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Determination of transmitter distortion

  • US 6,731,914 B2
  • Filed: 02/22/2001
  • Issued: 05/04/2004
  • Est. Priority Date: 11/02/1998
  • Status: Expired due to Fees
First Claim
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1. A symbol generator for generating a test symbol sequence S(n) for measuring nonlinear distortion of a transmitter under test, characterized by:

  • a shift register for generating a set of bit sequences; and

    a symbol mapper for mapping the bit sequences to the test symbol sequence;

    wherein the shift register is further characterized by;

    a linear feedback shift register having eleven delay elements to implement the generator polynomial;

    g(s)=1+x9+x11 in GF(2), wherein GF(2) denotes the Galois field of 2, the generator polynomial outputting a pseudo-random bit sequence x0n generated according to g(x), with subscript n denoting a time index, the linear feedback shift register being updated once per symbol period and at each symbol period the linear feedback shift register being advanced by one bit and one new bit of sequence x0n being generated, the linear feedback register providing two additional pseudo-random bit sequences x1n and x2n being generated by the linear combinations of time delayed versions of x0n, wherein;

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