JPH1155228A - Transmitter and receiver and transmitter/receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reduced-cost transmitter, receiver, and transmitter/ receiver with a simple configuration to deal with fading or interference waves. SOLUTION: In a receiver 2, #1 and #2 demodulating circuits 22 remove carrier wave components having a frequency received from a transmitter 1 through #1 and #2 BPF 21, and output Manchester-encoded demodulated signals 11h and 12h. Then, #1 and #2 Manchester decoding circuits 23 output code rule violation detection signals 14h and 16h from demodulated signals outputted by the #1 and #2 demodulating circuits 22, and Manchester decoded signals 13h and 15h. Then, #1 and #2 AND circuits 24 output decoded signals 17h and 18h for turning the signal level of the part with a signal error of the Manchester decoded signals 13h and 15h into '0' based on the code rule violation detection signals 14h and 16h. An OR circuit 25 synthesizes the decoded signals 17h and 18h.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmitter, a receiver and a transceiver for transmitting and receiving transmission information by superimposing transmission information on a plurality of carriers having different frequencies.

[0002]

2. Description of the Related Art Conventionally, an antenna diversity system has been adopted as a method for improving the reliability of transmission in a transceiver used for a line having many interference waves and fading.

[0003] The antenna diversity system uses at least two or more antennas and a receiver to receive one signal radio wave, and combines the signals received from the respective antennas to form a data signal transmitted by the transmitter. This is a method that obtains

Here, a change in a signal when an interfering wave or fading occurs during transmission is represented by amplitude shift keying (ASK: Amplification).
The following describes an example in which the itude shift keying) method is adopted.

As shown in FIG. 10, when an interference wave is received, when the signal level of the data signal is "1", "1" is output.
However, when the signal level is "0", the signal level of the data signal changes from "0" to "1".

When fading occurs, the signal level of the data signal is "0" when the signal level is "0", which is not a problem. However, when the signal level is "1", the signal level of the data signal is "1". "To" 0 ".

[0007]

However, in a wireless communication apparatus employing the above-described antenna diversity system, it is necessary to use at least two or more antennas and receivers to receive one signal wave. There is a problem that the antennas other than the antenna and the receiver, which are originally required only one, are useless, which leads to an increase in cost.

In view of the above problems, the present invention provides a transmitter, a receiver, and a transmitter / receiver that have a simple configuration for transmitting information to cope with fading and interference waves, and that have low cost in the apparatus itself. The purpose is to do.

[0009]

According to one aspect of the present invention, there is provided a transmitter for transmitting a plurality of carriers having different frequencies on which transmission information is superimposed. Manchester encoding means for encoding information into a Manchester code, carrier output means for outputting a carrier wave of each frequency, and the transmission information encoded in the Manchester code by the Manchester encoding means, output by the carrier wave output means Transmission information superimposing means for superimposing on the carrier wave of each frequency.

According to a second aspect of the present invention, in the first aspect of the invention, the carrier output means outputs a carrier in a wide band.

According to a third aspect of the present invention, there is provided a receiver for receiving a plurality of carriers having different frequencies on which transmission information is superimposed, wherein the receiver comprises a carrier having a different frequency received from another transmission source. A demodulating means for removing a carrier component and outputting a Manchester-encoded demodulated signal; and outputting a Manchester decoded signal from the Manchester-encoded demodulated signal output by the demodulating means. Among the demodulated signals, a Manchester decoded signal output unit that outputs a coding rule violation detection signal that specifies a position where a signal error is present and a position where no signal error is detected, and a code rule violation detection signal output from the Manchester decoded signal output unit is received. A decoded signal that outputs a decoded signal in which the level of a signal at a signal error is “0” in the Manchester decoded signal And combining the decoded signals output from the decoded signal output means for each carrier having a different frequency received from another transmitter and outputting transmission information transmitted by the other transmitter. And a decoding signal synthesizing means.

According to a fourth aspect of the present invention, in the third aspect of the present invention, the decoding signal output means includes: a coding rule violation detection signal output by the Manchester decoded signal output means;
An output value obtained by performing a logical AND operation with the Manchester decoded signal output by the Manchester decoded signal means is output as the decoded signal.

