Transmission apparatus, reception apparatus and digital radio communication method

• US 9,106,486 B2
• Filed: 09/13/2012
• Issued: 08/11/2015
• Est. Priority Date: 07/28/1999
• Status: Expired due to Fees

• Current Assignee: Redwood Technologies, LLC (Dominion Harbor Enterprises, LLC)
• Original Assignee: Wi-Fi One, LLC (Inception Holdings, LLC)
• Inventors: Murakami, Yutaka, Takabayashi, Shinichiro, Orihashi, Masayuki, Matsuoka, Akihiko
• Primary Examiner(s): Jain, Ankur
• Application Number:
  US13/613,407
• Publication Number:
  US 20130003887A1
• Time in Patent Office: 1,062 Days
• Field of Search: 375/285
• US Class Current: 1/1
• 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 method includes generating first symbols for transmitting data, a signal point of each of the first symbols on an in-phase and quadrature-phase plane comprising an in-phase component and a quadrature-phase component and generating a second symbol, the second symbol being a pilot symbol. The method further includes selecting an insertion pattern of the second symbol, from a plurality of predetermined insertion patterns, inserting the second symbol in the first symbols based on the selected insertion pattern to generate a transmission signal, and transmitting the transmission signal. The first symbols are generated using a modulation scheme selected from a plurality of modulation schemes.

Claims

1. A transmission method comprising:

generating first symbols for transmitting data, a signal point of each of the first symbols on an in-phase and quadrature-phase plane comprising an in-phase component and a quadrature-phase component, a first symbol being a quadrature baseband signal;

generating a second symbol, the second symbol being a pilot symbol and a second quadrature baseband signal;

determining an interval of symbol insertion, outputting a signal indicating the determined interval, and selecting an insertion pattern of the second symbol, from a plurality of predetermined insertion patterns;

inserting the second symbol in the first symbols based on the selected insertion pattern to generate a transmission signal; and

transmitting the transmission signal,

wherein the first symbols are generated using a modulation scheme selected from a plurality of modulation schemes.

2. The transmission method according to claim 1, wherein the insertion pattern comprises an insertion interval of the second symbol in the first symbols.

3. The transmission method according to claim 1, wherein the modulation scheme used to generate the first symbol is selected from the plurality of modulation schemes based on a communication situation between a transmission apparatus and a reception apparatus.

4. The transmission method according to claim 2, wherein the insertion interval of the second symbol in the first symbols can be changed based on a communication situation between the transmission apparatus and the reception apparatus.

5. The transmission method according to claim 3, wherein the communication situation comprises transmission path information and reception signal level information.

6. A reception method that receives the transmission signal transmitted using the transmission method according to claim 1, the reception method comprising:

receiving the transmission signal;

estimating an amount of transmission path distortion of the received transmission signal; and

outputting the estimated amount of transmission path distortion.

7. A transmission apparatus configured to:

generate first symbols for transmitting data, a signal point of each of the first symbols on an in-phase and quadrature-phase plane comprising an in-phase component and a quadrature-phase component, a first symbol being a quadrature baseband signal;

generate a second symbol, the second symbol being a pilot symbol and a second quadrature baseband signal;

determine an interval of symbol insertion, output a signal indicating the determined interval, and select an insertion pattern of the second symbol, from a plurality of predetermined insertion patterns;

insert the second symbol in the first symbols, based on the selected insertion pattern, to generate a transmission signal; and

transmit the transmission signal,

wherein the first symbols are generated using a modulation scheme selected from a plurality of modulation schemes.

8. The transmission apparatus according to claim 7, wherein the insertion pattern comprises an insertion interval of the second symbol in the first symbols.

9. The transmission apparatus according to claim 7, wherein the modulation scheme used to generate the first symbol is selected from the plurality of modulation schemes based on a communication situation between the transmission apparatus and a reception apparatus.

10. The transmission apparatus according to claim 8, wherein the insertion interval of the second symbol in the first symbols can be changed based on a communication situation between the transmission apparatus and the reception apparatus.

11. The transmission apparatus according to claim 9, wherein the communication situation comprises transmission path information and reception signal level information.

12. A reception apparatus that receives the transmission signal transmitted from the transmission apparatus according to claim 7, the reception apparatus comprising:

a receiver that receives the transmission signal; and

an estimator that estimates an amount of transmission path distortion of the received transmission signal and outputs the estimated amount of transmission path distortion.