JPS58182338A - Data transmitter and receiver - Google Patents

Abstract

PURPOSE:To attain highly efficient communication having no useless time and less error, by providing a time generator generating the same time to each transceiver and making the start timing of transmission and reception clear at an adding and averaging processing. CONSTITUTION:A data set device 1 sets data to be transmitted at the transmission, a transmission request signal is outputted to a transmission and reception switching device 7 and a data transmission request signal representing the presence of the transmission data is outputted to a gate 6, respectively. A clock 4 inputs modifying information of the timing from an optimum timing setting device 5 and forms the required timing according to it. At the reception, signals are received at a transceiver 9 made receptionable by the device 7 from an antenna 10, they are detected by a detector 11, converted into a digital signal in the sampling synchronism in the extent not losing the amount of information, and the number of times of processing of addition and averaging and the starting period of the addition are controlled by a controller 3. When the addition and averaging are finished, the mean value by the addition is inputted to an interpreting device 14, the content of information transmitted based on the inputted adding mean value and outputted by using a display 15.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a data transmitting/receiving device that performs averaging processing, and particularly aims to extremely efficiently extract signals buried in noise and improve communication efficiency.

Generally, when noise is superimposed on a signal that changes periodically, averaging processing is used to detect signal components from the signal. As shown in Fig. 1, the averaging process involves adding periodically changing signals (a) in synchronization with the period (b) to generate an added signal (Q).
This is the process of dividing this by the number of additions to obtain the average value (d). It is well known that by performing this averaging process, the signal-to-noise ratio is improved in proportion to the square root of the number of times of averaging, compared to when the averaging process is not performed. However, in order to perform averaging processing, as can be seen from Figure 1, a synchronization signal that is synchronized with the sent signal is required, and if the transmitting side does not know when to start transmitting data, I don't know at what point I should start adding average. When the signal level is particularly low (S/N ratio is poor), it has been difficult to know these synchronization signals and start timing on the receiving side, which performs averaging processing (for example, when there is a partner station). In this case, it is necessary to start averaging from the time when no signal is being transmitted, and perform sufficient averaging after a signal component appears in the average value. S Detection and deciphering of the signal took a very long time, partly due to the poor quality of /11.

The present invention solves the above-mentioned conventional drawbacks, and improves efficiency by making the start time of a signal clear on both sides of the transmitting and receiving sides, and by transmitting and receiving a sufficient number of times necessary for signal detection when averaging on the receiving side. The present invention provides a data transmitting/receiving device capable of performing communications.

The operating principle of the present invention and the operation of the embodiments will be explained using FIGS. 2 to 6. A plurality of data transmitting/receiving devices are equipped with clocks whose time coincides with each other, and the timing of transmission and reception is determined by the clocks. This makes it clear when all data transmitting and receiving devices start transmitting and receiving.
Using this clock, it is possible to synchronize the transmission and reception intervals among all data transmitting and receiving devices. Figure 2 shows this situation. In the figure, there are four data transmitting/receiving devices M to D, and the timing of transmitting and receiving and the interval thereof are all determined by an internal clock.

At transmission/reception start times T1 and T2, M transmits and the others receive; at T3, C transmits; at T4, B transmits; at T5, D transmits;
It is shown that all data transmitting/receiving devices that are not transmitting at each time are in a receiving state.

Next, for the sake of simplicity, the optimum number of times of addition and averaging will be described with reference to FIG. 3 in the case where there are two data transmitting/receiving devices. Figure 3 (2L) shows how the white noise is transmitted N times so that it can be sufficiently suppressed by averaging, and the signal is continuously transmitted while taking into account the signal decoding time τ0 on the receiving side. There is. The signal is sent to the receiving side N times, but when there is little noise or the mutual distance is close and the S/N is good, as shown in Fig. 3(b), the signal is sent N times.
It is possible to sufficiently decode the signal with n<, N) times of addition and averaging; that is, the time τ1 after decoding is wasted time, leading to a decrease in communication efficiency. Here, the receiving side sends back information to the transmitting side that the number of times necessary and sufficient to decode the signal is n, and the sending side sends the same n number of transmissions, thereby shortening the transmission interval by 11 minutes.

