JP2009171209A - Transmission state display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable an operator to easily determine a reception state while using an evaluation value or temporal details of constellation, in a transmission state display device for displaying thereon information about a transmission state of digital radio transmission. <P>SOLUTION: An evaluation value calculation means 37 calculates a predetermined evaluation value, on the basis of a distance between a point of a data symbol in a constellation of signals transmitted by digital radio transmission and a reference point of a data symbol in an ideal constellation, and a display means 40 displays thereon the calculated evaluation value as information about a transmission state of the digital radio transmission. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a transmission state display device that displays a transmission state in, for example, establishment or adjustment of a transmission path for digital wireless transmission, and in particular, a constellation evaluation value and a constellation time in a terminal display of a micro reception base station system. The present invention relates to a transmission status display device that makes it possible for an operator to easily determine a reception status using an appropriate process.

As a method of transmitting a television broadcast material to a television station head office, there is a wireless transmission of the material. In recent years, the transmission system is shifting from analog transmission to digital transmission in accordance with the digitization of television broadcasting, and therefore, technical improvement in digital wireless transmission has become an important issue.
In such digital radio transmission, a micro-reception base station system including fixed radio transmission between base stations using FPU (Field Pick-up Unit) is generally used.

As such a micro reception base station system, for example, the one shown in FIG. 1 can be used. Note that FIG. 1 is referred to in an embodiment to be described later, and is introduced here as a reference. However, the present invention is not intended to be unnecessarily limited.
The evaluation of the constellation, which is one of the tone support data in the micro reception base station system as shown in FIG. 1, has conventionally been based on visual observation by humans, so the judgment differs depending on the experience and subjectivity of the operator. In addition, in order to confirm the constellation time, it was necessary to periodically store the constellation as an image or video data with a large amount of data and analyze the image for the period to be confirmed. .

JP 2007-97029 A

As described above, in the conventional micro reception base station system, the evaluation of the constellation is only visual and has no quantitative index, and the objective evaluation value of the transmission state can always be appropriately recorded. There was nothing I could do.
The present invention has been made in view of such conventional circumstances. For example, in the terminal display of the micro receiving base station system, the reception state by the operator using the evaluation value of the constellation and the time history of the constellation. An object of the present invention is to provide a transmission state display device that can easily determine the transmission state.

In order to achieve the above object, according to the present invention, a transmission status display device that displays information related to the transmission status of digital wireless transmission has the following configuration.
That is, the evaluation value calculation means is configured to determine a distance d between a data symbol point in a constellation of a signal transmitted by the digital radio transmission and a reference point of a data symbol in an ideal constellation (see an example described later). ) To calculate a predetermined evaluation value. The display means displays the evaluation value calculated by the evaluation value calculation means as information relating to the transmission state of the digital wireless transmission.

  Therefore, for example, in the terminal display of the micro reception base station system, it is possible to easily determine the reception state by the operator using the evaluation value of the constellation and the time history of the constellation.

Here, the point of the data symbol in the constellation of the signal transmitted by digital wireless transmission represents the point (position) of the data symbol of the actually transmitted signal, and the data symbol in the ideal constellation The reference point represents a point (position) of a data symbol in an ideal case where there is no error during transmission.
Further, in order to calculate the evaluation value, for example, a minimum distance L between reference points in an ideal constellation (see an example described later) can be used.

Various evaluation values may be used, and a margin value D and an average error E (see examples described later) can be used as a preferable example.
Various methods can be used for displaying the evaluation value on the screen. For example, a method of displaying a numerical value, a method of displaying it in a graph, a method of displaying a time history, or the like is used. be able to.

  As described above, in the transmission status display device according to the present invention, for example, in the terminal display of the micro reception base station system, the reception status by the operator using the evaluation value of the constellation and the time history of the constellation. Can be easily determined.

Embodiments according to the present invention will be described with reference to the drawings.
FIG. 1 shows a configuration example of a micro reception base station system according to an embodiment of the present invention.
In the system of the micro reception base station system of this example, there are a transmission point 1 (transmission point A), a base station 2, a head office 3, and a transmission point 4 (transmission point B).
The transmission point 1 includes a transmission unit 11 and an antenna 12.
The base station 2 includes a rotation receiving antenna 21, a receiving unit 22, a transmitting unit 23, a fixed antenna 24, a controlled terminal station 25, and a modem unit 26.
The head office 3 includes a fixed antenna 31, a receiving unit 32, a rotating receiving antenna 33, a receiving unit 34, a decoding unit 35, an information generating unit 36, an information editing unit 37, a modem unit 38, a control terminal. A station 39, an operation terminal 40, a network 61, and a network 62 are provided.
The transmission point 2 includes a transmission unit 51 and an antenna 52.
In this example, a network 71 is provided that connects the modem unit 26 of the base station 2 and the modem unit 38 of the head office 3 so that they can communicate with each other.

An example of the operation performed in the micro reception base station system of this example is shown.
In this example, a case where a material is transmitted from the transmission point 1 and the transmission point 4 to the head office 3 is shown.
The material from the transmission point 1 (transmission point A) at a long distance from the head office 3 is wirelessly transmitted to the head office 3 through the base station 2. First, the transmission unit 11 at the transmission point 1 converts the material into a microwave signal that can be wirelessly transmitted, and transmits the radio wave from the antenna 12.
Here, the transmission unit 11 encodes an SDI (Serial Digital Interface) signal into a TS (Transport Stream) signal that is a frame format of a fixed-length packet format used for transmission in the FPU, and modulates it to an intermediate frequency signal After that, it has a function of converting the frequency to the microwave band and transmitting it to the antenna 12.

The radio wave transmitted from the transmission point 1 is received by the device of the rotation receiving antenna 21 in the base station 2 and sent to the receiving unit 22.
Here, the receiving unit 22 has a function of converting a microwave band signal into an intermediate frequency signal, demodulating it into the TS signal, and decoding it into an SDI signal. However, the receiving unit 22 in the base station 2 only needs to have a function for converting to the TS signal with no signal degradation at the minimum.

The TS signal is transmitted from the receiving unit 22 to the transmitting unit 23 and transmitted from the fixed antenna 24 by radio waves.
Here, similarly to the reception unit 22 described above, the transmission unit 23 in the base station 2 only needs to have a function of converting a TS signal into a microwave band signal at a minimum.
The radio wave transmitted from the base station 2 is received by the fixed antenna 31 of the head office 3, decoded into an SDI signal by the receiving unit 32 and the decoding unit 35, and sent to the main line.

  In addition, the material from the transmission point 4 (transmission point B) at a short distance from the head office 3 is transmitted from the antenna 52 through the transmission unit 51, directly received by the device of the rotary reception antenna 33 of the head office 3, and The data is decoded by the receiving unit 34 and the decoding unit 35 and sent to the main line.

In wireless transmission using such a system, it is important how efficiently the base station 2 can receive radio waves from the transmission point 1. That is, the direction of the reception antenna 21 in the base station 2 must be changed depending on the position of the transmission point 1. For this reason, in the micro receiving base station system, a receiving antenna 21 having a rotating base that can be rotated by remote control from the head office 3 (rotating receiving antenna) is used.
Similarly, in the head office 3, the rotation receiving antenna 33 is used for the transmission point 4.

A method for monitoring and monitoring the rotation receiving antenna 21 will be described.
In the head office 3, the control packet transmitted from the operation terminal 40 to the network is received by the control terminal station 39 and converted into a serial signal. The serial signal is further modulated, for example, into an analog signal by the modem 38 and transmitted to the base station 2.
It is also possible to connect a plurality of operation terminals and a plurality of control terminal stations to the network 61 and perform transmission / reception by specifying a transmission partner and a reception partner based on identification information (ID) of each device.

The analog signal transmitted from the modem unit 38 is received by the modem unit 26 in the base station 2, demodulated into a serial signal, and then transmitted to the controlled terminal station 25.
The controlled terminal station 25 decodes the signal (control signal) received from the modem unit 26 and controls the device of the rotary receiving antenna 21 based on the decoding result.

Further, information (monitoring information) such as an angle in the device of the rotation receiving antenna 21 is sent to the controlled terminal station 25 as a monitoring signal.
The controlled terminal station 25 transmits the monitoring information to the modem unit 26 as a serial signal.
The modem unit 26 modulates the serial signal received from the controlled terminal station 25 into, for example, an analog signal and transmits the analog signal to the head office 3.

The modem unit 38 in the head office 3 demodulates the analog signal received from the modem unit 26 of the base station 2 into a serial signal and transmits the serial signal to the control terminal station 39.
The control terminal station 39 decodes the serial signal received from the modem unit 38 and transmits a monitoring packet to the network 61 based on the decoding result.
The operation terminal 40 receives the monitoring packet via the network 61 and displays it on the terminal as information.

As described above, it is possible to control and monitor the device of the rotation receiving antenna 21 in the base station 2.
Further, in the micro reception base station system of the present example, the reception level and transmission level in the reception unit 22 and transmission unit 23 installed in the base station 2 and the transmission / reception channel are the same as in the control monitoring of the apparatus of the rotating reception antenna 21 described above. (Frequency band), modulation method, transmission output, decoding method, and for example, contact switch selection of signal switch, signal input / output selection in signal multiplexing / demultiplexing device, etc. It is possible to control and monitor by a series of signal transmission in the terminal station 25 and the control device.

  Further, when transmitting directly to the head office 3 as in the case of material transmission from the transmission point 4, the rotation existing in the head office 3 using the signal transmission path of the operation terminal 40, the control terminal 39, and the control device. It is possible to control and monitor the device such as the receiving antenna 33 and the receiving unit 34.

Here, what is important is information on the tone support data, which is a material for adjusting the direction of the receiving antenna.
In the case of transmission through the base station 2, this information is in the monitoring information sent from the receiving unit 22 in the base station 2 to the operation terminal 40 through the controlled terminal station 25 and the control terminal station 39 of the head office 3. Alternatively, in the base station 2, when the receiving unit 22 receives the received signal from the apparatus of the rotary receiving antenna 21, converts it into a TS signal, and transmits it, the tone support data is multiplexed in the TS signal.

  After the TS signal multiplexed with it is transmitted to the TS signal again at the receiving unit 32 of the head office 3 through the fixed line of the fixed antennas 24 and 31 through the transmitting unit 23 and transmitted, The information generator 36 separates the transmitted TS signal. The separated tone support data is edited in a form that is easy for the operator to understand in the information editing unit 37, transmitted to the operation terminal 40 through the network 62, and displayed on the terminal screen.

  Further, the tone support data in the case of being directly transmitted to the head office 3 is displayed on the terminal screen by the monitoring information transmitted from the receiving unit 34 that receives the signal to the operation terminal 40 through the control terminal station 39, or The tone support data multiplexed on the TS signal by the receiving unit 34 is separated by the information generating unit 36, edited by the information editing unit 37, and then transmitted to the operation terminal 40, thereby being displayed on the terminal screen. .

  As described above, the operator at the head office 3 uses the operation terminal 40 to check the information on the reception state at the reception units 22 and 34 and connect the devices of the rotary reception antennas 21 and 33 and the reception units 22 and 34. Control and adjust the antenna direction and the reception setting for the transmission points 1 and 4.

Thus, since the operator who controls each apparatus needs to judge the present receiving state from the information displayed on the terminal screen, the tone support data used as the material is necessary for the micro receiving base station system. Indispensable information.
Further, unlike the conventional analog wireless transmission, there are a plurality of state parameters for the digital transmission state in addition to the received electric field level. Information included in the current tone support data includes, for example, TMCC (Transmission and Multiplexing Configuration Control) information including transmission parameters such as reception frequency and modulation method in the reception units 22 and 34, reception level, margin (Margin) Degree), BER (Bit Error Rate), delay profile, constellation, etc. However, since only one index is insufficient as information for evaluating the transmission state, usually, a plurality of indices are used. Often evaluated comprehensively.

Next, constellation evaluation performed in the micro reception base station system of this example will be described in detail.
In this example, the information editing unit 37 evaluates the constellation.
Here, it is assumed that a data symbol group indicated by the constellation of the signal under investigation analyzed per unit time is generated by the information generation unit 36 and sent to the information editing unit 37.

FIG. 2 shows an example of a constellation evaluation technique performed by the information editing unit 37 in such a case. Specifically, ideal reference points 201 and 202, an intermediate point 203, and a data symbol 204 on the constellation are shown.
In general, a constellation in digital wireless transmission is developed on IQ coordinates. Here, I represents an in-phase component of a signal in digital wireless transmission, and Q represents an orthogonal component of the signal.

In FIG. 2, a reference point 201 and a reference point 202 are excerpts of ideal reference points indicated by an ideal constellation calculated by the signal modulation method, and the reference point 202 exists at a distance L closest to the reference point 201. One of the ideal reference points. Point 203 is an intermediate point between reference point 201 and reference point 202, and the distance between point 203 and the reference point (reference point 201 or reference point 202) is (L / 2). The data symbol 204 is one of the data symbol groups provided by the information generation unit 36.
In this example, for all the data symbols 204 provided by the information generator 36, distances d to the nearest ideal reference points 201 and 202 are calculated, and the maximum value among them is set as the maximum error Md. Then, a difference between (L / 2) and the maximum error Md is calculated, and this is set as a first evaluation value as a constellation margin value D.

