Very High Data Rate Communications System

• US 20080279307A1
• Filed: 05/07/2008
• Published: 11/13/2008
• Est. Priority Date: 05/07/2007
• Status: Abandoned Application

• Current Assignee: DecaWave Limited (Qorvo, Inc.)
• Original Assignee: DecaWave Limited (Qorvo, Inc.)
• Inventors: McLaughlin, Michael, Gaffney, Brian
• Application Number:
  US12/116,379
• Publication Number:
  US 20080279307A1
• Time in Patent Office: Days
• US Class Current: 375/298
• CPC Class Codes: H04L 27/3416 in which the information is carried by both the individual signal points and the subset to which the individual points belong, e.g. using coset coding, lattice coding, or related schemes

Abstract

A method of communicating data in which the data is transmitted using a star 8-Quadrature Amplitude Modulation scheme. In one embodiment of the invention, the data is encoded with a systematic trellis code in which the systematic bit corresponds to the amplitude of the transmitted signal. In another embodiment of the invention, the data is encoded using a Reed-Solomon coding without convolutional coding nor trellis coding.

Claims

1. A method of communicating data in which the data is transmitted using a star 8-Quadrature Amplitude Modulation scheme, the data being encoded with a systematic trellis code in which the systematic bit corresponds to the amplitude of the transmitted signal.

2. A method of communicating data as claimed in claim 1, wherein the data is transmitted with a π

/2 star 8-Quadrature Amplitude Modulation scheme which uses a two-level amplitude modulation combined with Quadrature Phase Shift Keying modulation to represent 3 bits per symbol.

3. A method of communicating data as claimed in claim 1, wherein the data is modulated in accordance with a constellation diagram as shown in FIG. 3, or a geometrical inversion or rotation of both rings thereof together.

4. A method of communicating data as claimed in claim 1, wherein the trellis code is a rate one over three code and has a constraint length of 5 and a minimum squared euclidean distance greater than 50 for a full code and/or greater than 7 for a punctured code.

5. A method of communicating data as claimed in claim 1, wherein the trellis code is a rate one over three code and has a constraint length of 5 and a generator polynomial g1=20₈, g2=13₈, g3=06₈ or g1=20₈, g2=27₈, g3=32₈, where g1 is the systematic bit and g2 and g3 are the other code bits.

6. A method of communicating data as claimed in claim 1, wherein the trellis code is a rate one over three code and has a constraint length of 4 and a minimum squared euclidean distance greater than 42 for a full code and/or greater than 7 for a punctured code.

7. A method of communicating data as claimed in claim 1, wherein the trellis code is a rate one over three code and has a constraint length of 4 and a generator polynomial g1=10₈, g2=17₈, g3=14₈ or g1=10₈, g2=11₈, g3=16₈ where g1 is the systematic bit and g2 and g3 are the other transmitted bits.

8. A method of communicating data as claimed in claim 1 wherein the trellis code is communicated with interleaved Reed-Solomon coding.

9. A method of communicating data as claimed in claim 1 wherein the trellis code is communicated with interleaved Reed-Solomon coding in punctured mode.

10. An encoder for encoding data for communication by a method as claimed in claim 1 arranged to encode the data using a star 8-Quadrature Amplitude Modulation scheme with a systematic trellis code in which the systematic bit corresponds to the amplitude of the transmitted signal.

11. A decoder for decoding data communicated by a method as claimed in claim 1 arranged to decode received data which has a star 8-Quadrature Amplitude Modulation scheme with a systematic trellis code in which the systematic bit corresponds to the amplitude of the transmitted signal.

12. A non-coherent receiver including a decoder according to claim 11 and arranged to detect the systematic code bit using energy detection.

13. A method of communicating data in which the data is transmitted using a star 8-Quadrature Amplitude Modulation scheme, the data being encoded using a Reed-Solomon coding without convolutional coding nor trellis coding.

14. An encoder for encoding data for communication by a method as claimed in claim 13 arranged to encode the data using a star 8-Quadrature Amplitude Modulation scheme with a Reed-Solomon coding without convolutional coding nor trellis coding.

15. A decoder for decoding data communicated by a method as claimed in claim 13 arranged to decode received data which has a star 8-Quadrature Amplitude Modulation scheme with a Reed-Solomon coding without convolutional coding nor trellis coding.