Communication can be performed with higher efficiency. The present invention aims to create an interval between transmission and reception that does not cause wasted time between transmission and reception, as shown in the figure (C) showing the transmission state and (d) the reception state. be. Specifically, on the receiving side, the optimal number of averaging times is updated and sent back to the transmitting side when the reception condition worsens or if the number of averaging times changes. A method of always maintaining communication reliability by changing each other will be explained using FIG. 4. Assuming that the time required to send data once is tc, the number of averaging times required for the receiving side to decode the signal is nt, and the time for decoding the signal after the averaging process is tr, then the transmission/reception timing interval is T. It is expressed as T=ntXtc+tr. This T can be changed every time nt is changed.

Next, if multiple data transmitters/receivers all have the same reception state, the above interval T is sufficient, but it is natural that there are cases where the reception states are different, and there may be receiving stations that require a large number of averaging operations. It will be done. In such a case, how to determine the timing interval for transmission and reception will be explained based on FIG. 6th
Figure (&) shows the number of addition and averaging times when transmitting/receiving device B receives a transmitted signal from another transmitting/receiving device and deciphers the signal, and (b) in the same figure shows the number of times nt required for decoding the signal. The average number of additions nim is shown. Here, if ntB > ntB, the transmission/reception timing interval T is set to
If only = ntm x tc-4-tr, it can be realized with a simple configuration without introducing unnecessary complexity to each device. FIG. 6 shows the state of transmission and reception at this time. FIG. 6 (&) shows the operation of the transmitting/receiving device 5, with the upper part showing the transmission of MU and the lower part showing the reception of MU. FIG. 2B shows the operating state of the transmitting/receiving device B. FIG. When transmitting/receiving device B receives, there is wasted time t1oss, which is caused by
On the contrary, it is effective if it is used to match the transmission and reception timing between both transmitting and receiving devices B.

A block diagram of an embodiment of the present invention is shown in FIG. 7 and will be explained. 1 is a data setting device that sets data to be transmitted, and does not generate output when receiving data. 2 is an encoder that converts the parallel digital signal set at the time of transmission into a serial digital signal. 3 is a control device which uses a clock signal from a clock 4 to control an encoder 2 and an averaging device 1 which will be described later.
Control 3. 6 is an optimum timing setting device for setting the optimum timing for transmission and reception; 6 is a gate; and 7 is a transmission/reception switching device. A modulator 8 modulates the serial digital data output from the encoder 2 and inputs it to the transmitter/receiver 9. 1o is an antenna used for both transmission and reception. 11 is a detection device that receives and detects a signal from a transmitting/receiving device during reception;
12 is a MU/D converter that converts the detection output (analog data signal) into a digital signal at a sampling period that does not lose the amount of information; 13 is an averaging device that can control the number of I'i averaging operations; 14; 16 is a decoding device that discriminates the signal from the average value, and 16 is a display device that displays the decoded signal. Below, we will explain in the order of transmission, reception, and timing interval changes/settings.

First, at the time of transmission, the data setting device 1 sets the data to be transmitted, outputs the set parallel digital data to the encoder 2, outputs a transmission request signal to the transmission/reception switching device 7, and outputs the transmission request signal to the gate 6. Each outputs a data transmission request signal indicating the presence of data. Encoder 2 receives the set parallel digital data, and the control device 3 controls the transmission start timing and number of times of transmission, converts it into serial digital data, and outputs it to modulation device 8 .

The clock 4 inputs timing change information from the optimum timing setting attachment 5 and creates the necessary timing in accordance with this information. The gate 6 receives the average number of times necessary for decoding on the optimum timing setting device 5 and the receiving device side as the number of transmissions, and sends a transmission request and the number of transmissions to the control device 3 using the data transmission request signal from the data setting device 1. Output. Therefore, the control device 3 receives the transmission start timing from the clock 4, and inputs the transmission request signal and the number of times of transmission from the gate 6 to control the encoder 2. Furthermore, the modulated output of the modulation device 8 is input to the transmitting/receiving device 9, and is switched to the transmitting state by the transmitting/receiving switching device 7, and the antenna 1o
Sent from The above is a series of operations of each device related to transmission at the time of transmission. Note that when no transmission is performed, the transmission request signal from the data setting device 1 disappears, and the series of devices described above moves to the reception timing state through the transmission/reception switching device 7 and the gate 6.

