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The Constant Modulus Algorithm (CMA) enjoys widespread popularity as methods for blind beamforming and equalization of communication signals.CMA is straightforward to implement,robust,and computationally of moderate complexity. Furthermore, it is insensitive to array imperfection.In an environment containing multiple constant modulus signals,the signal extracted by CMA depends on the relative power of the incident signals. According previous works,the CMA is prone to capture the strongest Constant Modulus(CM) signal at the output of the array.In this paper,we show that the weak CM signal could be recovered by CMA 1-2 and CMA 2-1 when setting special step-size.Simulation examples confirm our remarks.
The Constant Modulus Algorithm (CMA) enjoys broad popularity as methods for blind beamforming and equalization of communication signals. CMA is straightforward to implement, robust, and computationally of moderate complexity. Furthermore, it is insensitive to array imperfection. An environment containing multiple constant Modulation signals, the signal extracted by CMA depends on the relative power of the incident signals. According to previous works, the CMA is prone to capture the strongest Constant Modulus (CM) signal at the output of the array. In this paper, we show that the weak CM signal could be recovered by CMA 1-2 and CMA 2-1 when setting special step-size.Simulation examples confirm our remarks.