JP2008252491A - Broadcast wave reception system and software radio - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a broadcast wave reception system 1, or the like capable of improving performance in diversity or adaptive reception in a broadcast wave receiver 14b. <P>SOLUTION: A software radio 16b that is connected to the broadcast wave receiver 14b and enables communication between vehicles and a vehicle-to-vehicle communication section 18b connected to the software radio 16b are installed at the side of a vehicle 10b. The same installation is also performed at the side of a vehicle 10a. A radio processing section 16b-2 of the software radio 16b merges a radio signal RF of broadcast waves R subjected to diversity or adaptive reception by the broadcast wave receiver 14b, and a signal that is the radio signal RF of the same broadcast waves R subjected to diversity or adaptive reception by the broadcast wave receiver 14a of other on-vehicle devices 10a driving in parallel and is transmitted by vehicle-to-vehicle communication com-ab from other vehicles 10a for diversity or adaptive reception processing. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a broadcast wave reception system between vehicles having a broadcast wave receiver capable of diversity reception or adaptive reception, and a software defined radio used in the broadcast wave reception system.

  In broadcast reception in a mobile reception environment, for example, reception of television broadcast waves by an in-vehicle television, the received signal often deteriorates significantly due to rapid fluctuations in radio wave propagation due to fading. For this reason, diversity reception or adaptive reception technology using a plurality of antennas has been often used.

  In the above-described adaptive reception technology, antennas of a plurality of elements are arranged, and even when the direction of arrival of the received wave is unknown or temporally changes, the beams of the plurality of antennas are automatically followed to achieve a desired communication partner or communication. The antenna directing surface can be directed toward the area. However, when installed in a vehicle, the maximum number of antennas is four, and it is difficult to increase the physical spacing between the plurality of antennas. For this reason, there is a limit to the improvement in reception performance due to diversity reception or adaptive reception effect in the in-vehicle device (in-vehicle receiver).

  In order to improve the reception by the vehicle-mounted device as described above, there is a vehicle-mounted information device for traffic information (see Patent Document 1). In this in-vehicle information device, the received traffic information is broadcast as reference traffic information using inter-vehicle communication, and the appropriateness of the traffic information received by the own vehicle is investigated using the reference traffic information received from other vehicles. The method is used.

JP 2004-139510 A

  As described above, the in-vehicle information device described in Patent Document 1 uses a method for investigating the appropriateness of traffic information received by the host vehicle by using inter-vehicle communication. However, even if this method is used, the reception performance itself by the in-vehicle device (in-vehicle receiver) is not improved, so that it is impossible to improve diversity reception or adaptive reception performance in the in-vehicle device (in-vehicle receiver). There was a problem.

  Accordingly, an object of the present invention has been made to solve the above-described problem, and a broadcast wave receiving system and software radio capable of improving diversity reception or adaptive reception performance in an in-vehicle device (on-vehicle receiver). Is to provide a machine.

  The broadcast wave receiving system of the present invention is a broadcast wave receiving system between vehicles having a broadcast wave receiver capable of diversity reception or adaptive reception, and the vehicle is connected to the receiver and is a software defined radio capable of vehicle-to-vehicle communication The software defined radio includes: a broadcast wave radio signal received by the broadcast wave receiver with diversity reception or adaptive reception; and a broadcast wave receiver of another in-vehicle device that receives the same broadcast wave with diversity reception or adaptive reception. Radio processing means for performing diversity reception or adaptive reception processing in combination with radio signals transmitted from other vehicles by inter-vehicle communication, intermediate frequency signals converted from radio signals by the broadcast wave receiver, and others The on-board broadcast wave receiver uses an intermediate frequency signal converted from a radio signal for the same broadcast wave. The intermediate frequency processing means for processing together with the one transmitted from the other vehicle by inter-vehicle communication, the baseband signal converted from the intermediate frequency signal by the broadcast wave receiver, and the broadcast wave of the other in-vehicle device A baseband processing means for processing a baseband signal converted from an intermediate frequency signal for the same broadcast wave and transmitted from another vehicle by inter-vehicle communication, and the broadcast wave receiver The data signal converted from the band signal is combined with the data signal demodulated from the baseband signal for the same broadcast wave by the broadcast wave receiver of the other in-vehicle device and transmitted from the other vehicle by inter-vehicle communication. One or more of the data processing means for processing in response to the signal transmitted by the inter-vehicle communication from another vehicle, the wireless processing means, During frequency processing means, characterized in that a control means for executing any one or more of said baseband processing unit and the data processing means.

