MULTIPLE INPUT MULTIPLE OUTPUT RADIO COMMUNICATION SYSTEM WITH PRE-EQUALIZER AND COMMUNICATION METHOD THEREOF

1 . A transmitter of a Multiple Input Multiple Output (MIMO) radio communication system, the transmitter comprising:

a Space Time Block Coding (STBC) encoding unit receiving a transmit data and performing an STBC encoding to output a plurality of encoded signals;

a pre-equalization unit performing a pre-equalization process on the plurality of encoded signals, which are transmitted from the STBC encoding unit, to output a plurality of transmit signals; and

a transmit antenna unit transmitting the plurality of transmit signals at different time.

2 . The transmitter of claim 1 , wherein the pre-equalization unit performs the pre-equalization process using a channel response received and obtained upon uplink.

3 . The transmitter of claim 1 , wherein the pre-equalization unit generates the plurality of transmit signals using a normalizing factor for making a transmission power constant.

4 . The transmitter of claim 1 , wherein the transmit antenna unit comprises two or more transmit antennas and transmits the plurality of transmit signals through the different transmit antennas at the different time.

5 . The transmitter of claim 1 , wherein the pre-equalization unit comprises:

a pre-equalizer performing the pre-equalization process on the plurality of encoded signals; and

a channel estimator transmitting a channel response, which is generated using information received upon uplink, to the pre-equalizer in order to enable the channel response to be used in the pre-equalization.

6 . The transmitter of claim 1 , wherein the pre-equalization unit generates the plurality of transmit signals using a normalizing factor for making a transmission power constant.

7 . A receiver of a Multiple Input Multiple Output (MIMO) radio communication system, the receiver comprising:

a receive antenna unit comprising two or more antennas and receiving a plurality of signals through the two or more antennas at different time;

a Space Time Block Coding (STBC) decoding unit performing an STBC decoding on the plurality of received signals to output a plurality of receive data signals; and

a data output unit outputting contents of the receive data signals.

8 . The receiver of claim 7 , wherein the STBC decoding unit outputs the receive data signals by performing the STBC decoding on the plurality of received signals by using an arithmetic operation without channel estimation.

9 . A transmitting method of a Multiple Input Multiple Output (MIMO) radio communication system, the transmitting method comprising:

generating a plurality of encoded signals with respect to a transmit data;

performing a pre-equalization process on the plurality of encoded signals to output a plurality of transmit signals; and

transmitting the plurality of transmit signals at different time.

10 . The transmitting method of claim 9 , wherein the generating of the plurality of transmit signals comprises:

confirming a channel response obtained upon uplink; and

performing the pre-equalization process using the channel response.

11 . The transmitting method of claim 9 , wherein the plurality of transmit signals are generated using a normalizing factor for making a transmission power constant.

12 . The transmitting method of claim 9 , wherein the transmitting of the plurality of transmit signals comprises:

allocating a plurality of transmit antennas to the plurality of transmit signals, respectively; and

transmitting the plurality of transmit signals through the plurality of transmit antennas at different time.

13 . A receiving method of a Multiple Input Multiple Output (MIMO) radio communication system, the receiving method comprising:

receiving a plurality of receive signals through a plurality of antennas at different time;

generating a receive data signal by performing a Space Time Block Coding (STBC) decoding on the plurality of received signals by using an arithmetic operation; and

outputting the receive data.

14 . The receiving method of claim 13 , wherein the receive data signal is generated using an arithmetic operation on the plurality of receive signals without channel estimation.