According to a fifth aspect of the present invention, in the third aspect of the present invention, the decoded signal synthesizing means performs an OR operation on the decoded signal output from the decoded signal output means, and outputs the output value to the other transmitter. Is output as the transmitted information transmitted.

According to a sixth aspect of the present invention, in the third aspect of the present invention, the Manchester decoded signal output means monitors the Manchester-encoded demodulated signal output from the demodulation means and establishes bit synchronization. To output the Manchester decoded signal.

According to a seventh aspect of the present invention, in the third aspect of the present invention, the Manchester decoded signal output means is configured such that the Manchester decoded signal output from the Manchester decoded signal output means is invalid. Synchronization is achieved by receiving a synchronization establishment timing signal from another Manchester decoded signal output means.

[0016] The invention according to claim 8 is a transmitter for transmitting a plurality of carriers having different frequencies on which transmission information is superimposed, and a receiver for receiving a plurality of carriers having different frequencies on which transmission information is superimposed. A transceiver comprising:
The transmitter, the Manchester encoding means for encoding the transmission information into a Manchester code, a carrier output means for outputting a carrier wave of each frequency, and the transmission information encoded in the Manchester code by the Manchester encoding means ,
Transmission information superimposing means for superimposing on the carrier of each frequency output by the carrier output means, wherein the receiver removes a carrier component for each carrier having a different frequency received from another transmission source. Demodulating means for outputting a Manchester-encoded demodulated signal and, from the Manchester-encoded demodulated signal output by the demodulating means,
A Manchester decoded signal output means for outputting a Manchester decoded signal, and outputting a coding rule violation detection signal for specifying a portion having a signal error and a portion having no signal error in the output demodulated signal; And a decoded signal output means for outputting a decoded signal for setting the level of a signal at a portion where a signal error is present in the Manchester decoded signal to "0" upon receiving the coding rule violation detection signal. And decoding signal combining means for combining the decoded signals output from the decoded signal output means for each of the received carrier waves having different frequencies to output transmission information transmitted by the other transmitter. .

According to the present invention, for each carrier having a different frequency received from another transmitter, a Manchester decoded signal output means outputs a coding rule violation detection signal for specifying a portion having a signal error and a portion having no signal error in the demodulated signal. Based on the coding rule violation detection signal, a decoded signal is output in which the level of the signal at the position where there is a signal error is "0". Thereafter, the decoded signals are combined for each carrier having a different frequency received from another transmission source, and the transmission information transmitted by the transmitter is reproduced.

In particular, since the demodulated signal output from the carrier demodulation means is Manchester-encoded, it is easy for the Manchester decoded signal output means to specify a portion where a demodulated signal has a signal error and a portion where no signal error exists. it can.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a transmitter, a receiver, and a transceiver according to the present invention will be described with reference to the drawings.

<First Embodiment> FIG. 1 shows a first embodiment according to the present invention.
It is a block diagram showing the composition of the transceiver of an embodiment.

The transmitter / receiver of this embodiment is for sampling the amplitude shift keying (ASK) system, and the transmitter 1 and the receiver 2 are configured as shown in FIG.

The transmitter 1 has a Manchester encoding circuit 11
, And # 1 and # 2 transmitting circuits 12 and # 1 and # 2 mixing circuits 13.

The Manchester encoding circuit 11 converts a transmission information 1h consisting of a baseband signal (see (1) in FIG. 2) into a Manchester code signal 2h (see (2) in FIG. 2).
Is output.

The # 1 transmission circuit 12 outputs a carrier wave 3h having a frequency f1, and the # 2 transmission circuit 12
Outputs a carrier wave 4h having a frequency f2 (f1 <f2).

Here, it is assumed that when the above-described fading or interference wave occurs, there is a frequency difference enough to form a correct sweater signal on the receiver side. It should be noted that the available frequency difference is naturally limited because the usable band is determined by the Radio Law.

