Wireless communication device, wireless communication method, control circuit, and storage medium

Abstract

The present invention provides a wireless transmitter (1) that is a wireless communication device in which a circuit constituting a baseband section (10) for generating transmission data and a circuit constituting a wireless section (15) for transmitting a wireless signal are connected by alternating current coupling. The baseband section (10) comprises a bit pattern conversion unit (13) that converts each bit constituting the transmission data into a bit pattern which enables an original bit to be restored even when a direct current component of a signal has been cut by the alternating current coupling.

Description

Wireless communication device, wireless communication method, control circuit, and storage medium

[0001] The present disclosure relates to a wireless communication device, a wireless communication method, a control circuit, and a storage medium.

[0002] As a technology for wirelessly converting part of a wired signal section, Patent Document 1 discloses a technology for converting wired signals such as Ethernet (registered trademark) into a bit pattern such as 4B5B to make it easier to recover the clock on the receiving side, and then transmitting it wirelessly.

[0003] U.S. Pat. No. 10,812,631

[0004] Although not described in Patent Document 1, it is generally considered effective to connect a circuit that performs bit pattern conversion or the like to generate a transmission signal and a radio circuit that performs up-conversion or the like on the transmission signal and transmits it as a radio signal by alternating current coupling (hereinafter referred to as AC (Alternating Current) coupling) in order to protect and simplify the device.

[0005] However, when AC coupling is used, direct current components (hereinafter referred to as DC (Direct Current) components) are cut, which can make data transmission difficult. For example, Patent Document 1 describes using ASK (Amplitude Shift Keying) modulated signals for signals transmitted between a transmitter and a receiver. ASK modulation transmits information by expressing 1 and 0 in signal amplitude, but when the DC component is cut, '1' and '0' become '0.5' and '-0.5', respectively, and since both have an amplitude of '0.5', the receiving side cannot distinguish between them.

[0006] The present disclosure has been made in consideration of the above, and aims to obtain a wireless communication device that enables normal data transmission even when a circuit that performs bit processing and a circuit that performs transmission processing of wireless signals are connected by AC coupling.

[0007] In order to solve the above-mentioned problems and achieve the objectives, the present disclosure provides a wireless communication device in which a circuit constituting a baseband unit that generates transmission data and a circuit constituting a radio unit that transmits radio signals are connected by AC coupling, and the baseband unit is characterized by comprising a bit pattern conversion unit that converts each bit constituting the transmission data into a bit pattern that allows the original bit to be restored even when the DC component of the signal is cut by AC coupling.

[0008] The wireless communication device according to the present disclosure has the advantage of being able to transmit data normally even when a circuit that performs bit processing and a circuit that performs transmission processing of a wireless signal are connected by AC coupling.

[0009] FIG. 1 is a diagram showing a configuration example of a communication system including a wireless communication device according to a first embodiment; FIG. 2 is a diagram showing a configuration example of a bit pattern conversion unit included in a wireless transmitter according to the first embodiment; FIG. 3 is a flowchart showing an example of a data transmission operation by a wireless transmitter according to the first embodiment; FIG. 4 is a diagram showing a configuration example of a communication system including a wireless communication device according to a second embodiment; FIG. 5 is a diagram showing a configuration example of a bit pattern conversion unit included in a wireless transmitter according to the second embodiment;

[0010] Hereinafter, a wireless communication device, a wireless communication method, a control circuit, and a storage medium according to embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0011] First Embodiment Fig. 1 is a diagram showing an example of the configuration of a communication system 100 including a wireless communication device according to a first embodiment.

[0012] The communication system 100 includes a wireless transmitter 1, which is a wireless communication device according to this embodiment, and a wireless receiver 2 that receives a wireless signal transmitted from the wireless transmitter 1. In this embodiment, the wireless transmitter 1 transmits to the wireless receiver 2 an ASK-modulated signal obtained by ASK-modulating transmission data.

