Communication apparatus

• US 4,958,359 A
• Filed: 06/07/1988
• Issued: 09/18/1990
• Est. Priority Date: 06/09/1987
• Status: Expired due to Term

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Kato, Ichiro
• Primary Examiner(s): CANGIALOSI, SALVATORE A
• Application Number:
  US07/203,084
• Time in Patent Office: 833 Days
• Field of Search: 375/1, 380/34
• US Class Current: 375/141
• CPC Class Codes: H04B 1/707 using direct sequence modulation

Abstract

A spread communication system comprising a receiver, a diffusion convertor for converting a signal from the receiver, a control signal generator for generating a control signal representing an output level of the diffusion convertor, another diffusion converter for converting data to be transmitted, a transmitter for transmitting data from the another diffusion convertor and a transmission controller for controlling a transmission level of the transmitter in accordance with the control signal from the control signal generator.

Claims

1. A spectrum diffusion communication apparatus comprising:

receiving means for receiving a signal;

receiving conversion means for converting the signal received by said receiving means in accordance with a first diffusion code, said first diffusion code being determined on the basis of a diffusion code used in transmission by a partner station;

control signal generating means for generating a control signal corresponding to a level of the output of said receiving conversion means;

transmission conversion means for converting data to be transmitted in accordance with a second diffusion code;

transmission means for transmitting the output of said transmission conversion means to the partner station; and

transmission control means for controlling a transmission level of said transmission means in accordance with the control signal generated by said control signal generating means.

2. A spectrum diffusion communication apparatus according to claim 1, wherein said receiving means receives a radio signal.

3. A spectrum diffusion communication apparatus according to claim 1, wherein said transmission means transmits a radio signal.

4. A spectrum diffusion communication apparatus according to claim 1, wherein said transmission control means controls the transmission level of said transmission means such that the transmission level of said transmission means is inversely proportional to the output level of said receiving means.

5. A spectrum diffusion communication apparatus according to claim 1 further comprising:

demodulation means for demodulating source data from the output of said receiving conversion means; and

demodulation control means for controlling an output level of said demodulation means in accordance with the control signal generated by said control signal generation means.

6. A spectrum diffusion communication apparatus according to claim 1 further comprising:

amplifier means for amplifying the output of said receiving conversion means; and

amplification control means for controlling an amplification factor of said amplifier means in accordance with the control signal generated by said control means.

7. A spectrum diffusion communication apparatus according to claim 5, wherein said demodulation control means controls said demodulation means to keep the output level thereof constant.

8. A spectrum diffusion communication apparatus according to claim 6, wherein said amplification control means controls the amplification factor of said amplifier means to keep the output level thereof constant.

9. A spectrum diffusion communication apparatus comprising:

receiving means for receiving a signal;

first conversion means for converting the signal received by said receiving means in accordance with a first diffusion code, said first diffusion code being determined on the basis of a diffusion code used in transmission by a partner station;

control signal generating means for generating a control signal corresponding to an output level of said first conversion means;

second conversion means for converting the signal received by said receiving means in accordance with a second diffusion code, said second diffusion code being determined on the basis of another diffusion code used in transmission by the partner station;

demodulation means for demodulating source data from the output of said second conversion means;

third conversion means for correlating data to be transmitted to a third diffusion code;

transmission means for transmitting the output of said third conversion means to the partner station; and

transmission control means for controlling a transmission level of said transmission means in accordance with the control signal generated by said control signal generating means.

10. A spectrum diffusion communication apparatus according to claim 9, wherein said receiving means receives a radio signal.

11. A spectrum diffusion communication apparatus according to claim 9, wherein said transmission means transmits a radio signal.

12. A spectrum diffusion communication apparatus according to claim 9 wherein said transmission control means controls the transmission level of said transmission means such that the transmission level of said transmission means is inversely proportional to the output level of said receiving means.

13. A spectrum diffusion communication apparatus according to claim 9 further comprising:

demodulation control means for controlling an output level of said demodulation means in accordance with the control signal generated by said control signal generating means.

14. A spectrum diffusion communication apparatus according to claim 13, wherein said demodulation control means controls said demodulation means to keep the output level thereof constant.

15. A spectrum diffusion communication apparatus according to claim 9, wherein the first diffusion code is a diffusion code used, in transmission of level control signal, by said partner station, and the second diffusion code is a diffusion code used for data transmission by said partner station.