The mixing circuit 13 of # 1 superimposes the transmission information 2h converted into the Manchester code on the carrier 3h of the frequency f1 output from the transmission circuit 12 of # 1. The mixing circuit 13
The signal 2h converted into the Manchester code is superimposed on the carrier wave 4h of the frequency f2 output from the # 2 transmission circuit 13.

The receiver 2 includes # 1 and # 2 band-pass filters (BPF) 21, # 1 and # 2 demodulation circuits 22,
# 1 and # 2 Manchester decoding circuits 23 and # 1 and # 2
, And an OR circuit 29.

# 1 bandpass filter (BPF) 21
Is the carrier 7 of frequency f1 received via the antenna 30
and outputs a carrier wave 9h from which noise has been removed, and a # 2 band-pass filter (BPF) 21
Outputs a carrier 10h obtained by removing noise from a carrier 8h having a frequency f2.

The demodulation circuit 22 of # 1 outputs the demodulated signal 11 obtained by removing the carrier component from the carrier 9h from which the noise output from the band-pass filter (BPF) 21 of # 1 has been removed.
h (see (3) of FIG. 2).
The demodulation circuit 22 of # 2 is provided with a bandpass filter (B
PF) Carrier 1 from which noise outputted from 21 is removed
A demodulated signal 12h (see (6) in FIG. 2) from which the carrier component has been removed from 0h is output.

As shown in FIG. 2 (3), when the signal level of the demodulated signal 11h decreases due to fading, all of the Manchester-coded signals at the time of fading out of the Manchester coded signals are all "0". It will be at the level.

As shown in FIG. 2 (6), when the signal level of the demodulated signal 12h becomes high due to the interfering wave, the signal at the position where the interfering wave is received among the Manchester-coded signals is changed. All are at the “1” level.

The Manchester decoding circuit 23 of # 1 performs
Of the Manchester-encoded demodulated signal 11h output from the demodulation circuit 22 of the above, outputs a Manchester-decoded signal 13h that has not been Manchester-encoded, and notifies the detection of an immediate violation of the Manchester code by fading. The signal 14h (hereinafter referred to as a coding rule violation detection signal 14h) ((4) in FIG. 2)
Reference) is output.

Here, as shown in FIG. 2 (4), the coding rule violation detection signal 14h is a high level signal "1" before fading occurs, and becomes low level when fading is detected. Signal "0", and after that, when the fading is eliminated, the signal again becomes a high level signal "1".

The # 2 Manchester decoding circuit 23 outputs
From the Manchester-encoded demodulated signal 12h output from the demodulation circuit 22 of FIG.
In addition to outputting h, a code rule violation detection signal 16h (see (7) in FIG. 2) notifying the immediate violation of the Manchester code is detected when an immediate violation of the Manchester code is detected due to an interference wave.

Here, as shown in FIG. 2 (7), the coding rule violation detection signal 16h is a high-level signal "1" before detecting an interference wave. The signal becomes a low-level signal "0", and then becomes a high-level signal "1" again when no interference wave is detected.

The # 1 AND circuit 24 outputs the Manchester decoding 13 output from the # 1 Manchester decoding circuit 23.
and AND operation of the code rule violation detection signal 14h and
The f1 system Manchester decoded signal 17h (see (5) in FIG. 2) is output, and the # 2 AND circuit 2
4 performs a logical product operation of the Manchester decoding 15h output from the Manchester decoding circuit 23 of # 2 and the coding rule violation detection signal 16h, and outputs the f2 system Manchester decoded signal 18
h (see (8) in FIG. 2).

Therefore, the f1 system Manchester decoded signal 17
As for h, the signal level becomes "0" at the time of fading, and the signal level of the f2 system Manchester decoded signal 18h becomes "0" when it receives an interference wave.

The OR circuit 25 performs a logical sum operation of the signal output from the # 1 AND circuit 24 and the signal output from the # 2 AND circuit 24, and outputs the final decoded signal 19h.
(See (9) in FIG. 2).

Therefore, the final decoded signal 19h is, as shown in FIG. 2 (9), the f2 system Manchester decoded signal 1 which is not affected by fading at the time of fading.
8h component appears, and the f1 system Manchester decoded signal 1 which was not affected by the interfering wave when the interfering wave was received.
An 8h component appears.

