| 摘要 |
PURPOSE:To prevent inter-cross polarization interference compensating capacity from being lowered and to operate a device at code speed by compensating delay difference between a main polarization and a cross polarization being generated due to fading on a transmission path, etc., adaptively and providing a phase control circuit, etc. CONSTITUTION:A cross polarization demodulation circuit 41 identifies and demodulates the signal of inputted cross polarization, and a clock generation circuit 42 generates a clock to be used in the decision of the timing of signal identification at the circuit 41. Also, the phase control circuit 45 judges the direction of the phase of a timing clock to obtain the optimum interference compensation effect by adjusting in a direction to lead or lag based on relation between the error of a main polarization demodulation signal before applying interference compensation and the inclination of a compensation signal. Then, the phase of the timing clock supplied from the circuit 42 to the circuit 41 is adjusted in a direction of judged result. In such a way, the compensation signal is generated at a compensation signal generation circuit 43 based on the demodulation signal whose identification timing is set at the optimum level, and the inter-cross polarization interference compensation capacity can be prevented from being lowered by suppressing an interference signal, in the main polarization by using the compensation signal, and also, the device can be operated at the code speed. |
