Rotationally invariant non-coherent burst coding mapping function

• US 8,099,647 B1
• Filed: 02/17/2010
• Issued: 01/17/2012
• 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:
  US12/707,304
• Time in Patent Office: 699 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 using a phase invariant non-coherent burst coding mapping function, the method comprising:

selecting a weight 12 code word;

generating a code list for all possible codes for the selected weight 12 code word;

cycling through the codes in the code list by;

selecting a code from the code list;

generating codes for all possible rotational phases for the selected code;

identifying conflicting codes that match the generated codes for the rotational phases of the selected code; and

blacklisting one of the selected code and the identified conflicting codes;

storing the mapping of data values for code words that are non-blacklisted; and

using the mapping to generate code words from data.

2. The method of claim 1, wherein the mapping of data values is stored in at least one of:

a look-up table, a generator matrix, a memory, and a data mapper circuit.