  Here, in the broadcast wave receiving system of the present invention, the software defined radio is any one of a broadcast wave radio signal, an intermediate frequency signal, a baseband signal, or a data signal received by the broadcast wave receiver with diversity reception or adaptive reception. One or more may be dynamically selected according to a band that can be used in vehicle-to-vehicle communication, and a transmission unit that transmits the selected signal to another vehicle through vehicle-to-vehicle communication may be further provided.

  The software defined radio of the present invention is a software defined radio capable of vehicle-to-vehicle communication connected to a broadcast wave receiver capable of diversity reception or adaptive reception, wherein the broadcast wave receiver receives diversity waves or adaptively received broadcast waves. Diversity reception or adaptive combination of a radio signal and a radio signal of the same broadcast wave that has been diversity-received or adaptively received by a broadcast wave receiver of another in-vehicle device and transmitted from the other vehicle by inter-vehicle communication Radio processing means for receiving and processing, an intermediate frequency signal converted from a radio signal by the broadcast wave receiver, and an intermediate frequency signal converted from a radio signal for the same broadcast wave by a broadcast wave receiver of another in-vehicle device. Intermediate frequency processing means for processing together with the vehicle transmitted from the vehicle by inter-vehicle communication, The baseband signal converted from the intermediate frequency signal by the transmission receiver and the baseband signal converted from the intermediate frequency signal for the same broadcast wave by the broadcast wave receiver of the other in-vehicle device, and the inter-vehicle communication from the other vehicle Baseband processing means for processing together with the one transmitted by the broadcast wave receiver, the data signal converted from the baseband signal by the broadcast wave receiver, and the broadcast wave receiver of another in-vehicle device from the baseband signal for the same broadcast wave Any one or more processing means of data processing means for processing the demodulated data signal together with the signal transmitted from the other vehicle by inter-vehicle communication, and transmitted from another vehicle by inter-vehicle communication Depending on the signal, one or more of the wireless processing unit, the intermediate frequency processing unit, the baseband processing unit, or the data processing unit are executed. Characterized in that a control means.

  Here, in the software defined radio of the present invention, any one or more of a broadcast wave radio signal, an intermediate frequency signal, a baseband signal, or a data signal received by the broadcast wave receiver through diversity reception or adaptive reception is communicated between vehicles. Transmission means for dynamically selecting according to an available band and transmitting the selected signal to another vehicle by inter-vehicle communication can be further provided.

  According to the broadcast wave receiving system and the like of the present invention, a vehicle-to-vehicle communication wireless device connected to a broadcast wave receiver and a vehicle-to-vehicle communication unit connected to the software wireless device are installed on the vehicle side. Similarly, on the other vehicle side, a vehicle-to-vehicle communication device connected to the broadcast wave receiver and a vehicle-to-vehicle communication unit connected to the software wireless device are installed. Each vehicle performs inter-vehicle communication via the inter-vehicle communication unit. The software radio signal processing unit of the software defined radio stores various processing units (software parts) such as a radio processing unit, an intermediate frequency processing unit, a baseband processing unit, a data processing unit, a control unit, and a transmission unit. The wireless processing unit wirelessly transmits the radio signal RF of the broadcast wave R that is received by the broadcast wave receiver with diversity reception or adaptively, and the radio signal RF of the same broadcast wave R that is received by the broadcast wave receiver of another in-vehicle device running in parallel with the diversity reception or adaptively. Diversity reception or adaptive reception processing is performed in combination with the signal RF that is transmitted from another vehicle by inter-vehicle communication. That is, diversity reception or adaptive reception processing is performed by adding the radio signal RF received by the antenna (s) of the other vehicle to the radio signal RF received by the antenna (s) of the own vehicle. By exchanging broadcast reception signals between vehicles that receive the same broadcast wave R using inter-vehicle communication, an increase in the number of antenna branches that could not be realized by a single vehicle and an increase in the physical interval between branches Can be made possible. For this reason, the diversity reception or adaptive reception effect can be enhanced, and the influence of fading unique to the mobile reception environment can be reduced. As a result, it is possible to improve diversity reception or adaptive reception performance in the broadcast wave receiver (on-vehicle receiver).

