抄録
This letter proposes an interference cancellation method for Multiple Input Multiple Output - Orthogonal Frequency Division Multiplexing (MIMO-OFDM) adaptive array, which utilizes periodical preamble signals. A short preamble signal of IEEE802.11 based OFDM signal are mapped in only twelve subcarriers in a frequency domain and the signal in a time domain is transformed by Inverse Fast Fourier Transform (IFFT) at the transmitter. At the receiver site, the subcarriers at which only interference arrive can be found by employing Fast Fourier Transform (FFT). The propose method utilize this feature and efficiently reduce the interference by utilizing the null subcarriers which is not mapped in the short preamble signal. By a computer simulation, it is shown that the proposed method with the smaller number of training signals can obtain same Bit Error Rate (BER) performance compared to the conventional Minimum Mean Square Error (MMSE) adaptive array.
