JPH11298384A - Antenna diversity radio system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To utilize information obtained at the time of receiving for transmission antenna selection in communication between fixed station radio equipment with each other by making a radio receiving means receive a radio signal, a signal analyzing means analyze its content and a transmission antenna deciding means decide an transmission antenna based on an analytical result. SOLUTION: A controlling part 9 produces transmission data and outputs it to a modulating means 10. The means 10 modulates the transmission data sent from the part 9 and sends it to a radio transmitting means 11. The means 11 transmits the signal modulated by the means 10. A transmission antenna deciding means 12 decides a transmission antenna based on information from an antenna switching means 8. That is, the means 8 outputs information of which data from between demodulating means A5 and B6 is sent to the part 9 to the means 12 at the time of receiving. The means 12 decides an antenna to transmit between antennas 1 and 2 and switches to it.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric appliance installed inside or outside a home or a wireless slave unit installed or built in a household equipment unit, and a wireless terminal unit installed inside or outside the home to grasp the operation status of each device or to make an emergency. The present invention relates to an information network system including a wireless master device installed or built in an information collection device for relaying / transmitting information, and in particular, a method in which at least one wireless device has a plurality of antennas and performs antenna diversity. It is about.

[0002]

2. Description of the Related Art A conventional system utilizing this kind of antenna diversity is generally the one described in Japanese Patent Application Laid-Open No. 05-0494964. This is a "wireless communication device and its antenna diversity method"
This is an antenna diversity method capable of realizing cost reduction and miniaturization of a wireless communication device and accurately selecting an antenna system. FIG. 8 shows an embodiment of the “wireless communication device and its antenna diversity method”.
~ 18. FIG. 8 is a block diagram showing a schematic configuration of one embodiment of a wireless telephone device as a wireless communication device according to the present invention. This wireless telephone device employs a TDMA / TDD (time division multiple access / time division bidirectional) wireless communication system. In FIG. 8, reference numeral 20 denotes a first antenna for transmitting / receiving a radio signal, 21 denotes a second antenna for transmitting / receiving a radio signal, 30 denotes an antenna changeover switch for selecting an antenna system to be adopted at the time of transmission / reception, 40
Is a transmitter for transmitting an audio signal to be transmitted, 50 is a receiver for receiving a signal transmitted by radio, 60 is a demodulator for demodulating a received signal, and 70 is a modulator for modulating a transmission signal. Reference numeral 80 denotes a control unit for controlling the transmission / reception operation of the wireless telephone device, reference numeral 90 denotes an audio codec unit for encoding a transmitted audio signal and decoding of a received audio signal, and reference numeral 100 denotes other necessary transmission / reception of audio signals. It is a peripheral circuit that shares various functions.

[0003] First and second two antennas 20, 2
1 (hereinafter, each system is referred to as an antenna system) is connected while securing a specified distance in order to obtain a diversity effect. The antenna switch 30 switches and connects either the first antenna 20 or the second antenna 21 to the transmitter 40 or the receiver 50. The transmitter 40 is the modulator 7
0 and one of the antenna systems. Receiver 50
Is composed of only one system, and is connected to one of the antenna systems and the demodulator 60. The demodulator 60 includes only one system, and is connected to the receiver 50 and the control unit 80. Modulator 70
Is connected to the transmitter 40 and the control unit 80. Control unit 80
Are a synchronizing circuit 81 for controlling the operation timing of the entire wireless telephone device according to the embodiment, a microcomputer 82 for controlling the overall operation of the wireless telephone device, and software (program) necessary for the processing operation of the microcomputer 82 , A channel codec unit 84 that processes transmission / reception data in accordance with the operation speed of TDMA, an antenna switch 30,
The radio control unit 85 controls the operation of the transmitter 40 and the receiver 50 in accordance with the operation speed of TDMA. The peripheral circuit 100 is connected to an external device (for example, a PSTN network 500). The audio codec unit 90 and the peripheral circuit 1
00 has a different circuit configuration depending on the wireless telephone device to which these are applied.

As described above, the receiver 50 and the demodulator 6
Since 0 is constituted by one system, the receiving system of the wireless telephone device according to this embodiment has a structure as shown in FIG. As shown in FIG.
Is a parallelogram having, for example, four switch pieces 30a, 30b, 30c, 30d on each side, so that the first and second antennas 20, 21 can be connected to one receiver 50. (I.e., a bridge circuit) switch is used, and two switches are provided at opposing portions (between 30a and 30b and between 30c and 30d) between switch pieces.
Antennas 20 and 21 are connected to each other, and other opposing portions (between 30d and 30a and 30
(between b and 30c) by connecting the transmitter 40 and the receiver 50, respectively. During the data transmission operation, the antenna changeover switch 30 selectively turns on the switch pieces 30a and 30d among the switch pieces 30a to 30d, and causes the transmitter 40 to connect to the first antenna 20 or the second antenna 21. Connected. On the other hand, in the data receiving operation, the switch piece 30a of the antenna changeover switch 30 is used.
The switch pieces 30b and 30c are selectively turned on among the switches 30 to 30d, and the receiver 50 is connected to the first antenna 20 or the second antenna 21. The antenna switch 30 has the following five switching states.

[0005] First switching state: Transmission / reception pause All four switch pieces are off Second switching state: Antenna 1 transmission Transmitter connected to first antenna Third switching state: Antenna 2 transmission Transmit to second antenna Device connection Fourth switching state: Antenna 1 reception Receiver connected to first antenna Fifth switching state: Antenna 2 reception Receiver connected to second antenna Receiver 50 performs reception processing such as detection, and demodulator 60 The demodulated received data is sent to the microcomputer 82 in the control unit 80. Also, the reception electric field strength detected by the receiver 50, that is, the reception electric field level is controlled by the control unit 8.
0 is sent to the wireless control unit 85. The microcomputer 82 determines the number of CRC errors based on data from the CRC error reading unit 821, the CRC error number storage unit 822 that records the number of times a CRC error has occurred, and the data from the CRC error number storage unit 822. And a CRC error number determination unit 823. On the other hand, the radio control unit 85 includes a previous frame electric field level storage unit 851 for storing the received electric field level information sent from the receiver 50 for each frame, and a previous frame electric field level storage unit 8.
An electric field intensity comparing unit 852 for comparing the electric field level of the current frame with the electric field level of the current frame by referring to the data of 51;
2 based on the comparison result in
And an antenna switching control unit 853 that outputs a control signal for switching from the antenna 20 to the second antenna 21 or vice versa to the antenna switching switch 30. With this antenna switching control signal, the antenna switching switch 30 is set to one of the five switching states.

Here, the synchronization circuit 81 incorporated in the control unit 80 will be described in detail with reference to FIGS. The synchronization circuit 81 includes a frequency dividing / signal generating unit 811 having a frequency dividing circuit for generating a reference clock, and a microcomputer interface unit 8 for matching a data transfer operation between the microcomputer 82.
12, a network synchronization unit 813 for connecting the apparatus of this embodiment to another apparatus, a highway signal control unit 814, and a wireless control signal unit 815.

The frequency divider / signal generator 291 generates 19.2 MHz (t) in order to generate a reference clock for the radio telephone device.
A clock necessary for the operation of each circuit is generated by a frequency dividing circuit using cxo) as a source oscillation. FIG. 12 shows a timing chart regarding the clock generation. As shown in this figure, the frequency dividing / signal generating unit 813 includes, for example, a 9.6 MHz clock, a TDM
The frame timing of A is 200 Hz clock (A in FIG. 12), the TDMA slot timing is 1.6 KHz clock (B in FIG. 12), the transmission / reception signal bit clock timing is 384 KHz (C in FIG. 12), the transmission / reception signal The symbol clock timing is 192 KHz (D in FIG. 12), the clock timing of the audio highway signal is 128 KHz, the control clock for setting to the PLL is 2.4 MHz (E in FIG. 12), and the reference clock of the channel codec section is 1.92 MHz. Generate each clock. Further, each clock of the transceiver timing (F in FIG. 12) and the antenna switching timing (GG in FIG. 12) is also generated. The PLL setting control clock is output so as to take timing about 1/2 slot before the slot in both the transmission slot and the reception slot. Accordingly, for example, the PLL setting control clock for the second slot among the four reception slots in one frame is output during the reception of the first slot as shown in E in FIG. The transceiver timing clock is output at a timing even earlier than the slot and PLL setting control clock, as indicated by F in FIG. As shown by G in FIG. 12, a clock for setting the antenna switching timing is output at two points for each slot in a reception section of a frame, and is output at one point for each slot in a transmission section.

