TRANSMISSION APPARATUS, RECEPTION APPARATUS AND DIGITAL RADIO COMMUNICATION METHOD

• US 20080095270A1
• Filed: 12/13/2007
• Published: 04/24/2008
• Est. Priority Date: 07/28/1999
• Status: Active Grant

• Current Assignee: Redwood Technologies, LLC (Dominion Harbor Enterprises, LLC)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: TAKABAYASHI, Shinichiro, ORIHASHI, Masayuki, MATSUOKA, Akihiko, MURAKAMI, Yutaka
• Granted Patent: US 7,545,882 B2
• Time in Patent Office: Days
• US Class Current: 375/308
• CPC Class Codes: H04B 1/38 Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0006 by adapting the transmission format
• CPC Class Codes: H04L 27/12 Modulator circuits; Transmitter circuits
• CPC Class Codes: H04L 27/206 using a pair of orthogonal carriers, e.g. quadrature carriers
• CPC Class Codes: H04L 27/34 Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
• CPC Class Codes: H04L 27/3455 in order to facilitate carrier recovery at the receiver end, e.g. by transmitting a pilot or by using additional signal points to allow the detection of rotations

Abstract

A transmission apparatus includes a frame configuration determiner that determines a modulation system, from among a plurality of modulation systems, based on a communication situation. A first symbol generator modulates a digital transmission signal, according to the modulation system determined by the frame configuration determiner and generates a first symbol, the first symbol comprising a first quadrature baseband signal. A second symbol generator modulates a known digital transmission signal between a transmitting side and a receiving side and generates a second symbol, the second symbol comprising a second quadrature baseband signal.

Claims

1. A transmission apparatus comprising:

a frame configuration determiner that determines a modulation system, from among a plurality of modulation systems, based on a communication situation;

a first symbol generator that modulates a digital transmission signal according to the modulation system determined by the frame configuration determiner and that generates a first symbol, the first symbol comprising a first quadrature baseband signal; and

a second symbol generator that modulates a known digital transmission signal between a transmitting side and a receiving side and that generates a second symbol, the second symbol comprising a second quadrature baseband signal.

2. The transmission apparatus according to claim 1, wherein the second symbol generator generates the second symbol by BPSK modulation.

3. The transmission apparatus according to claim 1, wherein the frame configuration determiner determines an insertion interval of the second symbol based on the communication situation.

4. The transmission apparatus according to claim 1, wherein the frame configuration determines initially determines the communication situation based on at least one of transmission path information and data transmission speed information.

5. The transmission apparatus according to claim 1, wherein the frame configuration determines initially determines the communication situation based on at least a quality of a received signal.

6. A digital radio communication method comprising:

determining a modulation system, from among a plurality of modulation systems, based on a communication situation;

modulating a digital transmission signal according to the determined modulation system and generating a first symbol, the first symbol comprising a first quadrature baseband signal; and

modulating a known digital transmission signal between a transmitting side and a receiving side and generating a second symbol comprising a second quadrature baseband signal.

7. The digital radio communication method according to claim 6, the second symbol being generated by BPSK modulation.

8. The digital radio communication method according to claim 6, further comprising determining an insertion interval of the second symbol based on the communication situation.

9. The digital radio communication method according to claim 6, further comprising determining the communication situation based on at least one of transmission path information and data transmission speed information.

10. The digital radio communication method according to claim 6, further comprising determining the communication situation based on at least a quality of a received signal.