Apparatus for channel equalization using multi antenna and method thereof

A channel equalizing method using a multi antenna, comprising the steps of:

• receiving digital transmission signals using a plurality of antennas, respectively;
• computing an initial equalizer coefficient value to maximize a signal to noise ratio by presuming channel impulse responses from the signals received via a plurality of the antennas and by receiving a frequency domain channel impulse response value transformed from each of the transport channel impulse responses;
• performing channel equalization on the received signal using the signal transformed into the frequency domain from the received signal and the initial coefficient value;
• by keeping performing coefficient update by being fed back with the channel-equalized signal, performing channel equalization using the updated coefficient value and the received signal;
• adding outputted signals equalized in the frequency domain together;
• and
• transforming the added signal into a time domain.

A channel equalizing apparatus using a multi antenna, comprising:

• a plurality of frequency domain equalizers using a plurality of antennas to receive signals transmitted from a digital transceiver system, a plurality of the frequency domain equalizers equalizing the signals received via a plurality of the antennas in a frequency domain to output, respectively;
• an adder adding the frequency-domain-equalized signals outputted from a plurality of the frequency domain equalizers together;
• an IFFT unit transforming an output signal of the adder into a time domain;
• a noise predictor predicting a noise amplified in an equalizing process;
• and
• a subtracter generating a final output signal by removing the noise predicted by the noise predictor from the time-domain-transformed signal from the equalized signal.

A channel equalizing apparatus using a multi antenna, comprising:

• a plurality of antennas receiving signals transmitted from a digital transceiver system;
• an initial coefficient calculator computing an initial equalizer coefficient value to maximize a signal to noise ratio by presuming channel impulse responses from the signals received via a plurality of the antennas and by receiving a frequency domain channel impulse response value transformed from each of the channel impulse responses;
• a plurality of channel equalizers performing channel equalization on the received signal using the signal transformed into the frequency domain from the received signal and the initial coefficient value, a plurality of the channel equalizers keeping performing coefficient update by being fed back with the channel-equalized signal and performing channel equalization using the updated coefficient value and the received signal;
• an adder adding outputted signals equalized by a plurality of the frequency domain equalizers in the frequency domain together;
• and
• an IFFT unit transforming an output signal of the adder into a time domain.