Transmission apparatus, reception apparatus and digital radio communication method

• US 8,295,399 B2
• Filed: 09/08/2008
• Issued: 10/23/2012
• Est. Priority Date: 07/28/1999
• Status: Expired due to Term

• Current Assignee: Redwood Technologies, LLC (Dominion Harbor Enterprises, LLC)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Matsuoka, Akihiko, Orihashi, Masayuki, Takabayashi, Shinichiro, Murakami, Yutaka
• Primary Examiner(s): Nguyen, Duc
• Assistant Examiner(s): Jain, Ankur
• Application Number:
  US12/206,427
• Publication Number:
  US 20090011699A1
• Time in Patent Office: 1,506 Days
• Field of Search: 375/298
• US Class Current: 375/298
• 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 digital radio communication method includes selecting a modulation scheme for a transmission data signal from among a plurality of modulation schemes. The transmission data signal is modulated according to the selected modulation scheme to generate a first symbol, the first symbol being a first quadrature baseband signal. Further, a pilot signal is modulated according to a specific modulation scheme to generate a second symbol, the second symbol being a second quadrature baseband signal.

Claims

1. A digital radio communication method comprising:

selecting a modulation scheme for a transmission data signal from among a plurality of modulation schemes;

determining an interval of symbol insertion based on a communication situation and outputting a signal indicating the determined interval of symbol insertion;

modulating the transmission data signal according to the selected modulation scheme to generate a first symbol, the first symbol being a first quadrature baseband signal, based on the signal indicating the determined interval of symbol insertion; and

modulating a pilot signal according to a specific modulation scheme to generate a second symbol, the second symbol being a second quadrature baseband signal, based on the signal indicating the determined interval of symbol insertion;

wherein the second symbol being a symbol arranged on a virtual line that links an origin and a signal point of the first symbol, on a signal space diagram.

2. The digital radio communication method according to claim 1,

wherein the selecting of the modulation scheme is based on channel quality information between a transmission apparatus and a reception apparatus.

3. The digital radio communication method according to claim 2,

wherein the channel quality information comprises feedback information from the reception apparatus.

4. The digital radio communication method according to claim 3,

wherein the feedback information includes at least one of transmission path information and received signal strength information.

5. The digital radio communication method according to claim 1,

wherein the specific modulation scheme for the pilot signal comprises BPSK modulation.

6. A transmission apparatus comprising:

a frame configuration determiner that determines a modulation scheme for a transmission data signal from among a plurality of modulation schemes;

wherein the frame configuration determiner further determines an interval of symbol insertion based on a communication situation and outputs a signal indicating the determined interval of symbol insertion;

a first modulator that modulates the transmission data signal in accordance with the selected modulation scheme to generate a first symbol, said first symbol being a first quadrature baseband signal based on the signal indicating the determined interval of symbol insertion; and

a second modulator that modulates a pilot signal in accordance with a specific modulation scheme to generate a second symbol, said second symbol being a second quadrature baseband signal, based on the signal indicating the determined interval of symbol insertion;

wherein the second symbol being a symbol arranged on a virtual line that links an origin and a signal point of the first symbol, on a signal space diagram.

7. The transmission apparatus according to claim 6,

wherein said frame configuration determiner determines the modulation scheme based on channel quality information between the transmission apparatus and a reception apparatus.

8. The transmission apparatus according to claim 7,

wherein the channel quality information comprises feedback information from the reception apparatus.

9. The transmission apparatus according to claim 8,

wherein the feedback information includes at least one of transmission path information and received signal strength information.

10. The transmission apparatus according to claim 6,

wherein the specific modulation scheme for the pilot signal comprises BPSK modulation.