JP2800567B2 - Wireless device for multipath communication - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio apparatus for multipath communication, and more particularly, to a carrier frequency and an antenna for a plurality of time division multiplex radio apparatuses constituting a radio communication line when interference waves and fading occur. Etc.,
Further, the present invention relates to a radio apparatus for multipath communication capable of adjusting transmission power and avoiding interference and fading of an interfering wave.

[0002]

2. Description of the Related Art Conventionally, when a radio communication line is constituted by a plurality of relay stations, for example, as shown in FIG.
32 and 33 are cascaded, and transmission and reception are performed between the relay station 31 and the relay station 32 using the radio frequencies F1 and F2.
Radio frequencies F3 and F4 are provided between the relay station 32 and the relay station 33.
Is used to transmit and receive to and from lower stations at frequencies F5 and F6. Here, when the relay station 33 receives the interference wave 34 and the frequency is close to F3, it is necessary to switch the radio frequency F3 to another frequency. Now the relay stations 31, 32,
When the directivity of the antenna 33 is relatively wide, such as in multi-directional multiplexing, and the distance between the relay stations 34 and 31 is not so far from the relay station 32, the relay station 33 uses the frequency F3 with the relay station 32. , F4 is temporarily stopped, and the communication quality is slightly degraded, but it is also possible to adopt a line configuration in which the radio wave of the relay station 31 is directly received as indicated by dotted lines F1 and F2. In this case, the relay station 33 had to separately prepare transmission and reception devices for the frequencies F1 and F2. Here, the relay stations 31 and 3
As shown in FIG. 3, the time division multiplex wireless communication devices 2 and 33 have a microwave antenna 102 and an antenna duplexer 10.
4, the receiver 107 and the transmitter 106 face, for example, an uplink wireless communication line. Further, a transmitter 105, a receiver 108, an antenna duplexer 103, and an antenna 101 having a wide directivity are provided to face a downstream wireless communication line via digital signal reproducing circuits 109 and 110.

[0003]

In the radio apparatus used in the conventional multipath communication, the carrier frequency is a value specific to each transmitter or receiver, and an interference wave or a fading occurs. In this case, there is a disadvantage that the transmitter or the receiver must be replaced manually or a separate transmitting / receiving device must be prepared and switched.

[0004]

A radio apparatus for multipath communication according to the present invention has at least two pairs of transmission / reception data with an upper station.
In a multipath communication radio apparatus for transmitting / receiving a digital signal to / from a lower station using a pair of transmission / reception radio waves after input / output one of the received radio waves and reproducing the digital signal, a communication state from the upper station is determined. Means for monitoring, means for receiving the signal transmitted from the upper station, and means for separating the carrier frequency switching request signal multiplexed in the time slot of each frame, and for switching the carrier frequency by the carrier frequency switching request signal. And a means for adjusting the transmission output and switching the antenna, and a means for multiplexing information for switching the frequency of the carrier wave in the time slot of each frame and transmitting the information to the upper station.

[0005]

Next, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of one embodiment of the present invention. FIG.
Is an antenna 1, 2, 3, 3 and a duplexer 4,
5, transmitters 6,7, receivers 8,9, reproduction circuits 10,1
1. Bit error rate (BER) measurement circuits 12, 19, switching information multiplexing circuit 13, reception frequency control circuit 14, reception antenna switching control circuit 15, switching request detection circuit 16, transmitter control circuit 17, transmission antenna switching control circuit 18, a switching request multiplexing circuit 20, a switching information detecting circuit 21, and a registered terminal station list 22.

