JPS63246039A - (1+1) frequency diversity radio transmitter-receiver - Google Patents

Abstract

PURPOSE:To contrive the saving of power consumption by controlling the transmission and stop of one transmission circuit among transmission circuits based on a reception level of a reception circuit. CONSTITUTION:Reception signal level information 30 received by a reception circuit 5 of an active system is sent to a reception signal discrimination circuit 20. The circuit 20, based on the information, compares the level with a preset level for the quantity. When the result of comparison is larger (that is, no fading or the like takes place), a control signal 41 is sent to turn off the power supply fed to a transmission circuit 14 of its own station, thereby stopping the operation. On the other hand, when the result of discrimination is smaller (fading takes place), the signal 41 turns on the power supply of the circuit 14 reversely. This operation applies to an equipment of opposite station similarly.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a 1-Brt1 wave number diversity radio transmitter/receiver, and particularly to a 1+1 frequency diversity radio transmitter/receiver that is capable of stable transmission and reception with low power consumption.

[Prior art] In the field of wireless communications, I
The +1 frequency diversity method is well known.

This is a method that can always obtain a stable reception level by taking advantage of the fact that radio channels of different frequencies have little correlation in fading. For this reason, wireless transmitter/receivers are widely employed when configuring wireless relay lines.

FIG. 2 is a block diagram of a conventional 1+1 frequency diversity wireless transmitter/receiver.

In the same figure, 101 and 111 are wireless signal input terminals;
02.112 is a wireless signal output terminal.

Also, 103. 104. 113. 114 are respectively different frequencies f la, f 2a, f
lb, f 2b transmitting circuit, 105, 106, 115
, 116 are these frequencies f la, f 2a,
This is a receiving circuit compatible with fH) and f2+3. In the above configuration in which 107 and 117 are switchers, a signal input from the wireless signal input terminal 101 is divided into two by the hybrid circuit, and the same signal is input to two transmission circuits 103 and 104, respectively. Then, in each of the transmitting circuits 103 and 104, the signal is converted into two radio frequencies fla and f2a, and transmitted to the game player.

The receiving circuits 105 and 106 of the opposing game receive the two radio frequencies fla and f2a separately, respectively.

Of these two received signals, the normally received radio frequency signal is selected to ensure normal signal reception at all times.

That is, the switch 107 normally selects the received signal of the receiving circuit 105, which is the current system, as the wireless signal. If a frequency diversity effect occurs due to fading or the like, the receiver circuit 106, which is a backup system, is selected.

Specifically, the transmission quality of the current system deteriorates significantly,
When the signal received by the receiving circuit 106 of the backup system becomes better than the signal received by the receiving circuit 105 of the active system, switching is made to the receiving circuit 106 of the backup system.

The above has been described for uplinks, but the same operation is performed for downlinks as well.

As a result, it is possible to construct a wireless transmitter/receiver that can always provide output at a stable reception level.

[Problems to be solved] The conventional 1+1 frequency diversity wireless transmitter/receiver described above always operates two wireless transmitter/receiver circuits even under normal and stable propagation conditions. There was a problem that power was consumed to operate the two wireless transmitter/receiver circuits.

Although it differs depending on the country, region, distance, etc., unstable propagation conditions (when fading occurs) are extremely rare compared to stable propagation conditions throughout the year, and are usually on the order of several percent. Despite this, the traditional 1+1
Frequency diversity wireless transmitting/receiving devices have always had to operate two transmitting circuits with different frequencies.

In particular, for relay stations without commercial power supply, highly reliable, long-term maintenance-free power supply equipment is desirable.

However, providing more power requires the use of unreliable generators or large-scale solar power sources, which can be difficult to maintain and expensive to construct. There were problems such as.

The present invention has been made in view of the above-mentioned problems, and an object thereof is to provide a 1+1 frequency diversity radio transmitting/receiving device capable of stable transmission/reception with low power consumption.

[Means for Solving Problems] In order to achieve the above object, the 1+1 frequency diversity radio transmitting/receiving device of the present invention includes a transmitting circuit and a receiving circuit, each of which constitutes a radio line of two different frequencies;
In the 1+1 frequency diversity radio transmitting/receiving device including a received signal selection circuit that switches the received signal output based on the receiving level of the receiving circuit, at least one of the transmitting circuits is selected based on the receiving level of the at least one receiving circuit. The configuration includes a transmission control circuit that controls transmission and stop of the transmission circuit.

[Example code] Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram of a 1+1 frequency wireless transmitter/receiver according to an embodiment of the present invention. In the figure, 1, 11
is the wireless signal input terminal, 2.12 is the wireless signal output terminal, 3, 4, 13°14 are the frequencies fla and f, respectively.
2a, fll), f2b transmitter circuit, 5, 6, 1
5.16 are frequencies f Ia, f 2a, respectively.
In the receiving circuit of f 1111 f 2b, 7 and 17 are switching devices. And 20.21 is the transmitting circuit 3°4.13
．． 14, a received signal determination circuit having a function of controlling power on/off; 30; 40, received signal level information of the receiving circuits 5 and 15; 3];

Reference numeral 41 is a control signal for turning on and off the power of the transmitting circuits 4 and 14.