Next, the transmission / reception operation of the transceiver of this embodiment is divided into a transmitter and a receiver, and each will be described with reference to FIGS.

(1) Operation of Transmitter The Manchester encoding circuit 11 converts the transmission information 1h consisting of a baseband signal into a Manchester code signal 2h.
To the mixing circuit 13 of # 1 and the mixing circuit 13 of # 2.

When the # 1 mixing circuit 13 receives the signal 2h obtained by converting the transmission information 1h into the Manchester code from the Manchester encoding circuit 11, the # 1 mixing circuit 13 converts the signal 2h into the carrier 3h of the frequency f1 output from the # 1 transmission circuit 12. Transmission information 1h
Transmits a carrier signal 5h on which the signal 2h converted into the Manchester code is superimposed via a radio wave via the antenna 16.

On the other hand, when receiving the signal 2h from the Manchester encoding circuit 11, the # 2 mixing circuit 13
4h of the frequency f1 output from the transmitting circuit 12 of FIG.
And a carrier signal 6h in which a signal 2h is superimposed on the antenna 1
6 via a radio wave.

(2) Operation of Receiver The band-pass filter (BPF) 21 of # 1 and the band-pass filter (BPF) 21 of # 2 each have the frequency f1 transmitted from the transmitter 1 via the antenna 30.
From the carrier 5h and the carrier 6h of the frequency f2, and the noise-removed signals 9h and 10h
Are output to the demodulation circuits 22 of # 1 and # 2.

Thereafter, the # 1 demodulation circuit 22 converts the demodulated signal 11h from which the carrier component has been removed from the noise-removed signal 9h output from the # 1 bandpass filter (BPF) 21 into the # 1 Manchester signal. Output to the decoding circuit 23.

On the other hand, the demodulation circuit 22 of # 2 converts the demodulated signal 12h from which the carrier component has been removed from the noise-removed signal 10h output from the band-pass filter (BPF) 21 of # 2 into the Manchester # 2. Output to the decoding circuit 23.

The # 1 Manchester decoding circuit 23 outputs
When receiving the demodulated signal 11h from the demodulation circuit 22 of, the Manchester decoded signal 13h is output to the AND circuit 24 of # 1 and the above-described coding rule violation detection signal 14h is transmitted to # 1 of the AND circuit 24 of # 1.
Is output to the AND circuit 27.

On the other hand, also when the second Manchester decoding circuit 23 receives the demodulated signal 12h from the demodulation circuit 22 of # 2, it decodes the received demodulated signal 12h into an original Manchester-encoded base band signal. The signal 15h is output to the # 2 AND circuit 24, and the above-mentioned coding rule violation detection signal 16h is output to the # 2 A circuit.
Output to the ND circuit 24.

The # 1 AND circuit 24 performs an AND operation on the decoded signal 13h output from the # 1 1-Manchester decoding circuit 23 and the coding rule violation detection signal 14h, and converts the above-mentioned f1-related Manchester decoded signal 17h. The data is output to the OR circuit 25.

On the other hand, the # 2 AND circuit 24 outputs
Decoded signal 15 output from Manchester decoding circuit 23
h and a code rule violation detection signal 16h, and
The f2 system Manchester decoded signal 18h is output to the OR circuit 25.

The OR circuit 29 outputs the f1 Manchester decoded signal 17h output from the # 1 AND circuit 24,
The logical AND operation is performed with the f2 system Manchester decoded signal 18h output from the second AND circuit 24 to output the above-described final decoded signal 19h.

Next, a method of establishing synchronization performed by the Manchester decoding circuit constituting the transceiver of this embodiment will be described.

The reason why the transceiver of this embodiment must establish synchronization is that the Manchester decoding circuits 23 of # 1 and # 2 perform the Manchester-encoded demodulated signal 11
h, 12h, when decoding Manchester decoded signals 13h, 15h that are not Manchester codes, the demodulated signal 1h
This is because if a 1-bit synchronization shift occurs during 1h and 12h, the signal levels of the subsequent Manchester decoded signals 13h and 15h are inverted.

