Communication apparatus

• US 20060045177A1
• Filed: 08/22/2005
• Published: 03/02/2006
• Est. Priority Date: 08/24/2004
• Status: Active Grant

• Current Assignee: Fujitsu Component Limited (Fujitsu Limited)
• Original Assignee: Fujitsu Component Limited (Fujitsu Limited)
• Inventors: Kurashima, Shigemi, Yanagi, Masahiro, Iwata, Hideki, Arita, Takashi, Inoue, Hiroto, Uchiyama, Takuya
• Granted Patent: US 8,451,888 B2
• Time in Patent Office: Days
• US Class Current: 375/239
• CPC Class Codes: H03K 7/04 Position modulation, i.e. PPM
• CPC Class Codes: H03K 9/04 of position-modulated pulses

Abstract

An impulse communication apparatus includes an impulse train generating part generating an impulse train from one modulated pulse by on-off keying, and an impulse train sending part sending the impulse train generated by the impulse train generating part.

Claims

1. An impulse communication apparatus comprising:

an impulse train generating part generating an impulse train from one modulated pulse by on-off keying; and

an impulse train sending part sending the impulse train generated by the impulse train generating part.

2. The impulse communication apparatus as claimed in claim 1, wherein the impulse train generating part comprises:

a first part that generates a pulse;

a second part that performs an AND operation on the modulated pulse and the pulse generated by the first part to generate another pulse; and

a third part generating the impulse train at a timing defined by said another pulse.

3. The impulse communication apparatus as claimed in claim 2, wherein the third part comprises a step recovery diode.

4. The impulse communication apparatus as claimed in claim 1, wherein the modulated pulse is based on pulse position modulation.

5. The impulse communication apparatus as claimed in claim 1, wherein the impulse train generating part selects a period of the impulse train based on a communication channel used.

6. The impulse communication apparatus as claimed in claim 1, wherein the impulse train generating part selects a pulse width of the impulse train based on a communication channel used.

7. The impulse communication apparatus as claimed in claim 1, wherein the impulse train generating part selects a period of the impulse train at random.

8. The impulse communication apparatus as claimed in claim 1, further comprising a delay circuit that delays the modulated pulse by multiple delay times to thus generate a train of pulses, wherein the impulse train generating part performs the on-off keying for the train of pulses from the delay circuit and generates the impulse train.

9. The impulse communication apparatus as claimed in claim 8, wherein the delay circuit includes delay elements associated with the multiple delay times.

10. The impulse communication apparatus as claimed in claim 8, wherein the multiple delay times have a relationship of monotonous increase or decrease.

11. The impulse communication apparatus as claimed in claim 8, wherein the differences among the delay times are at random.

12. An impulse communication apparatus comprising:

an impulse train receiving part that receives an impulse train obtained by performing an on/off keying for one modulated pulse; and

an impulse train detector part that detects the impulse train received by the impulse train receiving part.

13. The impulse communication apparatus as claimed in claim 12, further comprising a part that identifies a communication channel by referring to the impulse train received by the impulse train receiving part.

14. The impulse communication apparatus as claimed in claim 12, further comprising a part that identifies a communication channel on the basis of a period of the impulse train received by the impulse train receiving part.

15. The impulse communication apparatus as claimed in claim 12, further comprising a part that identifies a communication channel on the basis of the number of impulses of the impulse train.

16. The impulse communication apparatus as claimed in claim 12, wherein:

the impulse train receiving part receives the impulse train obtained by the on-off keying for a train of pulses generated by delaying the modulated pulse by first multiple delay times;

the impulse train receiving part comprises a delay/combine part that delays the impulse train by second multiple delay times and combines delayed impulse trains; and

the detector part detects a combined impulse train from the delay/combine part.

17. The impulse communication apparatus as claimed in claim 16, wherein the second multiple delay times includes a maximum delay time among the first multiple delay times, and delay times obtained by subtracting each of remaining delay times included in the first multiple delay times from the maximum delay time.

18. The impulse communication apparatus as claimed in claim 12, wherein the detector part includes a low-pass filter filtering the impulse train, and a peak detecting part that detects a peak of an output signal of the low-pass filter.

19. The impulse communication apparatus as claimed in claim 18, wherein the low-pass filter has a cutoff frequency equal to a reciprocal number among the first multiple delay times.