  In digital transmission, in a stable state where there is a sufficient received electric field, a BER is sufficiently low, and a margin is taken, the constellation indicating the transmission state of the transmission is a symbol that is almost the same as the ideal constellation. Indicates placement. At this time, since the data symbols 204 are located so as to concentrate on the ideal reference points 201 and 202 of the ideal constellation, d calculated for each data symbol 204 is small, and the maximum error Md is also small. .

  On the other hand, when the state deteriorates and the received electric field decreases, the BER increases, or the margin disappears, the constellation symbol arrangements are not concentrated on the ideal reference points 201 and 202, and the transmission state Since the deterioration appears as an increase in the value of each d, the maximum error Md also increases. At this time, the distance d from the ideal reference points 201 and 202 is related to the margin of the distance from the data symbol to be located at another ideal reference point, and if the transmission state becomes excessively bad, different ideal references. Data symbols that should be located at points will interfere with each other, resulting in signal errors.

Thus, the maximum error Md indicates the risk of interference with other data symbols, and it can be seen that the maximum error Md is useful as a measure for judging whether the transmission state is good or bad.
The distance L is related to the amount of information that can be transmitted per unit time according to the signal modulation method. When this amount of information increases, the number of ideal reference points increases on the constellation, and the interval between each reference point is narrowed. Therefore, positional interference between data symbols is likely to occur.
Since the margin value D defined above indicates an absolute margin value for positional interference between data symbols in the constellation, the transmission state can be evaluated regardless of the modulation scheme (transmission rate). Is possible.

Next, as the second evaluation value, an average of d calculated for each symbol is calculated as an average error E.
Since the average error E is the average absolute deviation when the difference between the coordinates of the data symbol 204 and the ideal reference points 201 and 202 is taken as a deviation, the dispersion degree of the data symbol group can be read from this value.
This value can be replaced by a known state evaluation value MER (Modulation Error Ratio). However, the calculation method of MER is an ideal value obtained by converting the absolute value of the distance vector of the data symbol 204 into power. This is to obtain the ratio of the power of the reference points 201 and 202, and in the evaluation on this constellation, since it cannot be compared with the margin value D, the above average is used as the evaluation value using the calculated d. The error E is used.

Here, as a method of calculating the maximum error Md related to the margin value D, for example, averaging the upper number% (for example, the upper constant number) of d calculated for all symbols, or The smallest d among the upper several% (for example, the upper constant number) can be adopted, and can be set in any way according to the setting criteria.
Further, for the margin value D, for example, a certain number is added to or subtracted from {(L / 2) -Md}, or a certain ratio is multiplied / divided with respect to {(L / 2) -Md}. It can also be used as an evaluation value.

As a method of calculating the average error E, for example, a numerical value indicating the degree of dispersion such as a standard deviation of d, or an overall number such as d of the upper few% (for example, upper constant number) as a whole. It is also possible to use a value extracted on the basis of a certain standard.
Further, as evaluation in units of squares using variance, it is also possible to use a method in which the maximum error Md is squared and both are compared and evaluated in a square dimension.

With reference to FIG.3 and FIG.4, the terminal display of the micro receiving base station system of this example is demonstrated.
FIG. 3 shows an example of the display of the direction adjustment operation screen (direction screen) on the operation terminal 40 of the micro reception base station system of this example.
In the direction adjustment operation screen of this example, as a display area of each monitoring information, a meter (BL meter display unit) 301 that visually represents the received electric field of the receiving units 22 and 34, and a part that represents the BL value as the value of the received electric field (BL value display unit) 302, a portion (rotation reception antenna device angle display unit) 303 representing the angle of the device of the rotation receiving antennas 21 and 33, and a monitoring portion representing the state of the device of the rotation reception antennas 21 and 33 ( Rotation receiving antenna device monitoring display unit) 304, a monitoring part (reception unit monitoring display unit) 305 indicating settings and states of the receiving units 22 and 34, and a control unit for controlling the devices of the rotating reception antennas 21 and 33. (Rotary reception antenna device control display unit) 306, a map screen portion (map display unit) 307 indicating the position and direction of the antenna, a scale change of the map, and a table of altitude information of the map Button for causing (map display button) 308 is provided.

