation request and derive a conversion rule in response to the derivation request.

<Second Embodiment>
FIG. 19 is a block diagram illustrating a configuration example of the communication system 2 according to the second embodiment.

  The communication system 2 includes a conversion rule derivation device 100A, a conversion rule derivation device 100B, a transmission-side communication device 200, and a reception-side communication device 300. The conversion rule deriving device 100A and the communication device 200, the conversion rule deriving device 100B and the communication device 300, and the communication device 200 and the communication device 300 are connected to each other via a wireless transmission line or a wired transmission line so that they can communicate with each other. ing.

  The configuration of the conversion rule deriving device 100A and the conversion rule deriving device 100B is the same as the configuration of the conversion rule deriving device 100 of the first embodiment. The configuration of the communication device 200 is the same as the configuration of the communication device 200 of the first embodiment. The configuration of the communication device 300 is the same as that of the communication device 300 of the first embodiment.

  The output unit 130 of the conversion rule deriving device 100A transmits the derived conversion rule information to the communication device 200. Further, the output unit 130 of the conversion rule deriving device 100B transmits information of the derived conversion rule to the communication device 300.

  According to the present embodiment, a conversion rule deriving device is connected to each of a plurality of communication devices, and each conversion rule deriving device transmits information of the derived conversion rule to each communication device, whereby conversion rule derivation is performed. The processing load of the device can be distributed.

<Third Embodiment>
FIG. 20 is a block diagram illustrating a configuration example of the conversion rule deriving device 10 according to the third embodiment. As illustrated in FIG. 20, the conversion rule derivation device 10 includes a storage unit 11, a control unit 12, and a providing unit 13.

  The storage unit 11 corresponds to, for example, the storage unit 120 in the first embodiment illustrated in FIG. The control unit 12 corresponds to, for example, the control unit 110 in the first embodiment illustrated in FIG. The providing unit 13 corresponds to, for example, the output unit 130 in the first embodiment illustrated in FIG.

  The storage unit 11 stores a value corresponding to a signal point in a signal space diagram of each digital modulation method in association with a bit string corresponding to the signal point in a plurality of digital modulation methods that can be supported by the communication apparatus. Yes. The communication device corresponds to, for example, the communication device 200 or the communication device 300 in the first embodiment illustrated in FIG.

  Based on the value stored in the storage unit 11, the control unit 12 is a signal point that overlaps the signal point in the second digital modulation method among the signal points in the first digital modulation method in the signal space diagram. And a conversion rule for mutually converting a bit string corresponding to a signal point overlapping with the signal point in the second digital modulation method.

  The providing unit 13 provides the communication device with the conversion rule derived by the control unit 12.

  According to the present embodiment, the conversion rule deriving device 10 has a value corresponding to a signal point in a signal space diagram of each digital modulation method in a plurality of digital modulation methods that can be supported by the communication device. It is stored in association with the bit string. Then, based on the value, the conversion rule deriving device 10 corresponds to a signal point that overlaps a signal point in the second digital modulation scheme among signal points in the first digital modulation scheme in the signal space diagram. A conversion rule for mutually converting a bit string and a bit string corresponding to a signal point overlapping with the signal point in the second digital modulation scheme is derived, and the derived conversion rule is provided to the communication device. Therefore, since the communication apparatus can convert the bit string based on the conversion rule, it can cope with a wide range of modulation schemes and can reduce the amount of information necessary for mapping.

<Fourth Embodiment>
FIG. 21 is a block diagram illustrating a configuration example of the communication device 14 according to the fourth embodiment. As illustrated in FIG. 21, the communication device 14 includes a data conversion unit 15, a modulation unit 16, and a transmission unit 17.

  The data conversion unit 15 corresponds to, for example, the control unit 210 in the first embodiment illustrated in FIG. The modulation unit 16 and the transmission unit 17 correspond to, for example, the communication unit 230 in the first embodiment illustrated in FIG.

