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چکیده
Abstract— Orthogonal frequency division multiplexing (OFDM) has been attracting much attention as the next generation wireless transmission technique. In a cellular network, the same carrier frequency is reused at different base stations and therefore, cochannel interference (CCI) limits the transmission performance. By suppressing the CCI, the uplink transmission performance can be improved and the link capacity can be increased as well. Adaptive antenna array is one of the well-known techniques for suppressing the CCI. Adaptive antenna array for OFDM is classified into 2 types: post-fast Fourier transform (FFT) type and pre-FFT type. In this paper, the array weight based on the CCI power minimization criterion is theoretically derived using the Lagrange multiplier method to show that pre-FFT type and post-FFT type adaptive antenna array are equivalent assuming the asynchronous CCI from other cells. It is also shown that the same array weight can be used for all subcarriers in the case of post-FFT type. The array weight is obtained by implementing a practical normalized LMS algorithm. The weight convergence rate is evaluated by computer simulation.
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