Therefore, the transceiver of this embodiment establishes synchronization as follows.

Before transmitting the frame of the transmission information, the transmitter 1 forms a transmission stop state (see FIG. 3A). Thereafter, a signal 20h indicating that there is transmission information is transmitted to the Manchester. When input to the encoding circuit 11 (see FIG. 3 (2)), before transmitting the transmission information as a Manchester-encoded signal, a frame synchronization signal (see FIG. 3 (1)) follows the bit synchronization signal. The Manchester-coded signal is transmitted by being superimposed on the carrier.

On the other hand, on the receiver 2 side, the Manchester decoding circuits 23 of # 1 and # 2 output the Manchester-encoded bit synchronization signal output from the demodulation circuit 22 (see FIG. 3).
(3)), outputs Manchester decoded signals 13h and 15h by performing Manchester decoding, and monitors the signal state.
If the signal level of 5h continuously becomes “0” for three signals, the demodulated signal 11
h, 12h are shifted (skipped) by one bit, and the Manchester decoded signals 13h, 1 whose signal level becomes "1"
5h (see FIG. 3 (4)).

If the signal levels of the Manchester decoded signals 13h and 15h are "1" and there are no coding rule violations, the Manchester decoding circuits 23 of # 1 and # 2 output the coding rule violation detection signals 14h and 14h. The signal of 16h is operated (signal level is set to "1") to establish synchronization.

After the synchronization is established in this way, the f1 system Manchester decoded signal 17h and the f2 system Manchester decoded signal 18h output from the # 1 and # 2 AND circuits 24 have the signal level of "1". The frame synchronization signal comes to be output after four consecutive ones (see FIG. 3).
(5)).

In the transmitting / receiving apparatus of this embodiment, the Manchester encoding circuits 23 of # 1 and # 2 respectively convert the demodulated signals 11h and 12h of the carrier waves having different frequencies f1 and f2 received from the other transmission modules 1 into the demodulated signals 11h and 12h. Code immediate violation detection signal 1 for specifying a portion with and without a signal error
4, 16h, and then the code immediate violation detection signal 1
Based on 4h and 16h, the # 1 and # 2 AND circuits respectively set the signal level at the signal error location to “0”.
And outputs Manchester decoded signals 13h and 15h.
Subsequently, the OR circuit 25 outputs the Manchester decoded signals 13h and 1h to set the level of the signal at the position where the signal error occurs to “0”.
In order to synthesize 5h, for example, as shown in FIG. 4, even if the carriers having the frequencies f1 and f2 (f1 <f2) are fading, the decoding decoded from the carrier having the higher frequency f2 is performed. The signal is composed of a decoded signal decoded from a carrier having a low frequency f1 in which no signal error occurs and fading and causing a signal error, and a high frequency f2 in which the signal error does not occur. By combining the decoded signal with the decoded signal decoded from the carrier, the signal error portion is restored, and the transmission data can be reproduced from the transmitter.

For example, as shown in FIG. 5, even when an interference wave (noise) enters a carrier having a frequency of f1, a carrier having a high frequency f2 is not affected by the interference. The decoded signal decoded from the carrier having the high frequency f2 has no signal error. Therefore, the decoded signal decoded from the carrier having the low frequency f1 at which the signal error has occurred due to the interference wave is generated. By combining the signal with a decoded signal decoded from a carrier having a high frequency f2 at which the signal error does not occur, the signal error portion is restored, and the transmission data can be reproduced from the transmitter.

In particular, since the # 1 and # 2 Manchester encoding circuits 23 respectively encode the demodulated signals 11h and 12h output from the # 1 and # 2 demodulation circuits into Manchester codes, respectively. # 1 and # 2
Of the demodulated signals 11h and 12h
It is possible to easily specify a portion where h has a signal error and a portion where h is not.

Therefore, the configuration of the transceiver of this embodiment can be simplified, and the cost of the apparatus can be reduced.

<Second Embodiment> FIG. 6 shows a second embodiment according to the present invention.
It is a block diagram showing the composition of the transceiver of an embodiment.

