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

• US 7,164,722 B2
• Filed: 08/09/2002
• Issued: 01/16/2007
• Est. Priority Date: 08/17/2001
• Status: Expired due to Fees

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Takamura, Kazuhisa
• Primary Examiner(s): Bocure; Tesfaldet
• Assistant Examiner(s): PANWALKAR, VINEETA S
• Application Number:
  US10/216,528
• Publication Number:
  US 20030035465A1
• Time in Patent Office: 1,621 Days
• Field of Search: 375/130, 375140-142, 375/147, 375/146, 375/150, 375/238, 375/239, 375/353, 375/316, 375/259, 375/340, 375/343, 332/112, 332/115, 370/212, 370/213, 329315-317, 329/313, 329/347, 341/178
• US Class Current: 375/259
• 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, in which a transmitter communicates information using signals that are repeated over predetermined periods. A pulse generator generates pulses having a predetermined repetition period based on an information bit to be communicated, and the pulses generated by the pulse generator are transmitted. A pulse amplitude altering unit controls the amplitude of the pulses to be transmitted 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 spreading an information bit to be transmitted, for generating an amplitude-controlled impulse signal sequence by controlling respective amplitudes of impulses of said impulse signal sequence in accordance with a predefined pattern, and for transmitting said amplitude-controlled impulse signal sequence; and

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

each of the impulses of said impulse signal sequence has a pulse width of approximately 1 nanosecond or less such that an occupied bandwidth is on the order of approximately 1 gigahertz or more, and

the amplitude-controlled impulse signal sequence comprises a first plurality of impulses having a first amplitude and a second plurality of impulses having a second amplitude different from the first amplitude, in which at least one of the impulses included in the first plurality of impulses is separated from another impulse included in the first plurality of impulses by at least one impulse included in the second plurality of impulses.

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 spreading an information bit to be transmitted, for generating an amplitude-controlled impulse signal sequence by controlling respective amplitudes of impulses of said impulse signal sequence in accordance with a predefined pattern, and for 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 transmitted by said transmitter, for generating an information value from said correlated output signal, and for weighting said information value in accordance with said predefined pattern,

each of the impulses of said impulse signal sequence has a pulse width of approximately 1 nanosecond or less such that an occupied bandwidth is on the order of approximately 1 gigahertz or more, and

the amplitude-controlled impulse signal sequence comprises a first plurality of impulses having a first amplitude and a second plurality of impulses having a second amplitude different from the first amplitude, in which at least one of the impulses included in the first plurality of impulses is separated from another impulse included in the first plurality of impulses by at least one impulse included in the second plurality of impulses.

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 respective amplitudes of said impulses of said impulse signal sequence generated by said impulse signal sequence generating means accordance with a predefined pattern; and

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

each of the impulses of said impulse signal sequence has a pulse width of approximately 1 nanosecond or less such that an occupied bandwidth is on the order of approximately 1 gigahertz or more, and

the amplitude controlled impulse signal sequence comprises a first plurality of impulses having a first amplitude and a second plurality of impulses having a second amplitude different from the first amplitude, in which at least one of the impulses included in the first plurality of impulses is separated from another impulse included in the first plurality of impulses by at least one impulse included in the second plurality of impulses.

4. The transmitter according to claim 3, wherein said control means controls the amplitudes of each of said impulses from said impulse signal sequence generating means.

5. The transmitter according to claim 3, wherein said control means controls the amplitudes of said impulses in groups formed of a plurality of said impulses from said impulse signal sequence generating means.

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 respective amplitudes of said impulses altered in accordance with a predefined pattern for obtaining a correlated output signal by correlating 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,

each of the impulses of said impulse signal sequence has a pulse width of approximately 1 nanosecond or less such that an occupied bandwidth is on the order of approximately 1 gigahertz or more, and

the impulse signal sequence comprises a first plurality of impulses having a first amplitude and a second plurality of impulses having a second amplitude different from the first amplitude, in which at least one of the impulses included in the first plurality of impulses is separated from another impulse included in the first plurality of impulses by at least one impulse included in the second plurality of impulses.

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

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 received 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 said predefined pattern,

each of the impulses of said impulse signal sequence has a pulse width of approximately 1 nanosecond or less such that an occupied bandwidth is on the order of approximately 1 gigahertz or more, and

the impulse signal sequence comprises a first plurality of impulses having a first amplitude and a second plurality of impulses having a second amplitude different from the first amplitude, in which at least one of the impulses included in the first plurality of impulses is separated from another impulse included in the first plurality of impulses by at least one impulse included in the second plurality of impulses.

9. The receiver according to claim 8, wherein said control means controls said weighting operation in groups of a plurality of said 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 respective amplitudes of said impulses of said generated impulse signal sequence in accordance with a predetermined pattern,

each of the impulses of said impulse signal sequence has a pulse width of approximately 1 nanosecond or less such that an occupied bandwidth is on the order of approximately 1 gigahertz or more, and

the amplitude controlled impulse signal sequence comprises a first plurality of impulses having a first amplitude and a second plurality of impulses having a second amplitude different from the first amplitude, in which at least one of the impulses included in the first plurality of impulses is separated from another impulse included in the first plurality of impulses by at least one impulse included in the second plurality of impulses.

11. The radio transmission method according to claim 10, wherein said step of controlling an respective amplitudes of said impulses is performed for each impulse.

12. The radio transmission method according to claim 10, wherein said step of controlling an respective amplitudes of said impulses is performed in groups formed of a plurality said 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 respective amplitudes 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 in said step of amplifying based on said predefined pattern,

each of the impulses of said impulse signal sequence has a pulse width of approximately 1 nanosecond or less such that an occupied bandwidth is on the order of approximately 1 gigahertz or more, and

the impulse signal sequence comprises a first plurality of impulses having a first amplitude and a second plurality of impulses having a second amplitude different from the first amplitude, in which at least one of the impulses included in the first plurality of impulses is separated from another impulse included in the first plurality of impulses by at least one impulse included in the second plurality of impulses.

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

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 respective amplitudes of said impulses controlled according to a predefined pattern;

generating a correlated output signal by correlating said radio signal and a spread signal;

obtaining an information value from said correlated output signal;

weighting said information value; and

controlling said step of weighting based on said predefined pattern,

each of the impulses of said impulse signal sequence has a pulse width of approximately 1 nanosecond or less such that an occupied bandwidth is on the order of approximately 1 gigahertz or more, and

the impulse signal sequence comprises a first plurality of impulses having a first amplitude and a second plurality of impulses having a second amplitude different from the first amplitude, in which at least one of the impulses included in the first plurality of impulses is separated from another impulse included in the first plurality of impulses by at least one impulse included in the second plurality of impulses.

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