Apparatus and method for interference cancellation in a broadband wireless communication system

A receiving apparatus in a wireless communication system, the apparatus comprising:

• an estimator for estimating a channel of an interference signal by performing a Joint Channel Estimation (JCE) in a set size unit;
• a creator for creating an interference signal using the channel estimation value of the interference signal and decoded data of a corresponding interference burst;
• an interference canceller for, depending on the JCE result, at least one of outputting an interference-canceled signal by canceling the created interference signal from a received signal and directly outputting the received signal;
• and
• a data restoration unit for calculating a noise variance value by adding a mean noise power value for the interference-canceled signal to at least one mean interference power value acquired through the JCE, and, upon receiving an interference-noncanceled signal from the interference canceller, and for creating LLR data by demodulating the interference-noncanceled signal using the noise variance value.

A receiving method in a wireless communication system, the method comprising:

• estimating channels of a desired signal and at least one interference signal by performing a Joint Channel Estimation (JCE) in a set size unit;
• estimating noise using the channel estimation value of the desired signal and the channel estimation value of the at least one interference signal;
• calculating a mean interference power of each interference signal using the channel estimation value of the interference signal and calculating a mean noise power using the noise estimation value;
• channel-compensating received burst data using the channel estimation value of the desired signal;
• calculating a noise variance value by adding the mean noise power to the at least one mean interference power;
• and
• demodulating the channel-compensated data using the noise variance value to creates Log Likelihood Ratio (LLR) data.

A receiving method in a wireless communication system, the method comprising:

• estimating a channel of an interference sector by performing a Joint Channel Estimation (JCE) in a set size unit;
• creating an interference signal using the channel estimation value of the interference sector and decoded data of a corresponding interfering sector;
• switching an interference cancellation operation for a received signal depending on the outcome of the JCE;
• calculating a noise variance value by adding a mean noise power value for an interference-canceled signal to at least one mean interference power value acquired through the JCE;
• and
• decoding the received signal using the noise variance value to create LLR data for which the interference cancellation operation is switched off.