  Hereinafter, each embodiment will be described in detail with reference to the drawings.

  FIG. 1 shows a broadcast wave receiving system 1 in Embodiment 1 of the present invention. In FIG. 1, reference numeral 20 denotes a broadcast station side antenna that radiates a broadcast wave R such as a television broadcast wave, 10a, 10b, and 10c are vehicles, and 12a, 12b, and 12c are the same broadcast waves from the broadcast station side antenna 20, respectively. In order to receive R in diversity reception or adaptive reception, a plurality of antennas 14a, 14b, and 14c installed in vehicles 10a, 10b, and 10c are connected to antennas 12a, 12b, and 12c, respectively. Broadcast wave receivers 16a, 16b and 16c capable of receiving processing are software defined radios connected to the broadcast wave receivers 14a, 14b and 14c, respectively. In FIG. 1, reference symbol com-ab denotes inter-vehicle communication between vehicles 10 a and 10 b, com-bc denotes inter-vehicle communication between vehicles 10 b and 10 c, and com-ac denotes a vehicle between vehicles 10 a and 10 c. Indicates inter-vehicle communication. As shown in FIG. 1, the vehicles 10a, 10b, and 10c can perform inter-vehicle communication with each other. Although only three vehicles are shown in FIG. 1, the number of vehicles is not limited, and if there are n vehicles, the vehicle 10a can perform inter-vehicle communication with other n-1 vehicles. It is.

  Next, the broadcast wave receiving system 1 will be described by taking the space between the vehicles 10a and 10b as an example. FIG. 2 is a diagram for explaining the function of the broadcast wave receiving system 1 taking the space between the vehicles 10a and 10b as an example. In FIG. 2, the same reference numerals as those in FIG. The upper part of FIG. 2 shows a processing block diagram of the broadcast wave receiver 14a. The broadcast wave R is received by an antenna 12a (a plurality of antennas of about four at most), and the received radio signal (RF signal) is RF processed. Is converted into an IF signal (intermediate frequency signal) by the unit 14a-1, the IF signal is converted into a BB signal (baseband signal) by the IF processing unit 14a-2, and the BB signal is converted by the baseband processing unit 14a-3. Demodulated to a DATA signal (data signal).

  The central part of FIG. 2 shows a processing block diagram of the broadcast wave receiver 14b. Like the broadcast wave receiver 14a, the broadcast wave R is received and received by the antenna 12b (about four antennas at most). The radio signal is converted into an IF signal by the RF processing unit 14b-1, the IF signal is converted into a BB signal by the IF processing unit 14b-2, and the BB signal is demodulated into a DATA signal by the baseband processing unit 14b-3. Is done.

  The lower part of FIG. 2 shows a software defined radio 16b connected to the broadcast wave receiver 14b and an inter-vehicle communication unit 18b connected to the software defined radio 16b. The software defined radio 16b can perform vehicle-to-vehicle communication via the vehicle-to-vehicle communication unit 18b. Although not shown in FIG. 2 for convenience of drawing, a software radio 16a (not shown) connected to the broadcast wave receiver 14a and vehicle-to-vehicle communication connected to the software radio 16a are also shown on the vehicle 10a side. A portion 18a (not shown) is installed. The software defined radio 16a can perform inter-vehicle communication via the inter-vehicle communication unit 18a, and the vehicles 10b and 10a can perform inter-vehicle communication com-ab via the inter-vehicle communication units 18b and 18a. In the following, the software radio 16b and the vehicle-to-vehicle communication unit 18b on the vehicle 10b side will be described. However, the functions of the software radio 16a and the vehicle-to-vehicle communication unit 18a on the vehicle 10a side are the same, and therefore the description on the vehicle 10a side. Is omitted. As the inter-vehicle communication com-ab, for example, dedicated short range communication (DSRC) is suitable.

