JP5593172B2 - Wireless device - Google Patents

Description

  The present invention relates to a radio apparatus that divides a given frequency band into a plurality of subcarrier groups composed of a plurality of orthogonal subcarriers, assigns data to the subcarrier groups, and performs transmission.

  A radio apparatus using OFDM (Orthogonal Frequency-Division Multiplexing) is a multi-carrier modulation scheme that transmits data using a plurality of orthogonal subcarriers, and a plurality of subcarriers orthogonal to a given frequency band. Are divided into a plurality of subcarrier groups (subchannels), and data is allocated to the subcarrier groups for transmission. As a result, since data can be transmitted while being distributed to a plurality of subcarriers, it is possible to reduce the probability of data loss due to frequency selective fading by multipath.

  However, if interference waves occur continuously in the subcarrier group, the subcarriers that have been disturbed cannot contribute to data transmission and communication quality deteriorates. There has been proposed a radio apparatus that estimates a propagation path state and transmits data using only a subcarrier group with a good propagation path state (see, for example, Patent Document 1).

JP 2010-154417 A

  However, the conventional radio apparatus is not notified of the communication quality of each subcarrier belonging to each subcarrier group, and the user cannot grasp under what circumstances the communication quality is deteriorated. There was a point.

  The present invention has been made in view of such a problem, and an object of the present invention is to use it for data transmission after the user easily grasps the communication quality of each subcarrier in units of subcarrier groups. A user can set a used subcarrier group and a non-used subcarrier group that is not used for data transmission, and is to provide a wireless device that is safe and flexible in operation.

In order to achieve the above object, a wireless device according to the present invention is configured as follows.
The wireless device according to claim 1 is a wireless device that divides a given frequency band into a plurality of subcarrier groups including a plurality of orthogonal subcarriers, assigns data to the subcarrier groups, and performs transmission. The subcarrier group to which the subcarrier group belongs can be distinguished from the communication quality detection means for detecting the communication quality of each of the plurality of subcarriers, and the communication quality list of the plurality of subcarriers detected by the communication quality detection means. Generating a subcarrier status notification screen for reporting in a state, generating a usage instruction screen for instructing use / non-use of the subcarrier group, and displaying the subcarrier status notification screen and the usage instruction screen on the same screen Based on the status notification screen generation means to be displayed on the display means and the use instruction screen displayed on the display means. An input unit that receives an instruction to use / not use the subcarrier group, and a subcarrier group to be used for data transmission based on the instruction to use / not use the subcarrier group received by the input unit. Group control means for setting an unused subcarrier group that is not used for transmission is provided, and data is allocated to the used subcarrier group set by the group control means and transmitted.

  The radio apparatus according to the present invention enables a user to easily grasp the communication quality status of each subcarrier in units of subcarrier groups and use subcarrier groups used for data transmission and unused subcarriers not used for data transmission. There is an effect that the user can set the carrier group.

It is a block diagram which shows the structure of embodiment of the radio | wireless apparatus which concerns on this invention. It is a figure which shows the example of a status alert | report screen displayed on the display part shown in FIG. It is a figure which shows the example of a detailed display screen displayed on the display part shown in FIG.

  DESCRIPTION OF EMBODIMENTS Preferred embodiments (examples) of the present invention will be described below with reference to the accompanying drawings.

  The radio apparatus 1 according to the present embodiment is a radio apparatus that divides a given frequency band into a plurality of subcarrier groups including a plurality of orthogonal subcarriers, assigns data to the subcarrier groups, and performs transmission. Referring to FIG. 1, a group control unit 11 sets a subcarrier group used for data transmission as a used subcarrier group and sets a subcarrier group not used for data transmission as an unused subcarrier group; Division unit 12, subcarrier mapping unit 13, pilot generation unit 14, group arrangement unit 15, IFFT (Inverse Fast Fourier Transform) unit 16, and GI (Guard interval) insertion unit 17 and an RF (wireless) unit 18.

  Transmission data that is digital data input to the data division unit 12 is divided into data according to the number of used subcarrier groups set by the group control unit 11, and the output of the data division unit 12 is subcarrier mapping unit 13. Is input. The subcarrier mapping unit 13 assigns the divided data to each used subcarrier group, performs mapping processing of data symbols assigned to the subcarriers according to the number of subcarriers for each used subcarrier group, and a pilot generation unit. Reference numeral 14 is a known symbol on both the transmission side and the reception side, and generates a pilot symbol used for fading compensation.

