JP2006333093A - Radio communication equipment, reception method, and computer program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently operate a receiver performing diversity reception. <P>SOLUTION: An input switch 4a switches whether an input to a baseband processor 5a is to be obtained from a receiver 3a or a receiver 3b, while an input switch 4b switches whether an input to a baseband processor 5b is to be obtained from the receiver 3a or the receiver 3b. The receiver 3a or 3b waits for receiving an input radio wave with a different frequency. When there is a first input sensitivity on the receiver 3a or 3b, the receiver 3b or 3a receives the radio wave either of identical frequency to the frequency having the first input sensitivity, or by tuning to a frequency with which communication of an identical content is in progress. For each time measured in a time count section 25, the receiver 3b or 3a not having the first sensitivity performs the reception wait operation for the input radio wave for a certain time, with the above frequency for use in waiting for reception, which is different from the frequency having the first sensitivity. When there is a second input sensitivity on the receiver 3b or 3a, each receiver 3b or 3a receives the radio wave of different frequency. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a wireless communication apparatus that performs diversity reception. More specifically, the present invention relates to a wireless communication apparatus that performs space diversity reception, polarization diversity reception, or frequency diversity reception.

In general, two sets of receivers are required to perform diversity reception. Some wireless communication apparatuses include two sets of receivers for the purpose of receiving two frequencies simultaneously. A wireless communication apparatus having a conventional two-wave receiving circuit cannot perform diversity reception using the two sets of receivers. In addition, the radio communication apparatus having the diversity function cannot perform two-wave simultaneous reception.
On the other hand, in the FM receiver, for example, in Patent Document 1, it is possible to simultaneously receive two broadcasts having different frequencies, and when receiving only one broadcast, two receiving units are used as a diversity receiver. Discloses a technique for providing a receiving device that operates effectively. That is, in the receiving device, the first and second antenna units are connected to the first and second receiving units, respectively, and the second switching unit performs the second baseband processing on the baseband signal of the second receiving unit. Switching to the first switching unit or the first switching unit, and the first switching unit uses the input to the first baseband processing unit as a baseband signal from the first receiving unit, The output from the second switching unit is switched. The first switching unit is controlled by the output signal of the first determination unit and the switching signal from the switching control unit, and the first and second receiving units The tuning frequency and the second switching unit are controlled by a switching signal from the switching control unit.
However, when diversity reception is performed, two broadcasts having different frequencies cannot be received. This means that the second communication cannot be received even if the second communication occurs during diversity reception.
Japanese Patent Laid-Open No. 10-13277

  The present invention has been made in view of the above circumstances, and reception that performs diversity reception by using two sets of receivers automatically, sometimes for two-wave simultaneous reception, and sometimes for diversity reception. It is an object of the present invention to provide a wireless communication apparatus that efficiently operates a machine.

In order to achieve the above object, a wireless communication apparatus according to a first aspect of the present invention includes first and second receiving units that receive radio waves of the same or different frequencies and output baseband signals, respectively. 1 is a wireless communication apparatus including a first switching unit, a second switching unit, a first baseband processing unit that processes the baseband signal, a time measuring unit that measures a reception time, and a reception frequency control unit. The first switching unit uses the input to the first baseband processing unit as a baseband signal from the first receiving unit or a baseband signal from the second receiving unit. The second switching unit uses the input to the second baseband processing unit as a baseband signal from the first receiving unit, or a baseband signal from the second receiving unit. Switch between
The first and second receiving units wait for input radio waves at different frequencies,
When the first or second receiving unit has a first input sensitivity, the second or first receiving unit without the first input sensitivity has a frequency with the first input sensitivity. Receive in tune with the same frequency or the frequency at which the same content is being communicated,
The standby frequency that is different from the frequency at which the first input sensitivity is different from the frequency at which the second or first reception unit without the first input sensitivity is measured at a predetermined time measured by the timing unit. With the input radio wave waiting for a certain time,
Further, when the second or first receiver has a second input sensitivity, the first and second receivers receive radio waves having different frequencies.

  The wireless communication apparatus includes reception mode selection means for selecting diversity reception or simultaneous two-wave reception, and the reception is performed when the first and second reception units receive or wait for radio waves of different frequencies. When diversity reception is selected by the mode selection means, one of the second or first receiving units is communicating with the same frequency as the frequency received by the other receiving unit or with the same content. You may comprise so that it may receive in synchrony with a frequency.

  When diversity reception is selected by the reception mode selection means, one of the second or first receiving units performs communication with the same frequency as the frequency received by the other receiving unit or the same content. Performing reception tuned to a certain frequency may be muting the output of the baseband processing unit.

  In the wireless communication apparatus, the first and second receiving units receive radio waves having the same frequency or the same frequency of communication, or different frequency radio waves. It is preferable to provide display means for displaying whether or not the message is received.

  In addition, the wireless communication device includes reception signal identification means for identifying the quality of the reception signal received by the first or second reception unit, and the quality of the reception signal having the first input sensitivity is a predetermined threshold. When the value is equal to or lower than the value, the second or first receiving unit that did not have the first input sensitivity performs communication with the same frequency as the frequency with the first input sensitivity or with the same content. You may comprise so that it may tune in and receive to the frequency which is.

