Efficient signal enhancement scheme for adaptive antenna arrays in Nakagami multipath fading
Kyungseok Kim, Ki-Cheol Tae · 2003
An efficient signal enhancement scheme for an adaptive antenna array under the Nakagami fading channel is proposed. The proposed signal enhancement scheme is a modified linear signal estimator with the Toeplitz matrix approximation (TMA) method. The underlying principle of the proposed signal enhancement scheme is to reduce the noise component using not only the Lagrangian method of the constrained minimization but also a signal-plus-noise subspace method. The TMA is also used because of its theoretical noise-free signal property. These functions greatly enhance the performance of an adaptive antenna array by removing the all undesired noise effects from the post-correlation received signal. The proposed signal enhancement scheme is applied with the Wiener maximal ratio combining (MRC) method which has been widely used as the conventional adaptive antenna array. Several computer simulation examples are provided for illustrating the effectiveness of the proposed scheme.