×

Method of equalization in digital mobile communication with improved tracking ability

  • US 5,274,670 A
  • Filed: 02/28/1992
  • Issued: 12/28/1993
  • Est. Priority Date: 03/01/1991
  • Status: Expired due to Term
First Claim
Patent Images

1. A method of equalization, comprising the steps of:

  • obtaining a signal sequence from received signals by applying frequency transformation and sampling;

    carrying out a forward equalization of the signal sequence to obtain a forward equalization output in which the signal sequence is equalized in an order in which the received signals are received;

    calculating a forward evaluation function indicating a reliability of the forward equalization by using the signal sequence;

    carrying out a backward equalization of the signal sequence to obtain a backward equalization output in which the signal sequence is equalized in an order opposite to that in which the received signals are received;

    calculating a backward evaluation function indicating a reliability of the backward equalization by using the signal sequence; and

    obtaining a final equalization output by selecting for each bit of the signal sequence one of the forward equalization output and the backward equalization output for which the reliability indicated by a corresponding one of the forward evaluation function and the backward evaluation function is higher as the final equalization output for each bit, such that the final equalization output is given as a composition of those parts of the forward equalization output for which the reliability indicated by the forward evaluation function is higher than the reliability of the backward equalization output indicated by the backward evaluation function and those parts of the backward equalization output for which the reliability indicated by the backward evaluation function is higher than the reliability of the forward equalization output indicated by the forward evaluation function.

View all claims
  • 3 Assignments
Timeline View
Assignment View
    ×
    ×