Nova Patents
EP0503632A2

Delay detector for QPSK signals.

Abstract

A base-band delayed detector has an operation circuit (1 - 59) for performing a delayed detecting operation with respect to an input signal, the operation circuit (1 - 59) outputting an altered signal having a predetermined symbol rate. The base-band delayed detector includes a clock generator (31, 33) for generating a clock signal having a frequency twice as large as the symbol rate, the clock signal being used, as a timing signal, in the operation circuit (1 -59), a synchronizing circuit (2, 32, 35) for synchronising the clock signal with the altered signal output from the operation circuit; and a data determination circuit (60, 61, 62) for obtaining output data from the altered signal at a predetermined timing defined based on the clock signal synchronized with the altered signal.

EP0503632A2, drawing sheet 1
Sheet 1 of 35

Term

Term ended

Projected expiry passed 12 March 2012, 14.5 years ago.

  1. Priority
  2. Filed
  3. Published
  4. Projected expiry
  5. Today

12 claims: 1 independent, 11 dependent

  1. 1
    A base-band delayed detector having operation means (51 - 59) for performing a delayed detecting operation with respect to an input signal in synchronism with a clock signal, said operation means (51 - 59) outputting an altered signal having a predetermined symbol rate, characterized in that said base-band delayed detector comprises;clock generation means (31, 33) for generating a clock signal having a frequency 2n times as large as the symbol rate, said clock signal being used as a timing signal in said operation means (1 - 59);synchronizing means (2, 32, 35), coupled to said operation means and said clock generation means, for synchronizing said clock signal with the altered signal output from said operation means (1 - 59);and    data determination means (60, 61, 62), coupled to said synchronizing means (2, 32, 35), for obtaining output data from said altered signal at a predetermined timing defined based on said clock signal synchronized with said altered signal.