Local signal generator for wireless telecommunication and local signal generation method and radio access system of wireless telecommunication system using the same

A method for generating a local signal for a wireless telecommunication using a scheme of Time Division Duplex (TDD), the method comprising the steps of:

• (a) converting an Intermediate Frequency (IF) signal having the Intermediate Frequency between the baseband and the Radio Frequency (RF) into an IF local signal;
• (b) distributing the IF local signal into an IF local signal for transmission and an IF local signal for reception;
• and
• (C) outputting the IF local signal for transmission to a Transmission (Tx) path during a Down Link (DL) in a TDD period, and outputting the IF local signal for reception to at least two Receive (Rx) paths during an Up Link (UL) in the TDD period.

A method for generating a local signal for a wireless telecommunication using a scheme of Time Division Duplex (TDD), the method comprising the steps of:

• (a) converting a Radio Frequency (RF) signal into an RF local signal;
• (b) switching an RF local signal for reception to a receive path during an Up Link (UL), and switching the RF local signal for transmission to a transmission path during a Down Link (DL);
• and
• (c) distributing the RF local signal for reception to at least two Receive (Rx) paths during the UL, and outputting the RF local signal for transmission to a Transmission (Tx) path during the DL.

A method for generating a local signal for wireless telecommunications of a Radio Access Station (RAS) system using a scheme of Time Division Duplex (TDD) using the same transmission/receive frequency, and having an Up Link (UL) in which the RAS receives data and a Down Link (DL) in which the RAS transmits data, the method comprising the steps of:

• (a) converting, by a Radio Frequency (RF) synthesizer, an RF signal into an RF local signal in response to a synchronizing signal of the RAS system, and converting, by an Intermediate Frequency (IF) synthesizer, an IF signal having the Intermediate Frequency between the baseband and the Radio Frequency into an IF local signal, wherein the conversion of the RF signal into the RF local signal and the conversion of the IF signal into the IF local signal are implemented by the same local unit;
• (b) switching, by a switch, the RF local signal to a receive path, and outputting the IF local signal to a receive path by way of a distributor during the UL in a TDD period, and switching the RF local signal to a transmission path, and outputting the IF local signal through a transmission path by way of a distributor during the DL in the TDD period;
• (C) distributing, by a distributor, the RF local signal and the IF local signal respectively outputted to at least two receive paths during the UL in the TDD period, and outputting the RF local signal and the IF local signal respectively outputted to a transmission path during the DL in the TDD period.

A Radio Access Station (RAS) in a wireless telecommunication system using a scheme of Time Division Duplex (TDD), the RAS comprising:

• an antenna for transmitting/receiving a Radio Frequency (RF) signal to/from a Portable Subscriber Station (PSS);
• a front-end for processing transmission/receive signals transmitted/received via the antenna, and transmitting the receive signal to a transceiver;
• the transceiver for generating an Intermediate Frequency (IF) local signal and an RF local signal, and up/down-converting the RF local signal and an the IF local signal, respectively, by an apparatus for generating a local signal which distributing, by a distributor, the generated IF local signal into an IF local signal for transmission and an IF local signal for reception, and outputting, by a switch, the RF local signal for transmission and the IF local signal for reception;
• an amplifier for amplifying the transmission signal provided from the transceiver, and transmitting the amplified signal to the front-end;
• and
• a channel control unit for controlling the transceiver, checking transmission/reception signals, and controlling a transmission channel.