JP2009246764A - Transmitter, transmission method, receiver, reception method, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform reliable radio communications with a simpler configuration. <P>SOLUTION: In the modulation system of a transmission processing section 101, the number of signal points is larger than that of demodulation points in a receiver, namely a transmission destination. For example, the modulation system of the transmission processing section 101 is 16QAM and the demodulation system of the receiver is BPSK. Although the transmission processing section 101 modulates transmission data supplied from a signal processing section 103 by 16QAM for transmission, the signal point, which is decided by learning and has the lowest error rate in the receiver, is adopted as a transmission signal point at this point. The present invention can be applied, for example, to a communication device performing radio communications via a communication path having steady phase characteristics. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a transmission device, a transmission method, a reception device, a reception method, and a program, and in particular, a transmission device, a transmission method, and a reception device that can perform highly reliable wireless communication with a simpler configuration. , A receiving method, and a program.

  Conventionally, for example, a CRT (Cathode Ray Tube) or LCD (Liquid Crystal Display) is applied to image signals from external devices such as tuners that receive television broadcast signals and DVD (Digital Versatile Disc) players. There is a signal processing device that supplies an image signal to a display device.

  In such a signal processing device, a noise removal process for removing noise from an image signal supplied from an external device, or an image displayed on a display device with higher image quality than an image from the external device. Signal processing such as image conversion processing for converting a signal and image adjustment processing for adjusting the brightness and contrast of an image displayed on the display device is performed.

  FIG. 1 is a block diagram showing a configuration of an example of a conventional signal processing apparatus.

In FIG. 1, a signal processing apparatus 11 includes a housing 12, connectors 13 ₁ to 13 ₄ , an input selector 14, a signal router 15, connectors 16 ₁ to 16 ₄ , connectors 17 ₁ to 17 ₃ , and functional blocks 18 ₁ to 18 _3. , Connector 19, remote commander 20, operation unit 21, system control block 22, and control bus 23.

In the signal processing device 11, the connectors 13 ₁ to 13 ₄ are connected to the input selector 14 via a signal cable, and the input selector 14 is connected to the signal router 15 via the signal cable. The signal router 15 is connected to the connectors 16 ₁ to 16 ₄ and the connector 19 via signal cables, and further to the function block 18 ₁ via the connectors 16 ₁ to 16 ₃ and the connectors 17 ₁ to 17 _3. not to have been connected to the 18 _3. The input selector 14, the signal router 15, the connectors 16 ₁ to 16 ₄ , and the system control block 22 are connected to each other via a control bus 23.

The housing 12 is, for example, a rectangular parallelepiped metal housing, and includes an input selector 14, a signal router 15, connectors 16 ₁ to 16 ₄ , connectors 17 ₁ to 17 ₃ , and functional blocks 18 ₁ to 18. 18 ₃ , a system control block 22, a control bus 23, and the like are accommodated.

Further, the housing 12 is provided with connectors 13 ₁ to 13 ₄ , 19 and an operation unit 21 so as to be exposed to the outside.

Connected to the connectors 13 ₁ to 13 ₄ are cables for connecting the signal processing device 11 and an external device (not shown) such as a tuner or a DVD player for supplying image signals to the signal processing device 11.

The input selector 14 is supplied with an image signal from an external device via the connectors 13 ₁ to 13 ₄ . The input selector 14 selects an image signal supplied from the connectors 13 ₁ to 13 ₄ according to the control of the system control block 22 and supplies it to the signal router 15.

The signal router 15 supplies the signal supplied from the input selector 14 to the function block 18 _i via the connectors 16 _i and 17 _i under the control of the system control block 22 (i = 1, 2 in FIG. 1). , 3).

The signal router 15 is supplied with signals subjected to signal processing from the function block 18 _i via connectors 17 _i and 16 _i . The signal router 15 supplies the signal from the functional block 18 _i to the display device (not shown) connected to the connector 19 via the connector 19.

The connectors 16 _i and 17 _i are detachable from each other, and connect the signal router 15 and the control bus 23 to the functional block 18 _i .

In FIG. 1, four connectors 16 ₁ to 16 ₄ are provided in the housing 12, and three connectors 16 ₁ to 16 ₃ are connected to the connectors 17 ₁ to 17 of the functional blocks 18 ₁ to 18 _3. 17 ₃ are connected to each other. In Figure 1, nothing in the connector 16 ₄ which is not connected, it is possible to connect a new function block (connector) to be added to the signal processor 11.

Each of the functional blocks 18 ₁ to 18 ₃ has a signal processing circuit that performs signal processing such as noise removal processing, image conversion processing, or image adjustment processing. The functional blocks 18 ₁ to 18 ₃ perform signal processing on the signal supplied from the signal router 15, and supply the signal subjected to signal processing to the signal router 15.

  The connector 19 is connected to a cable that connects the signal processing device 11 and a display device that displays an image output from the signal processing device 11.

  The remote commander 20 includes a plurality of buttons operated by the user and supplies (transmits) an operation signal corresponding to the user's operation to the system control block 22 using infrared rays or the like. To do.

  Similar to the remote commander 20, the operation unit 21 includes a plurality of buttons operated by the user, and is operated by the user, and supplies an operation signal corresponding to the user operation to the system control block 22.

When an operation signal corresponding to a user operation is supplied from the remote commander 20 or the operation unit 21, the system control block 22 is input via the control bus 23 so that processing according to the operation signal is performed. The selector 14, the signal router 15, or the function blocks 18 ₁ to 18 ₃ are controlled.

In the signal processing apparatus 11 configured as described above, an image signal is supplied to the signal router 15 via the connectors 13 ₁ to 13 ₄ and the input selector 14, and the signal router 15 and the functional blocks 18 ₁ to 18 ₃ are connected. In between, an image signal is transmitted (transmitted) via a signal cable.

By the way, in recent years, as the image becomes higher in definition, the signal capacity of the image subjected to signal processing by the signal processing device 11 tends to increase. When the capacity of the image signal increases, for example, the image signal is transmitted between the signal router 15 and the functional blocks 18 ₁ to 18 ₃ or between the functional blocks 18 ₁ to 18 ₃ via the signal cable. It is transmitted at high speed. As described above, when a signal is transmitted at a high speed, a problem occurs in signal transmission due to the influence of the frequency characteristics of the signal cable, crosstalk, timing shift (skew) occurring in the parallel signal cable, and the like.

  Therefore, there is a method of transmitting signals by wireless communication. For example, there is a signal processing device that performs wireless communication using radio waves, and a wireless communication system that performs wireless communication within a housing of an industrial information processing device (see, for example, Patent Document 1).

  In wireless communication, the receiving side must oscillate the carrier signal in synchronism with the carrier signal of the received signal, which is also a difficult point for performing accurate communication in wireless communication. In general, delay detection that synchronizes the frequency and phase of an oscillation signal from a received radio wave is widely employed as a method of synchronizing with a carrier signal of a received signal.

JP 2003-179821 A

  However, when wireless communication is performed within the housing of the signal processing device 11 of FIG. 1, the received signal is severely distorted due to multiple reflections due to the wall surface of the housing 12 and internal structures. It becomes difficult.

  The present invention has been made in view of such a situation, and makes it possible to perform highly reliable wireless communication with a simpler configuration.

  According to a first aspect of the present invention, there is provided a transmitting device that modulates transmission data by a modulation method having a number of signal points greater than the number of demodulation points of the receiving device, and among the signal points of the modulating unit, Selection means for selecting a signal point with the lowest error rate, and transmission for transmitting the transmission data modulated by the modulation means at the signal point selected by the selection means via a communication path having a steady phase characteristic Means.

  A transmission method according to a first aspect of the present invention includes a modulation unit that modulates transmission data by a modulation scheme having a number of signal points larger than the number of demodulation points of the reception device, and a signal point included in the modulation unit. Selection means for selecting a signal point with the lowest error rate, and transmission for transmitting the transmission data modulated by the modulation means at the signal point selected by the selection means via a communication path having a steady phase characteristic A transmitting device comprising: means for selecting a signal point having the lowest error rate in the receiving device among signal points of the modulating means, and transmitting the transmission data modulated by the modulating means at the selected signal point, Transmission is performed via a communication path having a steady phase characteristic.

  According to a first aspect of the present invention, there is provided a program for receiving a computer from a modulation unit that modulates transmission data by a modulation method having a number of signal points greater than the number of demodulation points of a reception device, and among the signal points of the modulation unit. Selection means for selecting a signal point with the lowest error rate in the apparatus, and transmission means for transmitting the transmission data modulated by the modulation means at the selected signal point via a communication path having a steady phase characteristic Make it work.

  In the first aspect of the present invention, the signal point having the lowest error rate is selected in the receiving apparatus among the signal points of the modulation means, and the transmission data modulated by the modulation means at the selected signal point is the phase It is transmitted via a communication path whose characteristics are stationary.

  The receiving device according to the second aspect of the present invention includes a synchronizing means for establishing frequency synchronization with respect to a signal transmitted from a transmitting device and received via a communication path having a steady phase characteristic, and the received signal And demodulating means for demodulating the signal with a demodulation method having a signal number smaller than the signal number of the modulation method on the transmission side.

  The receiving method according to the second aspect of the present invention includes a synchronization unit that establishes frequency synchronization with respect to a signal transmitted from a transmission-side device and received via a communication path having a steady phase characteristic, and the received signal A receiving device including a demodulating means for demodulating a signal by a demodulation method having a signal number smaller than the signal number of the modulation method on the transmission side, via a communication path transmitted from the device on the transmission side and having a steady phase characteristic; Then, frequency synchronization is established with respect to the received signal, and the received signal is demodulated by a demodulation method having a smaller number of signal points than the signal number of the modulation method on the transmission side.

  The program according to the second aspect of the present invention includes a synchronization unit that establishes frequency synchronization with respect to a signal transmitted from an apparatus on the transmission side and received via a communication path having a steady phase characteristic. The received signal is caused to function as a demodulating means for demodulating the received signal with a demodulation system having a signal number smaller than that of the modulation system on the transmission side.

  In the second aspect of the present invention, frequency synchronization is established for a signal transmitted from a device on the transmission side and received via a communication path having a steady phase characteristic, and the received signal is transmitted to the transmission side. Demodulation is performed with a demodulation method having a smaller number of signal points than that of the modulation method.

  The transmission device and the reception device may be independent devices, or may be a block that performs transmission processing or reception processing.

  According to the first and second aspects of the present invention, highly reliable wireless communication can be performed with a simpler configuration.

  FIG. 2 is a perspective view showing a configuration example of an embodiment of a signal processing device to which the present invention is applied.

In FIG. 2, a signal processing device 31 includes a housing 32, a power supply module 33, a substrate (platform substrate) 34, a substrate (input substrate) 35, substrates (signal processing substrates) 36 ₁ to 36 ₃ , and a substrate (output substrate). 37.

Housing 32 is a metallic casing in a rectangular parallelepiped shape, the inside, the power module 33, platform board 34, input board 35, signal processing boards 36 ₁ through 36 _3, and output board 37 is housed Yes.

The power supply module 33 supplies power required for driving to the platform board 34, the input board 35, the signal processing boards 36 ₁ to 36 ₃ , and the output board 37.

Signal processing boards 36 ₁ to 36 ₃ are mounted on the platform board 34. Note that power is supplied to the signal processing boards 36 ₁ to 36 ₃ from the power supply module 33 via the platform board 34.

The input board 35 is connected to connectors 13 ₁ to 13 ₄ (FIG. 3) provided outside the housing 32, and an external device (see FIG. 3) connected to the input board 35 via the connector 13 _i . For example, an image signal is supplied from (not shown). Also, the input board 35 has an antenna 35a for wireless communication using radio waves, the signal of the image supplied from the external device, via the antenna 35a, the signal processing boards 36 ₁ through 36 ₃ Send (transmit).

The signal processing boards 36 ₁ to 36 ₃ are respectively provided with antennas 36a ₁ to 36a ₃ for performing wireless communication using radio waves. The signal processing board 36 _i, via the antenna 36a _i, the signal of the image is supplied transmitted from the input board 35. The signal processing board 36 _i performs signal processing such as noise removal processing, image conversion processing, or image adjustment processing on the image signal from the input board 35, and the signal signal subjected to the signal processing is transmitted to the antenna 36 a _i. To the output board 37.

The output board 37 includes an antenna 37a for performing wireless communication using radio waves, and is connected to a connector 19 (FIG. 3) provided on the housing 32. The output board 37 receives image signals transmitted from the signal processing boards 36 ₁ to 36 ₃ via the antenna 37 a and supplies them to a display device (not shown) connected to the connector 19.

  Next, FIG. 3 is a block diagram illustrating an electrical configuration example of the signal processing device 31 of FIG.

  In the figure, portions corresponding to those of the signal processing device 11 of FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted below as appropriate.

In FIG. 3, the signal processing device 31 includes connectors 13 ₁ to 13 ₄ , connector 19, remote commander 20, operation unit 21, casing 32, input selector 44, signal router 45, functional blocks 46 ₁ to 46 ₃ , system control. The block 50 is composed of a system synchronization signal oscillator 61 and a system synchronization signal line 62.

In the signal processing device 31, the connectors 13 ₁ to 13 ₄ are connected to an input selector 44 via a signal cable, and the input selector 44 is connected to a signal router 45 via a signal cable. Is connected to the connector 19 via a signal cable.

