On the performance of CMA array in spatial macro-diversity antennas

The constant modulus algorithm (CMA) array has been shown to be an effective blind equalization tool in mobile communications. In spatial micro-diversity, where the antennas are closely spaced, the performance of CMA in eliminating the co-channel interference and restoring the constant modulus property of the desired signal has been extensively evaluated. However, in macro-cells, the antenna elements are typically separated several wavelengths apart. In this case, the scattering signals would present low correlation across the array sensor. In this paper, the properties of CMA under spatial macro-diversity scenarios are delineated. A modified Jakes model is used to simulate partial spatial correlation of the signal across the array. A comparison between CMA and the switch diversity technique under correlated signal fadings in macro-cells is presented.