Interference suppressing method and device in dynamic frequency spectrum access system

A secondary device in a secondary system, comprising one or more processors configured to:

• determine position information of the secondary device so that a spectrum management device determines a weighting factor for the secondary device based on the position information,
• wherein it is determined whether the secondary device is capable of performing first-stage precoding, a transmission power for the secondary device is determined based on a result of the determination, and a higher transmission power is determined for the secondary device in a case where the secondary device is capable of performing the first-stage precoding than in a case where the specific secondary device is not capable of performing the first-stage precoding,
• the one or more processors further configured to obtain the determined transmission power;
• wherein the one or more processors are further configured to perform second-stage precoding in which the weighting factor determined by the spectrum management device is used to adjust estimation of power leaked from the secondary device to other secondary devices;
• and
• wherein the one or more processors are further configured to perform the first-stage precoding before performing the second-stage precoding in the case where the secondary device is capable of performing the first-stage precoding.

A method for suppressing interference in a communication system, the method comprising:

• transmitting position information of each of secondary devices to a spectrum management device;
• determining, by the spectrum management device, a weighting factor for a specific secondary device based on the received position information;
• performing second-stage precoding in which the weighting factor is used to adjust estimation of power leaked from the specific secondary device to other secondary devices;
• determining whether the specific secondary device is capable of performing first-stage precoding;
• and
• determining a transmission power for the specific secondary device based on a result of the determination,
• wherein a higher transmission power is determined for the specific secondary device in a case where the specific secondary device is capable of performing the first-stage precoding than in a case where the specific secondary device is not capable of performing the first-stage precoding.