A microcomputer interface unit 812 is an interface block for setting an initial value to the synchronization circuit 81 from the microcomputer 82. The microcomputer interface unit 812 includes an address line designating the synchronization circuit 81, a data line for data setting, and It is composed of read / write control lines and the like.

FIG. 10 is a diagram schematically showing an overall configuration of a wireless communication system in a case where the wireless telephone device according to this embodiment is a base station. In this figure, 300 is a radio mobile station such as a mobile radio telephone, 400 is a radio base station corresponding to the apparatus according to this embodiment, 401 is another radio base station, and 500 realizes communication by an analog voice signal. A PSTN network, which is a public switched telephone network, 600 is an integrated service digital network that realizes communication by digital voice signals, and 700 is a private branch exchange.

[0010] The network synchronization unit 813 is configured so that the wireless base station 400, which is the wireless telephone device according to this embodiment, uses a private branch exchange (PB).
X) This is a valid block when connected to 700. Here, the radio base station 400 connected to the PBX 700,
Generate a timing signal for synchronizing between 401,
With this timing, the PBX 700 changes the radio base station 40
0/401 is periodically notified. As a result, the synchronization timing between the radio base stations 400 and 401 can be obtained, and interference from another radio base station 401 in the TDMA transmission / reception slot can be prevented.

The highway signal control section 814 is for specifying, for example, the timing of an audio signal corresponding to each transmission / reception slot, and 32 kBPS is a clock for four slots (32 × 4 = 128 KHz).

The radio control signal section 815 is used for ensuring that the transmitter 40 and the receiver 50 operate in the TDMA slot, for example, turning on / off the power of the transceivers 24 and 25 and setting the transmission / reception frequency to the PLL. Is generated and notified to the wireless control unit 85 in the control unit 80.

As the microcomputer 82 of the present invention, a commercially available 8-bit or 16-bit general-purpose microcomputer is used. Accordingly, since the functional blocks of the microcomputer 82 are the same as the functional block diagram of the manufacturer, detailed description thereof will be omitted.

Next, the software memory 83 will be described with reference to FIG. The software memory 83 of the present invention includes, for example, an EPROM (program memory erasable by ultraviolet rays), a flash memory, and an EEPROM.
(Electrically rewritable memory) stores control software and uses a RAM (rewritable memory) for work. As specific storage software, it manages software control of the entire device,
Generally, OS (operating system) and monitor 8
31 and a layer 1 level generally BIOS 832 that mediates between hardware and software.
It comprises software called (basic input / output system), link establishment software 833 for establishing a communication phase at the layer 2 level, software 834 for setting up a network connection at the layer 3 level, and an application program 835 unique to the device. Is done.

The OS and the monitor 831 are control software for maximizing the performance of the microcomputer 82, and execute a program of a control unit generally called a task according to a processing priority determined for each device.
It controls the stop. The BIOS 832 is control software for maximizing the performance of the hardware of the device. Specifically, the BIOS 832 controls the gate array and the serial and parallel input / output ports which are the component parts of the device, and controls the data block transfer by DMA. It controls the mutual conversion between digital and analog signals, controls the timer of the device, and controls the hardware specific to the device.
In particular, control software for switching antennas for diversity and for switching antennas such as detection of communication data (CRC) errors and arithmetic processing is stored in this block. In addition, a program for determining the level of the electric field strength for each reception TDMA slot is also stored here.

The link establishment software 833 is software that is commonly applied to the radio mobile station 300 and the radio base station 400, and is generally of a layer 2 level and standardized in the communication equipment industry. . This is, for example, when making a call by telephone,
Transmitted to the radio base station 400 from the "link channel assignment signal" for establishing a communication phase. Further, a CRC error of the communication signal is detected in the communication channel and retry control at that time is performed. The network connection setting software 834 is generally of a layer 3 level, and is largely composed of radio management, mobility management, and call control for circuit switching between the link establishment software 833 and the application program 835. Is standardized in the telecommunications industry. The application program 835 is software that defines functions unique to the device, and is defined by each manufacturer. This is dedicated to each of the radio mobile station 300 and the radio base station 400, and is specified for each radio telephone device to be manufactured, thereby realizing the function.

Regarding the extraction of transmission / reception data of the channel codec 84, a signal format used in the TDMA wireless communication system is standardized in the communication industry.
The signal format is shown in FIG. 14 and FIG. As is apparent from these figures, in the TDMA wireless communication system, one wireless carrier (frequency) is transmitted for 5 ms per frame.
(Milliseconds), which is divided into eight to define a unit called a slot. Therefore, one slot corresponds to 1.
6 KHz, and one frame of the wireless carrier is transmitted 4
It consists of a slot (this is called a transmission section) and four reception slots (this is called a reception section), so that it is possible to actually use four communication paths. And FIG.
In, for example, communication data transmitted from the transmitting side on the transmission TDMA slot CH1 TX of channel 1 in one wireless carrier frame is detected on the receiving side at the slot timing shown in FIG. Data transmission / reception is performed such that the data is received in the TDMA slot CH1 RX. FIG. 15 and FIG.
6 shows the data configuration of 351 frames of communication data transmitted and received in this manner. This communication data 35
Represents a preamble section 351, a frame synchronization section 352,
It comprises a valid data section 353 into which data to be transmitted / received such as voice data is incorporated, and a CRC section 354 used to detect a communication data error.

The channel codec 84 in FIG.
Is, for example, 240 for each reception slot from the demodulator 60.
A bit serial signal is fetched based on the slot control timing signal from the synchronization circuit 81, and it is determined whether the received signal is valid at the following two points. One is whether frame synchronization signals (which are called unique words in the communication industry) match. The other is the presence or absence of a CRC error in a valid data portion (for example, a voice signal or a communication data signal). When the signal is valid, the data in the valid data section is transmitted to the audio codec section 90, for example, according to the attribute in the signal, and the microcomputer 82
May be sent to The same control is performed for each reception slot, and the processing to be performed differs depending on whether the signal attribute of transmission / reception is, for example, a voice signal or a communication data signal.

The channel codec 84 can be configured to receive data from the voice codec 90 if the data to be transmitted is, for example, an audio signal, or from the microcomputer 82 if the data to be transmitted is a control signal.
In the A slot, the signal can be transmitted to the modulator 70 by the transmission timing signal from the synchronization circuit 81. At this time, in order to make the signal format configuration of the wireless section,
A preamble portion, a frame synchronization (unique word) signal, valid data, and addition of a CRC code to the valid data are performed. For example, the format is assembled into a signal configuration of 240 bits.

The radio control unit 85 converts the frequency data designated by the microcomputer 82 in advance for each reception slot into a PLL control clock from the synchronization circuit 81, a transmission / reception control timing, a PLL setting timing, a frequency setting timing, and the like. , The write control to the PLL is performed. Further, on / off of the transceiver is controlled in synchronization with the TDMA slot in accordance with the transmission / reception timing from the synchronization circuit 81. Further, the wireless control unit 85
The level of the received electric field is collected at the reception time slot timing from 0, and the microcomputer 82 refers to this to perform the normal processing of the wireless communication of the apparatus and the processing at the time of error. In the antenna diversity method of the present case, the radio control unit 85 determines each reception electric field level for each reception slot, and automatically performs switching control to an optimum antenna system for each reception TDMA slot.

