COMMUNICATION APPARATUS

• US 20130034131A1
• Filed: 07/27/2012
• Published: 02/07/2013
• Est. Priority Date: 08/01/2011
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: NAKASHA, Yasuhiro, HAYASHI, Hiroki, ITOH, Takumi
• Granted Patent: US 9,184,789 B2
• Time in Patent Office: Days
• US Class Current: 375/219
• CPC Class Codes: H04B 1/7174 Pulse generation in general H04L25/03834
• CPC Class Codes: H04B 1/719 Interference-related aspects
• CPC Class Codes: H04B 10/25137 using pulse shaping at the transmitter, e.g. pre-chirping or dispersion supported transmission [DST]
• CPC Class Codes: H04L 25/03834 using pulse shaping
• CPC Class Codes: H04L 25/4904 using self-synchronising codes, e.g. split-phase codes
• CPC Class Codes: H04L 25/4915 using pattern inversion or substitution H04L25/4908 takes precedence

Abstract

a communication apparatus includes: a pulse generation unit configured to alternately generate a positive pulse and a negative pulse indicating presence or absence of a pulse in accordance with a value of a data signal; a band-pass filter configured to filter the pulse generated by the pulse generator; and a transmission amplifier configured to amplify a signal filtered by the band-pass filter, and to output the signal as a transmission signal.

Claims

1. A communication apparatus comprising:

a pulse generation unit configured to alternately generate a positive pulse and a negative pulse indicating presence or absence of a pulse in accordance with a value of a data signal;

a band-pass filter configured to filter the pulse generated by the pulse generator; and

a transmission amplifier configured to amplify a signal filtered by the band-pass filter, and to output the signal as a transmission signal.

2. The communication apparatus according to claim 1,

wherein the pulse generation unit includes a nonreturn-to-zero/return-to-zero conversion unit configured to convert the data signal from a nonreturn-to-zero signal to a return-to-zero signal.

3. The communication apparatus according to claim 1,

wherein the pulse generation unit includes a pulse generator configured to shorten a pulse width of a return-to-zero signal, and to alternately generate the positive pulse and the negative pulse.

4. The communication apparatus according to claim 3,

wherein the pulse generation unit includes a trigger flip-flop configured to invert an output signal for each one cycle of the return-to-zero signal, and

the pulse generator receives the output signal of the trigger flip-flop and the return-to-zero signal.

5. The communication apparatus according to claim 1

wherein the pulse generation unit includes

a nonreturn-to-zero/return-to-zero conversion unit configured to convert the data signal from a nonreturn-to-zero signal to a return-to-zero signal, and

a pulse generator configured to shorten a pulse width of the return-to-zero signal, and to alternately generate the positive pulse and the negative pulse.

6. The communication apparatus according to claim 5,

wherein the pulse generation unit includes a trigger flip-flop configured to invert an output signal for each one cycle of the return-to-zero signal, and

the pulse generator receives the output signal of the trigger flip-flop and the return-to-zero signal.

7. The communication apparatus according to claim 1,

wherein a transmission speed of the data signal is one of integer divisions of a difference between an upper-limit pass frequency and a lower-limit pass frequency of the band-pass filter.

8. The communication apparatus according to claim 1, further comprising

a first antenna for radio-transmitting the transmission signal amplified by the transmission amplifier.

9. The communication apparatus according to claim 1, further comprising

a reception amplifier configured to amplify a reception signal, and

a wave detector configured to detect the reception signal amplified by the reception amplifier.

10. The communication apparatus according to claim 9, further comprising

a second antenna for radio receiving the reception signal,

wherein the reception amplifier amplifies the reception signal radio-received by the second antenna.