| 摘要 |
PURPOSE:To improve the 2nd equalization capability limit by applying logic operation to a control signal of each tap at an imaginary part in a transversal equalizer among a quadrant discrimination output, a position discrimination output and an area discrimination output. CONSTITUTION:A 64QAM wave input signal enters a transversal filter 3 comprising a delay circuit and a weight circuit, a control signal from weight control circuits 2R, 2L is received to reject an inter-code interference of the input signal and an output signal without inter-code interference is obtained at the output of a demodulator 4. A real part weight control circuit 2R receives quadrant discrimination signals D1p, D1q and error signals Ep, Eq as the input to output weight control signals R+ or -1, R+ or -2. An imaginary part weight control circuit 2I receives quadrant discrimination signals D1p, D1q, a position discrimination signal S1, and an area discrimination signal S2 and error signals Ep, Eq to send weight control signals I+ or -1, I+ or -2. |
