Radio communications system, transmitter, receiver, radio transmission method, radio reception method and computer program therefor

• US 20030035465A1
• Filed: 08/09/2002
• Published: 02/20/2003
• Est. Priority Date: 08/17/2001
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Takamura, Kazuhisa
• Granted Patent: US 7,164,722 B2
• Time in Patent Office: Days
• US Class Current: 375/141
• CPC Class Codes: H04B 1/7172 Pulse shape in general H04L25/03834
• CPC Class Codes: H04B 1/719 Interference-related aspects

Abstract

A radio communications system in which a desired signal can be accurately discriminated from interfering signals, even when signals from a plurality of transmitters are received simultaneously, is provided. A transmitter for this system communicates information using signals which are repeated over predetermined periods. A pulse generator generates pulses having a predetermined repetition period based on an information bit to be communicated. Transmission means transmit the pulses generated by the pulse generator. Pulse amplitude alterating means control the amplitude of the pulses to be transmitted by the transmitting means in accordance with a predefined pattern under the control of a control unit.

Claims

1. A radio communications system for communicating information using an impulse signal sequence including impulses having a predetermined impulse period, comprising:

a transmitter for generating said impulse signal sequence using a spread signal obtained by having an information bit to be transmitted spread, generating an amplitude controlled impulse signal sequence by controlling the amplitude of said impulses of said impulse signal sequence in accordance with a predefined pattern, and transmitting said amplitude-controlled impulse signal sequence; and

a receiver for generating a correlated output signal from said amplitude-controlled impulse signal sequence, and controlling the amplitude of said correlated output signal in accordance with said predefined pattern.

2. A radio communications system for communicating information using an impulse signal sequence including impulses having a predetermined impulse period, comprising:

a transmitter for generating said impulse signal sequence using a spread signal obtained by having an information bit to be transmitted spread, generating an amplitude controlled impulse signal sequence by controlling the amplitude of said impulses of said impulse signal sequence in accordance with a predefined pattern, and transmitting said amplitude-controlled impulse signal sequence; and

a receiver for generating a correlated output signal from a received radio signal including said amplitude-controlled impulse signal sequence, generating an information value from said correlated output signal, and weighting said information value in accordance with said predefined pattern.

3. A transmitter of a radio communications system for communicating information using an impulse signal sequence including impulses having a predetermined impulse period, comprising:

impulse signal sequence generating means for generating said impulse signal sequence based on a spread signal obtained by spreading an information bit to be transmitted using a spreading code;

control means for controlling the amplitude of said impulses of said impulse signal sequence generated by said impulse signal sequence generating means; and

transmitting means for receiving said impulse signal sequence having impulses with controlled amplitudes from said impulse signal sequence generating means, and transmitting said impulse signal sequence.

4. The transmitter according to claim 3, wherein said control means controls the amplitudes of each of said impulse.

5. The transmitter according to claim 3, wherein said control means controls the amplitudes of said impulses in groups of a plurality of impulses.

6. A receiver of a radio communications system for communicating information using an impulse signal sequence including impulses having a predetermined impulse period, comprising:

radio reception means for receiving a radio signal including said impulse signal sequence having an amplitude of said impulses thereof altered in accordance with a predefined pattern, and obtaining a correlated output signal of said radio signal and a spreading code;

amplifying means for amplifying said correlated output signal; and

control means for controlling an amplifying operation of said amplifying means based on said predefined pattern.

7. The receiver according to claim 6, wherein said control means controls the amplifying operation of said amplifying means for each impulse.

8. A receiver of a radio communications system for communicating information using an impulse signal sequence including impulses having a predetermined impulse period, comprising:

radio reception means for generating a correlated output signal of a spreading code and a radio signal including said impulse signal sequence having an amplitude of said impulses thereof altered based on a predefined pattern;

a weighting processing section for weighting an information value generated from said correlated output signal; and

control means for controlling a weighting operation of said weighting processing section based on a pattern corresponding to said predefined pattern.

9. The receiver according to claim 8, wherein said control means controls said weighting operation in groups of a plurality of impulses.

10. A radio transmission method for communicating information using an impulse signal sequence including impulses having a predetermined impulse period, comprising the steps of:

generating said impulse signal sequence based on an information bit to be transmitted; and

controlling the amplitude of said impulses of said generated impulse signal sequence in accordance with a predetermined pattern.

11. The radio transmission method according to claim 10, wherein said controlling of the amplitude of said impulses is performed for each impulse.

12. The radio transmission method according to claim 10, wherein said controlling of the amplitude of said impulses is performed in groups of a plurality impulses.

13. A radio reception method for communicating information using an impulse signal sequence including impulses having a predetermined impulse period, comprising the steps of:

receiving a radio signal including said impulse signal sequence having the amplitude of said impulses altered in accordance with a predefined pattern;

generating a correlated output signal of said radio signal and a spread signal;

amplifying said correlated output signal; and

controlling an amplification factor based on said predefined pattern.

14. The radio reception method according to claim 13, wherein said controlling of said amplification factor is performed for each impulse.

15. A radio reception method for communicating information using an impulse signal sequence including impulses having a predetermined impulse period, comprising the steps of:

receiving a radio signal including said impulse signal sequence having the amplitude of said impulses controlled according to a predefined pattern;

generating a correlated output signal of said radio signal and a spread signal;

obtaining an information value from said correlated output signal;

weighting said information value; and

controlling said weighting based on a pattern corresponding to said predefined pattern.

16. The radio reception method according to claim 15, wherein said controlling of said weighting is performed in groups of a plurality of impulses.

17. A program for making a processing unit function as control means for controlling amplification of impulses of an impulse signal sequence in accordance with a predefined pattern, comprising the steps of:

reading out data indicating said predefined pattern;

generating information indicating an amplification factor based on said data; and

providing said information indicating said amplification factor.

18. A program for making a processing unit function as control means for controlling amplification of a correlated output signal of a spread signal and a radio signal including an impulse signal sequence having the amplitude of impulses thereof controlled in accordance with a predefined pattern, comprising the steps of:

reading out data indicating said predefined pattern;

generating information indicating an amplification factor based on said data; and

providing said information indicating said amplification factor.

19. A program for making a processing unit function as control means for controlling weighting of an information value generated from a correlated output signal of a spread signal and a radio signal including an impulse signal sequence having the amplitude of impulses thereof controlled in accordance with a predefined pattern, comprising the steps of:

reading out data indicating said predefined pattern;

generating a weighting value based on said data; and

providing said weighting value.