  Based on the signal arrangement in the signal space diagram, the data conversion unit 15 includes a bit string corresponding to the value of each signal point in the first digital modulation method and each signal in the second digital modulation method that overlaps each signal point. Based on the conversion rule for mutually converting the bit string corresponding to the value of the point, the transmission data corresponding to the first digital modulation method is converted to the converted data corresponding to the second digital modulation method.

  The modulation unit 16 modulates the converted data by the second digital modulation method to generate a transmission signal.

  The transmission unit 17 transmits a transmission signal.

  According to this embodiment, the communication device 14 is based on the signal arrangement in the signal space diagram, the bit string corresponding to the value of each signal point of the first digital modulation method, and the second overlapping with each signal point. Conversion of transmission data according to the first digital modulation method according to the second digital modulation method based on a conversion rule for mutually converting bit strings according to the values of the signal points in the digital modulation method Convert to later data. Then, the communication device 14 modulates the converted data by the second digital modulation method to generate a transmission signal, and transmits the transmission signal. Therefore, since the communication device 14 can convert the bit string based on the conversion rule, it can cope with a wide range of modulation schemes and can reduce the amount of information necessary for mapping.

<Fifth Embodiment>
FIG. 22 is a block diagram illustrating a configuration example of the communication device 18 according to the fifth embodiment. As illustrated in FIG. 22, the communication device 18 includes a demodulator 19 and a data converter 20.

  The demodulator 19 and the data converter 20 correspond to, for example, the controller 310 in the first embodiment shown in FIG.

  The demodulator 19 demodulates the received transmission signal into post-conversion data using a demodulation method corresponding to the transmission signal.

  Based on the signal arrangement in the signal space diagram, the data conversion unit 20 includes a bit string corresponding to the value of each signal point in the first digital modulation method and each signal in the second digital modulation method that overlaps each signal point. Based on the conversion rule for mutually converting the bit string corresponding to the value of the point, the converted data corresponding to the second digital modulation scheme is converted to transmission data corresponding to the first digital modulation scheme.

  According to the present embodiment, the communication device 18 demodulates the received transmission signal into post-conversion data by a demodulation method corresponding to the transmission signal, and each signal of the first digital modulation method based on the signal arrangement in the signal space diagram. Based on a conversion rule for mutually converting a bit string corresponding to the value of the point and a bit string corresponding to the value of each signal point in the second digital modulation scheme, which overlaps with each signal point, the second The converted data according to the digital modulation method is converted into transmission data according to the first digital modulation method. Therefore, since the communication device 18 can convert the bit string based on the conversion rule, it can cope with a wide range of modulation schemes and can reduce the amount of information necessary for mapping.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to each above-mentioned embodiment. The present invention can be implemented based on modifications, substitutions, and adjustments of the embodiments. The present invention can also be implemented by arbitrarily combining the embodiments. That is, the present invention includes various modifications and corrections that can be realized in accordance with all the disclosed contents and technical ideas of the present specification. In addition, the drawing reference numerals attached to each drawing are added to each element for convenience as an example for facilitating understanding, and are not intended to limit the present invention to the illustrated embodiment.

  A part or all of the above-described embodiment can be described as in the following supplementary notes, but is not limited thereto.

(Appendix 1)
In a plurality of digital modulation schemes that can be supported by the communication device, storage means that stores values corresponding to signal points in the signal space diagram of each digital modulation scheme in association with bit strings corresponding to the signal points;
Based on the value stored in the storage means, in the signal space diagram, among signal points in the first digital modulation system, corresponding to signal points overlapping with signal points in the second digital modulation system Control means for deriving a conversion rule for mutually converting a bit string and a bit string corresponding to a signal point overlapping with the signal point in the second digital modulation scheme;
Providing means for providing the communication device with the conversion rule derived by the control means;
A conversion rule derivation device characterized by comprising:

(Appendix 2)
A value corresponding to a signal point in the signal space diagram of each digital modulation method is stored in the storage unit in an area having a corresponding bit string as a memory address.
The conversion rule deriving device according to attachment 1.

(Appendix 3)
The control means is based on whether or not values are equal to each other in bit strings corresponding to signal points overlapping each other in the signal space diagram in the first digital modulation scheme and the second digital modulation scheme. , Derive transformation rules,
The conversion rule deriving device according to Supplementary Note 1 or Supplementary Note 2.

(Appendix 4)
The control means includes a bit string corresponding to each of overlapping signal points in the signal space diagram in the first digital modulation scheme and the second digital modulation scheme, in one bit string and in the other bit string. Deriving a conversion rule that applies a digit value in one bit string to a digit in the other bit string if there are digits in the bit and values that are equal to each other;
The conversion rule derivation device according to attachment 3.

(Appendix 5)
The control means includes a bit string corresponding to each of overlapping signal points in the signal space diagram in the first digital modulation scheme and the second digital modulation scheme, in one bit string and in the other bit string. When there are digits whose values are not equal to each other, a conversion rule for deriving a combination of predetermined values corresponding to the combination of the values of the digits in one bit string is derived.
The conversion rule deriving device according to Supplementary Note 3 or Supplementary Note 4.

(Appendix 6)
Based on the signal arrangement in the signal space diagram, the bit string corresponding to the value of each signal point of the first digital modulation method and the value of each signal point in the second digital modulation method overlapping each signal point Data conversion means for converting transmission data according to the first digital modulation scheme into post-conversion data according to the second digital modulation scheme based on a conversion rule for mutually converting bit strings;
Modulation means for modulating the converted data by the second digital modulation method to generate a transmission signal;
Transmitting means for transmitting the transmission signal;
A communication apparatus comprising:

(Appendix 7)
A conversion rule deriving device for deriving the conversion rule;
The communication device according to attachment 6.

(Appendix 8)
Demodulation means for demodulating the received transmission signal into post-conversion data in a demodulation scheme according to the transmission signal;
Based on the signal arrangement in the signal space diagram, the bit string corresponding to the value of each signal point of the first digital modulation method and the value of each signal point in the second digital modulation method overlapping each signal point Data conversion means for converting the converted data according to the second digital modulation scheme into data for transmission according to the first digital modulation scheme, based on a conversion rule for mutually converting bit strings;
A communication apparatus comprising:

(Appendix 9)
A conversion rule deriving device for deriving the conversion rule;
The communication apparatus according to appendix 8.

(Appendix 10)
In a plurality of digital modulation schemes that can be supported by the communication apparatus, values corresponding to signal points in the signal space diagram of each digital modulation scheme are stored in a storage unit that is stored in association with a bit string corresponding to the signal points. In the signal space diagram, a bit string corresponding to a signal point overlapping with a signal point in the second digital modulation method among the signal points in the first digital modulation method in the signal space diagram, Deriving a conversion rule for mutually converting the signal point and the bit string corresponding to the overlapping signal point in the digital modulation system of
Providing the derived conversion rule to the communication device;
A conversion rule derivation and provision method characterized by the above.

(Appendix 11)
The conversion rule derivation / providing method according to claim 10, wherein a bit string associated with a signal point in the signal space diagram of each digital modulation scheme is a memory address in the storage unit.

(Appendix 12)
On the computer,
In a plurality of digital modulation schemes that can be supported by the communication apparatus, values corresponding to signal points in the signal space diagram of each digital modulation scheme are stored in a storage unit that is stored in association with a bit string corresponding to the signal points. In the signal space diagram, a bit string corresponding to a signal point overlapping with a signal point in the second digital modulation method among the signal points in the first digital modulation method in the signal space diagram, A derivation process for deriving a conversion rule for mutually converting a bit string corresponding to a signal point that overlaps the signal point in the digital modulation scheme of
A conversion rule derivation and provision program for executing a provision process of providing the derived conversion rule to the communication device.

(Appendix 13)
The conversion rule derivation providing program according to claim 12, wherein a bit string associated with a value corresponding to a signal point in the signal space diagram of each digital modulation method is a memory address in the storage unit.

1, 2 Communication system 10, 100, 100A, 100B Conversion rule derivation device 11, 120, 220, 320 Storage unit 12, 110 Control unit 121 Conversion rule table 122 Frame 13 Provision unit 130 Output unit 14, 18, 200, 300 Communication Device 140, 160, 180 Signal point 15, 20 Data converter 150, 170, 190 Bit string 16 Modulator 17 Transmitter 19 Demodulator 210, 310 Control unit 230 Communication unit 330 Communication unit

Claims (10)

In a plurality of digital modulation schemes that can be supported by the communication device, storage means that stores values corresponding to signal points in the signal space diagram of each digital modulation scheme in association with bit strings corresponding to the signal points;
Based on the value stored in the storage means, in the signal space diagram, among signal points in the first digital modulation system, corresponding to signal points overlapping with signal points in the second digital modulation system Control means for deriving a conversion rule for mutually converting a bit string and a bit string corresponding to a signal point overlapping with the signal point in the second digital modulation scheme;
Providing means for providing the communication device with the conversion rule derived by the control means;
A conversion rule derivation device characterized by comprising: A value corresponding to a signal point in the signal space diagram of each digital modulation method is stored in the storage unit in an area having a corresponding bit string as a memory address.
The conversion rule deriving device according to claim 1. The control means is based on whether or not values are equal to each other in bit strings corresponding to signal points overlapping each other in the signal space diagram in the first digital modulation scheme and the second digital modulation scheme. , Derive transformation rules,
The conversion rule deriving device according to claim 1 or 2. The control means includes a bit string corresponding to each of overlapping signal points in the signal space diagram in the first digital modulation scheme and the second digital modulation scheme, in one bit string and in the other bit string. Deriving a conversion rule that applies a digit value in one bit string to a digit in the other bit string if there are digits in the bit and values that are equal to each other;
The conversion rule derivation device according to claim 3. The control means includes a bit string corresponding to each of overlapping signal points in the signal space diagram in the first digital modulation scheme and the second digital modulation scheme, in one bit string and in the other bit string. When there are digits whose values are not equal to each other, a conversion rule for deriving a combination of predetermined values corresponding to the combination of the values of the digits in one bit string is derived.
The conversion rule deriving device according to claim 3 or 4. Based on the signal arrangement in the signal space diagram, the bit string corresponding to the value of each signal point of the first digital modulation method and the value of each signal point in the second digital modulation method overlapping each signal point Data conversion means for converting transmission data according to the first digital modulation scheme into post-conversion data according to the second digital modulation scheme based on a conversion rule for mutually converting bit strings;
Modulation means for modulating the converted data by the second digital modulation method to generate a transmission signal;
Transmitting means for transmitting the transmission signal;
A communication apparatus comprising: A conversion rule deriving device for deriving the conversion rule;
The communication apparatus according to claim 6. Demodulation means for demodulating the received transmission signal into post-conversion data in a demodulation scheme according to the transmission signal;
Based on the signal arrangement in the signal space diagram, the bit string corresponding to the value of each signal point of the first digital modulation method and the value of each signal point in the second digital modulation method overlapping each signal point Data conversion means for converting the converted data according to the second digital modulation scheme into data for transmission according to the first digital modulation scheme, based on a conversion rule for mutually converting bit strings;
A communication apparatus comprising: A conversion rule deriving device for deriving the conversion rule;
The communication apparatus according to claim 8. In a plurality of digital modulation schemes that can be supported by the communication apparatus, values corresponding to signal points in the signal space diagram of each digital modulation scheme are stored in a storage unit that is stored in association with a bit string corresponding to the signal points. In the signal space diagram, a bit string corresponding to a signal point overlapping with a signal point in the second digital modulation method among the signal points in the first digital modulation method in the signal space diagram, Deriving a conversion rule for mutually converting the signal point and the bit string corresponding to the overlapping signal point in the digital modulation system of
Providing the derived conversion rule to the communication device;
A conversion rule derivation and provision method characterized by the above.

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