Here, among the components of the transceiver of this embodiment, the same components as those of the transceiver of the first embodiment are denoted by the same reference numerals, and the same reference numerals are assigned. Detailed description of the parts will be omitted.

The transmitter / receiver according to this embodiment uses the ASK method as in the first embodiment. However, the transmission information is transmitted between the transmitter 1 and the receiver 2 using a carrier having a frequency of f1 or f2. Is different from that of the transmitter and receiver of the first embodiment, in which f1, f2,.
.., The transmission information is transmitted by a carrier wave of the frequency fn.

Therefore, the transmitter of this embodiment has # 1
To #n oscillation circuits 12 and # 1 to #n mixing circuits 13 are provided.

On the other hand, the receiver of this embodiment also
# 1 to #n BPF 21 and # 1 to #n demodulation circuit 22
And the Manchester decoding circuits 23 of # 1 to #n,
#N AND 24 is provided.

In the transceiver of this embodiment, transmission information is transmitted by carrier waves of frequencies f1, f2,..., Fn. Can be stronger than the ones.

<Third Embodiment> FIG. 7 shows a third embodiment according to the present invention.
It is a block diagram showing the composition of the transceiver of an embodiment.

Of the components of the transceiver according to this embodiment, the same components as those of the transceivers of the first and second embodiments are denoted by the same reference numerals, and the components denoted by the same reference numerals. A detailed description of is omitted.

The transceiver of this embodiment comprises first and second
As in the embodiment, the ASK method is adopted, but unlike the transmitter and receiver of the second embodiment, the transmitter 1 is a broadband transmitter, and f1, f2, .., The transmission information 1h is transmitted using a carrier having a frequency of fn.

Therefore, in the transceiver of this embodiment, since the carrier is used in a wide band, the frequency interval of the carrier to be transmitted can be widened.

Therefore, even if a fading or interference wave is received, a demodulated signal output from the demodulation circuits 22 of # 1 to #n has no signal error, and as a result, an OR circuit is finally formed. In the signal synthesized and output at 25, the signal error portion is further repaired as compared with those of the transceivers of the first and second embodiments, and the transmission data can be reproduced from the transmitter.

<Fourth Embodiment> FIG. 8 shows a fourth embodiment according to the present invention.
It is a block diagram showing the composition of the transceiver of an embodiment.

Here, among the components of the transceiver of this embodiment, the same components as those of the transceiver of the first embodiment are denoted by the same reference numerals, and the Manchester decoding circuit 23 of the receiver 2 is attached. Except for, the detailed description of the components denoted by the same reference numerals is omitted.

Generally, there is an error between the clock frequency on the transmitter side and the clock frequency on the receiver side, so that the synchronization may be shifted.

Therefore, in the transmitting / receiving device of the first embodiment,
At the time when the synchronization is lost, even if the Manchester decoding circuits 23 of # 1 and # 2 perform Manchester decoding of the demodulated signals 11h and 12h output from the demodulation circuits 22 of # 1 and # 2, the Manchester decoded signals Since it is not guaranteed that 13h and 15h are normal, it cannot be guaranteed that the coding rule violation signals 14h and 16h are also normal.

In the transmitting and receiving apparatus of the fourth embodiment, one of the Manchester decoding circuits 23 of # 1 or # 2 that normally receives signals is output from one of the Manchester decoding circuits 23 in an abnormal signal output state so as not to become abnormal. By outputting the synchronization timing signal 23h to the, the Manchester decoding circuit 23 in an abnormal state is adjusted to a normal signal output state.

For this reason, # 1 and # 2 AND circuits 26 to be described later are newly provided in the transceiver of the first embodiment, and the # 1 and # 2 Manchester decoding circuits 23
The following describes the unique functions possessed by.

Here, for the sake of simplicity, it is assumed that the Manchester decoded signal 15h output from the # 2 Manchester decoding circuit 23 is continuously shifted and is an invalid signal.

The transceiver of this embodiment establishes synchronization as follows.