[0013] The wireless transmitter 1 includes a wired signal receiving unit 11, a packet conversion unit 12, a bit pattern conversion unit 13, a high-speed serial interface (I / F) unit 14, and a wireless transmission unit 16. The wired signal receiving unit 11, the packet conversion unit 12, the bit pattern conversion unit 13, and the high-speed serial interface unit 14 constitute a baseband unit 10, and the wireless transmission unit 16 constitutes a wireless unit 15. The circuit that constitutes the baseband unit 10 and the circuit that constitutes the wireless unit 15 are connected by AC coupling.

[0014] The wired signal receiving unit 11 receives a wired signal. The wired signal receiving unit 11 performs wired communication with another device (not shown) in accordance with a communication method such as Ethernet (registered trademark), RS-232C, RS-422, or RS-485. The wired signal receiving unit 11 generates demodulated data of the wired signal received from the other device and outputs a bit string of the generated demodulated data to the packet conversion unit 12.

[0015] The packet conversion unit 12 packetizes the bit string input from the wired signal receiving unit 11. The packet conversion unit 12 divides the continuously input bit string into bit strings of a predetermined size and generates packets by adding, for example, a preamble for synchronization and a CRC (Cyclic Redundancy Check) for error checking to each of the divided bit strings. The packet conversion unit 12 outputs the packetized bit string to the bit pattern conversion unit 13.

[0016] The bit pattern conversion unit 13 converts each bit of the bit string input from the packet conversion unit 12 into a predetermined bit pattern. The bit pattern conversion unit 13 converts the bit string into a bit pattern that enables the wireless receiver 2 to receive the original bit string, i.e., enables the restoration of the bit string before it was converted into a bit pattern, even when the DC component is cut by the AC coupling that connects the baseband unit 10 and the wireless unit 15.

[0017] Specifically, when sending a '1', the bit pattern conversion unit 13 outputs an alternating pattern such as '1010...', '11001100...', '111000111000...', etc. The alternating pattern is a bit pattern in which one or more consecutive '1's and '0's are alternately linked, and the number of consecutive '1's and the number of consecutive '0's are the same. The total number of bits in the bit pattern after the transmission data '1' is converted is set to a first number, and the number of consecutive '1's and the number of consecutive '0's in this bit pattern are set to a second number. In other words, the bit pattern conversion unit 13 converts the transmission data '1' into a bit pattern in which a bit string in which a second number of consecutive bits indicating '1's and a bit string in which a second number of consecutive bits indicating '0's are alternately linked, and the total number of bits is the first number.

[0018] Furthermore, when sending '0', bit pattern conversion unit 13 outputs a bit pattern of all 0's, such as '0000...'. The length of the bit pattern output by bit pattern conversion unit 13 when sending '0' is the same as the length of the bit pattern output by bit pattern conversion unit 13 when sending '1'. In other words, bit pattern conversion unit 13 converts transmission data '0' into a bit pattern in which the first number of bits representing '0' continue.

[0019] The conversion process to a bit pattern by the bit pattern conversion unit 13 can be realized by creating a table of predetermined bit pattern conversions and reading them out from the table according to the input pattern. The length of the converted bit pattern (corresponding to the first number described above) is determined by the bit rate of the input signal to the bit pattern conversion unit 13, which is the bit rate of the signal that the wireless transmitter 1 wants to send to the wireless receiver 2, and the bit rate of the output signal from the high-speed serial interface unit 14 to the wireless transmission unit 16. By performing the above-mentioned conversion by the bit pattern conversion unit 13, the wireless receiver 2 on the data receiving side can obtain received data by performing envelope detection, which is a general asynchronous detection that demodulates an ASK-modulated signal.

[0020] FIG. 2 is a diagram illustrating an example of the configuration of the bit pattern conversion unit 13 included in the wireless transmitter 1 according to the first embodiment.

[0021] 2, the bit pattern conversion unit 13 has an ASK bit pattern conversion table 31. The bit pattern conversion unit 13 converts each bit of the input bit string 51 into a bit pattern in accordance with the ASK bit pattern conversion table 31, and outputs the bit string 52. In FIG. 2, an example is shown in which the transmission rate of the high-speed serial interface unit 14 is set to 4 Gbps and the bit rate of the signal to be transmitted is set to 1 Gbps.

[0022] 2, the bit pattern conversion unit 13 converts a '1' to '1010' when it wants to send a '1', and converts a '0' to '0000' when it wants to send a '0'. That is, when a '1' is input, the bit pattern conversion unit 13 converts it to '1010' and outputs it to the high-speed serial interface unit 14, and when a '0' is input, it converts it to '0000' and outputs it to the high-speed serial interface unit 14.

[0023] The high-speed serial interface unit 14 outputs the bit string received from the bit pattern conversion unit 13 to the radio transmission unit 16 as an I (Inphase) ch or Q (Quadrature) ch signal.

[0024] A bit conversion method different from the example shown in Fig. 2 is shown in Fig. 3. Fig. 3 is a diagram showing another example of the operation of the bit pattern conversion unit 13 included in the wireless transmitter 1 according to the first embodiment.

[0025] The bit pattern conversion unit 13 may execute the bit conversion process 53 shown in Fig. 3. In the example shown in Fig. 3, similar to the example described using Fig. 2, the transmission rate of the high-speed serial interface unit 14 is set to 4 Gbps, and the bit rate of the signal to be transmitted is set to 1 Gbps.

[0026] 3, the bit pattern conversion unit 13 converts a '1' to '1100' when it wants to send it, and converts a '0' to '0000' when it wants to send it. In this example, signal information exists at the frequency of the bit pattern '1100' after converting '1' (the frequency of the alternating pattern, ±1 GHz in this example), so the wireless receiver 2 performs demodulation in synchronization with a frequency of ±1 GHz of the carrier frequency. The frequency of the alternating pattern (whether to use the above '1010' or '1100') is determined taking into consideration the input bandwidth that the hardware (e.g., integrated circuit) constituting the wireless unit 15 can handle, the bit rate of the signal to be transmitted, the setting range of the transmission rate that the high-speed serial interface unit 14 can handle, etc.

[0027] By performing the conversion as described using Figures 2 and 3 using the bit pattern conversion unit 13, the modulation components of the signal are generated at positions centered on DC and the bit pattern frequency, and even if the DC component is cut off by AC coupling, the wireless receiver 2 can demodulate the information without losing it by synchronizing with the bit pattern frequency.

[0028] The wireless transmitting unit 16 converts the bit pattern (Ich signal or Qch signal) output from the bit pattern converting unit 13 and input by AC coupling via the high-speed serial interface unit 14 into an RF (Radio Frequency) signal by up-converting it to a predetermined frequency, and transmits it from an antenna, etc. If the signal transmission spectrum becomes wider and interference with surrounding wireless systems becomes a problem, an arbitrary band-limiting filter, etc. may be provided before or after conversion to an RF signal.

[0029] The above-described operation of the wireless transmitter 1 is shown in a flowchart in Fig. 4. Fig. 4 is a flowchart showing an example of a data transmission operation by the wireless transmitter 1 according to the first embodiment.

[0030] 4, the wireless transmitter 1 first acquires transmission data (step S11). Specifically, the wired signal receiving unit 11 receives a wired signal and performs demodulation processing to acquire the transmission data contained in the wired signal. The wired signal receiving unit 11 outputs the acquired transmission data to the packet conversion unit 12.

[0031] Next, the wireless transmitter 1 packetizes the transmission data (step S12). Specifically, the packet conversion unit 12 packetizes the transmission data input from the wired signal receiving unit 11. The packet conversion unit 12 outputs the packetized transmission data to the bit pattern conversion unit 13.

[0032] The wireless transmitter 1 then converts the bit pattern of the packetized transmission data (step S13). Specifically, the bit pattern conversion unit 13 converts each bit of the packetized transmission data input from the packet conversion unit 12 into a predetermined bit pattern. The bit pattern conversion unit 13 outputs the bit pattern converted transmission data to the wireless transmission unit 16 via the high-speed serial interface unit 14.

[0033] The wireless transmitter 1 then converts the bit-pattern-converted transmission data into a wireless signal and transmits it (step S14). Specifically, the wireless transmitting unit 16 converts the bit-pattern-converted transmission data input from the bit-pattern converting unit 13 into a signal in the wireless frequency band, and transmits the signal as a wireless signal from the antenna.

[0034] 1 , the wireless receiver 2 includes a wired signal transmitting unit 21, a packet converting unit 22, a high-speed serial interface unit 23, a detecting unit 25, and a wireless receiving unit 26. The wired signal transmitting unit 21, the packet converting unit 22, and the high-speed serial interface unit 23 constitute a baseband unit 20, and the detecting unit 25 and the wireless receiving unit 26 constitute a wireless unit 24. The wireless receiver 2 is a general receiving device that receives wireless signals, and performs general demodulation processing on the received signal to restore the data transmitted from the wireless transmitter 1.

[0035] The high-speed serial interface unit 23 of the baseband unit 20 and the detection unit 25 of the radio unit 24 are connected by AC coupling.

[0036] The radio receiving section 26 performs down-conversion and the like on the RF signal transmitted from the radio transmitter 1 and received by an antenna or the like, and outputs the result to the detection section 25 .

[0037] The detector 25 performs envelope detection on the signal output by the wireless receiver 26, restores a bit string similar to the bit string output by the packet converter 12 of the wireless transmitter 1, and outputs it to the high-speed serial interface 23.

[0038] The high-speed serial interface unit 23 receives the bit string output by the detector unit 25 and passes it to the packet converter unit 22 .

[0039] The packet conversion unit 22 extracts an information sequence from the packetized bit string input from the high-speed serial interface unit 23 and outputs it to the wired signal transmission unit 21 .

[0040] When the wired signal transmitting unit 21 receives the information sequence from the packet converting unit 22, it generates a wired signal by converting it into a signal of a predetermined format, and transmits it to other equipment (not shown).

[0041] As described above, in the communication system 100 according to this embodiment, the wireless transmitter 1 includes the bit pattern conversion unit 13 that converts each bit of the bit sequence constituting the transmission data into a bit pattern that enables the original bit sequence to be determined even if the DC component is cut off when the data passes through an AC-coupled section. This enables normal data transmission even if the circuit constituting the baseband unit 10 that performs bit processing and the circuit constituting the radio unit 15 that performs transmission processing of the radio signal are configured to be AC-coupled.

[0042] Second Embodiment Fig. 5 is a diagram showing a configuration example of a communication system 100a including a wireless communication device according to a second embodiment. In Fig. 5, the same components as those in the communication system 100 according to the first embodiment shown in Fig. 1 are denoted by the same reference numerals. Therefore, a description of the components denoted by the same reference numerals as those in the communication system 100 will be omitted.

[0043] In the first embodiment, a communication system 100 has been described in which a wireless transmitter 1 ASK-modulates transmission data and transmits the data to a wireless receiver 2. However, since the ASK modulation method is generally vulnerable to propagation path fluctuations such as fading, it may be desirable to use an FSK (Frequency Shift Keying) modulation method, which is more resistant to propagation path fluctuations. Therefore, in this embodiment, a communication system 100a will be described which transmits an FSK-modulated signal obtained by FSK-modulating transmission data.

[0044] As shown in FIG. 5, a communication system 100a includes a wireless transmitter 1a which is a wireless communication device according to the second embodiment, and a wireless receiver 2 which receives a wireless signal transmitted from the wireless transmitter 1a.

[0045] The wireless transmitter 1a has a configuration in which the bit pattern conversion unit 13 of the wireless transmitter 1 according to the first embodiment is replaced with a bit pattern conversion unit 13a. The wired signal receiving unit 11, packet conversion unit 12, bit pattern conversion unit 13a, and high-speed serial interface unit 14 constitute a baseband unit 10a. The high-speed serial interface unit 14 of the baseband unit 10a and the wireless transmitting unit 16 of the wireless unit 15 are connected by AC coupling.

[0046] The bit pattern converter 13a performs a conversion process on each bit of the bit string output from the packet converter 12, which is different from the conversion process performed by the bit pattern converter 13 of the wireless transmitter 1 according to the first embodiment.

[0047] FIG. 6 is a diagram illustrating an example of the configuration of a bit pattern conversion unit 13a included in a wireless transmitter 1a according to the second embodiment.

[0048] As shown in Fig. 6, the bit pattern conversion unit 13a includes a phase calculation unit 32 and a serial-parallel (S / P) conversion unit 33, converts each bit of an input bit string 61 into a predetermined bit pattern, and outputs a bit string 62 as an Ich signal and a Qch signal. Fig. 6 shows an example in which the transmission rate of the high-speed serial interface unit 14 is set to 4 Gbps and the bit rate of the signal to be sent is 2 Gbps.

[0049] The phase calculation unit 32 calculates the phase values ​​θ(i)={π / 4, 3π / 4, 5π / 4, 7π / 4} in units of π / 2, which are the phase information of the transmission signal, based on the input bit pattern b(t)={0, 1} and the oversampling rate P (the ratio between the set value of the transmission rate of the high-speed serial interface unit 14 and the bit rate of the signal to be actually transmitted). The phase calculation unit 32 assigns 2 bits to the four determined phase values ​​θ(i) and calculates θ out (i)={11, 01, 00, 10} to the S / P conversion unit 33. That is, when the phase value θ(i)=π / 4, the phase calculation unit 32 outputs θ out (i)=11 is output to the S / P converter 33, and when the phase value θ(i)=3π / 4, θ out (i)=01 to the S / P converter 33, and when the phase value θ(i)=5π / 4, θ out (i)=00 is output to the S / P conversion unit 33, and when the phase value θ(i)=7π / 4, θ out (i)=10 is output to the S / P conversion unit 33 .

[0050] The process of determining the phase value θ(i) by the phase calculation unit 32 can be expressed by the following equation (1).

[0051]

[0052] The S / P converter 33 converts the 2-bit serial data output from the phase calculator 32 into parallel data, and outputs the converted data (2-bit parallel data) as an Ich signal and a Qch signal.

[0053] In the example shown in Fig. 6, the oversampling rate P = 2. The bit pattern b(t) input to the phase calculation unit 32 is [1, 0, 0, 1], and the transition of the phase value θ(i) at this time is shown in Fig. 7. Fig. 7 is a diagram showing an example of the transition of the phase value calculated by the phase calculation unit 32 of the wireless transmitter 1a according to the second embodiment.

[0054] When the phase value θ(i) transitions as shown in FIG. 7, the output θ of the phase calculation unit 32 out (i) becomes [11, 01, 00, 01, 11, 10, 00, 10]. Then, the S / P conversion unit 33 outputs a bit string 62.

[0055] In this way, the bit pattern conversion unit 13a converts each bit of the bit sequence constituting the transmission data into a 2-bit bit pattern based on the bit value and the oversampling rate P, which is the ratio between the transmission rate of the high-speed serial interface unit 14 and the bit rate of the transmission data, and outputs each bit as an Ich signal and a Qch signal. As a result, even if the DC component is cut from the output signal of the baseband unit 10a by the AC coupling connecting the baseband unit 10a and the radio unit 15, the radio receiver 2 on the data receiving side can obtain the received data by performing discriminator detection, which is a general asynchronous detection that demodulates an FSK modulated signal.

[0056] The constellation of the signal output from the baseband unit 10a of the wireless transmitter 1a according to this embodiment is the one shown in Fig. 8, i.e., a constellation having a DC offset. Fig. 8 is a diagram showing an example of the constellation of the signal output from the baseband unit 10a of the wireless transmitter 1a according to the second embodiment.

[0057] The DC component of the signal output from the baseband unit 10a is cut by AC coupling connecting the baseband unit 10a and the radio unit 15, and the constellation at the time of input to the radio unit 15 is as shown in Fig. 9. Fig. 9 is a diagram showing an example of the constellation of the signal input to the radio unit 15 of the radio transmitter 1a according to the second embodiment. As shown in Fig. 9, the signal input to the radio unit 15 does not have a DC component. This makes it possible for the receiving side (radio receiver 2) to correctly determine the signal point and obtain the original bit string.

[0058] As described above, the wireless transmitter 1a according to this embodiment can transmit data normally even when the baseband unit 10a and the wireless unit 15 are connected by AC coupling. Furthermore, the bit pattern conversion unit 13a determines four-valued phase information based on the input bit pattern and the oversampling rate P and converts this into binary I and Q signals, making it possible to transmit data correctly even in an environment with severe propagation path fluctuations, thereby achieving high-quality communications.

[0059] Next, a description will be given of the hardware configuration of the wireless transmitter 1 according to the first embodiment and the wireless transmitter 1a according to the second embodiment. Since the hardware configuration of the wireless transmitter 1 is similar to that of the wireless transmitter 1a, the hardware configuration of the wireless transmitter 1 will be described here.

[0060] The radio section 15 of the radio transmitter 1 is realized by, for example, a transceiver.

[0061] The baseband unit 10 of the wireless transmitter 1 is realized by, for example, a receiving circuit, a serial interface, and a processing circuit. Specifically, the wired signal receiving unit 11 of the baseband unit 10 is realized by a receiving circuit, and the high-speed serial interface unit 14 is realized by a serial interface. The packet conversion unit 12 and bit pattern conversion unit 13 of the baseband unit 10 are realized by a processing circuit.

[0062] The processing circuitry that realizes the packet conversion unit 12 and the bit pattern conversion unit 13 may be a processor and memory that executes a program stored in a memory, or may be dedicated hardware. The processing circuitry is also called a control circuitry.

[0063] FIG. 10 is a diagram illustrating an example of a processing circuit that realizes the packet conversion unit 12 and the bit pattern conversion unit 13 that constitute the baseband unit 10 of the wireless transmitter 1 according to the first embodiment. FIG. 10 illustrates an example of a processing circuit 90 in which the packet conversion unit 12 and the bit pattern conversion unit 13 are realized by a processor 91 and a memory 92. The processing circuit 90 illustrated in FIG. 10 includes the processor 91 and the memory 92. Each function of the processing circuit 90 is realized by software, firmware, or a combination of software and firmware. The software or firmware is written as a program and stored in the memory 92. The processing circuit 90 realizes each function by having the processor 91 read and execute the program stored in the memory 92. That is, the processing circuit 90 includes the memory 92 for storing a program that results in the processing of the packet conversion unit 12 and the bit pattern conversion unit 13 that constitute the baseband unit 10 of the wireless transmitter 1. This program can also be said to be a program that causes the wireless transmitter 1 to execute each function realized by the processing circuit 90. This program may be provided by a storage medium on which the program is stored, or may be provided by other means such as a communication medium.

[0064] The processor 91 is, for example, a central processing unit (CPU), a processing device, an arithmetic unit, a microprocessor, a microcomputer, or a digital signal processor (DSP). The memory 92 is, for example, a non-volatile or volatile semiconductor memory such as a random access memory (RAM), a read only memory (ROM), a flash memory, an erasable programmable read only memory (EPROM), or an electrically programmable programmable read only memory (EEPROM).

[0065] FIG. 11 illustrates another example of a processing circuit that implements the packet conversion unit 12 and the bit pattern conversion unit 13 that constitute the baseband unit 10 of the wireless transmitter 1 according to the first embodiment. FIG. 11 illustrates an example of a processing circuit 93 in which the packet conversion unit 12 and the bit pattern conversion unit 13 are implemented using dedicated hardware. The processing circuit 93 illustrated in FIG. 11 may be implemented, for example, as a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or a combination thereof. The processing circuit may be partially implemented using dedicated hardware and partially implemented using software or firmware. In this manner, the processing circuit can implement the above-described functions using dedicated hardware, software, firmware, or a combination thereof. The processing circuit 93 may also be configured to include a serial interface. In this case, the high-speed serial interface unit 14 of the baseband unit 10 may be implemented using the processing circuit 93.

[0066] The configurations shown in the above embodiments are merely examples, and may be combined with other known technologies, or different embodiments may be combined with each other. It is also possible to omit or modify parts of the configurations as long as they do not deviate from the gist of the invention.

[0067] 1, 1a Wireless transmitter, 2 Wireless receiver, 10, 10a, 20 Baseband unit, 11 Wired signal receiving unit, 12, 22 Packet conversion unit, 13, 13a Bit pattern conversion unit, 14, 23 High-speed serial interface unit, 15, 24 Wireless unit, 16 Wireless transmitting unit, 21 Wired signal transmitting unit, 25 Detection unit, 26 Wireless receiving unit, 31 ASK bit pattern conversion table, 32 Phase calculation unit, 33 Serial-to-parallel conversion unit, 100, 100a Communication system.

Claims

1. A wireless communication device in which a circuit constituting a baseband unit for generating transmission data and a circuit constituting a radio unit for transmitting a radio signal are connected by AC coupling, wherein the baseband unit includes a bit pattern conversion unit that converts each bit constituting the transmission data into a bit pattern that can restore the original bit even when the DC component of the signal is cut off by the AC coupling. The wireless communication device is characterized by this.

2. The bit pattern conversion unit converts a bit indicating 0 into a bit pattern in which bits indicating 0 continue for a first number of bits determined, and for a bit indicating 1, a bit sequence in which bits indicating 1 continue for a second number of bits and a bit sequence in which bits indicating 0 continue for the second number of bits are alternately arranged, and the total number of bits is converted into a bit pattern of the first number of bits. The wireless communication device according to claim 1 is characterized by this.

3. The bit pattern conversion unit converts each bit constituting the transmission data into a 2-bit bit pattern based on the bit value, the transmission rate from the baseband unit to the radio unit, and the bit rate of the transmission data. The wireless communication device according to claim 1 is characterized by this.

4. A wireless communication method in which a wireless communication device in which a circuit constituting a baseband unit for generating transmission data and a circuit constituting a radio unit for transmitting a radio signal are connected by AC coupling transmits a signal, wherein the baseband unit performs a bit pattern conversion step of converting each bit constituting the transmission data into a bit pattern that can restore the original bit even when the DC component of the signal is cut off by the AC coupling and outputting it to the radio unit, and the radio unit performs a wireless transmission step of converting the bit pattern into a signal in a radio frequency band and transmitting it. The wireless communication method is characterized by including this.

5. A control circuit for controlling a wireless communication device in which a circuit constituting a baseband unit for generating transmission data and a circuit constituting a wireless unit for transmitting a wireless signal are connected by AC coupling, wherein the baseband unit converts each bit constituting the transmission data into a bit pattern capable of restoring the original bit even when the DC component of the signal is cut by the AC coupling and outputs the bit pattern to the wireless unit; and the wireless unit converts the bit pattern into a signal in a radio frequency band and transmits the signal. A control circuit characterized by causing the wireless communication device to execute the above steps.

6. A storage medium storing a program for controlling a wireless communication device in which a circuit constituting a baseband unit for generating transmission data and a circuit constituting a wireless unit for transmitting a wireless signal are connected by AC coupling, wherein the program causes the baseband unit to convert each bit constituting the transmission data into a bit pattern capable of restoring the original bit even when the DC component of the signal is cut by the AC coupling and output the bit pattern to the wireless unit; and the wireless unit converts the bit pattern into a signal in a radio frequency band and transmits the signal. A storage medium characterized by causing the wireless communication device to execute the above steps.

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