The audio codec section 90 has a different configuration depending on the device to which it is applied. As an example, when the radio base station 400 is connected to an analog public network (PSTN network) 500, the block configuration shown in FIG. 17 is used. When the radio base station 400 is a digital public network (ISDN network) 600, the block configuration shown in FIG. When connected to the PBX 700, this block can be made unnecessary and the PBX 7
00 can be configured to have the blocks shown in FIG. 17 or FIG. In FIGS. 17 and 18, reference numeral 901 denotes a transcoder circuit having a function of converting the transmission rate of a digital signal, 902 denotes an echo canceller circuit that eliminates echoes and takes measures against reverberation of a voice signal, and 903 denotes a 64 KBPS digital voice signal. Is a codec circuit having a function of converting or converting an analog audio signal into an analog audio signal. Transcoder circuit 901
Is specifically converted to a digital audio signal of 32 KBPS in order to convert the transmission rate of the digital signal,
Or perform the inverse transformation. The codec circuit 903 can be composed of commercially available components.

The operation of the wireless telephone having the above configuration will be described below. (First Operation Example) Here, a basic transmission / reception operation of the wireless telephone device according to the present invention will be described. In this embodiment, the device is a radio base station 400 and the PSTN network 5
FIG. 10 shows an example of operation during communication when connected to 00
This will be described with reference to the configuration diagram of FIG. The peripheral circuit 100
Connected to N network 500. After a communication protocol has been established with the radio base station 400 by a calling operation from the radio mobile station 300 or an incoming call from the PSTN network 500 and communication is possible, the reception of the radio base station 400 is performed using one of the first determined antennas. The microcomputer 82 in the control unit 80 controls the wireless control unit 85 by using the software memory 83 so as to start the reception by the second antenna 21.
Controls the antenna changeover switch 30. The signal received by the second antenna 21 is received by the demodulator 60 via the receiver 50, the synchronization is performed by the frame synchronization (unique word) signal, and the reception data and the result of the reception processing (synchronization error) are performed. Etc.) to the control unit 80 and the voice codec unit 90. The channel codec unit 84 in the control unit 80 receives the reception data and the reception result from the demodulator 60 in synchronization with the reception TDMA timing, and relays this to the microcomputer 82. The audio codec unit 90 converts the transmission rate of the audio signal from the channel codec unit 84 and converts it into an analog signal, and sends the analog signal to the peripheral circuit 100. Peripheral circuit 100
Outputs an analog audio signal to the PSTN 500 at a signal level corresponding to the PSTN 500. The error detection of the received signal is performed by the error detection section 841 of the channel codec section 84, which is read by the CRC error reading section 821 of the microcomputer 82 and stored in the CRC error number storage section 822, and the CRC error number determination section 8
At 23, the number is determined.

The transmission of the radio base station 400 is performed by the PSTN 5
The peripheral codec 100 converts the level of the analog audio signal from the signal 00, the audio codec 90 receives the signal, converts the signal into a digital signal, converts the signal into a transmission rate in a wireless section, and outputs the signal to the channel codec 84. The unit 84 controls the transmission in accordance with the instruction of the microcomputer 82 in advance according to the timing of the transmission TDMA.
Send the transmission signal to 0. The modulator 70 modulates according to a specified modulation method (for example, π / 4 shift QPSK). Prior to this, the radio control unit 85 that controls the transmission of the transmitter 40 transmits the TDMA of the transmission TDMA according to the instruction of the microcomputer 82. The first antenna 20 or the second antenna 21 is connected to the transmitter 40 as an antenna at the time of transmission according to the timing. Thus, the modulated transmission data is transmitted to the wireless mobile station 300 via the transmitter 40. When the wireless base station 400 is connected to the ISDN network 600 or the PBX, the audio codec unit 90 and the peripheral circuit 1
The circuit configuration of 00 corresponds to a digital signal.

[0024]

However, the above-mentioned conventional "wireless communication apparatus and its antenna diversity method" has only one receiving system and is an antenna switching system. In this method, if the antenna is switched during data reception, the contact at the antenna switch changes, so that noise may be generated and data may be erroneous. This is because, in the case of the TDMA / TDD (time division multiplex access / time division two-way) wireless communication system as in the conventional example, data is divided into slots for each time and transmitted, so that an antenna is provided for each slot. However, it is possible to avoid the above-described problems such as noise by switching, but it is difficult in a one-way / simplex wireless communication system applied to a cordless water heater unless the antenna is switched for each data bit. Also, it is difficult to switch on a bit-by-bit basis because of the trade-off between data transmission speed and processing / switching time. Furthermore, in the conventional example, the selected antenna at the time of reception is determined based on the electric field strength result measured at the time of reception in the immediately preceding time slot, but a time difference occurs between the time of actual data reception and the time of data transmission. If the radio wave environment changes due to fading during this time difference, the antenna selected as the optimum transmission antenna is not actually the same, and there is a possibility that the transmission data may not reach the other party. Here, in the conventional example, at least one of the wireless devices that mainly transmits voice and performs communication, such as a wireless telephone device, is mobile communication that is assumed to move. Therefore, even if instantaneous fluctuations in the electric field intensity occur due to the effects of fading or the like and the level becomes small, there is a high possibility that the electric field will recover instantaneously. Further, even if the median value fluctuation of the electric field intensity occurs due to the influence of shadowing or the like and the level becomes small, communication becomes possible if the person with the telephone terminal moves to a place where the median value fluctuation can be avoided. Also, even if the electric field strength fluctuates due to fading, it is only slightly difficult to hear in the case of voice,
When the electric field strength recovers, the voice quality also recovers. In addition, the probability of recovery of the electric field strength is high because the person moves with him. However, in a system such as a cordless water heater in which all wireless devices are fixedly installed and data is transmitted instead of voice, fluctuations in electric field strength due to fading, particularly fluctuations in the median value, can hardly recover the level and can be a serious problem. In addition, there is a case where urgently required data is included in the content of the data, and it is extremely undesirable that a situation where communication cannot be performed due to a lack of radio waves occurs. As described above, the conventional example has a significant problem depending on the wireless communication system and applied products.

[0025]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, an antenna diversity radio system according to the present invention has at least two or more fixedly installed radios communicating with each other and at least one radio has two or more antennas. A wireless system that performs antenna diversity, comprising: a wireless device that performs antenna diversity, wireless receiving means for receiving a wireless signal with two or more antennas, and signal analysis for analyzing the content of the signal received by the wireless receiving means. Means, and a transmitting antenna determining means for determining a transmitting antenna based on a result analyzed by the signal analyzing means.

In addition, at least two or more fixedly installed radios communicate with each other after registering their installation positions at the time of initial registration with each other, and at least one radio has two or more antennas and performs antenna diversity. A position information storage means for storing position information;
It is also possible to adopt a configuration having transmission antenna determination means for determining a transmission antenna based on the position information stored in the position information storage means.

Further, at least two or more fixedly installed radios communicate with each other and at least one radio is a radio system having two or more antennas and performing antenna diversity. Wireless receiving means for receiving a wireless signal with one or more antennas, signal analyzing means for analyzing the content of the signal received by the wireless receiving means, position estimating means for estimating the position of the partner radio device, and the position estimating means It is also possible to adopt a configuration having transmission antenna determination means for determining a transmission antenna according to the position of the partner radio device assumed by the means.

[0028]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An antenna diversity radio system comprising a fixed station radio according to claim 1 of the present invention has radio receiving means, signal analyzing means and transmitting antenna determining means. Then, the wireless receiving means receives the wireless signal, the signal analyzing means analyzes the content, and the transmitting antenna determining means determines the transmitting antenna based on the analysis result.

An antenna diversity radio system comprising a fixed station radio according to claim 2 of the present invention has radio receiving means, signal analyzing means, and transmitting antenna determining means,
Further, the signal analyzing means has a level determining means. Then, the wireless receiving means receives the wireless signal, the level determining means in the signal analyzing means determines the level of the received signal, and the transmitting antenna determining means determines the transmitting antenna based on the determination result.