In the above configuration, the signals manually input from the radio signal input terminal 1.11 are input manually to the two transmitting circuits 3, 4 or 13.14 of the own station. However, during normal times (only the transmitter circuit 3,130 that uses the radio frequencies fla and flb is turned on and sends out radio signals to the game), the other transmitter circuit 4 that uses the radio frequencies f2a and f2b is on. , 14 are kept in an off state.

In addition, input from the input terminal 1 is input manually, and the transmission circuit 3
The signal of the radio frequency fla sent to the opposing station is received by the receiving circuit 5 of the opposing station.

As the output of the received signal, the signal of the receiving circuit 5 of the current system is selected by the switch 7.

Further, received signal level information (for example, received electric field information) 30 received by the receiving circuit 5 of the current system is sent to the received signal determination circuit 20. The received signal determination circuit 20 is
Based on this received signal level information, the level is compared with a preset level (for example, squelch level) and determined.

If the comparison result is large (that is, if no fading has occurred and the reception level is stable), the control signal 41 is sent out and supplied to the transmitting circuit 14 of the own station. Turn off the power. and,
The operation of the transmitting circuit 14 is maintained in a stopped state.

On the other hand, when the result of this comparison is small (that is,
Conversely, when fading is occurring, the control signal 41 turns on the power supply to the transmitting circuit 14. Therefore, the transmitting circuit 14 sends out a signal of radio frequency f2b,
For the downlink, a normal 1+1 frequency diversity radio link is configured.

In addition, in exactly the same manner, the power supply to the transmitting circuit 4 of the game player is turned on or off by a signal inputted from the input terminal 11 and transmitted to the game player via the transmitter circuit 13.

Therefore, when the received signal level is small, a normal 1+1 frequency diversity radio line can be configured and a stable received signal level can be obtained due to the frequency diversity effect.

As described above, the present invention provides 1+1 frequency diversity
At least one received signal is monitored for the two wireless transmitting/receiving circuits constituting the wireless transmitting/receiving device, and when this level is higher than a preset level (e.g., squelch level) (i.e., in a stable low limit state), When there is no fading), the first wireless transmitter/receiver circuit (η,
On the other hand, when the received signal is small compared to the set level (when aging is occurring (in an unstable Buddhist eye state)) , a control function is added to operate the two wireless transmitter/receiver circuits by turning on the power or other means.

This operation is the same for the equipment operation of the other station that constitutes the 1+1 frequency diversity radio line. In other words, for most of the time in a stable propagation state, only one radio transmitting/receiving circuit is operated for the devices of the two stations forming the radio link. Therefore, the power consumed by the wireless relay device can be reduced by almost half.

The specific effects of reducing power consumption according to the present invention are as follows.

As an example, a wireless transmitter/receiver made by NEC with a radio frequency of 7 GHz, a transmission capacity of 1i34 Mb/S, and a transmission output of IW is:
The power consumption of one unit is approximately 47W.

Assume that fading occurs 5% of -days. In such a wireless line, 1 according to this embodiment
When using a +1 frequency wireless transmitter/receiver, the power consumption of the standby system is 47×0.05=2.35W. Comparing this between two relay stations opposed by a 1+1 frequency diversity radio line, in the conventional system, it is 47X4 = 188W, and when the system according to this embodiment is used, it is 47X2 + 2.35X2 = 98.7W.

As is clear from the above, according to this embodiment, a significant reduction in power consumption can be achieved.

[Effects of the Invention] As explained above, the present invention configures a wireless relay line by turning off the power supply that operates one of the two wireless transmitting/receiving devices when the wireless transmission path is normal. This has the effect of reducing the power consumption of the transmitting/receiving device.

Incidentally, the propagation state of a wireless transmission path is bidirectional, and when the received signal level of the own station is low, the received signal level of the opposing station is also generally low. Therefore, the present invention has the effect that transmission quality can be improved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a 1+1 frequency diversity wireless transmitter/receiver according to an embodiment of the present invention, and FIG.
This is a block of +1 frequency diversity radio transmitter/receiver. 3.4, 13, 14: Transmission circuit 5.6, 15, 16: Receiving circuit 7.17: Switching device 20.21: Received signal determination circuit

Claims (1)

[Claims] In a 1+1 frequency diversity radio transmitter/receiver, which includes a transmitting circuit and a receiving circuit that constitute radio lines of two different frequencies, and a received signal selection circuit that switches the received signal output based on the receiving level of the receiving circuit. A 1+1 frequency diversity radio transmitter/receiver, comprising: a transmission control circuit that controls transmission and stop of at least one of the transmitter circuits based on the reception level of the at least one receiver circuit.