Further, the wireless communication device includes a received signal identifying unit that identifies a quality of a received signal received by the first or second receiving unit, and a predetermined time measured by the time measuring unit is set to 2 or more,
When the received signal quality of the frequency having the first input sensitivity exceeds a predetermined threshold value, the second or first receiving unit without the first input sensitivity is the first input sensitivity. Shorten the interval of waiting for input radio waves at the standby frequency different from the frequency with input sensitivity,
When the received signal quality of the frequency having the first input sensitivity is equal to or lower than a predetermined threshold value, the second or first receiving unit without the first input sensitivity is the first input sensitivity. The interval for waiting for an input radio wave at a frequency at the time of standby different from the frequency at which the error occurred may be increased.

  Furthermore, the second or first receiving unit without the first input sensitivity has the first input sensitivity according to the rate of change in the received signal quality of the frequency with the first input sensitivity. The interval for waiting for an input radio wave may be changed at the standby frequency different from the received frequency.

According to a second aspect of the present invention, there is provided a radio communication apparatus receiving method comprising: first and second receiving units that receive radio waves having the same or different frequencies and output baseband signals; A radio communication apparatus comprising: a switching unit; a first and second baseband processing unit that processes the baseband signal; a time measuring unit that measures reception time; and a reception frequency control unit. And
The first switching unit determines whether an input to the first baseband processing unit is a baseband signal from the first receiving unit or a baseband signal from the second receiving unit. And the second switching unit uses the input to the second baseband processing unit as a baseband signal from the first receiving unit or a baseband signal from the second receiving unit. Switch
The first and second receiving units wait for input radio waves at different frequencies,
When the first or second receiving unit has a first input sensitivity, the second or first receiving unit without the first input sensitivity has a frequency with the first input sensitivity. Receive in tune with the same frequency or the frequency at which the same content is being communicated,
The standby frequency that is different from the frequency at which the first input sensitivity is different from the frequency at which the second or first reception unit without the first input sensitivity is measured at a predetermined time measured by the timing unit. In standby for input radio waves,
Further, when the second or first receiver has a second input sensitivity, the first and second receivers receive radio waves having different frequencies.

According to a third aspect of the present invention, there is provided a computer program for receiving first and second receiving means for receiving a radio wave having the same or different frequency and outputting a baseband signal, and first and second A computer program that functions as a wireless communication apparatus comprising switching means, first and second baseband processing means for processing the baseband signal, timing means for measuring reception time, and reception frequency control means. Then, the computer switches whether the input to the first baseband processing means is a baseband signal from the first receiving unit or a baseband signal from the second receiving unit. Switching means,
Second switching means for switching whether the input to the second baseband processing means is a baseband signal from the first receiving section or a baseband signal from the second receiving section;
First and second receiving means for waiting for input radio waves at different frequencies,
When the first or second receiving means has a first input sensitivity, the second or first receiving means without the first input sensitivity has a frequency with the first input sensitivity. Receive in tune with the same frequency or the frequency at which the same content is being communicated,
The standby frequency that is different from the frequency at which the first input sensitivity is different from the frequency at which the second or first reception unit without the first input sensitivity is measured at a predetermined time measured by the timing unit. With the input radio wave waiting for a certain time,
Further, when the second or first receiving means has a second input sensitivity, the first and second receiving means receive the radio waves having different frequencies, respectively. When,
It is characterized by functioning.

  According to the present invention, since the diversity reception is periodically switched to the two-wave simultaneous reception, even when one wave is being received, another one can be received and the two sets of receiving units can be effectively used.

  An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a block diagram showing a configuration of a wireless communication device 30 according to an embodiment of the present invention. The wireless communication device 30 is configured to have one set of transmission function and two sets of reception function.

  When the wireless communication device 30 functions as a transmitter, the wireless communication device 30 transmits an audio signal based on a call sound of a user who uses the wireless communication device 30 or a data signal for data communication toward a receiver of the other party. On the other hand, when the wireless communication device 30 functions as a receiver, the wireless communication device 30 receives a voice signal based on a call sound transmitted to the wireless communication device 30 or data communication transmitted from another wireless communication device 30 that is a counterpart device. The data signal for use is received.

  As shown in FIG. 1, the wireless communication device 30 includes an antenna 1a, 1b, a transmission / reception switching unit 2, a receiving unit 3a, 3b, an input switching unit 4a, 4b, baseband processing, and the like. Sections 5a and 5b, mute circuits 6a and 6b, D / A conversion and amplifiers (hereinafter referred to as D / A conversion sections) 7a and 7b, and speakers 8a and 8b. The wireless communication device 30 also includes a microphone 11, an amplification / A / D converter (hereinafter referred to as an A / D conversion unit) 12, a baseband processing unit 13, and a transmission unit 14 in order to realize a transmission function. It has.

  The wireless communication device 30 further includes a quality identifying unit 15 that identifies the quality of the received signal, a controller 20 that controls each unit, a time measuring unit 25 that measures a reception time, a display unit 26 that displays a reception mode, a reception mode, and the like. The operation unit 27 for inputting the setting is provided.

  The controller 20 controls the operation of the wireless communication device 30. The controller 20 includes, for example, a CPU (central processing unit) 21, an I / O (input / output device) 22, a ROM (read only memory) 24, a RAM (read / write memory) 23, and an internal bus (not shown) for connecting them. ).

  The controller 20 is connected via the I / O 22 to a timer unit 25, a display unit 26, and an operation unit 27 for measuring the switching timing of the reception mode. In order to avoid complication of FIG. 1 and to facilitate understanding, signal lines from the controller 20 to each unit are omitted, but the controller 20 includes a transmission / reception switching unit 2, receiving units 3a and 3b, an input switching unit 4a, 4b, baseband processing units 5a, 5b and 13, mute circuits 6a and 6b, D / A conversion units 7a and 7b, A / D conversion unit 12, transmission unit 14 and quality identification unit 15 connected via I / O 22 The start and end of these processes and the control of the process contents are performed.

  A control program for the controller 20 to control the operation of the wireless communication device 30 is stored in the ROM 24. When the wireless communication device 30 is used as a transmitter, the controller 20 controls the wireless communication device 30 to function as a transmitter. Further, the operation in which the baseband processing unit 13 outputs data for data communication to the transmission unit 14 is performed under the control of the controller 20.

  The RAM 23 of the controller 20 stores data for generating a communication frame transmitted by the wireless communication device 30. For example, the RAM 23 stores local station side identification information and counterpart station side identification information, which are data for configuring the header portion of the communication frame.

  The controller 20 is connected to, for example, a USB (Universal Serial Bus) interface, and data of an external device connected to the USB interface is input to the controller 20. It is also possible to connect a personal computer as an external device to the USB interface and control the wireless communication device 30 by this personal computer.

  The timer unit 25 can use, for example, a subtraction counter that subtracts a counter value by a clock pulse and generates an interrupt output when the counter value becomes zero. When a certain value is set in the counter, a predetermined time can be measured by counting the set number of clock pulses and interrupting the CPU 21.

  The display unit 26 includes a CRT (Cathode Ray Tube), an LCD (Liquid Crystal Display), an LED (Light Emission Diode), or the like, a reception mode in which the wireless communication device 30 receives diversity reception or two-wave reception, and a wireless communication device. 30 other information is displayed.

  The operation unit 27 corresponds to an input unit for inputting condition information regarding the operation of the wireless communication device 30. The operation unit 27 is provided with various operation keys. That is, when the user operates the operation key of the operation unit 27 of the wireless communication device 30 to input the operation condition, the wireless communication device 30 can perform an operation based on the input.

  The contents of the operation on the operation unit 27 are detected by the controller 20. That is, the controller 20 detects the type of the operated operation key and the content of the operation on the operation key. Then, the contents input by the operation key are determined. Then, the controller 20 controls the wireless communication device 30 so as to perform an operation corresponding to the content input by the operation unit 27.

  Depending on the content of the operation of the operation key, the content input by the operation is displayed on the display unit 26. For example, when the reception mode is set to 1-wave diversity reception by the operation unit 27 or when 2-wave reception is set, those reception modes set by the operation unit 27 are displayed on the display unit 26. . Further, the display unit 26 displays a notification of the operating state of the wireless communication device 30 to the user, a message that prompts the user to input by the operation unit 27, and the like.

  A block when the wireless communication device 30 functions as a transmitter will be described. The call sound by the user of the wireless communication device 30 is converted into a voice signal by the microphone 11, and this voice signal is input to the amplifier. The audio signal input to the amplifier is amplified by the amplifier and then converted into a digital signal by audio A / D conversion. The digitally converted signal is input to the baseband processing unit 13. The baseband processing unit 13 assembles digital data into a transmission frame and outputs it to the transmission unit 14.

  The transmitter 14 has a modulation function for modulating the input signal. In the example of the wireless communication device 30, GMSK (Gaussian filtered Minimum Shift Keying), PSK (Phase Shift Keying), QAM (Quadrature Amplitude Modulation), and the like are used as a method by which the transmission unit 14 modulates a signal. When audio is not converted to digital but is transmitted as an analog signal, A / D conversion is not performed. For example, amplitude modulation, frequency modulation, phase modulation, or the like is used as a modulation method. . The transmission unit 14 performs a process of modulating the input audio signal and data signal using these modulation methods.

  The transmission unit 14 outputs the signal subjected to the modulation process to the transmission / reception switching unit 2. When the radio communication device 30 functions as a transmitter, the transmission / reception switching unit 2 is formed with a circuit that guides a signal input from the transmission unit 14 to the antenna 1a. And the signal input into the transmission / reception switching part 2 is output to the antenna 1a, and is transmitted to the receiver which becomes the other party of the radio | wireless communication apparatus 30 from the antenna 1a.

  The baseband processing unit 13 assembles various control signals in order to execute the communication protocol. The operation of the baseband processing unit 13, the start and end of transmission by the transmission unit 14, the selection of frequency, and the like are performed under the control of the controller 20.

  Next, a block when the wireless communication device 30 functions as a receiver will be described. To the wireless communication device 30 as a receiver, a voice signal of a call sound or a data signal for data communication is transmitted from the transmitter of the other party. The signal transmitted to the wireless communication device 30 constitutes a communication frame.

  The antennas 1 a and 1 b receive radio signals transmitted to the radio communication device 30. The radio signals received by the antennas 1a and 1b are input to the transmission / reception switching unit 2 and the receiving unit 3b. When the wireless communication device 30 functions as a receiver, the transmission / reception switching unit 2 is formed with a circuit that guides a signal received by the antenna 1a to the reception unit 3a.

  The receiving units 3a and 3b have a tuning function for selecting and receiving radio waves having specific frequencies. The frequency band of the received radio signal is set by the controller 20 in the receiving units 3a and 3b. And the received signal of the channel of the frequency set to receiving part 3a, 3b is input into the receiving part 3a through the transmission / reception switching part 2 from the antenna 1a, and 3b from the antenna 1b. The receiving units 3a and 3b may receive radio waves with the same frequency or receive radio waves with different frequencies.

  Diversity reception is a technology that preferentially uses signals from antennas with excellent radio wave conditions (high quality) for the same radio signals received by multiple antennas, or combines received signals to remove noise. Technology. In general, diversity reception includes spatial diversity, polarization diversity, frequency diversity, and time diversity. In space diversity and polarization diversity, the transmitter transmits one transmission content with one transmission radio wave. In frequency diversity, the transmitter transmits the same content simultaneously on two frequencies. In time diversity, the transmitter transmits the same content at the same frequency multiple times with different times.

  When the wireless communication device 30 performs space diversity reception or polarization diversity reception, the reception units 3a and 3b receive radio waves having the same frequency. When performing frequency diversity, the receiving units 3a and 3b receive radio waves of different frequencies that are paired with frequency diversity. This embodiment is intended for spatial diversity, polarization diversity, or frequency diversity. In the case of frequency diversity, even when the wireless communication device 30 performs diversity reception, the receiving units 3a and 3b receive radio waves of different frequencies with the same communication content. In the case of frequency diversity, one antenna 1a and 1b can be shared.

  The receiving units 3a and 3b have a demodulation function for demodulating the input received signal. Usually, since the same modulation method is used for transmission and reception, the reception units 3a and 3b perform demodulation using the same modulation method as that of the transmission unit 14 described above. The demodulated baseband signal is input to the baseband processing units 5a and 5b via the input switching units 4a and 4b.

  The input switching unit 4a switches whether the input to the baseband processing unit 5a is a baseband signal from the receiving unit 3a or a baseband signal from the receiving unit 3b. The input switching unit 4b switches whether the input to the baseband processing unit 5b is a baseband signal from the receiving unit 3a or a baseband signal from the receiving unit 3b.

  The signals detected by the receiving units 3a and 3b are input to the quality identifying unit 15. The quality identifying unit 15 compares the received signal strengths of the receiving units 3a and 3b, and determines to the controller 20 which signal receiving unit 3a and 3b has a higher signal strength and is larger or smaller than a threshold value. Output. In the present embodiment, the received signal strength is compared by the quality identifying unit 15, but an error rate of the received signal or a moving average of the error rate may be adopted as the quality of the received radio wave.

  In the case of diversity reception, the input switching unit 4a or 4b selects the higher received signal quality of the receiving units 3a and 3b by the control of the controller 20 according to the output of the quality identifying unit 15, and the baseband processing unit Input to 5a or 5b. In the case of diversity reception, either the baseband processing unit 5a or 5b operates.

  Of the data included in the data portion of the received signal, the audio data included in the audio frame is input to the D / A converters 7a and 7b via the mute circuits 6a and 6b, and is used for data communication included in the data frame. Data is input to the controller 20.

  When digital audio signals are input from the receiving units 3a and 3b, the D / A converters 7a and 7b convert the input digital audio signals into analog audio signals and amplify them under the control of the controller 20. And output to the speakers 8a and 8b. The mute circuits 6a and 6b stop or restart the audio output according to a command from the controller 20. The mute circuits 6a and 6b can instantaneously stop or restart the audio output while maintaining the communication state. In FIG. 1, the mute circuits 6a and 6b are installed between the baseband processing units 5a and 5b and the D / A conversion units 7a and 7b, but the mute circuits 6a and 6b are replaced with the D / A conversion units 7a and 7b. It may be installed in the amplifier or on the output side. When audio is communicated as an analog signal, the received signal is not D / A converted, and the baseband signal is amplified and output to the speakers 8a and 8b.

  As described above, the controller 20 includes the CPU 21, the ROM 24, and the RAM 23. A control program for controlling the controller 20 to function the wireless communication device 30 as a receiver is stored in the ROM 24.

  Next, the operation of the wireless communication device 30 shown in FIG. 1 will be described with reference to FIG. As described above, the operation of the wireless communication device 30 is performed by the CPU 21 of the controller 20 in cooperation with the I / O 22, the RAM 23, the ROM 24, the time measuring unit 25, the display unit 26, and the operation unit 27. In the present embodiment, the receiving units 3a and 3b are symmetric, and perform a symmetric operation regardless of which receiving unit has input sensitivity (or incoming call) first. In the following description, in order to facilitate understanding, it is assumed that the first input sensitivity (or incoming call) is in the receiving unit 3a, and the second input sensitivity (or incoming call) is generated in the receiving unit 3b.

  FIG. 2 is a flowchart showing an example of an operation of switching between diversity reception and two-wave reception in radio communication apparatus 30 according to the embodiment of the present invention.

  When the wireless communication device 30 is not communicating, the receiving units 3a and 3b are waiting for radio waves (communication channels) having different frequencies (step A1, step A2; NO). In this state, if any receiving unit, for example, the receiving unit 3a has input sensitivity (step A2; YES), diversity reception of radio waves of that frequency is performed (step A3). That is, the CPU 21 of the controller 20 receives the radio wave having the same frequency as that of the receiver 3a (in the case of frequency diversity, the radio wave having the frequency of the pair with which the same communication is performed. Command. Then, the input switching unit 4a is controlled so that the baseband signal having the larger received signal strength is input to the baseband processing unit 5a according to the comparison result of the received signal strength between the receiving units 3a and 3b in the quality identifying unit 15. To do. The CPU 21 of the controller 20 displays on the display unit 26 that the communication at the frequency that has been awaited by the receiving unit 3a is being diversity-received. Then, simultaneously with the start of diversity reception, the timer unit 25 is set to measure the passage of a predetermined time.

  If communication ends (step A4; YES) before the predetermined time has elapsed (step A5; NO), the process returns to the initial two-wave standby state (step A1). If the communication continues (step A4; NO) and a predetermined time elapses (step A5; YES), the reception unit 3b tries to receive a radio wave having a frequency at the standby time (step A6). At the same time, the input of the baseband processing unit 5a is used as the baseband signal of the receiving unit 3a. At this time, when the baseband signal of the reception unit 3b is input to the baseband processing unit 5a by diversity reception, the reception unit 3a may receive radio waves of the second frequency. The fixed time during which the reception operation of the other reception unit while receiving by one reception unit (one-wave reception) is a time at which the input sensitivity can be detected at a minimum. In the case of digital radio, it is set longer than the time during which a synchronization burst can be detected.

  If there is no input sensitivity even if the second radio wave standby operation is performed for a certain period of time (no incoming call) (step A7; NO), the process returns to the first radio wave diversity reception state (step A3) for a predetermined time. Repeat the process. If the input sensitivity of the second radio wave is detected (received) (step A7; YES), two-wave reception is performed in that state (step A8, step A9; NO). That is, the baseband signal of the receiving unit 3b is input to the baseband processing unit 5b. The CPU 21 of the controller 20 displays on the display unit 26 that it is receiving with two waves. Further, the frequency (communication channel) received by each of the receiving units 3a and 3b may be displayed on the display unit 26. When the reception unit 3a receives the second frequency, the baseband signal of the reception unit 3a is input to the baseband processing unit 5b, and the baseband signal of the reception unit 3b is input to the baseband processing unit 5a. .

  When communicating at two frequencies simultaneously, for example, a call can be made at the first frequency while monitoring the sound at the second frequency. It is also possible to switch the transmission unit 14 between the first and second frequencies and perform a call alternately at the first and second frequencies. Alternatively, data communication (reception) can be performed at the second frequency while making a call at the first frequency. Another set of transmission functions may be provided in the wireless communication device 30 so that two calls are performed simultaneously, or bidirectional data communication is performed simultaneously at the second frequency.

  When communication of either the first frequency or the second frequency is completed (step A9; YES), radio waves having a frequency at which both the receiving units 3a and 3b continue to communicate are received and diversity reception is performed ( Step A3).

  In this way, when there is input sensitivity of the second radio wave from reception of one-wave diversity, it is possible to automatically shift to reception of two waves. In addition, when one-wave communication is completed after the two-wave reception, it is possible to automatically shift to the remaining one-wave diversity reception. As a result, two sets of receiving units can be used effectively.

  FIG. 3 is a flowchart showing an example of an operation when manually switching between diversity reception and two-wave reception in the embodiment of the present invention. FIG. 3A shows the switching operation between diversity reception and two-wave simultaneous reception, and FIG. 3B shows the operation of mode switching setting between one-wave reception and two-wave reception.

  3A is the same as the automatic switching between diversity reception and two-wave simultaneous reception in FIG. 2 except that the communication mode is determined to determine whether to perform diversity reception or two-wave reception. That is, steps B1 to B4 in FIG. 3 are the same as steps A1 to A4 in FIG. 2, steps B6 to B9 in FIG. 3 correspond to steps A5 to A8 in FIG. 2, and step B11 in FIG. This is equivalent to step A9 in step 2. The communication mode switching shown in FIG. 3B is performed independently of reception. When the communication mode setting is input in the operation unit 27 (step B20), the CPU 21 of the controller 20 has the input communication mode of the single wave mode in which only diversity reception is performed or the input sensitivity of the second radio wave. It is determined whether or not the two-wave mode in which two-wave reception is sometimes performed (step B21). When the communication mode is set to perform only diversity reception (step B21; 1 wave), the mode is set to the 1 wave mode (step B22), and 2 waves are received when there is input sensitivity of the second radio wave. If there is (step B21; 2 waves), the 2-wave mode is set (step B23). At the same time, the display unit 26 displays the 1-wave mode or the 2-wave mode. Setting to the 1-wave mode or the 2-wave mode is to rewrite the communication mode variable stored in the RAM 23 to a predetermined value, for example, 0 or 1. In switching between diversity reception and two-wave simultaneous reception, the communication mode variable is referred to determine which communication mode is being used.

  In the switching between diversity reception and two-wave simultaneous reception shown in FIG. 3A, when diversity reception is being performed (step B3), it is determined whether or not it is the one-wave mode (step B5), one-wave mode. (Step B5; YES), the diversity reception is continued without determining whether the predetermined time has elapsed (Step B3). Therefore, the second frequency is not received.

  When the communication mode is the two-wave mode (step B5; NO), similarly to the case of FIG. 2, when a predetermined time has elapsed (step B6; YES), two waves are received for a certain time (step B7). Here, in order to perform the one-wave mode in a pseudo manner, it may be performed by muting the output of standby (reception) of the second frequency when two waves are received for a certain period of time. That is, in the 1-wave mode, the mute circuit 6b mutes the signal output of the second frequency. Since the standby noise cannot be heard from the speaker 8b, the user can concentrate on the first frequency communication.

  When performing two-wave reception, it may be switched to the one-wave mode. When two-wave reception is being performed (step B9), it is determined whether or not the single-wave mode has been set (step B10). If the single-wave mode has been set (step B10; YES), communication of the designated frequency is performed. The process shifts to diversity reception (step B3). If the two-wave mode is selected (step B10; NO), the two-wave reception is continued (step B9, step B11; NO). When the communication of either the first frequency or the second frequency is completed (step B11; YES), the reception units 3a and 3b receive radio waves having a frequency at which communication is continued, and perform diversity reception ( Step B3). In this way, it is possible to manually switch between 1-wave diversity reception and 2-wave reception.

  Next, the operation when determining whether to perform diversity reception according to the quality of the received signal will be described. FIG. 4 is a flowchart showing an example of an operation in the case of performing diversity reception by identifying the quality of a received signal in the embodiment of the present invention. In the operation of FIG. 4, when one wave is received from the two-wave standby, the quality of the received signal is equal to or lower than a predetermined threshold value instead of shifting to diversity reception unconditionally. In this case, diversity reception is performed.

  In FIG. 4, when any receiving unit, for example, the receiving unit 3a has input sensitivity from the two-wave standby state (step C1, step C2; NO) (step C2; YES), a radio wave call (1 Wave reception) (step C3). That is, the CPU 21 of the controller 20 instructs the input switching unit 4a to use the input to the baseband processing unit 5a as the baseband signal from the receiving unit 3a. Then, the quality identifying unit 15 compares the intensity of the received signal with a predetermined threshold value (step C4). While the intensity of the received signal exceeds the predetermined threshold (step C4; YES), the communication radio wave is received only by the receiving unit 3a (step C3). The receiving unit 3b is in a state of waiting for radio waves having different frequencies.

  When the intensity of the received signal is equal to or lower than the predetermined threshold (step C4; NO), diversity reception is performed (step C5). That is, the receiving unit 3b also instructs to receive radio waves having the same frequency as the receiving unit 3a. Then, the input switching unit 4a is controlled so that the baseband signal having the larger received signal strength is input to the baseband processing unit 5a according to the comparison result of the received signal strength between the receiving units 3a and 3b in the quality identifying unit 15. To do. The CPU 21 of the controller 20 displays on the display unit 26 that the communication at the frequency awaited by the receiving unit 3a is being diversity-received. Then, simultaneously with the start of diversity reception, the timer unit 25 is set to measure the passage of a predetermined time. The subsequent operation is the same as in FIG.

  Although not shown in FIG. 4, when the quality of the received signal exceeds a predetermined threshold during diversity reception, the diversity reception is stopped and the reception unit 3a (or reception unit) You may receive only by 3b). In that case, the receiving unit 3b (or the receiving unit 3a) always waits for radio waves of the second frequency, and therefore can respond quickly when there is input sensitivity of the second frequency (there is an incoming call).

  As described above, by determining whether or not to perform diversity reception according to the quality of the received signal, it is possible to quickly respond to reception of two waves while avoiding excessive diversity reception operation.

  Next, a method for changing the period for waiting for diversity reception and radio waves of the second frequency will be described. FIG. 5 is a flowchart showing an example of the operation when changing the time interval for waiting for the radio wave of the second frequency according to the quality of the received signal in the embodiment of the present invention. In FIG. 5, the operation is the same as the operation of FIG. 2 until diversity reception is performed and it is determined that a predetermined time has elapsed (steps D1 to D5). While performing diversity reception, the quality identification unit 15 determines whether or not the average of the intensity of the received signal exceeds a predetermined threshold (step D6). In practice, the CPU 21 of the controller 20 reads the intensity of the received signal from the quality identifying unit 15 at a constant period, takes an average over a predetermined time, and compares it with a predetermined threshold value.

  If the average received signal strength exceeds the threshold (step D6; YES), the diversity reception is interrupted and the interval (predetermined time) for waiting for the radio wave of the second frequency is set short (step D7). . If the average received signal strength is equal to or less than the threshold (step D6; NO), the interval (predetermined time) for waiting for radio waves of the second frequency is set longer (step D8). That is, in order to measure the next predetermined time, the length set in the timer unit 25 is changed according to the received signal strength. Steps D9 to D12 in FIG. 5 are the same as steps A6 to A9 in FIG.

  It is also possible to set two or more thresholds for comparing the quality of received signals and to set the interval (predetermined time) for waiting for radio waves of the second frequency by interrupting diversity reception to three or more. .

  As described above, by changing the period of waiting for the radio wave of the second frequency according to the quality of the received signal, when the received signal is good, the response of the second frequency is accelerated and the received signal is If it is not good, diversity reception can be performed for a long time to maintain call quality.