  The outputs of the subcarrier mapping unit 13 and the pilot generation unit 14 are respectively input to the group arrangement unit 15, and the group arrangement unit 15 inserts pilot symbols between data symbols, and pilots according to the arrangement of the used subcarrier groups. Symbols and data symbols are arranged in the frequency direction. Note that pilot symbols may be periodically inserted into all subcarriers, the first symbol may be inserted into all subcarriers, and the subsequent symbols may be inserted into some subcarriers. . Moreover, the group arrangement | positioning part 15 forms a null subcarrier group by arrange | positioning zero to the subcarrier group which is not used, ie, the subcarrier group which is not set to the use subcarrier group by the group control part 11. Thereby, effective data as data to be transmitted is arranged in the used subcarrier group, and null data is arranged in the unused subcarrier group.

  The output of the group arrangement unit 15 is input to the IFFT unit 16, and the IFFT unit 16 converts each symbol arranged in the frequency direction into a time domain signal, and generates an OFDM symbol having a certain time length. The output of the IFFT unit 16 is input to the GI insertion unit 17, and the GI insertion unit 17 copies a certain length from the latter half of the OFDM symbol and places it as the guard interval at the beginning of the OFDM symbol to place the baseband OFDM symbol. Generate. The baseband OFDM symbol in which the guard interval is inserted is converted into a high-frequency signal by the RF unit 18 and transmitted from the antenna 19 to the wireless transmission path.

  The radio apparatus 1 further includes a synchronization unit 20, a GI (Guard interval) removal unit 21, an FFT (Fast Fourier Transform) unit 22, a group separation unit 23, and a communication quality detection unit 24. A propagation path compensation unit 25, a subcarrier demapping unit 26, an interference subcarrier detection unit 27, a user interface unit 28, a display unit 29, and an input unit 30.

  The high frequency signal transmitted from the counterpart station is received by the antenna 19, and the baseband OFDM symbol is generated by the RF unit 18. The baseband OFDM symbol is input to the synchronization unit 20, and the synchronization unit 20 performs correlation processing between the guard interval inserted at the head of the baseband OFDM symbol and the OFDM symbol, and detects the head of the OFDM symbol.

  The GI removal unit 21 removes the guard interval by cutting out the OFDM symbol from the head detected by the synchronization unit 20. The OFDM symbol from which the guard interval has been removed is input to the FFT unit 22. The FFT unit 22 converts the input OFDM symbol from a time domain signal to a frequency domain signal and outputs it to the group separation unit 23.

  In the group separation unit 23, the OFDM symbol converted into the frequency domain signal by the FFT unit 22 is separated into the data symbol and the pilot symbol from the OFDM symbol divided for each subcarrier group, and the communication quality detection unit 24 and the propagation path compensation To the unit 25.

  The communication quality detection unit 24 detects the communication quality and reception level of each subcarrier based on the data symbols and pilot symbols for each subcarrier group input from the group separation unit 23, and the detected communication quality is subjected to propagation path compensation. And outputs the detected reception level to the user interface unit 28, respectively.

  In the present embodiment, as communication quality, an equalization error (equalization coefficient) used when equalization processing is performed in the communication quality detection unit 24 is detected, and the detected equalization error is detected as a propagation path compensation unit. 25, to the interference subcarrier detection unit 27 and the user interface unit 28, respectively. The equalization error (equalization coefficient) is a value calculated based on propagation path information estimated for each subcarrier based on the output of the FFT unit 22 when a pilot symbol is input, and is detected for each subcarrier. Is done. In addition, the communication quality detection unit 24 detects a phase error due to phase noise or the like and outputs it to the propagation path compensation unit 25. The phase error is calculated for each subcarrier to which a pilot symbol is assigned, for example.

  The propagation path compensation unit 25 performs equalization processing on the data symbol based on the communication quality detected by the communication quality detection unit 24, that is, the equalization error (equalization coefficient), and also performs phase compensation based on the phase error. And do.

  The data symbol subjected to equalization processing and phase error compensation is input to the subcarrier demapping unit 26. The subcarrier demapping unit 26 performs demapping processing, and the received data that is digital data is output from the subcarrier demapping unit 26.