The transmitter 1 forms a transmission stop state before transmitting a frame of transmission information (see FIG. 9A). Thereafter, a signal 20h indicating that there is transmission information is sent to Manchester. When input to the encoding circuit 11 (see FIG. 9 (2)), before transmitting the transmission information as a Manchester-encoded signal, a frame synchronization signal (see FIG. 9 (1)) follows the bit synchronization signal. The Manchester-coded signal is transmitted by being superimposed on the carrier.

On the other hand, on the receiver 2 side, the Manchester decoding circuit # 1 performs Manchester decoding on the Manchester-encoded bit synchronization signal output from the demodulation circuit 22 (see FIG. 9C). And outputs the Manchester decoded signal 13h and monitors the signal state. If the signal levels of three Manchester decoded signals 13h become "0" consecutively, the synchronization signal 21h is set to # 1.
(See FIG. 9 (5)), and the signal to be decoded thereafter is demodulated signal 11
h is shifted (skipped) by one bit to form a Manchester decoded signal 13h whose signal level becomes "1" (see FIG. 9 (4)).

In the # 1 Manchester decoding circuit 23, the signal level of the Manchester decoded signal 13h becomes "1".
If there is no code rule violation, the signal of the code rule violation detection signal 14h is operated (the signal level is set to "1") to establish synchronization.

On the other hand, when the # 1 AND circuit 26 receives the synchronization signal 21h from the Manchester decoding circuit 23, the AND circuit 26 performs a logical product operation of the signal 21 and the coding rule violation detection signal 14h, and the signal level of the output value is changed. When it is “1”, a synchronization establishment timing signal 23h is output to the Manchester decoding circuit 23 of # 2.

The # 2 Manchester decoding circuit 23 outputs
When the synchronization establishment timing signal 23h is received from the AND circuit 26, the demodulated signal 12h received from the demodulation circuit 22 of # 2 is received.
h by Manchester decoding to obtain a Manchester decoded signal 15
form h to escape from the invalid signal state.

In the transmission / reception apparatus of this embodiment, even if the Manchester decoded signal 15h output from the Manchester decoding circuit 23 of # 2 is in an invalid state, the Manchester decoding circuit 23 of # 2 is operated by the AND circuit of # 1. In response to the synchronization establishment timing signal 23h received from the controller 26, the synchronized Manchester decoded signal 16 is output and the coding rule violation detection signal 16h is output.

For this reason, the transmitting / receiving device of this embodiment
Both # 1 and # 2 Manchester decoding circuits 23
Synchronization has been established, and the reliability can be improved as compared with the transmission / reception device of the first embodiment.

[0089]

As described above, according to the present invention, for each carrier having a different frequency received from another transmitter, the Manchester decoded signal output means specifies a code for specifying a portion of the demodulated signal having a signal error and a portion having no signal error. An immediate violation detection signal is output, and based on the code immediate violation detection signal, a decoded signal is output which sets the level of the signal at a location where a signal error occurs to “0”. Thereafter, the decoded signal for each carrier having a different frequency received from another transmission source can be combined to reproduce the transmission information transmitted by the transmitter.

Further, since the demodulated signal output from the carrier demodulation means is Manchester-encoded, the Manchester decoded signal output means can easily specify a portion having a signal error in the demodulated signal and a portion having no signal error. Therefore, the configuration for the transmission information to cope with fading and interference waves can be simplified, and the cost of the apparatus itself can be reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a transceiver according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram illustrating signals output from respective components of the transceiver according to the first embodiment.

FIG. 3 is an explanatory diagram for establishing synchronization of a Manchester decoding circuit of the receiver in FIG. 1;

FIG. 4 is an explanatory diagram illustrating that the transceiver of the first embodiment is resistant to fading.

FIG. 5 is an explanatory diagram for explaining that the transceiver of the first embodiment is resistant to an interfering wave.

FIG. 6 is a block diagram showing a configuration of a transceiver according to a second embodiment of the present invention.

FIG. 7 is a block diagram showing a configuration of a transceiver according to a third embodiment of the present invention.

FIG. 8 is a block diagram showing a configuration of a transceiver according to a fourth embodiment of the present invention.

FIG. 9 is an explanatory diagram illustrating states of signals when the Manchester decoding circuit in FIG. 8 establishes synchronization.

FIG. 10 is an explanatory diagram illustrating a change in a signal when an interference wave and fading occur.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ASK transmitter 11 Manchester encoding circuit 12 Oscillation circuit 13 Mixing circuit 2 ASK receiver 21 BFP (Bandpass filter) 22 Demodulation circuit 23 Manchester decoding circuit 24, 26 AND circuit 25 OR circuit

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI H04L 27/06 H04L 27/06 Z

Claims (8)

[Claims] 1. A transmitter for transmitting a plurality of carriers having different frequencies on which transmission information is superimposed, a Manchester encoding means for encoding the transmission information into a Manchester code, and outputting a carrier of each frequency. Carrier output means, and transmission information superimposing means for superimposing the transmission information coded into the Manchester code by the Manchester encoding means on a carrier of each frequency output by the carrier output means. And the transmitter. 2. The transmitter according to claim 1, wherein said carrier output means outputs a carrier in a wide band. 3. A receiver for receiving a plurality of carriers having different frequencies on which transmission information is superimposed, said receiver comprising: for each carrier having a different frequency received from another transmission source, a carrier component; Demodulation means for outputting a demodulated signal subjected to Manchester encoding by removing, from the demodulated signal Manchester encoded output by the demodulation means, and output a Manchester decoded signal, of the demodulated signal output, A Manchester decoded signal output unit that outputs a coding rule violation detection signal that specifies a position where a signal error exists and a position where no signal error occurs, and a code rule violation detection signal output from the Manchester decoded signal output unit. Decoded signal output means for outputting a decoded signal that sets the level of a signal at a location where a signal error occurs to “0”. Decoding signal combining means for combining decoded signals output from the decoded signal output means for each carrier having a different frequency received from another transmission source, and outputting transmission information transmitted by the other transmitter; A receiver comprising: 4. The decoded signal output means outputs an AND value of a coding rule violation detection signal output by the Manchester decoded signal output means and a Manchester decoded signal output by the Manchester decoded signal means,
4. The signal output as the decoded signal.
The receiver described. 5. The decoded signal synthesizing unit outputs an output value obtained by performing a logical sum operation on the decoded signal output from the decoded signal output unit as transmission information transmitted by the other transmitter. Item 3. The receiver according to Item 3. 6. The Manchester decoded signal output means monitors the Manchester-encoded demodulated signal output from the demodulation means and outputs the Manchester decoded signal with bit synchronization. Item 3. The receiver according to Item 3. 7. The Manchester decoded signal output means receives a synchronization establishment timing signal from another Manchester decoded signal output means even if the Manchester decoded signal output from the Manchester decoded signal output means is in an invalid state. 4. The receiver according to claim 3, wherein the receiver performs synchronization. 8. A transceiver comprising: a transmitter for transmitting a plurality of carriers having different frequencies on which transmission information is superimposed; and a receiver for receiving a plurality of carriers having different frequencies on which transmission information is superimposed. The transmitter includes: a Manchester encoding unit that encodes the transmission information into a Manchester code; a carrier output unit that outputs a carrier wave of each frequency; and the transmission information encoded into a Manchester code by the Manchester encoding unit. And transmission information superimposing means for superimposing on the carrier of each frequency outputted by the carrier output means, wherein the receiver comprises, for each carrier having a different frequency received from another transmission source, Demodulating means for removing a component and outputting a Manchester-encoded demodulated signal; and A Manchester decoded signal output means for outputting a Manchester decoded signal from the demodulated signal and outputting a coding rule violation detection signal for specifying a portion having a signal error and a portion having no signal error in the output demodulated signal; Receiving a coding rule violation detection signal output from the decoded signal output means, a decoded signal output means for outputting a decoded signal that sets the level of a signal at a portion where a signal error is present in the Manchester decoded signal to “0”; A decoded signal synthesizing means for synthesizing decoded signals output from the decoded signal output means for each carrier having a different frequency received from another transmission source and outputting transmission information transmitted by the other transmitter. A transmitter / receiver, comprising: