Rotationally invariant non-coherent burst coding and decoding

• US 8,095,849 B1
• Filed: 02/17/2010
• Issued: 01/10/2012
• Est. Priority Date: 09/25/2006
• Status: Active Grant

• Current Assignee: Alfred E. Mann Foundation For Scientific Research
• Original Assignee: Alfred E. Mann Foundation For Scientific Research
• Inventors: Karr, Lawrence J., Hess, Phillip B.
• Primary Examiner(s): Torres, Joseph D
• Application Number:
  US12/706,972
• Time in Patent Office: 692 Days
• Field of Search: 714/758, 714/781
• US Class Current: 714/758
• CPC Class Codes: H03M 13/1505 Golay Codes
• CPC Class Codes: H03M 13/251 with block coding
• CPC Class Codes: H04J 13/00 Code division multiplex systems for frequency hopping H04B1/713
• CPC Class Codes: H04J 13/10 Code generation
• CPC Class Codes: H04J 13/16 Code allocation
• CPC Class Codes: H04L 1/0042 Encoding specially adapted to other signal generation operation, e.g. in order to reduce transmit distortions, jitter, or to improve signal shape H04L1/0067 takes precedence
• CPC Class Codes: H04L 1/0045 Arrangements at the receiver end
• CPC Class Codes: H04L 1/0058 Block-coded modulation

Abstract

An apparatus, system and method can be arranged for coding and/or decoding with a phase invariant coding scheme that is useful for short burst signaling devices. 10-bit data is mapped into a 12-bit data with a non-coherent burst code mapper. A parity generator creates a 12-bit parity data to form a 24-bit extended binary Golay code from the 12-bit data. The values for selected bit fields in the 12-bit data and 12-bit parity data are swapped to generate I and Q data such that sensitivity to changes in rotational phase is removed. I and Q data can be used by a transmitter to transmit a rotationally-invariant signal. On receipt, I and Q signals can be recovered, reverse swapped to generate the parity and data signals, and remapped to recover the transmitted 10-bit data. The receiver can also be arranged to use a soft decoding method for improved signal integrity.

Claims

1. A method for decoding information from a signal transmission that is encoded with a phase invariant non-coherent burst coding scheme, the method comprising:

generating a plurality of pairs of 12-bit data and 12-bit parity data from a plurality of corresponding 10-bit data, wherein each 12-bit data corresponds to a mapping between a 10-bit data space and a 12-bit data space based on a 24-bit weight 12 template code, and wherein each 12-bit parity corresponds to an extended binary Golay code that is associated with the respective 12-bit data;

correlating the plurality of pairs of 12-bit data and 12-bit parity with a series of samples associated with the signal transmission, wherein the series of samples include a combination of signals and noise associated with the signal transmission; and

identifying a specific one of the plurality of 10-bit data that is associated with the highest correlation of the 12-bit data and the 12-bit parity with the series of samples associated with the signal transmission such that the specific one of the plurality of 10-bit data corresponds to the decoded information.

2. The method of claim 1, further comprising:

evaluating a phase angle associated with the correlation to identify additional 2-bit data that is encoded in rotational phase of the signal transmission.