  Further, the direction adjustment operation screen of this example is provided with a button (tone support data display button) 309 for displaying the tone support data. When the operator operates the mouse or the like and presses the tone support data display button 309, the tone support data display window can be displayed.

FIG. 4 shows an example of a display of a tone support data display window which is a screen for displaying tone support data on the operation terminal 40 of the micro reception base station system of this example.
In the tone support data display window of this example, a portion (BER display portion) 401 representing the BER state, a portion (margin display portion) 402 representing the margin (margin), and a portion (BL value display) representing the BL value. Part) 403, BL meter (BL meter display part) 404, part (TMCC information display part) 405 representing TMCC information, part (delay profile information display part) 406 representing delay profile information, and constellation A portion (constellation display portion) 407 to be represented is provided.

In this example, the constellation display shown in FIG. 4 is further added with information on the evaluation values (first evaluation value D and second evaluation value E) as shown in FIG. Display.
FIG. 5 shows an example of display of constellation information including information related to the evaluation value of this example on the operation terminal 40 of the micro reception base station system of this example.
In the constellation information display screen of this example, a portion (modulation method / error) that displays a signal modulation method and an error limit (for example, (L / 2) described above) calculated by the modulation method at the top of the screen. A limit display portion 501 and a portion (constellation evaluation value display portion) 502 for displaying each evaluation value (margin value D, average error E, maximum error Md) are provided.

In addition, the constellation information display screen of this example is provided with a portion for displaying a margin value D, an average error E, and a maximum error Md in a graph.
Specifically, the reference points 503 and 504 represent constellation ideal reference points. An intermediate point 505 represents an intermediate point between both reference points 503 and 504. As a result, the error limit can be expressed by the distance between the reference points 503 and 504 and the intermediate point 505.
Further, by displaying an average error (average error E) 506, a maximum error (maximum error Md) 507, and a margin value (margin value D) 508 on a straight line connecting the reference point 503 and the reference point 504, the current state is displayed. It can be read visually.

At this time, for example, when the distance between the reference points 503 and 504 on the screen is changed in accordance with the change in the error limit, the margin between the reference points (limit error) determined by the transmission method is also visually confirmed. It can be understood.
It is also useful to alert the operator by changing the display color of each value or line according to the change in value. In addition, when the evaluation value exceeds a certain threshold value (or when the evaluation value becomes less than the certain threshold value, etc.), a warning message is displayed on the screen of the operation terminal 40 and notified with a warning sound. Information can be provided.

  Here, regarding the display of information as shown in FIG. 5, it is possible to use a method in which the information editing unit 37 creates a screen as shown in FIG. 5 and provides it to the operation terminal 40 through, for example, a WEB encoder. it can. Alternatively, a method of creating and displaying a screen based on data provided from the information editing unit 37 on the operation terminal 40 can also be used.

  With the display of this example, the constellation can be evaluated as a quantitative value. As a result, data that has been stored as images (or videos) can be stored as values, and a significant reduction in the required amount of information storage resources can be realized. Further, since the history of the constellation can be recorded as a change in value, the past data analysis can be greatly improved by statistical processing of the evaluation value or graphing.

As an example, in the constellation information display screen of this example shown in FIG. 5, a button (graph display button) 509 for performing graph display is provided. Then, in response to the operator operating the mouse or the like and pressing down the graph display button 509, the numerical value history 510 of the evaluation value is displayed in a graph below the graph display button 509. In this case, for example, it is also effective to display a plurality of evaluation values at a time to enable visual comparison.
In addition, for example, in the display portion of the average error 506, the maximum error 507, and the margin value 508, a display in which the range moved during the past fixed period is overlapped (for example, the range of max and min in the figure) is displayed. Thus, it is possible to determine the state by grasping the stability / instability of the state based on the range of the evaluation value and the peak value.

As described above, in the micro reception base station system of this example, the signal constellation in the digital radio transmission is displayed as the status display of the digital radio transmission on the display screen for establishing or adjusting the transmission path of the digital radio transmission. Displays the transmission state including the evaluation value calculated from.
Specifically, as the evaluation value, for example, regarding the constellation of the received signal, the distance between each data symbol of the constellation and the ideal reference point indicated by the ideal constellation calculated by the transmission modulation scheme, A value calculated using the minimum distance between reference points in the ideal constellation is used. Then, information including the evaluation value and the history is displayed on the operation terminal 40.
In this example, the above-described evaluation value can be expressed using an objective and quantitative value, and the constellation time history can be stored and expressed as a change in the evaluation value with a small amount of data. It is.