  Further, the period for waiting for diversity reception and radio waves of the second frequency may be changed according to the rate of change in the quality of the received signal. FIG. 6 is a flowchart showing an example of the operation when changing the time interval for waiting for radio waves of the second frequency according to the rate of change in the quality of the received signal in the embodiment of the present invention. In FIG. 6, it is the same as the operation of FIG. 2 or FIG. 5 until diversity reception is performed and it is determined that a predetermined time has elapsed (steps E1 to E5). While performing diversity reception, whether the rate of change in the strength of the received signal is positive (that is, the direction in which the quality of the received signal is improved) or negative (that is, the direction in which the quality of the received signal is degraded) Or whether it has not changed (step E6). Actually, for example, the CPU 21 of the controller 20 reads the intensity of the received signal from the quality identifying unit 15 at a constant period, takes the average of the differences during a predetermined time, and compares the magnitude with 0.

  If the rate of change in received signal strength is positive (the direction in which the quality of the received signal is improved) (step E6;> 0), the interval (predetermined time) for waiting for radio waves of the second frequency is set short by stopping diversity reception. (Step E7). If the rate of change in received signal strength is negative (the direction in which the quality of the received signal deteriorates) (step E6; <0), the interval (predetermined time) for waiting for radio waves of the second frequency is set longer (step E8). . If the received signal strength has not changed (step E6; = 0), the predetermined time is not changed. That is, in order to measure the next predetermined time, the length set in the timer unit 25 is changed according to the received signal strength. Steps E9 to E12 in FIG. 6 are the same as steps A6 to A9 in FIG.

  It is also possible to set the interval (predetermined time) for waiting for radio waves of the second frequency by interrupting diversity reception to three or more, and to change the predetermined time stepwise depending on the rate of change in received signal strength. Further, when a plurality of threshold values for the rate of change in received signal strength are provided and the absolute value of the rate of change is large, the predetermined time may be changed in two or more steps at a time. The threshold of the predetermined time and the rate of change can be set as appropriate according to the characteristics of wireless communication, for example, whether the communication is mobile communication, fading conditions, or the like. In the 1-wave mode of FIG. 3, the interval (predetermined time) at which the diversity reception is interrupted and waiting for the radio wave of the second frequency is infinite, and the 2-wave simultaneous reception state is always considered as a special case where the predetermined time is 0. It is done.

  As described above, by changing the period of waiting for the radio wave of the second frequency according to the rate of change in the quality of the received signal, when the received signal is good, the response of the second frequency is accelerated, If the received signal is not good, diversity reception can be performed for a long time to maintain call quality. In addition, fine operation is possible.

  As described above, according to the present invention, since the diversity reception is periodically switched to the two-wave simultaneous reception, even when one wave is being received, another wave can be received and the two sets of receiving units can be effectively used. Can be used. Moreover, it is displayed whether diversity reception or two-wave reception is being performed, and the user can provide a method of manually switching between diversity reception and two-wave reception. Then, by deciding whether or not to perform diversity reception according to the quality of the received signal, it is possible to quickly respond to reception of two waves while avoiding excessive diversity reception operation. Furthermore, when the received signal is good by changing the period of waiting for the radio wave of the second frequency according to the quality of the received signal, the response of the second frequency is accelerated and the received signal is not good On the other hand, diversity reception can be performed for a long time to maintain call quality. By using the rate of change in the quality of the received signal, fine operation is possible.

  In addition, the hardware configuration and the flowchart described above are merely examples, and can be arbitrarily changed and modified.

  The controller 20 of the wireless communication device 30 can be realized using a normal computer system, not a dedicated system. For example, a computer program for executing the above operation is stored and distributed on a computer-readable recording medium (flexible disk, CD-ROM, DVD-ROM, etc.), and the computer program is installed in the computer. Thus, an apparatus that performs the above-described processing may be configured. Alternatively, the wireless communication device 30 of the present invention may be configured by storing the computer program in a storage device included in a server device on a communication network such as the Internet and downloading it by a normal computer system.

  When each of the above functions is realized by sharing an OS (operating system) and an application program, or by cooperation between the OS and the application program, only the application program part is stored in a recording medium or a storage device. Also good.

  It is also possible to superimpose the above computer program on a carrier wave and distribute it via a communication network.

It is a block diagram which shows the structure of the radio | wireless communication apparatus which concerns on embodiment of this invention. It is a flowchart which shows an example of operation | movement of the radio | wireless communication apparatus which concerns on embodiment of this invention. In the embodiment of the present invention, it is a flowchart showing an example of an operation when manually switching between diversity reception and two-wave reception. In the embodiment of the present invention, it is a flowchart showing an example of the operation when performing diversity reception by identifying the quality of the received signal. In an embodiment of the present invention, it is a flow chart which shows an example of operation in the case of changing the time interval which waits for the electric wave of the 2nd frequency according to the quality of a received signal. In an embodiment of the present invention, it is a flow chart which shows an example of operation in the case of changing the time interval which waits for the electric wave of the 2nd frequency according to the rate of change of the quality of a received signal.

Explanation of symbols

3a, 3b receiving unit 4a, 4b input switching unit 5a, 5b baseband processing unit 6a, 6b mute circuit
20 controller
21 CPU
22 I / O
23 RAM
24 ROM
25 Timekeeping Department
26 Display section
27 Operation unit
30 wireless communication device

Claims (9)

First and second receiving units that receive radio waves of the same or different frequencies and output baseband signals, respectively, first and second switching units, and first and second units that process the baseband signals A wireless communication device comprising a baseband processing unit, a time measuring unit for measuring reception time, and a reception frequency control unit,
The first switching unit determines whether an input to the first baseband processing unit is a baseband signal from the first receiving unit or a baseband signal from the second receiving unit. And the second switching unit uses the input to the second baseband processing unit as a baseband signal from the first receiving unit or a baseband signal from the second receiving unit. Switch
The first and second receiving units wait for input radio waves at different frequencies,
When the first or second receiving unit has a first input sensitivity, the second or first receiving unit without the first input sensitivity has a frequency with the first input sensitivity. Receive in tune with the same frequency or the frequency at which the same content is being communicated,
The standby frequency that is different from the frequency at which the first input sensitivity is different from the frequency at which the second or first reception unit without the first input sensitivity is measured at a predetermined time measured by the timing unit. With the input radio wave waiting for a certain time,
Further, when the second or first receiver has a second input sensitivity, the first and second receivers receive radio waves having different frequencies,
A wireless communication apparatus. A reception mode selection means for selecting diversity reception or two-wave simultaneous reception;
When diversity reception is selected by the reception mode selection means when the first and second reception units are receiving or waiting for radio waves of different frequencies, the second or first reception unit One is received in tune to the same frequency as the frequency received by the other receiver, or the frequency at which the same communication is performed.
The wireless communication apparatus according to claim 1. When diversity reception is selected by the reception mode selection means, one of the second or first receiving units performs communication with the same frequency as the frequency received by the other receiving unit or the same content. To perform reception that is tuned to a certain frequency is to mute the output of the baseband processing unit,
The wireless communication apparatus according to claim 2. Whether the first and second receiving units are receiving radio waves having the same frequency or the same frequency of communication, or receiving different frequency radio waves. Comprising display means for displaying;
The wireless communication device according to claim 1, wherein the wireless communication device is a wireless communication device. Receiving signal identifying means for identifying the quality of the received signal received by the first or second receiving unit;
When the quality of the received signal with the first input sensitivity is equal to or lower than a predetermined threshold, the second or first receiving unit without the first input sensitivity is configured to receive the first input sensitivity. Tuned to the same frequency as the one that was present, or the frequency at which the same communication is being performed,
The wireless communication apparatus according to claim 1. Receiving signal identifying means for identifying the quality of the received signal received by the first or second receiving unit;
The predetermined time measured by the time measuring unit is set to 2 or more,
When the received signal quality of the frequency having the first input sensitivity exceeds a predetermined threshold value, the second or first receiving unit without the first input sensitivity is the first input sensitivity. Shorten the interval of waiting for input radio waves at the standby frequency different from the frequency with input sensitivity,
When the received signal quality of the frequency having the first input sensitivity is equal to or lower than a predetermined threshold value, the second or first receiving unit without the first input sensitivity is the first input sensitivity. Increase the interval of standby operation for the input radio wave at the standby frequency different from the frequency where the
The wireless communication apparatus according to claim 1. The frequency at which the second or first receiving unit without the first input sensitivity has the first input sensitivity according to the rate of change in the received signal quality of the frequency with the first input sensitivity. Changing the interval of standby operation for the input radio wave at a frequency different from the standby time,
The wireless communication apparatus according to claim 6. First and second receiving units that receive radio waves of the same or different frequencies and output baseband signals, respectively, first and second switching units, and first and second units that process the baseband signals A wireless communication device reception method comprising: a baseband processing unit; a timing unit that measures reception time; and a reception frequency control unit,
The first switching unit determines whether an input to the first baseband processing unit is a baseband signal from the first receiving unit or a baseband signal from the second receiving unit. And the second switching unit uses the input to the second baseband processing unit as a baseband signal from the first receiving unit or a baseband signal from the second receiving unit. Switch
The first and second receiving units wait for input radio waves at different frequencies,
When the first or second receiving unit has a first input sensitivity, the second or first receiving unit without the first input sensitivity has a frequency with the first input sensitivity. Receive in tune with the same frequency or the frequency at which the same content is being communicated,
The standby frequency that is different from the frequency at which the first input sensitivity is different from the frequency at which the second or first reception unit without the first input sensitivity is measured at a predetermined time measured by the timing unit. In standby for input radio waves,
Further, when the second or first receiver has a second input sensitivity, the first and second receivers receive radio waves having different frequencies,
A receiving method for a wireless communication apparatus. First and second receiving means for receiving radio waves of the same or different frequencies and outputting baseband signals, first and second switching means, and a first for processing the baseband signals. And a second baseband processing means, a time measuring means for measuring a reception time, and a reception frequency control means.
First switching means for switching whether an input to the first baseband processing unit is a baseband signal from the first receiving unit or a baseband signal from the second receiving unit;
Second switching means for switching whether the input to the second baseband processing unit is a baseband signal from the first receiving unit or a baseband signal from the second receiving unit;
First and second receiving means for waiting for input radio waves at different frequencies,
When the first or second receiving means has a first input sensitivity, the second or first receiving means without the first input sensitivity has a frequency with the first input sensitivity. Receive in tune with the same frequency or the frequency at which the same content is being communicated,
The standby frequency that is different from the frequency at which the first input sensitivity is different from the frequency at which the second or first reception unit without the first input sensitivity is measured at a predetermined time measured by the timing unit. With the input radio wave waiting for a certain time,
Furthermore, when the second or first receiving means has a second input sensitivity, the first and second receiving means receive radio waves having different frequencies, respectively.
The first and second receiving means;
A computer program that makes it work.

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