Inside the housing 32, an input selector 44, a signal router 45, functional blocks 46 ₁ to 46 ₃ , and a system control block 50 are housed.

  For example, the input selector 44 is provided on the input board 35 of FIG. 2, and wireless communication can be performed via an antenna 35 a provided on the input board 35.

The input selector 44 is supplied with an image signal from an external device (not shown) via the connectors 13 ₁ to 13 ₄ . The input selector 44 selects an image signal supplied from an external device connected to the connectors 13 ₁ to 13 ₄ according to the control of the system control block 50 and supplies it to the signal router 45.

  For example, the signal router 45 is provided on the output board 37 of FIG. 2, and wireless communication can be performed via an antenna 37 a provided on the output board 37.

Signal router 45 under the control of the system control block 50, a signal of the image supplied from the input selector 44 via the antenna 37a, by wireless communication using radio waves, and transmits to the functional blocks 46 ₁ through 46 _3.

The signal router 45 receives the image signal transmitted from the function blocks 46 ₁ to 46 ₃ through the antenna 37a by radio communication using radio waves, and receives the image signal from the function blocks 46 ₁ to 46 _3. Is supplied to a display device (not shown) connected to the connector 19 via the connector 19.

The functional blocks 46 ₁ to 46 ₃ are provided, for example, on the signal processing boards 36 ₁ to 36 ₃ in FIG. 2, respectively, via antennas 36a ₁ to 36a ₃ provided on the signal processing boards 36 ₁ to 36 _3. Wireless communication is possible.

The functional block 46 _i receives an image signal transmitted from the signal router 45 by radio communication using radio waves via the antenna 36 a _i, and performs noise removal processing and image conversion processing on the image signal. Or signal processing such as image adjustment processing. The functional block 46 _i transmits the signal of the image subjected to the signal processing to the signal router 45 through the antenna 36a _i by wireless communication using radio waves. Further, the function blocks 46 _i and 46 _{i ′} transmit and receive signals by wireless communication via the antennas 36 a _i and 36 a _{i ′} as necessary.

In the case the function block 46 is not necessary to distinguish between ₁ to each of the 46 ₃ individually hereinafter, referred to functional blocks 46 ₁ through 46 ₃ and the functional block 46. Similarly, the antennas 36a ₁ to 36a ₃ are also referred to as the antenna 36a.

  The system control block 50 is provided, for example, on the platform board 34 in FIG. 2, and wireless communication can be performed via an antenna 50a that is provided on the platform board 34 and is not shown in FIG. It has become.

  Further, an operation signal is supplied to the system control block 50 from the remote commander 20 and the operation unit 21.

  When an operation signal corresponding to a user's operation is supplied from the remote commander 20 or the operation unit 21, the system control block 50 transmits radio waves via the antenna 50a so that processing according to the operation signal is performed. The input selector 44, the signal router 45, and the functional block 46 are controlled by the used wireless communication.

  The system synchronization signal oscillator 61 generates a system reference signal, which is a clock signal serving as a reference for the entire signal processing device 31, via the system synchronization signal line 62, the input selector 44, the signal router 45, the functional block 46, and the system Supply to the control block 50.

  The frequency of the system reference signal is the same as the frequency of the system clock signal that determines the processing timing of the baseband signal. The input selector 44, the signal router 45, the function block 46, and the system control block 50 Operates based on. As a result, in the housing 32 of the signal processing device 31, the phase jitter and frequency of the operation reference signal (system clock signal) in each of the input selector 44, the signal router 45, the function block 46, and the system control block 50. Jitter can be minimized.

  A carrier signal when the input selector 44, the signal router 45, the function block 46, and the system control block 50 perform wireless communication is generated by multiplying the system reference signal. As a result, in the wireless communication within the housing 32 of the signal processing device 31, unlike the general mobile wireless communication system, the frequency synchronization of the carrier signal on the transmitting side and the receiving side shares the system reference signal. Has been established.

  Inside the housing 32 of the signal processing device 31 configured as described above, any one of the input selector 44, the signal router 45, the function block 46, and the system control block 50 is required as necessary. Becomes a transmission device, and at least one other block becomes a reception device, and the transmission device transmits, for example, an image signal, a control signal, and other signals by wireless communication using radio waves. Then, the receiving device receives a signal from the transmitting device.

  In wireless communication within the housing of the signal processing device 31, it is assumed that a plurality of transmission sources in the same frequency band do not transmit different information simultaneously (multiple connection).

  Since the input selector 44, the signal router 45, the functional block 46, and the system control block 50 all have the same transmission processing unit and reception processing unit, the transmission processing is represented below with the functional block 46 as a representative. Detailed configurations and operations of the receiver and the reception processing unit will be described.

  FIG. 4 is a block diagram illustrating a detailed configuration example of the function block 46.

  The functional block 46 includes a transmission processing unit 101, a reception processing unit 102, a signal processing unit 103, a control unit 104, and a system reference signal acquisition unit 105.

  In FIG. 4, the antenna 36a is illustrated in both the transmission processing unit 101 and the reception processing unit 102 for convenience, but the two antennas 36a are the same. In FIG. 4, the flow of image signals in the functional block 46 is a solid line, and the flow of control signals such as commands is a dotted line. The system is supplied from the system synchronization signal oscillator 61 via the system synchronization signal line 62. The reference signal is shown by a one-dot chain line.

  The transmission processing unit 101 performs transmission processing for transmitting the image signal supplied from the signal processing unit 103 and the control signal supplied from the control unit 104 by radio waves from the antenna 36a as transmission data. In the transmission processing unit 101, for example, 16QAM (Quadrature Amplitude Modulation) is adopted as a modulation method for modulating transmission data.

  The reception processing unit 102 performs reception processing for demodulating a signal supplied from the antenna 36a when the antenna 36a receives radio waves, and performs signal processing on the resulting data (including control signals) as necessary. To the unit 103 and the control unit 104.

  Note that the reception processing unit 102 employs a demodulation method in which the number of signal points is smaller than the number of modulation signal points (the number of modulation points) of the modulation method of the block on the transmission side. The modulation signal point of the modulation system means a signal point when represented by a signal point arrangement diagram (constellation diagram) composed of an I axis and a Q axis.

  FIG. 5 shows signal point arrangements of 16QAM, QPSK, and BPSK. The number of 16QAM modulation points (demodulation points) is 16, the number of QPSK modulation points (demodulation points) is 4, and the number of BPSK modulation points (demodulation points) is 2.

  The modulation scheme of the transmission processing unit of the transmission side block that transmits data to the reception processing unit 102 is 16QAM, which is the same as that of the transmission processing unit 101 of the functional block 46. Therefore, the reception processing unit 102 can employ QPSK (Quadrature Phase Shift Keying), BPSK (Binary Phase Shift Keying), or the like, which is a demodulation method with fewer signal points than 16QAM, as a demodulation method. In the present embodiment, description will be made assuming that BPSK is adopted as the demodulation method of reception processing section 102. Note that the case where the reception processing unit 102 employs QPSK as a demodulation method will be described later with reference to FIG.

