| 摘要 |
PROBLEM TO BE SOLVED: To prevent inter-symbol or inter-chip interference caused by the spread of delay at a radio channel. SOLUTION: A received spread spectrum code pulse modulated signal is separated into I signal and Q signal by a demodulator 520 and respectively impressed through correlators 540 and 545 to complex channel controllers 550 and 555. The I and Q signal, for which the spread of delay is compensated by the controllers 550 and 555, are analyzed for identifying the code and position of main lobe. After sampling and storage due to eight-position registers 560 and 565 and a discrimination device 570 forming a temporary symbol estimator, the code and position of main lobe are selected from a maximum amplitude value and translated into two eight-bit signals. Concerning a circuit provided with these registers 560 and 565 and discriminator 570, weight is allocated to respective enable symbol values while considering a cross rail or bias effect caused by residual coupling between signals on an orthogonal channel belonging to a prescribed symbol period. |