An antenna diversity radio system comprising a fixed station radio according to claim 3 of the present invention has a radio receiving means, a signal analyzing means, and a transmitting antenna determining means,
Further, the wireless receiving means has an antenna switching means.
Then, the antenna switching unit in the wireless receiving unit switches the antenna to receive the signal, the signal analysis unit analyzes the content, and the transmission antenna determination unit determines the transmission antenna based on the analysis result.

An antenna diversity radio system comprising a fixed station radio according to claim 4 of the present invention has radio receiving means, signal analyzing means and transmitting antenna determining means,
Further, the signal analyzing means has a level determining means and a receiving antenna determining means. The wireless receiving means receives the wireless signal, the level determining means in the signal analyzing means determines the level of the received signal, the receiving antenna determining means determines the level at the start of receiving the received signal, and the transmitting antenna determining means Determines the transmitting antenna based on the level determination result at the start of reception.

An antenna diversity radio system comprising a fixed station radio according to claim 5 of the present invention has radio reception means, signal analysis means and transmission antenna determination means,
Further, the signal analyzing means has a level determining means and a receiving antenna determining means. The wireless receiving means receives the wireless signal, the level determining means in the signal analyzing means determines the level of the received signal, the receiving antenna determining means determines the level at the end of receiving the received signal, and the transmitting antenna determining means Determines the transmitting antenna based on the level determination result at the end of the reception.

An antenna diversity radio system comprising a fixed station radio according to claim 6 of the present invention has radio receiving means, signal analyzing means and transmitting antenna determining means,
Further, the signal analysis means has an error detection means. And
The wireless receiving means receives the wireless signal, the error detecting means in the signal analyzing means analyzes the error of the received signal, and the transmitting antenna determining means determines the transmitting antenna based on the result of the error analysis of the received signal.

An antenna diversity radio system comprising a fixed station radio according to claim 7 of the present invention has radio receiving means, signal analyzing means and transmitting antenna determining means,
Further, the wireless receiving means has an antenna switching means and an antenna use number storing means, and the signal analyzing means has a level determining means. Then, the wireless receiving means receives the wireless signal, the level determining means in the signal analyzing means determines the reception level of the signal, and the antenna switching means in the wireless receiving means switches the receiving antenna based on the reception level determination result. The number of reception antennas used by the number-of-uses storage means is counted, and the transmission antenna determination means determines the transmission antenna based on the number of times the reception antenna is used.

An antenna diversity radio system comprising fixed station radios according to claim 8 of the present invention and performing communication after registering each other's position information has position information storage means and transmission antenna determination means. Then, the location information storage means stores the location information of the partner radio device at the time of the initial registration, and the transmission antenna determination means determines the transmission antenna based on the location information.

An antenna diversity radio system comprising a fixed station radio according to a ninth aspect of the present invention has a radio receiving means, a signal analyzing means, a position estimating means, and a transmitting antenna determining means. Then, the radio receiving means receives the radio signal, the signal analyzing means analyzes the content, the position estimating means presumes the position of the opponent radio device from the analysis result, and the transmitting antenna determining means transmits the radio signal based on the assumed opponent radio device position. Determine the antenna.

An antenna diversity radio system comprising a fixed station radio according to claim 10 of the present invention has a radio receiving means, a signal analyzing means, a position estimating means, and a transmitting antenna deciding means, and the signal analyzing means has a level judgment. Means and level storage means. The wireless receiving means receives the wireless signal, the level determining means in the signal analyzing means determines the level of the received signal, the level storage means stores the received signal level, and the position estimating means stores the stored received signal level. As a result, the transmitting antenna determining means determines the transmitting antenna based on the assumed partner wireless device position.

[0038]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of a home network system to which the antenna diversity wireless system of the present invention is applied. This system installs (or incorporates) a wireless device in various household equipment such as air conditioners, water heaters, gas tables, etc., and provides information on the operation status, abnormality detection information,
This is a system for transmitting failure information and the like to a living information terminal by wireless communication. The living information terminal displays the information of these various types of housing equipment by voice or screen to notify consumers. That is, this is a system in which a plurality of wireless devices communicate with one wireless device installed (or built-in) in the living information terminal. Here, the wireless device on the living information terminal side is referred to as a “master device”, and the wireless devices on various household equipment devices are referred to as “slave devices”.

(Embodiment 1) FIG. 2 is a block diagram showing the configuration of a radio unit (master unit) for performing antenna diversity according to the first embodiment. In FIG. 2, 1 and 2 are antennas. In this embodiment, a two-branch space diversity having two antennas is used. 3 is a wireless receiving means A. 4 is a wireless receiving means B. Reference numeral 5 denotes demodulation means A. Reference numeral 6 denotes demodulation means B. Reference numeral 7 denotes a level determination unit. 8 is an antenna switching means. 9 is a control unit. Reference numeral 10 denotes a modulation unit. Reference numeral 11 denotes a wireless transmission unit. Reference numeral 12 denotes a transmitting antenna determining unit. The level determining means 7 and the control section 9 constitute a signal analyzing means.

Referring to FIG. 2, the operation for receiving a signal will be described first. The master unit receives signals from the slave units via antennas 1 and 2. The signal received by antenna 1 is received by wireless receiving means A3, and the signal received by antenna B is received by wireless receiving means B4. Here, the wireless receiving unit A3 sends the received signal to the demodulating unit A5, measures the electric field strength of the received signal, and sends the measurement result to the level determining unit 7. On the other hand, the wireless receiving means B4 also sends the received signal to the demodulating means B6, measures the electric field strength of the received signal, and sends the measurement result to the level determining means 7. Here, the radio receiving means A3 and the radio receiving means B4 constantly measure the electric field strength repeatedly after the existence of the received signal is confirmed until the received signal disappears. The demodulation means A5 and the demodulation means B6 demodulate the signals received by the radio reception means A3 and the radio reception means B4, respectively, and output them to the antenna switching means 8 as baseband data. The level determining means 7 compares the magnitudes of the electric field strengths measured by the wireless receiving means A3, A3 and B4, and outputs the result to the antenna switching means 8. The antenna switching means 8 outputs to the control unit 9 the data having the larger electric field strength among the received data sent from the demodulation means A5 and the demodulation means B6 based on the judgment result from the level judgment means 7.
That is, the antenna switching means 8 does not switch between the antenna 1 and the antenna 2, which are the antennas that actually receive the signal, but switches which of the demodulated data is valid. This is called a combined reception method. The control unit 9 captures the data of the receiving system selected by the antenna switching unit 8 and analyzes the content of the data. Here, the control unit 9 is usually constituted by a microcomputer.

Next, the operation for transmitting a signal will be described. The control unit 9 creates transmission data and modulates the
Output to The modulation unit 10 modulates the transmission data sent from the control unit 9 and sends the data to the wireless transmission unit 11. The wireless transmission means 11 transmits the signal modulated by the modulation means 10. The transmission is transmitted from antenna 1 or antenna 2. Here, which of the antenna 1 and the antenna 2 to transmit a signal is determined by the transmission antenna determining means 12. The transmitting antenna determining means 12 determines a transmitting antenna based on information from the antenna switching means 8. That is, the antenna switching means 8 outputs to the transmission antenna determination means 12 information on which data from the demodulation means A5 or the demodulation means B6 has been sent to the control unit 9 during reception. The transmitting antenna determining unit 12 sets the antenna for transmitting the transmitting signal transmitted from the wireless transmitting unit 11 based on the information from the antenna switching unit 8 to the antenna 1.
And antenna 2 are determined and switched.

Thus, transmission and reception of signals are performed. According to this method, the antenna switching means 8 can switch the receiving system while receiving a signal, so that the receiving system always having a large electric field strength can receive the signal. This means that a system that always copes with fluctuations in the received electric field strength due to various fadings is established. Further, the antenna switching means 8 does not switch between the antenna 1 and the antenna 2 which actually receive the signal, but switches which of the demodulated data is effective. T
It is possible to cope with not only the DMA / TDD wireless communication system but also the one-way / simplex wireless communication system as this time.