  The signal processing unit 103 performs predetermined signal processing such as noise removal processing, image conversion processing, or image adjustment processing on the image signal supplied from the reception processing unit 102, and transmits the processed signal to the transmission processing unit. 101.

  The control unit 104 controls the transmission processing unit 101, the reception processing unit 102, and the signal processing unit 103 in accordance with a control signal supplied from the reception processing unit 102.

  The system reference signal acquisition unit 105 acquires a system reference signal supplied from the system synchronization signal oscillator 61 via the system synchronization signal line 62, and transmits a transmission processing unit 101, a reception processing unit 102, a signal processing unit 103, and a control unit. 104 is supplied.

  In the functional block 46 configured as described above, for example, a signal obtained by performing predetermined processing such as noise removal processing and image conversion processing on the received image signal is transmitted from the transmission processing unit 101 by radio waves. Sent.

  FIG. 6 shows a signal point arrangement diagram on the transmitting side and a corresponding signal point arrangement diagram on the receiving side.

  In the signal point arrangement diagram on the reception side in FIG. 6, the signal points are enlarged due to thermal noise, and the signal point arrangements are rotated clockwise due to phase shift.

  In a state where the physical environment is fixed in a limited space within the housing 32 of the signal processing device 31 and the arrangement of the substrates 35 to 37 and the shape of the housing 32 is not changed. The thermal noise is unpredictable, but the rotation angle of the signal point is steadily determined. In other words, it can be said that the communication path in the casing (in-casing communication path) is a communication path having a steady phase characteristic.

  Therefore, the transmission processing unit 101 includes a transmission signal point that matches the reception signal point (demodulation side signal point) as much as possible and includes the lowest error rate (BER) in a state including a phase shift. Learning to be determined (selected) as Then, when performing wireless communication, the transmission processing unit 101 performs transmission using the transmission signal point determined as the optimal transmission signal point. In other words, the transmission processing unit of the block on the transmission side transmits data that has been processed in advance to absorb the rotational change of the signal point due to the phase shift on the transmission side.

  As a result, even if the reception processing unit 102 does not have a circuit for adjusting the phase shift, accurate communication can be performed between the transmission side and the reception side.

  Next, learning processing for determining (selecting) an optimal transmission signal point for the reception side from among the transmission signal points of the transmission processing unit 101 will be described.

  In the learning processing, the more transmission signal points that can be selected, the more signal points that can be selected as reception signal points. Therefore, the modulation method on the transmission side uses the number of signal points on the reception side (the number of demodulation points). ) Is set to a modulation scheme having more transmission signal points.

  In the actual learning process, the transmission processing unit 101 of any one of the input selector 44, the signal router 45, the function block 46, and the system control block 50, which is a transmission side block, and the reception side block. The reception signal processing unit 101 of any one of the input selector 44, the signal router 45, the function block 46, and the system control block 50 communicates to determine the optimal transmission signal point on the receiving side. For convenience of explanation, the learning process will be described using the transmission processing unit 101 and the reception processing unit 102 of the function block 46.

  As described above, in the present embodiment, the modulation method on the transmission side is 16QAM, and the demodulation method on the reception side is BPSK. Therefore, the transmission side performs learning processing from among the 16 transmission signal points. Two optimum signal points are selected.

  With reference to the flowchart of FIG. 8, the learning process of each of the transmission side and the reception side will be described. This learning process is started when an initial setting command is received from the system control block 50 that controls the entire signal processing device 31.

  Accordingly, in the first step S11, the transmission processing unit 101 receives the initial setting command from the system control block 50, and the reception processing unit 102 also receives the initial setting command from the system control block 50 in step S51.

  In step S12, the transmission processing unit 101 prepares for transmission. Specifically, the transmission processing unit 101 generates a carrier wave signal based on the system reference signal supplied from the system reference signal acquisition unit 105 and sets a communication speed based on the received initial setting command. .

  The reception processing unit 102 on the reception side also prepares for reception in step S52. Specifically, the reception processing unit 102 generates a carrier wave signal based on the system reference signal supplied from the system reference signal acquisition unit 105, and sets a communication speed based on the received initial setting command. . Since the transmission side and the reception side generate a carrier wave signal based on the same system reference signal, frequency synchronization of the carrier wave signal is established.

  The contents set based on the initial setting command will be described with reference to FIGS.

  FIG. 9 shows the format of the initial setting command sent from the system control block 50.

  As shown in FIG. 9, the initial setting command includes “reception side demodulation method”, “communication speed”, “number of constellation candidates”, and “test pattern information”.

  “Reception-side demodulation method” is information indicating a reception-side demodulation method, specifically, information indicating QPSK or BPSK. In this embodiment, since the demodulation method on the receiving side is BPSK, the information input here is information representing BPSK.

  “Communication speed” is information indicating the communication speed of data between transmission and reception. Wireless communication within the housing is executed at this communication speed.

  The “number of constellation candidates” is information representing the number of sets of constellations (signal point arrangement) executed in the learning process. The control unit 104 stores a constellation candidate list, and in the learning process, the error rate for the number of constellation candidates provided as “the number of constellation candidates” from the top of the constellation candidate list. Will be calculated.

  FIG. 10 shows an example of a constellation candidate list for BPSK, and FIG. 11 shows an example of a constellation candidate list for QPSK.

When the demodulation method on the receiving side is BPSK, the number of combinations of ₁₆ C ₂ combinations can be taken as constellation candidates, and a predetermined number of constellation candidates are stored as a constellation candidate list.

Similarly, when the demodulation method on the receiving side is QPSK, as many constellation candidates as ₁₆ C ₄ combinations can be taken, but a predetermined number of constellation candidates are stored as a constellation candidate list. Yes.

  Normally, the same value as the number of candidates in the constellation candidate list is input to the “number of constellation candidates” of the initial setting command, and the error rate is calculated for all constellation candidate lists in the constellation candidate list. However, when the learning process is desired to be performed in a short time, a value smaller than the number of candidates in the constellation candidate list can be designated as the “number of constellation candidates”.

  The constellation candidate list is replaced by the constellation candidate list as necessary each time learning processing is performed, such as when adjusting parameters before shipping or when adjusting parameters after shipping. In this case, the smaller the index, the higher the probability of selection. Therefore, if a value smaller than the number of candidates in the constellation candidate list is specified as the “number of constellation candidates”, the error rate is calculated for the specified number of sets of constellation candidates from the top of the list. Is done.

  The “test pattern information” of the initial setting command is information for specifying what signal (bit string) is exchanged between transmission and reception using a test pattern.

  For example, PRBS (Pesudo Random Binary Sequence) can be employed as the test pattern.

  FIG. 12A shows a configuration example of the simplest M-sequence binary signal generator for generating PRBS, and this binary signal generator is configured by a shift register and an exclusive OR calculator.

  The M series binary signal generator can generate various PRBS according to the combination of shift register and exclusive OR operator and the initial value of the register given to it, and the structure and initial value of the shift register. Have the same feature that the same PRBS can be generated. In the example shown in FIG. 12B, a random bit string “0010111” having a period for every 7 bits is output.

  Using this M-sequence binary signal generator, for example, as a “test pattern information” of an initial setting command, a combination of a shift register and an exclusive OR calculator and an initial value of the register are given, thereby transmitting It is possible to generate the same test pattern on the receiving side and the receiving side.

  The M-sequence binary signal generator is provided in, for example, the signal processing unit 103 in the functional block 46, and a bit string as a test pattern is transmitted to the transmission processing unit 101 and the reception processing unit 102 as necessary. Supply.

  Returning to FIG. 8, after the various settings described above are performed based on the initial setting command, in step S <b> 13, the transmission processing unit 101 performs transmission constellation settings. That is, the transmission processing unit 101 sets one constellation candidate from the constellation candidate list as a constellation that is used for transmission (hereinafter referred to as a transmission constellation). For example, in the first process of step S12, a constellation candidate whose index number is 0 in FIG. 10 is set as a transmission constellation.

  In step S <b> 14, the signal processing unit 103 generates a test pattern based on the test pattern information supplied as a control signal from the reception processing unit 102 via the control unit 104. The generated test pattern is supplied from the signal processing unit 103 to the transmission processing unit 101 as a control signal.

  Similarly, on the reception side, in step S53, the signal processing unit 103 generates a test pattern based on the test pattern information supplied as a control signal from the reception processing unit 102 via the control unit 104. The generated test pattern is supplied from the signal processing unit 103 to the reception processing unit 102 as a control signal.

  In step S15, the transmission processing unit 101 transmits a test pattern. That is, the transmission processing unit 101 transmits a signal obtained by modulating the test pattern with QPSK to the reception side. For example, when the constellation candidate having the index number 0 in FIG. 10 is set as a transmission constellation, when the bit of the test pattern is “0”, “1010” is set to “1”. "0000" is transmitted.

  In step S54, the reception processing unit 102 on the reception side receives the signal corresponding to the test pattern transmitted from the transmission processing unit 101 via the in-casing wireless communication path, and demodulates the signal using BPSK. The value obtained by demodulation here is referred to as a received signal value.

  In step S55, the reception processing unit 102 calculates the error rate (BER) of the received signal value by comparing the received signal value with the test pattern generated in step S53.

  On the other hand, on the transmission side, in step S16, the transmission processing unit 101 determines whether or not to end the transmission of the test pattern. For example, it is set to generate and transmit a test pattern a predetermined number of times for one transmission constellation, and the transmission processing unit 101 determines a predetermined number of times for transmitting the test pattern. By determining whether or not the number of times has been reached, it is determined whether or not to end the transmission of the test pattern.

  If it is determined in step S16 that transmission of the test pattern is not terminated, the process returns to step S14, and the processes in steps S14 to S16 are repeated. Thereby, a random bit string as the next test pattern is generated, and a signal obtained by modulating the random bit string with QPSK is transmitted to the receiving side.

  On the other hand, when it is determined in step S16 that the transmission of the test pattern is completed, in step S17, the transmission processing unit 101 transmits a test pattern transmission end command to the reception side.

  In step S56, the reception processing unit 102 on the reception side determines whether a test pattern transmission end command has been received. If it is determined in step S56 that a test pattern transmission end command has not been received, the process returns to step S53, and steps S53 to S56 described above are repeated. That is, the next test pattern is generated, and the error rate of the received signal value is calculated.

  On the other hand, if it is determined in step S56 that the test pattern transmission end command has been received, the process proceeds to step S57, and the reception processing unit 102 transmits the transmission constellation transmitted by the transmission side and the error calculated in step S55. The rates are associated with each other and stored in the internal memory as a pair of transmission constellation and error rate. Note that the receiving side cannot recognize what constellation candidate the transmitting side has transmitted as a transmission constellation, so it actually corresponds to the order of the transmitted constellation (corresponding to the index number of the constellation candidate list). ) And error rate pairs are stored.

  The transmission processing unit 101 on the transmission side has tested all the constellation candidates in step S18, that is, from the top of the constellation candidate list, the number of constellation candidates equal to the number of “constellation candidates” of the initial setting command. It is determined whether a test pattern has been transmitted.

  If it is determined in step S18 that all the constellation candidates have not been tested, the process returns to step S13, and the processes in steps S13 to S18 described above are repeated. That is, the next constellation candidate is selected as a transmission constellation from the constellation candidate list, and a test pattern is transmitted using the selected transmission constellation.

  On the other hand, if it is determined in step S18 that all constellation candidates have been tested, the process proceeds to step S19, and the transmission processing unit 101 transmits a constellation test end command to the receiving side.

  On the other hand, the reception processing unit 102 on the receiving side determines whether or not a constellation test end command has been received in step S58. If it is determined in step S58 that the constellation end command has not been received, the process returns to step S53, and the processes of steps S53 to S58 are repeated.

  On the other hand, when it is determined in step S58 that the constellation end command has been received, in step S59, the reception processing unit 102 has the lowest error rate among the stored transmission constellation and error rate pairs. The transmission constellation (in order) is determined, and the determined transmission constellation is notified in step S60. That is, the reception processing unit 102 transmits the determined order of transmission constellations to the transmission side as a control command, and ends the process.

  On the other hand, the transmission processing unit 101 on the transmission side performs setting based on the notification of the transmission constellation from the reception side in step S20. That is, the transmission processing unit 101 receives the order of transmission constellations supplied as control commands, and determines the constellation candidate sent in the received order as the optimum constellation. Thereby, the two transmission signal points of the constellation candidates in the received order are determined as the optimum signal points.

  In step S20, the transmission processing unit 101 replaces the arrangement of the constellation candidate list as necessary so that the received constellation candidate is at the top of the constellation candidate list. That is, if the received constellation candidate is not at the highest position (index number 0) in the constellation candidate list, the transmission processing unit 101 moves the constellation candidate to the highest position and moves to a higher constellation before moving. The index number of each candidate is decremented by 1. At this time, when the received constellation candidate is at the top of the constellation candidate list, the transmission processing unit 101 does nothing. Thus, the processing of the transmission processing unit 101 ends.

  As described above, in the learning process, the constellation candidates are tested from the constellation candidate list by the number of constellation candidates of the initial setting command to calculate the error rate, and the constellation with the lowest error rate among them is calculated. Transmission candidate signal points are determined as optimum signal points.