  In FIG. 2, reference numeral 16b-1 denotes a CPU of the software defined radio 16b, which is connected to the software defined radio signal processing unit 16-bdsp via a bus 16b-b. The software radio signal processing unit 16-bdsp can be created by, for example, an FPGA (Field Programmable Gate Array) which is a device whose circuit configuration can be changed by software rewriting. The software radio signal processing unit 16-bdsp includes a radio processing unit (radio processing unit) 16b-2 and an intermediate frequency processing unit (intermediate frequency processing unit) 16b-, which are various processing units (software parts) described below. 3, one or more processing units of a baseband processing unit (baseband processing unit) 16b-4 and a data processing unit (data processing unit) 16b-5, a control unit (control unit) 16b-6, and a transmission unit ( Transmission means) 16b-7. The CPU 16b-1 performs execution control of each of the above processing units recorded in the software radio signal processing unit 16-bdsp, control of the inter-vehicle communication unit 18b, and the like. Hereinafter, each processing unit and the like will be described in order.

  In the radio processing unit 16b-2, the radio signal RF of the broadcast wave R received by the broadcast wave receiver 14b with diversity reception or adaptively received and the broadcast wave receiver 14a of the other in-vehicle device 10a running in parallel received diversity reception or adaptive reception. Diversity reception processing or adaptive reception processing is performed in combination with a radio signal RF of the same broadcast wave R that is transmitted from another vehicle 10a by inter-vehicle communication com-ab. That is, diversity reception or adaptive reception processing is performed by adding the radio signal RF received by the antenna 12a (plurality) to the radio signal RF received by the antenna 12b (plurality). By sharing the radio signal RF (broadcast reception signal) between the vehicles 10a and 10b that receive the same broadcast wave R using the inter-vehicle communication com-ab, the number of antenna branches that could not be realized by the vehicle 10b alone. And increasing the physical spacing between branches. For this reason, the diversity reception or adaptive reception effect can be enhanced, and the influence of fading unique to the mobile reception environment can be reduced. As a result, it is possible to improve diversity reception or adaptive reception performance in the broadcast wave receiver 14b (on-vehicle receiver).

  In the above description, it is assumed that the vehicle 10a receives the same broadcast wave R as the vehicle 10b. However, it is not always necessary to receive the same broadcast wave R from the beginning. When the broadcast wave receiver 14a is not in operation or receives another broadcast wave, the broadcast wave R is received in response to a request by the inter-vehicle communication com-ab from the vehicle 10b side. May be. Alternatively, when there is a surplus RF signal processing resource on the vehicle 10a side, a request by the inter-vehicle communication com-ab may be received from the vehicle 10b side, and the broadcast wave R may be received by the surplus RF signal processing resource.

  Data exchanged by the inter-vehicle communication com-ab is not limited to the RF signal, but may be any one or more of an IF signal, a BB signal, and a DATA signal (demodulation information). The intermediate frequency processing unit 16b-3 is an IF signal converted from the RF signal by the broadcast wave receiver 14b and an IF signal converted from the RF signal for the same broadcast wave R by the broadcast wave receiver 14a of the other in-vehicle device 10a. Then, the intermediate frequency processing is performed in combination with the one transmitted from the other vehicle 10a by the inter-vehicle communication com-ab.

  The baseband processing unit 16b-4 is a BB signal converted from the IF signal by the broadcast wave receiver 14b, and a BB signal converted from the IF signal for the same broadcast wave R by the broadcast wave receiver 14a of the other in-vehicle device 10a. Then, baseband processing is performed in combination with that transmitted from the other vehicle 10a by inter-vehicle communication com-ab.

  The data processing unit 16b-5 includes a DATA signal demodulated from the BB signal by the broadcast wave receiver 14b and a DATA signal demodulated from the BB signal by the broadcast wave receiver 14a of the other in-vehicle device 10a for the same broadcast wave R. Data processing is performed together with data transmitted from the other vehicle 10a by inter-vehicle communication com-ab.

  In response to signals (RF signal, IF signal, BB signal, DATA signal) transmitted from the other vehicle 10a through the inter-vehicle communication com-ab, the control unit 16b-6 performs the radio processing unit 16b-2, the intermediate frequency processing. Control to execute any one or more of the unit 16b-3, the baseband processing unit 16b-4, and the data processing unit 16b-5 is performed. That is, the number of data signals to be processed is not necessarily one (one system).

  In the above description, it has been assumed that the software defined radio 16b side receives from the software defined radio 16a side, but conversely, the software defined radio 16b side is also a transmitting side. The transmitter 16b-7 can use any one or more of the RF signal, IF signal, BB signal, and DATA signal of the broadcast wave that the broadcast wave receiver 14b receives diversity reception or adaptive reception in the inter-vehicle communication com-ab. A process of dynamically selecting according to the band and transmitting the selected signal to the other vehicle 10a by inter-vehicle communication com-ab is performed. As a result, both software defined radios 16b and 16a exchange signals (RF signal, IF signal, BB signal, DATA signal) by the inter-vehicle communication com-ab. The number of signals to be exchanged is not necessarily one (one system). By exchanging signals as described above, the same broadcast wave R can be received in a coordinated manner, and the reception performance can be improved together. For example, the same broadcast wave R can be received in a coordinated manner by a plurality of vehicles running in parallel on a highway. When the own vehicle enters the tunnel and the reception state is deteriorated, it is also possible to receive the broadcast wave R in cooperation with another vehicle outside the tunnel.

  As described above, according to the first embodiment of the present invention, the software defined radio 16b connected to the broadcast wave receiver 14b and the inter-vehicle communication unit 18b connected to the software defined radio 16b are installed on the vehicle 10b side. Similarly, a software defined radio 16a connected to the broadcast wave receiver 14a and an inter-vehicle communication unit 18a connected to the software defined radio 16a are installed on the vehicle 10a side. The software defined radio 16b and the software defined radio 16a can perform inter-vehicle communication com-ab via the vehicle-to-vehicle communication units 18b and 18a, respectively. The software defined radio signal processing unit 16-bdsp of the software defined radio 16b includes at least one of a radio processing unit 16b-2, an intermediate frequency processing unit 16b-3, a baseband processing unit 16b-4, and a data processing unit 16b-5. And various processing units (software portions) of the control unit 16b-6 and the transmission unit 16b-7 are recorded. In the radio processing unit 16b-2, the radio signal RF of the broadcast wave R received by the broadcast wave receiver 14b with diversity reception or adaptively received and the broadcast wave receiver 14a of the other in-vehicle device 10a running in parallel received diversity reception or adaptive reception. Diversity reception processing or adaptive reception processing is performed in combination with a radio signal RF of the same broadcast wave R that is transmitted from another vehicle 10a by inter-vehicle communication com-ab. That is, diversity reception processing or adaptive reception processing is performed by adding the radio signal RF received by the antenna 12a (plurality) to the radio signal RF received by the antenna 12b (plurality). By exchanging broadcast reception signals between the vehicles 10a and 10b that receive the same broadcast wave R using the inter-vehicle communication com-ab, the number of antenna branches that cannot be realized by the vehicle 10b alone and between the branches are increased. It is possible to increase the physical distance between the two. For this reason, the diversity reception or adaptive reception effect can be enhanced, and the influence of fading unique to the mobile reception environment can be reduced. As a result, it is possible to improve diversity reception or adaptive reception performance in the broadcast wave receiver 14b (on-vehicle receiver).

  As an application example of the present invention, there is an application to a broadcast reception system for automobiles, for example, a road traffic information distribution system using one seg or FM broadcast which is a service for receiving only one segment part for mobile terminals.

It is a figure which shows the broadcast wave receiving system 1 in Example 1 of this invention. It is a figure for demonstrating the function of the broadcast wave reception system 1 which took between the vehicles 10a and 10b as an example.

Explanation of symbols

1 broadcast wave receiving system, 10a, 10b, 10c vehicle, 12a, 12b, 12c antenna, 14a, 14b, 14c broadcast wave receiver, 14a-1, 14b-1 RF processing unit, 14a-2, 14b-2 IF processing 14a-3, 14b-3 baseband processing unit, 16a, 16b, 16c software radio, 16b-1 CPU, 16b-2 radio processing unit, 16b-3 intermediate frequency processing unit, 16b-4 baseband processing unit 16b-5 data processing unit, 16b-6 control unit, 16b-7 transmission unit, 16b-dsp software radio signal processing unit, 18b inter-vehicle communication unit, 20 broadcasting station side antenna.

Claims (4)

A broadcast wave receiving system between vehicles having a broadcast wave receiver capable of diversity reception or adaptive reception, the vehicle comprising a software defined radio connected to the receiver and capable of inter-vehicle communication,
The software defined radio is
The broadcast wave radio signal received by the broadcast wave receiver with diversity reception or adaptive reception and the broadcast wave receiver of the other vehicle-mounted device with the same broadcast wave radio signal received by diversity reception or adaptive reception from the other vehicle Radio processing means for performing diversity reception or adaptive reception processing in combination with those transmitted by inter-vehicle communication,
An intermediate frequency signal converted from a radio signal by the broadcast wave receiver and an intermediate frequency signal converted from a radio signal by the broadcast wave receiver of another in-vehicle device for the same broadcast wave, and from other vehicles by inter-vehicle communication Intermediate frequency processing means for processing together with the transmitted one,
The baseband signal converted from the intermediate frequency signal by the broadcast wave receiver and the baseband signal converted from the intermediate frequency signal for the same broadcast wave by the broadcast wave receiver of the other in-vehicle device between the other vehicle and the vehicle Baseband processing means for processing together with those transmitted by communication,
A data signal converted from the baseband signal by the broadcast wave receiver and a data signal demodulated from the baseband signal by the broadcast wave receiver of the other in-vehicle device from the baseband signal for the same broadcast wave, from the other vehicle by inter-vehicle communication Any one or more processing means of data processing means for processing together with the transmitted ones;
Control means for executing one or more of the wireless processing means, the intermediate frequency processing means, the baseband processing means, or the data processing means in response to a signal transmitted from another vehicle by inter-vehicle communication. A broadcast wave receiving system characterized by comprising.   2. The broadcast wave receiving system according to claim 1, wherein the software defined radio is any one of a broadcast wave radio signal, an intermediate frequency signal, a baseband signal, or a data signal received by the broadcast wave receiver with diversity reception or adaptive reception. A broadcast wave receiving system, further comprising: a transmission unit that dynamically selects the above according to a band that can be used in vehicle-to-vehicle communication and transmits the selected signal to another vehicle through vehicle-to-vehicle communication. A software defined radio capable of inter-vehicle communication connected to a broadcast wave receiver capable of diversity reception or adaptive reception,
The broadcast wave radio signal received by the broadcast wave receiver with diversity reception or adaptive reception and the broadcast wave receiver of the other vehicle-mounted device with the same broadcast wave radio signal received by diversity reception or adaptive reception from the other vehicle Radio processing means for performing diversity reception or adaptive reception processing in combination with those transmitted by inter-vehicle communication,
An intermediate frequency signal converted from a radio signal by the broadcast wave receiver and an intermediate frequency signal converted from a radio signal by the broadcast wave receiver of another in-vehicle device for the same broadcast wave, and from other vehicles by inter-vehicle communication Intermediate frequency processing means for processing together with the transmitted one,
The baseband signal converted from the intermediate frequency signal by the broadcast wave receiver and the baseband signal converted from the intermediate frequency signal for the same broadcast wave by the broadcast wave receiver of the other in-vehicle device between the other vehicle and the vehicle Baseband processing means for processing together with those transmitted by communication,
A data signal converted from the baseband signal by the broadcast wave receiver and a data signal demodulated from the baseband signal by the broadcast wave receiver of the other in-vehicle device from the baseband signal for the same broadcast wave, from the other vehicle by inter-vehicle communication Any one or more processing means of data processing means for processing together with the transmitted ones;
Control means for executing one or more of the wireless processing means, the intermediate frequency processing means, the baseband processing means, or the data processing means in response to a signal transmitted from another vehicle by inter-vehicle communication. A software defined radio characterized by comprising.   4. The software defined radio according to claim 3, wherein any one or more of a broadcast wave radio signal, an intermediate frequency signal, a baseband signal, and a data signal received by the broadcast wave receiver through diversity reception or adaptive reception are used for inter-vehicle communication. A software defined radio characterized by further comprising transmission means for dynamically selecting according to a possible band and transmitting the selected signal to another vehicle by inter-vehicle communication.

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