JPH0819053A - Data communication equipment - Google Patents

Abstract

PURPOSE:To attain the transmission of a signal with a small power at a low error rate by setting a carrier frequency set by a frequency conversion circuit to be a frequency with a small number of simultaneous communication channels based on a carrier frequency with a small interference level. CONSTITUTION:The information sent from an external voice encoder or the like are converted by a frequency conversion circuit 10 into a desired carrier frequency in a transmission section 8 and sent from a transmission antenna 9. In the case of the transmission in which a low error rate is required, the frequency conversion circuit 10 sets a transmission frequency of a data transmission channel to a frequency with a small number of simultaneous communication channels based on a carrier frequency with a small interference level sought by an interference measurement circuit 7 built in a reception section 1 with an instruction of an information transmission classification setting circuit 14. Then the information related to the transmission frequency of the data transmission channel is reported to a reception section being an object of data transmission through a common control channel in which a frequency and a spread code are set fixedly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data communication device for performing data communication while moving.

[0002]

2. Description of the Related Art FIG. 3 is a schematic block diagram of a conventional CDMA data communication apparatus. In FIG. 3, 15 is a receiving unit,
16 is a receiving antenna, 17 is a frequency converting circuit, 18 is a demodulating circuit, 19 is a despreading circuit, 20 is a receiving information interface circuit, 21 is a transmitting unit, 22 is a transmitting antenna, 23 is a frequency converting circuit, 24 is a modulating circuit, 25 is a diffusion circuit, 2
Reference numeral 6 is a transmission information interface circuit.

Next, the relationship between the components of the conventional example and the operation thereof will be described. In the receiving unit 15,
The signal received by the receiving antenna 16 is the frequency conversion circuit 1
7, a baseband signal is converted, a demodulation circuit 17 demodulates, a despreading circuit 19 despreads, information is reproduced,
The reproduced reception information is received information interface circuit 20.
Output to an external audio decoder or the like. Transmitter 21
In the above, information to be transmitted from an external audio encoder or the like is connected to the transmission unit 21 via the transmission information interface circuit 26, spread by the spreading circuit 25, modulated by the modulating circuit 24, and then by the frequency converting circuit 23. It is converted to a desired carrier frequency and transmitted from the transmitting antenna 22.

[0004]

However, in the above-mentioned conventional CDMA system data communication apparatus, information transmissions having different required error rates such as data transmissions and voice transmissions are mixed.
When the CDMA system and the FDMA system are used together, or the CDM
In the case of using the A system and the TDMA system together, the transmission power needs to be increased when transmitting information that requires a small error rate, which has the drawback of increasing the power consumption, volume, and weight of the transmission unit. there were.

The present invention solves such a conventional problem, and an object thereof is to realize a low error rate transmission with a small transmission power in a CDMA data communication apparatus.

[0006]

In order to achieve the above object, the data communication apparatus according to claim 1 is a CDMA system and an FDMA system in which information transmissions having different required error rates such as data transmission and voice transmission are mixed. In the data communication using together, the receiving section is provided with an interference measuring circuit for measuring a carrier frequency having a small interference level from the received signal, and the transmitting section is provided with
When a low error rate is required, the carrier frequency to be set by the frequency conversion circuit is instructed to be set to a frequency with a small number of simultaneous communication channels based on the carrier frequency with a small interference level measured by the interference measurement circuit. By providing the information transmission type setting circuit, it is possible to perform transmission with a low error rate with a small transmission power.

[0007]

With the structure of claim 1, in the CDMA data communication device, it is possible to realize low error rate transmission with small transmission power, and the power consumption, volume, and
This has the advantage that the increase in weight can be reduced.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A data communication device according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of a data communication device according to a first embodiment of the present invention. 1, 1 is a receiving unit, 2 is a receiving antenna, 3 is a frequency conversion circuit, 4 is a demodulation circuit, 5 is a despreading circuit, 6 is a reception information interface circuit, 7 is an interference measurement circuit, 8 is a transmission unit, and 9 is a transmission unit. Is a transmission antenna, 10 is a frequency conversion circuit, 11 is a modulation circuit, 12 is a spreading circuit, 13 is a transmission information interface circuit, and 14 is an information transmission type setting circuit.

Next, the relationship between the components of the data communication apparatus of the first embodiment and the operation thereof will be described. In the reception unit 1, the reception signal received by the reception antenna 2 is converted into a baseband by the frequency conversion circuit 3, demodulated by the demodulation circuit 4, and the despreading circuit 5 is transmitted.
, The information is reproduced, and the reproduced reception information is output from the reception information interface circuit 6 to an external audio decoder or the like. At this time, the interference measuring circuit 7 incorporated in the receiving unit 1 searches for a carrier frequency having a low interference level and sends it to the transmitting unit 8.

In the transmission section 8, information to be transmitted from an external voice encoder or the like is connected to the transmission section 8 via the transmission information interface circuit 13, and the spreading circuit 1
It is spread by 2, modulated by the modulation circuit 11, converted to a desired carrier frequency by the frequency conversion circuit 10, and transmitted from the transmission antenna 9.

At this time, in the case of performing transmission requiring a low error rate, an instruction from the information transmission type setting circuit 14 causes
The frequency conversion circuit 1 is based on the carrier frequency with a small interference level searched for by the interference measurement circuit 7 incorporated in the receiver 1.
When 0, the transmission frequency of the data transmission channel is set to a frequency with a small number of simultaneous communication channels. Information about the transmission frequency of the data transmission channel is reported to the receiving unit that is the target of data transmission through the common control channel in which the frequency and the spreading code are fixed. The interference level may be measured and the transmission frequency may be set at any time during data transmission.

FIG. 2 is a block diagram of a data communication device according to a second embodiment of the present invention. In FIG. 2, 301 is a receiver,
302 is a receiving antenna, 303 is a time slot allocation circuit, 304 is a demodulation circuit, 305 is a despreading circuit, 30
6 is a reception information interface circuit, 307 is an interference measurement circuit, 308 is a transmission unit, 309 is a transmission antenna, 310 is a time slot allocation circuit, 311 is a modulation circuit, 31
2 is a spreading circuit, 313 is a transmission information interface circuit,
Reference numeral 314 is an information transmission type setting circuit.

Next, the relationship between the components of the data communication apparatus of the second embodiment and the operation thereof will be described. In the reception unit 301, the reception signal received by the reception antenna 302 is demodulated by the demodulation circuit 304, only the desired time slot is extracted by the time slot allocation circuit 303, despread by the despreading circuit 305, and information is reproduced. The received information thus reproduced is output from the reception information interface circuit 306 to an external audio decoder or the like.

In the transmitting unit 308, information to be transmitted from an external audio encoder or the like is connected to the transmitting unit 308 via the transmission information interface circuit 313,
The signal is spread by the spreading circuit 312, modulated by the modulating circuit 311, assigned to a desired time slot by the time slot assigning circuit 310, and transmitted from the transmitting antenna 309.

At this time, in the case of performing transmission requiring a low error rate, the interference measuring circuit 307 built in the receiving section 301 searches for a time slot having a small interference level by an instruction from the information transmission type setting circuit 314. The time slot allocation circuit 303 sets the transmission frequency of the data transmission channel to a time slot having a small number of simultaneous communication channels. The information about the time slot number of the data transmission channel is reported to the receiving unit that is the target of data transmission through the common control channel in which the frequency, the spreading code, and the time slot are fixed.

The interference level may be measured and the transmission frequency may be set at any time during data transmission.

[0017]

As described above, according to the present invention, in a data communication apparatus, it is possible to realize low error rate transmission with a small transmission power by an instruction of the interference measurement circuit and the information transmission type setting circuit. In addition, it is possible to reduce the increase in power consumption, volume, and weight of the transmitter.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a data communication device according to a first embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a data communication device according to a second embodiment of the present invention.

FIG. 3 is a schematic configuration diagram of a conventional data communication device.

[Explanation of symbols]

 1,301 Reception unit 2,302 Reception antenna 3 Frequency conversion circuit 4,304 Demodulation circuit 5,305 Despreading circuit 6,306 Reception information interface circuit 7,307 Interference measurement circuit 8,308 Transmission unit 9,309 Transmission antenna 10 Frequency Conversion circuit 11,311 Modulation circuit 12,312 Spreading circuit 13,313 Transmission information interface circuit 14,314 Information transmission type setting circuit 303,310 Time slot allocation circuit

Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display location H04J 13/00 F

Claims (2)

[Claims] 1. A CDMA system and an FDMA system in which information transmissions having different required error rates such as data transmissions and voice transmissions are mixed.
In data communication that uses both methods, the receiving unit is equipped with an interference measuring circuit that measures a carrier frequency with a small interference level from the received signal, and the transmitting unit uses a carrier set by the frequency conversion circuit when a low error rate is required. A data communication device comprising an information transmission type setting circuit for instructing to set a frequency to a frequency having a small number of simultaneous communication channels based on a carrier frequency having a low interference level measured by the interference measuring circuit. 2. A CDMA system and a TDMA in which information transmissions having different required error rates such as data transmissions and voice transmissions are mixed.
In data communication that uses both methods, the receiving unit is equipped with an interference measuring circuit that measures a carrier frequency with a small interference level from the received signal, and the transmitting unit uses a carrier set by the frequency conversion circuit when a low error rate is required. When a low error rate is required, including an information transmission type setting circuit for instructing to set a frequency to a frequency with a small number of simultaneous communication channels based on a carrier frequency with a low interference level measured by the interference measuring circuit And a data communication device having a function of setting a time slot number set by the time slot allocation circuit to a time slot having a small number of simultaneous communication channels, in accordance with an instruction from the interference measurement circuit and the information transmission type setting circuit.