The level determining means 7, the antenna switching means 8, and the transmitting antenna deciding means 12 can be constituted by a microcomputer similarly to the control unit 9. In this case, the control unit 9 includes the level determination unit 7, the antenna switching unit 8, and the transmission antenna determination unit 12.
Can be called.

On the other hand, the radio receiving means A3 and the radio receiving means B4 do not always repeatedly measure the electric field strength until the reception signal disappears after the existence of the reception signal is confirmed.
There is also a method of measuring the electric field intensity only when the presence of the received signal is confirmed. In the case of this method, the level determining means 7 compares the magnitude of the electric field strength measured by the wireless receiving means A3 and the wireless receiving means B4 at the time when the presence of the received signal is confirmed, and outputs the result to the antenna switching means 8. . The antenna switching unit 8 outputs to the control unit 9 the data with the larger electric field strength among the received data sent from the demodulation units A5 and B6 based on the result. In this method, since the wireless receiving means A3 and the wireless receiving means B4 measure the electric field intensity only once, the antenna switching means 8
Also switches the receiving system only once. That is, when the existence of the received signal is confirmed, the measuring system to be received is determined, and the transmitting antenna determined by the transmitting antenna determining means 12 is also determined.

According to this method, it is not necessary to switch the receiving system when the actual received data is input to the control unit 9. That is, the wireless receiving means A3 and the wireless receiving means B
Reference numeral 4 terminates the measurement of the electric field strength, outputs the result to the level determination means 7, and then outputs the received signal to the demodulation means A5 or B6. That is, when the antenna switching means 8 switches the receiving system only once, the demodulation means A5
Alternatively, no reception data has been sent from the demodulation means B6. After the antenna switching means 8 switches the receiving system, the received data is sent. Thus, the switching of the receiving system is not performed during the reception data input. As described above, it has been described that the system having only one receiving system as in the conventional example can support not only the TDMA / TDD wireless communication system but also the one-way / simplex wireless communication system as in this case. In the system in which the antenna switching unit 8 switches the receiving system during reception data input, there is a possibility that some noise is generated and the data is erroneous even though the switching is not performed at the antenna stage. However, if the reception system is not switched during reception data input, there is no need to worry about this switching noise.

Further, the following method is also conceivable.
That is, the wireless receiving means A3 and the wireless receiving means B4 constantly measure the electric field strength repeatedly after the existence of the received signal is confirmed until the received signal disappears. That is, at the time of reception, even during data input, the antenna switching means 8 switches the reception system. However, the information output by the antenna switching means 8 to determine the transmitting antenna to the transmitting antenna determining means 12 is based on the electric field strength measured by the wireless receiving means A3 and the wireless receiving means B4 when the presence of the received signal is confirmed. Only the result compared by the means 7 is taken. That is, the antenna at the time of transmission is determined by the magnitude of the electric field strength at the time of starting the previous reception.

According to this method, the time interval between the measurement of the electric field strength at the two antennas and the actual transmission of the transmission signal from the antenna determined based on the measurement result is equal to or longer than the reception data length. It will be. Assuming that the received data length is about 20 seconds, a signal is actually transmitted at least 20 seconds after the electric field strength is measured. here,
Even if the electric field intensity drops for several seconds (median value fluctuation) due to fading after the electric field intensity measurement time, the level at the electric field intensity measurement time point because there is an interval of 20 seconds or more before the signal is actually transmitted It is likely to recover up to. The median value fluctuation of the electric field strength occurs when a moving object moves behind a building at a mobile station. In a fixed station communication such as a home network system, a situation occurs in which a main radio wave propagation path is interrupted by a person stopping around a wireless device. Therefore,
This is effective in a home wireless system where people come and go.

Further, the following method is also conceivable.
That is, the wireless receiving means A3 and the wireless receiving means B4 constantly measure the electric field strength repeatedly after the existence of the received signal is confirmed until the received signal disappears. That is, at the time of reception, even during data input, the antenna switching means 8 switches the reception system. However, the information output by the antenna switching means 8 to determine the transmitting antenna to the transmitting antenna determining means 12 is immediately before all the actual received data is taken into the control unit 9, that is, when the wireless receiving means A3 and the wireless receiving means B4 receive the data. Is the result of comparison of the electric field intensity measured at the end of the above by the level determination means 7 only. That is,
The antenna at the time of transmission is determined by the magnitude of the electric field strength at the time of the end of the previous reception.

According to this method, the time interval between the measurement of the electric field strength at the two antennas and the actual transmission of the transmission signal from the antenna determined based on the measurement result is the same as the above-described “transmission”. The antenna at the time is determined by the magnitude of the electric field strength at the start of the previous reception. " Here, the reception power of the antenna 1 of the two antennas of the master unit caused a drop in the electric field strength (median value fluctuation) over several seconds due to fading, and the drop overlapped the measurement timing of the electric field strength at the end of reception. In this case, the measurement result of the electric field strength at the end of data reception in the receiving system on the antenna 1 side is small. At this time,
If the result of the measurement of the electric field strength at the end of data reception in the receiving system on the antenna 2 side, which is the other antenna, has a large value, the information output by the antenna switching means 8 to the transmitting antenna determining means 12 is Select 2 "
It becomes the contents. Then, the transmitting antenna determining means 12
At the time when the transmitting antenna is determined to be the antenna 2 and the actual transmission of the signal is started, the time is short after the antenna switching means 8 determines by comparing the electric field strength, so that the electric field strength at the antenna 1 remains low and The field strength of 2 is likely to remain large. That is, in such a case, it is possible to determine the transmitting antenna with an accurate determination.

(Embodiment 2) FIG. 3 is a block diagram showing the configuration of a radio unit (master unit) that performs antenna diversity according to Embodiment 2 of the present invention. In FIG. 3, reference numerals 1 and 2 denote antennas.
In this embodiment, a two-branch space diversity having two antennas is used. 3 is a wireless receiving means A. 4 is a wireless receiving means B. Reference numeral 5 denotes demodulation means A. Reference numeral 6 denotes demodulation means B. 9 is a control unit. Reference numeral 10 denotes a modulation unit. Reference numeral 11 denotes a wireless transmission unit. Reference numeral 12 denotes a transmitting antenna determining unit. Numeral 13 denotes an error detecting means, which together with the control section 9 constitutes a signal analyzing means.

Referring to FIG. 3, the operation for receiving a signal will be described first. The master unit receives signals from the slave units via antennas 1 and 2. The signal received by antenna 1 is received by wireless receiving means A3, and the signal received by antenna B is received by wireless receiving means B4. Here, the wireless receiving unit A3 sends the received signal to the demodulating unit A5. on the other hand,
The wireless receiving means B4 also sends the received signal to the demodulating means B6. The demodulation means A5 and the demodulation means B6 demodulate the signals received by the radio reception means A3 and the radio reception means B4, respectively, and output them to the error detection means 13 as baseband data. The error detection means 13 detects errors in both the data sent from the demodulation means A5 and the data sent from the demodulation means B6. As a result, the error detector outputs the data with the smaller error to the control unit 9. The control unit 9 captures the data of the receiving system selected by the error detection means 13 and analyzes the content of the data. Here, the control unit 9 is usually constituted by a microcomputer.

Next, the operation for transmitting a signal will be described. The control unit 9 creates transmission data and modulates the
Output to The modulation unit 10 modulates the transmission data sent from the control unit 9 and sends the data to the wireless transmission unit 11. The wireless transmission means 11 transmits the signal modulated by the modulation means 10. The transmission is transmitted from antenna 1 or antenna 2. Here, which of the antenna 1 and the antenna 2 to transmit a signal is determined by the transmission antenna determining means 12. The transmitting antenna determining means 12 determines a transmitting antenna based on information from the error detecting means 13.
That is, the error detection unit 13 outputs to the transmission antenna determination unit 12 information on which data from the demodulation unit A5 or the demodulation unit B6 has been sent to the control unit 9 during reception. Based on this information from the error detecting means 13, the transmitting antenna determining means 12 determines whether the antenna transmitting the transmission signal transmitted from the wireless transmitting means 11 is the antenna 1 or the antenna 2.
And switch.

Thus, transmission and reception of signals are performed. According to this method, the radio receiving means A3 and the radio receiving means B determine the selected receiving system at the time of reception and the transmitting antenna at the time of transmission based on the number of data errors rather than the received electric field strength.
4 does not require an electric field intensity measurement portion. Error detection means 1
Various methods can be considered as the error detection method 3. For example, errors in all of the received data sent from the demodulation means A5 and B6 may be detected, or an error check may be performed only on data in a specific part. Also, the output information to the transmission antenna determination means 12 may be the transmission antenna information determined by the error detection means 13 based on the number of errors in the reception data of the first limited portion of the reception signal, as in the first embodiment. Alternatively, the transmission antenna information may be determined based on the number of errors in the reception data of the last limited portion of the reception signal. The features in these cases are the same as those in the first embodiment. Note that the transmission antenna determining means 12 and the error detecting means 13 can be configured by a microcomputer, similarly to the control section 9. In this case, the control unit 9 includes the transmission antenna determination unit 12 and the error detection unit 13.
Can be called.

(Embodiment 3) FIG. 4 is a block diagram showing the configuration of a radio unit (master unit) for performing antenna diversity according to Embodiment 3 of the present invention. In FIG. 4, reference numerals 1 and 2 denote antennas.
In this embodiment, a two-branch space diversity having two antennas is used. 3 is a wireless receiving means A. 4 is a wireless receiving means B. Reference numeral 5 denotes demodulation means A. Reference numeral 6 denotes demodulation means B. 9 is a control unit. Reference numeral 10 denotes a modulation unit. Reference numeral 11 denotes a wireless transmission unit. Reference numeral 12 denotes a transmitting antenna determining unit. Numeral 14 denotes an antenna usage count storage unit, and the level determination unit 7 and the control unit 9 constitute a signal analysis unit.

In FIG. 4, the operation when receiving a signal is the same as that in the first embodiment. In other words, the master unit receives a signal from the slave unit via the antenna 1 and the antenna 2, and receives received data from the wireless receiving unit A3 to the antenna switching unit 8 via the demodulating unit A5 or the wireless receiving unit B4 via the demodulating unit B6. Also, the wireless receiving means A3
The electric field strength measured from the radio receiving means B4 is sent to the level determining means 7, and the comparison result of the electric field strength is sent to the antenna switching means 8. The antenna switching means 8 outputs the data having the larger electric field strength to the control unit 9 based on the determination result from the level determination means 7, of the received data transmitted from the demodulation means A 5 and B 6. Analyzes the data content.

Next, the operation for transmitting a signal will be described. The control unit 9 creates transmission data and modulates the
Output to The modulation unit 10 modulates the transmission data sent from the control unit 9 and sends the data to the wireless transmission unit 11. The wireless transmission means 11 transmits the signal modulated by the modulation means 10. The transmission is transmitted from antenna 1 or antenna 2. Here, which of the antenna 1 and the antenna 2 the signal is transmitted from is determined by the antenna usage count storage unit 14. The antenna usage count storage means 14 operates as follows. At the time of reception, antenna switching means 8
Switches the received data to be output to the control unit 9 from the demodulation means A5 or the output from the demodulation means B6 based on the information on the magnitude of the electric field strength sent from the level determination means 7. Outputs the information to the antenna usage count storage unit 14. Antenna storage means 1
4 stores the result. That is, for one reception, the receiving system A (the flow from the antenna 1 to the wireless receiving unit A3 to the demodulating unit A5) is used frequently or the receiving system B (the flow from the antenna 2 to the wireless receiving unit B4 to the demodulating unit B6). The number-of-times-of-antennas-use storage unit 14 counts and stores whether the number of times of using is large. Then, the information indicating which of the receiving systems has the larger number of times is transmitted to the transmitting antenna determining means 1.
Output to 2. The transmitting antenna determining means 12 determines the transmitting antenna based on the information from the antenna use number storing means 14. That is, the transmitting antenna determining means 12 determines the antenna for transmitting the transmission signal transmitted from the wireless transmitting means 11 depending on which receiving system has transmitted the received data to the control section 9 most frequently during the previous reception.
And antenna 2 are determined and switched.

As described above, signal transmission and reception are performed. According to this method, the antenna switching means 8 can switch the receiving system while receiving the signal as in the case of the first embodiment, so that it is possible to always receive in the receiving system having a large electric field strength. Furthermore, since the switching antenna (frequency of use) for each receiving system is counted and the transmission antenna is determined based on the result, it is possible to transmit with the antenna with the smaller drop in the electric field strength due to fading at the time of immediately preceding reception. . This means that a system that always copes with fluctuations in the received electric field strength due to various fadings is established. The level determining means 7, the antenna switching means 8, the control unit 9, the transmitting antenna determining means 1
2. The antenna usage count storage means 14 may be constituted by a microcomputer.

(Embodiment 4) FIG. 5 is a system configuration diagram of Embodiment 4 of the present invention. In FIG. 5, reference numeral 15 denotes a fixed station radio base station that performs antenna diversity. 16, 17,
Reference numeral 18 denotes a fixed-station wireless terminal that communicates with the fixed-station wireless device 15. FIG. 5 is a simplified representation of the home network system of FIG.

FIG. 5 shows one master unit (fixed-station wireless master unit 15).
And three slave units (fixed-station wireless slave unit 16, fixed-station wireless slave unit 1)
7, an example in which the fixed-station wireless slave device 18) performs communication. FIG.
In, the ellipse represents the distance from the fixed-station wireless base station 15. That is, the remote unit closest to the fixed-station radio base station 15 is the fixed-station radio sub-unit 16, and the remotest station is the fixed-station radio sub-unit 18.

Next, FIG. 6 shows an internal block diagram of the fixed station radio base station 15. In FIG. 6, reference numerals 1 and 2 denote antennas. 3 is a wireless receiving means A. 4 is a wireless receiving means B. Reference numeral 5 denotes demodulation means A. Reference numeral 6 denotes demodulation means B.
Reference numeral 7 denotes a level determination unit. 8 is an antenna switching means. 9 is a control unit. Reference numeral 10 denotes a modulation unit. 1
1 is a wireless transmission means. Reference numeral 12 denotes a transmitting antenna determining unit. 19 is a position information storage unit.

In FIG. 5, the base station radio base station 15 and the base station radio handsets 16, 17, and 18 perform an initial registration operation for installation. That is, this is an operation in which each wireless device registers information necessary for wireless communication. At the time of this initial registration operation, each of the fixed-station wireless slave units 16, 17, and 18 sends information indicating the position of its own station to the fixed-station wireless base station 15. Information indicating the position of the own station is notified by a method of inputting to each slave unit by a person at the time of installation work or the like. Each of the fixed-station wireless terminals 16, 17, and 18 sends the input information indicating the position of the own station to the fixed-station wireless base station 15 by an initial registration operation. The information indicating the position is, for example, position coordinates and the like. The fixed station radio base station 15 is
Position information during the initial registration operation transmitted from 7 and 18 is wirelessly received. The received signal is demodulated and sent to the control unit 9 in FIG. Note that this position information is received by the receiving system A shown in FIG.
(Antenna 1 → wireless receiving means A3 → demodulating means A5) or receiving system B (antenna 2 → wireless receiving means B4
Demodulation may be performed in any one of (flow of demodulation means B6). That is, the antenna switching unit 8 may switch according to the output of the level determination unit 7 as in the case of the first embodiment. The demodulated position information of each slave unit is sent to the control unit 9, and the control unit 9 analyzes the position information.
Here, its own positional information (including the antenna position, the antenna directivity, the gain, etc.) is registered in the fixed-station wireless base station 15 in advance. This registration is performed when the fixed-station wireless base station 15 is installed. The control unit 9 entangles and analyzes both the received position information of each slave unit and its own position information. For example,
Regarding the position information from the fixed-station radio slave unit 16, the fixed-station radio slave unit is considered in consideration of the distance between the two (the fixed-station radio slave unit 16 and the fixed-station radio master unit 15) and the directivity of its own antenna 1 and antenna 2. 16 is related (antenna 1
(For example, whether or not the fixed-station wireless handset 16 exists in the maximum directivity direction). The control unit 9 outputs these analysis results to the position information storage unit 19. Based on the output from the control unit 9, the position information storage unit 19 determines which of the antennas 1 and 2 transmits radio waves more easily to reach the other party when performing wireless communication with the fixed station wireless terminal 16, The result is output to the transmission antenna determining means 12. Based on the determination result of the position information storage unit 19, the transmission antenna determination unit 12 transmits the transmission data transmitted from the control unit 9 through the modulation unit 10 and the wireless transmission unit 11 in the same manner as in the first embodiment. 2 to switch the transmission.

According to this method, at the time of transmission from the fixed-station radio base station 15 to each slave unit, signals can be transmitted from an antenna suitable for a radio wave propagation path by grasping the mutual positions. This method is established because both the master unit and the slave unit are fixed stations. Note that the level determination unit 7, the antenna switching unit 8, the control unit 9, the transmission antenna determination unit 12, and the position information storage unit 19 can be constituted by a microcomputer.

(Embodiment 5) FIG. 7 is an internal block diagram of Embodiment 5 of the present invention. In FIG. 7, reference numerals 1 and 2 denote antennas. 3 is a wireless receiving means A. 4 is a wireless receiving means B. Reference numeral 5 denotes demodulation means A. Reference numeral 6 denotes demodulation means B. Reference numeral 7 denotes a level determination unit. 8 is an antenna switching means. 9 is a control unit. Reference numeral 10 denotes a modulation unit. Reference numeral 11 denotes a wireless transmission unit. Reference numeral 12 denotes a transmitting antenna determining unit. Reference numeral 20 denotes position estimating means. Note that the level analysis means 7 and the control section 9 constitute a signal analysis means.

In FIG. 7, the procedure from reception of a radio wave by an antenna to input of demodulated data to the control unit 9 is the same as that of the first embodiment.
Is the same as Here, the wireless receiving means A3 and the wireless receiving means B4 also output the field strength measurement result of the received signal output to the level determining means 7 to the position estimating means 20. The position assuming means 20 assumes the position of the other wireless device (the wireless device that has transmitted the signal) from the input electric field strength. The position is assumed as follows, for example. The received electric field strength in free space becomes (Equation 1) due to the attenuation of the radio wave accompanying the radio wave propagation.

[0065]

(Equation 1)

In addition to the above equation, in an actual environment, fading occurs due to the influence of an object such as a building or the effect of a moving object, and the electric field intensity fluctuates. Also, the electric field strength varies depending on the characteristics of the transmitting and receiving antennas (directivity, gain, etc.). Therefore, the position estimating means 20 determines, for example, the antenna 1 based on the input electric field strength.
Using the above equation, which of the antenna and the antenna 2 is closer to the partner wireless device is calculated. The calculation result is output to the transmission antenna determining means 12. Transmission antenna determination means 12
The transmission data transmitted from the control unit 9 through the modulation unit 10 and the wireless transmission unit 11 according to the output of the position estimation unit 20 in the same manner as in the first embodiment is transmitted to the antenna 1 and the antenna 2
Switch between the two.

According to this method, it is possible to transmit a radio wave from an appropriate transmitting antenna, assuming the position of a wireless device on the other side from information at the time of reception. Note that this assumption result can be applied to antenna selection at the time of signal reception. That is,
As described above, when the signal is received by the method as in the first embodiment, the antenna switching unit 8 sets the receiving system A (the flow of the antenna 1 → the wireless receiving unit A3 → the demodulating unit A5) or the receiving system B (the antenna 2 → the wireless receiving unit B4). → The flow of the demodulating means B6) may be switched, but the position estimating means 20 determines which of the receiving system A and the receiving system B to start receiving at the start of reception (which demodulated data is input to the control unit 9). , The antenna switching means 8 can select one of the receiving systems at the start of reception in accordance with the output signal. Here, if the reception timing is such that instantaneous fluctuations due to fading (large electric field strength fluctuations in a short time) are unlikely to occur, switching is performed by the reception system selected by the antenna switching means 8 at the start of reception and thereafter until reception is completed. Is highly unlikely to occur (or is unlikely to occur), and it is possible to prevent an increase in power consumption caused by the switching of the reception system and an effect of switching noise that may occur at the time of switching, though not as much as in the conventional example. The level determining means 7, the antenna switching means 8, the control unit 9, the transmitting antenna determining means 12, and the position estimating means 20 can be constituted by a microcomputer.

Further, the position estimating means 20 may not only assume the position of the partner radio device from the electric field strength at the time of the previous reception, but also consider a method of assuming the position of the partner radio device from the electric field intensity at the time of the past reception. Can be In this case, position estimating means 2
0 is stored therein every time the received electric field strength is output from the wireless receiving means A3 and the wireless receiving means B4,
An appropriate transmitting antenna is selected based on those past electric field intensities, and the fact is output to the transmitting antenna determining means 12. This makes it possible to grasp the tendency of the electric field strength to fluctuate due to fading or the like, and to make up a system with higher accuracy than in the fifth embodiment.

[0069]

The effects of the present invention as described above are listed below.

(1) In the antenna diversity radio system according to the first aspect, there is an effect that information obtained at the time of reception in communication between fixed station radios can be utilized for transmission antenna selection. Also, since the receiving system can be switched while receiving a signal (the receiving system is switched instead of switching the antenna at the time of receiving), the TDMA / T system is used in a system having only one receiving system as in the conventional example.
Instead of the DD wireless communication system, it is also possible to use a one-way / simplex wireless communication system like this one.

(2) In the antenna diversity radio system according to the second aspect, since the transmitting antenna is selected based on the electric field strength measured at the time of reception in communication between fixed station radios, the fluctuation of the electric field strength at the time of reception due to fading or the like. It is possible to select a transmission antenna based on the tendency, and it is possible to realize a fixed-station wireless communication system that is hardly affected by fading and has high communication reliability.

(3) In the antenna diversity radio system according to the third aspect, since the receiving system is switched even during signal reception in communication between the fixed station radios, it is possible to always receive in the receiving system having a large electric field strength. There is an effect that a system that always responds to fluctuations in the received electric field strength due to fading is established.

(4) In the antenna diversity radio system according to the fourth aspect, the transmission antenna for the next transmission is selected by the reception system selected based on the electric field strength at the time when the presence of the reception signal is confirmed, that is, at the start of reception. A long time interval from the selection of the transmitting antenna to the actual transmission of the signal can be secured, and the electric field strength drops over several seconds due to fading (median value fluctuation).
There is an effect that it is possible to cope with the occurrence of. Such a situation occurs in a fixed station communication such as a home network system when a person stops around a wireless device and a main radio wave propagation path is interrupted. Therefore, it is effective in a wireless system in a home where people come and go.

(5) In the antenna diversity radio system according to the fifth aspect, the transmission antenna for the next transmission is selected by the receiving system selected based on the electric field strength at the end of reception, so that the electric field strengths at the two antennas are measured. Therefore, the time interval from the antenna determined based on the measurement result to the actual transmission of the transmission signal is considerably short, so that there is an effect that the transmission antenna can be determined according to the instantaneous fluctuation of the electric field strength. .

(6) In the antenna diversity radio system according to the sixth aspect, a selective reception system is determined at the time of reception based on the number of data errors instead of the reception field strength, and a transmission antenna is determined at the time of transmission. Become. Further, unlike the case of selecting an antenna at an electric field strength where a level change occurs due to fading, a transmission antenna is selected according to the number of data errors affected by noise and the like, so that there is an effect that a system resistant to noise and the like can be constructed. .

(7) In the antenna diversity radio system according to the seventh aspect, since the receiving system can be switched while receiving a signal, it is possible to always perform reception in a receiving system having a high electric field strength. Further, since the switching antenna (frequency of use) for each receiving system is counted and the transmission antenna is determined based on the result, it is possible to transmit using the antenna with the smaller drop in the electric field strength due to fading at the time of the previous reception. There is an effect that a system that always responds to fluctuations in the received electric field strength due to fading is established.

(8) In the antenna diversity radio system according to the eighth aspect, in a system between fixed station radios, when transmitting a signal, the positions of each other are grasped by setting at the time of initial communication, and an appropriate antenna is used as a radio wave propagation path. There is an effect that a signal can be transmitted.

(9) In the antenna diversity radio system according to the ninth aspect, in a system between fixed station radios, a radio wave is transmitted from an appropriate transmitting antenna by assuming the position of the partner radio based on the electric field strength measured at the time of immediately preceding reception. Therefore, there is an effect that the position of the partner wireless device can be assumed in response to the fluctuation of the received electric field strength. Also, by applying this method to antenna selection at the time of reception, the reception timing changes instantaneously due to fading (large electric field intensity fluctuation in a short time).
Is difficult to occur, there is a high possibility that switching will not (or hardly occur) in the receiving system selected by the antenna switching unit 8 at the beginning of reception until the end of reception, and the consumption caused by the switching of the receiving system will be high. There is an effect that it is possible to prevent the influence of switching noise which may occur at the time of switching, although not as much as in the conventional example, with an increase in power.

(10) In the antenna diversity radio system according to the tenth aspect, in the system of fixed station radios, not only the position of the partner radio is assumed from the electric field strength at the time of the last reception but also the time of the past reception. Since the position of the partner wireless device is assumed from the electric field strength, the tendency of the fluctuation of the electric field strength due to fading, etc. can be grasped,
It is possible to create a more accurate system.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a home network system to which an antenna diversity wireless system according to the present invention is applied.

FIG. 2 is a block diagram illustrating a configuration of a wireless device that performs antenna diversity according to the first embodiment of the present invention.

FIG. 3 is a block diagram illustrating a configuration of a wireless device that performs antenna diversity according to a second embodiment of the present invention.

FIG. 4 is a block diagram illustrating a configuration of a wireless device that performs antenna diversity according to a third embodiment of the present invention.

FIG. 5 is a system configuration diagram of an antenna diversity wireless system according to a fourth embodiment of the present invention.

FIG. 6 is a block diagram illustrating a configuration of a wireless device that performs antenna diversity according to a fourth embodiment of the present invention.

FIG. 7 is a block diagram illustrating a configuration of a wireless device that performs antenna diversity according to a fifth embodiment of the present invention.

FIG. 8 is a block diagram of a wireless communication device in one embodiment of a conventional wireless communication device and its antenna diversity method.

FIG. 9 is a block diagram showing a configuration of a receiver according to the conventional example.

FIG. 10 is a functional block diagram showing a wireless communication system in which the conventional wireless communication device is incorporated.

FIG. 11 is a block diagram showing a configuration of a synchronization circuit in which the conventional wireless communication device is incorporated.

FIG. 12 is a timing chart illustrating timings of various clocks generated by the conventional synchronous circuit.

FIG. 13 is a block diagram showing a configuration of a software memory incorporated in the conventional wireless communication apparatus.

FIG. 14 shows a TDMA / T adopted by a conventional wireless communication apparatus.
Transmission / reception timing chart of DD wireless system

FIG. 15 is a diagram illustrating a frame configuration of communication data in a TDMA / TDD wireless system and a conventional operation of measuring a received electric field strength.

FIG. 16 is a diagram for explaining a reception electric field strength measurement operation of the communication data in a conventional example in more detail.

FIG. 17 shows a PSTN of the voice codec section of the conventional example.
Block diagram showing the configuration for the network

FIG. 18 shows an ISDN of the voice codec of the conventional example.
Block diagram showing the configuration for the network

[Explanation of symbols]

 Reference Signs List 1 antenna 2 antenna 3 wireless receiving means A 4 wireless receiving means B 5 demodulating means A 6 demodulating means B 7 level judging means 8 antenna switching means 9 control unit 10 modulating means 11 wireless transmitting means 12 transmitting antenna determining means 13 error detecting means 14 Antenna usage count storage means 15 Fixed station radio base station 16 Fixed station radio sub station 17 Fixed station radio sub station 18 Fixed station radio sub station 19 Position information storage section

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yasuhiro Ban 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (10)

[Claims] 1. A wireless system in which at least two or more fixedly installed wireless devices communicate with each other and at least one wireless device includes two or more antennas and performs antenna diversity, wherein the wireless device that performs antenna diversity is two or more. Wireless receiving means for receiving a wireless signal with one or more antennas, signal analyzing means for analyzing the content of the signal received by the wireless receiving means, and transmission for determining a transmitting antenna based on the result of analysis by the signal analyzing means An antenna diversity wireless system having an antenna determining unit. 2. The signal analyzing means includes level determining means for analyzing the magnitude of a signal received by the wireless receiving means, and the transmitting antenna determining means determines a transmitting antenna based on a result determined by the level determining means. 2. The antenna diversity wireless system according to 1. 3. The antenna diversity radio system according to claim 2, wherein said radio receiving means has antenna switching means for switching between two or more antennas based on information on the magnitude of the signal determined by said level determining means during signal reception. 4. The antenna diversity radio system according to claim 2, wherein said signal analysis means includes a reception antenna determination means for switching an antenna based on a result of determination by said level determination means at the time of starting signal reception by said radio reception means and determining a reception antenna. 5. The antenna diversity radio system according to claim 2, wherein said signal analysis means has a reception antenna determination means for switching an antenna according to a result of determination by said level determination means at the end of signal reception of said radio reception means to determine a reception antenna. 6. The signal analyzing means has an error detecting means for detecting an error in the content of the signal received by the radio receiving means, and the transmitting antenna determining means determines a transmitting antenna based on the error content detected by the error detecting means. The antenna diversity wireless system according to claim 1. 7. The signal analyzing means has level determining means for analyzing the magnitude of the signal received by the radio receiving means, and the radio receiving means uses the information on the magnitude of the signal determined by the level determining means during signal reception. Antenna switching means for switching between two or more antennas; and antenna usage count storage means for storing the number of times of use for reception for each antenna by switching by the antenna switching means. 2. The antenna diversity wireless system according to claim 1, wherein the transmitting antenna is determined based on the number of times used for reception for each antenna stored in the antenna. 8. A radio system in which at least two or more fixedly installed radios register each other's installation positions at the time of initial registration and communicate with each other, and at least one radio has two or more antennas and performs antenna diversity. An antenna diversity wireless system comprising: a position information storage unit that stores position information; and a transmission antenna determination unit that determines a transmission antenna based on the position information stored in the position information storage unit. 9. A radio system in which at least two or more fixedly installed radios communicate with each other and at least one radio is equipped with two or more antennas and performs antenna diversity. Wireless receiving means for receiving a wireless signal with one or more antennas, signal analyzing means for analyzing the content of the signal received by the wireless receiving means, position estimating means for estimating the position of the partner radio device, and the position estimating means An antenna diversity wireless system having a transmitting antenna determining means for determining a transmitting antenna according to a position of a partner wireless device assumed by the means. 10. The signal analyzing means has level determining means for analyzing the magnitude of a signal received by the wireless receiving means, and level storing means for storing the level determined by the level determining means, and the position estimating means is a level storing means. 10. The antenna diversity wireless system according to claim 9, wherein the position of the partner wireless device is assumed from the past received signal level stored in the means.