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Double side band-quadrature carrier modulation signal structures

  • US 4,271,527 A
  • Filed: 08/31/1979
  • Issued: 06/02/1981
  • Est. Priority Date: 08/31/1979
  • Status: Expired due to Term
First Claim
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1. A method for mapping in the complex plane the point constellation of a double side band-quadrature carrier modulation system wherein each symbol conveys M bits (M being an integer) of information comprising the steps of:

  • a. Mapping the points in a constellation composed of N×

    N points (N being an integer) having 90°

    symmetry about the origin;

    b. Omitting any point appearing at the origin;

    c. Omitting any points in excess of 2M ; and

    d. Relocating the point in each quadrant further spaced from the origin than any other point to a point closer to the origin than it previously occupied.

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