  Next, the transmission processing of the transmission processing unit 101 and the reception processing of the reception processing unit 102 using the optimal transmission signal point will be described.

  FIG. 13 is a block diagram illustrating a detailed configuration example of the transmission processing unit 101.

  The transmission processing unit 101 includes a serial / parallel converter 121, binary / quaternary converters 122 and 123, multipliers 124 and 125, an adder 126, a multiplication circuit 127, and a π / 2 phase shifter 128.

  An image signal is supplied as serial data from the signal processing unit 103 to the serial-parallel converter 121. The serial-parallel converter 121 converts the supplied serial data signal into parallel data every 4 bits. Then, the serial-parallel converter 121 supplies the first two bits of the converted parallel data to the binary / quaternary converter 122 and supplies the subsequent two bits to the binary / quaternary converter 123.

  The binary / quaternary converter 122 converts an input vector having two binary (0 or 1) elements into one vector having four-value elements. For example, if the input 2 bits are [0, 1], the binary / quaternary converter 122 converts it to [01]. The converted value is supplied to the multiplier 124.

  Similarly, the binary / quaternary converter 123 converts an input vector having two binary elements into a single vector having quaternary elements, and supplies the converted value to the multiplier 125.

  The multiplier 124 multiplies the quaternary value supplied from the binary quaternary converter 122 by the carrier signal and supplies the multiplied signal to the adder 126. The multiplier 125 multiplies the quaternary value supplied from the binary / quaternary converter 123 by the carrier signal and supplies the multiplied signal to the adder 126. The carrier signal supplied to the multiplier 124 and the carrier signal supplied to the multiplier 125 are shifted in phase by π / 2 by the π / 2 phase shifter 128.

  The adder 126 synthesizes the signal supplied from the multiplier 124 and the signal supplied from the multiplier 125 to generate a 16QAM-modulated signal, which is supplied to the antenna 36a.

  The multiplier circuit 127 multiplies the system reference signal supplied from the system synchronization signal oscillator 61 (FIG. 3) to generate a carrier signal and supplies the carrier signal to the multiplier 125 and the π / 2 phase shifter 128. The π / 2 phase shifter 128 shifts the phase of the supplied carrier wave signal by π / 2 and supplies it to the multiplier 124.

  With the configuration described above, the transmission processing unit 101 can output a signal modulated by 16QAM to the antenna 36a.

  FIG. 14 is a block diagram illustrating a detailed configuration example of the reception processing unit 102.

  The reception processing unit 102 includes a multiplier circuit 141, a multiplier 142, an LPF (Low Pass Filter) 143, a comparator 144, and a statistical processing unit 145.

  The multiplier circuit 141 generates a carrier signal by multiplying the system reference signal supplied from the system synchronization signal oscillator 61 (FIG. 3), and supplies the carrier signal to the multiplier 142. The multiplier 142 multiplies the reception signal supplied from the antenna 26a and the carrier wave signal supplied from the multiplication circuit 141. The LPF 143 removes the high frequency component of the signal from the multiplier 142. The multiplier 142 and the LPF 143 convert the received signal into a baseband signal.

  The comparator 144 converts the baseband signal into a received signal value of “0” or “1” by comparing with a predetermined threshold, and supplies the received signal value to the statistical processing unit 145 and the signal processing unit 103 (FIG. 4). .

  The statistical processing unit 145 performs a process for determining an optimum signal point in the learning process described above. That is, the statistical processing unit 145 stores transmission constellation order and error rate pairs, calculates the error rate of each pair, and transmits optimal signal points as control signals.

  With the above configuration, the reception processing unit 102 can obtain a received signal value demodulated by BPSK.

  The transmission process will be described with reference to the flowchart of FIG.

  First, in step S <b> 81, the system reference signal acquisition unit 105 of the functional block 46 acquires the system reference signal supplied from the system synchronization signal oscillator 61 and supplies it to the transmission processing unit 101. Note that the processing in step S81 is described to explain that synchronization is established for the frequency by the transmission processing unit 101 performing transmission processing based on the system reference signal. The reference signal is supplied to the transmission processing unit 101 regardless of whether data is transmitted.

  In step S82, the control unit 104 selects an optimal transmission signal point with the lowest error rate in the reception processing unit 102 on the reception side from the 16 transmission signal points of 16QAM. Specifically, the control unit 104 selects the transmission signal point of the highest constellation candidate (index number 0) in the constellation candidate list. Then, the control unit 104 supplies a control signal for performing modulation using the selected transmission signal point to the transmission processing unit 101.

  In step S83, the transmission processing unit 101 modulates the image signal (transmission data) supplied from the signal processing unit 103 by 16QAM under the control of the control unit 104. For example, assuming that the transmission signal points selected in step S82 described above are “0000” and “1010”, which are the highest ranks in the constellation candidate list of FIG. Modulation is performed such that “1010” is transmitted when the signal value of the supplied image is “0”, and “0000” is transmitted when the signal value of the image is “1”.

  In step S84, the antenna 36a transmits the modulated signal supplied from the transmission processing unit 101 via the in-casing communication path, and ends the process.

  Next, the reception process will be described with reference to the flowchart of FIG.

  First, in step S <b> 101, the system reference signal acquisition unit 105 of the functional block 46 acquires the system reference signal supplied from the system synchronization signal oscillator 61 and supplies it to the reception processing unit 102. Note that, similarly to the description in step S81 described above, a system reference signal is supplied to the reception processing unit 102 regardless of whether or not reception processing is performed.

  In step S102, the reception processing unit 102 receives the signal transmitted from the transmission side via the antenna 36a, and in step S103, demodulates the received signal by BPSK. The demodulated value (received signal value) is supplied to the signal processing unit 103, and the process ends.

  As described above, by sharing the system reference signal, the frequency is synchronized between the transmitting side and the receiving side, and wireless communication is performed via a communication path that has a steady phase characteristic, that is, an in-casing communication path. When communication is performed, the modulation method on the transmission side is changed to a modulation method having more transmission signal points than the number of signal points on the reception side, and the error rate on the reception side is the highest among the transmission signal points on the transmission side. By selecting a transmission signal point to be lowered and transmitting data using the selected transmission signal point, it is possible to perform communication substantially similar to that performed by synchronous detection. In this case, since a phase shifter is not required, highly reliable (high accuracy) communication can be performed with a simple configuration.

  As described above, the transmission side selects the transmission signal point with the lowest error rate on the reception side from the transmission signal points that can be transmitted, so the number of transmission signal points that can be selected is larger. desirable.

