It is well known that adaptive beamforming methods are susceptible to performance losses in the presence of model mismatches, especially when the training sample is contaminated by the desired signal. Here, in order to thoroughly remove the desired signal from the sample covariance matrix, the authors propose an iterative adaptive approach based on angular sector reconstruction algorithm to reconstruct the interference‐plus‐noise covariance matrix (INCM). Traditional INCM reconstruction methods are based on the Capon spectrum estimator to obtain the spatial power spectrum. However, the Capon spectrum cannot provide accurate power estimates because it is known to be sensitive to the array calibration error. Inspired by the excellent behaviour of the IAA algorithm, the authors use the IAA spectrum to obtain accurate power estimates which can be used to reconstruct the interference covariance matrix and revise the desired signal steering vector. Simulation results show that the performance of the proposed robust adaptive beamformer outperforms previous works and the output signal‐to‐interference‐plus‐noise ratios are close to the optimal values.

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1Irregular Shaped Voltage Islands (ISVI) can achieve much better power savings in multiple supply voltage (MSV) technology. This paper proposes a simulated annealing (SA) based floorplanning method with ISVI generation using a Hazard and Heal strategy. In each perturbation of SA, a randomly chosen block is removed from floorplan and then inserted back to a proper position, to join certain voltage island. The solution space for every iteration is O(n 2 k vi ), where n is block number and k vi is voltage island number. Every position with voltage island assignment is evaluated by a linear combination of chip area, wire length, power and voltage island cost. To avoid timing-consuming evaluation of O(n 2 k vi ) possibilities, we propose a fast Hazard method to construct ISVI by skipping lots of distant voltage island candidates while occasionally accepting seldom-emerged illegal (non-contiguous) candidates. To resolve the seldom-emerged non-contiguous voltage islands, a detailed Heal method is applied in each temperature. Experimental results show the proposed method is effective and efficient compared with the latest works.