At the time of reception, a signal is received from the antenna 1o by the transmitting/receiving device 9 which has been put into a receiving state by the transmitting/receiving switching device 7, and is detected by the detection device 11, and the output is transmitted to the converter 12 to the extent that one piece of information is not lost. is converted into a digital signal with a sampling period of The output of the Muyu converter 12 is sent to the averaging device 13.
The averaging device 13 controls the addition start timing and the number of averaging operations by the control device 3 which is in the receiving state. This control device 3 has a different control content than when transmitting, and receives a transmission request from the gate 6.

Instead of the number of transmissions, it receives a reception request and the number of times of addition and averaging, controls the addition and averaging device 13 (9), and at this time puts the encoder 2 in a stopped state. Note that during transmission, the averaging device 13 is stopped by the control device 3. When the averaging is completed, the output of the averaging is sent to the decoding device 14.
The content of the transmitted information is detected based on the inputted average value, and is output using the display device 16.

A series of reception and decoding operations are performed at each transmission start timing, and if a signal is detected, output is performed.

In order to set the optimum timing interval, the following operations are performed on the transmitting side and the receiving side, along with setting the averaging and the number of transmissions. Let N be the number of additions that can sufficiently suppress white noise. The transmission/reception timing is set to 7 for these N times, and a search is made to find out how many times the transmitting/receiving devices can decode the information transmitted by the other party. The decoding device 14 determines how many times the information transmitted by the transmitting side can be decoded and sends it to the optimum timing setting device 5. Optimum timing setting device 6
retains the number of times and sends it back to the transmitting side through the transmission/reception switching device. The transmitting side decodes the returned number of times and inputs it to the transmitting side's optimum timing setting device, so that the receiving side can use the average number of times required to decode the signal as information on the transmitting number of times. This number of transmissions can be set as information on the average number of times when the user is on the receiving side.

Based on this information, the optimum transmission/reception timing interval can be obtained as shown in FIG. This interval is changed every time the number of times of transmission and averaging is changed. That is, it is changed every time the reception condition deteriorates or at a fixed time interval.

As described above, in the transmission of digital data, the present invention provides each transmitter/receiver with a time generator with the same time,
When performing arithmetic averaging, the start timing of transmission and reception is clarified, and the receiving side detects the sufficient number of arithmetic averaging times for decoding the signal. This allows the interval between the start timings of the receiving and transmitting sides to be controlled, thereby eliminating errors. This enables highly efficient communication with less time and no wasted time.

[Brief explanation of the drawing]

Figures 1 (iL) to (d) are waveform diagrams illustrating the operation of averaging processing in a conventional data transmitter/receiver, and Figure 2 illustrates the operating principle of the present invention and shows the transmission/reception status between multiple devices. Waveform diagrams, Figures 3 (a) to (d) Figure 4 waveform diagrams illustrating the operation of changing the timing of U transmission and reception. FIG. 6 (&), (b) is a waveform diagram explaining the method of determining Fi timing, FIG. 6 (iL), (b) is a waveform diagram showing the transmission and reception timing, and FIG. 7 is an embodiment of the present invention. FIG. 1...Data setting device, 3...Control device, 4...Clock, 5...Optimum timing setting device, 9...Transmission/reception device , 13...
- Addition iP': equalization device, 14... decoding device. Name of agent: Patent attorney Naoto Nakao and one other person

Claims (1)

[Claims] A data sending device, a receiving device, an averaging device, a control device for controlling the sending device, the receiving device, and the averaging device, and a time generator for giving timing for starting transmission and reception to the control device. a timing setting device for causing the time generating device to change the timing, and a signal decoding device for decoding the output of the averaging device, and synchronizing the timing of transmission and reception between a plurality of data transmitting and receiving devices. The system is characterized in that it is configured such that a sufficient number of addition and averaging times necessary for signal decoding is obtained from the output of the signal decoding device, an interval between transmission and reception timings is set in the timing setting device, and transmission and reception are performed using the number of addition and averaging times. data transmitting and receiving device.