  Therefore, for example, by providing a selector that inputs the output of the multiplier 124 and the multiplier 125 and outputs one of them to the adder 126 before the adder 126 of the transmission processing unit 101 of FIG. As shown in FIG. 17, four transmission signal points on the Q axis or the I axis (eight transmission signal points on both the Q axis and the I axis) can be added as transmission signal points that can be transmitted. . As a result, the number of selectable transmission signal points increases, and a more optimal transmission signal point can be selected. Also, when the demodulation method on the receiving side is BPSK, it is considered that there is a high possibility that the error rate will be lower if the signal point is placed on the I axis. It can be said that it is easy to find.

  Next, the case where the demodulation method on the receiving side is QPSK will be described.

  FIG. 18 is a block diagram illustrating a detailed configuration example of the reception processing unit 102 when the demodulation method on the reception side is QPSK. That is, it is a block diagram illustrating a configuration example of another embodiment of the reception processing unit 102.

  In FIG. 18, the same reference numerals are given to the portions corresponding to those in FIG. 14 for BPSK, and the description thereof is omitted as appropriate.

18 includes a multiplication circuit 141, multipliers 142 ₁ and 142 ₂ , LPFs 143 ₁ and 143 ₂ , comparators 144 ₁ and 144 ₂ , a statistical processing unit 145, a π / 2 phase shifter 201, and a parallel-serial conversion. The device 202 is configured.

That is, when the demodulation method is QPSK, the reception processing unit 102 includes two multipliers 142, two LPFs 143, and two comparators 144. The multipliers 142 ₁ , LPF 143 ₁ , and comparators 144 are provided. ₁ , multiplier 142 ₂ , LPF 143 ₂ , and comparator 144 ₂ are shown in FIG. 14 except that the phases of the carrier signals supplied to multiplier 142 ₁ and multiplier 142 ₂ are shifted from each other by π / 2. The same operations as the multiplier 142, the LPF 143, and the comparator 144 in the case of BPSK are performed.

The π / 2 phase shifter 201 supplies the carrier wave signal from the multiplier circuit 141 to the multiplier 142 ₁ with the phase shifted by π / 2. By doing so, the multiplier 142 ₁ , the LPF 143 ₁ and the comparator 144 ₁ obtain a baseband signal (Q-axis value) included in the carrier component orthogonal to the carrier signal of the received signal.

  The parallel-serial converter 202 converts 2-bit parallel data into serial data.

  Since the learning process and reception process of the reception processing unit 102 when the demodulation method is QPSK are the same as those in the above-described BPSK, the description thereof is omitted.

  Therefore, even when the demodulation method of the reception processing unit 102 is QPSK, the condition that the number of transmission signal points on the transmission side is larger than the number of reception signal points on the reception side satisfies the condition that the optimal transmission signal point selected as a result of learning is determined. By using and transmitting data, it is possible to perform highly accurate communication using synchronous detection with a simple configuration in which the phase shifter is omitted.

  Also, this can be said that when the modulation method on the transmission side is 16QAM, the reception side can cope with either BPSK or QPSK demodulation method (modulation method). When the side employs BPSK as a demodulation method, even if it is necessary to increase the speed of signals exchanged in the signal processing device 31 due to higher frame rate or higher resolution, the modulation method on the receiving side is changed. It can also be said that it can be handled only by changing from BPSK to QPSK. In other words, the transmission processing device 101 and the reception processing device 102 can have scalability with respect to the band of signals exchanged in the signal processing device 31.

  By the way, in the conventional wireless communication system, the same information can be transmitted from one transmitting device to a plurality of receiving devices by matching the frequency and phase of the carrier wave of the received signal and the internally oscillating carrier wave. However, the signal processing device 31 can perform the same thing.

  In the limited fixed space in the housing 32 of the signal processing device 31, when the transmitting side selects and transmits the optimum transmission signal point, there is a slight spread in the position where the signal can be received with a low error rate. To do. Therefore, by arranging a plurality of receiving boards (functional blocks 46) that perform predetermined processing within a range that can be received by the same transmission signal point, data can be transmitted to a plurality of receiving devices at the same time.

For example, as shown in FIG. 19, after a single functional block 46 ₁ is _first installed and used at a predetermined position in the housing 32, the same transmission signal point as that functional block 46 ₁ is used. within the range for receiving at second sheet, the third sheet of the functional block 46 _2, 46 ₃ is placed, by causing the first functional block ₄₆₁ the same signal processing as the processing capability, 2 It can be expanded to 3 times. As described above, the functional block 46 including the transmission processing device 101 and the reception processing device 102 can provide scalability with respect to the processing capability of the processing executed by the signal processing device 31.

  In addition, when a transmission signal point that can be received with a low error rate is different between a certain position (range) in the housing 32 and a certain position (range) in the housing 32, the transmission signal point is switched, It is also possible to separate the function block 46 of the other party to transmit. That is, in the radio communication system of the signal processing device 31, the receiving devices are grouped, and multicast communication that broadcasts within the group can be realized by the difference of transmission signal points.

For example, as shown in FIG. 20, the range that can be received by the transmission signal point that there constellation A, the function block 46 ₁ to 46 ₃ for performing image conversion processing arrangement, transmits that constellation A different constellation B change the receivable range at the signal point, by placing a functional block 46 ₅ perform the function blocks 46 ₄ and a noise removing processing for performing image adjustment processing, the signal router 45 which is the transmission side, the transmission signal point to be transmitted By doing so, the transmission destination can be selected. That is, when transmitted in constellation A, the data is received by the function blocks 46 ₁ through 46 ₃ are image conversion process performed with a 3-fold capacity, when transmitted by the constellation B is data There is received by the functional block 46 ₄ and 46 _5, so that the noise removal processing and image adjustment processing is performed. As described above, the functional block 46 including the transmission processing device 101 and the reception processing device 102 can provide scalability with respect to the number of functions performed by the signal processing device 31. It is particularly effective when the constellation A and B are signal point arrangements orthogonal to each other.

  The series of processes described above can be executed by hardware or can be executed by software. When a series of processing is executed by software, a program constituting the software executes various functions by installing a computer incorporated in dedicated hardware or various programs. For example, it is installed from a program recording medium in a general-purpose personal computer or the like.

  FIG. 21 is a block diagram illustrating a configuration example of hardware of a computer that executes the above-described series of processing by a program.

  In a computer, a CPU (Central Processing Unit) 301, a ROM (Read Only Memory) 302, and a RAM (Random Access Memory) 303 are connected to each other by a bus 304.

  An input / output interface 305 is further connected to the bus 304. The input / output interface 305 includes an input unit 306 including a keyboard, a mouse, and a microphone, an output unit 307 including a display and a speaker, a storage unit 308 including a hard disk and a nonvolatile memory, and a communication unit 309 including a network interface. A drive 310 that drives a removable medium 311 such as a magnetic disk, an optical disk, a magneto-optical disk, or a semiconductor memory is connected.

  In the computer configured as described above, the CPU 301 loads the program stored in the storage unit 308 to the RAM 303 via the input / output interface 305 and the bus 304 and executes the program, for example. Is performed.

  The program executed by the computer (CPU 301) is, for example, a magnetic disk (including a flexible disk), an optical disk (CD-ROM (Compact Disc-Read Only Memory), DVD (Digital Versatile Disc), etc.), a magneto-optical disk, or a semiconductor. It is recorded on a removable medium 311 which is a package medium composed of a memory or the like, or provided via a wired or wireless transmission medium such as a local area network, the Internet, or digital satellite broadcasting.

  The program can be installed in the storage unit 308 via the input / output interface 305 by attaching the removable medium 311 to the drive 310. Further, the program can be received by the communication unit 309 via a wired or wireless transmission medium and installed in the storage unit 308. In addition, the program can be installed in advance in the ROM 302 or the storage unit 308.

  The program executed by the computer may be a program that is processed in time series in the order described in this specification, or in parallel or at a necessary timing such as when a call is made. It may be a program for processing.

  Further, the program may be processed by one computer or may be distributedly processed by a plurality of computers. Furthermore, the program may be transferred to a remote computer and executed.

  The embodiment of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.

  That is, in the present embodiment, an image signal is a transmission target, but as a transmission target signal, for example, an audio signal or the like can be employed in addition to an image. The present invention can also be applied to communications performed between LSIs in addition to between boards.

  In the above-described embodiment, an example in which the modulation method on the transmission side is 16QAM and the demodulation method on the reception side is BPSK or QPSK has been described. However, the present invention is not limited to this modulation / demodulation method. The present invention can be applied to any modulation scheme that has more transmission signal points on the side than reception signal points on the reception side.

  Furthermore, in the above-described embodiment, the carrier signal is generated by multiplying the system reference signal by the multiplier circuit. However, the frequency of the carrier signal may be lower or higher than the frequency of the system reference signal.

  In the wireless communication of the signal processing device 31, it is assumed that a plurality of transmission sources in the same frequency band do not transmit different information simultaneously (multiple connection), but a plurality of transmission sources in the same frequency band does not exist. When allowing transmission of different information simultaneously, it can be realized by using a frequency division multiple access method or a time division multiple access method in combination.

It is a block diagram which shows the structure of an example of the conventional signal processing apparatus. It is a perspective view which shows the structural example of one Embodiment of the signal processing apparatus to which this invention is applied. It is a block diagram which shows the electrical structural example of the signal processing apparatus of FIG. It is a block diagram which shows the detailed structural example of a functional block. It is a figure which shows the signal point arrangement | positioning of 16QAM, QPSK, and BPSK. It is a figure which shows the difference in the signal point arrangement | positioning of a transmission side and a receiving side. It is a figure explaining the continuity of the transfer characteristic in the communication in a housing | casing. It is a flowchart explaining the learning process of each of the transmission side and the reception side. It is a figure explaining the format of an initialization command. It is a figure which shows the example of the constellation candidate list with respect to BPSK. It is a figure which shows the example of the constellation candidate list with respect to QPSK. It is a figure explaining a binary signal generator. It is a block diagram which shows the detailed structural example of a transmission process part. It is a block diagram which shows the detailed structural example of a reception process part. It is a flowchart explaining a transmission process. It is a flowchart explaining a reception process. It is a figure which shows the signal point arrangement | positioning at the time of selector insertion. It is a block diagram which shows the detailed structural example of a reception process part in case a demodulation system is QPSK. It is a figure explaining the scalability regarding a processing capability. It is a figure explaining the scalability regarding the number of functions. It is a block diagram which shows the structural example of one Embodiment of the computer to which this invention is applied.

Explanation of symbols

  31 signal processing device, 36a antenna, 46 functional block, 101 transmission processing unit, 102 reception processing unit, 103 signal processing unit, 104 control unit, 105 system reference signal acquisition unit

Claims (9)

Modulation means for modulating transmission data by a modulation method having a number of signal points larger than the number of demodulation points of the receiving device;
Selecting means for selecting a signal point having the lowest error rate in the receiving apparatus among signal points of the modulating means;
A transmission apparatus comprising: a transmission unit configured to transmit the transmission data modulated by the modulation unit at a signal point selected by the selection unit via a communication path having a steady phase characteristic. The transmission device according to claim 1, wherein the number of signal points selected by the selection unit is determined by a demodulation method of the reception device. The transmission apparatus according to claim 1, wherein the signal point with the lowest error rate is determined by learning to calculate an error rate on the receiving apparatus side with respect to the signal point included in the modulation unit. Modulating means for modulating transmission data by a modulation method having a larger number of signal points than the number of demodulation points of the receiving apparatus, and selecting means for selecting a signal point having the lowest error rate in the receiving apparatus among the signal points of the modulating means And a transmission unit that transmits the transmission data modulated by the modulation unit at the signal point selected by the selection unit via a communication path having a steady phase characteristic,
Among the signal points of the modulation means, select the signal point with the lowest error rate in the receiver,
A transmission method in which the transmission data modulated by the modulation means at a selected signal point is transmitted via a communication path having a steady phase characteristic. Computer
Modulation means for modulating transmission data by a modulation method having a number of signal points larger than the number of demodulation points of the receiving device;
Selecting means for selecting a signal point having the lowest error rate in the receiving apparatus among signal points of the modulating means;
A program for functioning as transmission means for transmitting the transmission data modulated by the modulation means at a selected signal point via a communication path having a steady phase characteristic. Synchronizing means for establishing frequency synchronization with respect to a signal transmitted from a transmission-side apparatus and received via a communication path having a steady phase characteristic;
Demodulating means for demodulating the received signal by a demodulation method having a signal number smaller than the signal number of the modulation method on the transmission side. The receiving apparatus according to claim 6, wherein the modulation method on the transmission side is 16QAM, and the demodulation method of the demodulation means is BPSK or QPSK. Synchronizing means for establishing frequency synchronization with respect to a signal transmitted from a transmission-side device and received via a communication path having a steady phase characteristic, and the received signal is obtained from a signal number of a modulation method on the transmission side. A receiving device comprising a demodulating means for demodulating with a demodulation system with a small number of signal points,
Establish frequency synchronization for the signal transmitted from the device on the transmitting side and received via the communication path whose phase characteristics are stationary,
A receiving method for demodulating the received signal by a demodulation method having a smaller number of signal points than a signal number of a modulation method on the transmission side. Computer
Synchronizing means for establishing frequency synchronization with respect to a signal transmitted from a transmission-side apparatus and received via a communication path having a steady phase characteristic;
A program for causing the received signal to function as a demodulating unit that demodulates the received signal with a demodulation method having a signal number smaller than the signal number of the modulation method on the transmission side.

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