  Therefore, in this example, the constellation in digital wireless transmission can always be objectively and quantitatively evaluated, and the time histories of the constellation can be stored and expressed as changes in the evaluation value with a small amount of data. As a result, a new evaluation index can be given to the terminal display of the micro reception base station system, and the determination (determination) of the transmission state by the operator can be supported (supported) more than before. In this way, in this example, by evaluating and displaying the transmission state from the constellation, for the operator etc., referring to the information such as the evaluation value of the constellation and the time history of the constellation with a graph or the like, It is possible to realize a situation in which the reception state can be more easily determined.

  In the micro reception base station system of this example, the transmission status display device is configured by the functions of the information generation unit 36, the information editing unit 37, and the operation terminal 40 in the head office 3, and in such a transmission status display device, The function of the evaluation value calculation means for calculating a predetermined evaluation value (in this example, margin value D and average error E) may be provided to the information editing unit 37 (or other processing units or a plurality of processing units). The operation terminal 40 has a function of display means for displaying the calculated evaluation value on the screen.

Here, the configuration of the system and apparatus according to the present invention is not necessarily limited to the configuration described above, and various configurations may be used. The present invention can also be provided as, for example, a method or method for executing the processing according to the present invention, a program for realizing such a method or method, or a recording medium for recording the program. It is also possible to provide various systems and devices.
The application field of the present invention is not necessarily limited to the above-described fields, and the present invention can be applied to various fields.
In addition, as various processes performed in the system and apparatus according to the present invention, for example, the processor executes a control program stored in a ROM (Read Only Memory) in hardware resources including a processor and a memory. A controlled configuration may be used, and for example, each functional unit for executing the processing may be configured as an independent hardware circuit.
The present invention can also be understood as a computer-readable recording medium such as a floppy (registered trademark) disk or a CD (Compact Disc) -ROM storing the control program, and the program (itself). The processing according to the present invention can be performed by inputting the program from the recording medium to the computer and causing the processor to execute the program.

It is a figure which shows the structural example of the micro receiving base station system which concerns on one Example of this invention. It is a figure which shows an example of the method of constellation evaluation. It is a figure which shows an example of the display of the direction adjustment operation screen in the operation terminal of a micro reception base station system. It is a figure which shows an example of a display of a mode support data display window. It is a figure which shows an example of the display of the constellation information containing the information regarding an evaluation value.

Explanation of symbols

1, 4 ··· Transmission point 2 ·· Base station 3 · · Head office 11, 23, 51 · · Transmitter 12, 52 · · Antenna 21, 33 · · · Rotating reception antenna 22, 32, 34 ..Receiving section 24, 31 .. Fixed antenna 25..Controlled terminal station 26, 38..Modulation / demodulation section 35..Decoding section 36..Information generation section 37..Information editing section 39. ..Control terminal station, 40..Operating terminal, 61, 62, 71..Network,
201, 202.. Ideal reference point, 203 ... intermediate point, 204 data symbol
301 .. BL meter display section, 302 .. BL value display section, 303 .. Rotation receiving antenna apparatus angle display section, 304 .. Rotation reception antenna apparatus monitoring display section, 305 .. Reception section monitoring display section, 306. Rotation receiving antenna device control display unit 307 .. Map display unit 308 .. Map display button 309.
401... BER display section 402.. Margin display section 403 .. BL value display section 404... BL meter display section 405 .. TMCC information display section 406 .. Delay profile information display section 407. Constellation display,
501 .. Modulation method Error limit display section 502. Constellation evaluation value display section 503 504. Ideal reference point 505 Intermediate point 506 Average error 507 Maximum error 508・ Margin, 509 ・ ・ Graph display button, 510 ・ ・ Numerical history of evaluation value,

Claims (1)

In a transmission status display device that displays information about the transmission status of digital wireless transmission,
Evaluation value calculation means for calculating a predetermined evaluation value based on a distance between a data symbol point in a constellation of a signal transmitted by the digital wireless transmission and a reference point of the data symbol in an ideal constellation;
Display means for displaying the evaluation value calculated by the evaluation value calculation means as information relating to the transmission state of the digital wireless transmission;
A transmission state display device comprising:

Images