Next, for example, the operation of the radio equipment of the relay station 33 will be described separately for the upper station and the lower station. First, the operation of the upper station will be described. The directions of the antennas 2 and 3 are set in accordance with different upper stations. Now, it is assumed that communication is performed using the antenna 2 for both transmission and reception in the initial state. In the case of the upper station, there are two causes for switching the carrier frequency, and one is when the bit error rate of the received signal has deteriorated below a certain threshold.
The other one is a case where a request for switching the carrier frequency is made from the partner station, and the transmission frequency is switched. First, the above case will be described. The received signal input from the antenna 2 is input to the BER measurement circuit 12 via the antenna duplexer 5, the receiver 8, and the reproduction circuit 10. The BER measuring circuit 12 measures the BER in a certain section of the received signal, and when the BER value is below a certain threshold, the switching information multiplexing circuit 13, the receiving frequency control circuit 14, the receiving antenna switching control circuit 15 To the BER degradation information. Upon receiving the information, the switching information multiplexing circuit 13
Multiplexes information for switching the reception frequency to a predetermined position on the uplink radio frame, and the reception frequency control circuit 14
A reception frequency switching request is issued to the receiver 8, and the reception antenna switching control circuit 15
A switching request is issued so as to receive the received signal received from the antenna 3 from the antenna 3, and the receiving operation is started at a new frequency. Next, a case described later will be described. The received signal input from the antenna 2 is input to the switching request detection circuit 16 via the antenna duplexer 5, the receiver 8, and the reproduction circuit 10. The switching request detection circuit 16 detects a transmission frequency switching request from the upper station and transmits the switching request information to the transmitter control circuit 17 and the transmission antenna switching control circuit 18. Upon receiving the information, the transmitter control circuit 17
A transmission frequency switching request and a transmission output adjustment request are issued to the transmitter 7, and the transmission antenna switching control circuit 1
8 starts communication with a different upper-level station at a new frequency by issuing a switching request so that a transmission signal that has been transmitted to the antenna 2 until now is transmitted from the antenna 3.

Next, the operation of the lower station will be described. In the case of the lower station, the transmission / reception frequency of the own station does not change, and the transmission / reception frequency of the lower station changes. Here, the registered terminal station list 22 is a memory for storing which station is the lower station that is performing communication, independently of transmission and reception.
The received signal input from the antenna 1 is transmitted to the BER measurement circuit 1 via the antenna duplexer 4, the receiver 9, and the reproduction circuit 11.
9 and the switching information detection circuit 21. BER
The measurement circuit 19 measures the BER of the input signal in the determined section for each channel, and when the value is equal to or smaller than a certain threshold value, the switching request is output from the reproduction circuit 10 via the switching request multiplexing circuit 20 to the BER. At the same time, the station is deleted from the registered terminal station list 22.
At that time, the BER of stations not registered in the registered terminal list
Is not measured. Thus, the lower station having a bad BER starts communicating with another upper station. The switching information detection circuit 21 detects that the reception frequency of the lower station has changed, and deletes the station from the registered terminal list 22 based on the detected information.

[0008]

As described above, the present invention avoids the effects of interference and fading by switching the carrier frequency and antenna when the interference wave or fading exists around the station and the communication condition deteriorates. There is an effect that can be. In particular, when stations are installed in desert areas or mountain areas in rural communication systems, etc.
An enormous effect can be obtained for the relief of the communication disabled state.

[Brief description of the drawings]

FIG. 1 is a block diagram of one embodiment of the present invention.

FIG. 2 is a configuration diagram of a multipath communication line common to the present invention and a conventional example.

FIG. 3 is a block diagram of a conventional wireless communication device.

[Explanation of symbols]

 1, 2, 3 antenna 4, 5 antenna duplexer 6, 7 transmitter 8, 9 receiver 10, 11 reproduction circuit 12, 19 BER measurement circuit 13 switching information multiplexing circuit 14 reception frequency control circuit 15 reception antenna switching control circuit 16 Switching request detection circuit 17 Transmitter control circuit 18 Transmission antenna switching control circuit 20 Switching request multiplexing circuit 21 Switching information detection circuit 22 Registered terminal station list 31, 32, 33 Relay station

Claims (2)

(57) [Claims] 1. At least two pairs of transmissions with an upper station
In a multipath communication radio apparatus for transmitting / receiving a digital signal to / from a lower station using a pair of transmission / reception radio waves after input / output one of the received radio waves and reproducing the digital signal, a communication state from the upper station is determined. Means for monitoring, means for receiving the signal transmitted from the upper station, and means for separating the carrier frequency switching request signal multiplexed in the time slot of each frame, and for switching the carrier frequency by the carrier frequency switching request signal. And means for adjusting the transmission output and switching the antenna, and means for multiplexing the information of switching the carrier frequency in the time slot of each frame and transmitting the information to the upper station. Wireless device for multipath communication. 2. A means for monitoring a communication state of the lower station, a means for multiplexing a carrier frequency switching request signal to the lower station in a time slot of each frame of a transmission signal, and transmitting the multiplexed signal to the lower station. Means for receiving the transmitted signal and separating the carrier frequency switching information signal multiplexed in the time slot of each frame, and means for recording a registered terminal list updated at any time by the carrier frequency switching information signal The wireless device for multipath communication according to claim 1, comprising: