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摘要
In this paper, we propose adaptive beamforming schemes for orthogonal frequency-division multiplexing (OFDM) communication systems. After applying the discrete-Fourier-transform operation to the output of. each antenna, one estimates the signal-plus-interference spatial correlation matrix by selecting the samples at "nonzero-valued" subcarriers and the interference-alone spatial correlation matrix by choosing those samples at "zero-valued" subcarriers (also known as virtual carriers). The beamforming weight vector is the "largest" generalized eigenvector of the resulting matrix pencil, wherein the solution is computed in a batch fashion. By using a limited number of samples, the proposed scheme offers competitive performance compared with that of the scheme using optimal beamforming weight vectors that are calculated for each subcarrier under small-angular-spread scenarios. The adaptive solution for calculating the beamforming weight vector is also derived. The proposed schemes are shown to be suitable in scenarios of narrow angular spread with exponential power delay profile. The simulations that are presented here employ the OFDM signal model to illustrate the efficacy of the proposed algorithms.
- 出版日期2007-7
- 单位中央民族大学
