JPS5881343A - Duplex transmitter and receiver for controlling transmission output according to intensity of received electric field - Google Patents

Abstract

PURPOSE:To reduce the power consumption of a radio equipment, by varying the transmission output level of the transmitter of radio duplex transmitting and receiving equipment in inverse proportion to the received level of a received signal. CONSTITUTION:The radio equipment in the figure receives a radio signal fR from an opposite station at an antenna 6 and supplies it to a reception part 3 through an antenna common-use device 2. The reception part 3 outputs its demodulated signal to a terminal 8 and also applies part of the intermediate frequency to a received electric field intensity detecting circuit 4. The circuit 4 controls the output level of a transmission part 1 through a transmission output control circuit 5 so that the transmission output level from the transmission part 1 is decreased when the intensity of the received electric field increases, or increased when decreases. This radio equipment is suitably used as mobile radio equipment which uses batteries as a power source.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to reducing the power consumption of a simultaneous transmitting/receiving wireless communication system comprising a pair of transmitters and receivers performing opposing communications using AM or FM radio waves.

Conventional simultaneous transmitting/receiving radios normally transmit at rated output at all times, but this is a wasteful method in the case of a mobile type where the distance between two opposing radios changes. In contrast, the present invention provides a signal-to-noise ratio (S/
The purpose is to reduce the power consumption of the wireless transmitter by reducing the transmission output in areas with excessive quality where N) is larger than necessary, and when the received electric field is strong, the transmission power is inversely proportional to the strength. The advantage is that the power consumption of the simultaneous receiver is reduced linearly or stepwise, and most of the power consumption in the simultaneous receiver is in the transmitter, so it is extremely effective in reducing power consumption.

The present invention will be specifically explained below with reference to the drawings.

FIG. 1 is a side view of the configuration of a simultaneous transmitting/receiving radio device embodying the present invention. In the present invention, if the opposing simultaneous transmitting/receiving radios are A and B, for example, only A should be configured as shown in Fig. 1. For example, a portable transmitter/receiver that receives power from a battery with a small current capacity is often selected as the A. In Fig. 1, l is a transmitting section, 2 is an antenna duplexer, 8 is a receiving section,
4 is a reception field strength detection circuit, 5 is a transmission output control circuit, 6
is a transmitting and receiving antenna, 7 is a modulated signal input, 8 is a demodulated signal output, f is a transmitted radio wave, and fR is a received radio wave. The received radio wave fR from the 6 radio is received by the antenna 6, passes through the duplexer 2, and is demodulated by the receiver 3 to obtain the demodulated signal output 8. However, a part of the output converted to the intermediate frequency in the receiver 3 is input to the six electric field strength detection hands. This detector has, for example, a reception input of 35 dBμ (
The case of 55 μV in 35 dBμ with reference to 1 μV) is set as the threshold value vt, and when the fR wave large input is 85 dBμ or more, a binary symbol “l” is output, and the transmission output control circuit 5 outputs it. In response, the output of the transmitter 1 is reduced, for example 0. Controlled by IW.

Next, when the input to the receiving radio wave stock is a weak electric field smaller than 85 dBμ, the output of the field strength detector 4 is the binary sign “0”.
'', and the transmission output control circuit 5 controls the output of the transmitter 1 at this time so that it becomes the rated output lW.

FIG. 2 is a diagram showing the relationship between the received radio wave strength and the corresponding transmission power to explain the above operation.Characteristic A shows the transmission power from P to P when the received radio wave strength reaches the threshold value vt. (for example, P1=lW, Po=0.1 W). Furthermore, the b characteristic shows an example in which a threshold value is not provided in the electric field strength detector, and the transmission output is controlled so as to be linearly inversely proportional to the received electric field strength.

In the above explanation, the rated output P0 of the transmitter is referred to as IW and the reduced output P0. 0. Although IW is used, the value of Po may be arbitrarily selected, and a significant power saving can be expected.

Desired is that the present invention is adopted only in one transmitter/receiver of opposing wireless communication systems, and that the electric field strength of the radio wave f of the own station at the other station is equal to the electric field strength of the fR wave of the other station at the own station. Assuming that, in general, stations A and B are relatively close to each other and have the same rated transmission output (including the antenna), and it is most suitable when the distance between the two stations changes.

Furthermore, by implementing the present invention, when the received electric field is strong, it is possible to automatically reduce the transmitting output in inverse proportion to the strength, so power consumption can be reduced, and for good communication, excessive transmitting power is required. It is also effective in preventing rain interference as it suppresses and suppresses interference.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of the configuration of a simultaneous transmission radio device embodying the present invention, and FIG. 2 is a diagram showing the operating characteristics of FIG. 1. ■...Transmission unit, 2...Antenna duplexer, 3.
. . . Receiving unit, 4. . . Reception field strength detection circuit, 5
...Transmission output control circuit, 6...Antenna, 7
...Modulation signal manually, 8...Demodulation signal output. Agent Otama 1 person from outside the university ηI Figure 2 Continuation of Figure 1 page 0 Applicant Kokusai Denki Co., Ltd. 1-22-15 Toranomon, Minato-ku, Tokyo

Claims (1)

[Claims] One transmitter/receiver of a communication system consisting of a pair of simultaneous transmitters and receivers that performs opposing communications (-a receiving field strength detector and a transmitting output control circuit that controls its own transmitting power based on its output, The received electric field strength (
Simultaneous transmitting and receiving device that controls transmitting output from two