  The jamming subcarrier detection unit 27 detects a jamming subcarrier whose communication quality is deteriorated based on the communication quality for each subcarrier input from the communication quality detection unit 24, that is, an equalization error (equalization coefficient). . The detection of jamming subcarriers is performed by comparing the communication quality with a preset first threshold, and subcarriers whose equalization error is worse than the first threshold are regarded as jamming subcarriers. The detected subcarrier group to which the detected disturbing subcarrier belongs is notified to the group control unit 11. As a method for detecting the interference subcarrier, the equalization error is not simply compared with the first threshold value, but the equalization error is continuously deteriorated from the first threshold value a predetermined number of times. When the average of the predetermined number of equalization errors is worse than the first threshold, it may be detected as a disturbing subcarrier.

  The group control unit 11 sets the subcarrier group notified from the disturbing subcarrier detection unit 27 as an unused subcarrier group that is not used for data transmission, and notifies the user interface unit 28 of the unused subcarrier group. . Thereby, in the group control part 11, subcarrier groups other than an unused subcarrier group are set as a use subcarrier group.

  An input unit 30 such as a keyboard and a mouse and a display unit 29 such as a liquid crystal display are connected to the user interface unit 28, and belong to the subcarrier group and the subcarrier group based on an instruction from the input unit 30. A status notification screen 40 and a detailed display screen 50 shown in FIGS. 2 and 3 for visually informing the user of the communication quality of the subcarrier, that is, the equalization error, are generated and displayed on the display unit 29, respectively.

  When the user interface unit 28 displays a menu screen (not shown) on the display unit 29 and is instructed to display the status notification screen 40 from the input unit 30 on the menu screen, the communication quality input from the communication quality detection unit 24 is displayed. Based on the reception level, the state notification screen 40 shown in FIG. 2 is generated and displayed on the display unit 29. On the status notification screen 40, the horizontal axis indicates the subcarrier group number and the vertical axis indicates the state of the subcarrier group, that is, the group status notification screen 41 showing the communication quality as a bar graph, and the switching to the detailed display screen 50 is instructed. A detailed display button 42 is provided for the purpose. In this embodiment, one subcarrier group is composed of 7 subcarriers, and the state of 840/7 = 120 subcarrier groups is displayed for all 840 subcarriers.

  In the status notification screen 40, the communication quality of the subcarrier group, that is, the equalization error is represented by a color on the bar graph. That is, the user interface unit 28 is performed by comparing the equalization error input from the communication quality detection unit 24 with a preset second threshold value, and the equalization error is worse than the second threshold value. The detected subcarrier is detected as a disturbing subcarrier, and the color of the subcarrier group to which the detected disturbing subcarrier belongs (for example, red) is the color of the subcarrier group to which the disturbing subcarrier does not belong (for example, green). Display them separately. In addition, as a detection method of the interference subcarrier, the equalization error is not simply compared with the second threshold value, but the equalization error is continuously deteriorated from the second threshold value a predetermined number of times. When the average of the predetermined number of equalization errors is worse than the second threshold value, it may be detected as a disturbing subcarrier. Further, the first threshold value used for detecting the jamming subcarrier in the jamming subcarrier detection unit 27 and the second threshold value used for detecting the jamming subcarrier in the user interface unit 28 are set to the same value. The disturbing subcarrier detection unit 27 and the user interface unit 28 may detect the disturbing subcarrier under the same conditions. However, the disturbing subcarrier detection unit 27 detects the disturbing subcarrier in a state where the equalization error is worse than that of the user interface unit 28 by making the first threshold value and the second threshold value different from each other. If configured, equalization errors can be monitored according to different criteria, which is preferable.

  When the detail display button 42 on the status notification screen 40 is operated by the input unit 30, the user interface unit 28 generates the detail display screen 50 shown in FIG. 3 based on the communication quality input from the communication quality detection unit 24. And displayed on the display unit 29. The detailed display screen 50 includes a subcarrier status notification screen 51 for reporting a list of communication quality of all subcarriers in a state where the subcarrier group to which the user belongs can be identified, and a usage instruction screen for instructing use / non-use of the subcarrier group 52 are arranged.

  The subcarrier status notification screen 51 expresses all subcarriers in a tile shape and is arranged in units of subcarrier groups, and the detected disturbing subcarrier color (for example, red) is the normal subcarrier color (for example, red). , Green). Accordingly, the user can easily grasp which subcarrier belonging to which subcarrier group is detected as an interfering subcarrier.

  The use instruction screen 52 displays the used subcarrier group display area 53 in which the number of the used subcarrier group set by the group control unit 11 is displayed, and the number of the unused subcarrier group set by the group control unit 11. Used subcarrier group display area 54, a nonuse setting button 55 for setting an unused subcarrier group, and a use setting button 56 for setting a used subcarrier group.

  In the used subcarrier group display area 53, the number of the used subcarrier group set by the group control unit 11 is displayed, and the number of the used subcarrier group displayed in the used subcarrier group display area 53 by the input unit 30 is displayed. When designated and the unused setting button 55 is operated, the designated used subcarrier group is notified from the user interface unit 28 to the group control unit 11 as an unused subcarrier group, and the group control unit 11 Set as an unused subcarrier group not used for transmission.

  The unused subcarrier group display area 54 displays the number of unused subcarrier groups set by the group control unit 11, and the unused subcarrier group display area 53 displayed by the input unit 30. When the use setting button 56 is operated by designating a subcarrier group number, the designated unused subcarrier group is notified to the group control unit 11 from the user interface unit 28 as a used subcarrier group, and the group control unit 11 is set as a used subcarrier group used for data transmission. In the present embodiment, switching from the unused subcarrier group to the used subcarrier group is possible only by an instruction from the input unit 30 using the usage instruction screen 52. As a result, since the user can determine whether or not to switch to the used subcarrier group after determining the state of the disturbing subcarrier, the subcarrier group whose detection is periodically repeated as a disturbing subcarrier is always disabled. It can be set as a used subcarrier group, and a reduction in communication quality can be prevented.

  In the used subcarrier group display area 53 and the unused subcarrier group display area 54, the color of the number of the subcarrier group to which the disturbing subcarrier belongs (for example, red) is set to the number of the subcarrier group to which the disturbing subcarrier does not belong. It may be displayed separately from the color (for example, green). Thereby, the use / non-use of the subcarrier group using the use instruction screen 52 can be instructed without making a mistake in the designated subcarrier group.

  In the present embodiment, the jamming subcarrier detection unit 27 detects the jamming subcarrier and automatically sets the unused subcarrier group without any instruction from the user. The function of the disturbing subcarrier detection unit 27 may be turned on / off by an instruction from

  In this embodiment, the equalization error is detected as the communication quality of the subcarrier. However, for example, the C / N value based on the measured value of RSSI (Received Signal Strength Indicator) is used as the communication quality. In a communication method using a method (FEC (Forward Error Correction) method) for correcting an error by error correction coding and error correction decoding, the received signal modulation method and FEC ( A C / N value converted based on a BER (Bit Error Rate) before error correction may be detected as communication quality.

  As described above, in the radio apparatus according to the present invention, the communication quality detection unit 24 that detects the communication quality of a plurality of subcarriers, and the communication quality of the plurality of subcarriers detected by the communication quality detection unit 24, respectively. A subcarrier state notification screen 51 for reporting the list of subcarrier groups in a state where the subcarrier group to which the subcarrier group belongs can be generated, and a use instruction screen 52 for instructing use / non-use of the subcarrier group. The user interface unit 28 that displays the state notification screen 51 and the usage instruction screen 52 on the display unit 30 on the same screen, the input unit 30 that receives an instruction to use / not use the subcarrier group based on the usage instruction screen 52, and the input unit 30 is used for data transmission based on the subcarrier group use / nonuse instruction received by By providing a carrier control unit 11 that sets a subcarrier group as a used subcarrier group, and by allocating and transmitting data to the used subcarrier group set by the carrier control unit 11, The user can easily grasp the communication quality status of each subcarrier, and the user can set a used subcarrier group used for data transmission and an unused subcarrier group not used for data transmission.

  Further, in the radio apparatus according to the present invention, a disturbing subcarrier whose communication quality has deteriorated is detected based on the communication quality detected by the communication quality detection unit 24, and is detected on the subcarrier status notification screen 51. The interference subcarrier color and the normal subcarrier color are displayed separately. Thereby, the communication quality of a some subcarrier can be grasped | ascertained visually easily.

  In the radio apparatus according to the present invention, the communication quality detection unit 24 is configured to detect an equalization error as the communication quality.

  Further, in the radio apparatus according to the present invention, based on the communication quality for each subcarrier detected by the communication quality detection unit 24, a disturbing subcarrier whose communication quality is deteriorated is detected, and the disturbing subcarrier is detected. A jamming subcarrier detection unit 27 is provided for notifying the subcarrier group to which the subcarrier group belongs to the carrier control unit 11, and the group control unit 11 uses the subcarrier group from the jamming subcarrier detection unit 27 not to use the subcarrier group for data transmission. It is configured to be set as a carrier group.

  In the radio apparatus according to the present invention, switching from a subcarrier group that is not used for data transmission to a used subcarrier group can be performed only by an instruction from the input unit 30 using the usage instruction screen 52. It has become. As a result, since the user can determine whether or not to switch to the used subcarrier group after determining the state of the disturbing subcarrier, the subcarrier group whose detection is periodically repeated as a disturbing subcarrier is always disabled. It can be set as a used subcarrier group, and a reduction in communication quality can be prevented.

  Note that the present invention is not limited to the above-described embodiments, and it is obvious that the embodiments can be appropriately changed within the scope of the technical idea of the present invention. In addition, the number, position, shape, and the like of the constituent members are not limited to the above-described embodiment, and can be set to a suitable number, position, shape, and the like in practicing the present invention. In each figure, the same numerals are given to the same component.

DESCRIPTION OF SYMBOLS 1 Radio apparatus 11 Group control part 12 Data division part 13 Subcarrier mapping part 14 Pilot production | generation part 15 Group arrangement part 16 IFFT part 17 GI insertion part 18 RF part 19 Antenna 20 Synchronization part 21 GI removal part 22 FFT part 23 Group separation part 24 Communication quality detection unit 25 Propagation path compensation unit 26 Subcarrier demapping unit 27 Interference subcarrier detection unit 28 User interface unit 29 Display unit 30 Input unit 40 Status notification screen 41 Group status notification screen 42 Detailed display button 50 Detailed display screen 51 Subcarrier status notification screen 52 Usage instruction screen 53 Used subcarrier group display area 54 Unused subcarrier group display area 55 Unused setting button 56 Used setting button

Claims (4)

A wireless device that divides a given frequency band into a plurality of subcarrier groups composed of a plurality of orthogonal subcarriers, assigns data to the subcarrier groups, and performs transmission.
Communication quality detection means for detecting the communication quality of each of the plurality of subcarriers;
Generating a subcarrier status notification screen for reporting the list of the communication qualities of the plurality of subcarriers detected by the communication quality detection means in a state where the subcarrier group to which the subcarrier group belongs can be identified; Generating a use instruction screen for instructing use / non-use of the state, and displaying the subcarrier state notification screen and the use instruction screen on a display unit on the same screen;
Input means for receiving an instruction to use or not use the subcarrier group based on the use instruction screen displayed on the display means;
Group control means for setting a used subcarrier group used for data transmission and an unused subcarrier group not used for data transmission based on the use / non-use instruction of the subcarrier group received by the input means; Comprising
A radio apparatus characterized by allocating and transmitting data to the used subcarrier group set by the group control means.   2. The wireless device according to claim 1, wherein a disturbing subcarrier whose communication quality is deteriorated is detected based on the communication quality detected by the communication quality detecting unit, and the detected subcarrier status is displayed on the subcarrier status notification screen. A wireless device configured to display a color and a color of a normal subcarrier separately.   2. The radio apparatus according to claim 1, wherein an equalization error is detected as communication quality by the communication quality detecting means.   2. The radio apparatus according to claim 1, wherein a subcarrier whose communication quality is deteriorated is detected based on the communication quality of each subcarrier detected by the communication quality detection means, and the subcarrier to which the subcarrier belongs. Disturbing subcarrier detection means for notifying the group control means of the group is provided, and the group control means sets the subcarrier group from the disturbing subcarrier detection means as an unused subcarrier group that is not used for data transmission. It is comprised by the radio | wireless apparatus characterized by the above-mentioned.

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